Special Discussions of The Faraday Society最新文献

Boundary viscosity of polydimethylsiloxane liquids and their binary mixtures 聚二甲基硅氧烷液体及其二元混合物的边界粘度

Special Discussions of The Faraday Society Pub Date : 1992-05-01 DOI: 10.1039/SD9700100098

B. V. Deryaguin, V. Karasev, I. Lavygin, I. I. Skorokhodov, E. N. Khromova

{"title":"Boundary viscosity of polydimethylsiloxane liquids and their binary mixtures","authors":"B. V. Deryaguin, V. Karasev, I. Lavygin, I. I. Skorokhodov, E. N. Khromova","doi":"10.1039/SD9700100098","DOIUrl":"https://doi.org/10.1039/SD9700100098","url":null,"abstract":"A systematic study is made of the boundary viscosity of a number of polydimethylsiloxane liquids (PMS) of molecular weights ranging from 1,000 to 40,000 by the blow-off method, film thicknesses being measured by a modulation-polarimetric (elliposmetric) precedure. It is established experimentally that the viscosity of the liquids studied is not the same throughout the thickness of the boundary later.PMS applied to glass and steel substrates retain their bulk viscosity values down to a layer thickness of ca. 150–200 A, below which the viscosity increases slightly. On further decrease of the distance to 10–15 A from the substrate, the viscosity becomes anomalously low, amounting to about 10–20 % of the bulk value. The existence of a layer of anomalously low viscosity may be attributed to orientation of the PMS molecules in the plane of the substrate, and hence, to the ease with which these oriented layers slip relative to one another.When studying the boundary viscosity of binary mixtures of PMS of different molecular weights, boundary phases of elevated viscosity were found to exist at a distance of 15–30 A from the substrate. This phenomenon may be attributed to a change in concentration of the mixture at the solid surface i.e., to an increase in content of the component with the higher molecular weight in the wall-adjacent layer.","PeriodicalId":341426,"journal":{"name":"Special Discussions of The Faraday Society","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123916195","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: 21

Thermodynamic properties of thin films of some dipolar liquids adjacent to fused silica surfaces 某些偶极液体与熔融二氧化硅表面相邻的薄膜的热力学性质

Special Discussions of The Faraday Society Pub Date : 1900-01-01 DOI: 10.1039/SD9700100089

K. H. Adlfinger, G. Peschel

引用次数: 14

Boundary layer near the surface of a solid body and low-frequency dielectric dispersion 靠近固体表面的边界层和低频介电色散

Special Discussions of The Faraday Society Pub Date : 1900-01-01 DOI: 10.1039/SD9700100158

S. Dukhin

引用次数: 5

Interaction energy of emulsion droplets and the influence of adsorbed layers on it 乳状液滴的相互作用能及吸附层对其的影响

Special Discussions of The Faraday Society Pub Date : 1900-01-01 DOI: 10.1039/SD9700100057

H. Sonntag, J. Netzel, B. Unterberger

引用次数: 9

Nuclear magnetic resonance studies of water in disperse systems 分散体系中水的核磁共振研究

Special Discussions of The Faraday Society Pub Date : 1900-01-01 DOI: 10.1039/SD9700100175

J. Clifford, J. Oakes, G. Tiddy

引用次数: 11

Interlayer water in vermiculite: thermodynamic properties, packing density, nuclear pulse resonance, and infra-red absorption 蛭石层间水:热力学性质、堆积密度、核脉冲共振和红外吸收

Special Discussions of The Faraday Society Pub Date : 1900-01-01 DOI: 10.1039/SD9700100187

