Effects of pH Value, Reaction Time, and Filling Pressure on the Hydrothermal Synthesis of ZnFe2O4 Nanoparticles

2015 ◽  
Vol 51 (11) ◽  
pp. 1-4 ◽  
Author(s):  
Pil Sun Yoo ◽  
Bo Wha Lee ◽  
Chunli Liu
Keyword(s):  
Reaction Time ◽  
Hydrothermal Synthesis ◽  
Ph Value ◽  
Filling Pressure ◽  
Effects Of Ph

The Preparation Technique of Nanometer Molybdenum Trioxide by Hydrothermal Synthesis

2011 ◽  
Vol 117-119 ◽  
pp. 807-810
Author(s):  
Ji Wen Li ◽  
Yan Hua Ma ◽  
Fang Fang Gong ◽  
Guo Shang Zhang ◽  
Liu Jie Xu ◽  
...  
Keyword(s):  
Reaction Time ◽  
Hydrothermal Synthesis ◽  
Reaction Temperature ◽  
Molybdenum Trioxide ◽  
Ph Value ◽  
Ultrafine Particle ◽  
Preparation Technique ◽  
Optimum Ph ◽  
Optimum Reaction ◽  
Optimal Reaction

The technique of hydrothermal synthesis is used to prepare nanometer molybdenum trioxide through controlling the parameters such as the acidification condition, the reaction temperature, the reaction time and so on. The technique is under high temperature and high pressure by water as the solvent. Synthesized molybdenum trioxide powder is characterized by XRD, SEM, and HRTEM. The optimal reaction time is 40h, the optimum reaction temperature is 170°C, and the optimum pH value is 1.0. The results indicate that powder has an ultrafine particle size, high purity, and narrow size distribution, good fluidity, light agglomerate and is perfect in crystal.

Drug Release Characteristics of P(AA-co-DMAA)/SA Interpenetrating Polymer Network Hydrogels

2011 ◽  
Vol 399-401 ◽  
pp. 1165-1168
Author(s):  
Na Na Wang ◽  
Song Bai Lin ◽  
Ke Ping Wang ◽  
Ai Ru Ke
Keyword(s):  
Reaction Time ◽  
Release Rate ◽  
Ph Value ◽  
Polymer Network ◽  
Phosphate Buffer Solution ◽  
Interpenetrating Polymer Network ◽  
Buffer Solution ◽  
Berberine Hydrochloride ◽  
Effects Of Ph ◽  
The One

P(AA-co-DMAA) superporous drug-loaded hydrogels containing berberine hydrochloride were prepared by dispersion polymerization in foam system with acrylic acid (AA) and N,N-dimethyl acrylamide (DMAA) as monomers. Then sodium alginate (SA) as the second network was added to the system, and P(AA-co-DMAA)/SA interpenetrating polymer network (IPN) hydrogels were formed. The effects of pH value, reaction time between SA and glutaric dialdehyde (GA), the concentration of SA and GA on release behavior of berberine hydrochloride were discussed. The FT-IR spectra showed that P(AA-co-DMAA)/SA IPN hydrogels were synthesized successfully. The inverted fluorescence micrograph of P(AA-co-DMAA)/SA showed that some part of the superporous structures were still retained.The cumulative release profiles showed that the release rates were slightly higher in pH=6.8 phosphate buffer solution (PBS) than the one in pH=1 HCl solution. The release rate was the slowest in distilled water, only 7.3% within 24h. When the reaction time between SA and GA was shortened, the release speed of berberine hydrochloride became faster. The pore size of P(AA-co-DMAA) hydrogels was reduced with the concentration of SA and GA increased, and the release rate decreased due to the more dense network structures.

