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Neutron Scattering Study Of The Dynamics Of Short Chain Hydrocarbon Films And The Structure And Phase Transitions Of Iron Pentacarbonyl Films Adsorbed On Graphite
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Book Synopsis Neutron Scattering Study of the Dynamics of Short-chain Hydrocarbon Films and the Structure and Phase Transitions of Iron Pentacarbonyl Films Adsorbed on Graphite by : Reynold W. Wang
Download or read book Neutron Scattering Study of the Dynamics of Short-chain Hydrocarbon Films and the Structure and Phase Transitions of Iron Pentacarbonyl Films Adsorbed on Graphite written by Reynold W. Wang and published by . This book was released on 1983 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis American Doctoral Dissertations by :
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1983 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Diffraction and Quasielastic Neutron Scattering Studies of Films of N-alkanes and a Branched Alkane Absorbed on Graphite by : Leah Criswell
Download or read book Neutron Diffraction and Quasielastic Neutron Scattering Studies of Films of N-alkanes and a Branched Alkane Absorbed on Graphite written by Leah Criswell and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Alkane molecules are important as constituents of lubricants, fuels, and polymers. Often these applications, such as lubrication, involve molecularly thin films of alkanes. We have studied the structures of n-tetracosane (n-C24D50) and squalane (C30H62) adsorbed on graphite below room temperature using neutron diffraction. We find that both the n-tetracosane and the squalane monolayers undergo a phase transition from a more-ordered crystalline phase to a less-ordered "smectic" phase on heating. Quasielastic neutron scattering studies of multiple layers of n-heptane (n-C--D16) above a crystalline n-dotriacontane (n-C32D66) monolayer adsorbed on graphite reveal that two dynamical layers can be distinguished. The first is composed of the first heptane layer which exhibits slower motions. The second is composed of the additional layers above this monolayer, which exhibit faster diffusion comparable to that of bulk. We also studied a monolayer of n-tetracosane adsorbed on graphite by quasielastic neutron scattering. We found that a slower diffusion motion became activated at 330 K, where molecular dynamics simulations indicate most molecular motions become too fast for observation. Instead, these simulations indicate that intramolecular and rotational diffusion of more globularly shaped n-tetracosane molecules, which contain many gauche defects, is being observed at this temperature.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1984 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Scattering Investigations of the Dynamics of Thin Films Adsorbed on Solid Surfaces by :
Download or read book Neutron Scattering Investigations of the Dynamics of Thin Films Adsorbed on Solid Surfaces written by and published by . This book was released on 1997 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: While not commonly thought of as surface sensitive probes, high-resolution inelastic and quasielastic neutron scattering (INS) techniques can be used to investigate the dynamical properties of films adsorbed on solid surfaces. These studies are possible because the adsorption takes place on samples which exhibit a large surface-to-volume ratio. By combining dynamical measurements with data from structural, thermodynamic and computer simulation studies it is then possible to develop a comprehensive picture of the microscopic properties of an adsorbed film system. In order to illustrate the power of employing INS techniques we will discuss the continuous melting of monolayer ethylene and the layer-by-layer melting of multilayer argon films on the basal plane of graphite and the rotational tunneling of methane films on the MgO(100) surface.
Book Synopsis Neutron and X-ray Scattering Study of Intermediate-length Alkane Films Adsorbed on Solid Surfaces by : Haiding Mo
Download or read book Neutron and X-ray Scattering Study of Intermediate-length Alkane Films Adsorbed on Solid Surfaces written by Haiding Mo and published by . This book was released on 2004 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic thin films grown on solid surfaces are of great importance in applications such as microelectronics, biosensors, lubrication, and coatings. Using neutron diffraction and synchrotron x-ray scattering, we have conducted experiments to study the growth and structure of alkane films on solid surfaces. Our neutron diffraction study of a high-coverage monolayer of tetracosane (an alkane-chain molecule containing 24 carbon atoms) adsorbed on a graphite substrate shows that, near room temperature, the monolayer has a different structure than in a lower coverage monolayer investigated previously. Upon heating, it transforms from a crystalline to a liquid-crystal-like phase. For dotriacontane (an alkane chain molecule containing 32 carbon atoms, denoted C32) films adsorbed on silicon wafers, our x-ray specular reflectivity measurements show a unique structure in that the first one or two layers of molecules are oriented with their long axis parallel to the surface and are followed by a layer of molecules oriented with their long axis perpendicular to the substrate. As more molecules are added onto the substrate, bulk particles having two different structures nucleate on top of the film. For C32 grown on a single-crystal silver surface, x-ray diffraction shows that monolayer and multilayer films have a different crystal structure near room temperature. Specular x-ray reflectivity measurements demonstrate that multilayer films exhibit a layered structure even when they are fluid at high temperatures. At higher coverage, bulk particles nucleate with three different orientations. The structure and growth behavior of alkane films discovered in this research may help design better methods to grow organic crystals for microelectronics devices and to develop better lubricants.
