Production of free standing composite membranes or of patterned films after sol–gel reactions in an exponential layer-by-layer architecture

The amino functionalized magnesium phyllosilicate clay (AC) intercalated over PVA-Nafion hybrid nanocomposite membranes were prepared by sol-gel method. The free standing membranes were obtained by solution recasting. The composition of clay materials such as AC and montmorillonite (MMT) was varied between 2-10 wt.% with respect to PVA-Nafion content. The molecular interactions and surface morphology of nanocomposite membranes were investigated by FT-IR and SEM analyses respectively. The thermal and mechanical stabilities of nanocomposite membranes were studied using TGA and Nanoindentation techniques. For 6 wt. % AC/PVA-Nafion, TGA results showed no appreciable mass change up to 380 °C and hardness calculated from nanoindentation studies was nearly 30 % higher than the other compositions. An improved conductivity was obtained for 6 wt. % AC/PVA-Nafion (1.4×10-2 S/cm) compared to pure Nafion (1.2×10-2 S/cm) and PVA-Nafion and MMT/PVA-Nafion composite membranes. From these studies, we observed that 6 wt. % AC/PVA-Nafion membrane possessed a good conductivity with higher thermal and mechanical stabilities.

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Sulfonated poly(arylene ether sulfone) functionalized polysilsesquioxane hybrid membranes with enhanced proton conductivity

e-Polymers ◽

10.1515/epoly-2020-0048 ◽

2020 ◽

Vol 20 (1) ◽

pp. 430-442 ◽

Cited By ~ 2

Author(s):

Rajdeep Mukherjee ◽

Arun Kumar Mandal ◽

Susanta Banerjee

Keyword(s):

Proton Conductivity ◽

Sol Gel ◽

Composite Membranes ◽

Casting Technique ◽

Force Microscopy ◽

Arylene Ether ◽

Transmission Electron ◽

Uniform Dispersion ◽

Solution Casting Technique ◽

Sulfonated Poly

AbstractSulfopropylated polysilsesquioxane and –COOH containing fluorinated sulfonated poly(arylene ether sulfone) composite membranes (SPAES-SS-X) have been prepared via an in situ sol–gel reaction through the solution casting technique. The composite membranes showed excellent thermal and chemical stability, compared to the pristine SPAES membrane. The uniform dispersion of the sulfonated SiOPS nanoparticles on the polymer matrix was observed from the scanning electron microscope images. Atomic force microscopy and transmission electron microscopy images indicated significantly better phase-separated morphology and connectivity of the ionic domains of the composite membranes than the pristine SPAES membrane. The composite membranes showed considerable improvement in proton conductivity and oxidative stability than the pristine copolymer membrane under similar test conditions.

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Green strategy for the synthesis of mesoporous, free-standing MAl2O4 (M = Fe, Co, Ni, Cu) spinel films by sol–gel method

Materials Science and Engineering B ◽

10.1016/j.mseb.2021.115244 ◽

2021 ◽

Vol 271 ◽

pp. 115244

Author(s):

Gajanan B. Kunde ◽

Ganapati D. Yadav

Keyword(s):

Sol Gel ◽

Free Standing ◽

Gel Method ◽

Sol Gel Method ◽

Green Strategy

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Layer-by-layer self-assembly of PDDA/PWA–Nafion composite membranes for direct methanol fuel cells

Chemical Communications ◽

10.1039/b912779h ◽

2010 ◽

Vol 46 (9) ◽

pp. 1434 ◽

Cited By ~ 69

Author(s):

Meng Yang ◽

Shanfu Lu ◽

Jinlin Lu ◽

San Ping Jiang ◽

Yan Xiang

Keyword(s):

Fuel Cells ◽

Self Assembly ◽

Direct Methanol Fuel Cells ◽

Composite Membranes ◽

Layer By Layer ◽

Direct Methanol ◽

Methanol Fuel Cells

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Reinforced Composite Membranes Based on Expanded Polytetrafluoroethylene Skeletons Modified by a Surface Sol–Gel Process for Fuel Cell Applications

Energy & Fuels ◽

10.1021/acs.energyfuels.1c01205 ◽

2021 ◽

Author(s):

