Surface Technology最新文献_第3页

The standard but misleading nitrogen adsorption isotherm and texture assessment of porous silicas and aluminas 多孔二氧化硅和氧化铝的标准氮吸附等温线和结构评定

Surface Technology Pub Date : 1985-11-01 DOI: 10.1016/0376-4583(85)90122-0

M. Abd-el-khalik, M. Zaki

引用次数: 3

Hydrothermal preparation of goethite crystals 针铁矿晶体的水热制备

Surface Technology Pub Date : 1985-11-01 DOI: 10.1016/0376-4583(85)90124-4

S. Ardizzone, L. Formaro

引用次数: 7

Texture and microstructure of NiO derived from Ni(OH)2 in vacuum Ni(OH)2在真空中制备NiO的织构和显微结构

Surface Technology Pub Date : 1985-11-01 DOI: 10.1016/0376-4583(85)90123-2

J.M. Fernández Rodríguez, J. Morales, J.L. Tirado

引用次数: 1

Surface properties of Ni-Al mixed oxide catalysts 镍铝混合氧化物催化剂的表面性能

Surface Technology Pub Date : 1985-11-01 DOI: 10.1016/0376-4583(85)90120-7

G.A. El-Shobaky, A.N. Al-Noaimi

{"title":"Surface properties of Ni-Al mixed oxide catalysts","authors":"G.A. El-Shobaky, A.N. Al-Noaimi","doi":"10.1016/0376-4583(85)90120-7","DOIUrl":"10.1016/0376-4583(85)90120-7","url":null,"abstract":"<div>A series of Ni-Al mixed oxides having different compositions was prepared by coprecipitation and by impregnation. The solids obtained were heated in air at 450–1000 °C. The surface properties, namely, SBET, St, Vp and <math><mtext>r</mtext></math>, of each adsorbent were determined from nitrogen adsorption isotherms. The change in SBET as a function of calcination temperature permitted the calculation of the apparent energy of activation of sintering.The results obtained revealed that the catalysts prepared by coprecipitation had higher surface areas than those obtained by impregnation. The mixed oxide solids seemed to be composed of wide pores. However, the pores of the adsorbents prepared by impregnation were narrower than those measured for the adsorbents prepared by coprecipitation. Also, the specific surface area depended on the NiO/Al2O3 ratio. The presence of Al2O3 increased the degree of dispersion of NiO grains leading to a significant increase in its surface area, with effective retardation of sintering of the NiO phase. The apparent energy Es of activation of sintering indicated that the increase in alumina content was followed by a corresponding increase in the magnitude of Es.</div>","PeriodicalId":22037,"journal":{"name":"Surface Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0376-4583(85)90120-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79918524","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: 18

A review on photoluminescence and electroluminescence of semiconductors for photoelectrochemical cells 光电化学电池中半导体的光致发光和电致发光研究进展

Surface Technology Pub Date : 1985-10-01 DOI: 10.1016/0376-4583(85)90001-9

L.Peraldo Bicelli

引用次数: 9

Effects of γ irradiation and lithium doping on the catalytic activity of nickel-aluminum mixed oxides γ辐照和锂掺杂对镍铝混合氧化物催化活性的影响

Surface Technology Pub Date : 1985-10-01 DOI: 10.1016/0376-4583(85)90003-2

G.A. El-Shobaky, A.N. Al-Noaimi, A.M. Dessouki

{"title":"Effects of γ irradiation and lithium doping on the catalytic activity of nickel-aluminum mixed oxides","authors":"G.A. El-Shobaky, A.N. Al-Noaimi, A.M. Dessouki","doi":"10.1016/0376-4583(85)90003-2","DOIUrl":"10.1016/0376-4583(85)90003-2","url":null,"abstract":"<div>The catalytic activity of pure NiO and Ni-Al mixed oxides subjected to various doses of γ irradiation was investigated using the oxidation of CO with O2 at various temperatures. The effect of lithium doping on the catalytic activity of Ni-Al was also investigated. The results obtained revealed that γ irradiation of pure NiO using doses up to 10 Mrad effected a decrease of 45% in its catalytic activity which suffered a further slight change when the dose was increased to 20 Mrad. The activity of Ni-Al mixed oxide was modified in a somewhat complicated manner by γ irradiation. Doses of 5 – 10 Mrad produced an increase of 34% in its catalytic activity and a dose of 15 Mrad caused a drastic decrease in its activity of 57%. Increasing the dose of 20 Mrad produced a slight increase in the catalytic activity of the mixed oxide solid.The modifications in the catalytic activity of pure NiO and mixed oxide solids arising from γ irradiation were attributed to an induced removal of chemisorbed O2 in the case of pure NiO and to a possible increase in the [Ni]/[Al] ratio, especially in the outermost surface layers, of the mixed oxide catalyst.Lithium doping was found to cause a significant increase in the catalytic activity of Ni-Al mixed oxide which was attributed to the increase in the amount of chemisorbed O2 and to an increase in the [Ni]/[Al] ratio.</div>","PeriodicalId":22037,"journal":{"name":"Surface Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0376-4583(85)90003-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89702228","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: 36

