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Preparing CdS QDs in sodium alginate gel: realizing water-solubility and stimuli-responsiveness of QDs in an integrative way
摘要： Quantum dots (QDs) were of great interest due to the excellent fluorescence property and have been widely studied. Comparing with the typical organometallic synthetic routes and hydrothermal method that were usually carried out under high temperature, colloidal template could be used for preparing QDs in mild conditions and have gained increasing attention. In this prospect, hydrogel was an ideal colloidal template for preparation of QDs in aqueous medium while the related study for in-situ preparation of QDs in gel and the consequent functionalization of QDs was in demand. In this paper, we proposed a two-step method to prepare CdS QDs in sodium alginate (SA) gel which showed effective constraint in uniform size distribution of QDs. Without extra ligands introduction, the prepared CdS-SA QDs showed responsiveness to pH and detectability to Fe3+ which provide a simplified way for functionalization of QDs. The CdS-SA QDs showed good biocompatibility and stability in a certain concentration which indicated the application prospect of the CdS-SA QDs in fields of biological labeling and environmental sensor.
关键词： gel,stimuli responsiveness,pH,Sodium alginate,CdS QDs
更新于2025-09-19 17:15:36
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Synchronous enhancement and stabilization of graphene oxide liquid crystals: Inductive effect of sodium alginates in different concentration zones
摘要： A facile way to simultaneously induce the formation and enhance the stability of graphene oxide liquid crystals (GO LCs) is reported. Sodium alginate (SA) with both inductive effect and stabilization effect was added into GO suspensions to prepare LCs at low concentration that could survive harsh conditions. Most importantly, different concentration zones of SA brought significantly different LCs degree and stability, which possessed distinct charge properties, rheological behaviors and chain morphology. Adding 0.5 % SA located in entangled semi-dilute regime could induce the isotropic-nematic transition of GO at low concentration (< 0.035 %) and showed excellent liquid crystalline behavior due to the enhanced electrostatic repulsion of GO/SA colloids, while 1% SA located in concentrated solution regime brought better tolerance to NaCl, MgCl2, FeCl3, serum and pH of 1-13 due to the stronger bounding effect of entanglement network structure to countra-ions. This work develops a simple and eco-friendly method to prepare stable GO LCs at low GO concentration with application potentials especially in biomedical field, and the relationship between the concentration zones of SA and LCs behavior offers theoretical guidance for the self-assembly of GO macrostructures and design and efficient processing of its composites.
关键词： Sodium alginate,Liquid crystals,Graphene oxide
更新于2025-09-10 09:29:36
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AIP Conference Proceedings [Author(s) PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2017 (ISCPMS2017) - Bali, Indonesia (26–27 July 2017)] - Synthesis and photocatalytic activity of nanocomposite based on sodium alginate from brown algae with ZnO impregnation
摘要： The objective of this research is to synthesize nano sodium alginate-ZnO nanocomposite as photocatalyst to degrade methylene blue compounds. The successful synthesis of nano sodium alginate-ZnO nanocomposite was supported by the characterization of XRD (X-Ray Diffraction), FTIR (Fourier Transform Infrared), SEM (Scanning Electron Microscope) and TEM (Tunneling Electron Microscope). The first stage of the research was the synthesis of nano sodium alginate with particle size 140 nm and crystallinity index 38.78 % by XRD and TEM characterization, the obtained particle size was 146 nm x 61 nm. Nano ZnO particle size 38 nm, by XRD and TEM characterization the obtained particle size was 56.6 nm x 33.3 nm. The next stage of nanocomposite synthesis of nano sodium alginate was the impregnation with nano ZnO particle size 130 nm, by XRD and TEM characterization the particle size was 228.0 nm x 134.2 nm. The success was also supported by FTIR and SEM characterization. The final stage was the degradation of blue methylene using nano-sodium alginate-ZnO nanocomposite. The highest degradation percentage by nano sodium alginate-ZnO nanocomposite with zinc nitrate concentration of 0.075 M was 51.68% with the first order rate constant of 9.5 x10-3 /min.
关键词： methylene blue,nano ZnO,degradation,nanocomposite,nano sodium alginate
更新于2025-09-04 15:30:14