Arrest of morphological transformation during evaporation-induced self-assembly of mixed colloids in micrometric droplets by charge tuning

被引：45

作者：

Sen, Debasis ^{[1
]}

Melo, Jose Savio ^{[2
]}

Bahadur, Jitendra ^{[1
]}

Mazumder, Subhasish ^{[1
]}

Bhattacharya, Shovit ^{[3
]}

D'Souza, Stanislaus Francis ^{[2
]}

Frielinghaus, Henrich ^{[4
]}

Goerigk, Guenter ^{[4
]}

Loidl, Rudolf ^{[5
]}

机构：

[1] Bhabha Atom Res Ctr, Div Solid State Phys, Mumbai 400085, Maharashtra, India

[2] Bhabha Atom Res Ctr, Nucl Agr & Biotechnol Div, Bombay 400085, Maharashtra, India

[3] Bhabha Atom Res Ctr, Tech Phys & Prototype Engn Div, Bombay 400085, Maharashtra, India

[4] Julich Ctr Neutron Sci, FRM 2, Garching, Germany

[5] Osterreich Univ, Atominst, A-1020 Vienna, Austria

来源：

SOFT MATTER | 2011年 / 7卷 / 11期

关键词：

DRIED NANOCOMPOSITE POWDERS; SMALL-ANGLE SCATTERING; SPRAY; PARTICLES; NANOPARTICLES; DISPERSION; REACTOR; SOL;

D O I：

10.1039/c1sm05100h

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：

Self-assembled grains of mixed colloids have been synthesized using evaporation induced self-assembly (EISA) by spray drying. We demonstrate using electron microscopy and small-angle neutron scattering experiments that buckling driven sphere to deformed-doughnut like morphological transformation in such a process can be arrested by proper tuning of the surface charge on the colloidal components. The buckling amplitude diminishes with a reduction in stabilization force between the colloidal particles. It is established that such arrest of morphological transformation is related to an effective exposure of the surface of softer component at gas-liquid interface. Scattering experiments confirm relatively more compact structure of the non-buckled grains compared to that of the buckled grains. A plausible mechanism regarding the arrest of morphological transformation by surface charge tuning is illustrated.

引用

页码：5423 / 5429

页数：7

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