Wang, Min, et al. ChemistrySelect 5.42 (2020): 13295-13299.
Preparation
Natural biocompatible ALG polyelectrolyte and semi-natural polyquaternium-10 (PQ-10) polycation electrolyte were selected as functional materials due to their unique biocompatibility, renewability and bactericidal properties. A novel hollow microcapsule was prepared by first depositing oppositely charged ALG and PQ-10 on calcium carbonate (CaCO3) particles alternately, and then dissolving the CaCO3 template with glacial acetic acid.
Characterization
ζ-potential and TG data showed that Alg and PQ-10 were successfully assembled onto the surface of CaCO3 microspheres. Thermogravimetric analysis showed that the mass ratio of the assembled multilayer polyelectrolyte film to (AlG/PQ-10)5@CaCO3 microspheres was about 7.6%. (ALG/PQ-10)5 hollow microcapsules have the characteristics of smooth surface, small pore size and complete structure. During the dissolution of the CaCO3 template, the residual Ca2+ in CaCO3 combined with the COO- group in ALG, making the structure of the hollow microcapsules stable. The hollow microcapsules present a typical folded structure with an average wall thickness of about 30 nm. In addition, the hollow microcapsules are highly selective for the charge of the encapsulated molecules.
Yang, Zhaojie, et al. Macromolecular Materials and Engineering 306.1 (2021): 2000506.
Anion exchange membrane (AEM) is the core component of anion exchange membrane fuel cell (AEMFC). It is not only a diaphragm between the anode and cathode, but also an OH-conductor. Therefore, its performance directly determines the actual performance of AEMFC. Cross-linked PVA/PQ-10 AEM has high IEC and low water absorption expansion, and its maximum ionic conductivity can reach 79.37 mS cm-1 at 80 °C. In addition, the PVA/PQ-10 cross-linked membrane has good oxidation and alkali stability.
Preparation of PVA/PQ-10 AEMs
Preparation of PVA and PQ-10 solution: PVA was added to distilled water and stirred at 95 °C for 6 hours to form 10 wt% PVA solution. PQ-10 was added to distilled water at room temperature and stirred for 4 h to form 4 wt%PQ-10 solution.
Preparation of PVA/PQ-10 film forming solution: According to the mass ratio of PVA to PQ-10 (PVA/PQ-10=1/x, x=0.25, 0.5, 0.75, 1, 1.25, 1.5), PVA and PQ-10 solution were weighed, and the total solid content of PVA and PQ-10 was 1.5 g. The mixed solution of PVA/PQ-10 was stirred at 30 °C for 1 h to make it mix evenly, then the mixed solution was dried in a vacuum drying box for 6 h to remove bubbles. The parameters of the vacuum oven are set as follows: the temperature is 30 °C and the pressure is - 100kPa. All solutions are left overnight to further remove bubbles.
Film forming process: The above solution was slowly poured into the polytetrafluoroethylene (PTFE) plate (13 cm x 13 cm) and laid evenly at the bottom of the board. After that, place the PTFE board in an oven at 30 °C for 24 hours to remove the solvent. Finally, the PVA/PQ-10 membrane was stripped from the PTFE board and placed in an oven at 30 °C for 24 hours to further remove the residual water from the membrane.
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