Download or read book Nanosynthesis Techniques of Silica Coated Nanostructures written by Kwok Wei Shah and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Core-shell nanomaterials are fast-emerging hybrid nanocomposites in area of nanotechnology, materials science and biochemistry, which are fast attracting research attention. Nanostructured nanomaterials are utilized in wide industry fields such as electronics, biopharmaceutical, biomedicine, optics and biocatalysis. Owing to the additional exterior shell-coating material, the primary core material's functionality, biocompatibility, chemical stability and colloidal dispersibility can be greatly enhanced. Silica, in particular, is found to be an excellent exterior shell-coating material, has been widely researched for the synthesis of core-shell nanocomposite materials. So far, there have been numerous publications devoted to silica-coating techniques using hydrophobic silanes, such as tetraethylorthosilicate (TEOS) or tetramethyl orthosilicate (TMOS), via the classic Stober method. Recently, there has been strong interest in the use of water-soluble silanes such as MPTMS (3-(mercaptopropyl)-trimethoxysilane), MPTES (3-(mercaptopropyl-triethoxysilane), MTMS (3-(methyltrimethoxysilane)) and sodium silicate for water-based silica-coating techniques have gained much attention, due to the fast-growing need to focus on process simplicity, large-scale fabrication and environmental-friendly synthesis techniques of silica-based core-shell nanomaterials. Hence, this chapter focuses on the recent development on silica-coating techniques for colloidal nanoparticles, particularly on water-based techniques and morphologies. In summary, we emphasize the importance of advanced nanomaterials in today's world and envisage there will be more breakthrough research on aqueous silica-coating techniques for silica-encapsulated core-shell nanomaterials.
Download or read book Polymer Layered Silicate and Silica Nanocomposites written by Y.C. Ke and published by Elsevier. This book was released on 2005-07-13 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer-Layered Silicate and Silica Nanocomposites includes advanced materials and nanocomposites based on silica and layered silicates obtained from resources in China. Using nanotechnology, these inorganic materials can be filled, in-situ polymerised and combined with polymers with nanoscale dispersions. In this book, many practical examples are presented to show how to prepare the nanocomposites. Several kinds of polymer (PET,PBT,PE,PP,etc.)-layered silicate and silica nanocomposites are prepared and investigated based on our research works, inventions and applications. They are prepared and modified aiming at their applications to such fields as, functional films, barrier materials, coatings, and engineering plastics. Their structure-property relationship, especially the nano effects from them are investigated under different techniques to show how the critical load of the inorganic phase has the effect on the final properties of the nanocomposite materials. Obviously, this new generation of materials has revolutionary effects on the traditional materials or industry as petroleum. Some of the prospects of them are thus included. - Focus on the inorganic phase, which is of wide practical and industrial significance - Dealing with many first report of the nanoeffect, nanostructure and its functional properties - Especially, it covers the particle assembly and self-assemble by interaction with polymer matrix
Download or read book Silica based Organic inorganic Hybrid Nanomaterials Synthesis Functionalization And Applications In The Field Of Catalysis written by Rakesh Kumar Sharma and published by World Scientific. This book was released on 2019-11-05 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: Currently the field of nanocatalysis is undergoing many exciting developments and the design of silica-based organic-inorganic hybrid nanocatalysts is a key focus of the researchers working in this field.This book aims to present a succinct overview of the recent research progress directed towards the fabrication of silica-based organic-inorganic hybrid catalytic systems encompassing the key advantages of silica nanoparticles and silica-coated magnetic nanoparticles in an integrated manner. Featuring comprehensive descriptions of almost all approaches utilized for the synthesis of nanomaterials including some latest techniques such as flow and microwave-assisted synthesis that enable large-scale synthesis, it proves useful not only to academics but also industrialists. It also includes a systematic discussion on the vital characterization techniques employed for authenticating the structure of these.The title also offers an enormous amount of knowledge about the fusion of nanotechnology with green chemistry that strives to meet the scientific challenges of protecting human health and the environment.
