Modification Of Adhesion And Friction By Surface Structuring
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Modification Of Adhesion And Friction By Surface Structuring
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Author : Ying Bai
language : en
Publisher:
Release Date : 2014
Modification Of Adhesion And Friction By Surface Structuring written by Ying Bai and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Enhanced and selective adhesion, and controlled friction between contact surfaces are highly desirable mechanical properties for high-level functional materials. There are many instances in nature where such properties have been obtained by design of near-surface architecture. Inspired by many highly functional biological systems, we have explored bio-mimetic materials with different surface patterning, with the goal of designing surfaces that have unique combinations of contact mechanical properties. In the studies presented here, we show how: (a) highly selective adhesion can be achieved by complementarity of patterned charge and shape, and (b) how friction can be modulated by spatial variation in stiffness, and how structured surfaces interact with surface roughness. We consider how adhesion selectivity can be accomplished by complementarity of shape and inter-surface forces. We have studied an example each of charge and shape complementarity for selective adhesion between extended surfaces. First, we studied theoretically how surfaces patterned with stripes of charge interact with each other, and exhibit strong selectivity on rigid surfaces. However, deformability of the surfaces plays a crucial role in modulating adhesion by accommodating mismatches. To achieve shape complementarity, we designed and fabricated patterned elastomeric surfaces with lines of channels and complementary ridges with dimensions at the micrometer scale. We show that such surfaces have highly enhanced effective adhesion for shape complementary pairs and low adhesion between surfaces with a shape mismatch. We find that the pillar/channel combinations form defects to accommodate interfacial misalignment. These defects are interfacial dislocations. Adhesion between complementary surfaces is enhanced by crack trapping and friction, and attenuated due to the energy released by dislocation structures. In addition to enhanced adhesion, we studied the deliberate control of friction through near-surface micro-structures. Friction measurements on elastomeric surfaces patterned with periodic variation in stiffness show that it undergoes an "auto-roughening" transition under shear and this process can strongly attenuate overall sliding friction. Friction reduction is due to reduction of real contact area, as the initially full contact breaks up into partial contact at the interface. Finite element analysis demonstrates how auto-roughening depends on the modulus mismatch, frictional stress and normal displacement. A surface with random roughness is used to study sliding friction against micro-channel structures under fixed normal force. In contrast to a smooth surface, against which structured surfaces all have highly reduced sliding friction, the roughened surface can exhibit significantly larger frictional force on a structured surface. The enhancement of sliding friction is governed by channel depth, spacing and applied normal force.
Tailoring Surfaces Modifying Surface Composition And Structure For Applications In Tribology Biology And Catalysis
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Author : Nicholas D Spencer
language : en
Publisher: World Scientific
Release Date : 2011-03-08
Tailoring Surfaces Modifying Surface Composition And Structure For Applications In Tribology Biology And Catalysis written by Nicholas D Spencer and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-03-08 with Technology & Engineering categories.
The focus of this book is surface modification, with the goal of tailoring materials for a specific application. By means of this approach, ideal bulk properties of a material, such as its tensile strength (temperature stability, density, or even cost) can be combined with optimized surface properties, such as hardness, biocompatibility, low or high friction or adhesion, water repellency or wettability, or catalytic activity.The works of the author — many of his crucial papers are included — deal with the understanding and modification of surfaces and span fields including catalysis, analytical surface science, self-assembled monolayers, tribology, biomaterials, superhydrophobicity and polymer coatings.
Surface Effects In Adhesion Friction Wear And Lubrication
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Author : Donald H. Buckley
language : en
Publisher: Elsevier
Release Date : 1981-01-01
Surface Effects In Adhesion Friction Wear And Lubrication written by Donald H. Buckley and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981-01-01 with Science categories.
Surface effects in adhesion, friction, wear, and lubrication
Surface Modification And Mechanisms
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Author : George E. Totten
language : en
Publisher: CRC Press
Release Date : 2004-04-30
Surface Modification And Mechanisms written by George E. Totten and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-04-30 with Science categories.
