On the swelling behavior of poly(N-Isopropylacrylamide) hydrogels exposed to perfluoroalkyl acids.
On the swelling behavior of poly(N-Isopropylacrylamide) hydrogels exposed to perfluoroalkyl acids.
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DOI：
10.1002/pol.20200805
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发表时间：
2021-02-15
期刊：
影响因子：
--
通讯作者：
Dziubla TD
中科院分区：
文献类型：
--
作者：
Savage DT;Briot NJ;Hilt JZ;Dziubla TD
全氟烷基和多氟烷基物质（PFAS）由于在世纪初商业讨论之前的广泛使用而在环境中迅速积累，并且其缓慢降解加剧了对其潜在毒性的担忧。因此，有必要监测其分布情况，以评估和控制其对接触人群健康的影响。本调查评估的能力，一个简单的聚合物检测计划PFAS的基础上交联，温敏聚（N-异丙基丙烯酰胺）（PNIPAM）水凝胶。通过对几种水溶助长剂和类似碳氢化合物引起的溶胀扰动进行调查，发现全氟辛烷磺酸四乙铵（TPFOS）的溶胀比（15°C时为65.5 ± 8.8）明显高于任何其他测试分析物。将溶胀与溶剂无色染料尼罗红的荧光响应相结合，揭示了含氟表面活性剂引发可观察到的聚集（即，其临界聚集浓度）并达到饱和（即，发现含氟表面活性剂均匀地分布在整个聚合物基质中，能量色散X射线光谱法，标记的溶胀响应作为氟化界面定位和离域静电排斥的特殊关系。目前研究的结果有望利用PNIPAM的理化反应来评估TPFOS的浓度。
Per- and polyfluoroalkyl substances (PFAS) have rapidly accumulated in the environment due to their widespread use prior to commercial discussion in the early 21st century, and their slow degradation has magnified concerns of their potential toxicity. Monitoring their distribution is, therefore, necessary to evaluate and control their impact on the health of exposed populations. This investigation evaluates the capability of a simple polymeric detection scheme for PFAS based on crosslinked, thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) hydrogels. Surveying swelling perturbations induced by several hydrotropes and comparable hydrocarbon analogs, tetraethylammonium perfluorooctane sulfonate (TPFOS) showed a significantly higher swelling ratio on a mass basis (65.5 ± 8.8 at 15°C) than any of the other analytes tested. Combining swelling with the fluorimetric response of a solvachromatic dye, nile red, revealed the fluorosurfactant to initiate observable aggregation (i.e., its critical aggregation concentration) at 0.05 mM and reach saturation (i.e., its charge neutralization concentration) at 0.5 mM. The fluorosurfactant was found to homogeneously distribute throughout the polymer matrix with energy dispersive X-ray spectroscopy, marking the swelling response as a peculiar nexus of fluorinated interfacial positioning and delocalized electrostatic repulsion. Results from the current study hold promise for exploiting the physiochemical response of PNIPAM to assess TPFOS’s concentration.
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