Hydrothermal Synthesis of Corn Cob-Like LiFePO4/C as High Performance Cathode Material for Lithium Ion Batteries

2014 ◽  
Vol 93 ◽  
pp. 152-157 ◽  
Author(s):  
Mei Lin ◽  
Xiao Wu ◽  
Bo Lei Chen ◽  
Ji Kang Yuan
Keyword(s):  
Reaction Time ◽  
Hydrothermal Synthesis ◽  
Electrochemical Performance ◽  
Cathode Material ◽  
High Performance ◽  
Ph Value ◽  
Lithium Ion ◽  
Liquid Electrolyte ◽  
Corn Cob ◽  
Influence Of Ph

Corn cob-like LiFePO4 (LFP) cathode material was simply synthesized through hydrothermal method using block copolymer (PEG-PPG-PEG) as the surfactant. The influence of pH value and reaction time on the morphology of LFP has been briefly investigated. The presence of copolymer plays an important role in the construction of the hierarchically microstructures. By adjusting the pH value and reaction time, platelet-like, hexagram-like, porous spindle-like and corn cob-like LFP microstructures were obtained. To gain the cell performance of the synthesized LFP, galvanostatic charging-discharging measurement on the as-prepared samples were performed. The porous spindle-like LFP/C shows unexpected electrochemical performance since the spindle-like LFP have large structure which prevents access for the liquid electrolyte. Corn cob-like LFP/C exhibits the best electrochemical performance, discharge specific capacities of 120 mAh g-1 after 100 cycles with capacity retention ratios of 80% at 0.1 C. This work also provides the possibility for further investigation into the shape-dependent electrochemical performance of other materials by optimizing the experimental parameters during hydrothermal synthesis.

Batch Supercritical Hydrothermal Synthesis of CeO2 Nanoparticles

2011 ◽  
Vol 284-286 ◽  
pp. 773-780
Author(s):  
Dan Zhao ◽  
Da Liang Li ◽  
Xin Qiang Wu ◽  
En Hou Han
Keyword(s):  
Reaction Time ◽  
Hydrothermal Synthesis ◽  
Reaction Temperature ◽  
Ph Value ◽  
Synthesis Method ◽  
Additional Treatment ◽  
Reactant Concentration ◽  
Size And Morphology ◽  
Supercritical Hydrothermal Synthesis

CeO2 nanoparticles with diameter of about 5 nm were prepared by batch supercritical hydrothermal synthesis method at 390 °C without additional treatment. It was found that the characteristics of products depended on the pH value, reactant concentration (C0), and reaction temperature. The reaction time and coexisting cations (Li+, Na+ and K+) had little effect on the size and morphology of CeO2 particles. Uniform CeO2 nanoparticles were synthesized at 390 °C, pH = 9 and C0 = 0.06 M. The mechanism for batch supercritical hydrothermal synthesis of CeO2 nanoparticles is discussed.

DIP quality influenced by process water quality

TAPPI Journal ◽  
2014 ◽  
Vol 13 (9) ◽  
pp. 51-60
Author(s):  
DENNIS VOSS ◽  
HANS-JOACHIM PUTZ ◽  
SAMUEL SCHABEL
Keyword(s):  
Water Quality ◽  
Surface Tension ◽  
Ph Value ◽  
Water Hardness ◽  
Process Water ◽  
Test Results ◽  
Negative Effects ◽  
Water Parameters ◽  
Effects Of Ph ◽  
Contamination Levels

The need for deinking mills to reduce their fresh water consumption has resulted in higher loads of various contaminants in the process water. Lower recovered paper quality also leads to higher contamination levels in the mills. This higher load has an influence on achievable target brightness. The objective of the work was to determine and explain the main reasons for relatively poor deinked pulp quality or poor deinking potential based on the influence of recovered paper composition and process water quality. The process water parameters significantly affect the deinking potential of recovered paper. The test results showed the negative effects of increased water hardness. For standard recovered paper mixtures, flotation selectivity is higher with increasing flotation pH-value. Good results were realized for standard recovered paper with low hardness, low surface tension, and high pH-value. The results for recovered paper containing flexo newsprint could be slightly improved with low hardness, low surface tension, and low pH-value. The results of the test program using design of experiments showed interacting effects of pH-value and surface tension on luminosity and flotation selectivity.

