The Preparation of Magnesium Hydroxide Whiskers

2017 ◽  
Vol 726 ◽  
pp. 350-354 ◽  
Author(s):  
Qing Li Ren ◽  
Qiang Luo
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Magnesium Hydroxide ◽  
Hydrothermal Conditions ◽  
Preparation Technology

The magnesium hydroxide whiskers,its length being about 30μm and its diameter being about 3μm, was prepared by hydrothermal conditions. The effect of preparation technology, which includes the reaction temperature and reaction time, was discussed according to the results of XRD, TEM, and SEM. Moreover, the mechanism of the preparation of magnesium hydroxide whiskers was studied.

The Influence of the Hydrothermal Conditions on the Morphologies of β-Ni(OH)2

2012 ◽  
Vol 562-564 ◽  
pp. 494-497
Author(s):  
Xiao Ming Fu
Keyword(s):  
Electron Microscope ◽  
High Temperature ◽  
Reaction Time ◽  
Scanning Electron Microscope ◽  
Reaction Temperature ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
X Ray ◽  
Low Reaction Temperature ◽  
Scanning Electron

Flower-like β-Ni(OH)2 and nanoflakes have been successfully synthesized with nickel nitrate as nickel source and stronger ammonia water as precipitant via the hydrothermal method. The phase and the morphologies of the samples have been characterized and analyzed by XRD (X-ray diffraction) and SEM (Scanning electron microscope), respectively. XRD shows that the phase of the samples is β-Ni(OH)2. SEM confirms that The low reaction temperature is propitious to the synthesis of flower-like β-Ni(OH)2, and with the increase of the reaction time the nanoflakes of flower-like β-Ni(OH)2 become much thinner. However, The high temperature is in favor of the synthesis of β-Ni(OH)2 nanosflakes, and with the further increase of the reaction temperature.

Hydrothermal Conversion of Glucose into Lactic Acid with Nickel as a Catalyst

2011 ◽  
Vol 347-353 ◽  
pp. 3873-3876
Author(s):  
Adama Yousif ◽  
Xu Zeng ◽  
Fang Ming Jin ◽  
Yan Fang
Keyword(s):  
Lactic Acid ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Efficient Method ◽  
Optimum Conditions ◽  
Hydrothermal Conditions ◽  
Hydrothermal Conversion ◽  
Acid Yield

In this paper, an efficient method for producing lactic acid from glucose with nickel as a catalyst under hydrothermal conditions has been developed. The addition of nickel can improve the lactic acid yield efficiently under alkaline hydrothermal conditions. The highest lactic acid yield of 35% was obtained under the optimum conditions, i.e., reaction temperature 300 °C, reaction time 60 s, 0.5 mmol nickel and 2.5 M NaOH.

scholarly journals Optimized preparation of quassinoids rich Eurycoma longifolia Jack, TAF2-phospholipid complex and its effects on oral bioavailability

2021 ◽  
Vol 15 ◽  
Author(s):  
Wu-Yan Guo ◽  
Shu-Yan Wang ◽  
Jian Ren ◽  
Bo Zhang
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Oral Bioavailability ◽  
Design Method ◽  
Relative Bioavailability ◽  
Preparation Condition ◽  
Phospholipid Complex ◽  
Preparation Technology ◽  
Eurycoma Longifolia ◽  
Eurycoma Longifolia Jack

Eurycoma longifolia Jack is a plant of the genus Eurycoma in Simaroubaceae. Eurycomanone is one of the main quassinoids of E. longifolia. Unfortunately, these quassinoids exhibit low bioavailability . In the present study, a phospholipid complex (TAF2-PC) was prepared to improve the oral bioavailability of TAF2 (Tongkat Ali Fraction 2). The complexation rate of eurycomanone and phospholipid was used as the index of success in the phospholipid complexes. The effects of reaction solvent, reaction temperature, drug concentration, drug-lipid ratio and reaction time on thecomplexation rate were investigated. Response Surface-Box-Behnken Design Method was performed to optimize the preparation technology and the pharmacokinetics of phospholipid complex of TAF2 were studied in rats. Our results showed that the optimum preparation condition of TAF2-phospholipid complex were as follows: reaction solvent, anhydrous ethanol; reaction time, 1 h; the ratio of TAF2 to phospholipid, 2.28; reaction temperature, 40.85 ℃; TAF2 concentration, 32.66 mg/ml; and complexation rate, 95.04 ± 0.4% (n=3).The results of pharmacokinetic study showed that the relative bioavailability was increased to 209.20% in the TAF2-phospholipid complex-treated rats.Thus,this phospholipid-complex-technique shows potential for enhancing oral bioavailability of poorly absorbed quassinoid-rich E. longifolia extract, TAF2.

