Edelweiss Chemical Science Journal最新文献_第2页

Environmental Chemistry Lectures Based on System Thinking for University Students 基于系统思维的大学生环境化学讲座

Edelweiss Chemical Science Journal Pub Date : 2019-06-04 DOI: 10.33805/2641-7383.109

K. Mizuno, T. Akitsu

引用次数: 0

Magnetic Field Effects on Aqueous Anionic and Cationic Surfactant Solutions Part II: Surface Tension 磁场对阴离子和阳离子表面活性剂水溶液的影响。第二部分:表面张力

Edelweiss Chemical Science Journal Pub Date : 2019-05-20 DOI: 10.33805/2641-7383.107

E. Chibowski, A. Szcześ, L. Hołysz

{"title":"Magnetic Field Effects on Aqueous Anionic and Cationic Surfactant Solutions Part II: Surface Tension","authors":"E. Chibowski, A. Szcześ, L. Hołysz","doi":"10.33805/2641-7383.107","DOIUrl":"https://doi.org/10.33805/2641-7383.107","url":null,"abstract":"Magnetic Field (MF) effects on water and dispersed systems have been studied for more than half of century. However, so far there is no complete understanding of the observed changes in the properties of studied systems if it is solely based on the classical theories of magnetic field action. In Part I of this paper we presented results of MF influence on the evaporation rate of aqueous solutions of anionic surfactant Sodium Dodecyl Sulphate (SDS) and cationic one Dodecyl Trimethylammonium Bromide (DoTAB). In this paper static magnetic field effects on the surface tension of the above-mentioned surfactants are presented. The concentrations of the solutions used were both below and above their Critical Micelle Concentration (CMC). The solutions were under the MF action for 60 min in a closed vessel and were stirred by hand every 15 min. Previously it was found that the surface tension of pure water (distilled in a quartz apparatus) decreased by 2.1 mN/m after similar the MF treatment. Moreover, the memory effect lasted longer than 60 min. \u0000In case of the surfactant solutions the surface tension changed depending both on the kind of surfactant and its concentration. Bigger changes were observed for cationic DoTAB. In the solutions below their CMC the surface tension was lower after MF treatment. However, the surface tension of DoTAB solution at CMC increased several mN/m after the MF treatment. In the solutions concentrated above the CMC, respectively, the MF effects were practically vanishing. The observed changes are discussed in detail considering the structure of the surfactant adsorbed layers and acceleration force acting on the ions which was calculated from the Lorentz equation. To our knowledge, such results are published in the literature for the first time and they should be considered as preliminary ones. More systematic experiments are needed to better understand the observed changes.","PeriodicalId":11477,"journal":{"name":"Edelweiss Chemical Science Journal","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74287887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Magnetic Field Effects on Aqueous Anionic and Cationic Surfactant Solutions Part I: Water Evaporation 磁场对阴离子和阳离子表面活性剂水溶液的影响。第一部分:水蒸发

Edelweiss Chemical Science Journal Pub Date : 2019-05-20 DOI: 10.33805/2641-7383.108

E. Chibowski, A. Szcześ

{"title":"Magnetic Field Effects on Aqueous Anionic and Cationic Surfactant Solutions Part I: Water Evaporation","authors":"E. Chibowski, A. Szcześ","doi":"10.33805/2641-7383.108","DOIUrl":"https://doi.org/10.33805/2641-7383.108","url":null,"abstract":"Static magnetic field (0.5 T) effects on water evaporation rate from anionic Sodium Dodecyl Sulfate (SDS) and cationic Dodecyl Trimethyl ammonium Bromide (DoTAB) 1 mM solutions were studied at room temperature and humidity for up to several hours. Keeping in mind possible practical application of the effects the experiments were intentionally carried out in a common laboratory environment and not in any sophisticated conditions. The evaporation of water from Magnetic Field (MF) treated and untreated samples were carried out simultaneously in the same environment. Although the quantitative differences in the evaporated amounts of water between MF treated and untreated samples changed from run to run, the qualitative MF effects were always reproducible. Therefore, it is believed that the observed changes are significant. It was found that the MF affects evaporation rate of water from solutions of both surfactants causing increase in the evaporated water amount in comparison to that of MF untreated sample. Prior to MF experiments first the water evaporation rate from the untreated surfactants solutions was studied. From the MF-untreated anionic surfactant solution water evaporated slower than from pure water, while from the cationic one water evaporated faster than from pure water. This difference was explained taking into account the properties of the polar (ionic) head of the surfactants, i.e. their size, ability to hydrogen bonding formation with water molecules, and the reduction of water surface tension. The MF treatment caused an increase in the evaporated water amount from both surfactants. However, a greater effect was observed for cationic DoTAB. Because the hydrocarbon tail in both surfactants is the same (C12) the observed differences were assigned to the differences in their ionic heads. Gibbs adsorption equation and Lorentz force in the gradient MF were applied to explain the differences.","PeriodicalId":11477,"journal":{"name":"Edelweiss Chemical Science Journal","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89959732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Appealing Copper(I) and Silver(I) Coordination Polymers with an Unprecedented Betainoid Assembling Ligand 引人注目的铜(I)和银(I)配位聚合物与前所未有的类甜菜碱组装配体

Edelweiss Chemical Science Journal Pub Date : 2019-01-10 DOI: 10.33805/2641-7383.106

