A nickel-phyllosilicate core–echinus catalyst via a green and base additive free hydrothermal approach for hydrogenation reactions

2017 ◽  
Vol 53 (75) ◽  
pp. 10358-10361 ◽  
Author(s):  
Bing Ma ◽  
Huimei Cui ◽  
Chen Zhao
Keyword(s):  
Single Crystalline ◽  
Free Process ◽  
Hydrogenation Reactions ◽  
Basic Additive ◽  
Hydrothermal Approach

We report a new hydrothermal and basic-additive free process for synthesizing a core(single-crystalline HBEA zeolite)–echinus(nickel phyllosilicate) catalyst, which exhibits excellent reactivity and stability for hydrogenation reactions.

Structural- and optical-properties analysis of single crystalline hematite (α-Fe2O3) nanocubes prepared by one-pot hydrothermal approach

CrystEngComm ◽  
2016 ◽  
Vol 18 (25) ◽  
pp. 4720-4732 ◽  
Author(s):  
Nur Maisarah Abdul Rashid ◽  
Choonyian Haw ◽  
Weesiong Chiu ◽  
Noor Hamizah Khanis ◽  
Aliff Rohaizad ◽  
...  
Keyword(s):  
Optical Properties ◽  
Hydrothermal Method ◽  
Morphological Evolution ◽  
Time Dependent ◽  
Structural And Optical Properties ◽  
High Quality ◽  
One Pot ◽  
Single Crystalline ◽  
Evolution Analysis ◽  
Hydrothermal Approach

Time-dependent morphological evolution analysis shows high quality crystalline α-Fe2O3 nanocubes can be precisely tuned and synthesized by a facile, green, yet straightforward strategy via a hydrothermal method.

scholarly journals Trifluoroacetic Acid Hydroxylamine System as Organocatalyst Reagent in a One-Pot Salt Free Process for the Synthesis of Caprolactam and Amides of Industrial Interest

2021 ◽  
Author(s):  
F. Manente ◽  
L. Pietrobon ◽  
L. Ronchin ◽  
A. Vavasori
Keyword(s):  
Trifluoroacetic Acid ◽  
Room Temperature ◽  
Beckmann Rearrangement ◽  
One Pot ◽  
Free Process ◽  
Hydrogenation Reactions ◽  
One Step ◽  
The One ◽  
Industrial Relevance

AbstractIn this work we studied the reactivity of the Trifluoroacetic acid hydroxylamine system in the one step salt free synthesis of amides from ketones. A particular regards was paid to the caprolactam synthesis because of its industrial relevance. Synthesis, reactivity and characterization of the hydroxylamine trifluoroacetate is given. Fast oximation reaction of several ketones was gained at room temperature (1 h of reaction quantitative conversion for several ketones). In the same reactor, by raising the temperature at 383 K, the Beckmann rearrangement of the so obtained oximes is easily accomplished in the presence of three equivalent of TFA. The possibility of obtaining the trifluoroacetate of the hydroxylamine with a modified nitric acid hydrogenation reactions was verified, too. Reuse of solvent and trifluoroacetic acid is easily achieved by distillation. Graphical abstract Salt free one-pot caprolactam and amides process catalyzed by CF3COOH, in the presence of NH2OH TFA as the oximation agent.

Facile synthesis of single-crystalline NiO nanosheet arrays on Ni foam for high-performance supercapacitors

CrystEngComm ◽  
2014 ◽  
Vol 16 (14) ◽  
pp. 2878-2884 ◽  
Author(s):  
Ming Huang ◽  
Fei Li ◽  
Jun Yi Ji ◽  
Yu Xin Zhang ◽  
Xiao Li Zhao ◽  
...  
Keyword(s):  
High Performance ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
Cost Effective ◽  
Ni Foam ◽  
Single Crystalline ◽  
Nanosheet Arrays ◽  
Binder Free ◽  
Hydrothermal Approach ◽  
Good Rate Capability

Single-crystalline NiO nanosheet arrays on Ni foam as a binder-free electrode for high-performance supercapacitors, fabricated by a facile and cost-effective hydrothermal approach, exhibit a high specific capacitance, good rate capability, and excellent cycling stability.

Surfactant-assisted synthesis of lanthanide phosphates single-crystalline nanowires/nanorods

2004 ◽  
Vol 19 (10) ◽  
pp. 2807-2811 ◽  
Author(s):  
Wen-Bo Bu ◽  
Zi-Le Hua ◽  
Ling-Xia Zhang ◽  
Hang-Rong Chen ◽  
Wei-Min Huang ◽  
...  
Keyword(s):  
Near Infrared ◽  
Single Crystalline ◽  
Lanthanide Phosphate ◽  
Pluronic P123 ◽  
Good Crystallinity ◽  
Lanthanide Compound ◽  
Significant Step ◽  
Hydrothermal Approach ◽  
Uniform Diameter ◽  
Surfactant Assisted

