scholarly journals Efficient Synthesis of Alkali Borohydrides from Mechanochemical Reduction of Borates Using Magnesium–Aluminum-Based Waste

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1061 ◽  
Author(s):  
Thi Thu Le ◽  
Claudio Pistidda ◽  
Julián Puszkiel ◽  
Chiara Milanese ◽  
Sebastiano Garroni ◽  
...  
Keyword(s):  
Sodium Borohydride ◽  
Mechanical Milling ◽  
Argon Atmosphere ◽  
High Conversion ◽  
Efficient Synthesis ◽  
Conversion Yield ◽  
Lithium Borohydride ◽  
Molar Ratios ◽  
Milling Parameters ◽  
High Conversion Yield

Lithium borohydride (LiBH4) and sodium borohydride (NaBH4) were synthesized via mechanical milling of LiBO2, and NaBO2 with Mg–Al-based waste under controlled gaseous atmosphere conditions. Following this approach, the results herein presented indicate that LiBH4 and NaBH4 can be formed with a high conversion yield starting from the anhydrous borates under 70 bar H2. Interestingly, NaBH4 can also be obtained with a high conversion yield by milling NaBO2·4H2O and Mg–Al-based waste under an argon atmosphere. Under optimized molar ratios of the starting materials and milling parameters, NaBH4 and LiBH4 were obtained with conversion ratios higher than 99.5%. Based on the collected experimental results, the influence of the milling energy and the correlation with the final yields were also discussed.

Scandium(iii) triflate-promoted serine/threonine-selective peptide bond cleavage

2017 ◽  
Vol 53 (23) ◽  
pp. 3311-3314 ◽  
Author(s):  
Jizhi Ni ◽  
Youhei Sohma ◽  
Motomu Kanai
Keyword(s):  
Bond Cleavage ◽  
Peptide Bond ◽  
High Conversion ◽  
Selective Hydrolysis ◽  
Conversion Yield ◽  
Peptide Bonds ◽  
Peptide Bond Cleavage ◽  
High Conversion Yield ◽  
Site Selective ◽  
Hydrolysis Of

The site-selective hydrolysis of peptide bonds at Ser and Thr positions was promoted by scandium(iii) triflate with a high conversion yield.

Scalable and Cost-Effective Preparation of Hierarchical Porous Silicon with a High Conversion Yield for Superior Lithium-Ion Storage

2016 ◽  
Vol 4 (5) ◽  
pp. 593-599 ◽  
Author(s):  
Xiaolin Liu ◽  
Rongrong Miao ◽  
Jun Yang ◽  
Jinzuan Wang ◽  
Yitian Bie ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Lithium Ion ◽  
Cost Effective ◽  
High Conversion ◽  
Conversion Yield ◽  
Hierarchical Porous ◽  
Ion Storage ◽  
High Conversion Yield

Morphological and Thermophysical Behavior of Hidroxyapatite Powders Processed by Mechanical Milling

2018 ◽  
Vol 27 ◽  
pp. 22-31
Author(s):  
Oana Gîngu ◽  
Ionela Gabriela Bucse ◽  
Nicoleta Cioatera ◽  
Elena Adriana Voinea ◽  
Petre Rotaru
Keyword(s):  
Thermal Effects ◽  
Mechanical Milling ◽  
Milling Process ◽  
Argon Atmosphere ◽  
Raw Material ◽  
Process Conditions ◽  
Milling Parameters ◽  
Hydroxyapatite Powder ◽  
Powder Particles ◽  
Scanning Electron

The current research represents one section of our studies concerning the improvement of the biocompatibility related to the biocomposite materials for bone grafts application. The submicronic/nanometric hydroxyapatite stands for the progress in biocompatibility. This study highlights the wet mechanical milling process and its effects on the morphological and thermophysical properties of the hydroxyapatite powder particles (30-50µm as raw material) obtained by this method (500 nm average). The scanning electron microscope (SEM) with energy dispersive spectroscopy (EDS) facility point out the morphological and chemical compositional features of the processed powders during 10 hours in dry argon atmosphere. The thermal analysis (TA) in argon atmosphere, too, reveals the influence of the milling parameters on the thermal effects generated by the processed hydroxyapatite powders. The experimental results of our research validate some milling mechanisms reported by the literature for wet/dry mechanochemical process conditions.

scholarly journals Dithienylethene metallodendrimers with high photochromic efficiency

2020 ◽  
Author(s):  
Yu-Xuan Wang ◽  
Qi-Feng Zhou ◽  
Lin Xu ◽  
Xiaoxiao He ◽  
Ying Zhang ◽  
...  
Keyword(s):  
Fatigue Resistance ◽  
Ring Closure ◽  
Photochromic Property ◽  
High Conversion ◽  
Conversion Yield ◽  
Design And Synthesis ◽  
New Family ◽  
High Conversion Yield ◽  
The Individual

Abstract It has been extremely challenging to achieve multi-photochromic systems with-out affecting the individual photoswitching properties of the constituent units. Herein, we present the design and synthesis of a new family of platinum-acetylide dendrimers containing up to twenty-one photochromic dithienylethene (DTE) units that exhibit both high photochromic efficiency and individual switch-ing properties. Upon irradiation with ultraviolet (UV) and visible (Vis) light, the resultant metallodendrimers display high conversion yield and excellent fatigue resistance. More interestingly, cyclization-cycloreversion kinetics revealed that the photochromic property of each DTE unit in these metallodendrimers is unaf-fected by its neighbor and the full ring-closure of up to twenty-one DTE units in one single dendrimer has been achieved.

