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Elucidating The Structure Of Peptide Self Assembled Monolayers On Gold Nanoparticles
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Book Synopsis Elucidating the Structure of Peptide Self-assembled Monolayers on Gold Nanoparticles by : E. L. Colangelo
Download or read book Elucidating the Structure of Peptide Self-assembled Monolayers on Gold Nanoparticles written by E. L. Colangelo and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Self-Organized Arrays of Gold Nanoparticles by : Luca Anghinolfi
Download or read book Self-Organized Arrays of Gold Nanoparticles written by Luca Anghinolfi and published by Springer Science & Business Media. This book was released on 2012-06-16 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis addresses the fabrication and investigation of the optical response of gold nanoparticle arrays supported on insulating LiF(110) nanopatterned substrates. Motivated by the discovery of the intriguing effects that arise when electromagnetic radiation interacts with metallic nanostructures, the thesis focuses on the application of bottom-up approaches to the fabrication of extended-area plasmonic nanostructures, and the optimization of their optical response. By developing a sophisticated effective-medium model and comparing the experimental findings with model calculations, the author explores the role of the interparticle electromagnetic coupling and array dimensionality on the collective plasmonic behavior of the array, giving insights into the physical mechanisms governing the optical response.
Book Synopsis From Self Assembled Monolayers to Clickable Gold Nanoparticles by : Fabian Sander
Download or read book From Self Assembled Monolayers to Clickable Gold Nanoparticles written by Fabian Sander and published by . This book was released on 2014 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Molecular Dynamics Study of Alkanethiolate Self-Assembled Monolayer Coated Gold Nanoparticle by :
Download or read book Molecular Dynamics Study of Alkanethiolate Self-Assembled Monolayer Coated Gold Nanoparticle written by and published by . This book was released on 2007 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Through molecular simulations we have observed that the surface of gold nanoparticles become highly corrugated by the adsorption of alkanethiolate self assembled monolayers (SAMs). Furthermore, as the temperature is increased, the SAMs dissolve into the gold nanoparticle, creating a liquid mixture at temperatures much lower than the melting temperature of the gold nanoparticle. By analyzing the mechanical and chemical properties of gold nanoparticles at temperatures below the melting point of gold, with different SAM chain lengths and surface coverage properties, we have determined that the system is metastable. The model and computational results that provide support for this hypothesis are presented in this paper.
Book Synopsis Self-Assembled Monolayers on Gold Substrates by : Mihaela Georgeta Badin
Download or read book Self-Assembled Monolayers on Gold Substrates written by Mihaela Georgeta Badin and published by VDM Publishing. This book was released on 2008 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Self-assembled monolayers (SAMs) consist of densely packed long-chain organic molecules, which are chemisorbed on metal substrates through a sulfur head group. The purpose of this work, is to study the arrangement and structure of SAMs by IR, XPS, NEXAFS, STM, Ellipsometry and contact angle. While the first group of triptycenethiols and the second group of triarylaminethiols show a formation of disordered films on the gold surface, the third group of alkanethioacetates shows the formation of highly ordered monolayers. A further adsorption to upright oriented molecules is hindered due to kinetic effects. In the case of azo-molecules it is shown that the photoisomerization process is not reversible. These molecules are not able to form highly ordered monolayers on the gold surface due to the critical effect of azo-moiety.
Book Synopsis Thymine-functionalized Gold Nanoparticles by : Jingfang Zhou
Download or read book Thymine-functionalized Gold Nanoparticles written by Jingfang Zhou and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Monolayer protected nanoparticles (MPNs) display fascinating size-dependent electronic, optical and catalytic properties. They are promising candidates to be used as building blocks with which to construct new generation nanoarchitectures and nanodevices for sensing, electronic and optoelectronic applications. The aggregation and dispersion of colloidal nanoparticles is one of the key issues closely related to their potential applications. Our knowledge of the colloid stability of nanoparticle dispersions with small sizes is still in its infancy, however, thymine is one of the bases in DNA, and is a pH sensitive and chromatic molecule. In the present study, thymine-functionalized self-assembled monolayer protected gold nanoparticles were synthesized. Their morphology and surface structure were characterized using TEM, UV-vis, FTIR, DSC-TGA and XPS techniques. The colloid stability of thymine-capped gold nanoparticle dispersions as a function of the type and concentration of monovalent salt, pH and particle size in alkaline aqueous solution were investigated. The manipulation of colloid stability with light was further explored. The results and conclusions are summarized inthis thesis.
