螺吡喃
肺表面活性物质
化学工程
化学
材料科学
纳米技术
光化学
光致变色
工程类
作者
Anjali Sharma,Yulia D. Gordievskaya,Nino Lomadze,Marek Bekir,Se‐Hyeong Jung,Andrij Pich,Svetlana Santer
出处
期刊:Soft Matter
[The Royal Society of Chemistry]
日期:2023-01-01
卷期号:19 (22): 4088-4098
被引量:3
摘要
We report on triggering of p(NIPAM-AA) microgels' photo-responsiveness by making complexes with a spiropyran (SP) containing surfactant. Being dissolved in water, the SP surfactant in its merocyanine state bears three charges, while irradiation with UV and vis light leads to the partial or complete reversal of the SP state. The complexation of the photo-responsive amphiphile with swollen anionic microgels results in charge compensation within the gel interior and as a consequence its size reduces and the volume phase transition temperature (VPTT) decreases down to 32 °C. Under irradiation the MC form photo-isomerizes to a ring closed SP state generating a more hydrophobic surfactant with one positive charge at the head. The increase in the hydrophobicity of the surfactant and thus of the interior of the gel results in the reversible size change of the microgel. We investigate the photo-responsivity of the microgel as a function of wavelength and irradiation intensity, as well as of surfactant concentration and charge density of the microgel. We show that the change in the size and VPTT of the microgels during irradiation occurs through a combination of two processes: heating of the solution during light absorption by the surfactant (more pronounced in the case of UV irradiation) and the change in the hydrophobicity of the surfactant.
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