聚乙烯醇二维光子晶体水凝胶的制备及乙醇响应行为

Preparation of PVA Two-dimensional Photonic Crystal Hydrogel and Its Responsive Behavior to Ethanol

以单分散的聚苯乙烯微球乳液为原料,采用针尖注射法制备了聚苯乙烯二维光子晶体阵列,采用聚乙烯醇填充二维光子晶体阵列,以戊二醛为交联剂,得到聚乙烯醇二维光子晶体水凝胶(PVA·2DPCH).通过测定PVA·2DPCH在不同浓度的乙醇/水溶液中的德拜环直径(D)变化,研究了PVA·2DPCH对乙醇的响应行为.结果表明,在乙醇体积分数为0~60%范围内,PVA·2DPCH对乙醇没有明显响应,德拜环直径基本保持不变;当乙醇体积分数超过60%时,PVA·2DPCH对乙醇表现出敏感响应,其德拜环直径随乙醇体积分数的增大而增大,响应时间仅需30 s;在乙醇体积分数为60%~100%范围内,PVA·2DPCH的德拜环直径变化(ΔD)与乙醇体积分数(Ve)呈线性相关:当60%≤Ve≤75%时,其线性回归方程为ΔD=50.30 Ve-31.74,r^2=0.9734;当75%<Ve≤100%时,其线性回归方程为ΔD=111.14 Ve-74.03,r^2=0.9902.以制备的PVA·2DPCH为乙醇传感器,利用德拜环法测定市售酒精消毒液中乙醇含量,方法简单快速,兼具无标记、可视化检测的特点.

A poly(vinyl alcohol)two dimensional photonic crystal hydrogel(PVA 2DPCH)was prepared by infiltrating poly(vinyl alcohol)aqueous solution into two dimensional photonic crystal array using glutaraldehyde as a cross linking agent.By measuring the diameter change of the Debye ring,the responsive behavior of PVA 2DPCH in ethanol aqueous solution was investigated.The results showed that the diameter of the Debye ring was nearly unchanged when ethanol volume fraction increasing from 0 to 60%.When ethanol volume fraction exceeded 60%,PVA 2DPCH showed very sensitive response to ethanol.The diameter of the Debye ring increased with the increasing of the volume fraction of ethanol,and the response time took only 30 s.In the range of 60%100%ethanol volume fraction,the diameter change of Debye ring(ΔD)was linearly related to the ethanol volume fraction(V).In the range of 60%≤Ve≤75%,the linear regression equation is ΔD=50 30Ve-31 74,r^2=0 9734.In the range of75%<V≤100%,the linear regression equation is ΔD=111 14Ve-74 03,r^2=0 9902.Based on these,a novel visual testing method for ethanol in aqueous solution by Debye ring method was established,and it was simple and fast,which is used to determine the ethanol content in medicinal alcohol with satisfied results.