Готові списки джерел за темами / Reversible adhesives

Добірка наукової літератури з теми "Reversible adhesives"

Автор: Grafiati

Опубліковано: 14 березня 2023

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Статті в журналах з теми "Reversible adhesives"

Lu, Nanshu. "Reversible Dry Adhesives." Soft Robotics 3, no. 3 (September 2016): 99–100. http://dx.doi.org/10.1089/soro.2016.29009.nlu.

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Ciardiello, R., B. Martorana, VG Lambertini, and V. Brunella. "Iron-based reversible adhesives: Effect of particles size on mechanical properties." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 8 (October 17, 2017): 1446–55. http://dx.doi.org/10.1177/0954406217736552.

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A hot melt adhesive – mainly used for bonding plastic component in automotive field – was modified with different iron-based particles to give it a reversible behaviour. Mechanical and physical properties of these reversible adhesives were experimentally assessed in the work. The modified adhesives, coupled with electromagnetic induction, are able to guarantee separation of the joints without any damage to the substrates for recycling, reuse or repairing of components. Single lap joint specimens were prepared using epoxy/glass fibres substrates and tests were carried out on neat and modified adhesive with 5% weight of iron and iron oxide. Three different Fe particles size were tested: 450 µm, 60 µm and 1–6 µm. The particles size of iron oxide was 50 nm. Separation was studied using single lap joint specimens under electro-magnetic induction. Experimental results showed that the maximum peak load decreases when the average particles sizes increase. The peak loads of the smallest particles were equal to the ones of the pristine adhesive. The elongation of the adhesives increases when the adhesive is modified with both iron and iron oxide particles. Finally, experimental tests on single lap joints coupled with electro-magnetic induction showed that separation of the substrates is possible using iron oxide particles. Electro-magnetic tests conducted on particles alone, helped to understand that bigger particles are able to overcome the melting temperature of the adhesive but hot-melt adhesives modified with these particles are not able to reach the melting. These tests showed that the number of particles into the adhesive matrix is very important for this kind of tests.

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Viana, Ana S., and Romana Santos. "Nanoscale characterization of the temporary adhesive of the sea urchin Paracentrotus lividus." Beilstein Journal of Nanotechnology 9 (August 24, 2018): 2277–86. http://dx.doi.org/10.3762/bjnano.9.212.

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Background: Unlike the thin homogeneous films that are typical for adhesives produced by humans, biological adhesives present complex hierarchical micro- and nanostructures. Most studies on marine adhesives have focused on permanent adhesives, whereas the nanostructures of nonpermanent, temporary or reversible adhesives have only been examined in some organisms such as marine flatworms, barnacle cyprids, freshwater cnidaria and echinoderms such as sea cucumbers and sea stars. In this study, the first nanoscale characterization of sea urchin temporary adhesives was performed using atomic force microscopy (AFM). Results: The adhesive topography was similar under dry and native (seawater) conditions, which was comprised of a honeycomb-like meshwork of aggregated globular nanostructures. In terms of adhesion forces, higher values were obtained in dry conditions, reaching up to 50 nN. Under native conditions, lower adhesive forces were obtained (up to 500 pN) but the adhesive seemed to behave like a functional amyloid, as evidenced by the recorded characteristic sawtooth force–extension curves and positive thioflavin-T labelling. Conclusion: Our results confirm that like other temporary adhesives, the sea urchin adhesive footprint nanostructure consists of a meshwork of entangled globular nanostructures. Under native conditions, the adhesive footprints of the sea urchin behaved like a functional amyloid, suggesting that among its proteinaceous constituents there are most likely proteins with amyloid quaternary structures or rich in β-sheets. These results extend our knowledge on sea urchin adhesive composition and mechanical properties essential for the engineering of biomimetic adhesives.

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Drotlef, D. M., C. B. Dayan, and M. Sitti. "Bio-inspired Composite Microfibers for Strong and Reversible Adhesion on Smooth Surfaces." Integrative and Comparative Biology 59, no. 1 (April 27, 2019): 227–35. http://dx.doi.org/10.1093/icb/icz009.

