Surface Modification Of Silica Nanoparticles PDF Download
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Author | : Ezgi Gürbıyık |
Publisher | : |
Total Pages | : 77 |
Release | : 2009 |
Genre | : |
ISBN | : |
Download Surface Modification of Silica Nanoparticles Using "Click" Chemistry Book in PDF, ePub and Kindle
Author | : Hassan AlJama |
Publisher | : |
Total Pages | : 63 |
Release | : 2010 |
Genre | : |
ISBN | : |
Download Surface Modification of Silica Nanoparticles Using Surface Coupling Agents Book in PDF, ePub and Kindle
Author | : Rajesh Ranjan |
Publisher | : |
Total Pages | : 134 |
Release | : 2008 |
Genre | : Graft copolymers |
ISBN | : |
Download Surface Modification of Silica Nanoparticles Book in PDF, ePub and Kindle
Surface modification of nanosized silica particles by polymer grafting is gaining attention. This can be attributed to the fact that it provides a unique opportunity to engineer the interfacial properties of these modified particles; at the same time the mechanical and thermal properties of the polymers can be improved. Controlled free radical polymerization is a versatile technique which affords control over molecular weight, molecular weight distribution, architecture and functionalities of the resulting polymer. Three commonly used controlled free radical polymerizations include nitroxide-mediated polymerization (NMP), atom transfer radical polymerization (ATRP) and reversible addition fragmentation transfer (RAFT) polymerization. ATRP and RAFT polymerization were explored in order to modify the silica surface with well-defined polymer brushes. A novel click-functionalized RAFT chain transfer agent (RAFT CTA) was synthesized which opened up the possibility of using RAFT polymerization and click chemistry together in surface modification. Using this RAFT CTA, the surface of silica nanoparticles was modified with polystyrene and polyacrylamide brushes via the "grafting to" approach. Both tethered polystyrene and polyacrylamide chains were found in the brush regime. The combination of ATRP and click chemistry was also explored for surface modification. A combination of RAFT polymerization and click chemistry was also studied to modify the surface via the "grafting from" approach. Our strategy included the (1) "grafting from" approach for brush formation (2) facile click reaction to immobilize the RAFT agent (3) synthesis of R-supported chain transfer agent and (4) use of the more active trithiocarbonate RAFT agent. Grafting density obtained by this method was significantly higher than reported values in the literature. Polystyrene (PS) grafted silica nanoparticles were also prepared by a tandem process that simultaneously employs reversible addition fragmentation transfer (RAFT) polymerization and click chemistry. The click reaction doesn't interfere with RAFT polymerization. With a suitable choice of a Cu(I) catalyst, it is possible to perform both RAFT polymerization and click chemistry together. In a single pot procedure, azidemodified silica, an alkyne-functionalized RAFT agent and styrene were combined to produce the desired product. As deduced by thermal gravimetric and elemental analysis, the grafting density of PS on the silica in the tandem process was intermediate between the "grafting to" and "grafting from" techniques. Relative rates of RAFT polymerization and click reaction were altered to control grafting density. ATRP was also used to modify the surface of silica nanoparticles via the "grafting from" approach. The surfaces of silica with homopolymers and diblock copolymers brushes were modified using surface initiated ATRP. The polymer grafted silica particles were characterized by FT-IR, TGA, XPS and elemental analysis.
Author | : E.F. Vansant |
Publisher | : Elsevier |
Total Pages | : 573 |
Release | : 1995-04-25 |
Genre | : Science |
ISBN | : 0080528953 |
Download Characterization and Chemical Modification of the Silica Surface Book in PDF, ePub and Kindle
Oxide surface materials are widely used in many applications, in particular where chemically modified oxide surfaces are involved. Indeed, in disciplines such as separation, catalysis, bioengineering, electronics, ceramics, etc., modified oxide surfaces are very important. In all cases, the knowledge of their chemical and surface characteristics is of great importance for the understanding and eventual improvement of their performances. This book reviews the latest techniques and procedures in the characterization and chemical modification of the silica surface, presenting a unified and state-of-the-art approach to the relevant analysis techniques and modification procedures, covering 1000 references integrated into one clear concept.
