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Preparation and properties of novel ...

Chen, Tsung-yuan.

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Preparation and properties of novel nanocomposites using controlled polymer adsorption.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Preparation and properties of novel nanocomposites using controlled polymer adsorption./
作者:	Chen, Tsung-yuan.
面頁冊數:	179 p.
附註:	Adviser: P. Somasundaran.
Contained By:	Dissertation Abstracts International58-12B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9820153
ISBN:	9780591717884

Preparation and properties of novel nanocomposites using controlled polymer adsorption.
Chen, Tsung-yuan.

Preparation and properties of novel nanocomposites using controlled polymer adsorption. - 179 p.

Adviser: P. Somasundaran.

Thesis (D.E.S.)--Columbia University, 1998.

A new processing scheme has been developed for preparation of core-shell structured composite particles that can be used as building blocks for the fabrication of nanocomposites. The feasibility of such a processing scheme was investigated in detail using various techniques of modern instrumental analysis and classical colloidal chemistry.

ISBN: 9780591717884Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Preparation and properties of novel nanocomposites using controlled polymer adsorption.
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100 1 $a Chen, Tsung-yuan. $3 1265750
245 1 0 $a Preparation and properties of novel nanocomposites using controlled polymer adsorption.
300 $a 179 p.
500 $a Adviser: P. Somasundaran.
500 $a Source: Dissertation Abstracts International, Volume: 58-12, Section: B, page: 6755.
502 $a Thesis (D.E.S.)--Columbia University, 1998.
520 $a A new processing scheme has been developed for preparation of core-shell structured composite particles that can be used as building blocks for the fabrication of nanocomposites. The feasibility of such a processing scheme was investigated in detail using various techniques of modern instrumental analysis and classical colloidal chemistry.
520 $a The proposed processing scheme is a two-stage coating process utilizing controlled polymer adsorption and bridging mechanisms. Micronsize particles of alumina or silicon nitride were used as the starting cores. Anionic polymer (polyacrylic acid) was added to adsorb on the core particle surface and makes the deposition of nanoparticles on the core particles feasible. The residual polymer in the suspension was removed without detaching the preadsorbed polymers from the core particle surface. This made the core surface suitable for the second stage of the process--coating of oppositely charged nanosize particles. Nanosize alumina, titania and hematite powders were used for the coating studies. The nanoparticle coating was confirmed by techniques of electrokinetics, differential centrifugation and electron microscopy. The charge reversal of the micronsize composite particles exhibited a characteristic two-stage zeta potential change. A high affinity type coating isotherm was derived from the differential centrifugation data. Full coverage of the core particles by nanoparticles at saturation coating density was verified by SEM and TEM.
520 $a The preparation of multilayer composite particles and the application of the coating process in concentrated suspensions (15 volume percent) were tested and showed feasible. Ceramic compacts were successfully prepared using pressure filtration method; SEM imaging and EDS measurements revealed the superior homogeneity of the nanocomposites over the powder mixtures.
520 $a The major controlling factors of the coating process are the polymer bridging efficiency and the suspension stability. Using collision efficiency approach of polymer bridging flocculation, the current process was shown to be an optimum bridging condition, supporting the two-stage procedure. This work thus demonstrates the feasibility of new processing schemes using colloid chemical phenomena which can lead to precise control and modular processing of novel nanocomposite materials in the future.
590 $a School code: 0054.
650 4 $a Chemistry, Polymer. $3 1018428
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791 $a D.E.S.
792 $a 1998
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