DIRECT OBSERVATION OF A CROSSOVER FROM HETEROGENEOUS TRAVELING-WAVE TO LIESEGANG PATTERN-FORMATION

被引：48

作者：

ZRINYI, M ^{[1
]}

GALFI, L ^{[1
]}

SMIDROCZKI, E ^{[1
]}

RACZ, Z ^{[1
]}

HORKAY, F ^{[1
]}

机构：

[1] L EOTVOS UNIV,DEPT THEORET PHYS,H-1088 BUDAPEST,HUNGARY

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1991年 / 95卷 / 04期

关键词：

D O I：

10.1021/j100157a022

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A study of Liesegang band formation is presented with emphasis on the dependence of the precipitation pattern on its solubility. The formation of Cr(OH)3 precipitate has been studied by diffusing NaOH into chemically cross-linked poly(vinyl alcohol) gel containing Cr(NO3)3. The precipitate can sparingly redissolve in the surplus of NaOH. The formation, together with the dissolution of the precipitate, coupled with diffusion leads to a propagating band, instead of a final static pattern. A crossover from traveling band to Liesegang pattern formation has been also observed. A model, based on reaction-diffusion phenomenon, allows us to correlate the band movement with various kinetic and chemical processes.

引用

页码：1618 / 1620

页数：3

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