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Hofmeister Effect on PNIPAM in Bulk and at an Interface: Surface Partitioning of Weakly Hydrated Anions
Langmuir ( IF 3.7 ) Pub Date : 2017-04-27 00:00:00 , DOI: 10.1021/acs.langmuir.7b00953 Saeed Zajforoushan Moghaddam 1 , Esben Thormann 1
Langmuir ( IF 3.7 ) Pub Date : 2017-04-27 00:00:00 , DOI: 10.1021/acs.langmuir.7b00953 Saeed Zajforoushan Moghaddam 1 , Esben Thormann 1
Affiliation
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The effect of sodium fluoride, sodium trichloroacetate, and sodium thiocyanate on the stability and conformation of poly(N-isopropylacrylamide), in bulk solution and at the gold–aqueous interface, is investigated by differential scanning calorimetry, dynamic light scattering, quartz crystal microbalance, and atomic force microscopy. The results indicate a surface partitioning of the weakly hydrated anions, i.e., thiocyanate and trichloroacetate, and the findings are discussed in terms of anion-induced electrostatic stabilization. Although attractive polymer–ion interactions are suggested for thiocyanate and trichloroacetate, a salting-out effect is found for sodium trichloroacetate. This apparent contradiction is explained by a combination of previously suggested mechanisms for the salting-out effect by weakly hydrated anions.
中文翻译：
Hofmeister效应对本体和界面上PNIPAM的影响：弱水合阴离子的表面分配
氟化钠，三氯乙酸钠和硫氰酸钠对聚（N）的稳定性和构象的影响-异丙基丙烯酰胺），通过差示扫描量热法，动态光散射，石英晶体微量天平和原子力显微镜研究了散装溶液和金-水界面。结果表明弱水合阴离子，即硫氰酸根和三氯乙酸根的表面分配，并且根据阴离子诱导的静电稳定性讨论了这一发现。尽管建议对硫氰酸盐和三氯乙酸盐具有有吸引力的聚合物-离子相互作用，但对于三氯乙酸钠却发现有盐析作用。这种明显的矛盾是由先前建议的弱水合阴离子盐析作用机理的组合来解释的。
更新日期：2017-05-04
中文翻译：
Hofmeister效应对本体和界面上PNIPAM的影响：弱水合阴离子的表面分配
氟化钠，三氯乙酸钠和硫氰酸钠对聚（N）的稳定性和构象的影响-异丙基丙烯酰胺），通过差示扫描量热法，动态光散射，石英晶体微量天平和原子力显微镜研究了散装溶液和金-水界面。结果表明弱水合阴离子，即硫氰酸根和三氯乙酸根的表面分配，并且根据阴离子诱导的静电稳定性讨论了这一发现。尽管建议对硫氰酸盐和三氯乙酸盐具有有吸引力的聚合物-离子相互作用，但对于三氯乙酸钠却发现有盐析作用。这种明显的矛盾是由先前建议的弱水合阴离子盐析作用机理的组合来解释的。
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