New Selection Criterion for a Base Polar Liquid in the Lifshitz-van der Waals/Lewis Acid-Base Approach
New Selection Criterion for a Base Polar Liquid in the Lifshitz-van der Waals/Lewis Acid-Base Approach
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DOI：
10.1021/jp200741v
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发表时间：
2011-06-30
影响因子：
3.7
通讯作者：
Mhin, Byung Jin
中科院分区：
文献类型：
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作者：
Hwang, Geelsu;Yang, Ji-hyun;Mhin, Byung Jin
为了从热力学的角度理解胶体或微生物对固体表面的粘附，界面能应该用相应的表面张力来计算。Lifshitz-van der Waals/刘易斯酸碱（LW-AB）方法最广泛地用于评估这些表面张力组分，并且需要固体与非极性液体、水和一种碱极性液体的接触角。霍兰德的标准已被建议用于基础极性液体的选择，而不管固体的性质。然而，根据极性液体的性质，经常发现固体的AB表面张力分量（γ（+）（s）和γ（-）（s）），特别是γ（+）（s）和界面能的正AB分量（Δ G（sl）（AB））的大偏差。在本研究中，从LW-AB方法的数学分析中推导出基础极性液体的以下选择标准：0 >（gamma（+）（p））（1/2）/（gamma（+）（w））（1/2）Delta G（sw）（AB）> Delta G（sp）（AB）>（gamma（+）（p））（1/2）/（gamma（+）（w））（1/2）Delta G（sw）（AB）[（gamma（-）（p）/gamma（+）（p））（1/2）-（γ（-）（w）/γ（+）（w））（1/2）+1]（s =固体; w =水;和p =基础极性液体）。使用四个模型固体，该标准已被评估为甘油，甲酰胺，乙二醇之间的基础极性液体的选择。当满足上述条件时，可以获得可靠的固体表面张力分量。当gamma（+）（w）和gamma（-）（w）被设置为相同时，上述准则则为Q（gamma）> [（Delta G（sw）（AB）（gamma（-）（p））（1/2））/（Delta G（sp）（AB）（gamma（-）（w））（1/2））]（2）> 1，这被认为是霍兰德准则的详细版本。
To understand the adhesion of a colloid or a microbe to a solid surface in terms of thermodynamics, the interfacial energy should be calculated with the respective surface tensions. The Lifshitz-van der Waals/Lewis acid base (LW-AB) approach is most widely used for the evaluation of these surface tension components and requires contact angles of the solid with an apolar liquid, water, and one base polar liquid. Hollander's criterion has been suggested for the selection of the base polar liquid regardless of the nature of the solid. However, large deviations in the AB surface tension components of the solid (gamma(+)(s) and gamma(-)(s)), especially gamma(+)(s), and the positive AB component of the interfacial energy (Delta G(sl)(AB)) have often been found depending on the nature of the polar liquid. In this study, the following selection criterion for the base polar liquid has been derived from a mathematical analysis of the LW-AB approach: 0 > (gamma(+)(p))(1/2)/(gamma(+)(w))(1/2)Delta G(sw)(AB) > Delta G(sp)(AB) > (gamma(+)(p))(1/2)/(gamma(+)(w))(1/2) Delta G(sw)(AB)[(gamma(-)(p)/gamma(+)(p))(1/2) - (gamma(-)(w)/gamma(+)(w))(1/2) + 1] (s = solid; w = water; and p = the base polar liquid). Using four model solids, this criterion has been evaluated for the selection of the base polar liquid among glycerol, formamide, and ethylene glycol. Reliable surface tension components of the solid were obtained when the above criterion was satisfied. When gamma(+)(w) and gamma(-)(w) are set to be identical, the above criterion is then Q(gamma) > [(Delta G(sw)(AB)(gamma(-)(p))(1/2))/(Delta G(sp)(AB)(gamma(-)(w))(1/2))](2) > 1, which is believed to be a detailed version of Hollander's criterion.