Accession Number : ADA288229

Title :   Materials Design and Processing by Biomimicking. Section 1: Research Progress.

Descriptive Note : Final 3rd year rept. 1 Jun 91-31 May 94,

Corporate Author : WASHINGTON UNIV SEATTLE DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s) : Sarikaya, Mehmet ; Staley, James T.

PDF Url : ADA288229

Report Date : 31 MAY 1994

Pagination or Media Count : 89

Abstract : The goal of this research has been to find dispersants for ceramic processing applications. The polyelectrolytes currently in use in the industry are synthesized from toxic precursors which present health hazards to workers. We have investigated polyelectrolytes produced from natural sources such as bacteria and kelp, as well as some polymers which have been produced synthetically. The polyelectrolytes which we have investigated include polysaccharides (alginate and dextran) and polypeptides (polyglutamic acid and polyaspartic acid). Some have been obtained from cultures of bacteria grown in our laboratories, others have been obtained from chemical supply houses. In addition, we have investigated the feasibility of using an in Situ process by which we incubate the polymer-producing bacteria in the presence of ceramic powders. In this system, polymer adsorbs to the powder in a high affinity state, allowing subsequest washing to remove the bacterial cells, while retaining the adsorbed polymer.

Descriptors :   * CERAMIC MATERIALS, *DISPERSANTS, *COMPOSITE MATERIALS, HAZARDS, ADSORPTION, BACTERIA, CELLS, DEXTRAN, HEALTH, KELP, MATERIALS, NATURAL RESOURCES, PEPTIDES, POLYMERS, POLYSACCHARIDES, POWDERS, PRECURSORS, PROCESSING, TOXICITY, ALGINIC ACID, BIOCHEMISTRY, POLYELECTROLYTES, CITRIC ACID.

Subject Categories : Biochemistry
      Ceramics, Refractories and Glass
      Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE