Laser-guided electrospinning direct writing device

Abstract

The present invention provides a laser-guided electrospinning direct writing device capable of realizing long-time controllable preparation and precise positioning of single uniform micro / nanostructure. The device is provided with a controller, a high-voltage relay, an electrostatic high-voltage [power] source, a hollow nozzle, a collimating focusing lens set, optical fibers, a sealing adjusting part, a laser, a solution feed pump, a solution feed pipe, a collecting board and a motion platform, wherein the controller is connected with the high-voltage relay; ends of the high-voltage relay arerespectively connected with the electrostatic high-voltage [power] source, the collecting board and a conductor nozzle arranged at the front end of the hollow nozzle; the sealing adjusting part is ina sealing connection with the rear end of the hollow nozzle; the optical fibers pass through the center of the sealing adjusting part and are fixedly connected with the sealing adjusting part; the collimating focusing lens set is arranged at the front end of the optical fibers; the rear end of the optical fibers comes out of the hollow nozzle and is connected with the laser; the solution feed pump is communicated with the hollow nozzle through the solution feed pipe; and the collecting board is fixed on the motion platform and faces the hollow nozzle. The laser constraints the disordered motion of spinning jet flow and guides the spinning jet flow to deposit at the laser spot of the collecting board.

Description

technical field [0001] The invention belongs to the technical field of electrospinning, and relates to an electrospinning direct writing device, in particular to a laser-guided electrospinning direct writing device. Background technique [0002] Electrospinning is the use of electrostatic force to stretch viscoelastic fluid, deform it to generate jets to realize the jetting of nanofibers; as an emerging micro-nano manufacturing technology, electrospinning technology is characterized by its low manufacturing cost, simple process, and wide source of raw materials. And many other advantages, has received extensive attention. Electrospun micro-nanostructures have a wide range of potential applications in flexible electronics, micro-nano devices, and high-sensitivity sensor devices. However, the electrospinning process is affected by many factors such as charge repulsion and fluid disturbance. The polymer jet has many unstable phenomena such as whipping and splitting. The flight...

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Problems solved by technology

R.Dersch et al. ([4]R.Dersch, Taiqi Liu, A.K.Schaper, et al.Journal of Polymer Science Part A: Polymer Chemistry.Vol.41(4):545-553) adopted a three-dimensional metal groove structure as a collection Nanofibers can be deposited on both sides of the microgroove to form an orderly suspended structure, but as the deposition time of nanofibers increases, the movement of subsequent fibers will tend to be chaotic due to the influence of deposited fibers, and the arrangement of nanofibers is difficult to control , the distribution range and arrangement of nanofibers are limited by the pre-prepared collecting plate and cannot be changed arbitrarily

Sun et al. ([5]Sun D.H., Chang C., Li S., et al.Nano.Lett., 2006vol.6, pp.839-842.) and Chang et al. ([6]Chang C., Limkrailassiri K. , Lin L.W.Appl.Phys.Lett., 2008vol.93, pp.123111.) By shortening the distance from the nozzle to the collecting plate (0.5-3mm), the spinning jet is deposited on the collecting plate before entering the stage of disordered movement , the deposition of a single nanofiber is realized, and the electrospun nanofiber structure with different deposition trajectories can be prepared with the movement of the collecting plate, but the distance from the nozzle to the collecting plate is shortened, so that the deformation behavior of the solution at the nozzle and the accumulation on the collecting plate The influence of unstable factors such as charge is enhanced. With the decrease of the distance from the nozzle to the collecting plate, the space movement of nanofibers and the time of solvent evaporation are reduced, which will not be conducive to the preparation of uniform nanofibers.

[0004] Sun et al. ([5] Sun D.H., Chang C., Li S., et al. Nano. Lett., 2006vol.6, 839-842.) and Chang et al. ([6] Chang C., Limkrailassiri K., Lin L.W.Appl.Phys.Lett., 2008vol.93, 123111.) The precise positioning of the electrospinning direct writing technology mainly relies on the microscope to align the relative position between the nozzle and the collecting plate to control the deposition position of the nanofibers, because the nozzle and the collecting plate There is a height difference between them. Affected by the depth of the microscope and visual errors, it is difficult to achieve high-precision positioning and deposition of electrospinning direct-writing micro / nano structures by simply relying on microscope observation and alignment. The microscope has a great impact on the operating level of the operator under test. , poor technical stability makes it difficult to adapt to high-standard assembly line production

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