Lei Liu ◽

Yizhe Li ◽

Rui Qiao ◽

Yijing Xing ◽

Haibin Li

Keyword(s):

Fuel Cell ◽

Sol Gel ◽

Composite Membranes ◽

Expanded Polytetrafluoroethylene ◽

Reinforced Composite ◽

Sol Gel Process

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Comparative bioelectrochemical study of two types of myoglobin layer-by-layer films with alumina: Vapor-surface sol–gel deposited Al2O3 films versus Al2O3 nanoparticle films

Electrochimica Acta ◽

10.1016/j.electacta.2006.04.002 ◽

2006 ◽

Vol 52 (1) ◽

pp. 123-132 ◽

Cited By ~ 11

Author(s):

Wei Guo ◽

Haiyun Lu ◽

Naifei Hu

Keyword(s):

Sol Gel ◽

Layer By Layer ◽

Nanoparticle Films ◽

Al2o3 Nanoparticle ◽

Al2o3 Films

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Fabrication and Microstructure of ZnO-TiO2 Composite Membranes by a Reverse Micelle and Sol-Gel Processing

Materials Science Forum ◽

10.4028/www.scientific.net/msf.510-511.786 ◽

2006 ◽

Vol 510-511 ◽

pp. 786-789 ◽

Cited By ~ 4

Author(s):

Dong Sik Bae ◽

Byung Ik Kim ◽

Kyong Sop Han

Keyword(s):

Particle Size ◽

Reverse Micelle ◽

Porous Alumina ◽

Sol Gel ◽

Average Particle Size ◽

Composite Membranes ◽

Dip Coating ◽

Narrow Particle Size Distribution ◽

Average Particle ◽

Alumina Support

ZnO-TiO2 nanoparticles were synthesized by a reverse micelle and sol-gel process. The average particle size of the colloid was below 30 nm and well dispersed in the solution. ZnOTiO2 composite membranes were fabricated by using the dip-coating method on a porous alumina support. ZnO-TiO2 composite membranes showed a crack-free microstructure and narrow particle size distribution even after the heat treatment up to 600°C. The average particle size of the membrane was 30-40nm, and the pore size of ZnO-TiO2 composite membrane was below 10 nm.

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Synthesis of Nanoparticulate Silica Composite Membranes by the Pressurized Sol-Gel Technique

Journal of the American Ceramic Society ◽

10.1111/j.1151-2916.1994.tb04554.x ◽

1994 ◽

Vol 77 (12) ◽

pp. 3093-3098 ◽

Cited By ~ 19

Author(s):

Sang H. Hyun ◽

Beom S. Kang

Keyword(s):

Sol Gel ◽

Composite Membranes ◽

Silica Composite ◽

Gel Technique

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Synthesis and Characterization of Zn Oxide Hexagonal Nano-Pole Films on Quartz Glass Substrate

International Journal of Chemical Reactor Engineering ◽

10.2202/1542-6580.2051 ◽

2009 ◽

Vol 7 (1) ◽

Author(s):

Jie Chen ◽

Jun Wang

Keyword(s):

Growth Mechanism ◽

Quartz Glass ◽

Photoelectron Spectroscopy ◽

Glass Substrate ◽

Sol Gel ◽

Layer Growth ◽

Layer By Layer ◽

Quartz Glass Substrate ◽

Wurtzite Phase ◽

X Ray

Hexagon-shaped Zn oxide nano-pole films with terraces and steps have been successfully fabricated by means of a combined approach involving sol-gel process, high-temperature heat treatment, and the hydrothermal method. The surface chemistry and morphological features of the films were characterized by means of x-ray photoelectron spectroscopy and scanning electron microcopy. All the diffraction peaks in x-ray diffraction pattern match with those of the hexagonal wurtzite phase of Zn oxide. Transmittance measurements show that the optical transmittance of the sample synthesized at 520°C on quartz glass substrate is the highest, reaching about 65% in the visible-light region. Based on the detailed structural characterization and the nucleation-growth kinetics, we find that the whole crystallization process of wurtzite Zn oxide nano-poles includes nanocatalysis and layer-by-layer growth mechanism. The present study provides an important understanding of the growth mechanism for nano-pole synthesis of Zn oxide and related materials.

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