Download or read book Novel Nanomaterials written by George Kyzas and published by BoD – Books on Demand. This book was released on 2018-04-18 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Nanomaterials" is a special topic of recent research and is a milestone of nanoscience and nanotechnology. Nanoscale materials are a series of substances/compounds, in which at least one dimension has smaller size than 100 nm. Nanomaterials have a broad area of development, which is growing rapidly day by day. Their impact on commercial applications as well as on the respective academia and education is huge. The basic points of this book can be divided into synthesis of nanomaterials and their applications. For example, special mention is about metal-oxide nanostructures, nanocomposites, and polymeric nanomaterials. Also, synthesis, characterizations, various processes, fabrications and some promising applications are also developed and analyzed.
Download or read book Synthesis Characterization of Silica Coated Iron Oxide Nanoparticles by Sol Gel Technique written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: \Alpha$-Fe_2O_3$ nanoparticles and Silica Coated $Fe_2O_3$ Particles were synthesized by hydrothermal method and acid - base hydrolysis of TEOS respectively. The Core Shell Particles has been characterized by SEM, XRD, and Particle size analysis. From particle size analysis, it was seen that, the distribution maxima of $Fe_2O_3$ and $Fe_2O_3@SiO_2$ coated nanoparticle were of 120 & 350 nm, 150nm & 550 nm respectively. From XRD analysis, it was confirmed that silica sample nanoparticles is amorphous in nature. The SEM/EDX analysis data represents the presence of $Fe_2O_3@SiO_2$ and show only the compositions of $Si, O & Fe2O_3$ peaks. As $Fe_2O_3$ nanoparticles show applications in many fields including high density magnetic storage devices, ferrofluids, magnetic refrigeration systems, and catalysis. Aggregation of nanoparticles can be prevented by coating the particles with other materials. The core/shell structure enhances the thermal and chemical stability of the nanoparticles, improves solubility, makes them less cytotoxic and allows conjugation of other molecules to these particles.
Download or read book Synthesis and Assembly of Porous Silica Nanostructures for X ray Catalyzed Reactions written by Laura Y. Chong and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The syntheses of silica materials provide many experimental methods that introduce different assemblies of nanoporous silica structures. Silica nanoparticles, hollow silica shells, core/shell structures and porous silica materials are examples of structures that have been synthesized in research works. A standard procedure for producing silica nanomaterials uses the established sol-gel Stöber process. Other developed methods also include solvothermal and hydrothermal techniques to prepare amorphous and crystalline silica materials. A review of the different approaches such as self-template, hard template, and soft template are described to present particular strategies that have been adapted to fabricate silica nanomaterials. The composition of silica scaffolds can include organic and inorganic states of matter. These adaptations can be utilized to achieve certain configurations during post synthetic treatments such as calcination and etching. The morphology of cubic and spherical silica particles are also studied to analyze the synthetic factors regarding the formation of shapes. Here, silica microcubes are produced after secondary precipitation of silica onto silica nanospheres. Hollow silica microcubes with different shell thicknesses are fabricated from the mSiO2@mSiO2 cubic particles through including additional silicate precursors during synthesizing the external layer followed by etching in warm water. Porous silica structures are recognized categories of materials that are applied for nanoscale storage and transport purposes. In this study, hollow silica microcubes are applied in the X-ray catalyzed hydroxylation of coumarin-3-carboxylic acid. X-ray induced enhancement occurs at the Type 1 and Type 2 proximities. Type 1 is described to be at least 100 nm away from the nanoparticle interface while Type 2 is within 100 nm from the nanoparticle interface. This review investigates current and viable methods to synthesize and apply porous silica nano-/micro-structures for research analyses.
Download or read book Nanostructured Materials written by Philippe Knauth and published by Springer Science & Business Media. This book was released on 2005-12-06 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured Materials: Selected Synthesis Methods, Properties and Applications presents several important recent advances in synthesis methods for nanostructured materials and processing of nano-objects into macroscopic samples, such as nanocrystalline ceramics. This book will not cover the whole spectrum of possible synthesis techniques, which would be limitless, but it presents especially interesting highlights in the domains of research of the editors. Subjects that are covered include the following: *"chimie douce" approaches for preparation of a large variety of nanostructured materials, including metals, alloys, semiconductors and oxides; *hydrothermal synthesis with water as solvent and reaction medium can be specifically adapted to nanostructured materials; *"electrospraying" as a powerful new route for the preparation of nanoparticles, especially of oxides for electroceramics; *nanoparticles processed into nanostructured ceramics, by using dynamic compaction techniques; *applications of nanostructured materials. This book complements the previous volume in this series (P. Knauth, J. Schoonman, eds., Nanocrystalline Metals and Oxides: Selected Properties and Applications, Kluwer, Boston, 2002).