J. Hougardy, J. Serratosa, W. Stone, H. Olphen

{"title":"Interlayer water in vermiculite: thermodynamic properties, packing density, nuclear pulse resonance, and infra-red absorption","authors":"J. Hougardy, J. Serratosa, W. Stone, H. Olphen","doi":"10.1039/SD9700100187","DOIUrl":"https://doi.org/10.1039/SD9700100187","url":null,"abstract":"Water vapour sorption isotherms on sodium and magnesium vermiculite of high charge density were measured at 25 and 50°C. Heats of immersion at various stages of hydration were measured at 25°C. According to X-ray observations during the sorption process, two discrete interlayer hydrates are obtained with one and two monolayers of water between the unit layers of the crystallites. The derived integral entropy of adsorption indicates a reduced freedom of motion of the interlayer water molecules compared with that for water molecules in the liquid state. Comparison of the apparent density of the hydrated clay with the calculated crystallographic density indicates that interlayer water is slightly more densily packed than liquid water. However, the bulk density of water in a sodium vermiculite suspension is normal for the water in excess of the two hydration layers.Nuclear pulse resonance results obtained on sodium vermiculite shows that water in the one-layer hydrate is organized and some hypotheses are presented regarding this organization. Water molecules in the two-layer complex show the same degree of orientation only below –65°C. Infra-red absorption spectra for hydrated flakes of sodium vermiculite were obtained as a function of angle between the (001) plane of the crystallites and the i.-r. beam. The results indicate orientation of water molecules in the one-layer hydrate at room temperature.","PeriodicalId":341426,"journal":{"name":"Special Discussions of The Faraday Society","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128843952","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: 19

Measurement of viscosity of liquids in quartz capillaries 石英毛细管中液体粘度的测量

Special Discussions of The Faraday Society Pub Date : 1900-01-01 DOI: 10.1039/SD9700100213

N. V. Churayev, V. Sobolev, Z. Zorin

引用次数: 34

Composition and energy relationships for some thin lipid films, and the chain conformation in monolayers at liquid-liquid interfaces 一些脂质薄膜的组成和能量关系，以及液-液界面单层的链构象

Special Discussions of The Faraday Society Pub Date : 1900-01-01 DOI: 10.1039/SD9700100046

D. M. Andrews, E. Manev, D. Haydon

{"title":"Composition and energy relationships for some thin lipid films, and the chain conformation in monolayers at liquid-liquid interfaces","authors":"D. M. Andrews, E. Manev, D. Haydon","doi":"10.1039/SD9700100046","DOIUrl":"https://doi.org/10.1039/SD9700100046","url":null,"abstract":"Optically black films have been formed in aqueous media from solutions of glyceryl mono-oleate in aliphatic hydrocarbons. The thicknesses of the hydrocarbon cores of the films were estimated from electrical capacitance measurements and the compositions from interfacial tension data. The thicknesses and the compositions were found to be interrelated in a simple way and were markedly dependent on the chain length of the hydrocarbon solvent.An electrical potential applied across a liquid film subjects it to a large compressive force under which most types of film became significantly thinner. From thickness measurements in applied fields the strengths of the steric interactions which stabilize the films were calculated. From a knowledge of the steric interaction, together with an estimate of the London-van der Waals forces from contact angle measurements, the curve of potential energy against film thickness has been calculated for one system. The magnitude of the steric interaction at a given film thickness varies considerably for films of different solvent content. As a consequence, a general picture of the time-average conformations of the hydrocarbon chains of glyceryl mono-oleate in the black films and at different hydrocarbon/water interfaces may be deduced.","PeriodicalId":341426,"journal":{"name":"Special Discussions of The Faraday Society","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114589028","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: 98

Neutron scattering studies of hydrated layer silicates 水合层硅酸盐的中子散射研究

Special Discussions of The Faraday Society Pub Date : 1900-01-01 DOI: 10.1039/SD9700100194

S. Olejnik, G. Stirling, J. White

引用次数: 20

Cohesive properties of thin films of liquids adhering to a solid surface 液体薄膜附着在固体表面上的粘合特性

Special Discussions of The Faraday Society Pub Date : 1900-01-01 DOI: 10.1039/SD9700100064

J. F. Padday

引用次数: 63