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Articles de revues sur le sujet « Polyurethane biomimetics »

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Auteur : Grafiati
Publié le 14 mars 2023

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1

Kumari, Pallavi, Neta Ginzburg, Tali Sayas, Sigal Saphier, Patricia Bucki, Sigal Brown Miyara, Denise L. Caldwell, Anjali S. Iyer-Pascuzzi et Maya Kleiman. « A biomimetic platform for studying root-environment interaction ». Plant and Soil 447, no 1-2 (13 décembre 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 et Gianluca Ciardelli. « Biomimetic polyurethane – Based fibrous scaffolds ». Materials Letters 167 (mars 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 et 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, no 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, no 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 et Wei-Fang Su. « A novel polyurethane/cellulose fibrous scaffold for cardiac tissue engineering ». RSC Advances 5, no 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 et A. I. Kulak. « Bioactive calcium phosphate foam ceramics modified by biomimetic apatite ». Proceedings of the National Academy of Sciences of Belarus, Chemical Series 58, no 2 (8 juin 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, no 6 (28 juillet 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 et 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, et Rui Feng Li. « Preparation of Biomimetic Superhydrophobic Silica/Polyurethane Composite Coating ». Advanced Materials Research 785-786 (septembre 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 et Ciardelli Gianluca. « Biomimetic polyurethanes in nano and regenerative medicine ». J. Mater. Chem. B 2, no 32 (2014) : 5128–44. http://dx.doi.org/10.1039/c4tb00525b.

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Hou, Cheng Wei, et Zhi Jiang Cai. « A Novel Long-Life Air Working Electro-Active Actuator Based on Cellulose and Polyurethane Blend ». Advanced Materials Research 298 (juillet 2011) : 40–44. http://dx.doi.org/10.4028/www.scientific.net/amr.298.40.

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In this paper, electro-active actuator made with cellulose and polyurethane blend film is prepared, which can show high bending displacement in the air with room humidity condition. To fabricate this actuator, cotton cellulose was dissolved into a N,N-dimethylacetamide (DMAc) and lithium chloride (LiCl) solvent system. Polyurethane prepared by poly[di(ethylene glycol) adipate] and hexamethylene diisocyanate (HDI) was mixed with DMAc cellulose solution by stirring. The mixed solution was cast to form a film followed by depositing thin gold electrode on both sides of the film. The actuator was actuated under AC voltage at an ambient condition by changing the actuation voltage, frequency and time. The actuator revealed a large bending displacement under low activation voltage, low electrical power consumption and good durability at room condition. This cellulose- polyurethane blend actuator is suitable for dry and durable actuator and promising for many biomimetic applications in foreseeable future.
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Yang, Zhijun, Fenfen Wang, Chi Zhang, Jian Li, Rongchun Zhang, Qiang Wu, Tiehong Chen et Pingchuan Sun. « Bio-inspired self-healing polyurethanes with multiple stimulus responsiveness ». Polymer Chemistry 10, no 24 (2019) : 3362–70. http://dx.doi.org/10.1039/c9py00383e.

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High-performance stimuli-responsive polymers that exhibit spontaneous, sophisticated and reversible responses to a wide range of external stimuli are reported, adapting a stimuli-responsive dynamic covalent chemical crosslinker and a biomimetic modular polymer design.
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WONG, CYNTHIA, PATEL SHITAL, RUI CHEN, AMAL OWIDA et YOS MORSI. « BIOMIMETIC ELECTROSPUN GELATIN–CHITOSAN POLYURETHANE FOR HEART VALVE LEAFLETS ». Journal of Mechanics in Medicine and Biology 10, no 04 (décembre 2010) : 563–76. http://dx.doi.org/10.1142/s0219519410003551.

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Native heart valve leaflets are subjected to continuous pulsatile and homodynamic forces and can be as thin as 300 μm. For a proper function of the valve the materials selected for the leaflets need to be biocompatible, robust, flexible, and have comparable mechanical properties to the natural ones. In this paper, biocompatibility and cell retention ability for gelatin–chitosan polyurethane (PU), polyglycolide (PGA)/PLA and collagen-coated bovine pericardium were examined and their mechanical properties were tested. Endothelial cells, isolated from ovine carotid arteries were seeded onto these materials and exposed to a range of shear-stresses for a period of 1–3 h. The findings indicated that throughout the exposure time and the shear-stress range tested, a mean cell retention rate of 80% was obtained in the gelatin–chitosan PU group. However, for PGA/PLA and pericardium groups it was found that as the exposure time of shear-stress increased, a significant cell reduction was observed. Noticeably for all the range of physiological flow conditions tested, the electrospun gelatin–chitosan PU demonstrated good biocompatibility and cell retention properties and could be potentially used as a biomaterial for tissue engineering of heart valves.
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Xie, Jiazhuo, Yuechao Yang, Bin Gao, Yongshan Wan, Yuncong C. Li, Jing Xu et Qinghua Zhao. « Biomimetic Superhydrophobic Biobased Polyurethane-Coated Fertilizer with Atmosphere “Outerwear” ». ACS Applied Materials & ; Interfaces 9, no 18 (28 avril 2017) : 15868–79. http://dx.doi.org/10.1021/acsami.7b02244.