Download or read book Nanotechnology for Smart Concrete written by Ghasan Fahim Huseien and published by CRC Press. This book was released on 2022-02-10 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanomaterials can markedly improve the mechanical properties of concrete, as well as reduce the porosity and enhance the durability of concrete. The application of nanotechnology in concrete is still in its infancy. However, an ever-growing demand for ultra-high-performance concrete and recurring environmental pollution caused by ordinary Portland cement has encouraged engineers to exploit nanotechnology in the construction industry. Nanotechnology for Smart Concrete discusses the advantages and applications of nanomaterials in the concrete industry, including high-strength performance, microstructural improvement, self-healing, energy storage, and coatings. The book Analyses the linkage of concrete materials with nanomaterials and nanostructures Discusses the applications of nanomaterials in the concrete industry, including energy storage in green buildings, anti-corrosive coatings, and inhibiting pathogens and viruses Covers self-healing concrete Explores safety considerations, sustainability, and environmental impact of nanoconcrete Includes an appendix of solved questions This comprehensive and innovative text serves as a useful reference for upper-level undergraduate students, graduate students, and professionals in the fields of Civil and Construction Engineering, Materials Science and Engineering, and Nanomaterials. Dr. Ghasan Fahim Huseien is a research fellow at the Department of Building, School of Design and Environment, National University of Singapore, Singapore. He received his PhD degree from the University of Technology Malaysia in 2017. Dr. Huseien has over 5 years of Applied R&D and 10 years of experience in manufacturing smart materials for sustainable building and smart cities. He has expertise in Advanced Sustainable Construction Materials covering Civil Engineering, Environmental Sciences and Engineering. He has authored and co-authored 50+ publications and technical reports, 3 books, and 15 book chapters, and participated in 25 national and international conferences/workshops. He is a peer reviewer for several international journals as well as Master’s and PhD students. He is a member of the Concrete Society of Malaysia and the American Concrete Institute. Dr. Nur Hafizah Abd Khalid is a Senior Lecturer at the School of Civil Engineering, Universiti Teknologi, Malaysia (UTM), and is a research member of the Construction Material Research Group (CMRG). She is currently a Council Member of the Concrete Society Malaysia (CSM). She earned her Master’s degree on structure and materials in 2011 from the Universiti Teknologi Malaysia. She received a Young Women Scientist Award (representing Malaysia) in 2014 in South Korea by KWSE/APNN. She is currently appointed as an Inviting Researcher at Hunan University, China, funded under the Talented Young Scientist Program (TYSP). Her research interests focus on concrete structural systems, advanced concrete technology (green concrete technology and fibre reinforced concrete), civil engineering materials, polymer composites, and bio-composites. Professor Dr. Jahangir Mirza has over 35 years of Applied Research and Development (R&D) as well as teaching experience. He has expertise in Advanced Sustainable Construction Materials covering Civil Engineering, Environmental Sciences and Engineering, Chemistry, Earth Sciences, Geology, and Architecture departments. He has been a Senior Scientist at the Research Institute of Hydro-Quebec (IREQ), Montreal, Canada since 1985. He has been a Visiting Research Professor for the Environmental Engineering program at the University of Guelph in Ontario, Canada since 2018.
Download or read book Nanostructured Materials Preparation via Condensation Ways written by Anatolii D. Pomogailo and published by Springer. This book was released on 2014-08-26 with total page 475 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is devoted to novel nanostructured materials and nanotechnology. A comprehensive analysis of the condensing methods of preparation of novel nanostructured materials is given. The methodology of power-consuming preparation of nanostructured materials is discussed, including thermolysis, photo- and radiolytic, electrochemical and mechanochemical methods. The peculiarities of chemical transformations in organic and inorganic matrices are compared. Special attention is given to kinetics and mechanism of the formation of nanocomposites. The structure and properties of such nanostructured materials are analysed.