Navigating through an extensive compilation of surface modification reactions and processes for specific tribological results, this reference compiles detailed studies, many not found in other texts, on various residual stresses, reaction processes and mechanisms, heat treatment methods, plasma-based techniques, laser impingement, nanometer scale surface modification, and more. Surface Modification and Mechanisms: Friction, Stress, and Reaction Engineering offers guidelines for the consideration and design of wear and frictional performance and provides a unique understanding of surface structural changes that occur during various engineering procedures.
Tailoring Surfaces
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Author : Nicholas D. Spencer
language : en
Publisher: World Scientific
Release Date : 2011
Tailoring Surfaces written by Nicholas D. Spencer and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Technology & Engineering categories.
The focus of the book is the modification of surfaces to tailor them for a specific purpose. Using this method of surface modification, materials chosen for their bulk properties (tensile strength, temperature stability, density, price can be optimized for any particular application, which can lead to improved hardness, biological inertness or activity, corrosion resistance, low or high friction or adhesion, water repellency or wettability, or catalytic activity. The works of the author — many of his crucial papers are included — touches upon these surface properties and spans fields including catalysis, analytical surface science, self-assembled monolayers, tribology, biomaterials, superhydrophobicity and polymer coatings.
Polymer Surface Modification Relevance To Adhesion
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Author : Kash L. Mittal
language : en
Publisher: CRC Press
Release Date : 2007-05-11
Polymer Surface Modification Relevance To Adhesion written by Kash L. Mittal and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-05-11 with Science categories.
This book documents the proceedings of the Fifth International Symposium on this topic, held in Toronto. The book is divided into two parts: Part 1: Surface Modification Techniques; Part 2: Adhesion Improvement to Polymer Surfaces. Various ways to modify a host of polymer surfaces for a variety of purposes are covered in this book, with emphasis on latest developments. There is a tremendous current interest in devising new ways or ameliorating the existing techniques to modify polymer surfaces to attain desired characteristics because of its importance in a legion of technological areas, and all signals indicate that this interest will continue unabated. So this book should fill the need and should be a valuable addition to the literature.
Surface Modification Technologies
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Author : Antonello Astarita
language : en
Publisher: Trans Tech Publications Ltd
Release Date : 2019-07-22
Surface Modification Technologies written by Antonello Astarita and has been published by Trans Tech Publications Ltd this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-07-22 with Technology & Engineering categories.
The book is a collection of the papers and the keynote lectures presented at the 33rd Surface Modification Technologies Conference (SMT33) which was held in Naples on 26 to 28 June 2019. The conference was focused on surface engineering and covered the following areas: corrosion, treatments, characterization, additive manufacturing, coatings, modification technologies. This book transfers up-to-date knowledge from scientist and experts to the common practice, representing a valuable resource for engineers, designers, researchers, and students.
Polymer Adhesion Friction And Lubrication
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Author : Hongbo Zeng
language : en
Publisher: John Wiley & Sons
Release Date : 2013-02-07
Polymer Adhesion Friction And Lubrication written by Hongbo Zeng and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-02-07 with Technology & Engineering categories.
Specifically dedicated to polymer and biopolymer systems, Polymer Adhesion, Friction, and Lubrication guides readers to the scratch, wear, and lubrication properties of polymers and the engineering applications, from biomedical research to automotive engineering. Author Hongbo Zeng details different experimental and theoretical methods used to probe static and dynamic properties of polymer materials and biomacromolecular systems. Topics include the use of atomic force microscopy (AFM) to analyze nanotribology, polymer thin films and brushes, nanoparticles, rubber and tire technology, synovial joint lubrication, adhesion in paper products, bioMEMS, and electrorheological fluids.
Molecular Adhesion And Friction At Elastomer Polymer Interfaces
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Author : Betul Buehler
language : en
Publisher:
Release Date : 2006
Molecular Adhesion And Friction At Elastomer Polymer Interfaces written by Betul Buehler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Adhesion categories.
