Download or read book Adhesion and Wear of Nanoscale Polymer Contacts written by Chen Jiang and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atomic force microscopy (AFM) is a powerful tool for high resolution surface measurements, nanolithography, and tip-based nanomanufacturing. An understanding of the nanoscale tribological behavior of the tip-sample contact, including adhesion and wear, is critical in these applications. In this dissertation, the adhesion and wear of polymethyl methacrylate (PMMA) in contact with an ultrananocrystalline diamond (UNCD) AFM tip is investigated using a combination of AFM-based nanomechanics experiments and finite element analysis (FEA). A novel AFM-based method, which combines pull-off force measurements and characterization of the 3D geometry of AFM tip, was developed to quantify the properties of the adhesive traction-separation relationship of UNCD-PMMA contacts. Adhesion range and strength, as well as work of adhesion, of the contacts were determined. Characterizing and understanding nanoscale wear of polymers has proven difficult in the past due to experimental complications associated with debris produced in the tests and the failure of traditional empirical wear relations, such as Archard's law. Here, nanoscale AFM-based line and raster wear experiments were performed on patterned PMMA structures, which had gaps that allow debris to be captured. Results from the line wear tests indicate that the relationship between height loss rate and stress is well described by a transition state theory wear model. The wear parameters obtained from line wear tests were applied to predict the volume loss in raster wear tests. Despite the significant differences in the loading and sliding geometry between line and raster wear experiments, the raster wear behavior was accurately predicted from the parameters obtained from line wear tests. In addition, experiments at varying temperatures were performed to study the temperature dependence of polymer wear. The results suggest that transition state theory overestimates the effect of temperature on wear for PMMA. Modified models considering viscoelastic relaxation of PMMA and atom-by-atom attrition were applied to describe the measured wear behavior. Finally, an iterative FEA method was developed for simulations of wear. These simulations were used to examine the evolution of geometry and stress during the wear process as a function of contact conditions, such as friction and surface roughness.
Download or read book Nanoscale Investigation of Adhesion Friction and Wear in Chemically Heterogeneous Responsive Polymer Brushes written by Mukesh Kumar Vyas and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamentals of Friction and Wear on the Nanoscale written by Enrico Gnecco and published by Springer Nature. This book was released on with total page 463 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Adhesion Friction and Lubrication written by Hongbo Zeng and published by John Wiley & Sons. This book was released on 2013-02-07 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Adhesion Friction Mechanics of Nanoscale Contacts Between Coated Surfaces Studied by Atomic Friction Force Microscopy written by Nikolaos Nikogeorgos and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamentals of Friction and Wear on the Nanoscale written by Enrico Gnecco and published by Springer. This book was released on 2014-11-05 with total page 703 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an updated review on the development of scanning probe microscopy and related techniques, and the availability of computational techniques not even imaginable a few decades ago. The 36 chapters cover instrumental aspects, theoretical models and selected experimental results, thus offering a broad panoramic view on fundamental issues in nanotribology which are currently being investigated. Compared to the first edition, several topics have been added, including triboluminescence, graphene mechanics, friction and wear in liquid environments, capillary condensation, and multiscale friction modeling. Particular care has been taken to avoid overlaps and guarantee the independence of the chapters. In this way, our book aims to become a key reference on this subject for the next five to ten years to come.
Download or read book Fundamentals of Friction and Wear written by Enrico Gnecco and published by Springer Science & Business Media. This book was released on 2007-05-26 with total page 713 pages. Available in PDF, EPUB and Kindle. Book excerpt: Readers of this book will become familiar with the concepts and techniques of nanotribology, explained by an international team of scientists and engineers, actively involved and with long experience in this field. Edited by two pioneers in the field, the book is suitable both as a first introduction to this fascinating subject, and also as a reference for researchers wishing to improve their knowledge of nanotribology.