Download or read book Synthesis and Characterization of Zirconia Coated Silica Nanoparticles for Catalytic Reactions written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Silica nanoparticles and zirconia coated silica nanoparticles were prepared by Stober method.and various subsequent methods. The nanoparticles obtained were characterized by XRD, SEM, EDAX and IR analytical techniques. The XRD study of pure ZrO2 shows well crystalline characteristics with the presence of 100% monoclinic phase. The coated nanoparticles are found to be amorphous in nature. SEM study indicate the particles to possess disorder morphology with the particle are attached to each other through grain boundary to form agglomerated structure. The zirconia coated silica nanoparticles were used as a efficient catalyst for the synthesis of Bis(indolyl) methane under solvent free condition. The Bis(indolyl) methane were obtained with high yield and purity.
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.
Download or read book Nanomaterials Based on Soluble Silicates written by Oleg Figovsky and published by . This book was released on 2020-08 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines water-soluble high-modulus silicate systems properties and production techniques, how these systems transform from lower to higher oligomers as well as formation of silica sol and of the sol-gel processes for these oligomers. The authors explore in-depth the different aspects of using these materials as a binder and modifiers for manufacturing of hybrid nanostructured composites through sol-gel processes, as well as features of their structuring. Production of nanostructured silica polymer concrete serves as an example of the application of such silicate systems. The book also covers application of the sols for production of the hybrid nanocomposite monolithic blocks and ultralight fire-resistant materials and techniques for producing of the new nanocomposite acid-resistant materials and linings for corrosive environments. The book is intended for a wide range of scientists, engineers and practitioners, as well as teachers, post-graduate students and senior students of technical colleges studying the technology of nanocomposite silicate-based materials.
Download or read book Nanostructured Smart Materials written by V. R. Remya and published by CRC Press. This book was released on 2021-06-30 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new volume presents various research studies that focus on the development of advanced nanomaterials and their composites and blends for different applications in sensing, electrical, biomedical, coating, industrial applications, etc. This book includes detailed discussions on the synthesis, properties, processing, and potential applications of nanomaterials and their blends and composites. Some chapters also explain the basic theoretical aspects of these nanostructured materials and systems, which help readers to develop a better understanding various application areas, including construction. Nanostructured Smart Materials: Synthesis, Characterization and Potential Applications responds to the need for advanced polymeric materials and nanostructured materials with ultimate performance and enhanced qualities and properties for varied applications. The chapters highlight information and research that will be valuable for development of new smart materials. This book will be a useful reference source for universities, colleges, researchers from R&D groups, scientists, postdoctoral fellows, industrialists, graduate and postgraduate students, and faculty.
Download or read book Silica Coated Nanocomposites written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation focuses on the development of colloidal synthetic approaches for silica encapsulation of nanocrystals as well as synthesis of hollow silica nanospheres and one-pot synthesis of silica coated nanocomposites. A series of experiments was performed which different nanoparticles were silica coated via microemulsion rout. The nanocomposites prepared were characterized by TEM, EDAX, SAED, XRD, absorption and luminescence spectroscopy. Luminescent semiconductor nanocrystals attracted increasing interest over the past several years, because of their intrinsic and size dependent optical properties. There has been a tremendous focus on the potential applications of these particles in areas such as tunable LEDs, QD lasers, luminescent materials and biolabeling. However, highly luminescent and photostable CdSe/ZnS core/shell quantum dots are not water dispersible because of their hydrophobicity. In the present work to create water dispersible quantum dots by an appropriate surface functionalization, monodispersed silica-coated CdSe/ZnS were synthesized by using the W/O microemulsion of NP-5/ Cyclohexan/ Water system. By hydrolysis of TEOS with ammonia in the presence of QDs, the silica coated nanoparticles were obtained in the microemulsion. In the composite nanoparticle, only single QD was located at the center of a spherical silica particle. The thickness of silica layer was 15 nm. Elucidating the coating mechanism was attempted. Possible mechanisms include a phase transfer by ligand exchange and a surfactant-supported mechanism. It was not possible to elucidate the encapsulation mechanism completely, but the experimental results point in the direction of a ligand-exchange/phase-transfer mechanism. I believe I have developed a simple general approach for creating nanocomposites with complex morphologies which can be used for a variety of materials, such as CdSe, etc. Therefore for prove this generality PbSe and YV(0.7)P(0.3)O4:Eu3+, Bi3+ has been chosen for e.
