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Saito, “Mechanochemical Synthesis of

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Mechanochemical synthesis of small organic molecules

N2 - Core/shell-like nanostructured xLi2MnO3·(1 - x)LiMO2 (M = Ni, Co, Mn) composite cathode materials are successfully synthesized through a simple solid-state reaction using a mechanochemical ball-milling process. The LiMO2 core is designed to have a high-content of Ni, which increases the specific capacity. The detrimental surface effects arising from the high Ni-content are countered by the Li 2MnO3 shell, which stabilizes the nanoparticles. The electrochemical performances and thermal stabilities of the synthesized nanocomposites are compared with those of bare LiMO2. In particular, the results of time-resolved X-ray diffraction (TR-XRD) analyses of xLi 2MnO3·(1 - x)LiMO2 nanocomposites as well as their differential scanning calorimetry (DSC) profiles demonstrate that the Li2MnO3 shell is effective in stabilizing the LiMO2 core at high temperatures, making the nanocomposites highly suitable from a safety viewpoint.

Mechanochemical organic synthesis

Mechanochemical Organic Synthesis is a comprehensive reference that not only synthesizes the current literature but also offers practical protocols that industrial and academic scientists can immediately put to use in their daily work. Increasing interest in green chemistry has led to the development of numerous environmentally-friendly methodologies for the synthesis of organic molecules of interest. Amongst the green methodologies drawing attention, mechanochemistry is emerging as a promising method to circumvent the use of toxic solvents and reagents as well as to increase energy efficiency.

Mechanochemical Synthesis of Nanoparticles - …

Mechanochemical Synthesis of Metal−Organic Frameworks…

Core/shell-like nanostructured xLi2MnO3·(1 - x)LiMO2 (M = Ni, Co, Mn) composite cathode materials are successfully synthesized through a simple solid-state reaction using a mechanochemical ball-milling process. The LiMO2 core is designed to have a high-content of Ni, which increases the specific capacity. The detrimental surface effects arising from the high Ni-content are countered by the Li 2MnO3 shell, which stabilizes the nanoparticles. The electrochemical performances and thermal stabilities of the synthesized nanocomposites are compared with those of bare LiMO2. In particular, the results of time-resolved X-ray diffraction (TR-XRD) analyses of xLi 2MnO3·(1 - x)LiMO2 nanocomposites as well as their differential scanning calorimetry (DSC) profiles demonstrate that the Li2MnO3 shell is effective in stabilizing the LiMO2 core at high temperatures, making the nanocomposites highly suitable from a safety viewpoint.

Advanced materials processing and post-processing carried out include Mechanochemical activation, Semi-solid processing, Biomimicry, Thermo-mechanical treatments, High Temperature Synthesis, Advanced Joining, Grain boundary engineering, High strain rate forming, and several other techniques.

Mechanochemical Organic Synthesis - ScienceDirect

Mechanochemical synthesis of thioureas, ureas and …

The mechanochemical synthesis strategy to obtain metal−organic frameworks (MOFs) with high surface areas in quantitative yields is demonstrated for two examples. Our investigations confirm that this facile approach is capable of the synthesis of these MOFs, leading to high surface areas that are comparable to those obtained via common synthetic routes.

Recent experimental work on lanthanum telluride has confirmed its significant potential as an n-type material for high temperature thermoelectric (TE) power generation application. The phase of interest, La3−xTe4, has a Th3P4 defect structure where x is the lanthanum vacancy with values ranging between 0 and 1/3. Thermoelectric properties change rapidly with x since the carrier concentration, n, is proportional to the (1−3x) parameter. Controlling the Te to La stoichiometry in lanthanum telluride is thus vital to achieving the optimum self-doping level for the highest dimensionless figure of merit ZT value. We report on a significant improvement in reproducibly preparing this refractory compound over prior lengthy and unwieldy high temperature experimental techniques developed in the 1980's. Mechanochemical processes are utilized to synthesize precise stoichiometries of lanthanum telluride at room temperature, enabling improved characterization, analysis and modeling of its transport properties as a function of the number of La vacancies. We report TE properties for a large range of the allowed compositions, with ZT values greater than 1.0 obtained at 1275 K for several compositions. In addition to stoichiometric optimization within the pure compound, chemical substitutions can enhance performance by decreasing the lattice thermal conductivity and tuning the electrical properties for maximum ZT values at lower temperatures; preliminary studies indicate that the addition of ytterbium increases ZT. Some properties pertaining to device development are discussed. Specifically, lanthanum telluride has a low sublimation rate, and a coefficient of thermal expansion that closely matches a p-type rare earth compound analog (the Yb14MnSb11 Zintl compound).