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Abstract A novel approach for high-performance gecko-inspired adhesives for strong and reversible adhesion to smooth surfaces is proposed. The composite patterns comprising elastomeric mushroom-shaped microfibers decorated with an extremely soft and thin terminal layer of pressure sensitive adhesive. Through the optimal tip shape and improved load sharing, the adhesion performance was greatly enhanced. A high adhesion strength of 300 kPa together with superior durability on smooth surfaces are achieved, outperforming monolithic fibers by 35 times. Our concept of composite microfibrillar adhesives provides significant benefits for real world applications including wearable medical devices, transfer printing systems, and robotic manipulation.

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Hutchinson, Allan R., Patricia H. Winfield, and Ryan H. McCurdy. "Automotive Material Sustainability Through Reversible Adhesives." Advanced Engineering Materials 12, no. 7 (June 8, 2010): 646–52. http://dx.doi.org/10.1002/adem.200900331.

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Bedenikovic, Theresa, Sigrid Eyb-Green, and Wolfgang Baatz. "Non-Aqueous Facing Methods in Paper Conservation – Part I: Testing Facing Materials." Restaurator. International Journal for the Preservation of Library and Archival Material 39, no. 3 (October 25, 2018): 185–214. http://dx.doi.org/10.1515/res-2018-0009.

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Abstract This study focusses on non-aqueous facing methods in paper conservation. The aim was to develop facing systems which have sufficient adhesive strength to stabilize a paper-based object during a conservation treatment while at the same time being easily reversible after treatment without leaving any residues on the original. A variety of carrier materials, non-aqueous adhesives as well as different methods of adhesive application and activation were combined. Nylon, Rayon and Japanese tissue were coated with Klucel®, BEVA®, Aquazol®, Degalan®, Lascaux® and Plextol®. Adhesives were applied by brushing, spraying, stenciling and stamping. Subsequently, coated tissues were reactivated with different methods such as application of solvent vapors, application of solvents with a sponge or direct application of solvents. In addition, the reactivation was carried out by pressure and/or heat. The adhesive strength was classified using a simple peel test; by dyeing the adhesives, their penetration into the sample papers was made visible, and adhesive residues which may remain on the sample papers could be observed visually.

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Kim, Jae-Kang, and Michael Varenberg. "Drawing-Based Manufacturing of Shear-Activated Reversible Adhesives." ACS Applied Materials & Interfaces 12, no. 17 (April 6, 2020): 20075–83. http://dx.doi.org/10.1021/acsami.0c01812.

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Vattathurvalappil, Suhail Hyder, Syed Fahad Hassan, and Mahmoodul Haq. "Healing potential of reversible adhesives in bonded joints." Composites Part B: Engineering 200 (November 2020): 108360. http://dx.doi.org/10.1016/j.compositesb.2020.108360.

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Büscher, Thies H., Raunak Lohar, Marie-Christin Kaul, and Stanislav N. Gorb. "Multifunctional Adhesives on the Eggs of the Leaf Insect Phyllium philippinicum (Phasmatodea: Phylliidae): Solvent Influence and Biomimetic Implications." Biomimetics 5, no. 4 (November 27, 2020): 66. http://dx.doi.org/10.3390/biomimetics5040066.

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Leaf insects (Phylliidae) are well-camouflaged terrestrial herbivores. They imitate leaves of plants almost perfectly and even their eggs resemble seeds—visually and regarding to dispersal mechanisms. The eggs of the leaf insect Phyllium philippinicum utilize an adhesive system with a combination of glue, which can be reversibly activated through water contact and a water-responding framework of reinforcing fibers that facilitates their adjustment to substrate asperities and real contact area enhancement. So far, the chemical composition of this glue remains unknown. To evaluate functional aspects of the glue–solvent interaction, we tested the effects of a broad array of chemical solvents on the glue activation and measured corresponding adhesive forces. Based on these experiments, our results let us assume a proteinaceous nature of the glue with different functional chemical subunits, which enable bonding of the glue to both the surface of the egg and the unpredictable substrate. Some chemicals inhibited adhesion, but the deactivation was always reversible by water-contact and in some cases yielded even higher adhesive forces. The combination of glue and fibers also enables retaining the adhesive on the egg, even if detached from the egg’s surface. The gained insights into this versatile bioadhesive system could hereafter inspire further biomimetic adhesives.

