Synthesis And Self Assembly Of Molecular Shape Amphiphiles

Download Synthesis And Self Assembly Of Molecular Shape Amphiphiles full books in PDF, epub, and Kindle. Read online Synthesis And Self Assembly Of Molecular Shape Amphiphiles ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!

Synthesis and Self-assembly of Molecular Shape Amphiphiles

Author : Xinfei Yu
Publisher :
ISBN 13 :
Total Pages : 176 pages
Book Rating : 4.:/5 (124 download)

DOWNLOAD NOW!

Book Synopsis Synthesis and Self-assembly of Molecular Shape Amphiphiles by : Xinfei Yu

Download or read book Synthesis and Self-assembly of Molecular Shape Amphiphiles written by Xinfei Yu and published by . This book was released on 2012 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer-tethered nanoparticles are one kind of shape amphiphiles, which are geometric objects with distinct shapes and chemical functionalities. Hydrophilic polyhedral oligomeric silsesquioxane (POSS) and fullerene (C60) are utilized as model nanoparticles while hydrophobic polystyrene (PS) chains are used as tetheres to construct model molecular shape amphiphiles.PS-tethered carboxylic acid functionalized POSS with different PS chain lengths, PSN-APOSS, were synthesized by combining anionic polymerization and thiol-ene "click" chemistry. PSN-APOSS formed micelles in selective solvents which were studied by transmission electron microscopy (TEM) and light scattering (LS) experiments. The effects of PS chain length, common solvents, and solvent/nonsolvent ratio on the micellar morphologies of PSN-APOSS have been investigated. The multivalent interactions between APOSS cages with fixed shape and volume made the self-assembly behaviors of PSN-APOSS distinct from those of traditional amphiphilic block copolymers. The self-assembled ordered structures of PSN-APOSS in the condensed state were studied by small angle X-ray scattering (SAXS) and TEM experiments. The ordered structures changed from lamellae, to hexagonal packed cylinders, and to body-centered cubic spheres as increasing PS chain length. The size of self-assembled structure is around 10 nm, which is challenging for traditional diblock copolymers. 1,3-Dipolar Huisgen cycloaddition of alkyne-azide "click" reaction was utilized to synthesize the PS mono- and di-tethered hydrophilic C60 (PSN-AC60 and 2PSN-AC60) with well-controlled topology and various PS chain lengths. Self-assembled aggregates (micelles and colloidal particles) of these shape amphiphiles were prepared in solutions and studied by TEM and LS experiments. A systematic morphological phase diagram for PSN-AC60 was obtained depending on the molecular concentration, PS chain length, and solvent composition. Concentration-sensitive self-assembled morphologies were ascribed to multivalent interactions between AC60 nanoparticles as well as the PS chain stretching. The topology effect on the formation of both micelles and colloidal particles was revealed by PS44-AC60 and 2PS2323-AC60, which have identical PS weight fractions. These giant molecular shape amphiphiles thus represent a novel class of amphiphilic molecules that have not been systematically explored beyond the traditional surfactants and block copolymers systems, which provide a new platform for understanding supramolecular self-assemblies of amphiphilic molecules in solution and in condensed state.

Giant Molecular Shape Amphiphiles Based on Polyhedral Oligomeric Silsesquioxanes: Molecular Design, "click" Synthesis and Self-assembly

Download Giant Molecular Shape Amphiphiles Based on Polyhedral Oligomeric Silsesquioxanes: Molecular Design,

Author : Yiwen Li (Chemist)
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (134 download)

DOWNLOAD NOW!

Book Synopsis Giant Molecular Shape Amphiphiles Based on Polyhedral Oligomeric Silsesquioxanes: Molecular Design, "click" Synthesis and Self-assembly by : Yiwen Li (Chemist)

