1 research outputs found
Anti-Ice Nucleating Activity of Surfactants against Silver Iodide in Water-in-Oil Emulsions
Various
water-soluble substances are known as anti-ice nucleating
agents (anti-INAs), which inhibit heterogeneous ice nucleation initiated
by ice nucleating agents (INAs). Among them, several surfactants are
reportedly effective as anti-INAs especially against silver iodide
(AgI), which is a typical inorganic INA that induces heterogeneous
ice nucleation at relatively high temperatures. In this study, the
anti-ice nucleating activities of seven surfactants were examined
in emulsified surfactant solutions containing AgI particles. Among
previously reported anti-INAs (e.g., antifreeze proteins (AFPs), polyphenol
compounds and synthetic polymers), a cationic surfactant used in this
study, hexadecyltrimethylammonium bromide (C16TAB), showed the highest
anti-ice nucleating activity against AgI. Based on the unique concentration-dependent
dispersibility of AgI particles in C16TAB solution, the anti-ice nucleating
activity of C16TAB must be caused by the adsorption of C16TAB molecules
on AgI surfaces either as a monolayer or a bilayer depending on the
C16TAB concentration