Journal Article

PreJuSER-19093

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Arrest of morphological transformation during evaporation-induced self-assembly of mixed colloids in micrometric droplets by charge tuning

Sen, D. ; Savio Melo, J. ; Bahadur, J.FZJ* ; Mazumder, S. ; Bhattacharya, S. ; D'Souza, S. F. ; Frielinghaus, H.FZJ* ; Goerigk, G.FZJ* ; Loidl, R.FZJ*

2011
Royal Society of Chemistry (RSC) Cambridge

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Please use a persistent id in citations: http://hdl.handle.net/2128/7382  doi:10.1039/C1SM05100H

Abstract: 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.

Keyword(s): Polymers, Soft Nano Particles and Proteins (1st) ; Key Technologies (1st) ; Soft Condensed Matter (2nd) ; J

Note: Authors thank Dr S. Ramanathan of MSD, BARC for his kind help in zeta-potential measurements. DS would like to thank Drs Antoine Thill and Olivier Spalla of LIONS, SCM, DRECAM, CEA Saclay, France for many fruitful discussions on spray drying during his visit at CEA Saclay, France. DS and JB thankfully acknowledge financial support (DST(5)/AKR/P087/10-11/673) received from Department of Science and Technology, India through S. N. Bose National Centre for Basic Science, Kolkata, India for neutron scattering work at JCNS, Germany and ILL, France.

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Contributing Institute(s):

1. Neutronenstreuung (ICS-1)
2. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
3. Neutronenstreuung (JCNS-1)

Research Program(s):

1. BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung (P45)
2. Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) (P55)

Experiment(s):

1. KWS-1: Small angle scattering diffractometer (NL3b)
2. KWS-3: Very small angle scattering diffractometer with focusing mirror (NL3auS)

Appears in the scientific report 2011

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Database coverage:

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