Research on Preparation Technology Parameters of Two Organically Modified Bentonites

2012 ◽  
Vol 573-574 ◽  
pp. 283-287
Author(s):  
Xiao Feng Wang
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Laboratory Simulation ◽  
Pig Manure ◽  
Simulation Methods ◽  
Organic Substances ◽  
Mass Ratio ◽  
Preparation Technology ◽  
Organically Modified

This paper adopts the laboratory simulation methods and makes explorations on the best modification parameters of Bentonite affected by two kinds of organic substances, pig manure degradable solution and HDTMA. The best preparation technology condition for pig manure degradable solution modification Bentonite is W pig manure: WBentonite=3:1 (mass ratio). PH is 9. The reaction temperature is 40°C and the reaction time is 4h. The best preparation technology condition for HDTMA modification Bentonite is WHDTMA: WBentonite =1:2 (mass ratio). PH is 7. The reaction temperature is 90°C and the reaction time is 2.5h.

Preparation and Characterization of Mg(OH)2 Flame-Retardant with Particular Morphology via Hydrothermal Process

2011 ◽  
Vol 306-307 ◽  
pp. 1311-1316 ◽  
Author(s):  
Lian Min Ji ◽  
Li Juan Li ◽  
Zhi Qi Liu ◽  
Bo Zhang ◽  
Feng Nie ◽  
...  
Keyword(s):  
Reaction Time ◽  
Flame Retardant ◽  
Reaction Temperature ◽  
Magnesium Hydroxide ◽  
Flame Retardants ◽  
Crystal Morphology ◽  
Hydrothermal Process ◽  
Solution Concentration ◽  
Organic Modifier

The process of preparing magnesium hydroxide flame retardants with particular morphologies after hydrothermal treatment in the presence of organic modifier ethanediamine was mainly investigated. Influences of such factors as slurry concentration, modifier solution concentration and reaction temperature were studied. Meanwhile, the hydrothermally treated results were characterized by XRD, SEM, FTIR and TGA. The results indicate that when the reaction temperature was 180°C, and the reaction time ranges from 4 to 8 hours, the magnesium hydroxide and organic modifier solution concentration separately was 5% and 4 mol/L, a spherical crystalline magnesium hydroxide that has a symmetrical and regular crystal morphology was prepared. Such magnesium hydroxide materials were found to give an enhanced powder filtration.

Effect of Hydrothermal Conditions on the Cation Exchange Capacity of MSWI Fly Ash

2006 ◽  
Vol 510-511 ◽  
pp. 110-113
Author(s):  
Young Sook Shim ◽  
Woo Keun Lee
Keyword(s):  
Fly Ash ◽  
Reaction Time ◽  
Cation Exchange ◽  
Reaction Temperature ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Waste Incinerator ◽  
Liquid Ratio ◽  
Hydrothermal Conditions ◽  
Solid Liquid

In this study, we studied to find the most suitable condition for the preparation of adsorbent by hydrothermal treatment of fly ash from the municipal solid waste incinerator (MSWI). There are many variables that affect the adsorptive characteristics in our study. With the variation of which discussed the effect such as the concentration of NaOH, reaction temperature, reaction time, solid/liquid ratio, and so on. The phase of adsorbent, its morphology and cation exchange capacity (CEC) were analyzed to evaluate their effects. The phase of adsorbent after treatment was identified by X-ray diffraction (XRD), the morphology was examined by scanning electron microscopy (SEM), and the CEC was analyzed by the ammonium acetate method. The maximum CEC value was obtained under the condition of 3N NaOH, 100°C of reaction temperature, 12 hr of reaction time, and 1:10 of solid/liquid ratio. The CEC was 68 meq/100g in this condition, which was 8 times the amount of raw fly ash.

scholarly journals Fabriction of ZnO Nanorods with Strong UV Absorption and Different Hydrophobicity on Foamed Nickel under Different Hydrothermal Conditions

Micromachines ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 164 ◽  
Author(s):  
Xin Li ◽  
Xifang Chen ◽  
Zao Yi ◽  
Zigang Zhou ◽  
Yongjian Tang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Growth Parameters ◽  
Energy Dispersive Spectrometer ◽  
Zno Nanorods ◽  
Solution Concentration ◽  
Hydrothermal Conditions ◽  
Step Method ◽  
Static Contact ◽  
Foamed Nickel

