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Author : Christopher Kheng Hoe Teo
Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (163 download)
Download or read book Clonal Propagation of Strap-leafed Vanda by Shoot-tip Culture written by Christopher Kheng Hoe Teo and published by . This book was released on 1973 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 135 pages
Book Rating : 4.:/5 (16 download)
Download or read book Morphological Control of Multifunctional Mesoporous Silica Nanomaterials for Catalysis Applications written by and published by . This book was released on 2004 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: I found an efficient method to control the morphology of the organically monofunctionalized mesoporous silica materials by introducing different types of organoalkoxysilanes in a base-catalyzed co-condensation reaction. The monofunctionalized materials exhibit different particle morphologies relative to the pure MCM-41 material. The concentration dependence of the morphology is a critical factor to determine the final particle shape. A proposed mechanism of the shape evolution is also offered. After understanding the role of organoalkoxysilanes in producing various well-shaped nanomaterials, I also obtained a series of bifunctional mesoporous silica materials with certain particle morphology. A series of bifunctional mesoporous silica nanospheres (MSNs) whose physicochemical properties was investigated via solid state NMR techniques and Cu2+ adsorption capacity tests, The ratio of two different organic groups inside of mesopores of these MSNs could be fine-tuned. These MSNs serve as a useful model system to study substrate selectivity in catalytic reactions and sorption phenomena. For example, the Cu2+ adsorption capacity of these materials was dictated by the chemical nature of the mesopores generated by the different organic functional groups. An investigation of the substrate selectivity of the bifunctionalized MSNs in a competitive nitroaldol reaction using an equimolar amount of two competing 4-nitrobenzaldehyde derivatives was performed. Shape-controlled bifunctional MSNs were employed as the catalysts. The properties of the MSNs were investigated using various spectroscopic methods and electron microscopy. The more hydrophobic the surface organic groups are, the higher the ratio of hydrophobic final product. This is the first example to demonstrate the selection of substrate using physicochemical nature of the mesopore surface other than the conventional shape selection in zeolite systems. I also created a cooperative dual catalyst system that is capable of activating two different substrates in aldol reaction, Henry reaction and cyanosilylation. One catalytic group activates the nucleophile, another organic group simultaneously activates the electrophile to enhance the total reaction rate. I systematically vaned the amount of two organic groups and performed the three model reactions to compare rate enhancements.
Author : Seong Huh
Publisher :
ISBN 13 :
Total Pages : 256 pages
Book Rating : 4.:/5 (71 download)
Download or read book Morphological Control of Multifunctionalized Mesoporous Silica Nanomaterials for Catalysis Applications written by Seong Huh and published by . This book was released on 2004 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: I found an efficient method to control the morphology of the organically monofunctionalized mesoporous silica materials by introducing different types of organoalkoxysilanes in a base-catalyzed co-condensation reaction. The monofunctionalized materials exhibit different particle morphologies relative to the pure MCM-41 material. The concentration dependence of the morphology is a critical factor to determine the final particle shape. A proposed mechanism of the shape evolution is also offered. After understanding the role of organoalkoxysilanes in producing various well-shaped nanomaterials, I also obtained a series of bifunctional mesoporous silica materials with certain particle morphology. A series of bifunctional mesoporous silica nanospheres (MSNs) whose physicochemical properties was investigated via solid state NMR techniques and Cu2 adsorption capacity tests. The ratio of two different organic groups inside of mesopores of these MSNs could be fine-tuned. These MSNs serve as a useful model system to study substrate selectivity in catalytic reactions and sorption phenomena. For example, the Cu2+ adsorption capacity of these materials was dictated by the chemical nature of the mesopores generated by the different organic functional groups. An investigation of the substrate selectivity of the bifunctionalized MSNs in a competitive nitroaldol reaction using an equimolar amount of two competing 4-nitrobenzaldehyde derivatives was performed. Shape-controlled bifunctional MSNs were employed as the catalysts. The properties of the MSNs were investigated using various spectroscopic methods and electron microscopy. The more hydrophobic the surface organic groups are, the higher the ratio of hydrophobic final product. This is the first example to demonstrate the selection of substrate using physicochemical nature of the mesopore surface other than the conventional shape selection in zeolite systems. I also created a cooperative dual catalyst system that is capable of activating two different substrates in aldol reaction, Henry reaction and cyanosilylation. One catalytic group activates the nucleophile, another organic group simultaneously activates the electrophile to enhance the total reaction rate. I systematically varied the amount of two organic groups and performed the three model reactions to compare rate enhancements.
