环境敏感型JANUS粒子的制备及自驱动马达的构建
发布时间：2019-02-19 18:51
【摘要】：Janus粒子由于其具有物理或化学不对称的特点,物理形态上例如雪人状、蘑菇状Janus粒子,化学性质例如粒子的表面亲疏水性,近年来环境敏感型Janus粒子受到各科研工作者广泛关注。Janus粒子的制备方法有很多,其中Pickering乳液法由于其操作简便、能大量制备,后处理简单的特点被大量使用在科研实验中。本研究利用Pickering乳液法制备了半草莓型SiO2 Janus粒子。其原理是利用氨基修饰的大粒径SiO2微球稳定石蜡-水乳液,石蜡冷却后SiO2微球部分嵌在石蜡里,通过酰胺反应对SiO2表面进行亲疏水不对称改性,洗脱下来后与环氧修饰的小粒径Si02微球与Fe3O4@SiO2微球通过氨基与环氧基自组装得到半草莓型Janus粒子。其中Si02微球、Fe3O4与Fe3O4@SiO2为球形,且粒径大小均匀,SiO2微球粒径随氨水量的增加而增加;Fe3O4的形态可由油酸钠调控;Fe3O4@SiO2的粒径可以通过调节TEOS来调控;由于Fe3O4单位质量含量减少与SiO2包覆层的屏蔽作用,与Fe3O4的磁饱和强度相比,Fe3O4@SiO2与Janus粒子都有大幅度下降。通过XPS证实了 Janus粒子的形成作用为氨基与环氧基自组装。为了构建自驱动马达,本研究结合物理溅镀法与化学聚合法,制备了既有催化作用又有温敏特性的P(MAA-co-DVB)@Pt@PNIPAM Janus粒子。将Janus粒子与H2O2溶液一起构建自驱动马达,Janus粒子在25℃下的运动速率明显高于40℃下的运动速率;Janus粒子在30%H2O2溶液中的运动速率是10%H2O2溶液中的6倍。
[Abstract]:Janus particles are characterized by physical or chemical asymmetries, such as snowman, mushroom Janus, and chemical properties such as surface hydrophobicity. In recent years, environment-sensitive Janus particles have been widely concerned by researchers. There are many methods for the preparation of Janus particles, among which Pickering emulsion method is widely used in scientific research experiments because of its simple operation and large amount of preparation. In this study, half strawberry SiO2 Janus particles were prepared by Pickering emulsion method. The principle is to stabilize the paraffin-water emulsion with large diameter SiO2 microspheres modified by amino groups. The SiO2 microspheres are partially embedded in paraffin after paraffin wax cooling, and the hydrophilic asymmetric modification of SiO2 surface is carried out by amide reaction. After elution, small diameter Si02 microspheres and Fe3O4@SiO2 microspheres modified with epoxy were prepared by amino and epoxide self-assembly to obtain semi-strawberry Janus particles. Among them, Si02 microspheres, Fe3O4 and Fe3O4@SiO2 were spherical, and the size of SiO2 microspheres was uniform. The size of SiO2 microspheres increased with the increase of ammonia water content, the morphology of Fe3O4 was regulated by sodium oleate, the particle size of Fe3O4@SiO2 could be regulated by adjusting TEOS. Due to the decrease of Fe3O4 unit mass content and the shielding effect of SiO2 cladding, both Fe3O4@SiO2 and Janus particles have a significant decrease compared with the magnetic saturation intensity of Fe3O4. The formation of Janus particles was confirmed by XPS as self-assembly of amino and epoxy groups. In order to construct a self-driving motor, P (MAA-co-DVB) @ Pt@PNIPAM Janus particles with both catalytic and temperature-sensitive properties were prepared by physical splashing and chemical polymerization. The self-driving motor was constructed by combining Janus particles with H2O2 solution. The moving rate of Janus particles at 25 鈩，
本文编号：2426763
[Abstract]:Janus particles are characterized by physical or chemical asymmetries, such as snowman, mushroom Janus, and chemical properties such as surface hydrophobicity. In recent years, environment-sensitive Janus particles have been widely concerned by researchers. There are many methods for the preparation of Janus particles, among which Pickering emulsion method is widely used in scientific research experiments because of its simple operation and large amount of preparation. In this study, half strawberry SiO2 Janus particles were prepared by Pickering emulsion method. The principle is to stabilize the paraffin-water emulsion with large diameter SiO2 microspheres modified by amino groups. The SiO2 microspheres are partially embedded in paraffin after paraffin wax cooling, and the hydrophilic asymmetric modification of SiO2 surface is carried out by amide reaction. After elution, small diameter Si02 microspheres and Fe3O4@SiO2 microspheres modified with epoxy were prepared by amino and epoxide self-assembly to obtain semi-strawberry Janus particles. Among them, Si02 microspheres, Fe3O4 and Fe3O4@SiO2 were spherical, and the size of SiO2 microspheres was uniform. The size of SiO2 microspheres increased with the increase of ammonia water content, the morphology of Fe3O4 was regulated by sodium oleate, the particle size of Fe3O4@SiO2 could be regulated by adjusting TEOS. Due to the decrease of Fe3O4 unit mass content and the shielding effect of SiO2 cladding, both Fe3O4@SiO2 and Janus particles have a significant decrease compared with the magnetic saturation intensity of Fe3O4. The formation of Janus particles was confirmed by XPS as self-assembly of amino and epoxy groups. In order to construct a self-driving motor, P (MAA-co-DVB) @ Pt@PNIPAM Janus particles with both catalytic and temperature-sensitive properties were prepared by physical splashing and chemical polymerization. The self-driving motor was constructed by combining Janus particles with H2O2 solution. The moving rate of Janus particles at 25 鈩，
本文编号：2426763
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