Philosophical Magazine Part B最新文献_第10页

Influence of hydroxyl end groups on the vibrational properties of polymer and monomer solutions: An attenuated total reflectance Fourier transform infrared absorbance study 羟基端基对聚合物和单体溶液振动特性的影响:衰减全反射傅里叶变换红外吸光度研究

Philosophical Magazine Part B Pub Date : 2002-03-01 DOI: 10.1080/13642810208223129

V. Crupi, D. Majolino, P. Migliardo, V. Venuti

引用次数: 0

Study of the β relaxation in supercooled confined water 过冷承压水中β弛豫的研究

Philosophical Magazine Part B Pub Date : 2002-03-01 DOI: 10.1080/13642810208223139

F. Venturini, P. Gallo, M. Ricci, A. Bizzarri, S. Cannistraro

引用次数: 2

On the structure of thin amorphous carbon films 非晶碳薄膜的结构研究

Philosophical Magazine Part B Pub Date : 2002-03-01 DOI: 10.1080/13642810208223145

P. Ossi, A. Miotello

{"title":"On the structure of thin amorphous carbon films","authors":"P. Ossi, A. Miotello","doi":"10.1080/13642810208223145","DOIUrl":"https://doi.org/10.1080/13642810208223145","url":null,"abstract":"Abstract Diamond-like carbon films have been prepared by KrF excimer pulsed-laser deposition at a wavelength of 248 nm, with power densities ranging from 0.05 to 1.85 GW cm−2, in vacuum and in a nitrogen atmosphere. Structural analysis was performed first by Fourier transform infrared spectroscopy, which shows that the films are hydrogen free and become transparent above a threshold power density. The band features indicate that the structure of the films is disordered. Combined visible and ultraviolet (UV) Raman spectroscopies allowed us to enhance the scattering cross-section from sp3-coordinated carbon with respect to the sp2 signals. In visible Raman spectra the D and G peaks are found; in UV Raman spectra, besides the blue-shifted G peak and the T peak, a further peak, not reported before, at about 1400 cm−2 is evident in spectra from films deposited in vacuum at low fluences. An analysis of the evolution of Raman fitting parameters with increasing deposition power density shows that above a threshold value of about 0.5 GW cm−2 a structural transition occurs in the films deposited in vacuum from mainly disordered graphitic to predominantly amorphous tetrahedrally bonded carbon. The presence of nitrogen during deposition results in relevant modifications of the Raman spectra, associated with changes in the expansion dynamics of the carbon plasma plume.","PeriodicalId":20016,"journal":{"name":"Philosophical Magazine Part B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75616352","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

Water structure and dynamics in a fully hydrated sodium vermiculite clay 全水合蛭石钠粘土的水结构和动力学

Philosophical Magazine Part B Pub Date : 2002-03-01 DOI: 10.1080/13642810208223138

J. Swenson, R. Bergman, D. Bowron, S. Longeville

{"title":"Water structure and dynamics in a fully hydrated sodium vermiculite clay","authors":"J. Swenson, R. Bergman, D. Bowron, S. Longeville","doi":"10.1080/13642810208223138","DOIUrl":"https://doi.org/10.1080/13642810208223138","url":null,"abstract":"Abstract We have investigated the structure and dynamics of confined water in a fully hydrated sodium vermiculite clay by neutron diffraction and neutron spin-echo (NSE) spectroscopy. All measurements were performed with the Q vector parallel to the clay layers. In the case of the diffraction experiments we used both protonated and deuterated water in order to elucidate the interlayer water structure. The structural results support a picture where the intercalated water is generally ‘liquid like’ with only a small degree of orientational ordering of the water molecules relative to the clay surfaces and other water molecules. The intermediate scattering function S(Q, t) measured by NSE can be described by the Kohlrausch-Williams-Watts stretched-exponential function, probably associated with a broad distribution of relaxation times owing to widely different local environments for the water molecules. Some water molecules are strongly interacting with the clay surfaces or the intercalated Na+ ions, whereas the remaining molecules are interacting only with other water molecules. The Q dependence of the average relaxation time is in good agreement with the Gaussian jump-length distribution model for translational diffusion, suggesting that most of the motions on the experimental time scale (3-3000 ps) have a translational character.","PeriodicalId":20016,"journal":{"name":"Philosophical Magazine Part B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88359244","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

Strength and fracture in strong glasses 高强度玻璃的强度和断裂

Philosophical Magazine Part B Pub Date : 2002-03-01 DOI: 10.1080/13642810208223132

P. G. Gabrielli

{"title":"Strength and fracture in strong glasses","authors":"P. G. Gabrielli","doi":"10.1080/13642810208223132","DOIUrl":"https://doi.org/10.1080/13642810208223132","url":null,"abstract":"Abstract The technological relevance of structural glasses has led to increased efforts to resolve structures and to gain insight into the structure-properties relationship that can be exploited for the design of new materials. During the past few years, there have been a large number of computer simulations to model amorphous structures and to study the mechanical properties of glassy systems. Among the mechanical properties the formation and the evolution of cracks greatly change the performance of every material. The traditional approach to brittle fracture is the study of continuum models, where the stress at the crack tip in an ideally brittle material is singular; since breaking individual bonds at the crack tip is of fundamental importance for crack growth in brittle fracture, it is not clear how accurate a continuum description of brittle fracture is. In strong glasses, which are non-equilibrium systems, the properties depend on the cooling rate at which the sample has been quenched; so the structure is not statistically homogeneous and the local strength may differ from the average value; the stress threshold at which one crack starts to propagate is a random variable and depends almost entirely on the extreme-value statistics of the largest defects. Here we try to connect the theoretical strength, the ageing effects on the mechanical properties and the local fracture toughness distribution in this class of materials.","PeriodicalId":20016,"journal":{"name":"Philosophical Magazine Part B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81894647","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

Low-temperature ionic conductivity in AgI: AgPO3 glasses AgI: AgPO3玻璃中的低温离子电导率

Philosophical Magazine Part B Pub Date : 2002-03-01 DOI: 10.1080/13642810208223136

C. Tomasi, P. Mustarelli, Maria Pilar Infante Garcia, A. Magistris, A. Mandanici

引用次数: 1

Slow dynamics of k-mers on a square lattice 方形晶格上k-mers的慢动力学

Philosophical Magazine Part B Pub Date : 2002-03-01 DOI: 10.1080/13642810208223125

C. Fusco, P. Gallo, A. Petri, M. Rovere

引用次数: 1

Jump rotation in a molecular glass former 分子玻璃成型机中的跳跃旋转

Philosophical Magazine Part B Pub Date : 2002-03-01 DOI: 10.1080/13642810208223128

L. Andreozzi, M. Bagnoli, M. Faetti, M. Giordano

引用次数: 2

Layering and relaxation in molecular films of a photosensitive polyacrylate from X-ray reflectivity and in elastic neutron scattering experiments 从x射线反射率和弹性中子散射实验看光敏聚丙烯酸酯分子膜的分层和弛豫

Philosophical Magazine Part B Pub Date : 2002-03-01 DOI: 10.1080/13642810208223141

L. Cristofolini, M. Fontana, O. Konovalov

引用次数: 0

Pump—probe detection of optical nonlinearity in water-in-oil microemulsion 油包水微乳液光学非线性的泵-探针检测

Philosophical Magazine Part B Pub Date : 2002-03-01 DOI: 10.1080/13642810208223133

L. Vicari

引用次数: 24