Effects of pH Value in the Electrolyte on the Properties of Cu2ZnSnS4Thin Film Fabricated by Single Step Co-Electrodeposition

2016 ◽  
Vol 5 (9) ◽  
pp. P521-P525 ◽  
Author(s):  
Hong Zhang ◽  
Shuying Cheng ◽  
Jinling Yu ◽  
Yunfeng Lai ◽  
Haifang Zhou ◽  
...  
Keyword(s):  
Ph Value ◽  
Single Step ◽  
Effects Of Ph

scholarly journals Study on Chromaticity Removal from Mineral Processing Wastewater with Salicylic Hydroxamic Acid by Granular Activated Carbon Catalyzed Ozonation

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 359
Author(s):  
Liping Zhang ◽  
Shengnian Wu ◽  
Nan Zhang ◽  
Ruihan Yao ◽  
Eryong Wu
Keyword(s):  
Activated Carbon ◽  
Reaction Time ◽  
Hydroxamic Acid ◽  
Ph Value ◽  
Oxygen Demand ◽  
Granular Activated Carbon ◽  
Mineral Processing ◽  
Ultraviolet Absorption Spectrum ◽  
Experimental Conditions ◽  
Removal Ratio

Salicylic hydroxamic acid is a novel flotation reagent used in mineral processing. However, it impacts the flotation wastewater leaving behind high chromaticity which limits its reuse and affects discharge for mining enterprises. This study researched ozonation catalyzed by the granular activated carbon (GAC) method to treat the chromaticity of the simulated mineral processing wastewater with salicylic hydroxamic acid. The effects of pH value, ozone (O3) concentration, GAC dosage, and reaction time on chromaticity and chemical oxygen demand (CODCr) removal were discussed. The results of individual ozonation experiments showed that the chromaticity removal ratio reached 79% and the effluent chromaticity exceeded the requirement of reuse and discharge when the optimal experimental conditions were pH value 3, ozone concentration 6 mg/L, and reaction time 40 min. The orthogonal experimental results of catalytic ozonation with GAC on chromaticity removal explained that the chromaticity removal ratio could reach 96.36% and the chromaticity of effluent was only 20 when the optimal level of experimental parameters was pH value 2.87, O3 concentration 6 mg/L, GAC dosage 0.06 g/L, reaction time 60 min respectively. The degradation pathway of salicylic hydroxamic acid by ozonation was also considered based on an analysis with ultraviolet absorption spectrum and high-performance liquid chromatography (HPLC).

Effects of pH value on the formation of volatiles of Shiitake (Lentinus edodes), an edible mushroom

1984 ◽  
Vol 32 (5) ◽  
pp. 999-1001 ◽  
Author(s):  
Chu Chin Chen ◽  
Su Der Chen ◽  
Jer Jeun Chen ◽  
Chung May Wu
Keyword(s):  
Ph Value ◽  
Edible Mushroom ◽  
Lentinus Edodes ◽  
Effects Of Ph

Effects of pH Value on the Stress Corrosion Cracking of Super 13Cr Tubing Steel

2012 ◽  
Vol 557-559 ◽  
pp. 127-130 ◽  
Author(s):  
Xiao Fei Yao ◽  
Fa Qin Xie ◽  
Xiang Qing Wu ◽  
Yi Fei Wang
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Acidic Medium ◽  
Ph Value ◽  
Fracture Morphology ◽  
Corrosion Cracking ◽  
Nacl Solution ◽  
Susceptibility Index ◽  
Experiment Method ◽  
Effects Of Ph

Effects of pH value on the stress corrosion cracking (SCC) of super 13Cr tubing steel were investigated in 3.5% NaCl solution, that mechanics properties and fracture morphology and SCC resistance and stress corrosion cracking susceptibility index (kscc) were analyzed by slow strain rate tensile (SSRT) stress corrosion cracking experiment method and σ-ε curve and SEM. the results Effects of pH value on the stress corrosion cracking (SCC) of super 13Cr tubing steel were investigated in 3.5% NaCl solution, that mechanics properties and fracture morphology and SCC resistance and stress corrosion cracking susceptibility index (kscc) were analyzed by slow strain rate tensile (SSRT) stress corrosion cracking experiment method and σ-ε curve and SEM. the results showed that super 13Cr tubing steel has good properties of resistance stress corrosion cracking in acidic medium, effects of pH value on super13Cr tubing steel resistance stress corrosion was not very obviously in the acidic medium, with pH value decreased, super 13Cr tubing steel tensile strength decreased, elongation rate decreased, fracture area contraction ratio decreased, break time reduced, the tendency of the stress corrosion cracking increased. the stress corrosion cracking susceptibility index kσ and kε were all increasing, that increased degree of kε were obviously than kσ, effects of pH value on the plastic deformation of super 13Cr tubing steel were greater than tensile strength.

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