Download or read book An Experimental Study on Adhesive or Anti adhesive Bio inspired Experimental Nanomaterials written by Emiliano Lepore and published by Walter de Gruyter GmbH & Co KG. This book was released on 2014-09-18 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adhesive abilities of insects, spiders and reptiles have inspired researchers for a long time. All these organisms show outstanding performance, particularly for force, adhesion and climbing abilities, relative to their size and weight. Scientists have focused on the gecko’s adhesive paw system and climbing abilities. Its adhesion mechanism has been an important topic of research for nearly 150 years. However, certain phenomena of geckos are still not fully understood and represent today the main challenge in several scientific discussions that aim to better understand their adhesive ability. The manuscript deals with the influence of surface roughness on the gecko’s adhesion on the inverted surface of Poly(methyl meth-acrylate) (PMMA) and glass, of PMMA with different surface roughness, on the gecko’s maximum normal adhesive force. In general, the adhesive structure and mechanism of an animal could be connected to the micro-structured roughness of natural substrata (e.g. plant surfaces) in the natural environment. This manuscript focuses on the nanometer scale, which is involved in everything from gecko spatulae to the waxy nanotubules of the lotus leaf, to the fibroin protein materials that constitute spider silks. In general, spider silks display superior mechanical properties, but only in the last few decades, researchers investigated various types of silks and evaluated their very different mechanical properties. The dragline and the flag silks (or radial and circumferential) of orb weaving spiders have been characterized in scientific literature while, to our knowledge, few studies have been conducted on bundles, which connect the cocoons of Meta menardi to the ceiling of caves.
Download or read book An Experimental Study on Adhesive Or Anti adhesive Bio inspired Experimental Nanomaterials written by Emiliano Lepore and published by . This book was released on 2013 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Progress in Adhesion and Adhesives Volume 7 written by K. L. Mittal and published by John Wiley & Sons. This book was released on 2023-12-27 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current book contains eight commissioned chapters and cover topics including stress distribution and design analysis of adhesively bonded tubular composite joints; durability of structural adhesive joints; mechanical surface treatment of adherends for adhesive bonding; surface modification of polymer materials by excimer UV light; corona discharge treatment of materials to enhance adhesion; adhesion activation of aramid fibers; dual-cured hydrogels for bioadhesives and biomedical applications; and non-adhesive SLIPS-like surfaces.
Download or read book Bio inspired Structured Adhesives written by Lars Heepe and published by Springer. This book was released on 2017-07-21 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the adhesion, friction and contact mechanics of living organisms. Further, it presents the remarkable adhesive abilities of the living organisms which inspired the design of novel micro- and nanostructured adhesives that can be used in various applications, such as climbing robots, reusable tapes, and biomedical bandages. The technologies for both the synthesis and construction of bio-inspired adhesive micro- and nanostructures, as well as their performance, are discussed in detail. Representatives of several animal groups, such as insects, spiders, tree frogs, and lizards, are able to walk on (and therefore attach to) tilted, vertical surfaces, and even ceilings in different environments. Studies have demonstrated that their highly specialized micro- and nanostructures, in combination with particular surface chemistries, are responsible for this impressive and reversible adhesion. These structures can maximize the formation of large effective contact areas on surfaces of varying roughness and chemical composition under different environmental conditions.
Download or read book Bio inspired Studies on Adhesion of a Thin Film on a Rigid Substrate written by Zhilong Peng and published by Springer. This book was released on 2015-04-07 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thesis systematically investigates the factors which influence many animals’ robust adhesion abilities and micro-reversible adhesion mechanisms, including the geometric principles of their adhesion, relative humidity, surface roughness and pre-tension. Studies exploring biological adhesion mechanisms are not only of great significance for the design of advanced adhesive materials and adhesion systems for micro-climbing robots, but also very helpful for resolving the problem of adhesion failure in MEMS/NEMS.
