Static wetting angles of water and sulphur at the zinc sulphide surface modified with anionic surfactants and their combinations

2021 ◽  
pp. 29-34
Author(s):  
E. B. Kolmachikhina ◽  
T. N. Lugovitskaya ◽  
K. D. Naumov
Keyword(s):  
Sodium Dodecyl ◽  
Zinc Sulphide ◽  
Wetting Angle ◽  
Elemental Sulphur ◽  
Work Of Adhesion ◽  
Pressure Leaching ◽  
Russian Science ◽  
Pure Zinc ◽  
Wetting Ability ◽  
Surface Modified

This paper looks at the effect produced by surface modification of the super pure zinc sulphide monocrystals with certain surfactants and their combinations (sodium lignosulphonate (SLS), sodium dodecyl sulphate (SDS), sodium dodecylbenzenesulphonate (SDBS) and the following combinations: SLS + SDS, SLS + SDBS on the surface angle of wetting with water and elemental sulphur melt. It was found that as the concentration of individual surfactants in the solution rose, so did the wetting ability of the mineral surface. Thus, at the surfactant concentration of 0.8 g/dm3 the water wetting angle reaches 48.4o for SLS, 22.5o for SDS and 10.3o for SDBS; the elemental sulphur wetting angle is 71.3o for SLS, 76.9o for SDS and 67.9o for SDBS. The work of adhesion in the system ZnS – Surfactant – Н2О increases by 9–11%, and in the system ZnS – Surfactant – S0 — by 5–8%. When using the combinations SLS + SDS (СSLS = 0.2–0.8 g/dm3) and SLS + SDBS (СSLS = 0.2 g/dm3), inverse surface wetting of zinc sulphide with elemental sulphur melt is observed. The maximum wetting angles reached are 93o and 85o, correspondingly. The work of adhesion and the spreading coefficient expectedly decrease. The paper analyzes the effect of individual surfactants and their combinations on the pressure leaching of zinc sulphide concentrate. The use of individual surfactants intensifies the transition of valuable components into the solution. The biggest increase in recovery was seen when using SLS, and namely 27–32% for zinc and 11–16% for copper. The recovery of zinc increased by 31–41% in the presence of SLS + SDS and by 27–34% in the presence of SLS + SDBS. This research was funded by the Russian Science Foundation, Grant No. 18-19-00186.

Surface-modified halloysite nanotubes as fillers applied in reinforcing the performance of polytetrafluoroethylene

Clay Minerals ◽  
2018 ◽  
Vol 53 (4) ◽  
pp. 643-656 ◽  
Author(s):  
Zhi-Lin Cheng ◽  
Xing-Yu Chang ◽  
Zan Liu ◽  
Dun-Zhong Qin
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Sodium Dodecyl ◽  
Halloysite Nanotubes ◽  
Angle Measurements ◽  
Transmission Electron ◽  
Contact Angle Measurements ◽  
Ftir Spectrometry ◽  
Surface Modified ◽  
Scanning Electron

ABSTRACTIn order to improve the dispersibility of halloysite nanotubes (HNTs) in polytetrafluoroethylene (PTFE), the modification of HNT surfaces was studied with three types of modifiers (polymethyl methacrylate [PMMA], sodium dodecyl sulfate [SDS] and carboxylic acid). The modified HNTs were characterized by Fourier-transform infrared (FTIR) spectrometry, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and contact angle measurements. The HNTs were used to reinforce the mechanical properties of PTFE. The mechanical results indicated that the tensile strength of the modified HNT-filled PTFE nanocomposites (F-HNT/PTFE) improved to an acceptable degree and Young's modulus increased significantly. The tribological results showed that the wear rate of F-HNT/PTFE decreased by 21–82 and 9–40 times compared to pure PTFE and the pristine F-HNT/PTFE, respectively.

Synthesis and Characterization of Pure and Mn Doped Zinc Sulphide Nanoparticles and Nanofluids

2015 ◽  
Vol 1086 ◽  
pp. 101-106
Author(s):  
M. Gopalakrishnan ◽  
Issac P. Nelson ◽  
Solomon Jeevaraj A. Kingson
Keyword(s):  
Morphological Structure ◽  
Blue Shift ◽  
Chemical Precipitation ◽  
Zinc Sulphide ◽  
Precipitation Method ◽  
Average Particle ◽  
Zns Nanoparticles ◽  
Pure Zinc ◽  
Yellow Orange ◽  
Mn Doped

