Shaohui Wang,Yuzhe Liu,Hua Wang,Xiaowen Wang,Lin Li,Tonghua Wang
Template-free synthesis of advanced supercapacitor carbon with tunable interpenetrating micromesoporous structures remains a formidable challenge. Herein, porous carbon fibers with tunable mesopores were fabricated that were derived from discarded aramid fibers by H3PO4-assisted KOH activation without a template. The structural design of porous carbon fibers was achieved by utilizing the dehydration condensation reaction of H3PO4 with the amide groups in the aramid chain segments, which developed primary pores of porous carbon fibers and further facilitated K+ etching and embedding during subsequent KOH activation. The derived porous carbon fibers exhibited extremely tremendous specific surface area, abundant tunable mesopores, and N/O enriched surface. Benefiting from the synergy of the unique hierarchical porous structure and surface characteristics, the optimized porous carbon fiber provided an extremely high specific capacitance of 434.8 F g–1 at 0.2 A g–1 in a 6 M KOH electrolyte and excellent rate performance. Furthermore, in a 1 M Na2SO4 electrolyte, the assembled symmetric aqueous supercapacitor device displayed an ultrahigh energy density of 25.26 Wh kg–1 at a corresponding power density of 450 W kg–1, as well as remarkable cycling stability.
Colorectal cancer has emerged as a leading cause of global cancer-related morbidity and mortality, necessitating innovative therapeutic strategies. We developed a desilication-recrystallization method to synthesize Silicalite-1-X (X = 2, 8, 16, 32), a hierarchical porous silica molecular sieve with cost-effectiveness, facile synthesis, and tunable porosity. Its programmable mesoporous structure is achieved by precisely controlling the desilication-recrystallization kinetics. Tunable mesopores with precise diameters of 4–6 nm and 20–30 nm were fabricated by controlling cavity expansion through temporal modulation (2–32 h) of a time-dependent synthesis process. Detailed analysis of drug loading and release profiles revealed that although pore structure modification did not significantly alter drug loading efficiency (DLE), it induced a slight but consistent improvement in drug release rate as pore size increased. Systematic biocompatibility evaluation was conducted through an in vitro human colonic epithelial tissue model complemented by the KM mice in vivo studies. Histopathological analysis confirmed Silicalite-1-X caused minimal cytotoxicity and oxidative stress in healthy colon tissue, preserved mucus secretion, and showed no systemic toxicity. Furthermore, Doxorubicin (DOX) loaded Silicalite-1-X platform (Silicalite-1-DOX-X) exhibited dose-dependent cytotoxic efficacy against colorectal carcinoma in vitro models, confirming its anti-tumor therapeutic potential. Our findings provide a framework for engineering molecular sieves with tunable porosity and a platform for expanding their multifunctional applications in advanced materials.
A series of novel hierarchical ZSM-5 zeolite membranes with tunable mesopore sizes have been prepared successfully by using amphiphilic organosilane 3-[(trimethoxysilyl) propyl]octyldimethyl-ammonium chloride (TPOAC) as the mesogenous template and part of the Si source. The effects of several synthesis parameters, such as the TPOAC/SiO 2 ratio, synthesis temperature and crystallization time, on the microstructures and rejection performance of the hierarchical ZSM-5 zeolite membranes were systematically investigated. Multiple techniques, such as XRD , SEM, N 2 adsorption techniques, TEM, IR, 13 C MAS NMR and 29 Si MAS NMR were employed for the characterizations. The filtration of dextran in water shows that the membranes have molecular weight cutoff (MWCO) ranging from 9500 to 943,000, corresponding to the molecular size in the range of 4.5–37 nm. The sharp increase in the rejection of dextran with the increase of molecular weight indicated narrow pore size distribution of the membrane. These results show that the hierarchical mesoporous ZSM-5 zeolite membranes have a great potential for ultrafiltration with high performance.
危险品化学品经营许可证（带存储）