共查询到19条相似文献,搜索用时 365 毫秒
1.
2.
3.
磁性复合微球处理水中氯仿的应用研究 总被引:1,自引:0,他引:1
采用磁性复合微球为吸附载体,将其应用于水体中氯仿的吸附研究,在此过程中以紫外吸光光度法就磁性复合微球粒径、表面性质对吸附性能的影响作了考察,最终选取粒径为1.5μm、表面富含胺基磁性的复合微球为最佳吸附材料。与此同时,利用CODCr法作为评价手段对磁性的复合微球吸附氯仿的处理工艺条件进行了优化,确定每处理质量浓度为74 mg/L的氯仿溶液2 mL需用磁性复合微球约1 mg,最佳吸附时间为4.0 h,磁性复合微球的富集时间为4.0 h,此时对氯仿的吸附效率大于83%。 相似文献
4.
5.
6.
7.
8.
9.
10.
11.
12.
磁性微球在生物医学领域的最新进展 总被引:10,自引:0,他引:10
磁性微球作为一种新型功能材料,在生物医学工程等领域有着广泛的应用前景。首先介绍磁性微球的几种制备方法,包括喷雾干燥、热处理等物理方法,以及乳液聚合、自组装等化学方法。同时着重阐述了磁性微球在固定化酶、靶向药物、细胞分离、诊断等生物医学领域的应用。 相似文献
13.
磁性中空微球在功能性吸附、酶固定化载体、物质的分离纯化、活性物质和药物的封装与控释、靶向给药、污染防治、食品和材料学等领域有突出的应用价值。文章综述了利用生物模板法制备磁性中空微球的制备原理和最新研究成果,并主要分析了软模板法和自模板法两种制备工艺。软模板法工艺主要通过吸附-高温炭化法除去生物模板材料获得固定外形的磁性中空微球。自模板法制备磁性中空微球可依据生物材料自身成分经水热碳化反应或在惰性气体氛围保护下的高温炭化反应生成具有特殊官能团结构的中空碳微球,并将磁性物质溶入或吸附到中空微球中,具体分为水热碳化法和浸渍-高温炭化法;也可将制备好的磁性物质吸附于经过特殊处理过的生物模板材料表面,如吸附-共沉淀法和高温炭化-共沉淀法。总之,生物模板法制备磁性中空微球条件较为温和、无污染,生物模板材料对人体无毒,特别适合于食品、医药等行业的应用,具有很好的生产应用前景。 相似文献
14.
以化学共沉淀法合成Fe3O4纳米粒子为磁核,采用乳化交联法制备磁性壳聚糖微球,并对其形貌、结构和磁饱和强度等性质进行了表征。以磁性壳聚糖微球作为载体,固定化猪肺粗提物中的血管紧张素转化酶,并对固定化条件进行研究。结果表明,固定化血管紧张素转化酶的最佳条件为:pH值为8.3,最佳温度为50 ℃,最佳时间为1.5 h,最佳酶溶液蛋白浓度为6 mg/mL,此时固定化酶活力最高为0.048 U/g微球。与游离酶相比,固定化酶的pH值稳定性和热稳定性均得到提高。固定化酶重复使用10次,仍然保持40%以上相对活力,说明磁性壳聚糖微球是固定化血管紧张素转化酶的良好载体。 相似文献
15.
Si/graphite composite materials embedded with polymer microsphere as an elastic inactive phase were prepared by high-energy mechanical milling and investigated as a high capacity anode material for lithium rechargeable battery. Improved capacity retention was achieved with the composite. In situ measurement of the electrode thickness revealed that the swelling of the electrode became smaller with the increase of polymer microsphere content. It is believed that polymer microsphere played a buffering role of accommodating the mechanical strains induced by silicon expansion during lithiation, resulting in the suppression of the volume expansion of the electrode, which improved the cycle performance of the electrode. 相似文献
16.
17.
Hepeng Zhang Qiuyu Zhang Baoliang Zhang Hailong Xu Xinlong Fan 《Polymer International》2012,61(6):990-993
Novel inner asymmetric composite microspheres were prepared by encapsulating surface‐modified magnetic particles via mini‐emulsion polymerization. Most of the surface‐modified magnetic particles encapsulated into the polymer matrix aggregate in one side of each microsphere, while only a few particles randomly disperse in the remaining part. The magnetic content of these novel asymmetric composite microspheres is 46.7% and the saturation magnetization is 23.8 emu g?1. Copyright © 2012 Society of Chemical Industry 相似文献
18.
采用微波辐射法制备了Fe3O4-聚苯乙烯复合磁性微球。通过Fe3O4磁流体的制备及改性,利用微波辐射使苯乙烯自聚反应能够在Fe3O4磁性颗粒表面顺利进行,最终得到复合磁性微球。实验考察了微波功率大小、聚合反应体系pH值、磁流体用量等反应条件的影响,通过红外谱图、热重谱图分析了产物的结构和热稳定性,利用沉降实验定性地表征了产物的磁响应性。结果表明:微波功率为130w时能迅速成功地制备出磁含量为24.47%的复合磁性微球。 相似文献
19.
Nicholas Vishnosky Jasmine C. Gomez Spencer T. Kim Emma J. Doukmak Jeremy Grafstein Rachel C. Steinhardt 《大分子材料与工程》2021,306(9):2100222
Actuators made of soft matter are needed for a variety of fields ranging from biomedical devices to soft robotics to microelectromechanical systems. While there are a variety of excellent methods of soft actuation known, the field is still an area of intense research activity as new niches and needs emerge with new technology development. Here, a soft actuation system is described, based on a core-multi-shell particle, which moves via photothermal expansion. The system consists of a novel polystyrene-based thermally expandable microsphere, with a secondary shell of a silicate-silane graft copolymer, to which gold nanoparticles are covalently linked. The gold nanoparticles act as photothermal nano-transducers, converting light energy into the thermal energy necessary for microsphere expansion, which in turn results in material movement. Actuation is shown in isolated particles in thermal and photothermal regimes using metal ceramic heaters or 520 nm laser illumination, respectively. Macroscale actuation is demonstrated by making a composite material of particles suspended in the transparent elastomer polydimethylsiloxane. The sample demonstrates an inchworm-like movement by starting from an arched geometry. Overall, this work describes a new particle-based actuation method for soft materials, and demonstrates its utility in driving the movement of a composite elastomer. 相似文献