scholarly journals Sweetening of Natural Gas through Hollow Silica Nanoparticles Embedded Hydroxyethyl Cellulose Membrane

2018 ◽  
Vol 15 (3) ◽  
pp. 256-262
Author(s):  
Mallikarjunagouda B. Patil ◽  
Amshumali M. K
Keyword(s):  
Gas Permeability ◽  
Operating Conditions ◽  
Hydroxyethyl Cellulose ◽  
Cellulose Membrane ◽  
Membrane Thickness ◽  
Membrane Gas Separation ◽  
Hollow Silica ◽  
Feed Pressure ◽  
Hollow Silica Nanoparticles ◽  
Sorption Effect

Membrane gas separation technique is a promising technique for separation of gases. Nanoparticles (NPs) of hollow spherical silica were synthesized by the hydrolysis and condensation of tetramethylorthosilicate (TMOS). The nanocomposite membranes were prepared by dispersing hollow silica in hydroxyethylcellulose (HEC) polymeric solution and were cast as membranes by solution casting-solvent evaporation procedure. The % loading of NP’s in membrane varied from 0.5 to 2 Wt. %. The effects of experimental parameters such as gas permeability and selectivity at constant pressure were measured for gas transport properties for the prepared membranes. Under constant operating conditions of feed pressure (4.0 MPa) and membrane thickness (50 μm), the CO2 permeability was determined to be in the range 1790-3620 Barrer for nanocomposite membrane from 0.5 to 2 Wt. %, while selectivity declined from 3.7 to 3.1 due to plasticization. This made us to come to the conclusion that the membrane has a double mode of sorption effect. The membranes were characterized with FTIR to confirm the formation of compound and with SEM to study the distribution of nanoparticles in the membrane matrix.

Effect of Operating Parameters on the DMFC Performance

2004 ◽  
Vol 2 (2) ◽  
pp. 81-85 ◽  
Author(s):  
Guo-Bin Jung ◽  
Ay Su ◽  
Cheng-Hsin Tu ◽  
Fang-Bor Weng
Keyword(s):  
Concentration Polarization ◽  
Solution Concentration ◽  
Open Circuit ◽  
Methanol Solution ◽  
Operating Conditions ◽  
Cell Performance ◽  
Membrane Electrode ◽  
Membrane Thickness ◽  
Methanol Crossover ◽  
Cell Temperature

Methanol crossover largely affects the efficiency of power generation in the direct methanol fuel cell. As the methanol crosses over through the membrane, the methanol oxidizes at the cathode, resulting in low fuel utilization and in a serious overpotential loss. In this study, the commercial membrane electrode assemblies (MEAs) are investigated with different operating conditions such as membrane thickness, cell temperature, and methanol solution concentration. The effects of these parameters on methanol crossover and power density are studied. With the same membrane, increasing the cell temperature promotes the cell performance as expected, and the lower methanol concentration causes the concentration polarization effects, thus resulting in lower cell performance. Although higher methanol solution concentration can overcome the concentration polarization, a serious methanol crossover decreases the cell performance at high cell temperature. In this study, the open circuit voltage (OCV) is inversely proportional to methanol solution concentration, and is proportional to membrane thickness and cell temperature. Although increasing membrane thickness lowers the degree of methanol crossover, on the other hand, the ohmic resistance increases simultaneously. Therefore, the cell performance using Nafion 117 as membrane is lower than that of Nafion 112. In addition, the performance of the MEA made in our laboratory is higher than the commercial product, indicating the capability of manufacturing MEA is acceptable.

Hollow Silica Nanoparticles Penetrate the Peripheral Nerve and Enhance the Nerve Blockade from Tetrodotoxin

Nano Letters ◽  
2017 ◽  
Vol 18 (1) ◽  
pp. 32-37 ◽  
Author(s):  
Qian Liu ◽  
Claudia M. Santamaria ◽  
Tuo Wei ◽  
Chao Zhao ◽  
Tianjiao Ji ◽  
...  
Keyword(s):  
Peripheral Nerve ◽  
Silica Nanoparticles ◽  
Hollow Silica ◽  
Nerve Blockade ◽  
Hollow Silica Nanoparticles

Empirical Model of Operating Temperature and Pressure Effect towards Pure and Binary O2/ N2 Gas Permeability in Polysulfone Membrane

2018 ◽  
Vol 777 ◽  
pp. 238-244
Author(s):  
Serene Sow Mun Lock ◽  
Kok Keong Lau ◽  
Irene Sow Mei Lock ◽  
Azmi Mohd Shariff ◽  
Yin Fong Yeong ◽  
...  
Keyword(s):  
Empirical Model ◽  
Membrane Separation ◽  
Gas Permeability ◽  
Economic Assessment ◽  
Operating Conditions ◽  
Effect Of Temperature ◽  
Polysulfone Membrane ◽  
Wide Range ◽  
Temperature And Pressure ◽  
Membrane Permeance

Oxygen (O2) enriched air combustion via adaption of polymeric membranes has been proposed to be a feasible alternative to increase combustion proficiency while minimizing the emission of greenhouse gases into the atmosphere. Nonetheless, majority of techno-economic assessment on the O2 enriched combustion evolving membrane separation process are confined to assumption of constant membrane permeance. In reality, it is well known that membrane permeance is highly dependent upon the temperature and pressure to which it is operated. Therefore, in this work, an empirical model, which includes the effect of temperature and pressure to permeance, has been evaluated based on own experimental work using polysulfone membrane. The empirical model has been further validated with published experimental results. It is found that the model is able to provide an excellent characterization of the membrane permeance across a wide range of operating conditions for both pure and binary gas with determination coefficient of minimally 0.99.

Novel fabrication of stable Pickering emulsion and latex by hollow silica nanoparticles

2019 ◽  
Vol 553 ◽  
pp. 83-90 ◽  
Author(s):  
Yan Bao ◽  
Yuanxia Zhang ◽  
Pan Liu ◽  
Jianzhong Ma ◽  
Wenbo Zhang ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Pickering Emulsion ◽  
Hollow Silica ◽  
Hollow Silica Nanoparticles
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