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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 49 for “"van der Waals forces"”.
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Detailed Investigations of Capillary and van der Waals Forces in the Adhesion between Solids
… is on characterizing two fundamental forces common to adhesion between solids: capillary and van der Waals forces. These two forces have a significant impact on how solids flow, stick to surfaces, agglomerate and break; therefore, understanding their behavior can lead to better …
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An investigation of the stickinness mechanism and the role of nodes in cribellar spider capture thread
… threads are produced by many members of the spider Infraorder Araneomorphae. Cribellar threads are plesiomorphic for this clade, and adhesive threads are apomorphic. The surface of cribellar thread is formed of thousands of fine fibrils. Basal araneomorphs produce cylindrical fibrils, whereas …
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The effect of applied and magnetic fields on the crystallisation of hydrocarbons
… and applied fields can affect electrostatic forces in molecular solids. It also showed that even the weakest of these forces, Van der Waals forces are affected by applied and magnetic fields.
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Concept and feasibility study of self-organized electrochemical devices
… discovery of " an electric battery" in 1800, advancements have proceeded due to great materials advances. However, the basic configuration he proposed then is still present in today's portable power sources. In this work, using attractive and repulsive London-van der Waals forces, a …
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Design and modeling of carbon nanotube-based compliant mechanisms
… (5,5) carbon nanotubes as the flexural elements. Van der Waals forces were found to affect the kinematic and elastomechanic behavior of the nano-scale parallel guiding mechanism. A modified value of the pseudo-rigid-body model stiffness coefficient is presented to capture the affect of van der …
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Characterization of Mechanical Properties at the Micro/Nano Scale: Stiction Failure of MEMS, High-Frequency Michelson Interferometry and Carbon NanoFibers
Different forces scale differently with decreasing length scales. Van der Waals and surface tension are generally ignored at the macro scale, but can become dominant at the micro and nano scales. This fact, combined with the considerable compliance and large surface areas of micro and nano devices, …
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Carbon Nanotube Mechanics: Continuum Model Development from Molecular Mechanics Virtual Experiments
… than the load and deflection) is used to understand the material response and formulate macroscopic constitutive relations. From results of MM simulations of axial and torsional deformations on SWNTs, Young's modulus, the shear modulus and the wall thickness of an equivalent continuum tube …
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Stereo-Selective Synthesis of Bis-bridged calix[6]arenes
… biological catalysts such as enzymes. In order to achieve this goal, the synthetic catalyst system would need to be constructed so to as complement the size, shape and charge of the specific substrate and/or metal ion that would be required in a particular reaction. This can be accomplished …
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Field-effect transistors on monolayer transition metal dichalcogenides synthesized by chemical vapor deposition
… by Geim et al. in 2004, two-dimensional van der Waals materials (2DMs) have attracted wide research interest for their unique electronic, optical, and mechanical properties. These materials consist of stacked, atomically-thin sheets bonded by van der Waals forces. 2DMs are suited for …
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Charge-carrier transport in amorphous organic semiconductors
… electrical devices. Not only do they have the advantage of tunable properties using chemistry, but organic semiconductors hold the potential of being fabricated cheaply with low temperature deposition on flexible plastic substrates, ink jet printing, or roll-to-roll manufacturing. These …
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Development of the selective-shear coagulation process for ultrafine coal cleaning
In order to produce coal containing less than 2% ash using a physical cleaning process, the coal must initially be ground to liberate the mineral matter. The result is a micronized feed material that cannot be efficiently treated using the commercial methods currently available. Therefore, an …
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Collisional and structural properties of water ice in planet-forming regions
… leading to their formation are not well understood. It is widely accepted that planets form by dust aggregation from the material of protoplanetary disks, with micron-sized particles sticking together by van der Waals forces and kilometre-sized particles sticking together due to gravity. …
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Structural studies of HIV-1 Vif and its SOCS-box domain
… terminus by backbone interaction, based on weak van der Waals forces. Based on the results from cell assays it shows that the residues on the Vif proline-rich motif play an important role in viral infectivity; the proline-rich motif induced structure of the C-terminal tail has been demonstrated …
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The Dynamics of Gas-Surface Energy Transfer in Collisions of Rare Gases with Organic Thin Films
Understanding mechanisms at the molecular level is essential for interpreting and predicting the outcome of processes in all fields of chemistry. Insight into gas-surface reaction dynamics can be gained through molecular beam scattering experiments combined with classical trajectory simulations. In …
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Van Der Waals Interactions Based Rheological Analysis for Electrosterically Stabilized Nano-Sized Alpha Silicon Carbide-Lactobacillus Gg Dispersions
… with biological materials is not well understood. The focus of this dissertation is to determine the mathematical relationships of the forces between nanoparticles and biological agents. The systems under investigation are the alpha-SiC/H2O/LGG polar based systems. The mathematical …
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The Development and Assessment of Computational Approaches to the Thermodynamics and Kinetics of Binding
… hydrogen bonding, electrostatic interactions, van der Waals forces or hydrophobic forces. Molecular recognition plays an important role in biology and mediates interactions between receptors and ligands, antigens and antibodies, nucleic acids and proteins, proteins and proteins, enzymes and …
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Mathematics of double-walled carbon nanotube model: Asymptotic spectral and stability analysis
… nano-tube. Carbon nano-tubes have been considered outstanding candidates to innovate and to promote emerging technologies, due to their remarkable chemical, mechanical, and physical properties. For these technologies, there is a need to develop mathematical models that capture the nature of …
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Biomimetic models for redox enzyme systems
… hydrophobic effects, solvatophobic effects and van der Waals forces are all types of noncovalent interactions. Biological systems have provided much of the inspiration for the development of supramolecular chemistry, and many synthetic supramolecular systems have been designed to mimic …
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Long-range forces in sodium chloride
The third order elastic constants C144 and C166 of NaCl have been determined more accurately than heretofore. The results are C144 = .185 ± .015 and C166 = -.635 ± .015 in units of 10 12 dynes/cm2. The NaCl structure provides one with a unique opportunity for the measurement of long range forces in …
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A comprehensive solvation theory for colloidal forces with application to both neutral and charged systems
… presents a new framework for studying colloidal forces. This framework combines accurate density functional theories for calculating potentials of mean force (or solvation potentials) with McMillian-Mayer theory. Furthermore, combined density functional theory and simulation methods were …
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