Surface Technology最新文献_第7页

Effect of calcination and/or incorporation of trivalent metal ions on the physicochemical properties of nickel oxide catalyst 煅烧和/或加入三价金属离子对氧化镍催化剂理化性质的影响

Surface Technology Pub Date : 1985-07-01 DOI: 10.1016/0376-4583(85)90142-6

M.I. Zaki, S.A.A. Mansour, R.B. Fahim

引用次数: 6

Features of fracture faces in synroc C 同步型C型骨折面特征

Surface Technology Pub Date : 1985-07-01 DOI: 10.1016/0376-4583(85)90140-2

S. Myhra , H.E. Bishop, J.C. Rivière

引用次数: 2

Heats of immersion related to the extent of water loss and specific surface area: CoCl2- and NiCl2-loaded aluminas as dessicant materials 与失水程度和比表面积有关的浸入热:CoCl2和nicl2负载的氧化铝作为干燥剂材料

Surface Technology Pub Date : 1985-07-01 DOI: 10.1016/0376-4583(85)90141-4

A.M. Khalil

{"title":"Heats of immersion related to the extent of water loss and specific surface area: CoCl2- and NiCl2-loaded aluminas as dessicant materials","authors":"A.M. Khalil","doi":"10.1016/0376-4583(85)90141-4","DOIUrl":"https://doi.org/10.1016/0376-4583(85)90141-4","url":null,"abstract":"<div>CoCl2- and NiCl2- loaded aluminas were thermally dehrdrated in vacuo at various temperatures ranging from 20 to 500 °C. The water loss, nitrogen surface area and integral heat of water immersion were determined for the thermally treated samples. The samples inder investigation were analysed using several methods. Changes in porosity were detected by means of the Va-t method. The corrected modelless method was used to determine the surface locations, and the area fraction located in the mesopores was also calculated. This fraction denotes the surface accessibility of various samples for nitrogen adsorbate molecules as well as for the smaller water molecules.Both the integral heat of immersion and the water loss were normalized to the unit nitrogen Brunauer-Emmett-Teller surface area. The correspondence between the changes in the heat of immersion per unit area and the water loss per unit area when they are plotted as functions of the heat treatment temperature indicated that a reversible dehydration-hydration phenomenon occured at high treatment temperatures.Since samples which have the highest surface accessibility for water molecules and are characterized by a relatively high heat of immersion can be assumed to be effective dehydrating materials, it can be concluded from our results that CoCl2-loaded alumina should be heat treated at 400 °C to obtain optimum dessicant properties. However, the NiCl2-loaded alumina requires heat treatment at 200 °C. Further details are presented and discussed.</div>","PeriodicalId":22037,"journal":{"name":"Surface Technology","volume":"25 3","pages":"Pages 273-286"},"PeriodicalIF":0.0,"publicationDate":"1985-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0376-4583(85)90141-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136516084","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

The reduction of surface oxides and carbon during discharge cleaning in tokamaks: Some kinetic-mechanistic aspects 托卡马克放电清洗过程中表面氧化物和碳的还原:一些动力学-机理方面

Surface Technology Pub Date : 1985-06-01 DOI: 10.1016/0376-4583(85)90031-7

K. Dimoff, Ashok K. Vijh

{"title":"The reduction of surface oxides and carbon during discharge cleaning in tokamaks: Some kinetic-mechanistic aspects","authors":"K. Dimoff, Ashok K. Vijh","doi":"10.1016/0376-4583(85)90031-7","DOIUrl":"10.1016/0376-4583(85)90031-7","url":null,"abstract":"<div>Reduction by hydrogen of the residual oxide and carbon present on the inner wall of the tokamak type of nuclear fusion test reactor is found to be an efficient method of ensuring test conditions relatively free from such impurities. The inner wall, which is usually made of stainless steel or Inconel, is exposed to a low pressure electrical discharge through molecular hydrogen within the tokamak vessel which provides the atomic hydrogen necessary for the reduction process. As this discharge cleaning proceeds, the surface oxide and carbon are reduced, with the consequent emission of H2O, CH4 and CO as “impurities” from the walls into the chamber.The analysis of these “impurity” gases during discharge cleaning indicates emission of wall impurity reduction products to be driven by a diffusion-controlled physical process. Evidence for this comes in part from the time-variation characteristics of emission products where a classical t-<math><mtext>1</mtext><mtext>2</mtext></math> dependence is found. Comparatively low values of the activation energy for oxide reduction (5.8 kcal mol-1 or less) confirm this mechanism as the rate-determining step and can be shown to support the same mechanism even in situations where the impurity-time characteristics differ from the classical case. An oxide reduction sequence is presented which is consistent with the kinetic parameters derived from data on discharge cleaning. Kinetic similarities are also shown between the discharge cleaning process in tokamaks and the reduction of iron oxides by hydrogen at high temperature.Interesting surface problems in this field are focused on by a brief review of representative discharge cleaning data, followed by an analysis and interpretation that approaches the problem from a kinetic-mechanistic viewpoint.</div>","PeriodicalId":22037,"journal":{"name":"Surface Technology","volume":"25 2","pages":"Pages 175-193"},"PeriodicalIF":0.0,"publicationDate":"1985-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0376-4583(85)90031-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74230717","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: 6

Distribution coefficient measurement, elution behaviour and column separation of some cationic dyes on chemically pretreated stannic oxide 几种阳离子染料在化学预处理氧化锡上的分布系数测定、洗脱行为及柱分离

Surface Technology Pub Date : 1985-06-01 DOI: 10.1016/0376-4583(85)90028-7

Sadhna Gupta, J.S. Tiwari, G.L. Mundhara

引用次数: 1

Copper deposition overvoltage on non-renewed and continuously mechanically renewed copper electrode surfaces in the Tafel potential region 未更新和连续机械更新的铜电极表面在塔菲尔电位区域的铜沉积过电压

Surface Technology Pub Date : 1985-06-01 DOI: 10.1016/0376-4583(85)90025-1

C.I. Noninski, L.P. Veleva, V.C. Noninski

引用次数: 2

Electron microscope investigations of silver electrodeposition on a (111) silver single crystal 银电沉积在(111)银单晶上的电子显微镜研究

Surface Technology Pub Date : 1985-06-01 DOI: 10.1016/0376-4583(85)90024-X

M.G. Abd El Wahed, H.A. El-Sayed

引用次数: 1

Heats of immersion related to the extent of water loss and specific surface areas: SrCl2- and BaCl2-loaded aluminas as desiccant materials 与失水程度和比表面积有关的浸入热:SrCl2和bacl2负载的氧化铝作为干燥剂材料

Surface Technology Pub Date : 1985-06-01 DOI: 10.1016/0376-4583(85)90027-5

A.M. Khalil

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引用次数: 0

Electrodeposition of iron-rich Ni-Fe alloys from sulphate and chloride baths 硫酸盐和氯化物浴中富铁镍铁合金的电沉积

Surface Technology Pub Date : 1985-06-01 DOI: 10.1016/0376-4583(85)90023-8

K. Nakamura, M. Umetani, T. Hayashi

引用次数: 23

A measurement of the coefficient of static friction of human long bones 测量人体长骨的静摩擦系数

Surface Technology Pub Date : 1985-06-01 DOI: 10.1016/0376-4583(85)90030-5

J.S. Shockey, J.A. von Fraunhofer, D. Seligson

引用次数: 33