scholarly journals Fabrication of superhydrophobic composite coating based on fluorosilicone resin and silica nanoparticles

2018 ◽  
Vol 5 (7) ◽  
pp. 180598 ◽  
Author(s):  
Xiaoming Wang ◽  
Xingeng Li ◽  
Qingquan Lei ◽  
Yaping Wu ◽  
Wenjing Li
Keyword(s):  
Silica Nanoparticles ◽  
Composite Coating ◽  
Room Temperature ◽  
Silica Content ◽  
Superhydrophobic Coating ◽  
Polymer Model ◽  
Modified Silica ◽  
Sliding Angle ◽  
Water Contact ◽  
Modified Silica Nanoparticles

Composite superhydrophobic coating built with film former and filler is attracting much attention for its facile and convenient fabrication, but significant limitations and disadvantages still remain. In this paper, a composite superhydrophobic coating is introduced which can be cured at room temperature and made by dispersing modified silica nanoparticles with 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane in fluorosilicone resin. Silica content and dispersion time showed obvious influences on the morphology and topography of composite coating by reuniting dispersed nanoparticles to form peaks on the surface. Excessively large distances between these peaks would decrease water contact angle value. Increasing slope of peaks, appropriate distance between peaks and decreasing diameter size of peaks would diminish sliding angle value. Formation mechanism of the composite coating based on fluorosilicone resin and modified nanoparticles was explained using interpenetrating polymer model.

scholarly journals Surge-Resistant Nanocomposite Enameled Wire Using Silica Nanoparticles with Binary Chemical Compositions on the Surface

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Jeseung Yoo ◽  
Yongbeom Kim ◽  
Suyong Kwon ◽  
Joohyun Lee ◽  
Young-Soo Seo
Keyword(s):  
Silica Nanoparticles ◽  
Silica Surface ◽  
Partial Discharge ◽  
Silica Content ◽  
Viscosity Measurement ◽  
Chemical Compositions ◽  
Modified Silica ◽  
Modified Silica Nanoparticles ◽  
Surface Modified ◽  
Wire Fabrication

We developed polyesterimide (PEI) nanocomposite enameled wires using surface-modified silica nanoparticles with binary chemical compositions on the surface. The modification was done using silanes assisted by ultrasound, which facilitated high density modification. Two different trimethoxysilanes were chosen for the modification on the basis of resemblance of chemical compositions on the silica surface to PEI varnish. The surface-modified silica was well dispersed in PEI varnish, which was confirmed by optical observation and viscosity measurement. The glass transition temperature of the silica-PEI nanocomposite increased with the silica content. The silica-dispersed PEI varnish was then used for enameled wire fabrication. The silica-PEI nanocomposite enameled wire exhibited a much longer lifetime compared to that of neat PEI enameled wire in partial discharge conditions.

Construction of a superhydrophobic coating using triethoxyvinylsilane-modified silica nanoparticles

2018 ◽  
Vol 35 (5) ◽  
pp. 418-425 ◽  
Author(s):  
Zhansheng Wang ◽  
Weizhong Yang ◽  
Feng Sun ◽  
Ping Zhang ◽  
Yi He ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Superhydrophobic Coating ◽  
Modified Silica ◽  
Modified Silica Nanoparticles

scholarly journals Modified Silica Incorporating into PDMS Polymeric Membranes for Bioethanol Selection

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Ping Peng ◽  
Yongqiang Lan ◽  
Juxiang Luo
Keyword(s):  
Silica Nanoparticles ◽  
Contact Angles ◽  
Polymeric Membranes ◽  
Mixed Matrix Membranes ◽  
Coupling Agents ◽  
Silane Coupling Agents ◽  
Modified Silica ◽  
Water Contact ◽  
Fumed Silica Nanoparticles ◽  
Modified Silica Nanoparticles

In this work, polydimethylsiloxane (PDMS) polymeric membranes were fabricated by incorporating fumed silica nanoparticles which were functionalized with two silane coupling agents—NH2(CH2)3Si(OC2H5)3(APTS) and NH2(CH2)2NH(CH2)3Si(OC2H5)3(TSED)—for selective removal of ethanol from aqueous solutions via pervaporation. It was demonstrated that large agglomerates were not observed indicating the uniform distribution of modified silica throughout the PDMS matrices. It is noted that the ethanol diffusivity and the water contact angles were both increased remarkably, being beneficial to the preferential permeation of ethanol through the membranes. The pervaporation results showed that the addition of the two types of modified silica nanoparticles dramatically enhanced both the permeability and selectivity of hybrid membranes. Compared to APTS, silica modified by TSED at the concentration of 4 wt. % resulted in the optimum pervaporation membranes with the maximum separation factor of 12.09 and the corresponding permeation flux of approximately 234.0 g·m−2·h−1in a binary aqueous mixture at 40°C containing 10 wt. % ethanol. The observation will benefit the choice of coupling agents to improve the compatibility between hydrophilic fillers and hydrophobic polymers in preparing mixed matrix membranes.

scholarly journals Anti-Fouling Performance of Mixed Matrix PVDF Membranes with Mono-Hydroxyl Poly(dimethylsiloxane) (PDMS-OH) Grafted Silica Nanoparticles

