Accession Number : ADA328610

Title :   Molecule-Sized Gates Based on Surface-Confined Dendrimers.

Descriptive Note : Technical rept. 1 Jun-31 Jul 96,

Corporate Author : TEXAS A AND M UNIV COLLEGE STATION DEPT OF CHEMISTRY

Personal Author(s) : Zhao, Mingqi ; Tokuhisa, Hideo ; Crooks, Richard M.

PDF Url : ADA328610

Report Date : 31 JUL 1997

Pagination or Media Count : 13

Abstract : In this report we demonstrate for the first time that surface confined-dendrimers embedded within self-assembled monolayers (SAMs) of alkylthiols can act as ion gates of molecular dimension. These composite organic thin films are conceptually, structurally, and chemically very similar to the membrane/protein composites found in nature. The key findings of this paper are that dendrimers can be well sealed within self-assembled alkylthiol monolayers and that as a function of the chemical state of the dendrimer, probe molecules can selectively and fully penetrate the dendrimer interior, exchange electrons within the dendrimer, and then diffuse back into the bulk solution. Molecular systems such as these are relevant for applications in electrocatalysis, chemical sensing, and separations.

Descriptors :   *CHEMICAL AGENT DETECTORS, SOLUTIONS(MIXTURES), COMPOSITE MATERIALS, THIN FILMS, GATES(CIRCUITS), DIFFUSION, ELECTRON TRANSFER, ALKYL RADICALS, THIOLS, ELECTROCATALYSTS.

Subject Categories : Polymer Chemistry
      Chemical, Biological and Radiological Warfare

Distribution Statement : APPROVED FOR PUBLIC RELEASE