Hydrophilic ePTFE-Based Composite Membranes for PEMFCs

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Jinjun Shi ◽  
Bor Jang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fuel Cell ◽  
Composite Membrane ◽  
Dimensional Stability ◽  
Composite Membranes ◽  
Proton Exchange ◽  
Equivalent Weight ◽  
Scanning Electron Microscopy Micrographs ◽  
Scanning Electron

A hydrophilic expanded poly(tetrafluoroethylene) (ePTFE) based composite membrane was prepared and tested for proton exchange fuel cell applications. The composite membrane was prepared by impregnating hydrophilic ePTFE membrane with 5% Nafion solution (equivalent weight=1000). This new composite membrane showed higher water uptake (12.7%) than that of normal hydrophobic ePTFE based composite membrane (6.3%) and better proton conductivity. Scanning electron microscopy micrographs showed that the hydrophilic ePTFE based membrane can easily form a dense composite membrane while hydrophobic ePTFE based composite membranes tend to have micropores inside. The hydrophilic ePTFE based composite membrane showed better thermal and dimensional stability than recast Nafion membrane.

Identification of human hookworm in failed-treatment cases using Chinese hamsters (Cricetulus griseus) and scanning electron microscopy

1991 ◽  
Vol 65 (1) ◽  
pp. 67-72 ◽  
Author(s):  
A. C. Evans ◽  
T. J. M. Daly ◽  
M. B. Markus
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cricetulus Griseus ◽  
Scanning Electron Microscopy Micrographs ◽  
Necator Americanus ◽  
Points Of Interest ◽  
Chinese Hamsters ◽  
Single Animal ◽  
Small Intestines ◽  
Scanning Electron

ABSTRACTAn attempt was made to identify the human hookworm involved in failed-treatment cases using abnormal hosts and scanning electron microscopy. Thirty-seven, 2 to 6 month old Chinese hamsters (Cricetulus griseus) from a closed, outbred, conventional colony, were each given between 20 and 120 filariform larvaeper os. The larvae were cultured from faeces from mebendazole (Vermox®) 500 mg single-dose, failed-treatment cases living in the lowveld farming area of the Transvaal Province, South Africa. About 60 to 78 days after inoculation, the animals were killed and adult worms were removed from their small intestines. Eleven (30%) of the 37 hamsters harboured a total of 31 adult worms (19 males and 12 females), while 26 hamsters were refractory to infection. The greatest number of worms recovered from a single animal was six. A total of 27 worms (17 males and 10 females) were subjected to examination by scanning electron microscopy. Micrographs showed male and female worms to be morphologically all of theNecator americanusspecies, as identified by a pair of ventral and dorsal cutting plates, a dorsal tooth and the fused terminus of spicules in the male bursa. The transverse cuticular striations were distinct and smooth. Several points of interest arose from the results of this study and are discussed.

Chemical Preparation and Characterizationof Polypyrrole-Polylactic Acid Conductive Composite Membranes

2011 ◽  
Vol 335-336 ◽  
pp. 187-190
Author(s):  
Jian Jun Chen ◽  
Ji Ying Men
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Polylactic Acid ◽  
Direct Current ◽  
Chemical Method ◽  
Composite Membranes ◽  
Observation Time ◽  
Chemical Preparation ◽  
Ft Ir ◽  
Scanning Electron

Abstract: Conductive polypyrrole(PPy)-polylactic Acid(PLA) composite membranes are prepared with chemical method. Membranes have been characterized by Fouier transform infrared spectroscopic(FT-IR) and scanning electron microscopy （SEM).The conductive stability of membranes has been measured by home-made multiwell direct current electrical stimulating system. The results show PPy nanparticals network embeds in PLA matrix and the conductive stability of membranes sustains in the range of 28μA~35μA between the observation time of 560h to 1146h.

Facile Preparation of Well-Dispersed GO-SPEEK Composite Membranes by Electrospun for Fuel Cell Applications

2015 ◽  
Vol 1735 ◽  
Author(s):  
Xu Liu ◽  
Xiaoyu Meng ◽  
Chuanming Shi ◽  
Jiangbei Huo ◽  
Ziqing Cai ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Proton Conductivity ◽  
Composite Membrane ◽  
Composite Membranes ◽  
Proton Exchange ◽  
Electrospinning Technique ◽  
Fuel Cell Application ◽  
High Proton ◽  
Poly Ether Ether Ketone ◽  
Direct Methanol

ABSTRACTGraphene oxide (GO) is one of the most attractive inorganic nanofillers in proton exchange membranes (PEMs) for its large specific surface area and high proton conductivity. The proton conductivity of GO nanosheet is known to be orders of magnitude greater than the bulk GO, thus it is essential to improve the dispersion of GO nanosheets in the PEM matrix to achieve higher conductivity. In this study, we report a facile and effective method to fabricate a GO/sulfonated poly ether ether ketone (SPEEK) composite membrane with well-dispersed GO nanosheets in SPEEK matrix by using electrospinning technique for direct methanol fuel cell application. The composite membrane exhibits improved proton conductivity, dimensional stability and methanol barrier property due to the presence of well-dispersed GOs. It is believed that the GO nanosheets can not only induce continuous channels for proton-conducting via Grotthuss mechanism, but also act as methanol barriers to hinder the methanol molecules from passing through the membrane.

