基于智能弯曲双胶的铅离子可视化检测

Smart Bending Bigels for Visual Detection of Lead Ion

以4-乙烯基苯-18-冠-6为识别分子制备了由响应层和非响应层组成的对Pb2+敏感的智能弯曲双胶,并将光子晶体的有序结构引入双胶的凝胶网络增强其在检测中的可视性.将智能弯曲双胶置于不同浓度的Pb2+溶液中,其弯曲程度发生变化,且与Pb2+浓度相关.在裸眼观测条件下,根据智能弯曲双胶的弯曲程度可分辨0.1～10mmol/L范围Pb2+的浓度变化.此外,智能弯曲双胶的双层结构还可以抵消其它金属离子如Mg2+,Na+和Li+及温度变化等非特异性因素的干扰.基于上述实验发现,可以建立一种全新的Pb2+可视化检测方法,在Pb2+现场初筛检测中具有潜在的应用前景。

Using 4-acryloylamidobenzo-18-crown-6 as a recognitor, a Pb^2＋ sensitive smart bending bigel containing a response layer and a nonresponse layer was developed. Colloidal crystals were introduced into the bigel as a color-coded layer for visual detection. The bigel bended corresponding to Pb^2＋ concentration when it was immersed in the Pb^2＋ solutions. The changes of Pb^2＋ concentration in a range of 0.1-10 mmol/L can be distinguished by the naked eyes according to the bending degree of the bigels. Furthermore, the double-layer structure of the bigel can counteract the disturbance of non-specific factors such as metal ions （Mg^2＋, Na^＋ and Li^＋） and temperature. Based on our findings, a novel visual detection method can be established for Pb^2＋, which will be utilized in Pb^2＋ primary analysis on the spot.