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Titolo:
Traveling chemical waves for measuring solute diffusivity in thermosensitive poly(N-isopropylacrylamide) gel
Autore:
Yoshida, R; Otoshi, G; Yamaguchi, T; Kokufuta, E;
Indirizzi:
Univ Tsukuba, Inst Appl Biochem, Tsukuba, Ibaraki 3058572, Japan Univ Tsukuba Tsukuba Ibaraki Japan 3058572 sukuba, Ibaraki 3058572, Japan Natl Inst Mat & Chem Res, Tsukuba, Ibaraki 3058565, Japan Natl Inst Mat & Chem Res Tsukuba Ibaraki Japan 3058565 aki 3058565, Japan
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY A
fascicolo: 14, volume: 105, anno: 2001,
pagine: 3667 - 3672
SICI:
1089-5639(20010412)105:14<3667:TCWFMS>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
BELOUSOV-ZHABOTINSKII REACTION; VOLUME PHASE-TRANSITION; SELF-OSCILLATING GELS; POLYMER GELS; N-ISOPROPYLACRYLAMIDE; DRUG-DELIVERY; SYSTEM; HYDROGELS; COLLAPSE; FIELD;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Yoshida, R Univ Tokyo, Grad Sch Engn, Dept Mat Sci, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan Univ Tokyo 7-3-1 Hongo Tokyo Japan 1138656 okyo 1138656, Japan
Citazione:
R. Yoshida et al., "Traveling chemical waves for measuring solute diffusivity in thermosensitive poly(N-isopropylacrylamide) gel", J PHYS CH A, 105(14), 2001, pp. 3667-3672

Abstract

We have evaluated solute diffusivity in a gel by utilizing the Belousov-Zhabotinsky (BZ) reaction which is known as an oscillating reaction generating periodical redox changes of catalyst. The BZ reaction was induced in the thermosensitive poly(N-isopropylacrylamide) (PNIPAAm) gel. By measurement of the velocity of an excited pulse of the oxidized catalyst (i.e., chemicalwave) which propagates in the gel. the diffusivity of HBrO2 as an intermediate in the gel was determined. The temperature dependence of the diffusivity was investigated for the PNIPAAm gel and bulk solution systems. Contraryto the bulk solution system, the diffusivity in the PNIPAAm gel decreased when increasing temperature. It was found that transport of solute through the gel was controlled by regulating the swelling properties of the gel. From a comparison with the diffusivity obtained from a conventional permeability measurement using a gel membrane, the new measuring method was found tobe capable of almost same precision as the conventional method. The monitoring of the chemical wave would provide a novel experimental way for study of polymer gels.

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Documento generato il 06/07/20 alle ore 05:55:34