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Francolini, I., F. Crisante, A. Martinelli, L. D’Ilario et A. Piozzi. « Synthesis of biomimetic segmented polyurethanes as antifouling biomaterials ». Acta Biomaterialia 8, no 2 (février 2012) : 549–58. http://dx.doi.org/10.1016/j.actbio.2011.10.024.

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Ścierski, Wojciech, Grażyna Lisowska, Grzegorz Namysłowski, Maciej Misiołek, Jan Pilch, Elżbieta Menaszek, Radosław Gawlik et Marta Błażewicz. « Reconstruction of Ovine Trachea with a Biomimetic Composite Biomaterial ». BioMed Research International 2018 (17 octobre 2018) : 1–9. http://dx.doi.org/10.1155/2018/2610637.

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The aim of this study was to evaluate a novel composite material for tracheal reconstruction in an ovine model. A polymer containing various forms of carbon fibers (roving, woven, and nonwoven fabric) impregnated with polysulfone (PSU) was used to create cylindrical tracheal implants, 3 cm in length and 2.5 cm in diameter. Each implant, reinforced with five rings made of PSU-impregnated carbon-fiber roving, had three external layers made of carbon-fiber woven fabric and the inner layer formed of carbon-fiber nonwoven fabric. The inner surface of five implants was additionally coated with polyurethane (PU), to promote migration of respiratory epithelium. The implants were used to repair tracheal defects (involving four tracheal rings) in 10 sheep (9-12 months of age; 40-50 kg body weight). Macroscopic and microscopic characteristics of the implants and tracheal anastomoses were examined 4 and 24 weeks after implantation. At the end of the follow-up period, outer surfaces of the implants were covered with the tissue which to various degree resembled histological structure of normal tracheal wall. In turn, inner surfaces of the prostheses were covered only with vascularized connective tissue. Inner polyurethane coating did not improve the outcomes of tracheal reconstruction and promoted excessive granulation, which contributed to moderate to severe stenosis at the tracheal anastomoses. The hereby presented preliminary findings constitute a valuable source of data for future research on a tracheal implant being optimally adjusted for medical needs.
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Saleh, Tawfik A., Nadeem Baig, Fahd I. Alghunaimi et Norah W. Aljuryyed. « A flexible biomimetic superhydrophobic and superoleophilic 3D macroporous polymer-based robust network for the efficient separation of oil-contaminated water ». RSC Advances 10, no 9 (2020) : 5088–97. http://dx.doi.org/10.1039/c9ra06579b.

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Ozdemir, Ekrem. « Biomimetic CO2Sequestration : 1. Immobilization of Carbonic Anhydrase within Polyurethane Foam ». Energy & ; Fuels 23, no 11 (19 novembre 2009) : 5725–30. http://dx.doi.org/10.1021/ef9005725.

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Tan, Dongsheng, Liuxu Liu, Zhen Li et Qiang Fu. « Biomimetic surface modification of polyurethane with phospholipids grafted carbon nanotubes ». Journal of Biomedical Materials Research Part A 103, no 8 (18 février 2015) : 2711–19. http://dx.doi.org/10.1002/jbm.a.35403.

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An, Suyeong, Byoung Soo Kim et Jonghwi Lee. « Porous polyurethane films having biomimetic ordered open pores : Indentation properties ». Journal of Industrial and Engineering Chemistry 33 (janvier 2016) : 362–65. http://dx.doi.org/10.1016/j.jiec.2015.10.023.

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Tian, Zilu, Shiyang Yu, Huimin Wang, Yubin Yang, Xuanyan Zhu et Song Zhu. « Biomimetic Mineralized Hydrophilic Polyurethane Primers for Inducing Dentin Tubule Fillings ». Polymers 14, no 21 (3 novembre 2022) : 4716. http://dx.doi.org/10.3390/polym14214716.

