共查询到18条相似文献,搜索用时 78 毫秒
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将聚丙烯酸钠引入纳米Fe3O4/γ-甲基丙烯酰氧基丙基三甲氧基硅烷(TPM)/聚丙烯酰胺(PAM)磁性复合水凝胶体系中,制备了互穿聚合物网络(IPN)超强磁性水凝胶。采用透射电镜(TEM)、激光粒度分析仪、扫描电镜(SEM)、压缩试验机和样品振动磁强计对Fe3O4纳米粒子的粒径、Pickering乳液的结构及水凝胶的结构与性能进行了测试与表征。结果表明,IPN改性水凝胶在保持原复合水凝胶优异性能的基础上,其断面结构比未改性的更为规整,水凝胶的内部缺陷减少;改性水凝胶的抗压强度可达2.8MPa以上,远高于未改性水凝胶的强度;改性水凝胶需要约50min达溶胀平衡,平衡时的溶胀率为24.9;改性后的水凝胶中Fe3O4纳米粒子的磁性并未受到影响。 相似文献
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聚合物水凝胶研究进展 总被引:6,自引:0,他引:6
赵青春 《高分子材料科学与工程》2005,21(2):28-32
对近十几年来聚合物水凝胶的制备、凝胶网络结构、特性以及水凝胶在工业、农业和科学研究等方面的应用作了比较全面的综述. 相似文献
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白靖琨 《材料科学与工程学报》2017,35(4)
本文简要介绍了环境响应型水凝胶的研究现状,重点分析了酶响应水凝胶,包括谷氨酰胺转氨酶、激酶与磷酸酶、酪氨酸酶、枯草杆菌蛋白酶与嗜热菌蛋白酶、过氧化物酶、酯酶与核酸内切酶等引起水凝胶响应的酶因素,并介绍了酶响应引起自组装的形成、自组装的破坏以及动态自组装等材料响应。此外,分析了酶响应水凝胶研究中存在的问题,并介绍了肽水凝胶的生物学功能。 相似文献
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Yalan Zhang Yu Wang Huan Wang Ying Yu Qifeng Zhong Yuanjin Zhao 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(35)
Structural color hydrogels are promising candidates as scaffold materials for tissue engineering and for matrix cell culture and manipulation, while their super‐elastic features are still lacking due to the irreconcilable interfere of the precursor and the self‐assembly unit. This hinders many of their practical biomedical applications where elasticity is required. Herein, hydrophilic and size‐controllable Fe3O4@poly(4‐styrenesulfonic acid‐co‐maleic acid) (PSSMA)@SiO2 magnetic response photonic crystals are fabricated as the assembly units of the structural color hydrogels by orderly packing of core–shell colloidal nanocrystal clusters via a two‐step facile synthesis approach. These units are capable of responding instantaneously to an external magnetic field with resistance to interference of ions, thus, by integrating super‐elastic hydrogels, super‐elastic magnetic structural color hydrogels can be achieved. The structural color arises from the dynamic ordering of the magnetic nanoparticles through the contactless control of external magnetic field, allowing regional polymerization of hydrogels via changing orientation and strength of external magnetic field. These regionally polymerized super‐elastic magnetic structural color hydrogels can work as anti‐counterfeiting labels with super‐elastic identification, which may be widely used in the future. 相似文献
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热疗用磁性材料研究进展 总被引:1,自引:0,他引:1
在介绍热疗用磁性材料研究概况的基础上,对其研究进展进行了详细综述,重点介绍了Fe3O4和γ-Fe2O3两类材料的制备方法、产热能力研究以及动物实验等方面的内容,最后对热疗用磁性材料的发展前景进行了展望. 相似文献
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块体纳米磁性材料研究进展 总被引:5,自引:1,他引:4
介绍了块体纳米磁性材料的形成机理以及制备方法与工艺,分别对软磁和永磁两体系中纳米磁性材料与传统磁性材料的磁性能进行了对比,并介绍了最新的几种纳米磁性材料体系。 相似文献
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磁性高分子微球研究进展 总被引:12,自引:1,他引:12
对磁性高分子微球的研究进展进行了综述,介绍了各类微球的制备方法及相关原理。在此基础上,概述了磁性高分子微球在磁性塑料、固定化酶、细胞分离和靶向药物等领域的应用情况,并对磁性高分子微球的未来研究方向进行了展望。 相似文献
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本文简述了磁制冷的基本原理,分析磁制冷工质的熵特性,总结了近几年磁制冷材料的最新进展,对磁制冷材料未来的发展进行了展望。 相似文献
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磁制冷材料中一级磁相变的研究进展 总被引:1,自引:0,他引:1
磁制冷技术作为21世纪的新一代制冷技术已经受到了关注。因此近年来具有一级磁相变的磁制冷材料成为全球学术界的一个研究热点,并越来越受到工业界的重视。主要介绍了磁制冷材料中的一级磁相变特点,综述了具有一级磁相变的磁制冷材料的研究进展和应用现状。最后展望了具有一级磁相变的磁制冷材料的发展趋势。 相似文献
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Roland Fuhrer Evagelos Kimon Athanassiou Norman Albert Luechinger Wendelin Jan Stark 《Small (Weinheim an der Bergstrasse, Germany)》2009,5(3):383-388
The combination of force and flexibility is at the core of biomechanics and enables virtually all body movements in living organisms. In sharp contrast, presently used machines are based on rigid, linear (cylinders) or circular (rotator in an electrical engine) geometries. As a potential bioinspired alternative, magnetic elastomers can be realized through dispersion of micro‐ or nanoparticles in polymer matrices and have attracted significant interest as soft actuators in artificial organs, implants, and devices for controlled drug delivery. At present, magnetic particle loss and limited actuator strength have restricted the use of such materials to niche applications. We describe the direct incorporation of metal nanoparticles into the backbone of a hydrogel and application as an ultra‐flexible, yet strong magnetic actuator. Covalent bonding of the particles prevents metal loss or leaching. Since metals have a far higher saturation magnetization and higher density than oxides, the resulting increased force/volume ratio afforded significantly stronger magnetic actuators with high mechanical stability, elasticity, and shape memory effect. 相似文献