In situobservation of water in a fuel cell catalyst using scanning electron microscopy

Microscopy ◽  
2014 ◽  
Vol 64 (2) ◽  
pp. 87-96 ◽  
Author(s):  
Satoru Ueda ◽  
Yoshio Kobayashi ◽  
Satoshi Koizumi ◽  
Yasuyuki Tsutsumi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fuel Cell ◽  
Fuel Cell Catalyst ◽  
Scanning Electron

Preparation of Pd /α–Al2O3 and Pd-Ag/α–Al2O3 Membranes by Electroless Plating and Permeation Measurements

2012 ◽  
Vol 1372 ◽  
Author(s):  
L. Ortiz-Martínez ◽  
M. Torres-Rodríguez ◽  
M. Gutiérrez-Arzaluz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electroless Plating ◽  
Energy Dispersive Spectroscopy ◽  
Ceramic Composite ◽  
Composite Membranes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Α Al2o3 ◽  
Scanning Electron

ABSTRACTIn this work, the synthesis of dense Pd/α–Al2O3 and Pd-Ag/α–Al2O3 ceramic composite membranes was done through the sequential electroless plating technique of Pd and Ag. The precursors are solutions of PdCl2 and AgNO3 and N2H4 salts, as reducing agent. The membranes were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Energy Dispersive Spectroscopy (EDS). The permeation tests of H2 and N2 was carried out at 20 psi of pressure and at 25°C, resulted πH2=5.2x10-9 mol H2/m2·s·Pa and πN2=8.2x10-10 mol N2/m2·s·Pa.

Subsolidus phase relations in the La2O3–Fe2O3–Al2O3 system

2001 ◽  
Vol 16 (3) ◽  
pp. 822-827
Author(s):  
Danjela Kuščer ◽  
Slavko Bernik ◽  
Marko Hrovat ◽  
Janez Holc
Keyword(s):  
Electron Microscopy ◽  
Phase Diagram ◽  
Scanning Electron Microscopy ◽  
Fuel Cell ◽  
Solid Oxide ◽  
Phase Relations ◽  
Oxide Fuel ◽  
Subsolidus Phase ◽  
X Ray ◽  
Scanning Electron

The subsolidus phase relations in the La–Fe–Al–O system were investigated for solid oxide fuel cell (SOFC) applications. Five compounds, LaAlO3, LaAl11O18, LaFe12O19, AlFeO3, and LaFeO3, coexist in the La–Fe–Al–O system at 1380 °C in air. The microstructure and composition of the samples were studied by x-ray diffractometry and scanning electron microscopy. Based on experimental evidence, a phase diagram of the La2O3–Al2O3–Fe2O3 system has been proposed.

scholarly journals Imaging of Fuel Cell and Battery Electrodes Using Focused Ion Beam Scanning Electron Microscopy

2016 ◽  
Vol 22 (S3) ◽  
pp. 1310-1311 ◽  
Author(s):  
Scott Barnett ◽  
Hongqian Wang ◽  
Zhao Liu ◽  
David Kennouche ◽  
Kyle Yakal-Kremski
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fuel Cell ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Beam Scanning ◽  
Scanning Electron

Preparation and Synthesis of Functional Silica-Nafion Composite Materials

2012 ◽  
Vol 496 ◽  
pp. 310-313 ◽  
Author(s):  
Yu Yuan Zhi ◽  
Kai Gu ◽  
Hui Qin Lian ◽  
Xiu Guo Cui
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ionic Conductivity ◽  
Physical Properties ◽  
Linear Expansion ◽  
Composite Membranes ◽  
Exchange Capacity ◽  
Ion Exchange Capacity ◽  
Functionalized Mesoporous Silica ◽  
Scanning Electron

In this study, a series of sulfonic-functionalized mesoporous silica (SMS) were synthesized and SMS-Nafion composites membranes were fabricated. The morphology of SMS was characterized by scanning electron microscopy and BET. The physical properties of SMS and composites membranes were tested in terms of ion-exchange capacity, linear expansion, and ionic conductivity. The results showed that the morphology of SMS influenced their physical properties as well as the properties of SMS-Nafion composite membranes.

Superhydrophobic inkjet printed flexible graphene circuits via direct-pulsed laser writing

Nanoscale ◽  
2017 ◽  
Vol 9 (48) ◽  
pp. 19058-19065 ◽  
Author(s):  
Suprem R. Das ◽  
Srilok Srinivasan ◽  
Loreen R. Stromberg ◽  
Qing He ◽  
Nathaniel Garland ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Molecular Dynamic Simulation ◽  
Molecular Dynamic ◽  
Dynamic Simulation ◽  
Pulsed Laser ◽  
Scanning Electron Microscopy Micrographs ◽  
Simulation Results ◽  
Scanning Electron

(Left) Scanning electron microscopy micrographs and corresponding contact angle (CA) images for (top) thermally annealed inkjet printed graphene (IPG) and (bottom) laser annealed (IPG). (Right) Molecular dynamic simulation results correlating CA and changes in graphene petal orientation due to laser treated IPG.

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