scholarly journals Mechanochemical synthesis of N-doped porous carbon at room temperature

Nanoscale ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 4712-4718 ◽  
Author(s):  
Mirian Elizabeth Casco ◽  
Sebastian Kirchhoff ◽  
Desirée Leistenschneider ◽  
Marcus Rauche ◽  
Eike Brunner ◽  
...  
Keyword(s):  
Mechanochemical Synthesis ◽  
Porous Carbon ◽  
Ball Mill ◽  
Room Temperature ◽  
Planetary Ball Mill ◽  
Porous Carbons ◽  
One Pot

One-pot mechanochemical synthesis of N-doped porous carbons at room temperature using a planetary ball mill.

scholarly journals Simple and scalable synthesis of hierarchical porous carbon derived from cornstalk without pith for high capacitance and energy density

2020 ◽  
Vol 8 (3) ◽  
pp. 1469-1479 ◽  
Author(s):  
Jiaming Li ◽  
Qimeng Jiang ◽  
Lansheng Wei ◽  
Linxin Zhong ◽  
Xiaoying Wang
Keyword(s):  
Energy Density ◽  
Porous Carbon ◽  
Porous Carbons ◽  
Hierarchical Porous Carbon ◽  
One Pot ◽  
High Capacitance ◽  
Hierarchical Porous ◽  
Hierarchical Porous Carbons ◽  
Scalable Synthesis

A sustainable one-pot route for the synthesis of hierarchical porous carbons (HPCs) from cornstalk without pith is developed.

Biomass based nitrogen-doped structure-tunable versatile porous carbon materials

2017 ◽  
Vol 5 (25) ◽  
pp. 12958-12968 ◽  
Author(s):  
Xin Zhou ◽  
Penglei Wang ◽  
Yagang Zhang ◽  
Lulu Wang ◽  
Letao Zhang ◽  
...  
Keyword(s):  
Specific Surface ◽  
Porous Carbon ◽  
Carbon Materials ◽  
Porous Carbons ◽  
One Pot ◽  
Nitrogen Doped ◽  
Porous Carbon Materials ◽  
Surface Areas ◽  
Cellulose Carbamate ◽  
Specific Surface Areas

Hierarchical nitrogen-doped porous carbons (HNPCs) with tunable pore structures and ultrahigh specific surface areas were designed and prepared from sustainable biomass precursor cellulose carbamate via simultaneous carbonization and activation by a facile one-pot approach.

scholarly journals Efficient mechanochemical synthesis of regioselective persubstituted cyclodextrins

2016 ◽  
Vol 12 ◽  
pp. 2364-2371 ◽  
Author(s):  
Laszlo Jicsinszky ◽  
Marina Caporaso ◽  
Katia Martina ◽  
Emanuela Calcio Gaudino ◽  
Giancarlo Cravotto
Keyword(s):  
Mechanochemical Synthesis ◽  
Ball Mill ◽  
Solvent Free ◽  
Planetary Ball Mill ◽  
Aprotic Solvents ◽  
Isolation And Purification ◽  
Cyclodextrin Derivative ◽  
Complete Reaction ◽  
Solvent Free Conditions

A number of per-6-substituted cyclodextrin derivative syntheses have been effectively carried out in a planetary ball mill under solvent-free conditions. The preparation of Bridion® and important per-6-amino/thiocyclodextrin intermediates without polar aprotic solvents, a source of byproducts and persistent impurities, could be performed. Isolation and purification processes could also be simplified. Considerably lower alkylthiol/halide ratio were necessary to reach the complete reaction in comparison with thiourea or azide reactions. While the presented mechanochemical syntheses were carried out on the millimolar scale, they are easily scalable.

scholarly journals Kinetics and mechanism of mechanochemical synthesis of hafnium nitride ceramics in a planetary ball mill

2019 ◽  
Vol 45 (18) ◽  
pp. 24818-24826 ◽  
Author(s):  
A.A. Nepapushev ◽  
V.S. Buinevich ◽  
L.C. Gallington ◽  
J.M. Pauls ◽  
T. Orlova ◽  
...  
Keyword(s):  
Mechanochemical Synthesis ◽  
Ball Mill ◽  
Kinetics And Mechanism ◽  
Planetary Ball Mill ◽  
Hafnium Nitride ◽  
Nitride Ceramics

Mechanochemical synthesis of porous carbon at room temperature with a highly ordered sp2 microstructure

Carbon ◽  
2018 ◽  
Vol 139 ◽  
pp. 325-333 ◽  
Author(s):  
M.E. Casco ◽  
F. Badaczewski ◽  
S. Grätz ◽  
A. Tolosa ◽  
V. Presser ◽  
...  
Keyword(s):  
Mechanochemical Synthesis ◽  
Porous Carbon ◽  
Room Temperature

scholarly journals Characterization and properties of barium bismuth titanate

2009 ◽  
Vol 3 (1-2) ◽  
pp. 9-12 ◽  
Author(s):  
Jelena Bobic ◽  
Mirjana Vijatovic ◽  
Tadej Rojac ◽  
Biljana Stojanovic
Keyword(s):  
Mechanochemical Synthesis ◽  
Ball Mill ◽  
Room Temperature ◽  
Bismuth Titanate ◽  
Relaxor Ferroelectrics ◽  
X Ray ◽  
Air Atmosphere ◽  
Calcination Step ◽  
Barium Bismuth ◽  
Scanning Electron

