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.

Study on Influence of Silicate Morphology Based on pH Value

2012 ◽  
Vol 454 ◽  
pp. 324-328
Author(s):  
Yan He ◽  
Ya Jing Liu ◽  
Yong Lin Cao ◽  
Li Xia Zhou
Keyword(s):  
Silicic Acid ◽  
Ph Value ◽  
Colorimetric Method ◽  
Absorption Spectrometry ◽  
Degree Of Polymerization ◽  
Raw Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ph Values ◽  
The Stability

Infra-red absorption spectrometry, X-ray diffraction observations and characterization tests based on silicon molybdenum colorimetric method were used to investigate the optimal pH value controlling the stability of the silicic acid form. The experiment process was done by using sodium silicate as raw material. The results showed that the solution of silicate influenced the polymerization. The active silicic acid solution with a certain degree of polymerization was obtained by controlling the pH values.

Dyeing Properties to Wool Fabrics of Catechu Dye Purified by Micro-Filtration Membrane

2008 ◽  
Vol 12 (1) ◽  
pp. 32-38 ◽  
Author(s):  
Xiuliang Hou ◽  
Li Wei ◽  
Xinlong Zhang ◽  
Huihui Wu ◽  
Qicheng Zhou ◽  
...  
Keyword(s):  
Ph Value ◽  
Wool Fabric ◽  
Color Fastness ◽  
Color Changes ◽  
Ph Values ◽  
Filtration Membrane ◽  
Wool Fabrics ◽  
Characteristic Values ◽  
The Stability ◽  
Different Levels

Catechu liquor, which is deep brown-red in color, was purified with a micro-filtration membrane and the stability of catechu dye to different levels of temperatures and pH were investigated in this paper. The effects of the dyeing conditions on color characteristic values and color fastnesses of the dyed wool fabrics were also investigated. The results show that the liquor of catechu dye is stable at pH values of 3-7 and its color changes to a deeper brown-red when its pH value is above 8. The preferable dyeing conditions for wool fabric with refined powder catechu dye are as follows: dyeing temperature of 100±C, pH value of 6.5 for the dye bath and catechu dye of 1-4% (o.w.f). The dyed wool fabric has good color fastnesses to washing, alkali perspiration and dry rubbing. However, its color fastness rating to wet rubbing is poor, ranging from 2-3. Further research will be needed on this aspect.

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.

Study on Properties of PG Separated and Purified from Actinidia arguta

2013 ◽  
Vol 850-851 ◽  
pp. 1197-1201
Author(s):  
Shu Qian Li ◽  
Chang Jiang Liu ◽  
Guang Xin ◽  
Bo Zhang
Keyword(s):  
Metal Ions ◽  
Ph Value ◽  
Michaelis Constant ◽  
Actinidia Arguta ◽  
Ph Values ◽  
Key Enzyme ◽  
Optimal Reaction Temperature ◽  
The Stability ◽  
Thermo Stability ◽  
Optimal Reaction

Polygalacturonase (PG) is key enzyme for softening consenescence mechanism of fruits. In this work, Properties of PG separated and purified from wildActinidia Argutawere studied. The result shows that the optimal reaction temperature is 40°C with a high enzyme activity around 30-50°C. PG keeps a thermo stability at the temperature ranging from 30-40°C, which decreases with increasing of temperature and PG will lose all its activity under 60-70°C for 1h. The optimal reaction pH value for this enzyme is 5.5. As far as the stability in different pH values is concerned, PG is relatively stable for preservation at pH4.5-6.5.The michaelis constant for PG is 27.31. When the concentration for EDTA is higher than 2mmol/L, it is inhibitive for PG . The metal ions of K+, Ca2+, Fe2+, Fe3+, Mg2+can activate the PG enzyme to some extent, the strength of activation:Mg2+Fe3+K+Fe2+Ca2+;The metal ions of Cu2+Zn2+Mn2+Ba2+Al3+can inhibit PG enzyme to some extent, the strength of inhibition:Al3+Ba2+Mn2+Cu2+Zn2+.

The sorption of lead and cadmium species by clay minerals

1977 ◽  
Vol 30 (7) ◽  
pp. 1417 ◽  
Author(s):  
H Farrah ◽  
WF Pickering
Keyword(s):  
Metal Ion ◽  
Ph Value ◽  
Cadmium Ions ◽  
Ph Values ◽  
Metal Ion Adsorption ◽  
Lead And Cadmium ◽  
Anionic Complexes ◽  
The Stability ◽  
Protonated Ligand ◽  
Ligand Species

The effect of pH changes and the presence of ligands on the uptake of lead and cadmium ions by three types of clay mineral (kaolinite, illite and montmorillonite) has been investigated. ��� In the absence of ligands, metal ion adsorption increases gradually with increasing pH until a threshold pH value is exceeded, whereupon total precipitation/sorption (attributed to formation of hydroxy species) occurs. With ligands present, the threshold point tends to shift to higher pH values, the magnitude of the effect depending on the stability of the metal complex formed. Adsorption of cationic metal complexes is subject to competition from charged protonated ligand species; anionic complexes are not sorbed.