Book Synopsis The Assembly and Structure of Self-assembling Peptides by : Kyle Morris
Download or read book The Assembly and Structure of Self-assembling Peptides written by Kyle Morris and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Self-assembling molecules are central to a plethora of processes found in nature, biotechnology and even disease. The importance of the non-covalent interaction of monomers to the formation of fibrillar assemblies is evident in the repeated use of this mechanism throughout nature, from essential cellular processes such as the formation of the cytoskeleton to the production of silk. Further, it has been recognised in the last two decades that a self-assembly mechanism, that is the formation of amyloid, underpins the pathology of protein misfolding diseases; it is therefore essential to dissect these mechanisms. Despite recent technological and model system developments, self-assembling molecules remain challenging to investigate. Using combined structural and biophysical characterisations of penta- and hexa-peptide self-assembling model systems these investigations shed further light on the structure of amyloid-like fibrils. The elucidation of the structures of these fibrillar systems not only has implications for disease but also makes them well placed for consideration for biotechnological applications. In reflecting upon how cross-ß structural architectures can be organised in the fibrillar state, a molecular and supramolecular model of fibrils formed by a fragment of!-synuclein is reported. The fibrils are found to consist of a novel and elaborate cross-ß architecture that leads to a helical supramolecular assembly spanning length scales previously unobserved for such a system. Where self-assembly is a useful route to supramolecular structure formation, the use of low molecular weight gelator (LMWG) peptides to create fibrillar structures with defined material properties is also explored. The complex link between molecular structure, self-assembled architecture, fibril formation, fibril interaction and ultimately bulk material properties is described. It is found that the determinants of self-assembly are distinct from the determinants of gelation and so future LMWG design will have to consider both individually. This work presents methodological advances in the characterisation of self-assembled structures. The investigations presented here have relevance for disease related processes but also to the technological use of these systems as materials. Finally, this work emphasises the beauty of the extravagant, yet elegant connection between molecular interaction and supramolecular selfassembly.
Book Synopsis Controlling Long-Range Ordered Self-assembly of Solid-Binding Peptide Monolayers on Atomically Flat Layered Materials by : David Alan Starkebaum
Download or read book Controlling Long-Range Ordered Self-assembly of Solid-Binding Peptide Monolayers on Atomically Flat Layered Materials written by David Alan Starkebaum and published by . This book was released on 2016 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid-binding short peptides offer great promise as molecular building blocks in nanotechnology and nanomedicine. Some of these peptides can form self-organized nanostructures on solid surfaces due to highly specific coordination of inter-molecular forces enabled by conformational changes in the peptide. This study aims to examine how the organization of self-assembled monolayers formed by a phage display selected “wild-type” graphite binding peptide (GrBP5-WT) change with solution conditions, such as pH and ionic strength. The surface coverage and crystallinity of these peptide monolayers were shown to increase when incubated in 1mM sodium phosphate. In contrast, GrBP5-WT incubated in 1mM sodium hydroxide showed significantly decreased coverage, and no long-range-ordered structures. Zeta potential measurements of aqueous graphite powder dispersions showed a pH-dependent negative surface charge, which increased in magnitude when GrBP5-WT was added. A peptide mutant (GrBP5-M9) was designed by replacing two carboxylate residues with polar, but non-charged, amide residues. The mutant peptide formed crystalline nanostructures on graphite, which were unaffected by changes to the ionic strength or pH, and did not contribute additional negative charge to the graphite dispersion zeta potential. This showed that a simple mutation to a phage-display selected solid-binding peptide can eliminate its sensitivity to buffer and pH changes, facilitating the formation of more predictable bio/nano interfaces towards the development more robust biosensors and bioreactors. Self-assembly of GrBP5-WT and two other mutants (M6 and M8) was also shown on a variety of different atomically-flat 2D solid substrates, including CVD graphene on copper, and exfoliated BN, MoS2, MoSe2, WS2, and WSe2 on SiO2/Si. Although long-range ordered structures were shown on each substrate material, subtle differences in the patterns formed on each substrate indicate an important influence of the underlying crystal structure on the peptide nanostructure. The ready formation of ordered nanostructures opens the door for an investigation of the physical properties of number of hybrid nanomaterials. In particular, solid-binding peptides were shown to induce a molecular doping effect on the photoluminescence of single-layer MoSe2 (a 2D semiconductor with a direct band-gap in the visible light spectrum). Peptide self-assembly was also found to be sensitive to the presence of polymer residues commonly used in lithographic processing (such as PMMA). Indium microsoldering was investigated as a means to prepare electronic devices (such as graphene field-effect transistors) without contaminating the substrate.
Book Synopsis The Structure and Stability of Alkanethiol Self-assembled Monolayers on Gold by : Jingmin Han
Download or read book The Structure and Stability of Alkanethiol Self-assembled Monolayers on Gold written by Jingmin Han and published by . This book was released on 2004 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structure, Stability and Electron Transfer Characteristics of Self-assembled Monolayers Containing Internal Peptide Groups by : Robert Samuel Clegg
Download or read book Structure, Stability and Electron Transfer Characteristics of Self-assembled Monolayers Containing Internal Peptide Groups written by Robert Samuel Clegg and published by . This book was released on 1999 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Covalently Functionalized Gold Nanoparticles by : Michael Robert Ivanov
Download or read book Covalently Functionalized Gold Nanoparticles written by Michael Robert Ivanov and published by . This book was released on 2011 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: The gold nanoparticle core composition, shape, size, self assembled monolayer (SAM) formation kinetics, and SAM ligand packing density are all evaluated for thioctic acid, 6-mercaptohexanoic acid, or 11-mercaptoundecanoic acid monolayers. Transmission electron microscopy (TEM), 1 H NMR, extinction spectroscopy, zeta potential, X-ray photoelectron spectroscopy (XPS), and flocculation studies are used to assess the morphology, surface chemistry, optical properties, surface charge, SAM packing density, and effective stability of carboxylated nanoparticles, respectively. Using these well-characterized nanostructures, applications of gold nanoparticle pseudostationary phases in capillary electrophoresis is studied.
