Bibliografías temáticas / Polyurethane biomimetics

Literatura académica sobre el tema "Polyurethane biomimetics"

Autor: Grafiati
Publicado: 14 de marzo de 2023

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Artículos de revistas sobre el tema "Polyurethane biomimetics"

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Kumari, Pallavi, Neta Ginzburg, Tali Sayas, Sigal Saphier, Patricia Bucki, Sigal Brown Miyara, Denise L. Caldwell, Anjali S. Iyer-Pascuzzi y Maya Kleiman. "A biomimetic platform for studying root-environment interaction". Plant and Soil 447, n.º 1-2 (13 de diciembre de 2019): 157–68. http://dx.doi.org/10.1007/s11104-019-04390-6.

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Abstract Aims Microstructure plays an important role in biological systems. Microstructural features are critical in the interaction between two biological organisms, for example, a microorganism and the surface of a plant. However, isolating the structural effect of the interaction from all other parameters is challenging when working directly with the natural system. Replicating microstructure of leaves was recently shown to be a powerful research tool for studying leaf-environment interaction. However, no such tool exists for roots. Roots present a special challenge because of their delicacy (specifically of root hairs) and their 3D structure. We aim at developing such a tool for roots. Methods Biomimetics use synthetic systems to mimic the structure of biological systems, enabling the isolation of structural function. Here we present a method which adapts tools from leaf microstructure replication to roots. We introduce new polymers for this replication. Results We find that Polyurethane methacrylate (PUMA) with fast UV curing gives a reliable replication of the tomato root surface microstructure. We show that our system is compatible with the pathogenic soilborne bacterium Ralstonia solanacearum. Conclusions This newly developed tool may be used to study the effect of microstructure, isolated from all other effects, on the interaction of roots with their environment.
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Tonda-Turo, Chiara, Monica Boffito, Claudio Cassino, Piergiorgio Gentile y Gianluca Ciardelli. "Biomimetic polyurethane – Based fibrous scaffolds". Materials Letters 167 (marzo de 2016): 9–12. http://dx.doi.org/10.1016/j.matlet.2015.12.117.

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Lin, Hsin-Hua, Fu-Yu Hsieh, Ching-Shiow Tseng y Shan-hui Hsu. "Preparation and characterization of a biodegradable polyurethane hydrogel and the hybrid gel with soy protein for 3D cell-laden bioprinting". Journal of Materials Chemistry B 4, n.º 41 (2016): 6694–705. http://dx.doi.org/10.1039/c6tb01501h.

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Zhang, Fanjun, Rong Wang, Yuanyuan He, Weiwei Lin, Yuxi Li, Yiqi Shao, Jiehua Li et al. "A biomimetic hierarchical structure with a hydrophilic surface and a hydrophobic subsurface constructed from waterborne polyurethanes containing a self-assembling peptide extender". Journal of Materials Chemistry B 6, n.º 26 (2018): 4326–37. http://dx.doi.org/10.1039/c8tb01279b.

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Chen, Po-Hsuen, Hsueh-Chung Liao, Sheng-Hao Hsu, Rung-Shu Chen, Ming-Chung Wu, Yi-Fan Yang, Chau-Chung Wu, Min-Huey Chen y Wei-Fang Su. "A novel polyurethane/cellulose fibrous scaffold for cardiac tissue engineering". RSC Advances 5, n.º 9 (2015): 6932–39. http://dx.doi.org/10.1039/c4ra12486c.

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A high mechanical strength and biomimetic scaffold is electrospun from a blend of polyurethane and ethyl cellulose, being promising in applications for therapeutic purposes as a cardiac graft for reconstructing or regeneration of damaged myocardium.
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Krut'ko, V. K., L. Yu Maslova, O. N. Musskaya, T. V. Safronova, N. L. Budeiko y A. I. Kulak. "Bioactive calcium phosphate foam ceramics modified by biomimetic apatite". Proceedings of the National Academy of Sciences of Belarus, Chemical Series 58, n.º 2 (8 de junio de 2022): 158–68. http://dx.doi.org/10.29235/1561-8331-2022-58-2-158-168.