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Cui, Wei, Ruijie Zhu, Yong Zheng, Qifeng Mu, Menghan Pi, Qiang Chen, and Rong Ran. "Transforming non-adhesive hydrogels to reversible tough adhesives via mixed-solvent-induced phase separation." Journal of Materials Chemistry A 9, no. 15 (2021): 9706–18. http://dx.doi.org/10.1039/d1ta00433f.

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Non-adhesive hydrogels are tailored to show tough adhesion to various solid surfaces by a universal phase-separation method. This method opens the possibility of utilizing non-adhesive hydrogels for emerging soft–rigid hybrid devices.

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Більше джерел

Дисертації з теми "Reversible adhesives"

CIARDIELLO, RAFFAELE. "Functionalization of adhesives and composite matrix by micro and nanoparticle addition." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2709342.

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The use of nano and microfillers in research and industrial areas have been increasing in recent decades. In material industry especially, the combination of specific nano and microparticles properties has been studying since they can offer a great contribution to the resolution of tough issues. One of these issues is the possibility to disassemble components for repairing, recycling or avoiding waste when errors occur in manufacturing processes. The disassembly of mechanical component is still an open issue and there are many technical problems that are involved in this process. For example, the possibility to have a clean surface of the separated component after the disassembly or the possibility to introduce damages to other linked components. This dissertation investigates the possibility to disassemble a hot-melt adhesive, used in automotive industries to join plastic components, by embedding iron nanoparticles, Fe3O4, that are sensitive to electromagnetic induction. This peculiarity makes the modified adhesives able to melt when an electromagnetic field is oriented on it and so the joint separation is possible. The mechanical and physical properties of these nanomodified adhesives, with different particles concentrations of iron oxide, were studied and compared with the pristine adhesive. This correlation was necessary in order to assess the possibility to use these modified adhesives in the vehicle assemblies since the pristine adhesive is already used by some car manufacturers for internal and external components. Separation tests of plastic joints were evaluated and the most sensitive factors were stated and analysed. The shape of the inductor coil, the diameter of the pipe coil, the frequency of the applied magnetic field and the applied current were found to be influencing factors of the induction heating process. The possibility to use cheaper particles, iron microparticles coupled with electromagnetic induction, together with the possibility to bond composite, glass fibre-reinforced plastics (GFRP), substrates were assessed as well. Composite components have been replacing many structural and non-structural components in automotive design in order to reduce the vehicle weight. The opportunity to disassemble adhesive with graphene nanoparticles embedded in the same hot-melt adhesive and coupled with microwave was assessed as well. The heating of this particles is possible by means of the π electron mechanism In recent decades, researchers and industries have been also investigating the possibility to make a material electrically conductive. In this PhD dissertation, the possibility to make a structural epoxy resin electrically conductive have been discussed as well. In order to make the material electrically conductive, different coatings of glass spheres with conductive GnPs were tried, as well, but in these cases, the coating results was not satisfactory. For these reasons the chosen filler concentration for these tests was set at 1% (volume fraction) for the conductive filler and 30% (volume fraction) for the hollow glass spheres. These were the maximum concentration that it was possible to embed in the epoxy matrix in order to obtain an easy processability of the material. The modified epoxy resins were not conductive they showed interesting mechanical properties especially under compressive load.

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Sayer, Robert A. "Surface construction and mechanisms of adhesion in tokay gecko feet and characterization of a bio-inspired reversible adhesive tape." Connect to resource, 2006. http://hdl.handle.net/1811/6438.

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Анотація:

Thesis (Honors)--Ohio State University, 2006.
Title from first page of PDF file. Document formatted into pages: contains vii, 71 p.; also includes graphics. Includes bibliographical references (p. 61-67). Available online via Ohio State University's Knowledge Bank.