2020 ◽  
Author(s):  
MUAYAD AL-SHAELI ◽  
Stefan J. D. Smith ◽  
Shanxue Jiang ◽  
Huanting Wang ◽  
Kaisong Zhang ◽  
...  
Keyword(s):  
Pore Size ◽  
Silica Nanoparticles ◽  
Membrane Fouling ◽  
Pure Water ◽  
Water Flux ◽  
Rejection Rate ◽  
Silica Content ◽  
Mixed Matrix ◽  
Modified Silica ◽  
Water Contact

In this study, we investigate the use of surface-modified silica nanoparticles to improve the anti-fouling performance of PVDF ultrafiltration membranes. Here, fouling resistant nanoparticles were prepared by grafting monohydroxy-polydimethylsiloxane onto the surface of silica nanoparticles using Steglich esterification. The mixed matrix PVDF membranes were prepared at a range of nanoparticle concentrations (0, 1.6, 3.2, 6.3, and 11.8%) to understand how PDMS modified silica content affected membrane performance. The resulting hybrid membranes were characterised using a range of techniques including scanning electron microscopy (SEM), water contact angle (CA), porosity, and pore size measurements, in order to determine how morphological features of the nanocomposite membranes affected fouling and pure water flux. Embedding silica nanoparticles resulted in a significant reduction in membrane fouling, including lower protein adsorption and a flux recovery ratio of 97 %. Although water flux was reduced by the addition of nanoparticles, the change in the porosity, mean pore size and the hydrophilicity of the membrane caused the rejection rate to be increased significantly. Together, these results are of particular benefit to the ultrafiltration industry, where improved antifouling and flux recovery can help reduce operating and maintenance costs in these membrane processes.<br><br>

scholarly journals Anti-Fouling Performance of Mixed Matrix PVDF Membranes with Mono-Hydroxyl Poly(dimethylsiloxane) (PDMS-OH) Grafted Silica Nanoparticles

2020 ◽  
Author(s):  
MUAYAD AL-SHAELI ◽  
Stefan J. D. Smith ◽  
Shanxue Jiang ◽  
Huanting Wang ◽  
Kaisong Zhang ◽  
...  
Keyword(s):  
Pore Size ◽  
Silica Nanoparticles ◽  
Membrane Fouling ◽  
Pure Water ◽  
Water Flux ◽  
Rejection Rate ◽  
Silica Content ◽  
Mixed Matrix ◽  
Modified Silica ◽  
Water Contact

In this study, we investigate the use of surface-modified silica nanoparticles to improve the anti-fouling performance of PVDF ultrafiltration membranes. Here, fouling resistant nanoparticles were prepared by grafting monohydroxy-polydimethylsiloxane onto the surface of silica nanoparticles using Steglich esterification. The mixed matrix PVDF membranes were prepared at a range of nanoparticle concentrations (0, 1.6, 3.2, 6.3, and 11.8%) to understand how PDMS modified silica content affected membrane performance. The resulting hybrid membranes were characterised using a range of techniques including scanning electron microscopy (SEM), water contact angle (CA), porosity, and pore size measurements, in order to determine how morphological features of the nanocomposite membranes affected fouling and pure water flux. Embedding silica nanoparticles resulted in a significant reduction in membrane fouling, including lower protein adsorption and a flux recovery ratio of 97 %. Although water flux was reduced by the addition of nanoparticles, the change in the porosity, mean pore size and the hydrophilicity of the membrane caused the rejection rate to be increased significantly. Together, these results are of particular benefit to the ultrafiltration industry, where improved antifouling and flux recovery can help reduce operating and maintenance costs in these membrane processes.<br><br>

Sodium Chloride Modified Silica Nanoparticles as a Non-Viral Vector with a High Efficiency of DNA Transfer into Cells

2003 ◽  
Vol 3 (3) ◽  
pp. 273-279 ◽  
Author(s):  
Yuxiang Chen ◽  
Zhigang Xue ◽  
Duo Zheng ◽  
Kun Xia ◽  
Yanzhong Zhao ◽  
...  
Keyword(s):  
Sodium Chloride ◽  
Silica Nanoparticles ◽  
High Efficiency ◽  
Viral Vector ◽  
Dna Transfer ◽  
Modified Silica ◽  
Modified Silica Nanoparticles

Cationic chitosan‐modified silica nanoparticles for oral delivery of protein vaccine

2021 ◽  
Author(s):  
Xi Wu ◽  
Muhammad Asim Farooq ◽  
Tiantian Li ◽  
Tianjiao Geng ◽  
Perpeuta Takunda Kutoka ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Oral Delivery ◽  
Protein Vaccine ◽  
Modified Silica ◽  
Modified Silica Nanoparticles

One-pot synthesis and application of novel amino-functionalized silica nanoparticles using guanidine as amino group

2016 ◽  
Vol 40 (10) ◽  
pp. 8444-8450 ◽  
Author(s):  
Feng Guodong ◽  
Guan Mingming ◽  
Lai Qi ◽  
Mi Hongyu ◽  
Li Guanghua ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Silica Nanoparticles ◽  
Amino Group ◽  
Functionalized Silica ◽  
Henry Reaction ◽  
Modified Silica ◽  
One Pot ◽  
One Pot Synthesis ◽  
Modified Silica Nanoparticles ◽  
Functionalized Silica Nanoparticles

The preparation of modified silica nanoparticles with guanidine was developed and used to catalyze the Henry reaction and fix quantum dots.

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