Author :
Publisher :
ISBN 13 :
Total Pages : 233 pages
Book Rating : 4.:/5 (911 download)
Download or read book Tailoring Properties of Multifunctional Mesoporous Silica Nanoparticles for Controlled Drug Delivery Applications written by and published by . This book was released on 2014 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yvonne Perrie
Publisher : Pharmaceutical Press
ISBN 13 : 0857110594
Total Pages : 257 pages
Book Rating : 4.8/5 (571 download)
Download or read book FASTtrack Pharmaceutics written by Yvonne Perrie and published by Pharmaceutical Press. This book was released on 2012 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Pharmaceutics - Drug delivery and targeting focuses on what pharmacy students really need to know in order to pass exams, providing concise, bulleted information, key points, tips and an all-important self-assessment section which includes MCQs."--Page 4 of cover.
Author : Sayantani Das
Publisher :
ISBN 13 :
Total Pages : 183 pages
Book Rating : 4.:/5 (11 download)
Download or read book Multifunctional Mesoporous and Nanostructured Catalysts written by Sayantani Das and published by . This book was released on 2012 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: Novel multifunctional mesoporous and nanostructured catalysts containing two or more different types of judiciously chosen functional / catalytic groups were developed and their unique and cooperative catalytic activities in various useful organic reactions were explored. First, mesoporous silica material containing tertiary amine/silanol groups was synthesized by simple postgrafting synthetic method. The material was found to exhibit efficient cooperative acid/base bifunctional catalytic activity towards Michael addition reactions between trans-¿ø-nitrostyrene and various active methylene compounds such as malononitrile, acetylacetone and dimethylmalonate. Besides serving as a solid base catalyst, such organoamine-functionalized mesoporous silica materials can be utilized as effective support materials for catalytically active organometallic complexes. This was demonstrated by immobilizing ethylenediamine onto mesoporous silica via postgrafting synthetic method and then complexing Fe(III) onto the supported ethylenediamine groups. This yielded a bifunctional Fe(III)/silanol-based heterogeneous catalyst that showed efficient catalytic activity towards epoxide ring opening reactions. Next, the potential of these types of organic-functionalized mesoporous silicas for immobilization of metallic nanoparticle catalysts was investigated. Specifically, mercaptopropyl-functionalized mesoporous silica was synthesized and the material was then supported with ultrasmall Aun nanoclusters. The catalytic properties of the resulting materials in styrene oxidation were studied. Furthermore, the effect of the removal of the thiol groups from around the surfaces of the gold nanoclusters on catalytic activities of the mesoporous silica-supported nanoparticles was investigated. As mesoporous silica have some limitations of crowding in their pores and poor mass transport for reactants when they are functionalized with larger groups such as nanoparticles, a new strategy was developed, where such catalytic groups were immobilized on the outer surface of silica microspheres. These supported nanoparticle catalytic groups on the silica nanospheres were further coated with a porous silica shell in order to overcome their possible aggregation, sintering and loss of catalytic activities. The resulting nanomaterials, dubbed produced SiO2-Au-pSiO2 core-shell-shell microspheres, were then used as efficient and recyclable nanocatalysts for styrene epoxidation. This strategy was further extended to core-shell-shell microspheres containing the metal (e.g., Pd) nanoparticles within G4 PAMAM dendrimers that are supported on silica nanosphere cores and coated by nanoporous silica shells. These nanomaterials, denoted as SiO2-Pd/PAMAM-pSiO2 core-shell-shell microspheres, were shown to serve not only as efficient and recyclable catalysts but also as selective catalysts for specific functional groups in hydrogenation reaction of various substrates.
Author : Juan Vivero-Escoto
Publisher :
ISBN 13 : 9781613244524
Total Pages : 0 pages
Book Rating : 4.2/5 (445 download)
Download or read book Silica Nanoparticles written by Juan Vivero-Escoto and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, the authors present topical research in the study of the preparation, properties and use of silica nanoparticles. Topics discussed include the reactivity of inorganic radicals and excited triplet states in colloidal silica suspensions; multifunctional mesoporous silica nanoparticles for controlled drug delivery, multimodal imaging and simultaneous imaging and drug delivery; monodisperse luminescent silica nanoparticles and their application to DNA microarray technology.
Author : Dongyuan Zhao
Publisher : John Wiley & Sons
ISBN 13 : 3527647899
Total Pages : 544 pages
Book Rating : 4.5/5 (276 download)
Download or read book Ordered Mesoporous Materials written by Dongyuan Zhao and published by John Wiley & Sons. This book was released on 2012-11-28 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mesoporous materials are a class of molecules with a large and uniform pore size, highly regular nanopores, and a large surface area. This book is devoted to all aspects and types of these materials and describes, in an in-depth and systematic manner, the step-by-step synthesis and its mechanism, as well as the characterization, morphology control, hybridization, and applications, of mesoporous molecular sieves. In so doing, it covers silicates, metal-doped silicates, nonsilicates, and organic-inorganic hybrids. Although the emphasis is on synthesis, the expert authors also discuss characterization and applications, ranging from catalysis and biochemistry to optics and the use of these materials as templates for nanomaterial synthesis. Both the fundamentals and the latest research results are covered, ensuring that this monograph serves as a reference for researchers in and newcomers to the field.
