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    題名: Importance of Temperature Effect on the Electrophoretic Behavior of Charge-Regulated Particles
    作者: Hsu, Jyh-ping;Tai, Yi-hsuan;Yeh, Li-hsien;Tseng, Shio-jenn
    貢獻者: 淡江大學數學學系
    日期: 2012-01-10
    上傳時間: 2012-05-21 16:11:36 (UTC+8)
    出版者: American Chemical Society
    摘要: The Joule heating effect is inevitable in electrophoresis operations. To assess its influence on the performance of electrophoresis, we consider the case of a charge-regulated particle in a solution containing multiple ionic species at temperatures ranging from 298 to 308 K. Using an aqueous SiO2 dispersion as an example, we show that an increase in the temperature leads to a decrease in both the dielectric constant and the viscosity of the liquid phase, and an increase in both the diffusivity of ions and the particle surface potential. For a particle having a constant surface potential, its electrophoretic mobility is most influenced by the variation in the liquid viscosity as the temperature varies, but for a charged-regulated particle both the liquid viscosity and the surface potential can play an important role. Depending upon the level of pH, the degree of increase in the mobility can be on the order of 40% for a 5 K increase in the temperature. The presence of double-layer polarization, which is significant when the surface potential is sufficiently high, has the effect of inhibiting that increase in the mobility. This implies that the influence of the temperature on the mobility of the particle is most significant when the pH is close to the point of zero charge.
    關聯: Langmuir 28(1), pp.1013-1019
    DOI: 10.1021/la203245n
    顯示於類別:[數學學系暨研究所] 期刊論文


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