Dylan Amelot, Ammar Hassoun, L. Chamoreau, H. Amouri, Jamal Moussa

引用次数: 0

Aluminium Silicon Hypereutectic Alloys from 6063 Alloy’s Black Dross Using Silicon Lumps and Flux 用硅块和助熔剂从6063合金黑渣中提取铝硅过共晶合金

Edelweiss Chemical Science Journal Pub Date : 2018-12-18 DOI: 10.33805/2641-7383.105

Ahmed S. Aadli

{"title":"Aluminium Silicon Hypereutectic Alloys from 6063 Alloy’s Black Dross Using Silicon Lumps and Flux","authors":"Ahmed S. Aadli","doi":"10.33805/2641-7383.105","DOIUrl":"https://doi.org/10.33805/2641-7383.105","url":null,"abstract":"The study on the extraction of Aluminium metal from industrial waste like aluminium dross (black dross) to be used in the production of aluminium silicon hypereutectic alloy and testing the resulted hypereutectic alloy chemically, physically, and mechanically has been carried out. The amount of the black dross used undergoes pretreatment by immersion the dross samples in tap water and settled overnight to assure the maximum separation of nonmetallic, aluminium nitride, aluminium carbide and aluminium oxide, the properties of tap water used for pretreatment dross samples was recorded to see the effect of dross content on the tap water. The pretreated dross samples were dried in electric furnace at 60ₒc for 2hrs then samples of 60 gm remelted in a graphite crucible and amount of flux(sodium chloride, potassium chloride, cryolite and calcium fluoride) (1:1) is added, then different quantities of silicon lumps are added too. The graphite crucible is put in the carbolite furnace at 800ₒc for 30 minutes. The molten aluminium silicon is poured in specific moulds for the chemical and physical examination, which shows the formation of aluminium silicon hypereutectic alloys with good chemical, physical and mechanical properties. Thus the dross is a great source for both aluminium metal high grade and aluminium silicon hypereutectic alloy.","PeriodicalId":11477,"journal":{"name":"Edelweiss Chemical Science Journal","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85875422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Trade-Off in Fire-Retardant Solar Cell Materials and Environmental Issues 阻燃太阳能电池材料与环境问题的权衡

Edelweiss Chemical Science Journal Pub Date : 2018-11-09 DOI: 10.33805/2641-7383.101

T. Akitsu, K. Mizuno

引用次数: 1

Essential Stuffs for the Cause of Metallic Corrosion in Mineral Oils 矿物油中金属腐蚀原因的基本物质

Edelweiss Chemical Science Journal Pub Date : 2018-11-09 DOI: 10.33805/2641-7383.103

S. Aluvihara, J. Premachandra

引用次数: 0

Spectrofluorimetric Study on Inclusion Interaction of β- Cyclodextrin with Bimatoprost: Challenging to Green Analytical Applications β-环糊精与比马前列素包合作用的荧光光谱研究:对绿色分析应用的挑战

Edelweiss Chemical Science Journal Pub Date : 2018-11-07 DOI: 10.33805/2641-7383.102

M. I. Walash, S. Toubar, Maha M AbouEl-Alamin, Maha A Elabd, N. N. Salama

{"title":"Spectrofluorimetric Study on Inclusion Interaction of β- Cyclodextrin with Bimatoprost: Challenging to Green Analytical Applications","authors":"M. I. Walash, S. Toubar, Maha M AbouEl-Alamin, Maha A Elabd, N. N. Salama","doi":"10.33805/2641-7383.102","DOIUrl":"https://doi.org/10.33805/2641-7383.102","url":null,"abstract":"Fluorescence study on inclusion interaction of bimatoprost in absence and presence of β-cyclodextrin shows significant increase in native fluorescence of bimatoprost in the presence of β-cyclodextrin. Fluorescence spectroscopy of host-guest interaction between bimatoprost and β-cyclodextrin shows formation of inclusion complex with 1:1 stoichiometric ratio. The changes of native fluorescence of bimatoprost on inclusion in the hydrophobic β-cyclodextrin cavity is used to calculate the association constant.The fluorimetric method was used for determination of bimatoprost in absence and presence of 1% (w/v) β-cyclodextrin. The studied drug shows native fluorescence at λem 285 after excitation at λex 217 nm in water. The quantum yield [QY] was calculated in absence and presence of β-CD and it was found to be increased from 0.26 to 0.31. The different experimental parameters affecting the fluorescence of the drug was carefully studied and optimized. Linearity was over the range of 25 – 250 ng/mL and 5 – 50 ng/mL in absence and presence of β-CD, respectively with detection limits of 0.05 and 0.006 ng/mL, and quantitation limits of 0.18, and 0.02 ng/mL in absence and presence of β-CD, respectively. The proposed methods were validated as per ICH guidelines, and were effectively applied to analysis of studied drug in its ophthalmic formulation. The results obtained were statistically compared with the reported method revealing high accuracy and good precision. The proposed methods are challenging to green. Qualitative and quantitative metrics revealed excellent eco-friendly fluorimetric method for application in QC laboratories.","PeriodicalId":11477,"journal":{"name":"Edelweiss Chemical Science Journal","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84986782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flaw in Crooks Fluctuation Theorem 克鲁克斯涨落定理中的缺陷

Edelweiss Chemical Science Journal Pub Date : 2018-09-01 DOI: 10.33805/2641-7383.104

Gokaran Shukla

引用次数: 0