SYNTHESIS OF COPPER NANOSIZE PARTICLES IN ANIONIC REVERSE MICELLES - EFFECT OF T

2020-04-05 20:32:33

size concentration Of pitting CTAC

责任者: LISIECKI, I;BJORLING, M;MOTTE, L;NINHAM, B;PILENI, MP 单位: UNIV PARIS 06,SRSI LAB,URA 1662,F-75005 PARIS,FRANCE.;CENS,DRECAM,SCM,F-91191 GIF SUR YVETTE,FRANCE.;DEPT MATH APPL,CANBERRA,ACT 2601,AUSTRALIA. 来源出处: LANGMUIR, v 11, JUL 1995, p 2385- 2392 摘要: The size of copper nanoparticles in reverse micelles can be controlled by varying the water content of anionic reverse micelles (AOT = sodium bis(2-ethylhexyl)sulfosuccinate). In the presence of cetyltrimethylammonium chloride (CTAC), depending on the concentration, the size of the particles is strongly affected. At a low CTAC concentration ([CTAC] = 4 x 10(-4) M), an unexpectedly large increase in the size is observed. At the other extreme, a decrease in the size is observed at higher CTAC concentration ([CTAC] = 6.4 x 10(-3) M). The increase in the size at low CTAC concentration could be explained in terms of the formation of superaggregates containing most of the cationic surfactant. At higher CTAC concentrations, a random distribution of the positively charged surfactant takes place and the decrease in the size could be due to a decrease in the intermicellar attraction. Furthermore, the yield of particles drastically increases which is attributed to a change in the redox potential. 关键词: ANISOTROPIC PITTING; CHLORIDE SOLUTIONS; PASSIVITY; PIT INITIATION; PIT MORPHOLOGY; PITTING POTENTIAL MORPHOLOGY; PITTING POTENTIAL; ADHESIVE SPHERES; AEROSOL-OT; MICROEMULSIONS; SCATTERING; WATER