In this work, pure ZnS and Mn doped ZnS nanoparticles are synthesized by simple chemical precipitation method. The structure of pure zinc sulphide and Mn doped zinc sulphide sample are analyzed by X-ray diffraction technique. The morphological structure of zinc sulphide and Mn2+doped zinc sulphide nanoparticles are studied using scanning electron microscope (SEM). The average particle sizes of pure ZnS nanoparticles are determined to be from 29 nm to 44 nm and Mn doped ZnS nanoparticles are determined to be from 99 nm to 135 nm. The optical properties of pure and Mn doped ZnS nanoparticles have been investigated by photoluminescence (PL) spectroscopy. The emission spectrum of Mn2+doped with ZnS particles of the present study shows blue shift of the yellow-orange emission peak at 590 nm. Nanofluids are prepared for six different concentrations by dispersing pure and Mn2+doped ZnS nanoparticles in de-ionized water. Thermal conductivity studies are carried out for both nanofluid systems and the results are discussed.

scholarly journals Theory of the luminosity produced in certain substances by α-rays

1910 ◽  
Vol 83 (566) ◽  
pp. 561-572 ◽  
Keyword(s):  
Preceding Paper ◽  
Zinc Sulphide ◽  
Water Molecules ◽  
Initial Value ◽  
Solid Matter ◽  
Complex Molecules ◽  
Pure Zinc ◽  
Rate Of Decay ◽  
Constant Source ◽  
Active Centres

In the preceding paper, Mr. Marsden has examined the decay of the luminosity excited by α -rays in zinc sulphide, willemite, and barium platinocyanide, when subjected to an intense bombardment by α -particles. He has shown that the luminosity decreases with continued bombardment to a very small fraction of its initial value. For a given bombardment, the rate of decay of luminosity is about the same for zinc sulphide and willemite, but is especially rapid in barium platinocyanide. The action of the α -particles on phosphorescent zinc sulphide is of special interest and importance on account of the marked scintillations observed, and the fact that each α -particle under suitable conditions produces a visible scintillation. Mr. Marsden has brought out the essential fact that the actual number of scintillations observed for a constant source of α -rays changes very little with continued bombardment, but the brightness of the scintillations rapidly diminishes. It is well known that the α -particles exert a marked dissociation effect in complex molecules on which they fall. For example, the α -rays from radium or its emanation, dissolved in water, dissociate the water molecules, producing hydrogen and oxygen at a rapid rate. I have shown elsewhere (‘Radio-active Transformations,’ p. 253), that the magnitude of this effect is in agreement with the view that each α -particle dissociates as many molecules of water as it produces ions in its path in air. The loss of energy of the α -particle in passing through a gas is mainly used up in producing ions in the gas. The laws of absorption of α -particles, which have been so carefully worked out by Bragg, show that no definite distinction as regards absorption can be drawn between a solid and a gas. It is reasonable to suppose that the α -particle produces ions in a solid as well as in a gas, and that the absorption of the α -particle is due mainly to the energy used up in this process. If the solid matter is composed of complex molecules, the latter will be dissociated by the α -particles. As Marsden has pointed out, pure zinc sulphide does not exhibit the scintillation effect, but this only appears in zinc sulphide to which certain impurities have been added. Since the amount of impurity present is of the order of 1 per cent., it is probable that only a small fraction of the total number of molecules give rise to the scintillation effect. These “active centres,” as they will be called, will on the average be uniformly distributed among the inactive molecules.

Effect of Anionic Surfactant on Adsorption Properties of Nano Calcium Carbonate

2018 ◽  
Vol 281 ◽  
pp. 830-835 ◽  
Author(s):  
Qing Li Ren ◽  
Qiang Luo ◽  
Feng Lei Wang
Keyword(s):  
Calcium Carbonate ◽  
Sodium Dodecyl Sulfate ◽  
High Surface ◽  
Sodium Dodecyl ◽  
Langmuir Model ◽  
Phase Method ◽  
Adsorption Performance ◽  
Dodecyl Sulfate ◽  
Superior Surface ◽  
Surface Modified

Because of its superior surface properties, nanocalcium carbonate can be applied to the adsorption of heavy metals in wastewater. However, because of the easy aggregation of nanocalcium carbonate, high surface energy and poor dispersibility in water, it is not conducive to the process of adsorption. Therefore, surface modification of nanocalcium carbonate is needed. In this paper, nanocalcium carbonate was prepared by liquid phase method. And the nanocalcium carbonate was surface modified by sodium dodecyl sulfate. The effects of modifier amount, modification temperature, and modification time on the activation and absorbance of nanocalcium carbonate were investigated. And the morphology and particle size of modified nanocalcium carbonate were tested by SEM and XRD patterns.The results show that the dispersion and surface activity of the modified nanocalcium carbonate have been improved remarkably. Moreover, the Cu2+ was adsorbed by sodium dodecyl sulfate modified nanocalcium carbonate and unmodified nanocalcium carbonate under the optimum modification conditions. And the effects of nanocalcium carbonate initial concentration on the adsorption performance were studied. The results show that the adsorption performance of modified calcium carbonate is better than that of the unmodified. Moreover, the adsorption process is studied by adsorption isotherm. By drawing the adsorption isotherms lines and by comparing the fitting result of the experimental data based on the Langmuir model and that of Freundlich model, it is found that the adsorption of Cu2+ by modified nanocalcium carbonate meets the Langmuir model.