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This experiment aimed to synthesize a biomimetic mineralized hydrophilic polyurethane dentin primer containing DDDEEKC peptide (DDDEEKC-PU) to fill dentin tubules and induce mineralization. The degree of conversion (DC) was tested. Dentin samples were acid-etched and treated with DDDEEKC-PU. They were immersed in stimulated human fluid (SBF) for 7, 14 and 28 days. Dentin permeability, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and Vickers hardness were measured. After 28 days, regenerated minerals were deposited on resin tags which were confirmed to be hydroxyapatite (HAp). The minerals reduced the dentin permeability and improved the microhardness. DDDEEKC-PU was able to fill dental tubules immediately and induce mineralization simultaneously.
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Ghorbani, Farnaz, et Ali Zamanian. « Oxygen-plasma treatment-induced surface engineering of biomimetic polyurethane nanofibrous scaffolds for gelatin-heparin immobilization ». e-Polymers 18, no 3 (24 mai 2018) : 275–85. http://dx.doi.org/10.1515/epoly-2017-0185.

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AbstractPolyurethane (PU) has been extensively used in vascular tissue engineering due to its outstanding mechanical performance and blood compatibility behavior. Here, biomimetic PU-based scaffolds were prepared using an electrospinning technique and gelatin-heparin was introduced as a surface modifier after oxygen plasma treatment to improve cell attachment and release an anticoagulation agent. Morphology, Fourier transform infrared (FTIR) spectroscopy, compression strength, swelling and biodegradation ratio, drug release level and cellular interactions were evaluated. According to the scanning electron microscopy (SEM) micrographs, gelatin-heparin immobilized PU nanofibers exhibited a smooth surface and a bead free structure that nanofibers distributed in the range of 300–1000 nm. The mechanical strength of constructs, swelling and biodegradation ratio, and drug release level illustrated higher values for oxygen plasma-treated samples compared with bilayered scaffolds. Cellular adhesion and biocompatibility ameliorated after plasma treatment. All the mentioned findings indicated the initial physicomechanical and biological potential of biomimetic PU-based fibers in the improvements of vascular scaffolds.
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Qin, Liguo, Mahshid Hafezi, Hao Yang, Guangneng Dong et Yali Zhang. « Constructing a Dual-Function Surface by Microcasting and Nanospraying for Efficient Drag Reduction and Potential Antifouling Capabilities ». Micromachines 10, no 7 (23 juillet 2019) : 490. http://dx.doi.org/10.3390/mi10070490.

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To improve the drag-reducing and antifouling performance of marine equipment, it is indispensable to learn from structures and materials that are found in nature. This is due to their excellent properties, such as intelligence, microminiaturization, hierarchical assembly, and adaptability. Considerable interest has arisen in fabricating surfaces with various types of biomimetic structures, which exhibit promising and synergistic performances similar to living organisms. In this study, a dual bio-inspired shark-skin and lotus-structure (BSLS) surface was developed for fabrication on commercial polyurethane (PU) polymer. Firstly, the shark-skin pattern was transferred on the PU by microcasting. Secondly, hierarchical micro- and nanostructures were introduced by spraying mesoporous silica nanospheres (MSNs). The dual biomimetic substrates were characterized by scanning electron microscopy, water contact angle characterization, antifouling, self-cleaning, and water flow impacting experiments. The results revealed that the BSLS surface exhibited dual biomimetic features. The micro- and nano-lotus-like structures were localized on a replicated shark dermal denticle. A contact angle of 147° was observed on the dual-treated surface and the contact angle hysteresis was decreased by 20% compared with that of the nontreated surface. Fluid drag was determined with shear stress measurements and a drag reduction of 36.7% was found for the biomimetic surface. With continuous impacting of high-speed water for up to 10 h, the biomimetic surface stayed superhydrophobic. Material properties such as inhibition of protein adsorption, mechanical robustness, and self-cleaning performances were evaluated, and the data indicated these behaviors were significantly improved. The mechanisms of drag reduction and self-cleaning are discussed. Our results indicate that this method is a potential strategy for efficient drag reduction and antifouling capabilities.
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Song, Eun-Ho, Kyeong-Il Cho, Hyoun-Ee Kim et Seol-Ha Jeong. « Biomimetic Coating of Hydroxyapatite on Glycerol Phosphate-Conjugated Polyurethane via Mineralization ». ACS Omega 2, no 3 (16 mars 2017) : 981–87. http://dx.doi.org/10.1021/acsomega.7b00036.

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Wang, Cundong, Haixia Wang et Huabing Yu. « Preparation and application of biomimetic superhydrophobic silica and polyurethane composite coating ». International Journal of Surface Science and Engineering 9, no 6 (2015) : 510. http://dx.doi.org/10.1504/ijsurfse.2015.072832.

