%0 Journal Article
%A Sen, D.
%A Savio Melo, J:
%A Bahadur, J.
%A Mazumder, S.
%A Bhattacharya, S.
%A D'Souza, S.F.
%A Frielinghaus, H.
%A Goerigk, G.
%A Loidl, R.
%T Arrest of morphological transformation during evaporation-induced self-assembly of mixed colloids in micrometric droplets by charge tuning
%J Soft matter
%V 7
%@ 1744-683X
%C Cambridge
%I Royal Society of Chemistry (RSC)
%M PreJuSER-19093
%P 5423 - 5429
%D 2011
%Z 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.
%X 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.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000290937300045
%R 10.1039/c1sm05100h
%U https://juser.fz-juelich.de/record/19093