Kimizuka Norihito
Faculty of Agriculture and Life Science, Hirosaki University, Postal address; 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan.
ACS Omega. 2021 Oct 8;6(41):26969-26975. doi: 10.1021/acsomega.1c03373. eCollection 2021 Oct 19.
Suspended solids, such as silica particles and cellulose fibers, were added to a sucrose aqueous solution, and ice crystals were coarsened at -10 °C. From the radius of the ice crystals, the coarsening rate constant was obtained using the Lifshitz-Wagner equation and the impact of the suspended solid on the coarsening of ice was evaluated. The results showed that the addition of the silica particle suppressed coarsening, but this behavior was not dependent on particle size. It was also shown that cellulose fibers suppressed coarsening more than silica particles. In order to clarify these causes, the present study investigated the correlation between - and the coarsening rate constants obtained from different suspensions. is the latent heat of fusion (calculated value) corresponding to the water content of the suspension, while is the latent heat of fusion (measured value) obtained by thermal analysis. A correlation was observed between - and the logarithm of the coarsening rate constant. - represents the volume of water that did not form ice crystals on the addition of the suspended solid (volume of unfrozen water at -10 °C), with a larger - associated with greater inhibition of coarsening. The present findings suggest that suspended solids inhibit coarsening by promoting ice crystal melting.
将悬浮固体，如二氧化硅颗粒和纤维素纤维，添加到蔗糖水溶液中，并在-10°C下使冰晶粗化。根据冰晶半径，使用 Lifshitz-Wagner 方程获得粗化速率常数，并评估悬浮固体对冰粗化的影响。结果表明，添加二氧化硅颗粒可抑制粗化，但这种行为并不取决于颗粒大小。还表明，纤维素纤维比二氧化硅颗粒更能抑制粗化。为了阐明这些原因，本研究调查了 - 与从不同悬浮液中获得的粗化速率常数之间的相关性。 是对应于悬浮液含水量的熔化潜热（计算值），而 是通过热分析获得的熔化潜热（测量值）。观察到 - 与粗化速率常数的对数之间存在相关性。 - 表示添加悬浮固体时未形成冰晶的水的体积（-10°C下未冻结水的体积）， - 越大，对粗化的抑制作用越强。本研究结果表明，悬浮固体通过促进冰晶熔化来抑制粗化。