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Ismail, Yahya A., Jose G. Martinez et Toribio F. Otero. « Polyurethane microfibrous mat templated polypyrrole : Preparation and biomimetic reactive sensing capabilities ». Journal of Electroanalytical Chemistry 719 (avril 2014) : 47–53. http://dx.doi.org/10.1016/j.jelechem.2014.01.025.

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Luo, Kun, Li Wang, Xiaohu Chen, Xiyang Zeng, Shiyi Zhou, Peicong Zhang et Junfeng Li. « Biomimetic Polyurethane 3D Scaffolds Based on Polytetrahydrofuran Glycol and Polyethylene Glycol for Soft Tissue Engineering ». Polymers 12, no 11 (9 novembre 2020) : 2631. http://dx.doi.org/10.3390/polym12112631.

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In this study, a novel polyurethane porous 3D scaffold based on polyethylene glycol (PEG) and polytetrahydrofuran glycol (PTMG) was developed by in situ polymerization and freeze drying. Aliphatic hexamethylene diisocyanate (HDI) as a nontoxic and safe agent was adopted to produce the rigid segment in polyurethane polymerization. The chemical structure, macrostructure, and morphology—as well as mechanical strength of the scaffolds—were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM), and tensile tests. The results show that the HDI can react mildly with hydroxyl (–OH) groups of PEG and PTMG, while gas foaming action caused by the release of CO2 occurred simultaneously in the reactive process, resulting in a uniform porous structure of PU scaffold. Moreover, the scaffolds were soaked in water and freeze dried to obtain higher porosity and more interconnective microstructures. The scaffolds have a porosity of over 70% and pore size from 100 to 800 μm. The mechanical properties increased with increasing PEG content, while the hydrophilicity increased as well. After immersion in simulated body fluid (SBF), the scaffolds presented a stable surface structure. The gas foaming/freezing drying process is an excellent method to prepare skin tissue engineering scaffold from PTMG/PEG materials with high porosity and good inter connectivity.
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Liu, Quanyong, Li Gao et Lei Jiang. « Biomimetic preparation and multi-scale microstructures of nano-silica/polyurethane elastomeric fibers ». Progress in Natural Science : Materials International 23, no 6 (décembre 2013) : 532–42. http://dx.doi.org/10.1016/j.pnsc.2013.12.001.

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Raut, Piyush W., Ajinkya A. Shitole, Anand Khandwekar et Neeti Sharma. « Engineering biomimetic polyurethane using polyethylene glycol and gelatin for blood-contacting applications ». Journal of Materials Science 54, no 14 (22 avril 2019) : 10457–72. http://dx.doi.org/10.1007/s10853-019-03643-0.

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Oopath, Sruthi Venugopal, Avinash Baji et Mojtaba Abtahi. « Biomimetic Rose Petal Structures Obtained Using UV-Nanoimprint Lithography ». Polymers 14, no 16 (13 août 2022) : 3303. http://dx.doi.org/10.3390/polym14163303.

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This study aims to produce a hydrophobic polymer film by mimicking the hierarchical micro/nanostructures found on the surface of rose petals. A simple and two-step UV-based nanoimprint lithography was used to copy rose petal structures on the surface of a polyurethane acrylate (PUA) film. In the first step, the rose petal was used as a template, and its negative replica was fabricated on a commercial UV-curable polymer film. Following this, the negative replica was used as a stamp to produce rose petal mimetic structures on UV curable PUA film. The presence of these structures on PUA influenced the wettability behavior of PUA. Introducing the rose petal mimetic structures led the inherently hydrophilic material to display highly hydrophobic behavior. The neat PUA film showed a contact angle of 65°, while the PUA film with rose petal mimetic structures showed a contact angle of 138°. Similar to natural materials, PUA with rose petal mimetic structures also displayed the water pinning effect. The water droplet was shown to have adhered to the surface of PUA even when the surface was turned upside down.
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Pan, Wenxin, et Quan Chen. « Preparation and electroactuation of water-based polyurethane-based polyaniline conductive composites ». e-Polymers 22, no 1 (1 janvier 2022) : 182–89. http://dx.doi.org/10.1515/epoly-2022-0005.

