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Permanent URI for this communityhttps://hdl.handle.net/20.500.14288/2
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Publication Open Access 3D printing of elastomeric bioinspired complex adhesive microstructures(Wiley, 2021) Dayan, Cem Balda; Chun, Sungwoo; Krishna Subbaiah, Nagaraj; Drotlef, Dirk Michael; Akolpoğlu, Mükrime Birgül; Department of Mechanical Engineering; Sitti, Metin; Faculty Member; Department of Mechanical Engineering; College of Engineering; School of Medicine; 297104Bioinspired elastomeric structural adhesives can provide reversible and controllable adhesion on dry/wet and synthetic/biological surfaces for a broad range of commercial applications. Shape complexity and performance of the existing structural adhesives are limited by the used specific fabrication technique, such as molding. To overcome these limitations by proposing complex 3D microstructured adhesive designs, a 3D elastomeric microstructure fabrication approach is implemented using two-photon-polymerization-based 3D printing. A custom aliphatic urethane-acrylate-based elastomer is used as the 3D printing material. Two designs are demonstrated with two combined biological inspirations to show the advanced capabilities enabled by the proposed fabrication approach and custom elastomer. The first design focuses on springtail- and gecko-inspired hybrid microfiber adhesive, which has the multifunctionalities of side-surface liquid super-repellency, top-surface liquid super-repellency, and strong reversible adhesion features in a single fiber array. The second design primarily centers on octopus- and gecko-inspired hybrid adhesive, which exhibits the benefits of both octopus- and gecko-inspired microstructured adhesives for strong reversible adhesion on both wet and dry surfaces, such as skin. This fabrication approach could be used to produce many other 3D complex elastomeric structural adhesives for future real-world applications.Publication Restricted A fundamental study on the synthesis of aerogel supported bimetallik nanoparticles using supercritical deposition(Koç University, 2012) Bozdağ, Selmi Erim; Erkey, Can; 0000-0001-6539-7748; Koç University Graduate School of Sciences and Engineering; Chemical and Biological Engineering; 29633Publication Open Access Adaptive self-sealing suction-based soft robotic gripper(Wiley, 2021) Song, Sukho; Drotlef, Dirk-Michael; Son, Donghoon; Koivikko, Anastasia; Department of Mechanical Engineering; Sitti, Metin; Faculty Member; Department of Mechanical Engineering; School of Medicine; College of Engineering; 297104While suction cups prevail as common gripping tools for a wide range of real-world parts and surfaces, they often fail to seal the contact interface when engaging with irregular shapes and textured surfaces. In this work, the authors propose a suction-based soft robotic gripper where suction is created inside a self-sealing, highly conformable and thin flat elastic membrane contacting a given part surface. Such soft gripper can self-adapt the size of its effective suction area with respect to the applied load. The elastomeric membrane covering edge of the soft gripper can develop an air-tight self-sealing with parts even smaller than the gripper diameter. Such gripper shows 4 times higher adhesion than the one without the membrane on various textured surfaces. The two major advantages, underactuated self-adaptability and enhanced suction performance, allow the membrane-based suction mechanism to grip various three-dimensional (3D) geometries and delicate parts, such as egg, lime, apple, and even hydrogels without noticeable damage, which can have not been gripped with the previous adhesive microstructures-based and active suction-based soft grippers. The structural and material simplicity of the proposed soft gripper design can have a broad use in diverse fields, such as digital manufacturing, robotic manipulation, transfer printing, and medical gripping.Publication Restricted Chiral and linear spin structures in 2D nanostructured magnonics(Koç University, 2023) Yagan, Rawana; Onbaşlı, Mehmet Cengiz; 0000-0002-3554-7810; Koç University Graduate School of Sciences and Engineering; Electrical and Electronics Engineering; 258783Publication Restricted Communication theoretical modeling and analysis of neuronal communication with synaptic plasticity(Koç University, 2022) Khan, Tooba; Akan, Özgür Barış; 0000-0003-2523-3858; Koç University Graduate School of Sciences and Engineering; Electrical and Electronics Engineering; 6647Publication Restricted Computational and experimental investigation of the critical role of twinning on the plastic deformation of high-manganese austenitic steels and pseudoelasticity of niti shape memory alloys(Koç University, 2015) Gümüş, Berkay; Canadinç, Demircan; 0000-0001-9961-7702; Koç University Graduate School of Sciences and Engineering; Mechanical Engineering; 23433Publication Open Access Design and adoption of low-cost point-of-care diagnostic devices: Syrian case(Multidisciplinary Digital Publishing Institute (MDPI), 2021) Alseed, M. Munzer; Yetişen, Ali K.; Department of Mechanical Engineering; Department of Electrical and Electronics Engineering; Syed, Hamzah; Taşoğlu, Savaş; Onbaşlı, Mehmet Cengiz; Faculty Member; Faculty Member; Faculty Member; Department of Mechanical Engineering; Department of Electrical and Electronics Engineering; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); KU Arçelik Research Center for Creative Industries (KUAR) / KU Arçelik Yaratıcı Endüstriler Uygulama ve Araştırma Merkezi (KUAR); School of Medicine; College of Engineering; 318138; 291971; 258783Civil wars produce immense humanitarian crises, causing millions of individuals to seek refuge in other countries. The rate of disease prevalence has inclined among the refugees, increasing the cost of healthcare. Complex medical conditions and high numbers of patients at healthcare centers overwhelm the healthcare system and delay diagnosis and treatment. Point-of-care (PoC) testing can provide efficient solutions to high equipment cost, late diagnosis, and low accessibility of healthcare services. However, the development of PoC devices in developing countries is challenged by several barriers. Such PoC devices may not be adopted due to prejudices about new technologies and the need for special training to use some of these devices. Here, we investigated the concerns of end users regarding PoC devices by surveying healthcare workers and doctors. The tendency to adopt PoC device changes is based on demographic factors such as work sector, education, and technology experience. The most apparent concern about PoC devices was issues regarding low accuracy, according to the surveyed clinicians.Publication Restricted Design and electromechanical modeling of vertically stacked silicon nanowire arrays as coupled resonators(Koç University, 2012) Yorulmaz, İsmail; Alaca, Burhanettin Erdem; 0000-0001-5931-8134; Koç University Graduate School of Sciences and Engineering; Materials Science and Engineering; 115108Publication Restricted Design of microheater for thermo-optic tuning of silicon photonic filters(Koç University, 2022) Koral, Ahmet Kağan; Mağden, Emir Salih; 0000-0001-7680-6818; Koç University Graduate School of Sciences and Engineering; Electrical and Electronics Engineering; 276368Publication Restricted Development of hybrid layered double hydroxide nanomaterials(Koç University, 2010) Yılmaz, Ceren; Acar, Havva Funda Yağcı; 0000-0001-5601-8814; Koç University Graduate School of Sciences and Engineering; Materials Science and Engineering; 178902
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