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

doi:10.7503/cjcu20180862

Abstract

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

CLC Number:

O631
O657

TrendMD:

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

Figures/Tables 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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