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Abstract Ionic polymer-based conductive composite is a new type of ionic electroactive polymer smart material, which is composed of two electrodes, the ion-exchange polymer matrix film and the polymer surface and is a three-layer sandwich structure. The conductive composite material has the advantages of flexibility, portability, and biocompatibility, which has attracted a large number of researchers to study it in the fields of biomimetic flexible actuators and biomedical materials, but the conventional matrix film has the disadvantage of high preparation cost. In this study, using sulfonated waterborne polyurethane membrane as matrix membrane and aniline as monomer, polyaniline (PANI) was synthesized by in situ oxidation polymerization reaction, and the conductive composites with PANI as electrode were prepared. After applying alternating current electric field, a new brake with PANI as electrode is obtained. A low-frequency signal generator was used to study the electromechanical properties of the prepared materials. The results show that the waterborne polyurethane/PANI composite film produces a continuous and stable driving performance at 0.2 Hz and 20 V, and the maximum output displacement of the terminal is 40 mm. When the driving voltage and frequency are changed, the displacement output also changes, showing a good controllable performance. Its structure and morphology were characterized.
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Liu, Zongxu, Wei Guo, Wenyan Wang, Zijian Guo, Laifeng Yao, Ying Xue, Qing Liu et Qiuyu Zhang. « Healable Strain Sensor Based on Tough and Eco-Friendly Biomimetic Supramolecular Waterborne Polyurethane ». ACS Applied Materials & ; Interfaces 14, no 4 (21 janvier 2022) : 6016–27. http://dx.doi.org/10.1021/acsami.1c21987.

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Si, Junhui, Jianhua Ye, Pengfei Chen, Song Chen, Zhixiang Cui et Qiangting Wang. « Biomimetic Hydroxyapatite Mineralization on the Thermoplastic Polyurethane Fibrous Scaffold Modified with Cellulose Nanocrystal ». Journal of Biobased Materials and Bioenergy 12, no 4 (1 août 2018) : 387–91. http://dx.doi.org/10.1166/jbmb.2018.1787.

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Machado, Irlaine, Isabel Hsieh, Veronica Calado, Thomas Chapin et Hatsuo Ishida. « Nacre-Mimetic Green Flame Retardant : Ultra-High Nanofiller Content, Thin Nanocomposite as an Effective Flame Retardant ». Polymers 12, no 10 (14 octobre 2020) : 2351. http://dx.doi.org/10.3390/polym12102351.

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A nacre-mimetic brick-and-mortar structure was used to develop a new flame-retardant technology. A second biomimetic approach was utilized to develop a non-flammable elastomeric benzoxazine for use as a polymer matrix that effectively adheres to the hydrophilic laponite nanofiller. A combination of laponite and benzoxazine is used to apply an ultra-high nanofiller content, thin nanocomposite coating on a polyurethane foam. The technology used is made environmentally friendly by eliminating the need to add any undesirable flame retardants, such as phosphorus additives or halogenated compounds. The very-thin coating on the polyurethane foam (PUF) is obtained through a single dip-coating. The structure of the polymer has been confirmed by proton nuclear magnetic resonance spectroscopy (1H NMR) and Fourier transform infrared spectroscopy (FTIR). The flammability of the polymer and nanocomposite was evaluated by heat release capacity using microscale combustion calorimetry (MCC). A material with heat release capacity (HRC) lower than 100 J/Kg is considered non-ignitable. The nanocomposite developed exhibits HRC of 22 J/Kg, which is well within the classification of a non-ignitable material. The cone calorimeter test was also used to investigate the flame retardancy of the nanocomposite’s thin film on polyurethane foam. This test confirms that the second peak of the heat release rate (HRR) decreased 62% or completely disappeared for the coated PUF with different loadings. Compression tests show an increase in the modulus of the PUF by 88% for the 4 wt% coating concentration. Upon repeated modulus tests, the rigidity decreases, approaching the modulus of the uncoated PUF. However, the effect of this repeated mechanical loading does not significantly affect the flame retarding performance.
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Wang, He Yun, Ya Kai Feng, Hai Yang Zhao, Ruo Fang Xiao et Jin Tang Guo. « Biomimetic Hemocompatible Nanofibrous Scaffolds as Potential Small-Diameter Blood Vessels by Bilayering Electrospun Technique ». Advanced Materials Research 306-307 (août 2011) : 1627–30. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.1627.

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In this paper, we prepared a scaffold composed of a polyurethane (PU) fibrous outside-layer and a gelatin-heparin fibrous inner-layer with mimicking morphology and mechanical properties of a native blood vessel by sequential bilayering electrospinning technology on a rotating mandrel-type collector. The scaffolds achieved the appropriate breaking strength (3.7 ± 0.13 MPa) and elongation at break (110 ± 8%). When the scaffolds were immersed in water for 1 h, the breaking strength decreased slightly to 2.2 ± 0.3 MPa, but the elongation at break increased up to 145 ± 21%. Heparin was released from the scaffolds at substantially uniform rate until the 9th day. The scaffolds were expected to mimic the complex matrix structure of native arteries, and had good hemocompatibility as an artificial blood vessel owing to the heparin release.
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Geary, C., E. Jones, D. Fitzpatrick, C. P. Kelly et C. Birkinshaw. « In-vitro evaluation of a polyurethane compliant-layer glenoid for use in shoulder arthroplasty ». Proceedings of the Institution of Mechanical Engineers, Part H : Journal of Engineering in Medicine 224, no 4 (13 novembre 2009) : 551–63. http://dx.doi.org/10.1243/09544119jeim626.

