Preparation method for multi-element heterogeneous asymmetric particles

An asymmetric and particle technology, applied in the field of material science, can solve the problems of limited characteristic area, difficult to meet the needs, multiple asymmetric particles or the modified area is not stable enough, etc., to achieve the effect of good stability and simple operation.

Inactive Publication Date: 2012-07-04
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the characteristic area it provides is limited, and it is difficult to meet the needs, and the multi-element asymmetric particles can make up for this defect, among which the ternary asymmetric particles are the most basic
At present, there are few methods that can realize the preparation of multi-component asymmetric particles, and many of the obtained asymmetric particles do not belong to multi-components in the strict sense or the modified regions are not stable enough (Kaufmann, T.; Gokmen, M.T.; Wendeln, C.; et al. ; "Sandwich" Microcontact Printing as a Mild Route Towards Monodisperse Janus Particles with Tailored Bifunctionality, Adv. Mater. 2011, 23, 79)

Method used

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  • Preparation method for multi-element heterogeneous asymmetric particles
  • Preparation method for multi-element heterogeneous asymmetric particles
  • Preparation method for multi-element heterogeneous asymmetric particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Preparation of Hydrophobic Silica Colloidal Microparticles

[0039] At room temperature, 10 mL of an aqueous dispersion of 5 wt % silica colloidal particles (purchased from Fluka) with a diameter of 2 μm was centrifuged to remove water. After that, wash twice with ethanol and disperse in ethanol, and dissolve 100uL octadecyltrichlorosilane in toluene at the same time, then mix the two, stir magnetically for 8 hours, centrifuge and wash the precipitate twice with ethanol, and finally obtain Hydrophobic silica colloidal particles were dispersed in 10 mL of ethanol to obtain 5 wt % hydrophobic silica colloidal particles with a diameter of 2 μm.

Embodiment 2

[0040] Example 2: Modification of functional groups on the surface of silica colloidal particles

[0041] Use a disposable syringe to draw 0.2mL of hydrophobic silica colloid particles with a diameter of 2um prepared in Example 1, and slowly add them dropwise to a watch glass filled with water at a uniform speed. Adding 50 μL of 10 wt% sodium dodecylsulfonate aqueous solution, the colloidal silica particles will form a monolayer of hexagonal close arrangement. Put the clean silicon wafer treated with an oxidant with a volume ratio of concentrated sulfuric acid and hydrogen peroxide of 7:3 into the liquid surface, lift it up at an inclination of 45°C, and finally place the lifted silicon wafer on a 30° slope. After natural drying, a two-dimensional ordered silicon dioxide monolayer particle array is obtained.

[0042] 200 μL of polystyrene toluene solution with a concentration of 30 mg / mL was dropped onto the silicon wafer covered with a single layer of silica colloidal microp...

Embodiment 3

[0044] Example 3: Fluorescent modification of specific regions on the surface of silica colloidal particles

[0045] Dilute 15mL to a concentration of 10 -3 The mercaptopropionic acid of mol / L is the CdTe (the particle diameter of CdTe is 4.0nm) solution of ligand with Na 2 HPO 4 and NaH 2 PO 4 The buffer solution is adjusted to a pH value of 7.4, and then 0.002g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 0.002g of N-hydroxysuccinimide are added. After stirring and fully dissolving, the silicon wafer with the silica colloidal microparticle array modified by the surface amino functionalization obtained in the above steps was added into the reactor, and the reaction was carried out under magnetic stirring at room temperature for 5 hours. After the reaction, the silicon wafer was rinsed with a large amount of water, blown dry with nitrogen, and then drip-coated 100mg / mL PS toluene solution on its surface. After drying, the polymer film containing the s...

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Abstract

The invention belongs to the field of material science and specifically relates to a preparation method for multi-element heterogeneous asymmetric particles. A polymer mask layer, such as polystyrene, is prepared according to a spinning and dropping coating method; repeated plasma etching and functional decorating are utilized to decorate different areas on the surfaces of silicon dioxide particles with different fluorescent quantum dots or metal nanometer particles, so that the multi-element asymmetric particles are obtained; the size of the decorated areas is controllable; no complex operation is adopted in the whole process; the expensive or difficultly obtained reagent is unnecessary; and the obtained asymmetric particles are high in stability. Meanwhile, polymers, such as the polystyrene, are taken as the mask layer, and the physical controllable deposition and the chemical deposition reaction are combined and utilized to obtain the multi-element asymmetric particles with gold on one side, silver in the middle and silicon dioxide in the other areas. The multi-element asymmetric particles prepared according to the method provided by the invention have significance in both scientific research and practical application.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a preparation method of multiple heterogeneous asymmetric particles. Background technique [0002] The preparation and application research of asymmetric particles has become an independent and important branch in the field of material science. Due to their unique structure, asymmetric particles have a wide range of applications in many fields, such as self-assembly of advanced structures (Perro, A.; Reculusa, S.; Ravaine, S.; et al.; J. Mater. Chem. 2005, 15, 3745), biological and chemical sensors (Kim, S.-H.; Jeon, S.-J.; Jeong, W.C.; et al.; Adv.Mater.2008, 20, 4129), for detecting and therapeutic anisotropic imaging probes (Yoshida, M.; Roh, K.-H.; Lahann, J.; Biomaterials 2007, 28, 2446) and control of cell adhesion (Yoshida, M.; Roh, K-H. ; Mandal, S.; et al.; Adv. Mater. 2009, 21, 4920) and so on. In the past few years, people have mainly focused on the prepa...

Claims

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Application Information

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IPC IPC(8): B01J13/02
Inventor 张刚石增敏赵志远陈俊波于也
Owner JILIN UNIV
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