Discussions of The Faraday Society最新文献_第3页

Interfacial electrochemistry of haematite (α-Fe2O3) 赤铁矿(α-Fe2O3)界面电化学

Discussions of The Faraday Society Pub Date : 1971-01-01 DOI: 10.1039/DF9715200324

A. Breeuwsma, J. Lyklema

引用次数: 152

Factors affecting conduction in polymeric complex TCNQ salts 影响聚合物络合物TCNQ盐传导的因素

Discussions of The Faraday Society Pub Date : 1971-01-01 DOI: 10.1039/DF9715100131

D. Bonniface, M. J. Braithwaite, D. D. Eley, R. G. Evans, R. Pethig, M. Willis

引用次数: 16

Surface reactivity of reduced titanium dioxide 还原二氧化钛的表面反应性

Discussions of The Faraday Society Pub Date : 1971-01-01 DOI: 10.1039/DF9715200140

P. Gravelle, F. Juillet, P. Mériaudeau, S. Teichner

引用次数: 53

Hole mobility in rubrene rubrene中的孔洞迁移率

Discussions of The Faraday Society Pub Date : 1971-01-01 DOI: 10.1039/DF9715100061

W. Williams

引用次数: 9

Electrical and magnetic properties of poly(phenyleneaminochloranils) 聚苯胺氯胺的电、磁性能

Discussions of The Faraday Society Pub Date : 1971-01-01 DOI: 10.1039/DF9715100144

M. Kryszewski, P. Wojciechowski, S. Sapieha

{"title":"Electrical and magnetic properties of poly(phenyleneaminochloranils)","authors":"M. Kryszewski, P. Wojciechowski, S. Sapieha","doi":"10.1039/DF9715100144","DOIUrl":"https://doi.org/10.1039/DF9715100144","url":null,"abstract":"Electrical and magnetic properties of poly(phenyleneaminochloranils, (PPhCh) obtained from different aromatic diamines (donors) and chloranil or quinone (acceptors) have been investigated. For each PPhCh, the current-voltage characteristics at different temperatures were recorded and Ea, σ293 and σ0 values were determined. Some of the (log10I,ƒ(1/T)), curves showed a kink and lead to two Ea values. For high temperatures the compensation law was fulfilled and a single value of the parameters α and β was calculated for all the PPhCh investigated. The characteristic temperature Tc does not correspond to the Tk value, nor do the Ea values correspond to the 1E1 value of the repeating unit. It is probable that the Ea values are modified by trap levels distributed throughout the sample. In support of this view, the dependence of Ea on voltage was investigated, and the trap density for unit energy was found. The magnetic properties, i.e., the susceptibility χ0 related to free carriers, depend on polymer structure. The χ0 values decrease with decrease of donor polarity and increase when the electron affinity of acceptors increases, thus enhancing the electrical conductivity.","PeriodicalId":11262,"journal":{"name":"Discussions of The Faraday Society","volume":"163 1","pages":"144-155"},"PeriodicalIF":0.0,"publicationDate":"1971-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74798278","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

Structure and properties of amorphous silico-aluminas. Part 5.—Nature and properties of silico-alumina surfaces 非晶硅铝的结构与性能。第5部分。-硅-氧化铝表面的性质和性能

Discussions of The Faraday Society Pub Date : 1971-01-01 DOI: 10.1039/DF9715200098