Download or read book Challenges and Recent Advances in Sustainable Oil and Gas Recovery and Transportation written by Sanket Joshi and published by Elsevier. This book was released on 2023-03-10 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: Challenges and Recent Advances in Sustainable Oil and Gas Recovery and Transportation delivers a critical tool for today's petroleum and reservoir engineers to learn the latest research in EOR and solutions toward more SDG-supported practices. Packed with methods and case studies, the reference starts with the latest advances such as EOR with polymers and EOR with CCS. Advances in shale recovery and methane production are also covered before layering on sustainability methods on critical topics such as oilfield produced water. Supported by a diverse group of contributors, this book gives engineers a go-to source for the future of oil and gas. The oil and gas industry are utilizing enhanced oil recovery (EOR) methods frequently, but the industry is also tasked with making more sustainable decisions in their future operations. - Provides the latest advances in enhanced oil recovery (EOR), including EOR with polymers, EOR with carbon capture and sequestration (CCS), and hybrid EOR approaches - Teaches options in recovery and transport, such as shale recovery and methane production from gas hydrate reservoirs - Includes sustainability methods such as biological souring and oil field produced water solutions
Download or read book Experiments and Theory on a Bio inspired Film terminated Micro fiber Adhesive written by Lulin Shen and published by . This book was released on 2008 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bioinspired superwettable materials from design fabrication to application written by Jingxin Meng and published by Frontiers Media SA. This book was released on 2023-05-25 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Adhesion and Friction in Biological Systems written by Stanislav N. Gorb and published by Springer. This book was released on 2016-05-01 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores biological systems with surface specializations which increase or decrease friction and adhesion. Studies examine snake skin and adhesive pads in animals, as well as anti-adhesive and adhesive surfaces of plants, among many other examples.
Download or read book Translational Research in Biomedical Sciences Recent Progress and Future Prospects written by Krupakar Parthasarathy and published by Springer Nature. This book was released on with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design in Nature written by Claus Mattheck and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: The chicken bone you nibbled yesterday and threw away was a high-tech product! Not only that: it was a superlative light-weight design, functionally adapted to its mechanical requirements. No engineer in the world has, as yet, been able to copy this structural member, which is excellently optimized in its external shape and its internal architecture as regards minimum weight and maximum strength. The tree stem on which you recently carved your initials has also, by life-long care for its body, steadily improved its internal and external structure and adapted optimally to new loads. In the course of its biomechanical self-optimization it will heal up the notch you cut as speedily as possible, in order to repair even the smallest weak point, which might otherwise cost it its life in the next storm. This book is dedicated to the understanding of this biomechanical optimization of shape. It is the synthesis of many years of extensive research using the latest computer methods at the Karlsruhe Research Centre to help understand the mechanism of biological self-optimization (adaptive growth) and to simulate it by computer. The method newly developed for this purpose was called CAO (Computer-Aided Optimization). With this method, it is possible to predict the growth of trees, bones and other biological structures from the tiger's claw to the sea urchin's skeleton.
Download or read book Adhesion and Friction of a Bio inspired Dry Adhesive and Van Der Waals Interactions written by Jingzhou Liu and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation contains two parts. The part I is on the theory of adhesion and friction behaviors of dry adhesives. Many synthetic bio-inspired adhesives consist of an array of micro-fibrils attached to an elastic backing layer, resulting in a tough and compliant structure. In this part, we first present a three dimensional (3D) model for adhesion enhancement that occurs due to trapping of the interfacial crack in the region between fibrils. Energy release to the crack tip is attenuated because it has to go through the compliant terminal film between fibrils. Using perturbation theory Our model and a finite element method (FEM) we solve for the shape of crack front. also allows us to study how adhesion enhancement depends on the arrangement of fibrils. Then, we examine the nonlinear deformation of a single fibril subjected to a combination of shear and normal loads. An exact closed-form solution is obtained using elliptic functions. The prediction of our model compares well with the results of an indentation experiment. Finally, we model the response of a film-terminated micro-fibril array subjected to shear through contact with a rigid cylindrical indenter. The model matches the experimentally measured shear-force response. The second part is on van der Waals interactions. Van der Waals (vdW) forces are forces between neutral atoms or molecules and are present in all materials. Lifshitz theory of van der Waals interactions is reviewed in the first chapter of this part. It is often assumed that Lifshitz's theory is equivalent to the surface mode method proposed by van Kampen et al. A revisit of van der Waals force between two parallel plates shows that certain procedures in the surface mode method are inconsistent with Lifshitz's theory. Finally, numerical techniques (boundary element method and finite element analysis) to compute vdW forces are formulated. In principle, these numerical approaches can be used to evaluate the van der Waals force between dielectric solids with arbitrary shapes.
Download or read book New Frontiers in Multiscale Modelling of Advanced Materials written by Simone Taioli and published by Frontiers Media SA. This book was released on 2016-01-22 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atomistic simulations, based on ab-initio and semi-empirical approaches, are nowadays widespread in many areas of physics, chemistry and, more recently, biology. Improved algorithms and increased computational power widened the areas of application of these computational methods to extended materials of technological interest, in particular allowing unprecedented access to the first-principles investigation of their electronic, optical, thermodynamical and mechanical properties, even where experiments are not available. However, for a big impact on the society, this rapidly growing field of computational approaches to materials science has to face the unfavourable scaling with the system size, and to beat the time-scale bottleneck. Indeed, many phenomena, such as crystal growth or protein folding for example, occur in a space/time scale which is normally out of reach of present simulations. Multi-scale approaches try to combine different scale algorithms along with matching procedures in order to bridge the gap between first-principles and continuum-level simulations. This Research Topic aims at the description of recent advances and applications in these two emerging fields of ab-inito and multi-scale materials modelling for both ground and excited states. A variety of theoretical and computational techniques are included along with the application of these methods to systems at increasing level of complexity, from nano to micro. Crossing the borders between several computational, theoretical and experimental techniques, this Research Topic aims to be of interest to a broad community, including experimental and theoretical physicists, chemists and engineers interested in materials research in a broad sense.
