Surface Modification of Silica Particles and Upconverting Particles Using Click Chemistry PDF Download
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Author: Heike Sabine Mader
Publisher:
ISBN:
Category :
Languages : en
Pages : 218
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Author: Heike Sabine Mader
Publisher:
ISBN:
Category :
Languages : en
Pages : 218
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Author: Ezgi Gürbıyık
Publisher:
ISBN:
Category :
Languages : en
Pages : 77
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Author: Rajesh Ranjan
Publisher:
ISBN:
Category : Graft copolymers
Languages : en
Pages : 134
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Book Description
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: Claudia Altavilla
Publisher: CRC Press
ISBN: 1315354306
Category : Science
Languages : en
Pages : 635
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Book Description
Upconverting Nanomaterials: Perspectives, Synthesis, and Applications serves as a powerful instrument that explores cutting-edge research knowledge on the topic of upconverting nanosystems, while simultaneously providing the necessary fundamental background for nonspecialist readers. The various aspects of upconverting materials are approached both from a theoretical point of view, particularly upconverting phenomenon, and a practical one. By presenting synthetic strategies, functionalization, production of core shell structures and nanocomposites, this book supplies PhD students, researchers, and scientists with a wealth of ideas they can apply to different fields of research. Thirty-five renowned scientists from around the world have collaborated to produce 11 chapters that help to "make a voyage" through the most important aspects of UPNPs, including syntheses, mechanism, functionalization, and applications.
Author: E.F. Vansant
Publisher: Elsevier
ISBN: 0080528953
Category : Science
Languages : en
Pages : 573
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Book Description
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: Yamina Ouabbas
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages :
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Author: Eugene Papirer
Publisher: CRC Press
ISBN: 9780824700034
Category : Science
Languages : en
Pages : 784
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"Progresses from theoretical issues to applications. Contains a historical overview, in-depth considerations of various scenarios of silica adsorption, and results from the latest research. Invaluable for broad coverage of the expanding field of silica research."
Author: Rafik Naccache
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Eric Brozek
Publisher:
ISBN:
Category : Nanoparticles
Languages : en
Pages : 145
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Author: Zhenkun Zhang
Publisher:
ISBN: 9789036525138
Category :
Languages : en
Pages : 144
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