Download or read book Giant Molecular Shape Amphiphiles Based on Polyhedral Oligomeric Silsesquioxanes: Molecular Design, "click" Synthesis and Self-assembly written by Yiwen Li (Chemist) and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The emergence of giant molecular shape amphiphiles as important building blocks for "bottom-up" nanofabrication has sparked substantial interest because conformation rigidity and shape anisotropy provide additional factors in directing self-assembly into various hierarchical structures. It has been found that giant molecular shape amphiphiles are able to self-assemble into diverse hierarchical supramolecular structures, similar to those observed in small molecular amphiphiles and block copolymers; yet this class of amphiphiles possesses distinct differences with various molecular shape, symmetries, and topologies. The purpose of this research is to develop several kinds of Polyhedral Oligomeric Silsesquioxanes (POSS)-based giant molecular shape amphiphiles with precisely defined molecular structures and functionalities by using thiol-ene "click" chemistry and other precise transformations. To achieve this, a library of monofunctional vinyl POSS building blocks with C3V symmetry was firstly prepared in good yields, which could serve as important precursors for further design and synthesis of various POSS-based giant molecular shape amphiphiles. The supramolecualr structures of these assemblies along with the resulting ordered structures are also fully investigated to determine their structure-property relationships. Functionalized POSS cages with different surface chemistry and size were employed to construct dumbbell- and snowman-like molecular Janus particles with various symmetry breakings. The self-assembly of dumbbell-like Janus particles leads to the formation of hierarchically ordered supramolecular structures in bulk. While the ordered packing of POSS within each layer is lost upon heating via undergoing through a first order transition, the bi-layered structure persists up to the decomposition temperature. The driving force of the hierarchical structure formation was attributed to the free energy minimization via the pathway guided by the symmetry breaking in both geometrical sense and chemical sense. Another illustrating example is a series of novel functional POSS heads tethered polymer tails-based giant molecular shape amphiphiles including giant surfactants, lipids, gemini surfactants and miktoarm shape amphiphiles. Diverse architectures of this class of materials have been constructed using sequential "click" chemistry and their self-assembly processes in solution have also been fully discussed. This set of research results not only opens a new pathway for achieving supramolecular self-assemblies of POSS-based giant molecular shape amphiphiles, but also creates unique materials for developing advanced technologies by combining the properties of those hybrid materials.

Synthesis and Self-assembly of Giant Shape Amphiphiles Based on Rod-like Polymers and Precisely Functionalized Fullerenes

Author : Xing Yang (Chemist)
Publisher :
ISBN 13 :
Total Pages : 41 pages
Book Rating : 4.:/5 (128 download)

DOWNLOAD NOW!

Book Synopsis Synthesis and Self-assembly of Giant Shape Amphiphiles Based on Rod-like Polymers and Precisely Functionalized Fullerenes by : Xing Yang (Chemist)

Download or read book Synthesis and Self-assembly of Giant Shape Amphiphiles Based on Rod-like Polymers and Precisely Functionalized Fullerenes written by Xing Yang (Chemist) and published by . This book was released on 2017 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Self-assembly is a hot phenomenon these years that many scientists focus. It is a spontaneously process that components in a system assemble themselves to get a larger functional unit. As the technological advancements increasing, the nanometer scale study of materials is going to become more and more important. A wide variety of materials can be built because of the increasingly complex structures which we get from self-assembled nanoparticles. They can be used for different purposes. One of the self-assembly particle is shape amphiphiles. Shape amphiphiles are based on competing interactions and molecular segments of distinct shapes. While computer simulation has predicted intriguing self-assembly behaviors of shape amphiphiles, experimental investigation is largely unexplored. My research will be focusing on the synthesis of a precisely defined shape amphiphiles based on functionalized fullerenes (C60) and rod-like polyfluorene, where the two different types of functionalized C60 will be placed at the two ends of polyfluorene. Also the assembly of as-synthesized shape amphiphiles in solution has been systematically studied. And a novel 'caterpillar' structure has been observed in TEM image.

Molecular Self-Assembly

Author : Alex Li Dequan
Publisher : CRC Press
ISBN 13 : 9814364312
Total Pages : 464 pages
Book Rating : 4.8/5 (143 download)

DOWNLOAD NOW!

Book Synopsis Molecular Self-Assembly by : Alex Li Dequan

Download or read book Molecular Self-Assembly written by Alex Li Dequan and published by CRC Press. This book was released on 2012-12-20 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past several decades, molecular self-assembly has emerged as one of the main themes in chemistry, biology, and materials science. This book compiles and details cutting-edge research in molecular assemblies ranging from self-organized peptide nanostructures and DNA-chromophore foldamers to supramolecular systems and metal-directed assemblies

Design, Synthesis, and Self-assembly of Giant Shape Amphiphiles with Precisely Controlled Compositions, Interactions, and Geometries Via a Molecular Lego Approach

Download Design, Synthesis, and Self-assembly of Giant Shape Amphiphiles with Precisely Controlled Compositions, Interactions, and Geometries Via a Molecular Lego Approach PDF Online Free

Author : Su Zebin
Publisher :
ISBN 13 :
Total Pages : 194 pages
Book Rating : 4.:/5 (126 download)

DOWNLOAD NOW!

