We put forward a large-area and cost-effective method to fabricate superhydrophobic coating by introducing in-situ functionalized nano-SiO2 into side-amino modified hydroxy-terminated polydimethylsiloxane （SA-HTPDMS...We put forward a large-area and cost-effective method to fabricate superhydrophobic coating by introducing in-situ functionalized nano-SiO2 into side-amino modified hydroxy-terminated polydimethylsiloxane （SA-HTPDMS） curing system. With the characterization using water contact angle （WCA） tester, Fourier transform infrared spectroscopy （FTIR）, scanning electron microscope （SEM）, atomic force microscopy （AFM） and simultaneous thermal analysis, the as-prepared coating displayed a tremendous WCA of 154.8±1°, sliding angle （SA） about 3.5° and stable self-cleaning property range from -10 to 80 ℃. It was also found that the synergistic effect of surface micro-nano hierarchical structure and chemical hydrophobicity, stability from matrix had made contributions to the superhydrophobicity and excellent heat resistance up to 300 ℃.展开更多
Amino-modified silica hydrogel(N-MSHG)was prepared by a simple sol-gel processing via the cocondensation of commercial silica sol with 3-aminopropyltrieoxysilane.Penicillin G acylase(PGA),a model enzyme,was covalently...Amino-modified silica hydrogel(N-MSHG)was prepared by a simple sol-gel processing via the cocondensation of commercial silica sol with 3-aminopropyltrieoxysilane.Penicillin G acylase(PGA),a model enzyme,was covalently immobilized onto the N-MSHG and then was used for the enzymatic synthesis of amoxicillin.The samples were characterized by Nitrogen sorption analysis,FT-IR and thermal gravimetric analysis(TGA).The results showed that the amino-modified gel was a mesoporous material with an average pore size of 12.64±0.17 nm.The immobilization process was efficient and the immobilized enzyme showed high catalytic efficiency.The yield of the synthesis of amoxicillin in aqueous media was 38%for 2.5 h.This sol-gel preparation is simple and shows prominent potential value in industrial processing.展开更多
Herein,the fabrication of cellulose acetate(CA)silica-based nanocomposite membranes via the dry-wetphase inversion procedure for water desalination was investigated.The modified and unmodified silicananoparticles(MSNP...Herein,the fabrication of cellulose acetate(CA)silica-based nanocomposite membranes via the dry-wetphase inversion procedure for water desalination was investigated.The modified and unmodified silicananoparticles(MSNPs and SNPs)were prepared by the sol-gel technique.The effect of the SNPs andMSNPs was investigated on the CA membrane's properties and their performance for water desalination.The CA nanocomposite membranes were characterized to study their structure,hydrophilicity,andmorphology.The fabricated nanocomposite membranes showed hydrophilic surface properties.Theperformance of reverse osmosis(RO)membranes was measured using a crossflow RO unit at 10 bar(1 bar=0.1 MPa).The membrane with 10 mg of SNPs enhanced permeate water flux compared to thepristine CA membrane by 1.6 L/(m2·h).The effect of MSNPs on the nanocomposites'performance waslower than their counterpart in the case of adding SNPs.The membrane with 30 mg of MSNPs showedthe highest permeate water flux among other nanocomposite membranes with a value oAQSf 35.7 L/(m2·h)at 24 bar.展开更多
基金Supported by National High Technology Research and Development ProgramofChina(863Program)(No.2003AA305920)
文摘We put forward a large-area and cost-effective method to fabricate superhydrophobic coating by introducing in-situ functionalized nano-SiO2 into side-amino modified hydroxy-terminated polydimethylsiloxane （SA-HTPDMS） curing system. With the characterization using water contact angle （WCA） tester, Fourier transform infrared spectroscopy （FTIR）, scanning electron microscope （SEM）, atomic force microscopy （AFM） and simultaneous thermal analysis, the as-prepared coating displayed a tremendous WCA of 154.8±1°, sliding angle （SA） about 3.5° and stable self-cleaning property range from -10 to 80 ℃. It was also found that the synergistic effect of surface micro-nano hierarchical structure and chemical hydrophobicity, stability from matrix had made contributions to the superhydrophobicity and excellent heat resistance up to 300 ℃.
文摘Amino-modified silica hydrogel(N-MSHG)was prepared by a simple sol-gel processing via the cocondensation of commercial silica sol with 3-aminopropyltrieoxysilane.Penicillin G acylase(PGA),a model enzyme,was covalently immobilized onto the N-MSHG and then was used for the enzymatic synthesis of amoxicillin.The samples were characterized by Nitrogen sorption analysis,FT-IR and thermal gravimetric analysis(TGA).The results showed that the amino-modified gel was a mesoporous material with an average pore size of 12.64±0.17 nm.The immobilization process was efficient and the immobilized enzyme showed high catalytic efficiency.The yield of the synthesis of amoxicillin in aqueous media was 38%for 2.5 h.This sol-gel preparation is simple and shows prominent potential value in industrial processing.
文摘Herein,the fabrication of cellulose acetate(CA)silica-based nanocomposite membranes via the dry-wetphase inversion procedure for water desalination was investigated.The modified and unmodified silicananoparticles(MSNPs and SNPs)were prepared by the sol-gel technique.The effect of the SNPs andMSNPs was investigated on the CA membrane's properties and their performance for water desalination.The CA nanocomposite membranes were characterized to study their structure,hydrophilicity,andmorphology.The fabricated nanocomposite membranes showed hydrophilic surface properties.Theperformance of reverse osmosis(RO)membranes was measured using a crossflow RO unit at 10 bar(1 bar=0.1 MPa).The membrane with 10 mg of SNPs enhanced permeate water flux compared to thepristine CA membrane by 1.6 L/(m2·h).The effect of MSNPs on the nanocomposites'performance waslower than their counterpart in the case of adding SNPs.The membrane with 30 mg of MSNPs showedthe highest permeate water flux among other nanocomposite membranes with a value oAQSf 35.7 L/(m2·h)at 24 bar.