Author : Sachin Namdeo Kothawade
Publisher :
ISBN 13 : 9783111338446
Total Pages : 0 pages
Book Rating : 4.3/5 (384 download)
Download or read book Mesoporous Silica Nanoparticles written by Sachin Namdeo Kothawade and published by . This book was released on 2024-11-20 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mesoporous silica comprehensively covers the importance and applications of mesoporous silica nanoparticles in the field of nanoscience and nanotechnology. The book delves into the synthesis and characterization of mesoporous silica nanoparticles, discussing various synthesis methods and characterization techniques employed in their production. It explores the properties and structure of mesoporous silica nanoparticles, including their porosity, surface area, structural features, and tunability. It discusses mechanical, thermal, and optical properties. The applications of mesoporous silica nanoparticles in drug delivery are covered in detail, focusing on controlled release systems, targeted drug delivery, and theranostic applications.The catalytic applications of mesoporous silica nanoparticles are examined, including the use of these nanoparticles as supported catalysts in catalytic reactions, with discussions on reaction mechanisms. The book also explores the sensing and biosensing applications of mesoporous silica nanoparticles, including optical and electrochemical sensing, bioanalytical applications, and detection of biomolecules and environmental pollutants. Surface functionalization techniques for mesoporous silica nanoparticles are discussed, highlighting the importance of tailoring their properties for specific applications. Biocompatibility and toxicity considerations are addressed, providing insights into the assessment of biocompatibility, toxicity evaluation, mitigation strategies, and regulatory considerations. The future directions and emerging trends in mesoporous silica nanoparticle research are explored, along with interdisciplinary approaches, challenges, and opportunities in the field. The book concludes by summarizing the key findings and discussing the overall significance of mesoporous silica nanoparticles in nanoscience and nanotechnology. The references section provides a comprehensive list of sources used throughout the book for further exploration. The book serves as an essential resource for researchers, professionals, and students interested in understanding the synthesis, characterization, properties, and diverse applications of mesoporous silica nanoparticles in the realm of nanoscience and nanotechnology.
Author : 陳乃慈
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (875 download)
Download or read book Multifunctional Mesoporous Silica Nanocomposite Nanoparticles for Theranostic Applications written by 陳乃慈 and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Stefan Niedermayer
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (953 download)
Download or read book Multifunctional Mesoporous Nanoparticles for Catalysis, Sensing and Drug Delivery Applications written by Stefan Niedermayer and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 942 pages
Book Rating : 4.F/5 ( download)
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 942 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Chih-Hsiang Tsai
Publisher :
ISBN 13 :
Total Pages : 165 pages
Book Rating : 4.:/5 (86 download)
Download or read book Development and Application of Multi-functionalized Mesoporous Silica Nanomaterials in Intracellular Drug Delivery and Heterogeneous Catalysis written by Chih-Hsiang Tsai and published by . This book was released on 2012 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Esteban A. Franceschini
Publisher : CRC Press
ISBN 13 : 1000378926
Total Pages : 323 pages
Book Rating : 4.0/5 (3 download)
Download or read book Nanostructured Multifunctional Materials written by Esteban A. Franceschini and published by CRC Press. This book was released on 2021-06-03 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of nanomaterials plays a fundamental role in current and future technology applications, particularly nanomaterials that have multiple functionalities. This book provides a broad overview of the effect of nanostructuring in the multifunctionality of different widely studied nanomaterials. This book is divided into four sections constituting a road map that groups materials sharing certain types of nanostructuring, including nanoporous, nanoparticled, 2D laminar nanomaterials, and computational methods for characterizations of nanostructures. This structured approach in nanomaterials research will serve as a valuable reference material for chemists, (bio)engineers, physicists, nanotechnologists, undergraduates, and professors.