Book Synopsis Design, Synthesis, and Self-assembly of Giant Shape Amphiphiles with Precisely Controlled Compositions, Interactions, and Geometries Via a Molecular Lego Approach by : Su Zebin

Download or read book Design, Synthesis, and Self-assembly of Giant Shape Amphiphiles with Precisely Controlled Compositions, Interactions, and Geometries Via a Molecular Lego Approach written by Su Zebin and published by . This book was released on 2019 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Self-assemblies of soft matters attract broad interests of material scientists since this technology provides versatile designs, relatively low economic cost, convenient route to construct ordered structures at different scales. Tremendous achievements such as various of hierarchical architectures and diverse attracting properties have been achieved by utilizing by self-assemblies of polymer building blocks. However, the challenges of precise controls of designed chemical primary structures, compositions, molecular topology and exact constructions of assembled structures in synthetic polymers are far away from being well addressed. In this dissertation, a novel approach named "molecular Lego approach" has been utilized to construct various well-defined giant molecules, constructed by several types of building blocks, which are nano-sized molecules with precise molecular structure, relatively rigid conformation, and defined molecular symmetry. Three categories of "giant shape amphiphiles" with different driving force for self-assemblies were designed, synthesized, and investigate in detail. First, we designed and synthesized a series of nanosized giant shape amphiphiles in which a triphenylene core is attached to six identical polyhedral oligomeric silsesquioxane (POSS) cages at the periphery through covalent linkers with tunable lengths. Giant shape amphiphiles are molecular building blocks that consist of different moieties of distinct shapes, and engage in competing interactions. The relatively weak [pi-pi] stacking interactions among conjugated aromatic triphenylene cores enable the segregation from peripheric BPOSS cages (POSS functionalized with seven isobutyl groups). Moreover, the tunability of the linker length enables the formation of various ordered spherical phases. Using this platform, we report the experimental observation of the FK Z phase in a soft matter system. Based on these results, we then designed and studied the self-assembly phase transition behaviors of another two series of giant shape amphiphiles. The driving force of these two series of giant shape amphiphiles are only [pi-pi] stacking interactions supplied by triphenylene core, but also hydrogen bonding supplied by the linkers. With systematically tuning the length and rigidity of the linkers, we observed various of phases, including DDQC phase, F-K [sigma] phase, body centered cubic (BCC) phase and HEX phase. Furthermore, we find two sets of giant shape amphiphiles based on benzene-1,3,5-tricarboxamide and cyclotriphosphazene. There is not [pi-pi] stacking interaction between these two types of cores. The driving force for these two sets of samples are mainly hydrogen bonding. These two sets of giant shape amphiphiles self-assemble into BCC phase and A15 phase. These results suggest that the crown shape molecular design is a general way to construct complex spherical phases. These studies suggest that "molecular Lego approach" self-assemblies based on well-defined giant shape amphiphiles can be a powerful platform for achieving unconventional hierarchical structures and pave a new way for supramolecular self-assembly with expected structure, designed properties and function.

Giant Molecular Shape Amphiphiles

Author : Xue-hui Dong
Publisher :
ISBN 13 :
Total Pages : 189 pages
Book Rating : 4.:/5 (129 download)

DOWNLOAD NOW!

Book Synopsis Giant Molecular Shape Amphiphiles by : Xue-hui Dong

Download or read book Giant Molecular Shape Amphiphiles written by Xue-hui Dong and published by . This book was released on 2013 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: The capability of creating ordered patterns in a controlled manner is one of the key requirements to realize future electronic, optical, and magnetic devices and sensors that are composed of such blocks. The `bottom-up' concept has recently gained significant technological importance due the possibility to fabricate nanostructures in a fast, simple, parallel and flexible manner via self-assembly of small building blocks. In this respect, polymers are particularly promising due to their ability to self-assemble into thermodynamically highly stable domains with precisely controlled shapes and domain sizes. Traditional work on this area focuses only on the interactions between amphiphilic blocks, while the geometrical effects are not taken into sufficient consideration. Therefore, it could be of great importance to study assembly and phase behavior when combining traditional polymers with nanoparticles which possess precisely defined structures, unique shapes, and outstanding properties, e.g. fullerene, dendron, and polyhedral oligomeric silsesquioxane (POSS). In this dissertation, precisely defined giant molecular shape amphiphiles with versatile functionalities, diverse architectures, and variable composition were synthesized via a combination of anionic polymerization, controlled/living polymerization and `click' chemistry with these building blocks. The interplay between polymers and nanoparticles brings us with new phenomena which broaden our fundamental knowledge. Three examples, i.e., precisely defined half-stemmed crystals with exact location of defects; asymmetric phase diagram with sub-10 nm feature sizes; and hierarchical structures with highly stretched polymer chains, will be discussed in details to illustrate the importance of the geometrical effects.