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Книги з теми "Reversible adhesives"

Pang, Changhyun, Chanseok Lee, Hoon Eui Jeong, and Kahp-Yang Suh. Skin and dry adhesion. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199674923.003.0022.

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Close observation of various attachment systems in animal skins has revealed various exquisite multi-scale architectures for essential functions such as locomotion, crawling, mating, and protection from predators. Some of these adhesion systems of geckos and beetles have unique structural features (e.g. high-aspect ratio, tilted angle, and hierarchical nanostructure), resulting in mechanical interlocking mediated by van der Waals forces or liquid secretion (capillary force). In this chapter, we present an overview of recent advances in bio-inspired, artificial dry adhesives, and biomimetics in the context of nanofabrication and material properties. In addition, relevant bio-inspired structural materials, devices (clean transportation device, interlocker, biomedical skin patch, and flexible strain-gauge sensor) and microrobots are briefly introduced, which would shed light on future smart, directional, and reversible adhesion systems.

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Poppinga, Simon, Ulrike Bauer, Thomas Speck, and Alexander G. Volkov. Motile traps. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198779841.003.0014.

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We review the biomechanics, functional morphology, and physiology of motile traps. The movements of snap traps in Aldrovanda and Dionaea, motile adhesive traps in Drosera and Pinguicula, and suction traps in Utricularia are driven by active water displacement processes leading to reversible turgor changes of motor cells, irreversible growth, or mechanical pre-stressing of tissues. In some cases, the motion is amplified by the release of elastic energy stored in these tissues. The only known case of a passive motile trapping movement is the ‘springboard’ trapping mechanism of Nepenthes gracilis, in which a rapid vibration of the pitcher lid is actuated by the impact force of raindrops. Open research questions are summarized and future studies are suggested.

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Частини книг з теми "Reversible adhesives"

del Campo, Aránzazu, and Juan Pedro Fernández-Blázquez. "Bio-Inspired Reversible Adhesives for Dry and Wet Conditions." In Biomimetic Approaches for Biomaterials Development, 259–72. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527652273.ch11.

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Popov, Valentin L. "Adhesion Hysteresis Due to Chemical Heterogeneity." In Springer Tracts in Mechanical Engineering, 473–83. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_20.

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AbstractAccording the JKR theory of adhesivecontact, changes of the contact configuration after formation of the adhesive neck and before detaching are completely reversible. This means, that after formation of the initial contact, the force-distance dependencies should coincide, independently of the direction of the process (indentation or pull-off). In the majority of real systems, this invariance is not observed. The reasons for this may be either plastic deformation in the contacting bodies or surface roughness. One further mechanism of irreversibility (and corresponding energy dissipation) may be chemical heterogeneity of the contact interface leading to the spatial dependence of the specific work of adhesion. In the present paper, this “chemical” mechanism is analyzed on a simple example of an axisymmetric contact (with axisymmetric heterogeneity). It is shown that in the asymptotic case of a “microscopic heterogeneity”, the system follows, during both indentation and pull-off, JKR curves, however, corresponding to different specific surface energies. After the turning point of the movement, the contact area first does not change and the transition from one JKR curve to the other occurs via a linear dependency of the force on indentation depth. The macroscopic behavior is not sensitive to the absolute and relative widths of the regions with different surface energy but depends mainly on the values of the specific surface energy.

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M. Sridhar, Laxmisha, Andrew T. Slark, and James A. Wilson. "Furan Functionalized Polyesters and Polyurethanes for Thermally Reversible Reactive Hotmelt Adhesives." In Furans and Furan Derivatives - Recent Advances and Applications [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.100426.