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By combining the method of replication of polyurethane foam matrices at 1200 °C and modification in model SBF (Simulated Body Fluid) solutions of various compositions, open-pore calcium phosphate foam ceramics with a porosity of 53-60 % was obtained. The architecture and morphology of the calcium phosphate foam ceramics surface was formed by using polyurethane foam matrices («Granufoam», «STR») with different porosity and quantity of open pores. Modification of the calcium phosphate foam ceramics in SBF solutions of various compositions leads to a slight decrease in porosity to 3 %, which indicates the formation of an ultrathin apatite layer. The calcium phosphate-modified foam ceramics consisted of β-tricalcium phosphate, β-calcium pyrophosphate, α-tricalcium phosphate, and biomimetic apatite. In the standard SBF solution, the formation of apatite on calcium phosphate foam ceramics occurs slowly (14-56 days) and the strength increases by a factor of 2 as compared to the initial one. Soaking of calcium phosphate foam ceramics in SBF without HCO3- leads to the formation of biomimetic apatite with inclusions of calcium chloride dihydrophosphate in spherulites. Modification in a 5-fold concentrated SBF solution for 3-5 days at 37 °C makes it possible to form 6-10 times more biomimetic apatite compared to standard SBF with a 2.5-fold increase in static strength to 0.05 MPa. It has been established that at 800 °C biomimetic apatite crystallizes into β- tricalcium phosphate.
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Feng, Jianyong. "Preparation and performance control of poly(lactic acid) fiber/polyurethane composite porous biomimetic-aligned scaffolds". Journal of Industrial Textiles 46, n.º 6 (28 de julio de 2016): 1297–318. http://dx.doi.org/10.1177/1528083715624257.

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Because of important potential and application prospect of aligned scaffolds in tissue engineering, it is necessary to prepare aligned scaffolds different from previous methods. We have prepared poly(lactic acid) fiber/polyurethane adhesive composite-aligned scaffolds by 1000 poly(lactic acid) melt parallel arrangement fibers and different polyurethane contents at 5, 10, 20, 25, and 30% separately. It can be found that polyurethane contents have great influence on bonding effect between fiber and adhesive, surface and cross-sectional morphology, thickness, weight, contact angle, stress and strain, pore diameter, porosity, pore interconnectivity, water absorption, and gelatin impregnation. The maximum of pore diameter and porosity of aligned scaffolds can be achieved to 64.24 µm and 66.67% by controlling poly(lactic acid) fiber parallel arrangement and polyurethane adhesive content. Moreover, the ultimate stresses of aligned scaffolds are 3.47 MPa along length direction and 1.02 MPa in width direction. Each composite-aligned scaffold has better fiber parallel arrangement, pore structure, and stress.
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Maslova, L. Yu, V. K. Krut’ko, O. N. Musskaya, T. V. Safronova y A. I. Kulak. "Formation of biomimetic apatite on calcium phosphate foam ceramics in the concentrated model solution". Perspektivnye Materialy 10 (2022): 23–30. http://dx.doi.org/10.30791/1028-978x-2022-10-23-30.

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By firing polyurethane foam templates (“STR” brand, 12 pores per cm, China) with a porosity of ~ 65 % at 1200 °С, an open-pore calcium phosphate foam ceramics was obtained using a highly concentrated suspension based on synthetic hydroxyapatite, heat-treated at 800 °С, monocalcium phosphate monohydrate and 0.8 % polyvinyl alcohol. The resulting calcium phosphate foam ceramics after modification in the SBF (Simulated Body Fluid) solution concentrated 5 times (SBF×5) consisted of β-tricalcium phosphate, β-calcium pyrophosphate and biomimetic apatite, had a porosity of 53 – 59 % and a static strength of ~ 0.05 MPa. The formed biomimetic apatite, consisting of amorphous calcium phosphate Ca9(PO4)6 and apatite tricalcium phosphate Ca9HPO4(PO4)5OH, crystallizes into β-tricalcium phosphate at 1200 °С. Calcium phosphate foam ceramics modified with biomimetic apatite, after soaking in 5 % hydroxyapatite gel and SBF×5, which simulating a bone defect in vitro, in parallel with the formation of biomimetic apatite, is partially destroyed, which confirmed its high bioactivity and degradation.
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Yu, Hua Bing y Rui Feng Li. "Preparation of Biomimetic Superhydrophobic Silica/Polyurethane Composite Coating". Advanced Materials Research 785-786 (septiembre de 2013): 974–77. http://dx.doi.org/10.4028/www.scientific.net/amr.785-786.974.