Macromolecular Self-Assembly

Author : Laurent Billon
Publisher : John Wiley & Sons
ISBN 13 : 1118887123
Total Pages : 290 pages
Book Rating : 4.1/5 (188 download)

DOWNLOAD NOW!

Book Synopsis Macromolecular Self-Assembly by : Laurent Billon

Download or read book Macromolecular Self-Assembly written by Laurent Billon and published by John Wiley & Sons. This book was released on 2016-09-06 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes techniques of synthesis and self-assembly of macromolecules for developing new materials and improving functionality of existing ones. Because self-assembly emulates how nature creates complex systems, they likely have the best chance at succeeding in real-world biomedical applications. • Employs synthetic chemistry, physical chemistry, and materials science principles and techniques • Emphasizes self-assembly in solutions (particularly, aqueous solutions) and at solid-liquid interfaces • Describes polymer assembly driven by multitude interactions, including solvophobic, electrostatic, and obligatory co-assembly • Illustrates assembly of bio-hybrid macromolecules and applications in biomedical engineering

Polyfluorenes

Author : Ullrich Scherf
Publisher : Springer Science & Business Media
ISBN 13 : 3540687335
Total Pages : 331 pages
Book Rating : 4.5/5 (46 download)

DOWNLOAD NOW!

Book Synopsis Polyfluorenes by : Ullrich Scherf

Download or read book Polyfluorenes written by Ullrich Scherf and published by Springer Science & Business Media. This book was released on 2008-07-29 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: With this collection of short review papers we would like to present a broad overview of research on poly?uorenes and related heteroanalogues over the last two decades. The collection begins with papers on the synthesis of po- ?uorenesandrelatedpolyheteroarenes, thenreportsphotophysicalproperties of this class of conjugated polymers both at the ensemble and the single chain level, continues with a discussion of the rich solid state structures of poly?uorenes, and ?nally switches to device applications (e.g. in OLEDs). In addition, two chapters are devoted to de?ned oligo?uorenesas lowmolecular weight model systems forpoly?uorenes and also to degradation studies. We feel that this up-to-date collection will be very helpful to all polymer chemists and physicists, and will also aid graduate students interested in this fascinating and still growing area of research, since such a compact overview is only now available. All articles are presented by leading scientists in their ?elds, insuring state-of-the-art coverage of all relevant aspects. Together with the body of references this volume is meant to assist researchers in the daily lab routine. Moreover, Advances in Polymer Science, as an established series of high quality review papers, represents a very appropriate platform for our project.Wehopethatthisshortcollectionwillbeofgreatvaluebothforbeg- ners and established researchscientists inthe?eldofpoly?uorene research.

Design, Synthesis, and Self-assembly of Well-defined Hybrid Materials Including Polymer Amphiphiles and Giant Tetrahedra Molecules Based on POSS Nanoparticles

Download Design, Synthesis, and Self-assembly of Well-defined Hybrid Materials Including Polymer Amphiphiles and Giant Tetrahedra Molecules Based on POSS Nanoparticles PDF Online Free

Author : Mingjun Huang
Publisher :
ISBN 13 :
Total Pages : 220 pages
Book Rating : 4.:/5 (14 download)

DOWNLOAD NOW!

Book Synopsis Design, Synthesis, and Self-assembly of Well-defined Hybrid Materials Including Polymer Amphiphiles and Giant Tetrahedra Molecules Based on POSS Nanoparticles by : Mingjun Huang

