環(huán)境敏感型JANUS粒子的制備及自驅動馬達的構建
發(fā)布時間：2019-02-19 18:51
【摘要】：Janus粒子由于其具有物理或化學不對稱的特點,物理形態(tài)上例如雪人狀、蘑菇狀Janus粒子,化學性質例如粒子的表面親疏水性,近年來環(huán)境敏感型Janus粒子受到各科研工作者廣泛關注。Janus粒子的制備方法有很多,其中Pickering乳液法由于其操作簡便、能大量制備,后處理簡單的特點被大量使用在科研實驗中。本研究利用Pickering乳液法制備了半草莓型SiO2 Janus粒子。其原理是利用氨基修飾的大粒徑SiO2微球穩(wěn)定石蠟-水乳液,石蠟冷卻后SiO2微球部分嵌在石蠟里,通過酰胺反應對SiO2表面進行親疏水不對稱改性,洗脫下來后與環(huán)氧修飾的小粒徑Si02微球與Fe3O4@SiO2微球通過氨基與環(huán)氧基自組裝得到半草莓型Janus粒子。其中Si02微球、Fe3O4與Fe3O4@SiO2為球形,且粒徑大小均勻,SiO2微球粒徑隨氨水量的增加而增加;Fe3O4的形態(tài)可由油酸鈉調控;Fe3O4@SiO2的粒徑可以通過調節(jié)TEOS來調控;由于Fe3O4單位質量含量減少與SiO2包覆層的屏蔽作用,與Fe3O4的磁飽和強度相比,Fe3O4@SiO2與Janus粒子都有大幅度下降。通過XPS證實了 Janus粒子的形成作用為氨基與環(huán)氧基自組裝。為了構建自驅動馬達,本研究結合物理濺鍍法與化學聚合法,制備了既有催化作用又有溫敏特性的P(MAA-co-DVB)@Pt@PNIPAM Janus粒子。將Janus粒子與H2O2溶液一起構建自驅動馬達,Janus粒子在25℃下的運動速率明顯高于40℃下的運動速率;Janus粒子在30%H2O2溶液中的運動速率是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，
本文編號：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，
本文編號：2426763
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