Surface Modification of Silica Particles by Dry Coating PDF Download
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Author: Yamina Ouabbas
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages :
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Book Description
Author: Yamina Ouabbas
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Superhydrophobic silica (SHS) powders are being evaluated as a potential additive to the polyurethane topcoats used in Chemical Agent Resistant Coating (CARC) systems, with the goal of improving water repellency and corrosion protection characteristics. The current generation of CARC topcoats is already highly loaded with solids, and thus there is a premium on minimization of the total SHS powder required to achieve the desired properties. Therefore, efficient surface modification of the silica and proper dispersion in the coating will be required. The effect of a dispersant on the surface modification of silica particles by chlorosilanes was addressed in this study. The properties of various SHS powders were characterized by thermogravimetric analysis and mass spectroscopy. Correlations between powder modification conditions and the ultimate effects of the modified particles on hydrophobicity of CARC topcoats were assessed. The use of contact and rolling angle measurements along with scanning electron microscopy are discussed as they pertain to the ability to quantify the effects of modified silicas on corrosion prevention coatings. Furthermore, a systematic approach to modifying and testing both powders and top coats of corrosion prevention systems is presented.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Dehydroxylated, silica-containing, glass surfaces are known to be at least partially terminated by strained siloxane rings. According to the invention, a surface of this kind is exposed to a selected silane compound or mixture of silane compounds under reaction-promoting conditions. The ensuing reaction results in opening of the strained siloxane rings, and termination of surface atoms by chemical species, such as organic or organosilicon species, having desirable properties. These species can be chosen to provide qualities such as hydrophobicity, or improved coupling to a polymeric coating.
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: 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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Book Description
Author: Antonello Astarita
Publisher: Trans Tech Publications Ltd
ISBN: 3035735255
Category : Technology & Engineering
Languages : en
Pages : 488
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Book Description
The book is a collection of the papers and the keynote lectures presented at the 33rd Surface Modification Technologies Conference (SMT33) which was held in Naples on 26 to 28 June 2019. The conference was focused on surface engineering and covered the following areas: corrosion, treatments, characterization, additive manufacturing, coatings, modification technologies. This book transfers up-to-date knowledge from scientist and experts to the common practice, representing a valuable resource for engineers, designers, researchers, and students.
Author: Zhenkun Zhang
Publisher:
ISBN: 9789036525138
Category :
Languages : en
Pages : 144
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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: Atul Tiwari
Publisher: John Wiley & Sons
ISBN: 1118938445
Category : Technology & Engineering
Languages : en
Pages : 646
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Book Description
The encyclopedia will be an invaluable source of information for researchers and students from diverse backgrounds including physics, chemistry, materials science and surface engineering, biotechnology, pharmacy, medical science, and biomedical engineering.