Download or read book Design, Synthesis, and Self-assembly of Well-defined Hybrid Materials Including Polymer Amphiphiles and Giant Tetrahedra Molecules Based on POSS Nanoparticles written by Mingjun Huang and published by . This book was released on 2015 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Bottom-up" techniques-based self-assembly are always attracting people's interests since this technology provides relatively low economic cost and fast route to construct organized structures at different scales. Considering unprecedented benefits from polymer materials, self-assemblies utilizing polymer building blocks have been extensively studied to achieve diverse hierarchical structures and various attractive properties. However, precise controls of chemical primary structures and compositions and exact constructions of hierarchal ordered structures in synthetic polymers are far from being fully appreciated. In this dissertation, a novel approach has been utilized to construct diverse well-defined nano-building blocks, giant molecules, via conjugating different, and functionalized molecular nanoparticles (MNPs) which are shape- and volume-persistent nano-objects with precise molecular structure and specific symmetry. The representative examples of the three basic categories of giant molecules, "giant polyhedra", "giant surfactants", and "giant shape amphiphiles" were discussed in details. First, a class of precisely defined, nanosized giant tetrahedra was constructed by placing different polyhedral oligomeric silsesquioxane (POSS) molecular nanoparticles at the vertices of a rigid tetrahedral framework. Designed symmetry breaking of these giant tetrahedra introduces accurate positional interactions and results in diverse selectively assembled, highly ordered supramolecular lattices including a Frank-Kasper (FK) A15 phase. The FK and quasicrystal phases are originally identified in metal alloys and only sporadically observed in soft matters. It remains unclear how to correlate their stability with the chemical composition and molecular topology in the self-assembling systems. We then for this purpose designed and studied the self-assembly phase transition sequences of four series of hybrid giant surfactants based on hydrophilic POSS cages tethered with one to four polystyrene (PS) tails. With increasing the number of tails, molecular topological variations not only affect phase boundaries in terms of the PS volume fraction, but also open a window to stabilize supramolecular FK and quasicrystal phases in the spherical phase region, demonstrating the critical role of molecular topology in dictating the formation of unconventional supramolecular lattices of "soft" spherical motifs. The FK A15 phase was even surprisingly observed in the giant shape amphiphile molecule, triphenylene-6BPOSS, which has a disk-like flat triphenylene core connected with six hydrophobic POSS cages by sides. Without conical molecular shape, triphenylene-6BPOSS self-assembled and stabilized into supramolecular sphere via p-p interactions through a completely different mechanism with precious two cases. These studies indicate that "bottom-up" self-assemble based on well-defined giant molecules approach can be rather powerful to fabricate usually complicated hierarchical structures and open up a wide field of supramolecular self-assembly with unexpected structure and properties.

Complex Macromolecular Architectures

Author : Nikos Hadjichristidis
Publisher : John Wiley & Sons
ISBN 13 : 0470828277
Total Pages : 840 pages
Book Rating : 4.4/5 (78 download)

DOWNLOAD NOW!

Book Synopsis Complex Macromolecular Architectures by : Nikos Hadjichristidis

Download or read book Complex Macromolecular Architectures written by Nikos Hadjichristidis and published by John Wiley & Sons. This book was released on 2011-04-20 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of CMA (complex macromolecular architecture) stands at the cutting edge of materials science, and has been a locus of intense research activity in recent years. This book gives an extensive description of the synthesis, characterization, and self-assembly of recently-developed advanced architectural materials with a number of potential applications. The architectural polymers, including bio-conjugated hybrid polymers with poly(amino acid)s and gluco-polymers, star-branched and dendrimer-like hyperbranched polymers, cyclic polymers, dendrigraft polymers, rod-coil and helix-coil block copolymers, are introduced chapter by chapter in the book. In particular, the book also emphasizes the topic of synthetic breakthroughs by living/controlled polymerization since 2000. Furthermore, renowned authors contribute on special topics such as helical polyisocyanates, metallopolymers, stereospecific polymers, hydrogen-bonded supramolecular polymers, conjugated polymers, and polyrotaxanes, which have attracted considerable interest as novel polymer materials with potential future applications. In addition, recent advances in reactive blending achieved with well-defined end-functionalized polymers are discussed from an industrial point of view. Topics on polymer-based nanotechnologies, including self-assembled architectures and suprastructures, nano-structured materials and devices, nanofabrication, surface nanostructures, and their AFM imaging analysis of hetero-phased polymers are also included. Provides comprehensive coverage of recently developed advanced architectural materials Covers hot new areas such as: click chemistry; chain walking; polyhomologation; ADMET Edited by highly regarded scientists in the field Contains contributions from 26 leading experts from Europe, North America, and Asia Researchers in academia and industry specializing in polymer chemistry will find this book to be an ideal survey of the most recent advances in the area. The book is also suitable as supplementary reading for students enrolled in Polymer Synthetic Chemistry, Polymer Synthesis, Polymer Design, Advanced Polymer Chemistry, Soft Matter Science, and Materials Science courses. Color versions of selected figures can be found at www.wiley.com/go/hadjichristidis

Giant Molecular Shape Amphiphiles Based on Polyhedral Oligomeric Silsesquioszne

Author : Chang Liu
Publisher :
ISBN 13 :
Total Pages : 71 pages
Book Rating : 4.:/5 (913 download)

DOWNLOAD NOW!