A. Léonard, P. Ratnasamy, F. D. Declerck, J. J. Fripiat

{"title":"Structure and properties of amorphous silico-aluminas. Part 5.—Nature and properties of silico-alumina surfaces","authors":"A. Léonard, P. Ratnasamy, F. D. Declerck, J. J. Fripiat","doi":"10.1039/DF9715200098","DOIUrl":"https://doi.org/10.1039/DF9715200098","url":null,"abstract":"In order to find to what extent the surface properties of amorphous silico-aluminas and aluminas are related to the atomic organization, the radial electron distribution and X-ray fluorescence spectroscopy were used to determine the kind of structure defects. For high-surface area solids (>100m2/g) a noticeable fraction of the cations and oxygen anions are in the first or the two first surface layers so that the averaged structure parameters obtained from these methods integrate the bulk and the surface organization. Assuming that the defects in the bulk and on the surface are comparable, it should be possible to correlate surface properties, such as the acid properties, with the nature of these defects. Moreover, if some quantitative agreements appear between e.g., the total number of defects and the number of surface acid sites of some sorts, the defects concentrations on the surface phase might be related to the total number of defects. The two above assumptions seem to be acceptable. The three main structure defects appear to be (i) the aluminium cations substituting silicon cations in tetrahedral coordination; (ii) aluminium cations in a perturbed tetrahedral arrangement and (iii) silicon in a perturbed tetrahedral arrangement. In these perturbed tetrahedral arrangements, one at least among the four oxygens might be displaced, exposing partially the cations to the outside. In aluminas, defects of type (ii) are the most probable; they are related to the Lewis acidity. In silico-aluminas, throughout the range of composition, 0 0.5, defects of type (iii) could provide a new source of Lewis acidity. These observations are supported by the variations in the catalytic cracking properties. Defects of type (ii) are also probable in the composition range 0.3 0.6. Also infra-red spectroscopic features of adsorbed NH3 seem to confirm these deductions.","PeriodicalId":11262,"journal":{"name":"Discussions of The Faraday Society","volume":"100 1","pages":"98-108"},"PeriodicalIF":0.0,"publicationDate":"1971-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74827946","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: 32

Stability of ferric oxide hydrosols 氧化铁溶胶的稳定性

Discussions of The Faraday Society Pub Date : 1971-01-01 DOI: 10.1039/DF9715200352

F. Dumont, A. Watillon

引用次数: 60

Calculation of the energy band structure and carrier mobilities in crystalline coronene and ovalene 冠烯和卵二烯晶体能带结构和载流子迁移率的计算

Discussions of The Faraday Society Pub Date : 1971-01-01 DOI: 10.1039/DF9715100024

H. Morris, J. Yates

引用次数: 6

Spectroscopic study of the coordination and valence of Fe and Mn ions in and on the surface of aluminas and silicas 氧化铝和二氧化硅表面铁、锰离子配位和价态的光谱研究

Discussions of The Faraday Society Pub Date : 1971-01-01 DOI: 10.1039/DF9715200121

G. T. Pott, B. D. Mcnicol

{"title":"Spectroscopic study of the coordination and valence of Fe and Mn ions in and on the surface of aluminas and silicas","authors":"G. T. Pott, B. D. Mcnicol","doi":"10.1039/DF9715200121","DOIUrl":"https://doi.org/10.1039/DF9715200121","url":null,"abstract":"A comparative study of the first-row transition metal ions Fe3+ and Mn2+ on the surfaces of aluminas and silicas has been made using the conventional techniques e.s.r., X-ray diffraction, magnetic susceptibility and in addition a relatively new technique phosphorescence spectroscopy.The results indicate that Fe3+ ions dissolve readily in γ-alumina up to 1 w% in samples calcined at 200°C and up to at least 10 % in samples calcined at 800°C. In silica not more than 0.1 w% Fe3+ could be dissolved, the remainder crystallizing as α-Fe2O3 on the surface. E.s.r. and phosphorescence indicate that Fe3+ ions on γ-Al2O3 calcined below 400°C are mostly octahedrally coordinated on the surface, but above this temperature the majority of the Fe3+ ions take up tetrahedral coordination. Mn2+ ions almost exclusively occupy tetrahedral holes at the surface. At the phase transition θ→α-Al2O3 above 1000°C, Fe3+ ions move into trigonally distorted octahedral sites whereas Mn2+ changes valence to Mn4+ in octahedral sites. Also in silica, Fe3+ ions preferentially take up tetrahedral coordination above 400°C heat treatments and remain in these sites up to 1200°C calcination temperatures.Most of these results can be explained on the basis of the differences between the structures of silicas and aluminas.","PeriodicalId":11262,"journal":{"name":"Discussions of The Faraday Society","volume":"1 1","pages":"121-131"},"PeriodicalIF":0.0,"publicationDate":"1971-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88746389","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: 61

The effect of the geometrical structure and the chemistry of oxide surfaces on their adsorption properties 氧化表面的几何结构和化学性质对其吸附性能的影响

Discussions of The Faraday Society Pub Date : 1971-01-01 DOI: 10.1039/DF9715200014

A. V. Kiselev

引用次数: 54