Efficient synthesis of glycosylamines in solventless conditions promoted by mechanical milling

RSC Advances ◽  
2014 ◽  
Vol 4 (68) ◽  
pp. 36350-36356 ◽  
Author(s):  
Cédric Epoune Lingome ◽  
Gwladys Pourceau ◽  
Virginie Gobert-Deveaux ◽  
Anne Wadouachi
Keyword(s):  
Mechanical Milling ◽  
Environmentally Friendly ◽  
Efficient Synthesis ◽  
Environmentally Friendly Approach

A mecanosynthesis of glycosylamines under solventless conditions was established. This environmentally friendly approach optimized with l-rhamnose, was investigated using a variety of amines and other carbohydrates.

scholarly journals Borohydride stabilized gold–silver bimetallic nanocatalysts for highly efficient 4-nitrophenol reduction

2019 ◽  
Vol 1 (12) ◽  
pp. 4665-4668 ◽  
Author(s):  
Nathaniel E. Larm ◽  
Jason A. Thon ◽  
Yahor Vazmitsel ◽  
Jerry L. Atwood ◽  
Gary A. Baker
Keyword(s):  
Sodium Borohydride ◽  
Capping Agent ◽  
Molar Ratios ◽  
Highly Efficient ◽  
Nitrophenol Reduction ◽  
Gold Silver ◽  
Bimetallic Nanocatalysts

Bimetallic AuxAg1−x nanoparticles, prepared using sodium borohydride as the sole reducing and capping agent for various NaBH4:metal molar ratios, were investigated as catalysts for 4-nitrophenol reduction.

scholarly journals Porous Materials Based on Poly(methylvinylsiloxane) Cross-Linked with 1,3,5,7-Tetramethylcyclotetrasiloxane in High Internal Phase Emulsion as Precursors to Si-C-O and Si-C-O/Pd Ceramics

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5661
Author(s):  
Jan Mrówka ◽  
Janusz Partyka ◽  
Magdalena Hasik
Keyword(s):  
Polymer Nanocomposites ◽  
Pd Nanoparticles ◽  
Argon Atmosphere ◽  
Polymer Materials ◽  
Cross Linking ◽  
Porous Si ◽  
High Internal Phase Emulsion ◽  
Molar Ratios ◽  
Internal Phase ◽  
Vinyl Group

Polysiloxane networks were prepared by hydrosilylation of poly(methylvinylsiloxane) (V3 polymer) with 1,3,5,7-tetramethylcyclotetrasiloxane (D4H) at various Si-Vinyl: Si-H groups molar ratios in water-in-oil high internal phase emulsion (HIPE). Curing the emulsions followed by removal of water led to foamed cross-linked polysiloxane systems differing in the cross-linking degrees, as well as residual Si-H and Si-Vinyl group concentrations. Treatment of thus obtained materials in Pd(OAc)2 solution in tetrahydrofuran resulted in the formation of porous palladium/polymer nanocomposites with different Pd contents (1.09–1.70 wt %). Conducted investigations showed that pyrolysis of the studied materials at 1000 °C in argon atmosphere leads to porous Si-C-O and Si-C-O/Pd ceramics containing amorphous carbon and graphitic phases. Thermogravimetric (TG) analysis of the starting cross-linked polymer materials and those containing Pd nanoparticles revealed that the presence of palladium deteriorates thermal stability and decreases ceramic yields of preceramic networks. The extent of this effect depends on polymer cross-linking density in the system.

scholarly journals Enrichment of Polyglucosylated Isoflavones from Soybean Isoflavone Aglycones Using Optimized Amylosucrase Transglycosylation

Molecules ◽  
2020 ◽  
Vol 25 (1) ◽  
pp. 181 ◽  
Author(s):  
Young Sung Jung ◽  
Ye-Jin Kim ◽  
Aaron Taehwan Kim ◽  
Davin Jang ◽  
Mi-Seon Kim ◽  
...  
Keyword(s):  
Soy Isoflavones ◽  
Reaction Conditions ◽  
Conversion Yield ◽  
Solubility In Water ◽  
Soybean Extract ◽  
Deinococcus Geothermalis ◽  
High Conversion Yield ◽  
Processing And Storage ◽  
And Storage ◽  
Optimal Reaction

Isoflavones in soybeans are well-known phytoestrogens. Soy isoflavones present in conjugated forms are converted to aglycone forms during processing and storage. Isoflavone aglycones (IFAs) of soybeans in human diets have poor solubility in water, resulting in low bioavailability and bioactivity. Enzyme-mediated glycosylation is an efficient and environmentally friendly way to modify the physicochemical properties of soy IFAs. In this study, we determined the optimal reaction conditions for Deinococcus geothermalis amylosucrase-mediated α-1,4 glycosylation of IFA-rich soybean extract to improve the bioaccessibility of IFAs. The conversion yields of soy IFAs were in decreasing order as follows: genistein > daidzein > glycitein. An enzyme quantity of 5 U and donor:acceptor ratios of 1000:1 (glycitein) and 400:1 (daidzein and genistein) resulted in high conversion yield (average 95.7%). These optimal reaction conditions for transglycosylation can be used to obtain transglycosylated IFA-rich functional ingredients from soybeans.

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