Book Synopsis Giant Molecular Shape Amphiphiles Based on Polyhedral Oligomeric Silsesquioszne by : Chang Liu

Download or read book Giant Molecular Shape Amphiphiles Based on Polyhedral Oligomeric Silsesquioszne written by Chang Liu and published by . This book was released on 2013 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous research in our group has revealed that the giant molecular shape amphiphiles (GMSAs) based on polyhedral oligomeric silsesquioxane (POSS) and polystyrene (PS) can self-assemble into various micro-phase separated ordered structures due to the shape imcommensurateness and chemical incompatibility between the molecular building blocks. In contrast to their block copolymer analogues, feature sizes of the formed nanostructures can reach sub-10 nm scales, which is still a challenging task for block copolymer based materials. To further investigate the micro-phase separation properties of POSS based GMSAs, the degree of shape imcommensurateness should be enlarged and the effect of molecular architecture should also be considered. Following a recently developed sequential "click" strategy combined the utilization of "click" adaptor molecules, two novel series of GMSAs, which are: (1) two functionalized POSS cages tethered to one PS chain end (2DPOSS-PS), and (2) one functionalized POSS cage tethered to the core of one star-PS with three identical arms (DPOSS-3PS), have been designed and synthesized in an efficient and modular manner. The work discussed here provides necessary topological variations to our current libraries of GMSAs and thus allows systematic study on the self-assembly behaviors of our GMSA systems.

Design, Synthesis and Self-assembly of Shape Amphiphiles Based on Polyhedral Oligomeric Silsesquioxane-polymer Conjugates

Author : Kan Yue
Publisher :
ISBN 13 :
Total Pages : 225 pages
Book Rating : 4.:/5 (129 download)

DOWNLOAD NOW!

Book Synopsis Design, Synthesis and Self-assembly of Shape Amphiphiles Based on Polyhedral Oligomeric Silsesquioxane-polymer Conjugates by : Kan Yue

Download or read book Design, Synthesis and Self-assembly of Shape Amphiphiles Based on Polyhedral Oligomeric Silsesquioxane-polymer Conjugates written by Kan Yue and published by . This book was released on 2013 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hierarchally ordered supramolecular structures generated by self-assembly of various nano-materials have attracted great amount of interests due to their potentials in advanced material designs and applications via the "bottom-up" approach. In the field of polymer science, studies on block copolymers and their well-documented micro-phase separation behaviors have been one of the central themes during the past a few decades. The consequentially proposed block copolymer lithography based on these studies is considered as one of alternative solutions to complement the traditional photolithography and further reduce the feature sizes of microelectronic fabrications. However, it is still a grand challenge to achieve micro-phase separated ordered structures with sub-20 nm feature sizes in common block copolymer systems, as well as to obtain unconventional self-assembled ordered phases. It replies on the development of novel materials to resolve these problems. "Shape amphiphiles", constructed by the chemical integration of molecular nano-building blocks with distinct shapes and competing interactions, emerge as a novel class of nano-materials. In this dissertation, the molecular design and synthesis of a library of shape amphiphiles with precisely defined structures based on conjugates of functionalized polyhedral oligomeric silsesquioxanes (POSS) and polystyrene (PS) are presented. These POSS-PS conjugates capture the structural features of small molecule surfactants but represent their size-amplified analogues and are thus, also referred as "giant surfactants". The development of a "sequential click approach" and the utilization of a series of "click adaptor molecules" facilitated the modular and efficient precision synthesis and the feasible structural diversification of molecular architectures for a systematic investigation. It was subsequently revealed that in the bulk state, driven by the nano-phase separation between the functionalized POSS cages and the polymer chains, POSS-based shape amphiphiles can self-assemble into various kinds of ordered supramolecular phases depending on the relative volume fraction of the two components and the molecular topology. The unique structural features of POSS-based shape amphiphiles, such as the shape persistence of the POSS cages and the high x value due to the clustering of functional groups, resulted in an asymmetric phase diagram of ordered structures with sub-10 nm feature sizes. Moreover, self-assembly of these shape amphiphiles exhibited a remarkable sensitivity on the molecular architectures, which resembles the properties of small molecule surfactants rather than the block copolymers. By tuning the molecular architectures, some exceptional phases could be observed, such as an inversed honeycomb phase and a highly asymmetric lamellar phase, as observed in the multi-headed giant surfactant system. Therefore, it is concluded that POSS-based shape amphiphiles provide a versatile platform for advancing our understanding about the self-assembled diverse equilibrium phase structures with sub-20 nm feature sizes.

