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• W2892036706 abstract "In a previous work ( ACS Appl. Mater. Interfaces 2017, 9, 34349-34355), a facile approach was reported to prepare thin hydrogel films based on the Marangoni effect. After dripping onto a water surface, a drop of ethanol solution of poly(stearyl acrylate- co-acrylic acid) [P(SA- co-AAc)] spread quickly to form a thin film. The solvent exchange from ethanol to water led to the gelation of polymer solution which turned into a hydrogel film. Here, we investigate the scenario and seek for the governing kinetics of the Marangoni effect-assisted preparation of hydrogel films. By incorporating aggregation-induced emission fluorogens into the P(SA- co-AAc) solution, so that fluorescence appears at the gel state, we found that the spreading usually completed before the full gelation of the entire film. The spreading and formation of the gel films were influenced by the molar fraction of SA, f, and the polymer concentration of ethanol solution, CP. The spreading was blocked when CP was too high, whereas the film was fragmented into small pieces when CP was too low. At an intermediate CP, uniform hydrogel films were obtained. Steady spreading at a constant speed was observed during the processes which yielded uniform hydrogel films. Both CP and f influenced the spreading process by tuning the surface tension of the ethanol solution and the viscoelasticity of the gelated film, as suggested by our theoretical model. This work provided kinetic insights into the Marangoni phenomena of viscous polymer solutions. The strategy and principle should be applicable to other systems on preparing thin supramolecular gel films with versatile functions." @default.
• W2892036706 created "2018-09-27" @default.
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• W2892036706 date "2018-09-21" @default.
• W2892036706 modified "2023-10-18" @default.
• W2892036706 title "Kinetic Insights into Marangoni Effect-Assisted Preparation of Ultrathin Hydrogel Films" @default.
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• W2892036706 doi "https://doi.org/10.1021/acs.langmuir.8b02626" @default.
• W2892036706 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30240227" @default.
• W2892036706 hasPublicationYear "2018" @default.
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