Effect of pH in Systems on Crystallinity and Morphology of Synthesized Xonotlite Whiskers

2011 ◽  
Vol 382 ◽  
pp. 384-387 ◽  
Author(s):  
Fei Liu ◽  
Xiao Dan Wang ◽  
Jian Xin Cao
Keyword(s):  
Ph Value ◽  
Effect Of Ph ◽  
Synthesis Conditions ◽  
Ph Values

The different pH values in CaO-SiO2-H2O systems were taken into account to prepare xonotlite whiskers without any surfactant, special instruments and synthesis conditions. Effect of pH values in system on the crystallinity and morphology of synthesized xonotlite whiskers was studied by using XRD and SEM techniques. The results indicated that the different pH values in system had little effect on the crystallinity of synthesized xonotlite, but posed significant impact on the morphology of xonotlite whiskers. The higher pH value is, the lager scale xonotlite whiskers appear. Little whiskers were synthesized in the system of pH 11.5, but in the system of pH 13.0, the formation of xonotlite whiskers was promoted and xonotlite whiskers with 20-40 μm in length and 400 nm in diameter were prepared at 225 °C for 15 h.

Preparation of Xonotlite Whiskers from Carbide Slag

2010 ◽  
Vol 434-435 ◽  
pp. 787-789
Author(s):  
Fei Liu ◽  
Ling Ke Zeng ◽  
Jian Xin Cao ◽  
Qian Lin ◽  
Jing Li
Keyword(s):  
Ph Value ◽  
Raw Materials ◽  
Removal Rate ◽  
Hydrothermal Conditions ◽  
Hydrothermal Route ◽  
Synthesis Conditions ◽  
Ph Values ◽  
Carbide Slag ◽  
Xrd Techniques ◽  
First Time

Carbide slag was used as raw materials for the first time to prepare xonontlite whiskers via a hydrothermal route without special instruments and synthesis conditions. And the effect of pH value of emulsion of carbide slag and hydrothermal conditions on removal rate of impurities, morphology and crystallinity of synthesized xonotlite whiskers were explored using ICP, SEM and XRD techniques. The results indicated that the carbide slag after purification could be used to prepare xonotlite whiskers, and different pH values of emulsion of carbide slag had great impact on the removal rate of impurities and morphology of xonotlite whiskers. Xonotlite whiskers with 20-40 μm in length and 100-500 nm in diameter were hydrothermally synthesized at 230 °C for 15 h with using silicic acid as kiesel material.

Effect of pH and Chemical Surfactant on Thermal Conductivity Enhancement of Cu-H2O Nanofluids

2008 ◽  
Author(s):  
Xinfang Li ◽  
Dongsheng Zhu ◽  
Xianju Wang ◽  
Nan Wang ◽  
Zhengdong Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Ph Value ◽  
Combined Treatment ◽  
Weight Fraction ◽  
Effect Of Ph ◽  
Conductivity Enhancement ◽  
Practical Applications ◽  
Heat Transfer Fluids ◽  
Ph Values ◽  
Thermal Constants

Nanofluids have been attractive for the last few years with the enormous potential to improve the efficiency of heat transfer fluids. This work focuses on the effect of pH and sodium dodecylbenzenesulfonate (SDBS) surfactant on the thermal conductivity of nanofluids.The thermal conductivity was measured by a Hot Disk Thermal Constants Anlyser. The results showed that the thermal conductivity enhancements of Cu–H2O nanofluids are highly dependent on the weight fraction of nanoparticle, pH values and SDBS surfactant concentration of nano-suspensions. The Cu–H2O nanofluids with an ounce of Cu have noticeably higher thermal conductivity than the base fluid without nanoparticles, For Cu nanoparticles at a weight fraction of 0.001 (0.1 wt %), thermal conductivity was enhanced by up to 10.7%, with an optimal pH value and SDBS concentration for the highest thermal conductivity. Therefore, the combined treatment with both the pH and chemical surfactant is recommended to improve the thermal conductivity for practical applications of nanofluid.

scholarly journals Effect of the Acidic and Alkaline Solutions on K2CrO4 and K2Cr2O7 by Ultraviolet and Visible Measurement

2019 ◽  
Vol 30 (1) ◽  
pp. 221
Author(s):  
Mohammad Radi Mohammad ◽  
Hasanain Saad Azeez
Keyword(s):  
Ph Value ◽  
Red Shift ◽  
Alkaline Solutions ◽  
Visible Spectroscopy ◽  
Solution Ph ◽  
Effect Of Ph ◽  
Ph Values ◽  
Uv Visible

In this work different amount of acidic (HCl) and alkaline (NaOH) solutions were added to stoke solutions of K2CrO4 and K2Cr2O7 to show the effect of pH values on their spectra. The results of UV-Visible spectroscopy shows that, the Changing of solution pH value when drops of HCl were added led to shift wavelength of K2CrO4 spectrum while no change has been occurred in K2Cr2O7 spectrum. However, Changing PH values solution by adding drops of NaOH led to change in wavelength red shift for K2Cr2O7 while no changes has been occurred in spectrum of K2CrO4.