Book Synopsis Neutron Scattering – Fundamentals by : Mark R. Johnson
Download or read book Neutron Scattering – Fundamentals written by Mark R. Johnson and published by Elsevier Inc. Chapters. This book was released on 2013-11-22 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this chapter is to show how inelastic and quasielastic neutron scattering can be used to study dynamics in a range of materials varying from simple model systems to complex systems that are close to those used in technologically important applications. After a brief overview of the theoretical and instrumental concepts, we use examples to show how different types of atomic and molecular motions can be understood using neutron scattering experiments, frequently in combination with atomistic modeling methods. We cover aspects of physics, chemistry, biology, and materials science, but with the main focus on functional materials.
Book Synopsis Neutron Scattering – Fundamentals by : Jeffrey Penfold
Download or read book Neutron Scattering – Fundamentals written by Jeffrey Penfold and published by Elsevier Inc. Chapters. This book was released on 2013-11-22 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Large-scale structures encompass a broad area of science involving soft matter, biomaterials, and nanotechnology, defined by relatively weak interactions and length scales that extend from nanometer to micrometer. The key features of such systems that require characterization and quantification are surfaces and interfaces, adsorption, thin films, and self-assembly and hierarchical structures in solution and the solid phase. The neutron scattering techniques of neutron reflectivity and small-angle neutron scattering have emerged over the past two decades as important probes of these characteristic features of large-scale structures. In this chapter, the fundamentals of the two techniques are described in detail and the important experimental aspects summarized. Their application over a broad range of science is presented, in a way that highlights their unique properties and their important contribution to the field.
Book Synopsis Fifty Years of Neutron Diffraction, The Advent of Neutron Scattering by : George Edward Bacon
Download or read book Fifty Years of Neutron Diffraction, The Advent of Neutron Scattering written by George Edward Bacon and published by CRC Press. This book was released on 1987 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book aims to trace the history of neutron scattering from its pioneer days, to give an outline of the achievements in its main fields of application - notably magnetism, chemistry, lattice dynamics and biology - and some account of its present status. Articles are contributed by pioneers who have worked in the subject for more than 40 years. With stories and reminiscences of the early days in fifteen different countries, the book captures something of the flavour and opportunities of neutron scattering and shows the changes in the way of life of neutron experimenters over the past fifty years.
Book Synopsis Neutron Scattering by Ferroelectrics by : Viktor Lazarevich Aksenov
Download or read book Neutron Scattering by Ferroelectrics written by Viktor Lazarevich Aksenov and published by World Scientific. This book was released on 1990 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the recent theoretical and experimental developments of neutron scattering by ferroelectrics. A Model description of lattice dynamics of structurally unstable crystals (self-consistent phonon approximation, pseudo-spin formalism, coherent potential approximation etc.) is formulated. The effects of nonlinear excitations and lattice defects in neutron scattering are also discussed.
Book Synopsis Neutron Scattering Study of Quantum Phase Transitions InIntegral Spin Chains by :
Download or read book Neutron Scattering Study of Quantum Phase Transitions InIntegral Spin Chains written by and published by . This book was released on 2006 with total page 1007 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quite a few low-dimensional magnets are quantum-disordered 'spin liquids' with a characteristic gap in the magnetic excitation spectrum. Among these are antiferromagnetic chains of integer quantum spins. Their generic feature are long-lived massive (gapped) excitations (magnons) that are subject to Zeeman splitting in external magnetic fields. The gap in one of the magnon branches decreases with field, driving a soft-mode quantum phase transition. The system then enters a qualitatively new high-field phase. The actual properties at high fields, particularly the spin dynamics, critically depend on the system under consideration. Recent neutron scattering studies of organometallic polymer crystals NDMAP (Haldane spin chains with anisotropy) and NTENP (dimerized S = 1 chains) revealed rich and unique physics.
