Gao Yongfeng, Serpe Michael J
Department of Chemistry, University of Alberta , Edmonton, Alberta, Canada T6G 2G2.
ACS Appl Mater Interfaces. 2014 Jun 11;6(11):8461-6. doi: 10.1021/am501330z. Epub 2014 Apr 25.
Poly(N-isopropylacrylamide) (pNIPAm) microgel-based etalons were used to fabricate systems that change visual color in response to light exposure. These systems were fabricated by adding pH responsive microgel-based etalons to a solution composed of the photoacid o-nitrobenzaldehyde (o-NBA). Upon exposure of this system to ultraviolet (UV) irradiation, the photoacid released a proton, lowering the pH of the solution. Since the pNIPAm microgel-based etalon was responsive to pH, the etalon changed its optical properties and, hence, visual color. We went on to show that patterned etalons could be fabricated, which only contained pH-responsive microgels in specific regions. These etalons only changed color in the pH-responsive regions, to yield patterns that change color upon UV light exposure. Finally, the color of the etalon was shown to be fully reversible and could be switched multiple times. These unique systems could potentially be used for display technologies, and as a controlled/triggered drug delivery system.
基于聚（N-异丙基丙烯酰胺）（pNIPAm）微凝胶的标准具被用于制造能响应光照而改变视觉颜色的系统。这些系统是通过将基于pH响应性微凝胶的标准具添加到由光酸邻硝基苯甲醛（o-NBA）组成的溶液中制成的。当该系统暴露于紫外线（UV）照射下时，光酸释放出一个质子，降低了溶液的pH值。由于基于pNIPAm微凝胶的标准具对pH有响应，标准具改变了其光学性质，从而改变了视觉颜色。我们接着表明可以制造出图案化的标准具，其仅在特定区域包含pH响应性微凝胶。这些标准具仅在pH响应区域改变颜色，从而产生在紫外线照射下改变颜色的图案。最后，标准具的颜色被证明是完全可逆的，并且可以切换多次。这些独特的系统有可能用于显示技术，以及作为一种可控/触发式药物递送系统。