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.

scholarly journals EFFECT OF PH ON THE STABILITY OF COORDINATION COMPOUNDS OF CO(III) WITH DIAMINOETHANOL LIGANDS IN NON-AQUEOUS SOLUTIONS

2020 ◽  
Vol 2 (61) ◽  
pp. 119-127
Author(s):  
I. Kuzevanova ◽  
◽  
S. Povalchyk ◽  
A. Zulfigarov ◽  
A. Andriiko ◽  
...  
Keyword(s):  
Complex Compound ◽  
Coordination Compounds ◽  
Ph Value ◽  
Precursor Solution ◽  
Polynuclear Complex ◽  
Alkaline Solutions ◽  
Partial Hydrolysis ◽  
Ph Values ◽  
The Stability ◽  
Hydrolysis Of

Inner complex compound of cobalt(III) with diaminoethanol, [Co(DetmHdetm)], and polynuclear complex compound 2Co-Ni with diaminoethanol, [Ni(CoDetmHdetm)2](NO3)2, were synthesized. Stabilities of the obtained compounds were investigated in non-aqueous (dimethylformamide) solutions at different values of pH (from acid to alkaline). Methods of potentiometric titration and electron absorption spectra were used to determine the range of pH values where the compounds do not decompose. As a result of these studies, we found that at the upper value of pH=7, the coordination surrounding of the metals (Co(III), Ni(II)) does not change. When the pH value becomes lower than 7 (with adding HCl acide), the inner complex of Co(III) begins to decompose. The ligand H2detm is replaced by Cland partial protonization of diethanolamine occurs. Also, transformation of N,Ncis isomer of inner complex compound of cobalt(III) to N,N-trans isomer takes place, thus reducing the symmetry of the complex. As for the polynuclear complex compound 2Co-Ni, when pH value becomes lower than 7, molecules of solvent begin to react with the products of partially destroyed complex. As a result, new complex compound is formed with the increase of coordination number of nickel(II) from 4 to 6. However, in alkaline solutions where pH values are up to 10, the heterometal complex compound of 2Co-Ni remains stable. Only partial hydrolysis of the solvent occurs in these conditions. The schemes of transformations of [Co(DetmHdetm)] and [Ni(CoDetmHdetm)2](NO3)2 occuring in non-aqueous (dimethylformamide) solutions at different values of pH (from acid to alkaline) are presented in the paper. The results of this study can be used for the preparation of precursor solution for the technology of catalytic materials production. Evidently, the range of pH from 7 to 10 must be maintained in order to avoid the contamination of the final products by the decomposed wastes of complexes and solvent.

Sugar hydrolysis and colour formation in processing

2020 ◽  
pp. 540-548
Author(s):  
Jan Maarten de Bruijn
Keyword(s):  
Ph Value ◽  
Cost Effective ◽  
Production Costs ◽  
Ph Values ◽  
Technological Impact ◽  
The Stability ◽  
The Cost ◽  
Required Quality ◽  
White Sugar ◽  
Sugar Hydrolysis

The stability of the sucrose molecule throughout processing is of the utmost importance, because in principle any sugar loss will increase the production costs per tonne of the obtained white sugar. Colour in processing is an important technological parameter too, since only an adequate colour control in processing allows the cost-effective production of white sugar crystals of the required quality. For process control of both sugar hydrolysis and colour formation it is necessary to understand the effect of pH value, temperature and retention time on these phenomena. This paper will describe the possible causes of sugar hydrolysis and colour, as well as how to control pH values and temperature in processing in order to limit the technological impact of both reactions in which invert sugar plays a central role.

Effect of pH Value of the Broth on the Gelled Microspheres Containing Zirconium Prepared by Internal Gelation Process

2014 ◽  
Vol 602-603 ◽  
pp. 155-158 ◽  
Author(s):  
Yong Gao ◽  
Jing Tao Ma ◽  
Xing Yu Zhao ◽  
Shao Chang Hao ◽  
Chang Sheng Deng
Keyword(s):  
Room Temperature ◽  
Ph Value ◽  
Internal Gelation ◽  
Uniform Size ◽  
Effect Of Ph ◽  
Gelation Process ◽  
The Stability

The internal gelation process was used to produce gel microspheres containing Zr. The effect of the broth composition particularly pH value on the stability of the broth and morphology of the dried spheres was investigated. The results indicated that the stability of the broth at room temperature increased with the decrease of the pH of the broth. When the pH of the broth was in the range of 1 to 2 the spheres obtained had good sphericity and uniform size and at pH of 1.35 the spheres were transparent.

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