BaBi4Ti4O15 (BBiT) was prepared from stoichiometric amounts of BaTiO3 (BT) and Bi4Ti3O12 (BIT) obtained via mechanochemical synthesis. Mechanochemical synthesis was performed in air atmosphere in a planetary ball mill. BBiT ceramics were sintered at 1100?C, 1110?C and 1120?C for 1 h without pre-calcination step. The formation of phase and crystal structure of BT, BIT and BBiT were verified using X-ray analysis. The morphology of obtained powders and microstructure were examined using scanning electron microscopy. The electrical properties of sintered samples were carried out and BBiT shows behaviour typical for relaxor ferroelectrics and dielectric constant at room temperature is approximately 93. .

scholarly journals Yttrium orthoferrite powder obtained by the mechanochemical synthesis

2017 ◽  
Vol 49 (3) ◽  
pp. 277-284 ◽  
Author(s):  
Zorica Lazarevic ◽  
Cedomir Jovalekic ◽  
Martina Gilic ◽  
Valentin Ivanovski ◽  
Ana Umicevic ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Crystallite Size ◽  
Mechanochemical Synthesis ◽  
Ball Mill ◽  
Room Temperature ◽  
Average Crystallite Size ◽  
X Ray Diffraction ◽  
X Ray ◽  
Yttrium Orthoferrite ◽  
Raman And Infrared Spectroscopy

Yttrium orthoferrite (YFeO3) powder was prepared by a mechanochemical synthesis from a mixture of Y2O3 and ?-Fe2O3 powders in a planetary ball mill for 2.5 h. The obtained YFeO3 powder sample was characterized by X-ray diffraction (XRD), Raman and infrared spectroscopy. The average crystallite size calculated by the Scherrer equation was 12 nm. The M?ssbauer spectroscopy at room temperature confirms the superparamagnetic character of YFeO3 orthoferrite sample.

scholarly journals Mechanochemical synthesis of some europium diketonates

2011 ◽  
Vol 9 (2) ◽  
pp. 290-299 ◽  
Author(s):  
Joana Zaharieva ◽  
Maria Milanova ◽  
Dimitar Todorovsky
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Ir Spectra ◽  
Excited States ◽  
Mechanochemical Synthesis ◽  
Ball Mill ◽  
Emission Spectra ◽  
Planetary Ball Mill ◽  
Fluorescence Properties ◽  
Partial Synthesis

AbstractResults on the influence of mechanoactivation (3–30 min) in a planetary ball mill on the composition, crystal structure, IR spectra and morphology of EuCl3·6H2O, dibenzoylmethane (HDBM) and mixtures of EuCl3·6H2O — HDBM and EuCl3·6H2O — HDBM — 1,10-phenathroline (phen) are presented. Mechanoactivation leads to a decrease of interplanar distances of the EuCl3·6H2O and HDBM and partial synthesis of Eu(DBM)3 and Eu(DBM)3·phen in the respective mixtures. The fluorescence properties of the products of activation (excitation and emission spectra, lifetime of the excited states) are similar to those of the complexes produced by the conventional “wet” methods, but the strongest excitation of the mechanochemically produced solid state samples is achieved at higher wavelength. Crystals of different forms (prismatic, needle-, long-length-leaf- and rod-like) are formed by mechanoactivation of the mentioned mixtures.

Room Temperature Alkali Metal Reduction of Carbon Dioxide

2020 ◽  
Author(s):  
Lucas A. Freeman ◽  
Akachukwu D. Obi ◽  
Haleigh R. Machost ◽  
Andrew Molino ◽  
Asa W. Nichols ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Alkali Metals ◽  
Room Temperature ◽  
Chemical Reduction ◽  
Bond Cleavage ◽  
Open Shell ◽  
Metal Reduction ◽  
One Pot ◽  
Earth Abundant ◽  
Electron Reduction

The reduction of the relatively inert carbon–oxygen bonds of CO<sub>2</sub> to access useful CO<sub>2</sub>-derived organic products is one of the most important fundamental challenges in synthetic chemistry. Facilitating this bond-cleavage using earth-abundant, non-toxic main group elements (MGEs) is especially arduous because of the difficulty in achieving strong inner-sphere interactions between CO<sub>2</sub> and the MGE. Herein we report the first successful chemical reduction of CO<sub>2</sub> at room temperature by alkali metals, promoted by a cyclic(alkyl)(amino) carbene (CAAC). One-electron reduction of CAAC-CO<sub>2</sub> adduct (<b>1</b>) with lithium, sodium or potassium metal yields stable monoanionic radicals clusters [M(CAAC–CO<sub>2</sub>)]<sub>n</sub>(M = Li, Na, K, <b> 2</b>-<b>4</b>) and two-electron alkali metal reduction affords open-shell, dianionic clusters of the general formula [M<sub>2</sub>(CAAC–CO<sub>2</sub>)]<sub>n </sub>(<b>5</b>-<b>8</b>). It is notable that these crystalline clusters of reduced CO<sub>2</sub> may also be isolated via the “one-pot” reaction of free CO<sub>2</sub> with free CAAC followed by the addition of alkali metals – a reductive process which does not occur in the absence of carbene. Each of the products <b>2</b>-<b>8</b> were investigated using a combination of experimental and theoretical methods.<br>

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