Giant Molecular Shape Amphiphiles Based on Hydrophilic [60]fullerene with Asymmetric Polymeric Tails

Author : Pengtao Lu
Publisher :
ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.:/5 (883 download)

DOWNLOAD NOW!

Book Synopsis Giant Molecular Shape Amphiphiles Based on Hydrophilic [60]fullerene with Asymmetric Polymeric Tails by : Pengtao Lu

Download or read book Giant Molecular Shape Amphiphiles Based on Hydrophilic [60]fullerene with Asymmetric Polymeric Tails written by Pengtao Lu and published by . This book was released on 2014 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inspired by nature, self-assembly, a "bottom up" approach, is now a well-established method to design and develop new materials. It was not until recently that the anisotropy and rigidity of the shape of nanobuilding blocks are also recognized as important parameters in the fine-tuning of self-assembled structures. "Shape amphiphiles", an entity combined by nanobuilding blocks which have distinct chemical properties and anisotropic geometries, thus got much attention from scientists in different fields, because shape amphiphiles can provide new opportunities to engineer materials possessing specific functionalities and physical properties dictated by unique packing of these novel building blocks. However, many previous researches only focused on shape amphiphiles made up of inorganic nanocrystals, while the potential of molecular shape amphiphiles between 1 to 10nms has not been explored yet. In my research, I will focus on one kind of shape amphiphiles in particular -- the attachment of diverse tails to the building blocks at precise positions. Specifically, this kind of shape amphiphiles is based on hydrophilic [60]fullerene and two polymeric tails with different chemical compositions. The synthetic strategy involved is a combination of Bingel-Hirsch reaction and controlled radical polymerization. The former one gives rice to efficient [60]fullerene surface functionalization, while the later one leads to precise control of the length of the polymeric tails. "Click philosophy", which found tremendous applications in synthesizing soft materials possessing well-defined structures in recent years, is also involved. The self-assembled structures of prepared asymmetric shape amphiphiles in solution will be thoroughly investigated by characterization tools, such as TEM (Transmission Electron Microscopy) and DLS (Dynamic Light Scattering), both in solution.

Janus Particle Synthesis, Self-Assembly and Applications

Author : Shan Jiang
Publisher : Royal Society of Chemistry
ISBN 13 : 1849735107
Total Pages : 313 pages
Book Rating : 4.8/5 (497 download)

DOWNLOAD NOW!

Book Synopsis Janus Particle Synthesis, Self-Assembly and Applications by : Shan Jiang

Download or read book Janus Particle Synthesis, Self-Assembly and Applications written by Shan Jiang and published by Royal Society of Chemistry. This book was released on 2012-11-30 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: Named after the two-faced roman god, Janus particles have gained much attention due to their potential in a variety of applications, including drug delivery. This is the first book devoted to Janus particles and covers their methods of synthesis, how these particles self-assemble, and their possible uses. By following the line of synthesis, self-assembly and applications, the book not only covers the fundamental and applied aspects, but it goes beyond a simple summary and offers a logistic way of selecting the proper synthetic route for Janus particles for certain applications. Written by pioneering experts in the field, the book introduces the Janus concept to those new to the topic and highlights the most recent research progress on the topic for those active in the field and catalyze new ideas.

Self-Assembly

Author : Ramanathan Nagarajan
Publisher : John Wiley & Sons
ISBN 13 : 1119001366
Total Pages : 364 pages
Book Rating : 4.1/5 (19 download)

DOWNLOAD NOW!

Book Synopsis Self-Assembly by : Ramanathan Nagarajan

Download or read book Self-Assembly written by Ramanathan Nagarajan and published by John Wiley & Sons. This book was released on 2019-01-07 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introduction to the state-of-the-art of the diverse self-assembly systems Self-Assembly: From Surfactants to Nanoparticles provides an effective entry for new researchers into this exciting field while also giving the state of the art assessment of the diverse self-assembling systems for those already engaged in this research. Over the last twenty years, self-assembly has emerged as a distinct science/technology field, going well beyond the classical surfactant and block copolymer molecules, and encompassing much larger and complex molecular, biomolecular and nanoparticle systems. Within its ten chapters, each contributed by pioneers of the respective research topics, the book: Discusses the fundamental physical chemical principles that govern the formation and properties of self-assembled systems Describes important experimental techniques to characterize the properties of self-assembled systems, particularly the nature of molecular organization and structure at the nano, meso or micro scales. Provides the first exhaustive accounting of self-assembly derived from various kinds of biomolecules including peptides, DNA and proteins. Outlines methods of synthesis and functionalization of self-assembled nanoparticles and the further self-assembly of the nanoparticles into one, two or three dimensional materials. Explores numerous potential applications of self-assembled structures including nanomedicine applications of drug delivery, imaging, molecular diagnostics and theranostics, and design of materials to specification such as smart responsive materials and self-healing materials. Highlights the unifying as well as contrasting features of self-assembly, as we move from surfactant molecules to nanoparticles. Written for students and academic and industrial scientists and engineers, by pioneers of the research field, Self-Assembly: From Surfactants to Nanoparticles is a comprehensive resource on diverse self-assembly systems, that is simultaneously introductory as well as the state of the art.

