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FROM:
Priyanka Biswas (1,3), D. Sen (1,3), S. Mazumder (1,3), C.B. Basak (1) and P. Doshi (2)
(1) Solid State Physics and Glass and Advanced Materials Divisions, Bhabha Atomic Research Centre, Mumbai 400085, India
(2) Groton Laboratories, Pfizer Global Research and Development, Groton, 06340 Connecticut United States
(3) Homi Bhabha National Institute, Mumbai 400094, India
“Temperature mediated morphological transition during drying of spray colloidal droplets”, Langmuir, Vol. 32, No. 10, pp 2464-2473, 2016, DOI: 10.1021/acs.langmuir.5b04171
ABSTRACT: Understanding how a tiny dilute evaporative colloidal spray droplet gets transformed into a microgranule with a characteristic morphology is crucial from scientific as well as technological points of view. In the present work, it is demonstrated that the morphology and the size distribution of the microcapsules can be tuned simply by adjusting the drying temperature. Shape and size of the capsules are quantified at four different drying temperatures. It is shown that the morphology transits gradually from sphere to toroid with increasing temperature keeping the average volume-fraction of the correlated nanoparticles nearly unaffected for the synthesized granules. A plausible mechanism for the chronological pathway of such morphological transformation is illustrated. Computer simulation corroborates the experimentally observed morphological transition. The variation in hollowness and buckling tendency of the capsules are elucidated by scattering and imaging techniques.
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