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MATERIALS LETTERS · 2013 · IF 2.224

Fabrication of ordered honeycomb porous polyvinyl chloride (PVC) films by breath figures method

Chun-Xia Liu,Wan-Zhong Lang,Bin-Bin Shi,Ya-Jun Guo

In this research, the ordered honeycomb-patterned polyvinyl chloride (PVC) porous films were first fabricated with hydrophilic tetrahydrofurane (THF) as a solvent by the “Breath figures” (BFs) method. The effects of polymer concentration, polymerization degree of PVC, and air humidity on the formation of PVC films were investigated. The experimental results indicate that the increase of polymer concentration leads to the decrease of the hole size of the resultant films, and even makes the porous structure disappear. Besides, the porous films can be easily fabricated with higher polymerization degree of PVC at 40 mg mL −1 . Increasing air humidity is advantageous to form well-ordered porous PVC films with larger hole size.

CAS / MDL: 7647-14-5 109-99-9 7447-40-7 7647-15-6

研究领域: 材料科学 · 高分子化学

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ADVANCED FUNCTIONAL MATERIALS · 2024 ·Vol. 34 ·期 32 ·2314581 · IF 18.5

Capillary Condensation Mediated Fluidic Straining for Enhanced Bacterial Inactivation

Yuanyuan Zhao,Hubao A,Yuk Ha Cheung,Yintung Lam,Jiayue Tang,Han Li,Zhibing Yang,John Haozhong Xin

Biomaterials capable of continuously inactivating pathogens are essential for suppressing transmission of infectious diseases, such as epidemic cerebrospinal meningitis and pulmonary tuberculosis. Here, capillary condensation of air moisture within nano-confined spaces between superhydrophilic rigid nanorods is shown and target microbiology spontaneously stretch and inactivate aerosolized microorganisms. Specifically, the negative Gaussian curvature-shaped water condensate causes fluidic straining, comprising surface tension and Laplace pressure, strong enough to deform and eliminate the selected bacteria. Plate counting quantifies the sharply reduced contact-killing period for superhydrophilic and bare nanorods (6 vs 100 min for E. coli , 20 vs 120 min for S. aureus ) under relative humidity of 70%. Theoretical calculations and experimental studies indicate increased mechanical straining and mechano-bactericidal by improving air moisture content. To further illustrate utility, long-term antibacterial medical masks are fabricated by integrating such nanorods onto commercial fabrics. Collectively, these findings highlight the immense potential of capillary condensation-induced fluidic straining as an eco-friendly, broad-spectrum, and highly efficient antibacterial strategy.

CAS / MDL: 7647-14-5 141-43-5 7550-35-8 109-86-4 127-08-2 584-08-7 7447-40-7 7681-11-0 7786-30-3

研究领域: 生物医学工程 · 微生物学 · 材料科学

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Fabrication of ordered honeycomb porous polyvinyl chloride (PVC) films by breath figures method

Capillary Condensation Mediated Fluidic Straining for Enhanced Bacterial Inactivation