☆ 4.7 Article

A combined interfacial polymerization and in-situ sol-gel strategy to construct composite nanofiltration membrane with improved pore size distribution and anti-protein-fouling property

JOURNAL OF MEMBRANE SCIENCE (2021)

期刊

JOURNAL OF MEMBRANE SCIENCE

卷 623, 期 -, 页码 -

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ELSEVIER

DOI: 10.1016/j.memsci.2021.119097

关键词

Nanofiltration membrane; Membrane fabrication; Pore size distribution; Anti-protein-fouling; Tetraethyl orthosilicate (TEOS)

类别

Engineering, Chemical Polymer Science

资金

National Natural Science Foundation of China (NNSFC) [21978275]
Key Research and Development Program of Zhejiang Province [2021C03172]
National Key Research and Development Program of China [2020YFC1909402]

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摘要

The study proposed a novel combined interfacial polymerization (IP) and in-situ sol-gel strategy to fabricate composite nanofiltration membrane with narrow pore size distribution, enhancing membrane perm-selectivity and protein fouling resistance. The addition of TEOS in the interfacially synthesized selective separation layer was effective in tuning the mean pore diameter and narrowing the pore size distribution. Compared to membranes fabricated by only IP technique, the membranes fabricated by the combined IP and sol-gel technique showed higher water permeability and rejection ratio, indicating improved performance.

Pore size distribution is crucial for the application of nanofiltration membrane in size-selective separation of industrial fluids. In this work, a novel combined interfacial polymerization (IP) and in-situ sol-gel strategy was proposed to fabricate composite nanofiltration membrane with narrow pore size distribution. Aqueous solution of piperazine and polyvinyl alcohol (PVA) was employed to perform interfacial polymerization with organic solution of trimesoyl chloride and tetraethyl orthosilicate (TEOS) on porous support. The non-reactive additive TEOS within the interfacially synthesized selective separation layer was then employed to perform sol-gel. The space-limited hydrolysis and condensation of TEOS molecules and their chemical bonding with PVA molecules were confirmed by analyzing membrane physico-chemical property and were found to be effective in tuning mean pore diameter, narrowing the pore size distribution and thus enhancing membrane perm-selectivity. Compared to those of membrane PA1 with similar mean pore size fabricated by only IP technique, the water permeability and rejection ratio of PEG1000 to raffinose (R-PEG1000/R-raffinose) of membrane PA-TEOS0.5 fabricated by combined IP and sol-gel technique were higher by 25.0 and 20.1%, respectively. Moreover, static adsorption and dynamic deposition tests using aqueous bovine serum albumin solution proved that in-situ sol-gel process could endow the membrane with better protein fouling resistance.

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Breakdown-Voltage Degradation Under AC Stress of Thick SiO2 Capacitors for Galvanic Insulation

Federico Giuliano, Susanna Reggiani, Elena Gnani, Antonio Gnudi, Mattia Rossetti, Riccardo Depetro

Summary: Recently, it has been found that there is a significant difference in the breakdown of thick amorphous silicon-dioxide capacitors for galvanic insulation under dc and ac stresses. The dominant mechanism is believed to be impact-ionization generation for thicknesses ranging from about 1 to 15 μm. The breakdown voltage is significantly degraded under ac stress, which requires a focused TCAD-based investigation to fully comprehend the involved physical mechanisms. Accurate TCAD predictions of the measured leakage current help validate the proposed model and provide a detailed understanding of the device breakdown regime.

IEEE TRANSACTIONS ON ELECTRON DEVICES (2023)