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New reactive hotmelt (RHM) adhesives based on thermally reversible Diels-Alder networks comprising multifunctional furan and maleimide prepolymers are described. The prepolymer mixture is easy to apply in the bulk from the melt and after application to the substrates, the adhesive undergoes polymerization at room temperature resulting in crosslinked bonds. Due to their thermoplastic nature and low melt viscosity at hot melt application temperatures, the adhesives provide processing properties similar to moisture cured polyurethanes (PUR). The technology is isocyanate-free and does not require moisture to initiate the crosslinking. Bonding and tensile properties of the RHM adhesive can be readily tuned by prepolymer design and provide cure rates similar to PUR adhesives. The Diels-Alder adhesives provide versatile adhesion to a variety of substrates and good creep resistance up to the retro temperature. The adhesives show good thermal stability during application and can be recycled multiple times by simple heating/cooling of the bonds providing similar performance. Several furan and maleimide prepolymers were scaled up to multi-Kg quantities to demonstrate the potential for industrial scalability. The results demonstrate that furan-maleimide reversible chemistry can be used for RHM application as a more sustainable alternative to conventional moisture curing PURs which tend to contain harmful residual isocyanate monomers.

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M. Sridhar, Laxmisha, and Timothy M. Champagne. "High-Performance Reworkable Underfill Adhesives Based on Dicyclopentadiene Epoxy Thermoset." In Adhesives - Science, Technology, Recent Advances, and Applications [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.107334.

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A highly reliable and reworkable underfill adhesive based on thermoset epoxy resin possessing thermally reversible dicyclopentadiene (DCPD) moiety is described. The adhesive can be cured rapidly at moderate temperatures resulting in high Tg cured network, which gives high reliability to the bonded semiconductor components. The inherent thermal reversibility of DCPD moiety causes network breakdown at high temperatures enabling easy removal of defective semiconductor chips. A discernible trend between loading level of the thermally reversible epoxy resin and high-temperature die shear strength was observed. Using this novel adhesive system, both high reliability and reworkability can be achieved concurrently, which is normally not possible with other thermoset adhesive systems. The epoxy resin used in the study was scaled up to multi-kg quantities demonstrating industrial applicability of the approach.

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Тези доповідей конференцій з теми "Reversible adhesives"

Heepe, Lars, Alexander E. Kovalev, Michael Varenberg, Jan Tuma, and Stanislav N. Gorb. "Biologically inspired reversible adhesives: where are we now?" In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Akhlesh Lakhtakia. SPIE, 2012. http://dx.doi.org/10.1117/12.914553.

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Schmid, Cyrill, and Maria Sakovsky. "Variable Stiffness Structures through Reversible Lamination Using Dry Adhesives." In AIAA SCITECH 2022 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2022. http://dx.doi.org/10.2514/6.2022-0652.

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Brunella, Valentina, Giulia Spezzati, Ermias Gebrekidan Koricho, Giovanni Belingardi, Brunetto Martorana, Fabrice Bondji Ngabang, and Marco Simioli. "Novel Use of Electromagnetic-Sensitive Nano-Additives to Develop Reversible Hot-Melt Adhesives." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84913.

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The paper describes the use of electromagnetic-sensitive nano-particle additive for developing a reversible hot-melt adhesive for structural applications. A prototype of a lower tail gate has been manufactured by means of this innovative technology to demonstrate the potential for joining plastic components in automotive and aerospace applications. Monitoring of nanoparticles release during preparation of modified adhesives shows very low environmental impact if the mixing process is performed under a fume hood. The innovative electromagnetic bonding process can provide to the manufacturing industry new opportunities in terms of simplification of productive lay-out, more flexible design and process rapidity, in addition to significant economic benefit. The reversibility of the process would also increase the chances for part reuse and/or recycling that would otherwise be discarded.

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Pulskamp, Jeffrey S., Ronald G. Polcawich, and Kenn Oldham. "Highly Integrated PiezoMEMS Enabled Millimeter-Scale Robotics." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87231.

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This report provides an overview of ongoing research at the U.S. Army Research Laboratory regarding the development of piezoelectric MEMS-enabled millimeter-scale robotics. Research topics include the development of enabling technologies for terrestrial locomotion, insect-inspired micro-flight, gecko-inspired reversible adhesives, and piezoelectric energy harvesting. The development of complementary lead zirconate titanate thin film MEMS devices, applicable to highly integrated millimeter-scale robotics, is also reviewed.

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Tamelier, John, Sathya Chary, Kimberly Turner, Jing Yu, Saurabh Das, and Jacob Israelachvili. "Millimeter size patch behavior of gecko-inspired reversible adhesive." In 2011 IEEE Sensors. IEEE, 2011. http://dx.doi.org/10.1109/icsens.2011.6127159.