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The SiO2/PU composite coatings were prepared by the bionic methods. First, nanosilica (SiO2) was prepared by sol-gel method using tetraethyl orthosilicate (TEOS) as the precursor. Then, by a simple spray process. The formation mechanism and the structure characteristics of the coating were analyzed. The coating surface was characterized using scanning electron microscopy (SEM). The effect of the content of the SiO2 and the dosage of PU and PEAC on the coating structure and contact angle was also studied. The results show that the coating surface has the similar micro-nanostructure with a lotus leaf, and the SiO2 content is 9%, the total content of PU and PEAC is 15%, that the contact angle of coating can reach 161°and rolling angle can reach 3°, and that the SiO2/PU composite coating possesses good super-hydrophobic properties.
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Sartori, Susanna, Valeria Chiono, Chiara Tonda-Turo, Clara Mattu y Ciardelli Gianluca. "Biomimetic polyurethanes in nano and regenerative medicine". J. Mater. Chem. B 2, n.º 32 (2014): 5128–44. http://dx.doi.org/10.1039/c4tb00525b.

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Tesis sobre el tema "Polyurethane biomimetics"

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Chung, Ting-Hsiu y 鍾定修. "Synthesis, Characterization of Biomimetic Electroactive Polyurethane Coatings and Their Application on Corrosion Protection". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/24066317803086694889.

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碩士
中原大學
化學研究所
103
Abstract The successful preparation of high mechanical property and superhydrophobic structure electroactive polyurethane elastomer containing amine-capped aniline trimer (ACAT) is presented for the first time. First of all, ACAT was synthesized by carrying out oxidative coupling reactions between aniline and para-phenylenediamine, After which it was characterized through Fourier-transformation infrared (FTIR), electrospray ionization time-of-flight mass spetra (ESI-TOF Mass) and Nuclear Magnetic Resonance spectromter (NMR). Finally, the redox behavior of ACAT was further analyzed by cyclic voltammetric (CV). Subsequently, a polyurethane (PU) prepolymer was prepared by polymerizing diisocyanate of isophorone diisocyanate and diol of polyether. Electroactive polyurethane elastomer (EPU) was then produced by allowing the as-prepared polyurethane prepolymer to react with ACAT under suitable conditions. Non-electroactive polyurethane (NEPU) was also prepared polyurethane prepolymer to react with isophorondiamine (IPDA). Nanocasting technique was used to obtain a biomimetic superhydrophobic electroactive polyurethane (SEPU) surface structure from a natural Xanthosoma sagittifoliuim leaf. The superhydrophobic electroactive material could be used as advanced coatings that protect metals against corrosion. The morphology of the surface of the as-synthesized SEPU coating was investigated using scanning electron microscopy (SEM). The surface showed numerous micro mastoids, each decorated with many nano wrinkles. The water contact angle (CA) for the SEPU coating was 152.21°, which was significantly larger than that for the EPU coating (i.e., CA=58.75°). The significant increase in the contact angle indicated that the biomimetic morphology effectively repelled water. The developed SEPU coating exhibited superior anticorrosion performance on electrochemical corrosion tests as its corrosion rate is better than the bare steel substrate. The significantly-improved corrosion protection is attributed to, besides the steel substrate isolated by the coating, the synergistic effect of electroactivity and hydrophobic from the SEPU coating dwith the multi-scale structures mimicking the surface of Xanthosoma sagittifoliuim leaf.
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Capítulos de libros sobre el tema "Polyurethane biomimetics"

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Zietek, P. A., B. A. Butruk y T. Ciach. "Endothelial Cells Adhesion on Modified Polyurethane Surface as the Way to Fabricate a Novel Material for Cardiosurgery". En Biological and Biomimetic Adhesives, 149–63. Cambridge: Royal Society of Chemistry, 2013. http://dx.doi.org/10.1039/9781849737135-00149.

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Actas de conferencias sobre el tema "Polyurethane biomimetics"

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Yu, Min, Zhendong Dai y Shengrong Yang. "Preparation and properties of polyurethane/silicone materials for biomimetic gecko setae". En SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, editado por Nakhiah C. Goulbourne y Hani E. Naguib. SPIE, 2014. http://dx.doi.org/10.1117/12.2044968.