A facile, surfactant-assisted, hydrothermal approach has been developed to synthesize lanthanide phosphate single-crystalline nanowires/nanorods with smooth surface, uniform diameter, and good crystallinity. The surfactant Pluronic P123 was found to play a crucial role on the uniform morphology of lanthanide phosphate single-crystalline nanowires/nanorods. Photoluminescence spectra of the lanthanide phosphate single-crystalline nanowires/nanorods show that these nanowires/nanorods have strong photoluminescent emissions in the ultraviolet-visible and near-infrared regions. The present work is a preliminary and significant step toward the potential luminescent and catalytic applications of lanthanide compound based one-dimensional nanostructures.

scholarly journals Controllable Synthesis of Single-Crystalline CdO and Cd(OH)2 Nanowires by a Simple Hydrothermal Approach

2010 ◽  
Vol 5 (6) ◽  
pp. 961-965 ◽  
Author(s):  
Zai-xing Yang ◽  
Wei Zhong ◽  
Yan-xue Yin ◽  
Xin Du ◽  
Yu Deng ◽  
...  
Keyword(s):  
Controllable Synthesis ◽  
Single Crystalline ◽  
Hydrothermal Approach

“Preparation of Single Crystalline Gold Films for ED Studies”

1972 ◽  
Vol 30 ◽  
pp. 634-635
Author(s):  
Joseph D. C. Peng
Keyword(s):  
Crystal Morphology ◽  
Diffraction Theory ◽  
Scattering Matrix ◽  
Vacuum Evaporation ◽  
Gold Films ◽  
Matrix Formulation ◽  
Silver Films ◽  
Single Crystalline ◽  
Grating Pattern ◽  
Stacking Disorder

The relative intensities of the ED spots in a cross-grating pattern can be calculated using N-beam electron diffraction theory. The scattering matrix formulation of N-beam ED theory has been previously applied to imperfect microcrystals of gold containing stacking disorder (coherent twinning) in the (111) crystal plane. In the present experiment an effort has been made to grow single-crystalline, defect-free (111) gold films of a uniform and accurately know thickness using vacuum evaporation techniques. These represent stringent conditions to be met experimentally; however, if a meaningful comparison is to be made between theory and experiment, these factors must be carefully controlled. It is well-known that crystal morphology, perfection, and orientation each have pronounced effects on relative intensities in single crystals.The double evaporation method first suggested by Pashley was employed with some modifications. Oriented silver films of a thickness of about 1500Å were first grown by vacuum evaporation on freshly cleaved mica, with the substrate temperature at 285° C during evaporation with the deposition rate at 500-800Å/sec.

Improvement of cytoprotective and antioxidant activity of Rosa canina L. and Salix alba L. by controlled differential sieving process against H2O2-induced oxidative stress in mouse primary splenocytes

2017 ◽  
Vol 87 (3-4) ◽  
pp. 191-200 ◽  
Author(s):  
Nidhal Soualeh ◽  
Aliçia Stiévenard ◽  
Elie Baudelaire ◽  
Rachid Soulimani ◽  
Jaouad Bouayed
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Activities ◽  
Biological Activities ◽  
Good Alternative ◽  
Activity Levels ◽  
Salix Alba ◽  
Rosa Canina ◽  
Free Process ◽  
Plant Powders ◽  
Sieving Process

Abstract. In this study, cytoprotective and antioxidant activities of Rosa canina (RC) and Salix alba (SA), medicinal plants, were studied on mouse primary splenocytes by comparing Controlled Differential Sieving process (CDSp), which is a novel green solvent-free process, versus a conventional technique, employing hydroethanolic extraction (HEE). Thus, preventive antioxidant activity of three plant powders of homogeneous particle sizes, 50–100 µm, 100–180 µm and 180–315 µm, dissolved directly in the cellular buffer, were compared to those of hydroethanolic (HE) extract, at 2 concentrations (250 and 500 µg/mL) in H2O2-treated spleen cells. Overall, compared to HE extract, the superfine powders, i. e., fractions < 180 µm, at the lowest concentration, resulted in greater reactive oxygen species (ROS) elimination, increased glutathione peroxidase (GPx) activity and lower malondialdehyde (MDA) production. Better antioxidant and preventive effects in pre-treated cells were found with the superfine powders for SA (i. e., 50–100 µm and 100–180 µm, both p < 0.001), and with the intermediate powder for RC (i. e., 100–180 µm, p < 0.05) versus HE extract. The activity levels of catalase (CAT) and superoxide dismutase (SOD) in pretreated splenocytes exposed to H2O2, albeit reduced, were near to those in unexposed cells, suggesting that pretreatment with the fine powders has relatively restored the normal levels of antioxidant-related enzymes. These findings supported that CDSp improved the biological activities of plants, avoiding the use of organic solvents and thus it could be a good alternative to conventional extraction techniques.

Recombination Characteristics of Single-Crystalline Silicon Wafers with a Damaged Near-Surface Layer

2013 ◽  
Vol 58 (2) ◽  
pp. 142-150 ◽  
Author(s):  
A.V. Sachenko ◽  
◽  
V.P. Kostylev ◽  
V.G. Litovchenko ◽  
V.G. Popov ◽  
...  
Keyword(s):  
Surface Layer ◽  
Crystalline Silicon ◽  
Silicon Wafers ◽  
Single Crystalline Silicon ◽  
Near Surface ◽  
Single Crystalline
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