Enthalpy-Driven Adsorption of Chain Molecules onto Chemically Heterogeneous Surfaces
Enthalpy-Driven Adsorption of Chain Molecules onto Chemically Heterogeneous Surfaces
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DOI：
10.1006/jcis.2001.7902
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发表时间：
2001-11
影响因子：
9.9
通讯作者：
A. Angelopoulos
中科院分区：
文献类型：
--
作者：
A. Angelopoulos
统计分析已用于开发化学异质分子的表面覆盖度的分析表达式，该化学异质分子以延长链构象吸附到化学异质表面上，使得单链吸附焓最小化。忽略横向相互作用，并且基质和吸附物上都包含足够数量的随机分布的吸附位点，使得位点相互作用被假定为不重叠但在其他方面是独立的。从水溶液中吸附到 Nafion® 离聚物膜和许多非离子聚合物基材上的阳离子聚丙烯酰胺的理论表面分数和实验测定的表面分数之间观察到良好的一致性。讨论了这种焓驱动吸附过程的更独特的理论预测。
Statistical analyses have been employed to develop analytical expressions for the surface coverage of chemically heterogeneous molecules adsorbed with extended-chain conformations onto chemically heterogeneous surfaces such that the single-chain adsorption enthalpy is minimized. Lateral interactions are neglected and a sufficient number of randomly distributed adsorption sites are included on both substrate and adsorbate such that site interactions are assumed to be nonoverlapping but otherwise independent. Good agreement is observed between the theoretical and experimentally determined surface fraction of a cationic polyacrylamide adsorbed from aqueous solution onto both a Nafion® ionomer membrane and numerous nonionic polymeric substrates. The more unique theoretical predictions for such enthalpy-driven adsorption processes are discussed.