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A polyurethane glenoid component has been designed and manufactured as part of a total shoulder arthroplasty (TSA) system based on compliant-layer (CL) technology. Compared with conventional TSA designs, this biomimetic approach offers reduced friction and wear and potentially improved longevity. In-vitro evaluation of the glenoid system has included loosening and stability tests, and wear measurement using a specially constructed wear simulator. The results obtained support the hypothesis that a CL glenoid design may provide improved resistance to dynamic loosening and rim erosion, and demonstrate superior wear performance over a standard ultra-high molecular weight polyethylene design. This study not only confirms the feasibility of a CL glenoid component but also highlights the potential to increase implant longevity, thereby allowing earlier surgical intervention before poor glenoid bone stock and soft tissue compromise the outcome of TSA.
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Zhu, Qingxia, Xiaofei Li, Zhaobo Fan, Yanyi Xu, Hong Niu, Chao Li, Yu Dang, Zheng Huang, Yun Wang et Jianjun Guan. « Biomimetic polyurethane/TiO2 nanocomposite scaffolds capable of promoting biomineralization and mesenchymal stem cell proliferation ». Materials Science and Engineering : C 85 (avril 2018) : 79–87. http://dx.doi.org/10.1016/j.msec.2017.12.008.

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Jaganathan, Saravana Kumar, Mohan Prasath Mani, Manikandan Ayyar et Rajasekar Rathanasamy. « Biomimetic electrospun polyurethane matrix composites with tailor made properties for bone tissue engineering scaffolds ». Polymer Testing 78 (septembre 2019) : 105955. http://dx.doi.org/10.1016/j.polymertesting.2019.105955.

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Wang, Shan, et Min-yan Zheng. « Biomimetic Method Synthesis of HgS/Polyurethane Composite Film and Its Sensing Properties to Ba2+ ». Chinese Journal of Chemical Physics 28, no 3 (27 juin 2015) : 370–74. http://dx.doi.org/10.1063/1674-0068/28/cjcp1501002.

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Silvestri, Antonella, Susanna Sartori, Monica Boffito, Clara Mattu, Anna M. Di Rienzo, Francesca Boccafoschi et Gianluca Ciardelli. « Biomimetic myocardial patches fabricated with poly(ɛ-caprolactone) and polyethylene glycol-based polyurethanes ». Journal of Biomedical Materials Research Part B : Applied Biomaterials 102, no 5 (5 décembre 2013) : 1002–13. http://dx.doi.org/10.1002/jbm.b.33081.

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Li, Peichuang, Wanhao Cai, Xin Li, Kebing Wang, Lei Zhou, Tianxue You, Rui Wang et al. « Preparation of phospholipid-based polycarbonate urethanes for potential applications of blood-contacting implants ». Regenerative Biomaterials 7, no 5 (6 septembre 2020) : 491–504. http://dx.doi.org/10.1093/rb/rbaa037.

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Abstract Polyurethanes are widely used in interventional devices due to the excellent physicochemical property. However, non-specific adhesion and severe inflammatory response of ordinary polyurethanes may lead to severe complications of intravenous devices. Herein, a novel phospholipid-based polycarbonate urethanes (PCUs) were developed via two-step solution polymerization by direct synthesis based on functional raw materials. Furthermore, PCUs were coated on biomedical metal sheets to construct biomimetic anti-fouling surface. The results of stress–strain curves exhibited excellent tensile properties of PCUs films. Differential scanning calorimetry results indicated that the microphase separation of such PCUs polymers could be well regulated by adjusting the formulation of chain extender, leading to different biological response. In vitro blood compatibility tests including bovine serum albumin adsorption, fibrinogen adsorption and denaturation, platelet adhesion and whole-blood experiment showed superior performance in inhibition non-specific adhesion of PCUs samples. Endothelial cells and smooth muscle cells culture tests further revealed a good anti-cell adhesion ability. Finally, animal experiments including ex vivo blood circulation and subcutaneous inflammation animal experiments indicated a strong ability in anti-thrombosis and histocompatibility. These results high light the strong anti-adhesion property of phospholipid-based PCUs films, which may be applied to the blood-contacting implants such as intravenous catheter or antithrombotic surface in the future.
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Siroros, Nad, Yu Liu, Sophie Lecouturier, Markus Tingart et Jörg Eschweiler. « A pilot study : development of bonepreserving- biomimetic artificial femoral head cover ». Current Directions in Biomedical Engineering 6, no 3 (1 septembre 2020) : 225–28. http://dx.doi.org/10.1515/cdbme-2020-3057.

