title: Ice nucleation and supercooling behavior of polymer aqueous solutions.
abstract: We determined the homogeneous nucleation temperature depression, DeltaT(f,hom), the equilibrium melting point depression, DeltaT(m), and the value lambda, which can be obtained from the linear relationship DeltaT(f,hom)=lambdaDeltaT(m), for aqueous solutions of PEG (200-20,000 g mol(-1)), PVP (10,000, 35,000, 40,000 g mol(-1)), and dextran (10,000 g mol(-1)) in the concentration range 0-40 wt% using the emulsion method. The molecular weight dependence of T(f,hom), T(m), and lambda in PEG aqueous solutions was found to change in the vicinity of Mw 600-1540 at all concentrations. In addition, it was confirmed that for all of the polymers studied, there was a good linear relationship between lambda and the logarithmic value of the self-diffusion coefficient D(0) of the solute molecule. These results indicate that the parameters that describe non-equilibrium freezing, such as T(f,hom) and lambda, are dependent on solution properties such as viscosity and self-diffusion of solute molecules.
authors.affiliation: Department of Food Science and Technology, Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato-ku, Tokyo 108-8477, Japan. ttn83z328n@mx8.ttcn.ne.jp
authors.forename: Norihito
authors.initials: N
authors.lastname: Kimizuka
authors.forename: Chotika
authors.initials: C
authors.lastname: Viriyarattanasak
authors.forename: Toru
authors.initials: T
authors.lastname: Suzuki
mesh_terms: D002152:Calorimetry, Differential Scanning; D003460:Crystallization; D004655:Emulsions / Q000737:chemistry; D007053:Ice; D011092:Polyethylene Glycols / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry; D011759:Pyrrolidines / Q000737:chemistry; D012996:Solutions / Q000737:chemistry; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
chemical_list: D004655:Emulsions; D007053:Ice; D011108:Polymers; D011145:Polyvinyls; D011759:Pyrrolidines; D012996:Solutions; C505150:poly(N-vinylpyrrolidine); D014867:Water; D011092:Polyethylene Glycols