ZnO nanorods have been grown on the surface of foamed nickel by a two-step method. Firstly, a layer of ZnO seed is sputtered on the surface of the foamed nickel by magnetron sputtering, and then the hydrothermal method is used to grow ZnO nanorods at different conditions (solution concentration, reaction time and reaction temperature). The results show that the morphology of ZnO nanorods is closely related to the solution concentration, reaction time, and reaction temperature. The energy band structure formed by the foamed nickel and ZnO seed layers and the growth mechanism of ZnO nanorods are discussed. The samples are characterized by Energy dispersive spectrometer (EDS), X-ray diffraction (XRD), and Raman spectroscopy. The absorption characteristics of samples to light are characterized by ultraviolet-to-visible (UV–VIS) absorption. The hydrophilicity of the samples is characterized by the static contact angle. By analyzing the performance characteristics of the samples at different conditions, we finally obtained the optimal growth parameters. At the optimal parameters, the morphology of the grown nanorods is regular, the ultraviolet band has strong absorption, and the surface of the samples forms a superhydrophobic surface.

Optimization of Magnesium Separation and Extraction from Boron Slurry Using Response Surface Methodology

2011 ◽  
Vol 366 ◽  
pp. 366-369
Author(s):  
Feng Gao ◽  
Rong Fu ◽  
Ming Yang Qian ◽  
Zhu Min Wang ◽  
Xiang Zhang
Keyword(s):  
Response Surface Methodology ◽  
Reaction Time ◽  
Factorial Design ◽  
Response Surface ◽  
Reaction Temperature ◽  
Fractional Factorial Design ◽  
Design Criterion ◽  
Fractional Factorial ◽  
Effective Factors

Response surface methodology was used to optimize the soaking Mg leaching ratio from the boron slurry screened by 25 fractional factorial design. Five effective factors such as H2SO4 concentrations, reaction time, reaction temperature and stir velocity were tested by using 25 fractional factorial design criterion and three effective factors H2SO4 concentrations, reaction time and reaction temperature showed significant effect(P2SO4 concentrations of 0.29mol/l, reaction time of 90 min and reaction temperature of 50°C. Three runs of additional confirmation experiments were conducted. The mixture magnesium leaching value was 58.20%.

Ring-Opening Polymerization of Lactide Using Aluminum Salen-Type Initiators

2014 ◽  
Vol 915-916 ◽  
pp. 713-716
Author(s):  
Qing Zhang ◽  
Jing Tian ◽  
Zhi Qi Cao ◽  
Ru Xia Xu ◽  
Zhen Zhen Sun ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Infrared Spectroscopy ◽  
Reaction Time ◽  
Magnetic Resonance ◽  
Schiff Bases ◽  
Reaction Temperature ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Resonance Spectroscopy ◽  
Aluminum Complex

In this investigation, Schiff bases aluminum complex was synthesized and used as the initiator in the polymerization of D,L-lactide. The aluminum complex was characterized by infrared spectroscopy (IR), and nuclear magnetic resonance spectroscopy (NMR). The influences of different factors, including reaction time, reaction temperature, and the ratio of D, L-lactide/Al3+ on the synthesis of polylactide were described. The results showed that Schiff bases aluminum complex could be successfully applied in the ring opening polymerization. The optimum condition of the ring opening polymerization of D,L-lactide, which included D,L-lactide/Al3+ (mol/mol) ratio of 250, reaction temperature of 120 °C, and reaction time of 16 hours.

scholarly journals Synthesis of propylene carbonate from urea and 1,2-propylene glycol over metal carbonates

2011 ◽  
Vol 17 (3) ◽  
pp. 323-331 ◽  
Author(s):  
Jiancheng Zhou ◽  
Wu Dongfang ◽  
Birong Zhang ◽  
Yali Guo
Keyword(s):  
Reaction Time ◽  
Propylene Glycol ◽  
Propylene Carbonate ◽  
Reaction Temperature ◽  
Reaction Conditions ◽  
Lead Carbonate ◽  
Synthetic Process ◽  
Metal Carbonates ◽  
Optimal Reaction ◽  
Mixed Carbonate

A series of single-metal carbonates and Pb-Zn mixed-metal carbonates were prepared as catalysts for alcoholysis of urea with 1,2-propylene glycol (PG) for the synthesis of propylene carbonate (PC). The mixed carbonates all show much better catalytic activities than the single carbonates, arising from a strong synergistic effect between the two crystalline phases, hydrozincite and lead carbonate. The mixed carbonate with Pb/Zn=1:2 gives the highest yield of PC, followed by the mixed carbonate with Pb/Zn=1:3. Furthermore, Taguchi method was used to optimize the synthetic process for improving the yield of PC. It is shown that the reaction temperature is the most significant factor affecting the yield of PC, followed by the reaction time, and that the optimal reaction conditions are the reaction time at 5 hours, the reaction temperature at 180 oC and the catalyst amount at 1.8 wt%, resulting in the highest PC yield of 96.3%.

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