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AbstractPatients with hip arthrosis are increasing each year where total hip replacement is an effective solution when other non-invasive or surgical methods are no longer an effective solution. A pilot study of a new bone-preserving-biomimetic artificial femoral head cover was initiated. The purpose of the new implant is to be an alternative to the current hip arthroplasties. A special polyurethane (PU) femoral head cover was mechanically tested. Experiments were performed to investigate the implants mechanical behaviour and response to tensile load and study on the locking mechanism design concept of the prosthesis. The femoral head cover had a 45 mm outer diameter. Two suture techniques were selected to represent possible locking mechanisms. The experiment consisted of five cyclic loadings followed by a pull-to-failure test. The results show that each specimen has a consistency response and different suture technique results in a different outcome. This experiment intended to study the response of specimens as a whole part, not the material itself. Factors are influencing the outcome such as the femoral head cover positioning and suture rupture pattern. From this pilot study, some points need to be further considered. The information obtained in this experiment would influence further development achieving towards the goal of this alternative hip arthrosis treatment.
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Amna, Touseef, Mallick Shamshi Hassan, Mohamed H. El-Newehy, Tariq Alghamdi, Meera Moydeen Abdulhameed et Myung-Seob Khil. « Biocompatibility Computation of Muscle Cells on Polyhedral Oligomeric Silsesquioxane-Grafted Polyurethane Nanomatrix ». Nanomaterials 11, no 11 (5 novembre 2021) : 2966. http://dx.doi.org/10.3390/nano11112966.

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This study was performed to appraise the biocompatibility of polyhedral oligomeric silsesquioxane (POSS)-grafted polyurethane (PU) nanocomposites as potential materials for muscle tissue renewal. POSS nanoparticles demonstrate effectual nucleation and cause noteworthy enhancement in mechanical and thermal steadiness as well as biocompatibility of resultant composites. Electrospun, well-aligned, POSS-grafted PU nanofibers were prepared. Physicochemical investigation was conducted using several experimental techniques, including scanning electron microscopy, energy dispersive X-ray spectroscopy, electron probe microanalysis, Fourier transform infrared spectroscopy, and X-ray diffraction pattern. Adding POSS molecules to PU did not influence the processability and morphology of the nanocomposite; however, we observed an obvious mean reduction in fiber diameter, which amplified specific areas of the POSS-grafted PU. Prospective biomedical uses of nanocomposite were also appraised for myoblast cell differentiation in vitro. Little is known about C2C12 cellular responses to PU, and there is no information regarding their interaction with POSS-grafted PU. The antimicrobial potential, anchorage, proliferation, communication, and differentiation of C2C12 on PU and POSS-grafted PU were investigated in this study. In conclusion, preliminary nanocomposites depicted superior cell adhesion due to the elevated free energy of POSS molecules and anti-inflammatory potential. These nanofibers were non-hazardous, and, as such, biomimetic scaffolds show high potential for cellular studies and muscle regeneration.
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Davoudi, Parivash, Shiva Assadpour, Mohammad Ali Derakhshan, Jafar Ai, Atefeh Solouk et Hossein Ghanbari. « Biomimetic modification of polyurethane-based nanofibrous vascular grafts : A promising approach towards stable endothelial lining ». Materials Science and Engineering : C 80 (novembre 2017) : 213–21. http://dx.doi.org/10.1016/j.msec.2017.05.140.

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Yu, Emily, Hao-Yang Mi, Jue Zhang, James A. Thomson et Lih-Sheng Turng. « Development of biomimetic thermoplastic polyurethane/fibroin small-diameter vascular grafts via a novel electrospinning approach ». Journal of Biomedical Materials Research Part A 106, no 4 (5 décembre 2017) : 985–96. http://dx.doi.org/10.1002/jbm.a.36297.

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Tondnevis, Farbod, Mohammad Ali Ketabi, Reza Fekrazad, Ali Sadeghi, Hamid Keshvari et Mohammad Mahdi Abolhasani. « In Vitro Characterization of Polyurethane-Carbon Nanotube Drug Eluting Composite Scaffold for Dental Tissue Engineering Application ». Journal of Biomimetics, Biomaterials and Biomedical Engineering 47 (novembre 2020) : 13–24. http://dx.doi.org/10.4028/www.scientific.net/jbbbe.47.13.