Thermal and spectroscopic measurements of the interactions of oleic acid with surfaces of aluminum, magnesium and Al-Mg alloys 油酸与铝、镁和铝镁合金表面相互作用的热光谱测量

Surface Technology Pub Date : 1985-10-01 DOI: 10.1016/0376-4583(85)90004-4

Robert A. Ross, Rejean Lemay

{"title":"Thermal and spectroscopic measurements of the interactions of oleic acid with surfaces of aluminum, magnesium and Al-Mg alloys","authors":"Robert A. Ross, Rejean Lemay","doi":"10.1016/0376-4583(85)90004-4","DOIUrl":"10.1016/0376-4583(85)90004-4","url":null,"abstract":"<div>Differential scanning calorimetry and Fourier transform IR reflectance spectroscopy have been used to study the interactions of oleic acid with the surfaces of aluminum, magnesium and Al-Mg alloys. Measurements were made in both air and argon from 150 to 575 °C. The magnesium content of the alloys ranged from 2.6 to 10.7 wt.% and samples were examined in the form of fine powders or smooth plates. A few experiments were also conducted using granular magnesium and aluminium oxides to assist in evaluating the role of surface oxides in the reactions. The IR reflectance signals at about 1590 and 1450 cm-1 showed the formation of magnesium oleate in the various magnesium samples at 175 to 300 °C. With the alloy series there was a marked trend towards greater absorbance of these bands with increase in the magnesium content. Little or no evidence was obtained for the formation of aluminum oleate from IR spectra while thermal measurements showed enthalpy changes of -1050 and -650 cal g-1 respectively for magnesium and aluminium grains in reactions with the acid in air over the range from 150 to 575 °C. Supplementary details of the surface properties of samples were obtained from profilometric, nitrogen adsorption and electron spectroscopy for chemical analysis measurements. Some preliminary work is described in which alloys were laminated to high density polyethylene in an attempt to assess the influence of surface composition on joint strengths.</div>","PeriodicalId":22037,"journal":{"name":"Surface Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0376-4583(85)90004-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81270286","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: 4

Dendritic electrocrystallization of lead from lead nitrate solution 硝酸铅溶液中铅的枝晶电结晶

Surface Technology Pub Date : 1985-10-01 DOI: 10.1016/0376-4583(85)90008-1

K.I. Popov, N.V. Krstajić, R.M. Pantelić, S.R. Popov

引用次数: 20

Electrocrystallization of silver from silver nitrate solutions at low overpotentials 低过电位下硝酸银溶液中银的电结晶

Surface Technology Pub Date : 1985-10-01 DOI: 10.1016/0376-4583(85)90009-3

K.I. Popov, N.V. Krstajić, Z.Dj. Jerotijević, S.R. Marinković

引用次数: 10

The IR electromagnetic effect induced in the fine step bands of the (001) face of GaAs(Te) by applying an alternating field 在交变电场作用下，在GaAs(Te)(001)表面的精细步进带中产生了红外电磁效应

Surface Technology Pub Date : 1985-10-01 DOI: 10.1016/0376-4583(85)90005-6

Kenzo Sato

{"title":"The IR electromagnetic effect induced in the fine step bands of the (001) face of GaAs(Te) by applying an alternating field","authors":"Kenzo Sato","doi":"10.1016/0376-4583(85)90005-6","DOIUrl":"10.1016/0376-4583(85)90005-6","url":null,"abstract":"<div>The optical sensitivity of the excess impurity lone-pair electrons is discussed on the basis of the values of the IR reflection integral which were derived from the plasma edge profile of the (001) face of GaAs(Te) for eight levels of dopant concentration. From the analysis of the variation in the reflectivity including annihilation and creation of some fine step bands induced by applying an alternating electromagnetic field with frequency f = A × 10m−1 (m = 1, 2, …, 7) parallel to the <100 > direction, we estimate that this sensitive effect may be induced primarily by the dynamical variation of the matrix elements of these oscillators, the values of which are determined by the dipole moments and oscillator concentrations. By using the Nf-R relations of the fine step bands measurable at 274 cm-1, 290 cm-1 and 315 cm-1, the degree of variation in the effective oscillator concentration and the effective charge are estimated and reasonable values are obtained, by comparison with the Born effective charge the dipole-moments were determined. The step property of the nine fine step bands superimposed on the fundmental lattice band and the plasma edge is analysed for the two types of sample.</div>","PeriodicalId":22037,"journal":{"name":"Surface Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0376-4583(85)90005-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84743740","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