CN103848394A - Hydraulic focusing assembling method for various nano-wire arrays based on micro-fluid chip - Google Patents

Abstract

The invention discloses a hydraulic focusing assembling method for various nano-wire arrays based on a micro-fluid chip. According to the hydraulic focusing assembling method, flow rates, assembling time and components of a sheath flow and a nano-wire solution flow are adjusted to obtain the various parallel nano-wire arrays on the surface of the micro-fluid chip; under the effect of hydraulic focusing, the nano-wire solution flow entering the micro-fluid chip is focused on a pre-set position by the sheath flow in a pre-set size. The method can carry out the hydraulic focusing through the micro-fluid chip so that the operation is simple and the nano-wire arrays with different materials can be directionally and qualitatively assembled; the distribution characteristics of components, positions, sizes, densities and the like of the nano-wire arrays can be controlled, and the controllable assembling of the various horizontal nano-wire arrays can be realized, so that a feasible channel is explored for preparing a nano device from bottom to top.

Description

Based on the multiple nano-wire array hydraulic focusing assemble method of micro-fluid chip

Technical field

The present invention relates to a kind of multiple nano-wire array hydraulic focusing assemble method based on micro-fluid chip, belong to nano-wire array assembling field.

Background technology

Classifying one of practical prerequisite of basic nano-device as with ordered nano linear array is effective integrated package technique.Existing numerous seminar have proposed multiple different nano wire assembling method so far, mainly comprise direct growth method and the rear construction from part of first growth.

Direct growth method, as the advantages such as restriceted envelope growth method, electric field force guidance method, particular crystal orientation growth method are the nano-wire array direction high conformity of being grown, but is only applicable to some material, and the diameter of nano wire and the uniformity of length are difficult to ensure; First construction from part after growth, drives method, shearing force driving method etc. as electric field/magnetic field power drives method, LB method, rolled-on method, static, and advantage is that the material of nano wire is not limited, and nanowire growth environment facies are same, and the character such as its diameter, length and composition are consistent.At present, multiple nano wire horizontal array is having good application prospect aspect biological, environment measuring, but still lacks the nano wire assembling method that has both the advantage such as simple, controlled, material is not limit, the assembling of especially multiple nano-wire array at present.

Summary of the invention

Based on present Research and demand, the object of the invention is to propose a kind of multiple nano-wire array hydraulic focusing assemble method based on micro-fluid chip, the method is by micro-fluid chip hydraulic focusing, realize the controlled assembling of multiple nano wire horizontal array, thereby open up Feasible channel for preparing from bottom to up nano-device.

For achieving the above object, the present invention is realized by following technical scheme:

Based on a multiple nano-wire array hydraulic focusing assemble method for micro-fluid chip, by adjusting flow velocity, built-up time, the composition of sheath stream and nano wire flow of solution, obtain many parallel multiple nano-wire arrays on micro-fluid chip surface, concrete steps are as follows:

1) nano wire flow of solution and the sheath stream that do not carry nano wire are entered to micro-fluid chip from the different entrances of micro-fluid chip, nano wire solution is focused to a thread by the sheath flowing water power of both wings;

2) nano wire carrying in the substrate surface of treated micro-fluid chip and nano wire solution thread is attracted each other, and the nano wire in nano wire solution thread can be deposited to micro-fluid chip substrate surface; And the shearing force of fluid makes nano wire neatly arrange along grain direction;

3) width of nano wire solution thread regulates with the flow velocity of two sheath streams by controlling nano wire flow of solution: in the time that sheath flows the flow velocity increase of relative nano wire flow of solution, thread narrows; When the flow velocity that flows relative nano wire flow of solution when sheath reduces, thread broadens; The position of nano wire solution thread regulates by the flow velocity of controlling two sheath streams: keep nano wire flow of solution flow velocity constant, in the time that a sheath stream increases with respect to another sheath stream flow velocity, the sheath that speed increases fails to be convened for lack of a quorum and occupies more space, another sheath stream is expressed in less space, thereby nano wire solution thread is pushed to another sheath stream; By adjusting the flow velocity of sheath stream and nano wire flow of solution, obtain many parallel nano-wire arrays at micro-fluid chip substrate surface, the width of nano-wire array and position are determined by the velocity ratio of sheath stream and nano wire flow of solution;

4) density of nano-wire array regulates by built-up time, and built-up time is longer, and nano-wire array density is larger;

5) kind of nano-wire array assigns to regulate by the one-tenth of nano wire flow of solution,, in the time that micro-fluid chip diverse location progressively carries out nano wire assembling, uses respectively the nano wire flow of solution of carrying different nano wires.