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Tooth loss due to periodontal disease, dental caries, trauma or a variety of genetic disorders causes an adverse inability in adult’s lives. It is proved that biodegradable composite scaffolds in dental tissue engineering could play crucial role. To inhibit bacterial colonization in dental structure noticeable research concerning the drug delivery approach has been administrated. Nanostructures retain and release drug molecules more efficiently and continuously than other microstructure. In the present research, composite electrospun nanofibers of polyurethane-Single-walled carbon nanotube (SWNT) by the different mass ratios of metronidazole benzoate were prepared. Physico-chemical characterization of scaffolds including Scanning electron microscopy (SEM), uniaxial tensile testing and Ultraviolet-Visible (UV-Vis) spectroscopy analysis was operated. Culture of dental pulp stem cells (DPSCs) to evaluate cells behavior was carried out. The role of nanofiber diameters and drug content on releasing profile of the scaffolds was investigated. The median diameter of the nanofibrous scaffold was reduced from 330 ± 4 to 120 ± 4 nm. Ultimate stress and Young modulus of the scaffolds by enhancement of drug content increased from 0.28 ± 0.05 up to the 1.8 ± 0.05 MPa and 0.87 ± 0.05 up to the 4.4 ± 0.05 Mpa respectively. According to the result, prolonged and continuous releasing profile of the drug molecules was achieved. As the content of the drug increased, the drug was released continuously. It means that two parameters of fiber's diameter and drug ratio affected the releasing behavior of composite structures. Polyurethane-SWNT scaffolds contained metronidazole benzoate presented appropriate support of DPSCs adhesion and proliferation and biomimetic architecture like the structure of dental ECM.
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Migliardini, Fortunato, Viviana De Luca, Vincenzo Carginale, Mosè Rossi, Pasquale Corbo, Claudiu T. Supuran et Clemente Capasso. « Biomimetic CO2 capture using a highly thermostable bacterial α-carbonic anhydrase immobilized on a polyurethane foam ». Journal of Enzyme Inhibition and Medicinal Chemistry 29, no 1 (15 février 2013) : 146–50. http://dx.doi.org/10.3109/14756366.2012.761608.

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Liu, Yibin, Shan Gao, Jin Liu et Qiuyu Zhang. « Biomimetic slippery liquid-infused porous surfaces fabricated by porous fluorinated polyurethane films for anti-icing property ». Progress in Organic Coatings 179 (juin 2023) : 107524. http://dx.doi.org/10.1016/j.porgcoat.2023.107524.

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Dicker, Michael PM, Ian P. Bond, Jonathan M. Rossiter, Charl FJ Faul et Paul M. Weaver. « Modelling and Analysis of pH Responsive Hydrogels for the Development of Biomimetic Photo-Actuating Structures ». MRS Proceedings 1718 (2015) : 65–70. http://dx.doi.org/10.1557/opl.2015.20.

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ABSTRACTPhoto-actuating structures inspired by the chemical sensing and signal transmission observed in sun-tracking leaves have recently been proposed by Dicker et al. The proposed light tracking structures are complex, multicomponent material systems, principally composed of a reversible photoacid or base, combined with a pH responsive hydrogel actuator. New modelling and characterization approaches for pH responsive hydrogels are presented in order to facilitate the development of the proposed structures. The model employs Donnan equilibrium for the prediction of hydrogel swelling in systems where the pH change is a variable resulting from the equilibrium interaction of all free and fixed (hydrogel) species. The model allows for the fast analysis of a variety of combinations of material parameters, allowing for the design space for the proposed photo-actuating structures to be quickly established. In addition, experimental examination of the swelling of a polyether-based polyurethane and poly(acrylic acid) interpenetrating network hydrogel is presented. The experiment involves simultaneously performing a titration of the hydrogel, and undertaking digital image correlation (DIC) to determine the hydrogel’s state of swelling. DIC allows for the recording of the hydrogel’s state of swelling with previously unattained levels of resolution. Experimental results provide both model material properties, and a means for model validation.
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Ahmed, Mahmoud M. M., Yu-Ting Chi, Yu-Han Hung, Leitara Marren C. Reyes et Jui-Ming Yeh. « UV-cured electroactive polyurethane acrylate coatings with superhydrophobic surface structure of biomimetic peacock feather for anticorrosion application ». Progress in Organic Coatings 165 (avril 2022) : 106679. http://dx.doi.org/10.1016/j.porgcoat.2021.106679.

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