Download or read book Adhesion and Adsorption of Polymers written by Lieng-Huang Lee and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: Honolulu is a most beautiful place, suitable for all occa sions. Its choice as the meeting site for the first Joint Chemical Congress between the American Chemical Society and the Chemical Society of Japan was praised by scientists from both sides. During this Congress, the International Conference on Adhesion and Adsorption of Polymers was held at the Hyatt Regency Hotel between April 2 and 5, 1979. We had speakers from ten nations presenting over forty papers related to the subject matter. It was a memorable event. Unlike our two previous adhesion symposia held in 1971 and 1975, this was the first time in the same conference that we discussed both adhesion and adsorption of polymers simultaneously. These two important phenomena are not only inter-related, but also equally important in adhesive technology as well as biochemical processes. The papers presented to this Conference deal with these two phenomena from both fundamental and practical viewpoints. Furthermore, with the advance of new surface analytical techniques, the actual, microscopic happenings at the interfaces can be pin pointed. Thus, characterization of interface became one of the major focuses of this Conference. As a result, a broad coverage of the subject matter includes statistical thermodynamics, surface physics, surface analysis, fracture mechanics, viscoelasticity, failure analysis, surface modification, adsorption kinetics, bio polymer adsorption, etc. Thanks to the diligence of our contri butors, we are now able to publish the final papers in these two volumes.
Download or read book Polymer Tribology written by Sujeet K. Sinha and published by World Scientific. This book was released on 2009 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the new and now-expanding field of friction, wear, and other surface-related mechanical phenomena for polymers. Polymers have been used in various forms such as bulk, films, and composites in applications where their friction, wear resistance, and other surface-related properties have been effectively utilized. There are also many examples in which polymers have performed extremely well, such as in tyres, shoes, brakes, gears, bearings, small moving parts in electronics and MEMS, cosmetics/hair products, and artificial human joints. Around the world, much research is currently being undertaken to develop new polymers, in different forms, for further enhancing tribological performance and for finding novel applications. Keeping in view the importance of tribology of polymers for research and technology as well as the vast literature that is now available in research papers and review articles, this timely book brings together a wealth of research data for an understanding of the basic principles of the subject.
Download or read book Shear Adhesion Friction and Wear of Multi point Micro and Nano scale Contacts written by Wesley Scott Smith and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Adhesion, friction, and wear are the principal failure mechanisms that have limited the use of contacting and sliding surfaces in commercial MEMS applications. As the size of mechanical structures reaches the micro- and nano-scales, surface forces such as van der Waals, capillary, and electrostatic forces dominate the interactions between contacting surfaces. At these scales, the magnitude of the friction force is very sensitive to the complicated interaction between the surface properties, material properties, contact conditions, and environmental conditions. This work investigates the role of the contact conditions on the friction forces and wear rate of a MEMS probe array of small-scale tips in contact with a flat sliding surface. The friction measurement experiment involves a laterally unconstrained slider that sits on top of a MEMS probe array. As the array is laterally actuated, solely friction forces at the tips govern the motion of the slider. MEMS probe arrays enable precise control over the shape and the total number of contact points between the two surfaces. The results show that the friction forces are very sensitive to small changes in the contact or environment conditions. But for a given, well-controlled set of conditions, the friction forces scale linearly with the normal force. However, the friction coefficient is strongly dependent on the total number of contact points and the local conditions around those contact points. Factors such as humidity or adsorbed water on the surfaces further increase the linear relationship between the friction forces and the number of contacts. In addition, the wear rate of the tips is linearly related to the normal force acting at each tip. Factors such as the presence of water on the surface and a stiff vertical contact also lead to high wear rates. This work concludes with a set of recommendations to minimize the detrimental effects of friction and wear at the micro- and nano-scales.