Download or read book Synthesis of Silica Nanofibers Embedded with Gold Nanoparticles by Laser Pulses and Sputtering Techniques written by Sarah Hamza and published by . This book was released on 2017 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many biomedical sensing applications require high electrical sensitivity as well as a method to control and implement them into biological applications. This requires a material to have both conductive and biocompatible properties. The lack of functional stability for implanted sensors has caused their restriction to short-term usage. Increasing the biocompatibility of these sensing devices generally causes a reduction in the overall conductivity due to the oxidation of the substrate. Silicon is becoming a more feasible and available option for use in these applications due to its semiconductor properties and availability. Previous work has proven the biocompatibility of porous Silicon through in-vitro testing with both SBF and NIH 3T3 culturing. A method to fabricate fibrous Silicon structures as well as control the conductivity of the latter through laser processing techniques and two coating methods are outlined in this thesis. The first involved Gold embedding through sputtering techniques, while the other utilized pre-coated Silicon achieved through PVD. An Nd:YAG pulsed nanosecond laser was employed to process the single crystalline Silicon wafers at a variety of line spacings, overlaps, and average powers. Controlling the scanning parameters were seen to induce the formation of nanofibrous structures. The conductivity of the samples were found to be dependent on both quantum effects and the overall Gold concentration on the surface. A biocompatibility assessment has shown traces of the elements necessary for the formation of hydroxyapatite. Overall, the method outlined in this research offers an economical and effective way to process Silicon into porous and fibrous structures while enhancing the conductivity and biocompatibility for the advancement of potential biomedical sensing and conductive tissue engineering applications.
Download or read book Characterisation and Peparation sic of Fluorescent Magetic sic Silica Nanoparticles for Drug Delivery written by Niancen Peng and published by . This book was released on 2010 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic silica nanoparticles with the core-shell structure were prepared by Stober method. There has been dramatic interest in the use of these particles for drug delivery in the recent years, however, little is known about their stability in aqueous environments. The aim of the current project is to examine their fate in water, to optimize their surface properties and finally to label them with a fluorescent dye for tracking purposes. Magnetic particles served as the core, and the silica shell was prepared from tetraethyl orthosilicate (TEOS). Changing the amount and the surface properties of the core, and varying the concentration of the shell or the solvent (ethanol) were conducted to prepare different types of magnetic silica nanoparticles. Different methods were used to characterize the nanoparticles, with the aim of finding the best conditions to prepare stable, uniform and narrow small sized nanoparticles. These measurements included: dynamic light scattering (DLS) for measuring the particles size, average count rate and to perform dissolution studies, differential scanning calorimetry (DSC) for thermal analysis of the dissolution process, UV/Vis Spectroscopy to study the turbidity, transmission electron microscopy (TEM), and measurement for zeta potential and pH. -- The first parameter studied was the magnetic core (Fe304). Coating these particles with citric acid seemed to improve the silica coating. This was attributed to the complexation between the TEOS and the citric acid, which resulted in uniform coating with silica. Another factor studied was the concentration of the precursor (TEOS). The results showed that the particle size increased with increasing the amount of TEOS. The latter was also accompanied by better stability (against dissolution) in water.
Download or read book Nanoparticles written by American Chemical Society. Meeting and published by . This book was released on 2008 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book summarizes recent advances in methods to synthesize, stabilize, passivate and functionalize diverse nanoparticles from metals, metal oxides, semiconductors, polymers, organics and biomolecules. A wide range of potential appplications with nanoparticles as building blocks are described.
