Enhanced proton conductivity by the influence of modified montmorillonite on poly (vinyl alcohol) based blend composite membranes

2016 ◽  
Author(s):  
P. Bahavan Palani ◽  
K. Sainul Abidin ◽  
R. Kannan ◽  
S. Rajashabala ◽  
M. Sivakumar
Keyword(s):  
Proton Conductivity ◽  
Vinyl Alcohol ◽  
Composite Membranes ◽  
Poly Vinyl Alcohol ◽  
Modified Montmorillonite

scholarly journals Hybrid Composite Membrane of Phosphorylated Chitosan/Poly (Vinyl Alcohol)/Silica as a Proton Exchange Membrane

Membranes ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 675
Author(s):  
Nur Adiera Hanna Rosli ◽  
Kee Shyuan Loh ◽  
Wai Yin Wong ◽  
Tian Khoon Lee ◽  
Azizan Ahmad
Keyword(s):  
Proton Conductivity ◽  
Composite Membrane ◽  
Vinyl Alcohol ◽  
Proton Exchange Membrane ◽  
Mechanical Stability ◽  
Composite Membranes ◽  
Proton Exchange ◽  
Inorganic Filler ◽  
Poly Vinyl Alcohol ◽  
Filler Concentration

Chitosan is one of the natural biopolymers that has been studied as an alternative material to replace Nafion membranes as proton change membranes. Nevertheless, unmodified chitosan membranes have limitations including low proton conductivity and mechanical stability. The aim of this work is to study the effect of modifying chitosan through polymer blending with different compositions and the addition of inorganic filler on the microstructure and physical properties of N-methylene phosphonic chitosan/poly (vinyl alcohol) (NMPC/PVA) composite membranes. In this work, the NMPC biopolymer and PVA polymer are used as host polymers to produce NMPC/PVA composite membranes with different compositions (30–70% NMPC content). Increasing NMPC content in the membranes increases their proton conductivity, and as NMPC/PVA-50 composite membrane demonstrates the highest conductivity (8.76 × 10−5 S cm−1 at room temperature), it is chosen to be the base membrane for modification by adding hygroscopic silicon dioxide (SiO2) filler into its membrane matrix. The loading of SiO2 filler is varied (0.5–10 wt.%) to study the influence of filler concentration on temperature-dependent proton conductivity of membranes. NMPC/PVA-SiO2 (4 wt.%) exhibits the highest proton conductivity of 5.08 × 10−4 S cm−1 at 100 °C. In conclusion, the study shows that chitosan can be modified to produce proton exchange membranes that demonstrate enhanced properties and performance with the addition of PVA and SiO2.

scholarly journals Single and binary protein electroultrafiltration using poly(vinyl-alcohol)-carbon nanotube (PVA-CNT) composite membranes

PLoS ONE ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. e0228973
Author(s):  
Raymond Yeung ◽  
Xiaobo Zhu ◽  
Terence Gee ◽  
Ben Gheen ◽  
David Jassby ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Vinyl Alcohol ◽  
Composite Membranes ◽  
Poly Vinyl Alcohol

Preparation of electrospun silver/poly(vinyl alcohol) fibrous membranes and characterization of the effect of sterilization processes on the antibacterial activity

2020 ◽  
pp. 152808372091334 ◽  
Author(s):  
Wen-Cheng Chen ◽  
Chia-Ying Ko ◽  
Kai-Chi Chang ◽  
Chih-Hua Chen ◽  
Dan-Jae Lin
Keyword(s):  
Vinyl Alcohol ◽  
Antimicrobial Agents ◽  
Uv Light ◽  
Silver Ions ◽  
Composite Membranes ◽  
Antibacterial Activities ◽  
Poly Vinyl Alcohol ◽  
Preheat Treatment ◽  
Fibrous Membranes

Silver ions (Ag+) and silver nanoparticles (AgNPs) are effective antimicrobial agents that act against a broad spectrum of bacteria. The releasing quantitation of free Ag+ is exclusively responsible for the biological toxicity, while limiting the free Ag+ in AgNPs or in polymers would largely ease the conditions. In this study, the different concentrations of silver nitrate (AgNO3) in poly(vinyl alcohol) (PVA) and an optional preheat treatment on the spinning solution before electrospinning to form the Ag+/AgNPs/PVA fibrous membranes through electrospinning technology were investigated. The morphologies, AgNPs dispersity within the PVA matrix, and the sterilizations (UV irradiation and autoclave) for Ag+/AgNPs/PVA fibrous membranes were characterized. The antibacterial activities of Ag/PVA composite membranes combined with the in-house prepared light-cured resin were also investigated. Results showed that the AgNPs/PVA fibrous membranes with antibacterial capability can be produced with the addition of at least 5 wt.% of AgNO3 to PVA. The antibacterial activities of Ag content in the PVA matrix were increased in the high presence of Ag. Noteworthy, the antibacterial enhancing effect was observed for the spinning solution groups after preheating treatment at 100°C for 1 h. The result suggests that Ag/PVA fibrous membranes sterilized by autoclave hindered antibacterial effectiveness due to the significant particle size changes in the generation of large-sized AgNPs. Nevertheless, the direct application of UV light irradiation to Ag/PVA fibrous membranes preserves their active antibacterial profile against Staphylococcus aureus and Escherichia coli. We also demonstrated that these designed AgNPs/PVA composite membranes can equip the resin with an active antibacterial capability, could benefit from the prevented bacteria breeding in microleakages and thus further reduce the possibility for secondary caries.

Sign in / Sign up

Export Citation Format

Share Document