Download or read book Polymer Interface and Adhesion written by Wu and published by CRC Press. This book was released on 1982-03-31 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: Poly mer Interface and Adhesion provides the critical basis for further advancement in thisfield. Combining the principles of interfacial science, rheology, stress analysis, and fracturemechanics, the book teaches a new approach to the analysis of long standing problemssuch as: how is the interface formed; what are its physical and mechanical properties;and how does the interface modify the stress field and fracture strength of the material.The book offers many outstanding features, including extensive listings of pertinent references, exhaustive tabulations of the interfacial properties of polymers, critical reviews ofthe many conflicting theories, and complete discussions of coupling agents, adhesion promotion, and surface modifications. Emphasis is placed on physical concepts and mechanisms, using clear, understandable mathematics.Polymer Interface and Adhesion promotes a more thorough understanding of the physical, mechanical, and adhesive properties of multiphase, polymer systems. Polymer scientistsand engineers, surface chemists, materials scientists, rheologists, as well as chemical andmechanical engineers interested in the research, development or industrial applications ofpolymers, plastics, fibers, coatings, adhesives, and composites need this important newsource b
Download or read book Imaging and Understanding Atomic scale Adhesion and Wear written by Tevis David Bartow Jacobs and published by . This book was released on 2013 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Springer Handbook of Nanotechnology written by Bharat Bhushan and published by Springer. This book was released on 2017-11-05 with total page 1704 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive handbook has become the definitive reference work in the field of nanoscience and nanotechnology, and this 4th edition incorporates a number of recent new developments. It integrates nanofabrication, nanomaterials, nanodevices, nanomechanics, nanotribology, materials science, and reliability engineering knowledge in just one volume. Furthermore, it discusses various nanostructures; micro/nanofabrication; micro/nanodevices and biomicro/nanodevices, as well as scanning probe microscopy; nanotribology and nanomechanics; molecularly thick films; industrial applications and nanodevice reliability; societal, environmental, health and safety issues; and nanotechnology education. In this new edition, written by an international team of over 140 distinguished experts and put together by an experienced editor with a comprehensive understanding of the field, almost all the chapters are either new or substantially revised and expanded, with new topics of interest added. It is an essential resource for anyone working in the rapidly evolving field of key technology, including mechanical and electrical engineers, materials scientists, physicists, and chemists.
Download or read book Polymer Constitutive Properties and Adhesive Effects at the Nanoscale written by Manuel Luis Ballelos Palacio and published by . This book was released on 2004 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nano tribology and Materials in MEMS written by Sujeet K. Sinha and published by Springer Science & Business Media. This book was released on 2013-08-27 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together recent developments in the areas of MEMS tribology, novel lubricants and coatings for nanotechnological applications, biomimetics in tribology and fundamentals of micro/nano-tribology. Tribology plays important roles in the functioning and durability of machines at small length scales because of the problems associated with strong surface adhesion, friction, wear etc. Recently, a number of studies have been conducted to understand tribological phenomena at nano/micro scales and many new tribological solutions for MEMS have been proposed.
Download or read book Metal Ceramic Interfaces written by M. Rühle and published by Elsevier. This book was released on 2013-10-22 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: As engineering materials and structures often contain a metal or metallic alloy bonded to a ceramic, the resultant interface must be able to sustain mechanical forces without failure. They also play an important role in oxidation or reduction of materials. The workshop on 'Bonding, Structure and Mechanical Properties of Metal/Ceramic Interfaces' was held in January 1989 within the Acta/Scripta Metallurgica conference series. It drew together an international collection of 70 scientists who discussed a wide range of issues related to metal-ceramic interfaces. The sessions were divided into 7 categories: structure and bonding, chemistry at interfaces, formation of interfaces, structure of interfaces, thermodynamics/atomistics of interface fracture, mechanics of interface cracks, and fracture resistance of bimaterial interfaces. Within these headings attention was paid to grain boundaries, the influence of chemical processes on the behaviour of interfaces, diffusion bonding, characterization of fracture, and crack propagation by fatigue and by stress corrosion. The book presents a useful reference source for materials scientists, physicists, chemists, and mechanical engineers who are concerned with the roles and properties of interfaces.
Download or read book Adhesion and Bonding to Polyolefins written by D. M. Brewis and published by iSmithers Rapra Publishing. This book was released on 2002 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polyolefins have many and varied applications. However, they have very poor bonding properties. This review discusses ways of improving adhesion and bonding. It describes the theories surrounding adhesion of polyolefins and the analysis techniques which have been used to characterise the material surfaces. Methods of enhancing adhesion are then discussed. An additional indexed section containing several hundred abstracts from the Polymer Library gives useful references for further reading.
