文章摘要
掺杂上转换纳米粒子的温敏性发光水凝胶的制备及性能
Preparation and Properties of Luminescent Thermo-sensitive Hydrogel doped with Upconversion Nanoparticles
投稿时间:2019-07-08  修订日期:2019-08-09
DOI:
中文关键词: 水热法  上转换纳米粒子  PNIPAM  发光温度响应性  水凝胶
英文关键词: hydrothermal method  upconversion nanoparticles  PNIPAM  luminescent thermo-sensitive  hydrogel
基金项目:西南民族大学研究生创新型科研项目(CX2018SZ127)
作者单位E-mail
张伟 西南民族大学 polymerzw@163.com 
廖正芳 西南民族大学  
阿尔普丁·艾尼娃尔 西南民族大学  
左芳 西南民族大学 polymerzf@126.com 
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中文摘要:
      采用水热法,以聚乙烯亚胺(PEI)为表面改性剂,合成了水分散性较好的上转换纳米粒子(UC@PEI NPs)。考察了溶剂组成、反应时间、PEI分子量与加入量对发光强度的影响,并进行表征。结果显示:V(H2O):V(EG) = 1:1,PEI(Mw = 10000)用量为1.2g,并于200 ℃反应8 h为最优合成条件。随后在UC@PEI NPs、聚N-异丙基丙烯酰胺(PNIPAM)存在下,丙烯酰胺、N,N'-亚甲基双丙烯酰胺发生自由基聚合,制备复合水凝胶,采用SEM、拉伸试验机、发光光谱仪进行形貌、机械强度和发光温度响应性的表征。结果表明:该互穿网络结构复合水凝胶反复脱水溶胀后,材料保持完好,平均脱水率和溶胀率为81.18%和61.38%;应力作用下的应变量达到251.10%,机械强度为38.09 kPa;在980 nm近红外光激发下,当温度从20 ℃升至48 ℃时,540 nm处(Er3+, 4S3/2 → 4I15/2)的发光强度减少42.64%,而当温度下降,发光强度可逆回升。说明该复合水凝胶具有可逆的上转换发光温度响应性,材料稳定性和拉伸性良好,并且有一定的机械强度。
英文摘要:
      Water-dispersive upconversion nanoparticles(UC@PEI NPs) were synthesized by hydrothermal method using polyethyleneimine(PEI) as surface modification agent. The effects of solvent components, reaction time, PEI molecular weight and addition amount on luminescence intensity were investigated and characterized. The results showed that the optimal synthesis conditions were V(H2O):V(EG) = 1:1, PEI(Mw = 10000) was added 1.2 g, and reacted at 200 ℃ for 8 h. Subsequently, in the presence of UC@PEI NPs and poly(N-isopropylacrylamide)(PNIPAM), acrylamide, N,N'-methylenebisacrylamide were copolymer-ized by free radical polymerization to prepare composite hydrogel. The morphology, mechanical strength and luminescent thermo-sensitive were characterized by SEM, tensile testing machine and luminescence spectrometer. The results showed that composite hydrogel with the interpenetrating network structure still remained intact after repeated dehydration and swelling, and the average dehydration ratio and swelling ratio were 81.18% and 61.38%; the strain under stress was 251.10%, and the mechanical strength was 38.09 kPa; under the excitation of 980 nm NIR laser, the luminescence intensity at 540 nm(Er3+, 4S3/2 → 4I15/2) decreases by 42.64% when the temperature rises from 20 ℃ to 48 ℃, and the luminescence intensity can be reversibly recovered when the temperature decreases. This shows that the composite hydrogel has the properties of reversible upconversion luminescent thermo-sensitive, good material stability, good stretchability, and has a certain mechanical strength.
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