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Controllable drop coalescence prepared anisotropic particle material and microfluid device

An anisotropic, droplet technology, applied in chemical/physical/physical-chemical processes, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as small particle size range and inability to modify the surface of solid particles

Inactive Publication Date: 2012-02-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main drawbacks of this technique are the small range of particle sizes obtained, all the patches are in contact with each other, and the inability to surface modify solid particles

Method used

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  • Controllable drop coalescence prepared anisotropic particle material and microfluid device
  • Controllable drop coalescence prepared anisotropic particle material and microfluid device
  • Controllable drop coalescence prepared anisotropic particle material and microfluid device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Spherical functional particle materials with partial properties ( figure 1 a). by figure 1 The three-color block particles in a are taken as an example: EGDMA is colored with inks of three colors, and then three T-shaped droplet generation modules are used to generate three EGDMA droplets with a diameter of 10 microns in light blue, black and red. Afterwards, these three droplets are respectively passed into the three inlets of the six-arm hydrodynamic well, allowing them to gather at the center of the hydrodynamic well ( Image 6 c), due to surface tension, these droplets will fuse into one large spherical droplet, but the colors will not mix very quickly, leaving a clear interface. Finally, the three-color EGDMA balls were cured with ultraviolet light to prepare three-color segmented spherical particles.

Embodiment 2

[0050] Colloidal cluster-like functional particle materials with a certain lattice structure ( figure 1 b). by figure 1 The three-spherical particle cluster in b is an example: after the EGDMA droplet (diameter 10 microns) is generated, it can be directly cured into spherical particles by ultraviolet light. Then three spherical particles are respectively passed into the three inlets of the six-arm hydrodynamic well, allowing them to gather and merge at the center of the hydrodynamic well ( Image 6 c). When the EGDMA droplets are fully solidified, they coalesce without deformation; while when the droplets are partially solidified before coalescence, they coalesce, they will partially deform under the action of the fluid, but will not fully fuse into a large sphere , and finally generate particle clusters.

Embodiment 3

[0052] Dendritic functional particle material with small branch structure ( figure 1 c). by figure 1 The first case in the c-column particles is an example: first, after the EGDMA droplet (40 microns in diameter) is generated, it is passed into the cross-shaped hydraulic well, placed on the stagnation point of the operation module, and it is transported by extensional flow. It is deformed into an ellipsoid, and then cured by ultraviolet light; secondly, a small droplet with a diameter of 10 microns is generated by the droplet generation module, and after being partially cured, it is passed into a cross-shaped hydraulic well to converge with the large ellipsoid already at the stagnation point. and( Image 6 b), thus generating small branches. If branch lengths are to be increased, multiple prepreg droplets can be coalesced sequentially at the same location.

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Abstract

The invention relates to a controllable drop coalescence prepared anisotropic particle material and a microfluid device. The particle material provided by the invention is prepared by the following steps: preparing liquid drop of a polymer monomer by the use of fluid shear force of a continuous phase in a liquid drop generation module; simultaneously preparing various desired liquid drops by the use of a plurality of liquid drop generation modules; allowing the liquid drops to simultaneously or successively enter into a hydraulic trap of a liquid drop operation module according to the requirement of the liquid drops and according to the position and direction of coalescence controlling for coalescence and photo polymerization, so as to prepare the anisotropy functional particle material. The liquid drop generation modules are connected with the liquid drop operation module through conduits; the liquid drop generation modules are formed by commonly-used microfluidic liquid drop generation chips; the liquid drop operation module is composed of a four-arm, six-arm or eight-arm hydraulic trap, and the dimension of micro channels in each module varies from several micrometers to hundreds of micrometers; coalescence between liquid drops and curing operation are carried out. The device provided by the invention is used to realize the preparation of the anisotropic particle material which has a plurality of forms and can be prepared only by the combination of many present prior arts.

Description

technical field [0001] The invention belongs to the technical field of microfluidic control of particle materials or photonic crystals; in particular, it relates to a microfluidic device for controllable coalescence of droplets and preparation of anisotropic particle materials. Background technique [0002] Functional materials are the core of the field of new materials and the foundation and guide of national economy, social development and national defense construction. It involves information technology, bioengineering technology, energy technology, nanotechnology, environmental protection technology and other modern high-tech and its industries. Functional materials not only play an important role in promoting and supporting the development of high-tech, but also play an important role in promoting the transformation and upgrading of my country's related traditional industries and achieving leapfrog development. The basic units for preparing functional materials can var...

Claims

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Application Information

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IPC IPC(8): C08F2/48C08F2/01C08F122/14B01J19/00
Inventor 王靖涛韩俊杰陶君
Owner TIANJIN UNIV
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