scholarly journals One Step Synthesis, Characterization of Modified Montmorillonite with Hydrothermal-Assist for Triazolone Sustained Release System with pH Sensitivity

2020 ◽  
Vol 26 (4) ◽  
pp. 451-456
Author(s):  
Hua XU ◽  
Hongkai DENG ◽  
Huayao CHEN ◽  
Hongjun ZHOU ◽  
Xinhua ZHOU ◽  
...  
Keyword(s):  
Sustained Release ◽  
Layer Structure ◽  
Hydrothermal Process ◽  
Sodium Dodecyl ◽  
Amorphous State ◽  
Contact Angles ◽  
Ph Sensitivity ◽  
Release System ◽  
One Step ◽  
Surface Modified

Montmorillonite K-10 clay (MMT) was surface-modified by sodium dodecyl sulfate (SDS) and grafted with KH-550 coupling agent to construct "Hy-MMT" organic modified structure in one step with hydrothermal-assist. Different sustained release systems were prepared through changing the temperature during the hydrothermal process. The characterization results illustrated the mechanism of the hydrothermal assist in intercalation during the organic modification. It was also proved that the triazolone loaded in the sustained release system existed as homogeneous in the pores as amorphous state by DSC analysis. According to SEM and TEM observation, the surface of original MMT or modified MMT without hydrothermal assist presented rough particles, which belonged to the SDS and KH-550 without intercalation into the layer structure which is in accordance with the contact angles of the samples. The experimental results indicated that the adsorption capacity (AC) of Hy-60-MMT showed the best due to its mild react condition the successfully intercalated by SDS and KH-550 by the assist of the hydrothermal treatment. Its AC for triazolone was significantly increased to 29.8 mg/g comparing to MMT without modification which showed no capacity for triazolone adsorption. The as-synthesized system also showed significant pH sensitivity with a sequence of pH = 7 > pH = 3 > pH = 5 > pH = 9 in release speed indicating that the sustained release system can be well stored in mild acid or basic environment and activated while sprayed into earth or plants under neutral condition.

Sodium Lingo-Sulfonate and Sodium Dodecyl-Sulfate Mixtures Influence on Zinc Concentrate Pressure Leaching and Zinc Electro-Winning

2020 ◽  
Vol 299 ◽  
pp. 1121-1127
Author(s):  
E.B. Kolmachikhina ◽  
E.A. Ryzhkova ◽  
D.V. Dmitrieva
Keyword(s):  
High Temperature ◽  
Sodium Dodecyl Sulfate ◽  
Current Efficiency ◽  
Sodium Dodecyl ◽  
Pressure Leaching ◽  
Leaching Tests ◽  
Zinc Extraction ◽  
Zinc Surface ◽  
Dodecyl Sulfate ◽  
Zinc Concentrate

This paper is describing an investigation of sodium lingo-sulfonate and sodium dodecyl-sulfate mixtures influence on zinc concentrates high temperature oxidative pressure leaching and zinc electro-winning. For this purpose, surfactants concentration at leaching tests was varied from 200 to 800 mg∙l-1. It was established that the maximum zinc extraction (99 %) at leaching was achieved in the presence of mixture containing 800 mg∙l-1 lignosulfonate and 200 mg∙l-1 sodium dodecyl-sulfate. Therefore, this mixture can be recommended for high temperature oxidative pressure leaching of zinc concentrates. Sulfur-sulfide pellets formation also was observed at a low lingo-sulfonate concentration (200 mg∙l-1) in a mixture with sodium dodecyl-sulfate. This phenomenon can lead to emergency shut down of autoclave. It was observed that the mixture usage of 800 mg∙l-1 lignosulfonate and 200 mg∙l-1 sodium dodecyl-sulfate had no significant impact on zinc current efficiency, it was in the rage of 92-93 %. The mixture usage of 200 mg∙l-1 lignosulfonate and 600 mg∙l-1 sodium dodecyl-sulfate allowed to increase current efficiency up to 95 %. Increasing sodium dodecyl-sulfate concentration in mixtures with lignosulfonates leads to decrease of current efficiency, to formation of deep pores and defects on cathode zinc surface.

Iron removal during oxidative, acid pressure leaching of a zinc sulphide concentrate

1989 ◽  
Vol 25 (3-4) ◽  
pp. 241-260 ◽  
Author(s):  
Fiona M. Doyle ◽  
Hernando Arauco ◽  
Lucia M. Feng
Keyword(s):  
Zinc Sulphide ◽  
Iron Removal ◽  
Pressure Leaching
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