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Showing 1 to 11 of 11 for “"mechanical activation"”.
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Multiscale characterization of mechanochemical reactions in mechanophore-crosslinked polymers under shear loading
… backbone. In this dissertation, evidence of a mechanically-induced local chemical reaction (an electrocyclic ring-opening) is provided by a color- and fluorescence-generating spiropyran mechanophore. The opening of spiropyran (SP) into merocyanine (MC) is driven by mechanical force, UV light, …
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Sistemi e dispositivi meccanici applicati a processi fisici e chimici
… on a local basis in the presence of unbalanced mechanical stresses, which result in non-Equilibrium thermodynamic conditions. Transformations are typically driven by ball milling, a powder metallurgy technique based on the occurrence of collisions between milling tools inside a reactor. At each …
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Mechanochemical Triggers for Self -Healing Polymers
… benzocyclobutenes was studied. The products of mechanically-accelerated ring opening were studied by trapping experiments. Ultrasound induces ring opening at 10°C, whereas thermal activation only took place at temperatures over 105°C. It was found that the substitution pattern around the …
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A study of mechanochemical activation in solid-state synthesis of advanced ceramic composites
Mechanical methods of the activation of chemical processes are currently widely used for the synthesis of various compounds. Intensive (dry) milling of ultra-fine and nanometer-sized powders is considered to be a way of applying “mechanochemical activation” that involves dispersion of solids, …
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Control of mechanochromic reactions in a polymer matrix
… productive chemical transformations under a mechanical force including color change, small molecule release, and cross-linking. Productive chemical transformations depend on the intrinsic molecular structure as well as the extrinsic environment of the mechanophore. On the molecular level, the …
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Heart failure and associated structural and functional remodeling: assessment employing various magnetic resonance imaging methodologies.
… of the left ventricle and serves three main mechanical functions: (1) equalizing myofiber strain and workload; (2) optimizing the volume of blood ejected during systole (stroke volume); and/or (3) storing torsional energy in the intracellular and extracellular matrices and, when released, …
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Mechanochemical Reaction Development for Addition, Elimination, and Isomerization
<p>It is now well appreciated that coupled mechanical forces can influence the rates and outcomes of covalent chemical reactions in isolated polymers and in bulk polymeric materials. Mechanochemical reactions have been widely used in mechanocatalysis, release of small molecules and protons, biasing …
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The role of microstructure on the combustion and impact behavior of mechanically activated nickel/aluminum reactive composites
… during exothermic reaction after thermal or mechanical initiation. However, conventionally these materials typically have slow reaction rates and are difficult to ignite at typical micron particle size ranges limiting their application. Therefore, mechanical activation techniques have been …
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The role of myocardial fibrosis and ventricular mechanical dyssynchrony in the pathogenesis and treatment of contractile myocardial dysfunction.
… to heterogeneity in the time to regional mechanical activation within the left ventricle. Ventricular dyssynchrony has also been implicated in the pathogenesis of systolic heart failure, and its treatment by cardiac resynchronisation has been proven efficacious in selected patients with …
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Phase formation and structural transformation of strontium ferrite SrFeOx
… treatment in various atmospheres as well as mechanical energy (ball milling). ¶ ...
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Phase formation and structural transformation of strontium ferrite SrFeOx
… treatment in various atmospheres as well as mechanical energy (ball milling). ¶ ...