Confinement driven anomalous freezing in nano porous spray dried microspheres. (2nd July 2021)

• Record Type: Journal Article
• Authors: Biswas, Priyanka; Sen, Debasis; Prasher, Meenu; Sarkar, Sudip Kumar; Dasgupta, Kinshuk
• Is Part Of: Nanotechnology. Volume 32:Number 38(2021)
• Publication Date: 2021-07-02
• Subjects: microspheres -- confinement -- freezing -- porous -- spray drying; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/ac0ab6
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: One-step evaporative jamming of colloidal silica particles in contact-free spray droplets resulted in well-defined powder micro-granules with interstitial nanopores. This paper reports the anomalous freezing behaviour of confined water in the microspheres synthesized using spray drying. It has been revealed that the freezing point of water in these microspheres gets significantly lowered (∼−45 °C) owing to the confinement effect. Thermoporometry results are corroborated with the structural details obtained using complementary techniques of gas adsorption measurements and small-angle x-ray scattering.