Book Synopsis Applications of Neutron Scattering to Soft Condensed Matter by : Barbara J Gabrys
Download or read book Applications of Neutron Scattering to Soft Condensed Matter written by Barbara J Gabrys and published by CRC Press. This book was released on 2000-12-21 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutrons, which are a penetrating yet non destructive probe, are ideally suited to studying the structure, organisation and motion of molecules responsible for the physical properties of materials under a variety of conditions. Applications are in fields as diverse as colloid and polymer science, earth sciences, pharmaceutics, biology and engineeri
Book Synopsis Neutron Diffraction and Quasielastic Neutron Scattering Studies of Films of Intermediate-length Alkanes Adsorbed on a Graphite Surface by : Armand Diama
Download or read book Neutron Diffraction and Quasielastic Neutron Scattering Studies of Films of Intermediate-length Alkanes Adsorbed on a Graphite Surface written by Armand Diama and published by . This book was released on 2006 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past several years, we have conducted a variety of elastic neutron diffraction and quasielastic neutron scattering experiments to study the structure and the dynamics of films of two intermediate-length alkane molecules (C n H 2n+2), adsorbed on a graphite basal-plane surface. The two molecules are the normal alkane n -tetracosane [n-CH 3 (CH 2) 22 CH 3] and the branched alkane squalane (C 30 H 62 or 2, 6, 10, 15, 19, 23-hexamethyltetracosane) whose carbon backbone is the same length as teteracosane. The temperature dependence of the monolayer structure of tetracosane and squalane was investigated using elastic neutron diffraction and evidence of two phase transitions was observed. Both the low-coverage tetracosane (C 24 H 50) and squalane (C 30 H 62) monolayers have crystalline-to-"smectic" and "smectic"--To-isotropic fluid phase transitions upon heating. The diffusive motion in the tetracosane and squalane monolayers has been investigated by quasielastic neutron scattering. Two different quasielastic neutron scattering spectrometers at the Center for Neutron Research, National Institute of Standards and Technology (NIST) have been used. The spectrometers differ in both their dynamic range and energy resolution allowing molecular motions to be investigated on time scales in the range 10 -13 --10 -9 s. On these time scales, we observe evidence of translational, rotational, and intermolecular diffusive motions in the tetracosane and squalane monolayers. We conclude that the molecular diffusive motion in the two monolayers is qualitatively similar. Thus, despite the three methyl sidegroups at each end of the squalane molecule, its monolayer structure, phase transitions, and dynamics are qualitatively similar to that of a monolayer of the unbranched tetracosane molecules. With the higher resolution spectrometer at NIST, we have also investigated the molecular diffusive motion in multilayer tetracosane films. The analysis of our measurements indicates slower diffusive motion in the bottom layer of a bilayer tetracosane film compared to that in a monolayer, while the rate of diffusive motion in the bottom two layers of the trilayer film is comparable to that in a monolayer.
Book Synopsis Neutron Scattering Studies of Structural Phase Transitions by : W. Bührer
Download or read book Neutron Scattering Studies of Structural Phase Transitions written by W. Bührer and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Some neutron scattering studies on magnetic and molecular phase... by : Leendert Bevaart
Download or read book Some neutron scattering studies on magnetic and molecular phase... written by Leendert Bevaart and published by . This book was released on 19?? with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theory of Neutron Scattering from Condensed Matter: Nuclear scattering by : Stephen W. Lovesey
Download or read book Theory of Neutron Scattering from Condensed Matter: Nuclear scattering written by Stephen W. Lovesey and published by Oxford University Press, USA. This book was released on 1984 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: An invaluable, up-to-date reference aid for investigators and researchers, this two-volume work develops the principles and concepts of statistical physics and quantum chemistry that are the basis for the interpretation of experimental data. These volumes build on the author's now standard text, Theory of Neutron Scattering (Oxford University Press, 1971), and include expanded coverage of nuclear scattering, with many sections completely rewritten and updated, and many previously unpublished experimental calculations. With a greatly expanded bibliography including 200 new references, this work will interest graduate students and researchers in physics.
Book Synopsis Introduction to the Theory of Thermal Neutron Scattering by : G. L. Squires
Download or read book Introduction to the Theory of Thermal Neutron Scattering written by G. L. Squires and published by Cambridge University Press. This book was released on 2012-03-29 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: A long-awaited reprint of the book that has established itself as the classic textbook on neutron scattering. It will be an invaluable introductory text for students taking courses on neutron scattering, as well as for researchers and those who would like to deepen their knowledge on the subject through self-study.
