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The Application of Sulfonated Poly(arylene ether)s for Proton Exchange MembraneHo, Chi-Jen 06 July 2011 (has links)
Three aromatic poly(arylene ether)s P2¡BP3¡BP4 were synthesized from bis(fluoride)4,4¡¨¡¨-Difluoro-3,3¡¨¡¨-bsi-trifluoromethyl-n¡¨-bisphenyl-[1,1¡¦;4¡¦,1¡¨;4¡¨,1¡¨¡¦;4¡¨¡¦,1¡¨¡¨]-quinquephenyl(n¡¨:2¡¨,3¡¨[G2];2¡¨,3¡¨,5¡¨[G3];2¡¨,3¡¨,5¡¨,6¡¨[G4]) with 4,4'-(9-Fluorenylidene)diphenol. The molecular weight of the polymer (Mw: 105-1.6¡Ñ105, PDI:1.5-2.2) was measured by gel permeation chromatography and the structure was confirmed by NMR spectra. Thermal stability was measured using Thermogravimetry and Thermomechanical Analysis. The polymer had a Td at 520¢J ~550¢J, and soft point at 310¢J. Young's modulus of polymer was (1.25-2.5Gpa). This polymer has high strength, modulus of elasticity, and thermal stability. The polymer consists of polyaromatic groups with bisfluoride monomer, (5, 6, 7 aromatic). We hypothesized that sulfonation of the polymer will exhibit high conductivity and great mechanical properties. Ion exchange capacities (IECs) were evaluated by acid¡Vbase titration. We sulfonated the polymer in order to apply to the proton exchange membrane fuel cell. The results showed after sulfonation of P4, IEC is 3.3(meq/g), and sulfonation of P2 showed that its proton conductivity is 75% more than Nafion117 at 80¢J with 0.28(S/cm).
Keywords: proton exchange membrane, proton conductivity, Nafion, sulfonated, ion exchange capacity
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Role of the C-terminal cytoplasmic tail of the NhaP2 antiporter from Vibrio cholerae in transmembrane ion transportWiens, Evan Jonathan 16 September 2013 (has links)
Although the importance of cation/proton antiporters in cellular physiology is well recognized and widely studied, many antiport systems remain underinvestigated. In this work, I report the phenotypic and biochemical effects of deletion of the cytoplasmic C-terminal tail of the NhaP2 antiporter from Vibrio cholerae (Vc-NhaP2). Namely, deletion of the C-terminal tail results in diminished K+/H+ and Na+/H+ antiport activity, as well as a 5-fold decrease in affinity for its major substrate, K+ (measured as the apparent Km at pH 7.5). Furthermore, reconstitution of antiport activity in the truncation mutant upon addition of exogenous C-terminal tail is demonstrated. Currently, the only known mechanism of antiport is for NhaA, which lacks a cytoplasmic tail. Therefore, these results suggest that NhaP2 may employ a novel mechanism of antiport in which the cytoplasmic tail is directly or indirectly involved.
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Composite proton exchange membranes for fuel cellsLiu, Ping. January 2006 (has links)
Thesis (Ph. D.)--Michigan State University. Dept. of Chemistry, 2006. / Title from PDF t.p. (viewed on June 19, 2009) Includes bibliographical references (p. 148-154). Also issued in print.
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Investigation of CO tolerance in proton exchange membrane fuel cellsZhang, Jingxin. January 2004 (has links)
Thesis (Ph. D.)--Worcester Polytechnic Institute. / Keywords: kinetic modeling; electrocatalysis; CO tolerance; PEM fuel cells. Includes bibliographical references.
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Investigation of thermodynamic and transport properties of proton-exchange membranes in fuel cell applicationsChoi, Pyoungho. January 2004 (has links)
Thesis (M.S.)--Worcester Polytechnic Institute. / Keywords: Thermodynamics; Fuel Cell; Proton-exchange membranes; Proton Transport. Includes bibliographical references.
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Messung der Strukturfunktion F2 bei kleinen Bjorken-x und kleinen Impulsüberträgen mit dem VLQ-Spektrometer des H1-DetektorsMeyer, Peer-Oliver. Unknown Date (has links) (PDF)
Techn. Hochsch., Diss., 2000--Aachen.
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Untersuchung der w- und der F-Produktion in Proton-Proton-Stößen nahe der ReaktionsschwelleBrenschede, Arndt. Unknown Date (has links)
Universiẗat, Diss., 1997--Gießen.
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Untersuchung von Proton-Proton-Reaktionen an der Pion-Produktionsschwelle mit dem COSY-TOF-SpektrometerJakob, Bettina. Unknown Date (has links) (PDF)
Techn. Universiẗat, Diss., 2002--Dresden.
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Investigation of the a+0(980)-resonance in the reaction pp-]dK+K0 at an excess energy of Q=46 MeV with ANKEKleber, Vera. Unknown Date (has links) (PDF)
University, Diss., 2003--Köln.
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Analysierstärke und Spinkorrelationsparameter der elastischen Proton-Proton-Streuung im Energiebereich von 0,5 bis 2,5 GeVUlbrich, Kay. Unknown Date (has links) (PDF)
Universiẗat, Diss., 2005--Bonn.
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