Book Synopsis Zwitterionic Self Assembled Monolayers with Carboxybetaine Derivatives on Gold Nanoparticles to Resist Non-specific Protein Adsorption by : 馬漢娜
Download or read book Zwitterionic Self Assembled Monolayers with Carboxybetaine Derivatives on Gold Nanoparticles to Resist Non-specific Protein Adsorption written by 馬漢娜 and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structure of Self-assembled Monolayers on Gold Studied by NEXAFS and Photoelectron Spectroscopy by : Somsakul Watcharinyanon
Download or read book Structure of Self-assembled Monolayers on Gold Studied by NEXAFS and Photoelectron Spectroscopy written by Somsakul Watcharinyanon and published by . This book was released on 2008 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Relations of Gold (and Other Metals) to Light by : Michael Faraday
Download or read book Experimental Relations of Gold (and Other Metals) to Light written by Michael Faraday and published by . This book was released on 1857 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nanomaterials Self-assembly Driven by Beta-amyloid Peptides by : Maria Elena Tanase
Download or read book Nanomaterials Self-assembly Driven by Beta-amyloid Peptides written by Maria Elena Tanase and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanomaterials such as gold nanowires and gold nanoparticles were self-assembled with several peptides derived from beta-amyloid peptide. The peptides propensity to form fibrilar structures was exploited. The products obtained by aggregation of the peptides with the nano materials were studied using HPLC, UV-vis spectroscopy, TEM and optical light microscopy.
Book Synopsis Assemblies of Gold Nanoparticles at Liquid-Liquid Interfaces by : Evgeny Smirnov
Download or read book Assemblies of Gold Nanoparticles at Liquid-Liquid Interfaces written by Evgeny Smirnov and published by Springer. This book was released on 2019-02-08 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to various aspects of self-assembly of gold nanoparticles at liquid-liquid interfaces and investigation of their properties. It covers primarily two large fields: (i) self-assembly of nanoparticles and optical properties of these assemblies; and (ii) the role of nanoparticles in redox electrocatalysis at liquid-liquid interfaces. The first part aroused from a long-lasting idea to manipulate adsorption of nanoparticles at liquid-liquid with an external electric field to form 'smart' mirrors and/or filters. Therefore, Chapters 3 to 5 are dedicated to explore fundamental aspects of charged nanoparticles self-assembly and to investigate optical properties (extinction and reflectance) in a through manner. Novel tetrathiafulvalene (TTF)-assisted method leads to self-assembly of nanoparticles into cm-scale nanofilms or, so-called, metal liquid-like droplets (MeLLDs) with remarkable optical properties. The second part (Chapters 6 to 8) clarifies the role of nanoparticles in interfacial electron transfer reactions. They demonstrate how nanoparticles are charged and discharged upon equilibration of Fermi levels with redox couples in solution and how it can be used to perform HER and ORR. Finally, Chapter 9 gives a perspective outlook, including applications of suggested methods in fast, one-step preparation of colloidosomes, SERS substrates as well as pioneer studies on so-called Marangony-type shutters drive by the electric field.
Book Synopsis Curvature Driven Phase Separation in Mixed Ligand Coated Gold Nanoparticles by : Paulo H. Jacob Silva
Download or read book Curvature Driven Phase Separation in Mixed Ligand Coated Gold Nanoparticles written by Paulo H. Jacob Silva and published by . This book was released on 2006 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monolayer-coated gold nanoparticles have been the subject of extensive studies in fields ranging from physics to medicine. The properties of these nanomaterials such as solubility and surface energy are often attributed solely to the chemical functionalities of the ligand head-groups. However, the morphology of these monomolecular layers on gold nanoparticles plays as important of a role as the surface chemistry. Intriguing phase-separation phenomena have been observed for mixed self-assembled monolayers (SAM) of octanethiol (OT) and mercaptopropionic acid (MPA) on the surface of gold nanoparticles. These ordered structures are studied here through scanning tunneling microscope (STM) images, as a function of the gold core diameter, which is a measure of the particle's curvature. The packing of OT homoligand nanoparticles is found to have a head-group spacing of 0.54 nm, which differs from that on flat gold (111) surfaces, 0.5 nm. The OT:MPA heteroligand nanoparticles are observed to phase-separate into ordered ribbon-like domains, with spacings that depend on the nanoparticle diameter. A geometric framework that includes a continuous and crystallographic description is established to best describe the observed behaviors.