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All-Poly(Ionic Liquid) Membrane-Derived Porous Carbon Membranes: Scalable Synthesis and Application for Photothermal Conversion in Seawater Desalination
摘要： Herein we introduce a straightforward, scalable and technologically relevant strategy to manufacture charged porous polymer membranes (CPMs) in a controllable manner. The pore sizes and porous architectures of CPMs are well-controlled by rational choice of anions in poly(ionic liquid)s (PILs). Continuously, heteroatom-doped hierarchically porous carbon membrane (HCMs) can be readily fabricated via morphology-maintaining carbonization of as-prepared CPMs. These HCMs being as photothermal membranes exhibited excellent performance for solar seawater desalination, representing a promising strategy to construct advanced functional nanomaterials for portable water production technologies.
关键词： porous carbon membrane,tailorable porous architecture,poly(ionic liquid),photothermal conversion,oxidative stability
更新于2025-09-23 15:21:01
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Evaluation of molecular spectroscopy for predicting oxidative degradation of biodiesel and vegetable oil: Correlation analysis between acid value and UV–Vis absorbance and fluorescence
摘要： The present study evaluated the applicability of UV–Vis absorption and fluorescence spectroscopy for monitoring oxidation level of oil extracted from white sesame seeds (Sesamum indicum L.) and its respective biodiesel degraded at 110 °C for various times. Correlations between spectroscopic data and acid value of the samples demonstrated that both optical techniques could be used to monitor the oxidative degradation. Additionally, a quantitative model to predict the acid value of oil and biodiesel using the UV–Vis absorption data was proposed. The prediction model was tested using a cross-validation (leave-one-out) analysis and demonstrated, for the first time, that the acid value of both biodiesel and vegetable oil can be predicted by applying the same protocol for UV–Vis spectra analysis. An average error of about 3 and 8% was achieved for the predicted acid value of the oil and biodiesel samples with respect to the measured acid values, respectively. Therefore, UV–Vis absorption technique could be applied to quantitatively monitor the oxidative degradation of vegetable oil and biodiesel in a rapid and practical way.
关键词： Oxidative stability,Optical spectroscopy,Biodiesel,Acid value,Vegetable oil
更新于2025-09-23 15:21:01
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Chemically resistant and thermally stable quantum dots prepared by shell encapsulation with cross-linkable block copolymer ligands
摘要： Endowing quantum dots (QDs) with robustness and durability have been one of the most important issues in this field, since the major limitations of QDs in practical applications are their thermal and oxidative instabilities. In this work, we propose a facile and effective passivation method to enhance the photochemical stability of QDs using polymeric double shell structures from thiol-terminated poly(methyl methacrylate-b-glycidyl methacrylate) (P(MMA-b-GMA)-SH) block copolymer ligands. To generate a densely cross-linked network, the cross-linking reaction of GMA epoxides in the PGMA block was conducted using a Lewis acid catalyst under an ambient environment to avoid affecting the photophysical properties of the pristine QDs. This provides QDs encapsulated with robust double layers consisting of highly transparent PMMA outer-shell and oxidation-protective cross-linked inner shell. Consequently, the resulting QDs exhibited exceptional tolerance to heat and oxidants when dispersed in organic solvents or QD-nanocomposite films, as demonstrated under various harsh conditions with respect to temperature and oxidant species. The present approach not only provides simple yet effective chemical means to enhance the thermochemical stability of QDs, but also offers a promising platform for the hybridization of QDs with polymeric materials for developing robust light-emitting or light-harvesting devices.
关键词： photochemical stability,block copolymer ligands,oxidative stability,cross-linking,thermal stability,quantum dots
更新于2025-09-23 15:19:57