| 초록 |
Surface-induced frost formation is an important problem in many aspects of our lives; ice and frost profoundly influences our activities. While this led to recent developments in engineered surfaces with desired wetting characteristics to prevent frost formation, there remains many questions yet to be resolved. Here, in a nanostructured hydrophilic film comprising of water-loving polysaccharides such as chitosan (CHI) and carboxymethyl cellulose (CMC), we demonstrate the role of a new design factor, the effect of oligo (ethylene glycol) (OEG) grafting on CHI (CHI-lin). As OEG in CHI-lin is a hydrophilic functional group with many active sites for the water to strongly interact with, it binds in the form of non-freezing bound water and inhibits ice nucleation and growth. We also perform mechanistic study of these films using differential scanning calorimetry (DSC) and X-ray absorption near edge structure (XANES) to confirm the interaction of the functional moieties with water molecules. |