Effect of pH Values on Conversion of Calcite Crystals into Calcium Phosphate Phases in Buffer Solutions

2007 ◽  
Vol 353-358 ◽  
pp. 2183-2186 ◽  
Author(s):  
Ya Ping Guo ◽  
Bao Qiang Li ◽  
Yu Zhou ◽  
De Chang Jia
Keyword(s):  
Calcium Phosphate ◽  
Ph Value ◽  
Octacalcium Phosphate ◽  
Precipitation Reaction ◽  
X Ray Diffraction ◽  
Buffer Solution ◽  
Effect Of Ph ◽  
X Ray ◽  
Buffer Solutions ◽  
Ph Values

Calcium phosphate phases with laminar-plate structure were converted from calcite powders after soaking in phosphate buffer solutions of pH’s 6.0-8.0 at 37 °C for 9 days. The effect of pH values on the conversion of calcite crystals was investigated by X-ray diffraction, scanning electron microscopy and Fourier-transform infrared spectroscopy. If the pH value of a buffer solution is kept at 6.0, calcite powders are converted mainly to dicalcium phosphate dehydrate (DCPD) or octacalcium phosphate (OCP). If the pH value is kept at 6.4 or 7.0, calcite powders are converted mainly to OCP. Hydroxyapatite (HAP) with poorly crystalline can be obtained from calcite powders both by treatment of a basic buffer solution, and by treatment of an acid buffer solution without regulating its pH value during the reaction. The conversion mechanism of calcite crystals is a dissolution-precipitation reaction.

Effect of pH Value on the Electrodeposition Potential of Cu-In Alloy Film

2008 ◽  
Vol 373-374 ◽  
pp. 216-219
Author(s):  
H.X. Yang ◽  
Zhen Lun Song ◽  
Yong Wei Song ◽  
Hui Zhang
Keyword(s):  
Ph Value ◽  
Alloy Film ◽  
Deposition Potential ◽  
Electrochemical Measurements ◽  
Precursor Film ◽  
Effect Of Ph ◽  
Electro Deposition ◽  
Ph Values ◽  
The Relationship

Electro-deposition Cu-In alloy can act as the precursor film to prepare CuInSe2 compound by selenating treatment. The effect of pH value on the electrodeposition potential of Cu-In alloy was investigated by electrochemical measurements in this paper. The relationship between the pH values and deposition potential was analyzed. Then uniform Cu-In alloy film was successfully prepared based on the special potential and pH.

Enhancing the Stability of Asphalt Emulsion Using Environmentally Friendly Cationically Modified Hydroxyethyl Cellulose (CMHEC) at Different Concentrations and pH Values

2021 ◽  
Vol 58 (4) ◽  
pp. 303-310
Author(s):  
Xiaoxi Wang ◽  
Runhan Hou ◽  
Qian Zhang ◽  
Osama M. Darwesh ◽  
Mengyao Gao ◽  
...  
Keyword(s):  
Phase Separation ◽  
Apparent Viscosity ◽  
Ph Value ◽  
Ph Effect ◽  
Environmentally Friendly ◽  
Hydroxyethyl Cellulose ◽  
Asphalt Emulsion ◽  
Effect Of Ph ◽  
Ph Values ◽  
The Stability

Abstract The cationically modified hydroxyethyl cellulose (CMHEC) was synthesized successfully and applied for preparing the cationic asphalt emulsion. The apparent viscosity and phase separation of the emulsion were studied at different CMHEC concentrations and pH values. The results indicated that the apparent viscosity of the emulsion was increased with increasing CMHEC concentration, and the phase separation was significantly reduced correspondingly. In addition, the effect of pH value on the emulsion quality was involved. The apparent viscosity of the emulsion showed the tendency to decrease firstly and then increase to the minimum value at pH 2. All results indicated that CMHEC has excellent potential in the manufacture of asphalt emulsion and the research of the pH effect on the formulation of asphalt emulsion has essential significance.