Author : Teresa Yi Kao
Publisher :
ISBN 13 :
Total Pages : 338 pages
Book Rating : 4.:/5 (16 download)
Download or read book Growth of Silica-based Nanoparticles written by Teresa Yi Kao and published by . This book was released on 2017 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silica chemistry provides a uniquely tunable platform for nanoparticle synthesis, where particle size, nanoscale morphology, and surface properties can be precisely controlled. Recent advances demonstrate that conveniently accessible parameters, including silica precursor chemistry, solvent, and reaction pH, can be used to tune particle size down to below 10 nm. By cooperative assembly of inorganic silica species and organic molecular structure directing agents, a diverse range of mesoporous silica nanoparticles with hexagonal, cubic, and multicompartment structures can be produced. This versatile chemistry provides pathways for answering fundamental questions about structure formation and developing novel functional nanomaterials for applications including separation, catalysis, and drug delivery. In this dissertation, two examples of such silica nanoparticle systems are discussed. As a first example, the development of an intensity-based fluorescent silica nanoparticle barcode is discussed. This work is motivated by a need for fluorescent tags that increase the number of molecular species that can be simultaneously labeled and reliably distinguished using commercially available fluorescence microscopes. In this study, the synthetic parameters that govern the incorporation of precisely controlled numbers of fluorescent dyes into silica nanoparticles in batch reactions are identified. Heterogeneities within particle batches are mapped using single particle fluorescence microscopy. Proof-of-concept experiments demonstrate that fluorescent silica nanoparticles with well-separated high and low fluorescence intensity distribution levels can be synthesized in batch reactions and used as an intensity barcode in fluorescence microscopy. In the second example, a mesoporous silica nanoparticle system, structure directed by surfactant-micelle self-assembly, is investigated. As a function of an added pore expander molecule or reaction stirring rate, a series of four distinct mesoporous silica nanoparticle structures is observed: hexagonal, cubic/hexagonal multicompartment, cubic, and dodecagonal quasicrystalline. The mechanism driving the structural transition between cubic crystalline and dodecagonal quasicrystalline mesoporous silica nanoparticles is investigated. Control of nanoparticle size down to a single tiling unit (
Author : Maria Carafa
Publisher : MDPI
ISBN 13 : 3038978949
Total Pages : 198 pages
Book Rating : 4.0/5 (389 download)
Download or read book Smart Nanovesicles for Drug Targeting and Delivery written by Maria Carafa and published by MDPI. This book was released on 2019-05-20 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: We can use the short text on the SI page for the description, or you make slight modifications on it. The description/summary is only for promotion (flyer, distribution channels), and will not be included in the book You can use the short text on the SI page for the description Nanovesicles are highly-promising systems for the delivery and/or targeting of drugs, biomolecules and contrast agents. Despite the fact that initial studies in this area were performed on phospholipid vesicles, there is an ever-increasing interest in the use of other molecules to obtain smart vesicular carriers focusing on strategies for targeted delivery. These systems can be obtained using newly synthesized smart molecules, or by intelligent design of opportune carriers to achieve specific delivery to the site of action. The drug/contrast agent-containing vesicles need to be directed to precise locations within the body to obtain desired magnitude and duration of the therapeutic or diagnostic effect. This spatial control in the delivery might open new avenues to modulate drug activity while avoiding side-effects and to optimize contrast agent properties while avoiding a broad distribution in the organism. However, delivering and targeting active substances into specific tissues and cells is still a challenge in designing novel therapeutic approaches against untreatable disorders, such as tumors and degenerative diseases.
Author : Ruining Wang
Publisher :
ISBN 13 :
Total Pages : 226 pages
Book Rating : 4.:/5 (116 download)
Download or read book Multifunctional Mesoporous Silica Nanoparticles for Drug and Large Molecule Delivery written by Ruining Wang and published by . This book was released on 2020 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis involves synthesis, derivatization and biomedical applications of mesoporous silica nanoparticles (MSNs) based delivery systems. Chapter 1 introduces the background of MSNs including the advantages of MSNs, modification on MSNs for multifunctionality; formation mechanism, a typical synthesis condition for MCM-41 and following characterizaitons. In chapter 2 & 3, the synthesis and application of target moiety functionalized MSNs for gene therapy in vitro and in vivo are introduced. Chapters 4, & 5 introduce the relevant studies of utilizing MSN based delivery system for the treatment of infectious disease, from a pharmacokinetic study of moxifloxacin delivered by MSNs via different routes, to the enhanced efficacy of MSN based treatment by materials optimizations via inhalation administration route. Chapter 6 discusses the study of a general synthesis method for pore enlargement in various types of MSNs. In Chapter 7, the design and preparation of a thin film consist of ultra large pore-sized mesoporous silica spheres and polymer template macropores is illustrated. Overall, these chapters demonstrate the successful engineering of mesoporous silica nanoparticles and materials optimization and their enhanced performance in biological applications from in vivo tumor shrinkage by gene delivery to antibiotics delivery for enhanced bacterial killing efficacy in mouse model.
