Results 211 to 220 of about 5,411 (251)

Mechanochemical Activation and Catalysis

2019
Chemical transformations induced by mechanical force in solids are remarkable since they facilitate syntheses that are normally difficult to achieve in solution and thus allow the preparation of new molecules and materials or drastic improvements of the yields and selectivities.
Maximilian N. Kopylovich, Ana P. C. Ribeiro, Elisabete C. B. A. Alegria   +2 more
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Mechanochemical Activation of Bauxite

2012
The crystallized layer that compounds the bauxite’s geological profile from NE Para was ore dressed through the processes of crushing, screening, washing and grinding, in order to reach the same size distribution of that in the alumina production industry. After the preparation process, the sample (90%, < 0.21 mm) containing 5.3% reactive silica and 47.
Fernanda A. N. G. Silva, Carla N. Barbato, Rachel D. Santos, Diego S. G. de Almeida, João A. Sampaio, Marta E. Medeiros, Francisco M. S. Garrido   +6 more
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Structure–Mechanochemical Activity Relationships for Cyclobutane Mechanophores

Journal of the American Chemical Society, 2011
Ultrasound activation of mechanophores embedded in polymer backbones has been extensively studied of late as a method for realizing chemical reactions using force. To date, however, there have been few attempts at systematically investigating the effects of mechanophore structure upon rates of activation by an acoustic field.
Matthew J, Kryger, Alexander M, Munaretto, Jeffrey S, Moore   +2 more
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Shockwave Loading of Mechanochemically Active Polymer Coatings

ACS Applied Materials & Interfaces, 2014
Thin films of mechanochemically active polymer were subjected to laser-generated, high amplitude acoustic pulses. Stress wave propagation through the film produced large amplitude stresses (>100 MPa) in short time frames (10-20 ns), leading to very high strain rates (ca. 1 × 10(7) to 1 × 10(8) s(-1)).
Martha E, Grady, Brett A, Beiermann, Jeffrey S, Moore, Nancy R, Sottos   +3 more
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Mechanochemical activation of kaolinite surfaces

2003
Kaolinite surfaces were modified by grinding kaolinite/quartz mixtures for periods of time up to 10 hours. X-ray diffraction shows the loss of intensity of the d(001) spacing with mechanical treatment resulting in the delamination of the kaolinite. Thermogravimetric analyses show the kaolinite surface is significantly modified and surface hydroxyls are
Frost, Raymond, Makoe, Eva, Kristof, Janos, Ding, Zhe, Kloprogge, Theo   +4 more
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Mechanochemical activation of aluminum. 4. Kinetics of mechanochemical synthesis of aluminum carbide

Colloid Journal, 2006
The kinetics of mechanochemical synthesis of aluminum carbide Al4C3 from elements was studied with X-ray diffraction analysis, low-temperature argon adsorption, laser granulometry, chemical analysis, X-ray photoelectron spectroscopy, and electron scanning microscopy.
A. N. Streletskii, I. V. Povstugar, A. B. Borunova, S. F. Lomaeva, P. Yu. Butyagin   +4 more
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Mechanochemical Activation of Magnetite Nanoparticles

Journal of Nanoparticle Research, 2000
Using Mossbauer spectroscopy as a function of ball milling time, it was found that nanomagnetite behaves differently than magnetite during mechanochemical activation. The phase sequence is determined by the original particle size of the powder.
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Enhanced fluoride sorption by mechanochemically activated kaolinites

Journal of Hazardous Materials, 2008
Kaolinite clay obtained from the mines was processed and studied for its fluoride sorption capacity. The surface area of the clay mineral was increased from 15.11 m(2)/g (raw) to 32.43 m(2)/g (activated) by mechanochemical activation. Batch adsorption studies were conducted to optimize various equilibrating conditions like the effect of contact time ...
S, Meenakshi, C Sairam, Sundaram, Rugmini, Sukumar   +2 more
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ChemInform Abstract: Drug Mechanochemical Activation

ChemInform, 2010
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
I. Colombo, G. Grassi, M. Grassi
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Mechanochemical activation of calcium oxide powder

Powder Technology, 1996
Abstract CaO formed by decomposing CaC03 at 1450 °C was ground in a vibrational mill. The variations of mechanochemical properties of the sample, such as surface area, crystal structure, surface free energy and reaction activity were studied. Inverse gas chromatography (IGC) was ised in the analysis of surface free energy of the sample.
null Zheng Yi Fu, null Shi Liu Wei
openaire   +1 more source