Anti-Depression Effect of Sulphuric Acid on the Flotation of Ilmenite

2012 ◽  
Vol 524-527 ◽  
pp. 935-939
Author(s):  
Bing Liang Xu ◽  
Dian Wen Liu ◽  
Guo Yin Xu
Keyword(s):  
Hydrochloric Acid ◽  
Sulphuric Acid ◽  
Carboxymethyl Cellulose ◽  
Hydroxamic Acid ◽  
Ph Value ◽  
Sodium Carboxymethyl Cellulose ◽  
Depression Effect ◽  
Obvious Effect ◽  
Effect Of Ph ◽  
Ph Values

SYB2# (a category of hydroxamic acid) was employed as the collector of ilmenite flotation. Sodium carboxymethyl cellulose was employed as the depressor of gangue, and sulphuric acid as the pH adjustor of flotation. The effect of pH values on the recovery of ilmenite and gangue was investigated on the condition with (or without) depression respectively. The results demonstrate that pH value does not have any obvious effect on the recovery of ilmenite or gangue when no depressor is added. On the contrary, the pH value plays an important role in ilmenite flotation when depressor is added. To be specific, the recovery of ilmenite increases obviously with pH value decreasing. Having a comparison among the recoveries of ilmenite with different pH values adjusted by sulphuric acid, hydrochloric acid and nitrating acid, it is concluded that sulphuric acid produces anti-depression effect on ilmenite depressed by sodium carboxymethyl cellulose.

scholarly journals THE EFFECT OF pH AND OE CERTAIN MINOR ELEMENTS ON THE GROWTH OE PINEAPPLES IN WATER CULTURES

1969 ◽  
Vol 26 (3) ◽  
pp. 63-72
Author(s):  
N. A. Schappelle
Keyword(s):  
Root System ◽  
Root Development ◽  
Normal Condition ◽  
Ph Value ◽  
Minor Element ◽  
Element Composition ◽  
Effect Of Ph ◽  
Minor Elements ◽  
Ph Values ◽  
Minor Element Composition

1. A pH value of 4.0 to 4.5 was found to be favorable for the growth of the pineapple plant in water cultures. 2. At pH values above 5.0 chlorosis became increasingly severe. 3. The higher pH values promoted excellent root development while those below 4.0 caused a short, stubby root system. 4. Manganese and zinc tended to cause chlorosis which is due to the nonfunctioning of iron in the plant. 5. Aluminum and boron tended to counteract the effect of the manganese and zinc and tended to cause a normal condition of the pineapple plants. 6. Copper added at the rate of 2 p.p.m. controlled a root fungus that caused stunting of the pineapple plants. 7. No correlation between pH value or minor element composition and gummosis of the fruit could be determined.

Effect of pH Value on Synthesis of Calcium Phosphates

2008 ◽  
Vol 47-50 ◽  
pp. 1307-1310 ◽  
Author(s):  
Ya Qin Huang ◽  
Lu Jun Sun ◽  
Ai Hua He ◽  
Qin Qin Wang ◽  
Charles C. Han
Keyword(s):  
Chemical Analysis ◽  
Ph Value ◽  
Calcium Phosphates ◽  
Chemical Precipitation ◽  
Chemical Precipitation Method ◽  
Crystal Phase ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Effect Of Ph ◽  
Ph Values

The effect of pH value at different initial Ca/P molar ratio on the composition and crystal phase of the calcium phosphates synthesized through chemical precipitation method was studied in detail. After calcining at 900°C, the products were characterized by XRD and chemical analysis. The results showed that the composition and crystal phase of the resultant powders can be controlled by pH value at different initial Ca/P molar ratio. When Ca/P molar ratio was 1.667, pure HA was obtained at pH values of both 12.0 and 11.0. When initial Ca/P molar ratio was 1.500, pure β-TCP was obtained at pH value from 11.0 to 9.0. CPP was obtained at pH value from 6.0 to 4.0 when initial Ca/P molar ratio was 1.000.

Hydrothermal Synthesis of Xonotlite Fibers and Investigation on their Thermal Property

2010 ◽  
Vol 105-106 ◽  
pp. 841-843 ◽  
Author(s):  
Fei Liu ◽  
Ling Ke Zeng ◽  
Jian Xin Cao ◽  
Bo Zhu ◽  
An Yuan
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Hydrothermal Synthesis ◽  
Thermal Property ◽  
Ph Value ◽  
Potential Candidate ◽  
Hydrothermal Route ◽  
Synthesis Conditions ◽  
Ph Values ◽  
Large Size

A hydrothermal route for preparing large size xonotlite fibers without special instruments and synthesis conditions was development. Effect of pH values in system on the crystal phase and morphology of synthesized xonotlite fibers was studied by using XRD and SEM. The results indicated that the different pH systems have little effect on the crystallinity of synthesized xonotlite, but have great impact on the morphology of xonotlite fibers. The higher pH value is, the lager scale xonotlite fibers appear when the pH values are among 12.0, 12.5, 13.0 and 13.5. The formation of xonotlite fibers was promoted and xonotlite fibers with 10-30 μm in length and 100-200 nm in diameter were prepared at 220 °C for 15 h in the system of pH 13.5. The evaluation of thermal property revealed that synthesized fibers were excellent in thermal stability at high temperature, and could be potential candidate as reinforcement reagents in composite areas.

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