Described micro-fluid chip comprises sample inflow entrance, upper sheath inflow entrance, lower sheath inflow entrance and waste liquid outlet.This chip by silicon wafer-based at the bottom of and PDMS mould (Polydimethylsiloxane, dimethyl silicone polymer) laminating make.

The present invention compared with prior art, has following apparent outstanding substantive distinguishing features and significantly technological progress:

The inventive method is by micro-fluid chip hydraulic focusing, simple to operate, the nano-wire array of orientable qualitative assembling different materials, the distribution characteristics such as its composition, position, size, density are all controlled, can realize the controlled assembling of multiple nano wire horizontal array, thereby open up Feasible channel for preparing from bottom to up nano-device.

Brief description of the drawings

Fig. 1 is micro-fluid chip structural representation.

Fig. 2 is overall work principle schematic of the present invention.

Detailed description of the invention

The preferred embodiments of the present invention accompanying drawings is as follows:

As depicted in figs. 1 and 2, remove the ethanolic solution of ionized water, nano silver wire and the ethanolic solution of nanowires of gold is prepared nano-wire array.First the sample inflow entrance of stream injection micro-fluid chip taking nano silver wire solution as sample, taking deionized water as sheath, stream injects simultaneously, and nano silver wire solution can be focused into one thread; The size that nano wire solution is focused and position can, by regulating the velocity of flow adjust of sheath stream and sample stream, make nano silver wire solution reach precalculated position with preliminary dimension; After 20 minutes, nano silver wire solution is changed to nanowires of gold solution, adjusts sheath stream flow velocity simultaneously, make nanowires of gold solution reach precalculated position with preliminary dimension.After the set time, stop injecting nano wire solution, use washed with de-ionized water chip internal, then stop all fluids and flow into.Use hot plate heating chip, make fluid evaporator, then take off PDMS mould, finally obtain silver nano line array and the Crystal structure of parallel arrangement on chip base surface.

Claims (2)

1. the multiple nano-wire array hydraulic focusing assemble method based on micro-fluid chip, it is characterized in that, by adjusting flow velocity, built-up time, the composition of sheath stream and nano wire flow of solution, obtain many parallel multiple nano-wire arrays on micro-fluid chip surface, concrete steps are as follows:

1) nano wire flow of solution and the sheath stream that do not carry nano wire are entered to micro-fluid chip from the different entrances of micro-fluid chip, nano wire solution is focused to a thread by the sheath flowing water power of both wings;

2) nano wire carrying in the substrate surface of treated micro-fluid chip and nano wire solution thread is attracted each other, and the nano wire in nano wire solution thread can be deposited to micro-fluid chip substrate surface; And the shearing force of fluid makes nano wire neatly arrange along grain direction;

3) width of nano wire solution thread regulates with the flow velocity of two sheath streams by controlling nano wire flow of solution: in the time that sheath flows the flow velocity increase of relative nano wire flow of solution, thread narrows; When the flow velocity that flows relative nano wire flow of solution when sheath reduces, thread broadens; The position of nano wire solution thread regulates by the flow velocity of controlling two sheath streams: keep nano wire flow of solution flow velocity constant, in the time that a sheath stream increases with respect to another sheath stream flow velocity, the sheath that speed increases fails to be convened for lack of a quorum and occupies more space, another sheath stream is expressed in less space, thereby nano wire solution thread is pushed to another sheath stream; By adjusting the flow velocity of sheath stream and nano wire flow of solution, obtain many parallel nano-wire arrays at micro-fluid chip substrate surface, the width of nano-wire array and position are determined by the velocity ratio of sheath stream and nano wire flow of solution;

4) density of nano-wire array regulates by built-up time, and built-up time is longer, and nano-wire array density is larger;

5) kind of nano-wire array assigns to regulate by the one-tenth of nano wire flow of solution,, in the time that micro-fluid chip diverse location progressively carries out nano wire assembling, uses respectively the nano wire flow of solution of carrying different nano wires.

2. the multiple nano-wire array hydraulic focusing assemble method based on micro-fluid chip according to claim 1, it is characterized in that, described micro-fluid chip comprises sample inflow entrance (1), upper sheath inflow entrance (2), lower sheath inflow entrance (3) and waste liquid outlet (4).

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