聚乙烯醇二维光子晶体水凝胶的制备及乙醇响应行为

doi:10.7503/cjcu20180862

摘要/Abstract

摘要：

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(V_e)呈线性相关: 当60%≤V_e≤75%时, 其线性回归方程为ΔD=50.30V_e-31.74, r²=0.9734; 当75%<V_e≤100%时, 其线性回归方程为ΔD=111.14 V_e-74.03, r²=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.

关键词: 二维光子晶体, 水凝胶, 聚乙烯醇, 乙醇检测, 德拜环

Abstract:

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_e). In the range of 60%≤V_e≤75%, the linear regression equation is ΔD=50.30V_e-31.74, r²=0.9734. In the range of 75%<V_e≤100%, the linear regression equation is ΔD=111.14V_e-74.03, r²=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.

Key words: Two-dimensional photonic crystal, Hydrogel, Poly(vinyl alcohol), Determination of ethanol, Debye ring

中图分类号:

O631
O657

TrendMD:

任宸锐, 刘根起, 秦夏彤, 刘晨辉, 范晓东. 聚乙烯醇二维光子晶体水凝胶的制备及乙醇响应行为. 高等学校化学学报, 2019, 40(7): 1520.

REN Chenrui, LIU Genqi, QIN Xiatong, LIU Chenhui, FAN Xiaodong. Preparation of PVA Two-dimensional Photonic Crystal Hydrogel and Its Responsive Behavior to Ethanol^†. Chem. J. Chinese Universities, 2019, 40(7): 1520.

图/表 11

Scheme 1 Preparation of PVA·2DPCH

Fig.1 Illustration of the measurement principle of Debye ring(A) and photograph of Debye ring resulting from diffraction of green laser light by PVA·2DPCH(B)

Fig.2 SEM images of PS 2D photonic array(A) and PVA·2DPCH(B)Inset of (A): photograph of 2D photonic array on glass with a flashlight below at an angle of around 30° from the normal; inset of (B): photograph of PVA·2DPCH on glass with a flashlight below at an angle of around 30° from the normal.

Fig.3 Dependence of the Debye ring diameter(a) and particle spacing(b) of PVA·2DPCH in ethanol/water solution

Fig.4 Photographs of PVA·2DPCH in different ethanol aqueous solution Volume fraction of ethanol(%): (A) 60; (B) 70; (C) 80; (D) 90.

Fig.5 Diameter change of Debye ring with the volume fraction of ethanol increasing from 60% to 100%

Fig.6 Time dependence of Debye ring diameter of PVA·2DPCH

Fig.7 Comparison of PVA·2DPCH response to ethanol prior to dehydration(a)and after rehydration(b)

Fig.8 Reversible conversion of Debye ring diameter of PVA·2DPCH by alternately immersing in 50% and 80% ethanol aqueous solution

Table 1 Detection results of ethanol concentration in medical alcohol

Sample	Marking value	ΔD/mm	Found	Average	RSD(%)
75% medicinal alcohol	0.70—0.77	4.0, 4.8, 4.3, 5.0, 4.9	0.711, 0.726, 0.717, 0.730, 0.729	0.723	1.14
95% medicinal alcohol	0.95±0.05	28.3, 28.4, 27.9, 27.2, 27.5	0.920, 0.922, 0.917, 0.911, 0.914	0.917	0.48

Fig.9 Diffraction color of PVA·2DPCH in water(A) , 75% medicinal alcohol(B) and 95% medicinal alcohol(C)

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