Download or read book Experimental Design written by Dianne N. Epp and published by . This book was released on 1998 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: ... "developed with the specific goal of enabling high school chemistry teachers to introduce their students to one of the important aspects of chemical engineering and technology: experimental design. Adhesives are used as a tool to illustrate the concept of experimental design, because they are both familiar and of interest ..." -foreword.
Download or read book Bioinspired Structures and Design written by Wole Soboyejo and published by Cambridge University Press. This book was released on 2020-09-17 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master simple to advanced biomaterials and structures with this essential text. Featuring topics ranging from bionanoengineered materials to bio-inspired structures for spacecraft and bio-inspired robots, and covering issues such as motility, sensing, control and morphology, this highly illustrated text walks the reader through key scientific and practical engineering principles, discussing properties, applications and design. Presenting case studies for the design of materials and structures at the nano, micro, meso and macro-scales, and written by some of the leading experts on the subject, this is the ideal introduction to this emerging field for students in engineering and science as well as researchers.
Download or read book Polymeric Systems as Antimicrobial or Antifouling Agents written by Antonella Piozzi and published by MDPI. This book was released on 2020-05-22 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rapid increase in the emergence of antibiotic-resistant bacterial strains, combined with a dwindling rate of discovery of novel antibiotic molecules, has created an alarming issue worldwide. Although the occurrence of resistance in microbes is a natural process, the overuse of antibiotics is known to increase the rate of resistance evolution. Under antibiotic treatment, susceptible bacteria inevitably die, while resistant microorganisms proliferate under reduced competition. Therefore, the out-of-control use of antibiotics eliminates drug-susceptible species that would naturally limit the expansion of resistant species. In addition, the ability of many microbial species to grow as a biofilm has further complicated the treatment of infections with conventional antibiotics. A number of corrective measures are currently being explored to reverse or slow antibiotic resistance evolution, Among which one of the most promising solutions is the development of polymer-based antimicrobial compounds. In this Special Issue, different polymer systems able to prevent or treat biofilm formation, including cationic polymers, antibacterial peptide-mimetic polymers, polymers or composites able to load and release bioactive molecules, and antifouling polymers able to repel microbes by physical or chemical mechanisms are reported. Their applications in the design and fabrication of medical devices, in food packaging, and as drug carriers is investigated.
Download or read book Controllable Adhesion in a Bio inspired Film terminated Fibrillar Surface written by Nichole Kristina Nadermann and published by . This book was released on 2012 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation we present work on the development, characterization, and analysis of an easy-to-fabricate, reusable bioinspired switchable adhesive that consists of a film-terminated fibrillar layer atop a substrate. We use a dynamic rod model and stability analysis to define and analyze the buckling of a fibril subjected to a prescribed shear displacement and a constant normal compressive force. Following this analysis, we present work on the switchable adhesive: a film-terminated fibrillar interface with two metastable states. In the first state, a thin film spanning the fibrillar surface results in strongly enhanced adhesion due to crack-trapping. In the second state, the thin film collapses onto the substrate between fibrils and resembles a rough surface. We perform indentation experiments (pull-off and adhesion hysteresis), which demonstrate differences in the adhesive response of the two states. We show that the adhesive state has a pull-off load up to 70 times higher than the non-adhesive state and has up to 20 times larger adhesion hysteresis. Friction experiments show that in the collapsed state there is no static friction peak and that even in sliding friction, which is not enhanced for the adhesive state over the control samples (flat, unstructured PDMS), the collapsed state exhibits much lower sliding friction forces. We determine the pressure-to-collapse the thin film to switch from the adhesive to the non-adhesive state using hydrostatic pressure experiments. Finally, we perform both linear plate and von Kärman plate analyses on the thin film as it deforms under an applied pressure to gain insight into both bistability and the pressure required to collapse the thin film and in doing so, turn off the adhesion. We find that the von Kärman plate theory more accurately captures the pressure required to initiate collapse of the thin film onto the substrate, most likely because of the large deflections taking place during collapse. To account for pressurization that occurs in our sealed samples during hydrostatic pressure experiments, we model the rate dependence in the hydrostatic pressure experiments. Pressurization and diffusion of gas through the thin film reduces the dependence on interfibrillar spacing.