Author | : Sarit K. Das |
Publisher | : John Wiley & Sons |
Total Pages | : 485 |
Release | : 2007-12-04 |
Genre | : Technology & Engineering |
ISBN | : 0470180684 |
Download Nanofluids Book in PDF, ePub and Kindle
Introduction to nanofluids--their properties, synthesis, characterization, and applications Nanofluids are attracting a great deal of interest with their enormous potential to provide enhanced performance properties, particularly with respect to heat transfer. In response, this text takes you on a complete journey into the science and technology of nanofluids. The authors cover both the chemical and physical methods for synthesizing nanofluids, explaining the techniques for creating a stable suspension of nanoparticles. You get an overview of the existing models and experimental techniques used in studying nanofluids, alongside discussions of the challenges and problems associated with some of these models. Next, the authors set forth and explain the heat transfer applications of nanofluids, including microelectronics, fuel cells, and hybrid-powered engines. You also get an introduction to possible future applications in large-scale cooling and biomedicine. This book is the work of leading pioneers in the field, one of whom holds the first U.S. patent for nanofluids. They have combined their own first-hand knowledge with a thorough review of theliterature. Among the key topics are: * Synthesis of nanofluids, including dispersion techniques and characterization methods * Thermal conductivity and thermo-physical properties * Theoretical models and experimental techniques * Heat transfer applications in microelectronics, fuel cells, and vehicle engines This text is written for researchers in any branch of science and technology, without any prerequisite.It therefore includes some basic information describing conduction, convection, and boiling of nanofluids for those readers who may not have adequate background in these areas. Regardless of your background, you'll learn to develop nanofluids not only as coolants, but also for a host ofnew applications on the horizon.
Author | : Roziamarni Che Abdul Aziz |
Publisher | : |
Total Pages | : 180 |
Release | : 2014 |
Genre | : |
ISBN | : |
Download Synthesis of Silica Nanoparticles and Their Surface Modification for Fabrication of Hybrid Dental Nanocomposites Book in PDF, ePub and Kindle
Author | : D. Rubingh |
Publisher | : CRC Press |
Total Pages | : 548 |
Release | : 1990-10-23 |
Genre | : Science |
ISBN | : 9780824783570 |
Download Cationic Surfactants Book in PDF, ePub and Kindle
Focusing on the solution physical chemistry and surface properties of cationic surfactants, three major sections examine the properties of cationic surfactants themselves both in solution and at interfaces, the interactions of cationic surfactants with other materials, and applications of cationic s
Author | : Horacio E. Bergna |
Publisher | : CRC Press |
Total Pages | : 926 |
Release | : 2005-12-19 |
Genre | : Science |
ISBN | : 1420028707 |
Download Colloidal Silica Book in PDF, ePub and Kindle
In spite of the apparent simplicity of silica's composition and structure, scientists are still investigating fundamental questions regarding the formation, constitution, and behavior of colloidal silica systems. Colloidal Silica: Fundamentals and Applications introduces new information on colloid science related to silica chemistry as well
Author | : Yamina Ouabbas |
Publisher | : |
Total Pages | : |
Release | : 2006 |
Genre | : Chemical engineering |
ISBN | : |
Download Surface Modification of Silica Particles by Dry Coating Book in PDF, ePub and Kindle
Author | : Yashwant V Pathak |
Publisher | : Springer |
Total Pages | : 499 |
Release | : 2019-03-11 |
Genre | : Medical |
ISBN | : 3030061159 |
Download Surface Modification of Nanoparticles for Targeted Drug Delivery Book in PDF, ePub and Kindle
This unique book is the only one to discuss various new techniques developed to enhance the application of nanoparticulate drug delivery systems using surface modification of nanoparticles. The understanding of the surface characteristics nano-particles is growing significantly with the advent of new analytical techniques. Polymer chemistry is contributing to the development of many new versatile polymers which have abilities to accommodate many different, very reactive chemical groups, and can be used as a diagnostic tool, for better targeting, for more effective therapeutic results as well as for reducing the toxic and side effects of the drugs. Surface modification of such polymeric nanoparticles has been found by many scientists to enhance the application of nanoparticles and also allows the nano particles to carry specific drug molecule and disease /tumor specific antibodies which refine and improve drug delivery. Surface Modification of Nanoparticles for Targeted Drug Delivery is a collection essential information with various applications of surface modification of nanoparticles and their disease specific applications for therapeutic purposes.