Results 51 to 60 of about 42,763 (313)

Thermooxidative stability of PMMA composites [PDF]

, 2012
Tato práce se zabývá studiem termooxidační stability kompozitů polymethylmethakrylátu (PMMA) plněného mikro a nanočásticemi siliky. V připravených vzorcích byly použity různé objemové zlomky a různé velikosti částic siliky.
Čechová, Eva
core  

Ideal Molecular Sieving with a Dense MOF for Helium Upgrading with Highly Diffusion Selective Mixed Matrix Membranes

Advanced Functional Materials, EarlyView.
The separation of Helium gas from natural gas is challenging but highly important. MIL‐116(Ga), a “non‐porous” metal–organic framework is used as a molecular sieve to separate He from CH4. Druse‐like MIL‐116(Ga) particles are integrated into polysulfone mixed matrix membranes.
Ayisha Komal, Laura Calderón‐Rodríguez, Oksana Smirnova, Eren Grossmann, Aparna Binu Varghese, Karen Marlenne Garcia Alvarez, Andreas Schneemann, Thomas Hoyer, Ralf Wyrwa, Felix Helmut Schacher, Alexander Knebel   +10 more
wiley   +1 more source

Hybrid materials based on polyethylene and MCM-41 microparticles functionalized with silanes: catalytic aspects of in situ polymerization, crystalline features and mechanical properties [PDF]

, 2016
New nanocomposites based on polyethylene have been prepared by in situ polymerization of ethylene in presence of mesoporous MCM-41. The polymerization reactions were performed using a zirconocene catalyst either under homogenous conditions or supported
A. Bento, Alexander, Alonso-Moreno, Arranz-Andrés, Arranz-Andrés, Arranz-Andrés, Beck, Bento, Boyd, Bunn, Campos, Campos, Cerrada, Cerrada, Cerrada, Cerrada, Cerrada, Cerrada, Cerrada, Cerrada, Chen, Chen, Chenite, Darras, Diez-Pascual, dos Santos, E. Pérez, Finch, Fonseca, Fox, Gedde, Ha, Heijboer, Hiltner, J.P. Lourenço, Jafari, Jentys, Jezequel, Kageyama, Kageyama, Kubacka, Kubacka, Lin, Lourenco, Lu, López-Majada, M.L. Cerrada, M.R. Ribeiro, Marcilla, McCrum, Millot, Oliver, Palza, Palza, Popli, Popli, Prieto, Quinn, Schatzki, Shin, Shirayam, Sindorf, Sinfrônio, V. Lorenzo, Vincent, Ward, Wunderlich, Wunderlich, Ye, Zapata, Zhao   +70 more
core   +1 more source

Intermolecular Interactions as Driving Force of Increasing Multiphoton Absorption in a Perylene Diimide‐Based Coordination Polymer

Advanced Functional Materials, EarlyView.
This study uncovers the unexplored role of intermolecular interactions in multiphoton absorption in coordination polymers. By analyzing [Zn2tpda(DMA)2(DMF)0.3], it shows how the electronic coupling of the chromophores and confinement in the MOF enhance two‐and three‐photon absorption.
Simon Nicolas Deger, Anna Mauri, Yang Cui, Sebastian Josef Weishäupl, Ali Deniz Özdemir, Hamad Syed, Aleksandr Ovsianikov, Wolfgang Wenzel, Alexander Pöthig, Jürgen Hauer, Mariana Kozlowska, Roland Augustinus Fischer   +11 more
wiley   +1 more source

MnI‐Functionalized Covalent Organic Framework as Efficient Electrocatalyst for CO2 Reduction in a Catholyte‐Free Zero‐Gap Electrolyzer

Advanced Functional Materials, EarlyView.
This work demonstrates the successful integration of a phenanthroline‐based 2D COF with MnI catalytic sites into a catholyte‐free membrane‐electrode‐assembly cell for CO2 electroreduction. The crystalline COF actively suppresses Mn⁰–Mn⁰ dimerization, achieving a turnover frequency of 617 h⁻¹ at 2.8 V (full‐cell potential), and enabling stable operation.
Laura Spies, Marcos Eduardo G. Carmo, Gonçalves J. Marrenjo, Stephan Reuther, Patrick Ganswindt, Antonio Otavio T. Patrocinio, Thomas Bein, Osmando F. Lopes, Jenny Schneider   +8 more
wiley   +1 more source

Síntese, caracterização e comportamento térmico de amidossulfonatos de terras raras

Química Nova, 2013
Hydrated compounds prepared in aqueous solution by reaction between amidosulfonic acid [H3NSO3] and suspensions of rare earth hydroxycarbonates [Ln2(OH)x(CO3)y.zH2O] were characterized by elemental analysis (% Ln, % N and % H), infrared spectroscopy ...
José Marques Luiz, Ronaldo Spezia Nunes, Jivaldo do Rosário Matos   +2 more
doaj   +1 more source

Influence of hydrogen bonds on glass transition and dielectric relaxations of cellulose [PDF]

, 2011
The molecular dynamics in hydrated cellulose has been investigated by a combination of thermal analyses and dielectric spectroscopy. Differential scanning calorimetry shows the dependence upon hydration of the glass transition temperature Tg.
Dandurand, Jany, Dantras, Eric, Lacabanne, Colette, Roig, Frédéric   +3 more
core   +5 more sources

Rational Fine‐Tuning of MOF Pore Metrics: Enhanced SO2 Capture and Sensing with Optimal Multi‐Site Interactions

Advanced Functional Materials, EarlyView.
A pore tuning strategy to amplify the multi‐site MOF‐SO2 interactions is proposed to achieve an enhanced trace SO2 capture and chemiresistive sensing in highly stable isostructural DMOFs by annelating benzene rings. This work provides a facile strategy to achieve tailor‐made stable MOF materials for specific multifunctional applications.
Shanghua Xing, Abdulrahman Mohabbat, István Boldog, Jens Möllmer, Marcus Lange, Yulyan Haiduk, Tobias Heinen, Vladimir Pankov, Oliver Weingart, Christoph Janiak   +9 more
wiley   +1 more source

Estudo termogravimétrico do efeito da temperatura e da atmosfera na absorção de dióxido de enxofre por calcário

Química Nova, 2006
Thermogravimetry was applied to investigate the effects of temperature and atmosphere on conversion of sulfur dioxide (SO2) absorbed by limestone. Ranges of temperature and particle size were studied, typical of fluidized-bed coal combustion.
Ivonete Ávila, Paula M. Crnkovic, Fernando E. Milioli   +2 more
doaj   +1 more source

Kinetic study of the catalytic pyrolysis of elephant grass using Ti-MCM-41 [PDF]

Materials Research, 2014
This work aimed to study the kinetics of thermal and catalytic pyrolysis using Ti-MCM-41 as catalyst in order to assess the catalytic pyrolysis efficiency compared to thermal pyrolysis of elephant grass.
Maria do Socorro Braga Fontes, Dulce Maria de Araújo Melo, Joana Maria de Farias Barros, Renata Martins Braga, Gicélia Rodrigues   +4 more
doaj   +1 more source