We have studied the contact interface between elastomeric poly(dimethyl siloxane) (PDMS) lenses with various solid surfaces during adhesion and friction using IRvisible sum frequency generation spectroscopy (SFG). SFG in total internal reflection geometry can be used to determine molecular structure at the polymer/solid and polymer/polymer contact interfaces. It is a nonlinear optical technique, which detects the orientation and density of molecules at interfaces. In this study, we have designed a novel approach to couple SFG with adhesion and friction experiments. The solid surfaces were chosen to be octadecytrichlorosilane monolayer (OTS), poly(vinyl noctadecyl carbamate-co-vinyl acetate) (PVNODC), polystyrene (PS), poly(n-butyl methacrylate) (PnBMA), and poly(n-propyl methacrylate) (PnPMA). In the first part of the research, we have concentrated on the importance of characterizing the static contact interface to understand adhesion. Our results for the contact between two macroscopic rough surfaces, OTS and oxygen plasma treated PDMS, show surprising surface restructuring, which results in adhesion hysteresis. The short PDMS chains generated during plasma treatment are locally confined between two flattened asperities and are as strongly ordered as OTS. SFG spectra from other surfaces (sapphire substrates and fluorinated monolayers) indicate that short PDMS chains require not only confinement but also an ordered template provided by the methyl groups of OTS. In the second part, we have studied the sliding contact interfaces of various polymers with PDMS. The friction forces between PDMS lenses and glassy PS are a factor of four higher than PDMS sliding on crystalline well-packed PVNODC surfaces. This cannot be explained by the difference in adhesion energy or hysteresis. The in-situ SFG measurements indicate local interpenetration during contact, which is evident from the change in orientation of PS phenyl groups upon mechanical contact and during sliding compared to that at the PS surface. Such a local penetration is unexpected at room temperature (T[subscript R]) that is much below the T[subscript g] of PS. For comparison, we have also studied PnBMA and PnPMA having T[subscript g] below and above T[subscript R], respectively. Preliminary studies at the contact and sliding interfaces with PDMS exhibited similar interpenetration based on adhesion, friction and SFG results regardless of the bulk T[subscript g]. Our results indicate that the adhesion energy and hysteresis of surfaces are not sufficient to predict their friction properties, which makes the characterization of the molecular structure at the static and dynamic contact essential. Finally, we have reported a fabrication process of constructing polymer surfaces with multiwalled carbon nanotube hairs. The force measurements with scanning force microscope indicated strong nanometer level adhesion forces, 200 times higher than those observed for Gecko foot-hairs. These forces are a combination of van der Waals forces and energy dissipation during the elongation of the carbon nanotubes which comes from their material properties.
Structure Property Relationships In Surface Modified Ceramics
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Author : C.J. McHargue
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Structure Property Relationships In Surface Modified Ceramics written by C.J. McHargue and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.
The use of ion beams for the modification of the structure and properties of the near-surface region of ceramics began in earnest in the early 19805. Since the mechanical properties of such materials are dominated by surface flaws and the surface stress state, the use of surface modification tech niques would appear to be an obvious application. As is often the case in research and development, most of the initial studies can be characterized as cataloging the response of various ceramic materials to a range of ion beam treatments. The systematic study of material and ion beam parameters is well underway and we are now designing experiments to provide specific information about the processing parameter - structure-property rela tionships. This NATO-Advanced Study Institute was convened in order to assess our current state of knowledge in this field, to identify opportunities and needs for further research, and to identify the potential of such processes for technological application. It became apparent that this class of inorganic compounds, loosely termed ceramics, presents many challenges to the understanding of ion-solid inter actions, the relationships among ion-beam parameters, materials parameters, and the resulting structures, as well as relationships between structure and properties. In many instances, this understanding will represent a major extension of that learned from the study of metals and semiconductors.