Results 51 to 60 of about 108,847 (296)

Enhanced performance of nanocomposite membrane developed on sulfonated poly (1, 4-phenylene ether-ether-sulfone) with zeolite imidazole frameworks for fuel cell application

Scientific Reports, 2023
Proton exchange membrane fuel cells (PEMFC) have received a lot of interest and use metal–organic frameworks (MOF)/polymer nanocomposite membranes. Zeolite imidazole framework-90 (ZIF-90) was employed as an addition in the sulfonated poly (1, 4-phenylene
Bita Soleimani, Ali Haghighi Asl, Behnam Khoshandam, Khadijeh Hooshyari   +3 more
doaj   +1 more source

Structural study of the local order in ammonia-modulated FE(II) hydroxyphosphonoacetate proton conductors [PDF]

, 2017
Layered Fe(II) carboxiphosphonate, Fe-HPAA·2H2O, is a crystalline multifunctional coordination polymer exhibiting properties as photocatalyst and proton conductor.
Bazaga-García, Montse, Cabeza-Diaz, Aurelio, Colodrero, Rosario M.P., Losilla, Enrique R., Olivera-Pastor, Pascual, R.Salcedo, Inés   +5 more
core  

Some Peculiarities of Proton Transport in Quasi-One-Dimensional Hydrogen-Bonded Chains

, 1999
The protonic conductivity in the hydrogen bonded chains is investigated theoretically in the framework of the two-stage transport model. The strong interactions with optical phonon stretching mode are considered.
Stasyuk I. V., Zetterström P.
core   +1 more source

Structural insights into an engineered feruloyl esterase with improved MHET degrading properties

FEBS Letters, EarlyView.
A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa, Konstantinos Makryniotis, Theofani‐Iosifina Sousani, Evangelos Topakas, Vangelis Daskalakis, Maria Dimarogona   +5 more
wiley   +1 more source

Proton-Blocking Anion-Exchange Membranes for Efficient Lithium Hydroxide Recovery by Bipolar Membrane Electrodialysis

Membranes
In bipolar membrane electrodialysis (BPED), proton transport through the anion-exchange membrane (AEM) is a major factor that reduces overall process efficiency.
Ji-Hyeon Lee, Moon-Sung Kang
doaj   +1 more source

Polyvinylimidazole-wrapped Halloysite Nanotubes for High Proton Conductivity in Polymer Electrolyte Membranes

International Journal of Electrochemical Science, 2020
The construction of continuous proton transfer channels within a proton exchange membrane is an important and challenging task for the logical design of proton exchange membranes. Herein, inspired by the mechanism of moisture transport used by plants and
Xiaoyang Liu, Xiang Sun, Hongqian Ren, Mengjie Yang, Mingling Xia, Jinghe Hou, Yi Feng, Huili Ding   +7 more
doaj   +1 more source

Composite membranes for proton exchange membrane fuel cells based on methyl methacrylate-co-maleimide /phosphotungstic acid [PDF]

شیمی کاربردی روز, 2018
Poly(methyl methacrylate-co-nitrophenyl maleimide) (MMA-co-NMI) and poly(methyl‌‌‌‌ methacrylate-co-hydroxyphenyl maleimide)‌‌‌‌‌ (MMA-co-HMI) copolymers were synthesized using free radical polymerization of MMA with a new MI monomer containing phenyl ...
zahra seidzadeh, Fariborz Atabaki, negin Ghaemi, Mohammad Nasiri   +3 more
doaj   +1 more source

New multifunctional sulfonato-containing metal phosphonates proton conductors [PDF]

, 2018
Anchoring of acidic functional groups to organic linkers acting as ligands in metal phosphonates has been demonstrate to be a valid strategy to develop new proton conductor materials, which exhibit tunable properties and are potentially applicable to ...
Bazaga García, Montse, Cabeza-Diaz, Aurelio, Demadis, Konstantinos D., Olivera-Pastor, Pascual, Pérez Colodrero, Rosario Mercedes, Ramirez-Losilla, Enrique, Ruiz Salcedo, Inés, Stock, Norbert, Xanthopoulos, Konstantinos   +8 more
core  

Synthesis, Sintering, and Electrical Properties of BaCe0.9−xZrxY0.1O3−δ [PDF]

, 2008
BaCe0.9−xZrxY0.1O3−δ powders were synthesized by a solid-state reaction. Different contents of cerium and zirconium were studied. Pellets were sintered using either conventional sintering in air at 1700◦C or the Spark Plasma Sintering (SPS) technique ...
Bonanos, Nikolaos, Caboche, Gilles, Estournès, Claude, Ricote, Sandrine   +3 more
core   +4 more sources

A methionine‐lined active site governs carbocation stabilization and product specificity in a bacterial terpene synthase

FEBS Letters, EarlyView.
This study reveals a unique active site enriched in methionine residues and demonstrates that these residues play a critical role by stabilizing carbocation intermediates through novel sulfur–cation interactions. Structure‐guided mutagenesis further revealed variants with significantly altered product profiles, enhancing pseudopterosin formation. These
Marion Ringel, Carl P. O. Helmer, Shani Zev, Ronja Driller, Emily Buhr, Markus Reinbold, Renana Schwartz, Gabriel Foley, Mikael Boden, Daniel Garbe, Gerhard Schenk, Dan Thomas Major, Bernhard Loll, Thomas Brück   +13 more
wiley   +1 more source