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Ciardelli, Gianluca, Susanna Sartori, Antonella Silvestri, Piero Serafini, Andrea Caporale, Francesca Boccafoschi, A. D’Amore, Domenico Acierno y Luigi Grassia. "Multiblock polyurethanes in biomedical applications: fine tuning of degradation and biomimetic properties". En V INTERNATIONAL CONFERENCE ON TIMES OF POLYMERS (TOP) AND COMPOSITES. AIP, 2010. http://dx.doi.org/10.1063/1.3455567.

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Rouse, Ciaphus, Benjamin Estrada, Caleb Sailors, Christian Schneider, Sean Henderson y Ayse Tekes. "Development of Single Piece Designed Compliant Locomotive Mechanism". En ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-70121.

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Abstract Biomimetic robots have been the focus of many studies for the last decades since the motion in nature is accomplished through the bending of the flexible arms once subjected to an input force, displacement or torque as opposed to their rigid body counterparts thereby increasing the workspace. This study presents the design, analysis, and modeling of a novel monolithically designed compliant mechanism. The mechanism consists of two translational springs, three sliding carts, housing for the two servo motors, and two rigid-flexure-rigid (RFR) arms. While the main body of the biomimetic robot can be 3D printed using polyethylene terephthalate glycol (PETG), the RFR links are 3D printed in thermoplastic polyurethane (TPU) to prevent yielding when loaded. The mechanism model is derived using D’Alembert’s principles, pseudo rigid body modeling, and kinematic constraints. Finite element analysis is performed in MSC Adams and simulation model outputs are validated through experimental data for forward motion.
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Pai, Nikhil, Andrea Contreras Esquen, Coskun Tekes, Amir Ali Amiri Moghadam y Ayse Tekes. "Design and Development of a Fish-Like, Soft Biomimetic Robot". En ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-94635.

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Abstract Among the robotic systems, biomimetic robots performing fish-like locomotion have been the focus of much attention recently as there are many applications for swimming robots, including monitoring of underwater environments, detection of pollution, and disaster relief. This study presents the design and development of a biomimetic fish-like robot based on real carp locomotion. The robot has five main body parts including the head, soft neck, hinged body, compliant tail, and caudal fin. The head houses three ultrasonic sensors to guide the robot while connected to the body through two degrees of freedom (DOF) soft link resembling the neck vertebrate. The 2 DOF soft link enables the head to bend up, down, left, and right which is essential for controlling the soft robot’s direction. The body is connected to the soft tail using a quick return crank mechanism to actuate the tail. The tail integrates a soft tail and a rigid caudal fin. While all parts of the soft fish-like robot are 3D printed using polylactic acid (PLA), thermoplastic polyurethane (TPU), the mold is made from silicone rubber to waterproof. The ultrasonic sensors are utilized to detect obstacles so that the robot may maneuver around. The swimming pattern only for two-dimensional motion is tested in the air and underwater. According to the experimental results, the proposed robot better imitates the fish through its soft 2 DOF link and tail.
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Peel, Larry D., James Mejia, Ben Narvaez, Kyle Thompson y Madhuri Lingala. "Development of a Simple Morphing Wing Using Elastomeric Composites as Skins and Actuators". En ASME 2008 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2008. http://dx.doi.org/10.1115/smasis2008-544.

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Morphing wings are desired for their ability to reduce drag, change flight characteristics, and perhaps reduce weight by eliminating flap / aileron mechanisms. Development of two generations of a student morphing wing project is documented. The second wing was further developed by Peel. The work shows how a relatively low cost but realistic morphing wing test-bed can be fabricated. Wing skin, actuator, and actuator attachment development are discussed, as well as possible auxetic skin behavior. Aerodynamic characterization of the wing will be discussed in another paper. A very simple morphing wing was fabricated in phase one. The nose was able to elastically camber down ∼ 25° and the tail 20°. Actuation was provided by three pneumatic “Rubber Muscle Actuators” (RMA) that produce high contractive forces. Upper and lower wing skins were fabricated from carbon fiber / polyurethane elastomer laminates. Lower skin buckling, actuator air leaks and actuator attachment problems were resolved in the second phase. A finite element model of the generation II wing was developed and is being used to refine/ explore the morphing wing test-bed. The second generation wing fabrication methodology shows smooth elastic cambering and no buckling or waviness in the skins. The nose cambered down 23° and the tail cambered down to 15°. Improved leak-free biomimetic actuators and attach points now include no metal parts, have higher actuation forces due to new braided sheaths and functionally gradient matrix properties.
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