Mechanochemical Synthesis of Carbon Nanothread …
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  • The two-step mechanochemical synthesis of porphyrins.

    Mechanochemical synthesis …

  • The two-step mechanochemical synthesis of porphyrins

    Mechanochemical synthesis of vanadium nitride | …

  • Nanopowders Synthesized by Mechanochemical …

    The results of recent investigation of the mechanochemical synthesis of inorganic nanoparticles are reviewed

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Mechanochemical Synthesis of PZT - ResearchGate

and and and and and and (2017)Mechanochemical synthesis of nanocrystalline hydroxyapatite from Mercenaria clam shells and phosphoric acid. Biomedical Physics & Engineering Express, 3 (1). Art No-015010.

Mechanochemical synthesis of Co, Ni, Fe nanoparticles …

The aim of the present study is to synthesize hydroxyapatite from seashell and to explore its biocompatibility in vitro . Nano-crystalline hydroxyapatite (HAp) ceramics were successfully fabricated by a mechanochemical method using clam seashells and phosphoric acid. The CaO and H 3 PO 4 acid at different w.t ratios i.e. 1:0.75, 1:1.25, 1:1.5 and 1:1.75, were ball milled and then heat treated at 1000 °C for 3 h to complete reactions. The synthesized powders were characterized using x-ray diffraction (XRD), FTIR spectroscopy, scanning electron microscope and high resolution transmission electron microscopy. XRD results showed that the average crystallite size of the powder varies from 53 to 67 nm and crystallinity of powder found to be in the range of 88 and 96. In vitro biocompatibility studies were carried out using osteoblast (MG63) and fibroblast cells (NIH3T3), demonstrated non-toxic nature of the seashell derived HAp powder.

Mechanochemical Organic Synthesis - Rakuten Kobo

Iptycenes are intriguing compounds receiving considerable attention as a result of their rigid noncompliant three-dimensional architecture. The preparation of larger iptycenes is often problematic, as a result of their limited solubility and synthetic procedures involving multiple Diels–Alder reactions under harsh extended reaction conditions. We report a mechanochemical synthesis of structurally well-defined iptycenes through an iterative reaction sequence, wherein Diels–Alder reactions and a subsequent aromatization afford higher order iptycenes. We further report that double Diels–Alder reactions under solvent-free condition provide facile access to highly functionalized iptycenes with molecular weights over 2000 Da. Quartz crystal microbalance measurements reveal that these materials efficiently absorb the aromatic hydrocarbons benzene and toluene.

Mechanochemical Synthesis of Fluorapatite-Zinc Oxide …

Porphyrin synthesis under solvent-free conditions represents the “greening” of a traditional synthesis that normally requires large amounts of organic solvent, and has hindered industrial-scale synthesis of this useful class of molecules. We have found that the four-fold acid-catalysed condensation of aldehyde and pyrrole to yield a tetra-substituted porphyrin is possible through mechanochemical techniques, without a solvent present. This represents one of the still-rare examples of carbon-carbon bond formation by mechanochemistry. Specifically, upon grinding equimolar amounts of pyrrole and benzaldehyde in presence of an acid catalyst, cyclization takes place to give reduced porphyrin precursors (reversible), which upon oxidation form tetraphenylporphyrin (TPP). The approach has been found suitable for synthesis of a variety of meso-tetrasubstituted porphyrins. Oxidation can occur either by using an oxidizing agent in solution, to give yields comparable to those published for traditional methods of porphyrin synthesis, or through mechanochemical means resulting in a two-step mechanochemical synthesis to give slightly lower yields that are still being optimized. We are also working on “green” methods of porphyrin isolation, including entrainment sublimation, which would hopefully further reduce the need for large amounts of organic solvent. These results hold promise for the development of mechanochemical synthetic protocols for porphyrins and related classes of compounds.

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