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Scheulen, Klaus, Anne Schwarz, and Stefan Jockenhoevel. "Reversible contacting of smart textiles with adhesive bonded magnets." In the 17th annual international symposium. New York, New York, USA: ACM Press, 2013. http://dx.doi.org/10.1145/2493988.2494338.

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"Nuevos adhesivos estructurales reversibles basados en resinas epoxi." In XV Congreso Iberoamericano de Ingeniería Mecánica. Universidad Nacional de Educación a Distancia (España), 2022. http://dx.doi.org/10.5944/bicim2022.228.

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Zandvakili, Mersedeh, Mohammad Mahdi Honari, Dan Sameoto, and Pedram Mousavi. "Microfluidic liquid metal based mechanically reconfigurable antenna using reversible gecko adhesive based bonding." In 2016 IEEE/MTT-S International Microwave Symposium (IMS). IEEE, 2016. http://dx.doi.org/10.1109/mwsym.2016.7540271.

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Deng, L., H. Fang, X. Shuai, G. Zhang, C. P. Wong, and R. Sun. "Preparation of reversible thermosets and their application in temporary adhesive for thin wafer handling." In 2015 IEEE 65th Electronic Components and Technology Conference (ECTC). IEEE, 2015. http://dx.doi.org/10.1109/ectc.2015.7159747.

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Nachman, R. L., R. L. Silverstein, and A. S. Asch. "THROMBOSPONDIN: CELL BIOLOGY OF AN ADHESIVE GLYCOPROTEIN." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644653.

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Анотація:

Thrombospondin (TSP), a multifunctional 450 KD glycoprotein is a secretory product of thrombin stimulated platelets. It is a major component of the platelets alpha granule constituting approximately 3% of total platelet protein. Thrombospondin does not circulate in appreciable concentrations ∽0 100 ng/ml); however, the tissue distribution is broad. In addition to its expression on the membrane of activated platelets, the protein is synthesized by fibroblasts endothelial cells, glial cell smooth muscle cells alveolar pneumocytes mononuclear phagocytes and various tumor cells. TSP is a major constituent of the extracellular matrix and has been demonstrated in the vessel wall, basement membrane and glandular connective tissue. Fibroblasts, smooth muscle cells and endothelial cells in tissue culture incorporate TSP into the extracellular matrix. Matrix TSP is under cell-cycle regulatory control. Mesenchymal cells in the proliferative phase synthesize greater amounts of TSP than non growing cells. Platelet derived growth factor induces smooth muscle cell and glial cell synthesis of TSP. Atheromatous lesions contain increased amounts of TSP compared to normal vessels emphasizing the potential role of TSP in the interaction of proliferating cells with the matrix. TSP binds specifically, saturably, and reversibly to mouse peritoneal macrophages and to cells of the monocyte-like human cell line U937. Binding was time dependent and was optimal in the presence of both Ca++ and Mg++. PMA stimulated U937 cells and activated macrophages bound TSP to an equivalent extent as resting cells. The TSP binding site on the surface of U937 cells and peripheral blood monocytes mediates the adhesive interaction between these cells and thrombin-stimulated platelets. Using a sensitive rosetting assay we found that monocytes were not rosetted by resting platelets while >90% were rosetted by thrombin-stimulated platelets. Monoclonal and polyclonal anti-TSP antibodies markedly inhibited rosetting as did TSP itself. Antifibronectin or non-immune control antibodies did not inhibit rosetting, nor did fibronectin, fibrinogen, the fibronectinadhesion tetrapeptide arg-gly-asp-ser (RGDS), or heparin. The TSP membrane receptor, an 88 KD glycoprotein, formely known as GPIV has been identified in platelets, endothelial cells, monocytes and a variety of tumor cells. TSP may thus serve as a molecular bridge linking activated platelets with monocytes at sites of early vascular injury. Such interactions involving the TSP receptor complex may be of critical importance in the regulation of thrombosis and the initiation of atherosclerosis.

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