Synthesis and Characterization of Polyhedral Oligomeric Silsesquiozane Based Giant Molecular Shape Amphiphiles

Author : Kan Wu
Publisher :
ISBN 13 :
Total Pages : 88 pages
Book Rating : 4.:/5 (882 download)

DOWNLOAD NOW!

Book Synopsis Synthesis and Characterization of Polyhedral Oligomeric Silsesquiozane Based Giant Molecular Shape Amphiphiles by : Kan Wu

Download or read book Synthesis and Characterization of Polyhedral Oligomeric Silsesquiozane Based Giant Molecular Shape Amphiphiles written by Kan Wu and published by . This book was released on 2014 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three kinds of giant molecular shape amphiphiles (GMSAs) composed of functionalized polyhedral oligomeric silsesquioxane (POSS) cages and polystyrene (PS), including bolaform GMSAs (DPOSS-PS-DPOSS), double heads GMSAs (2DPOSS-PS) and hetero-POSS GMSAs (BPSS-PS-DPOSS), have been designed and synthesized via a sequential "click" methodology, which combines the ATRP, the copper-catalyzed Huisgen [3+2] cycloaddition (CuAAC) "click" reaction and the thiol-ene "click" reaction.[1,2] These molecules were fully characterized by 1H and 13C NMR, Fourier transform infrared spectroscopy (FT-IR), Matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) Mass Spectroscopy and gel permeation chromatograph (GPC). The self-assembly behaviors of BPSS-PS-DPOSS in bulk was studied by X-ray scattering techniques and transmission electron microscopy (TEM). Investigation on the self-assembly behaviors of BPOSS-PS-DPOSS shape amphiphiles reveals that these samples can micro-phase separate into a variety of different ordered structures, with feature sizes of the micro-domains being around or even below 10 nm. Hydrophilic DPOSS cages have strong enough competing interactions with PS, driving the formation of the self-assembled structures; while BPOSS cages are found favorably distributed within the PS domain. In the Lam phase, the BPOSS cages tend to form crystalline aggregations, due to the existence of the linear confinement with flat interfaces; while in other self-assembled structures, BPOSS cages are found randomly distributed in the PS matrix.

Amphiphilic Polymer Co-networks

Author : Costas S Patrickios
Publisher : Royal Society of Chemistry
ISBN 13 : 1839161345
Total Pages : 347 pages
Book Rating : 4.8/5 (391 download)

DOWNLOAD NOW!

Book Synopsis Amphiphilic Polymer Co-networks by : Costas S Patrickios

Download or read book Amphiphilic Polymer Co-networks written by Costas S Patrickios and published by Royal Society of Chemistry. This book was released on 2020-04-23 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: Amphiphilic polymer co-networks (APCNs) are a type of polymeric hydrogel, their hydrophobic polymer segments and hydrophilic components produce less aqueous swelling, giving better mechanical properties than conventional hydrogels. This new class of polymers is attracting increasing attention, resulting in further basic research on the system, as well as new applications. This book focuses on new developments in the field of APCNs, and is organised in four sections: synthesis, properties, applications and modelling. Co-network architectures included in the book chapters are mainly those deriving from hydrophobic macro-cross-linkers, representing the classical approach; however, more modern designs are also presented. Properties of interest discussed include aqueous swelling, thermophysical and mechanical properties, self-assembly, electrical actuation, and protein adsorption. Applications described in the book chapters include the use of co-networks as soft contact lenses, scaffolds for drug delivery and tissue engineering, matrices for heterogeneous biocatalysis, and membranes of controllable permeability. Finally, an important theory chapter on the modelling of the self-assembly of APCNs is also included. The book is suitable for graduate students and researchers interested in hydrogels, polymer networks, polymer chemistry, block copolymers, self-assembly and nanomaterials, as well as their applications in contact lenses, drug delivery, tissue engineering, membranes and biocatalysis.