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Experimental Characterization and Mechanism of Bubble-electrospinning

Author: YangQin
Tutor: HeJiHuan
School: Donghua University
Course: Textile Material and Textiles Design
Keywords: Polyacrylonitrile Bubble electrospinning Nanofibers Bubble
CLC: TQ340.6
Type: Master's thesis
Year: 2010
Downloads: 138
Quote: 0
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Abstract


With the rise of nanotechnology, it is given can be prepared the continuous electrospinning nanofibers with great concern, and do a more systematic theoretical study electrospinning method is the electric field generated by high voltage electrostatic force tensile polymer solution or melt to be an important method of preparing a nanofiber and also preparing nanofiber most direct and simple method, the special nature of the nanofibers, such as a large specific surface area, excellent mechanical properties, so that the electrospun nanofibers with a wide range of uses, but the traditional electrostatic spinning low output, limiting its industrial applications, the bubble electrospinning method is a new electrospinning method to achieve mass production of a certain degree of electrospun fibers. Polyacrylonitrile fibers is the main raw material for the preparation of carbon fibers, nano polyacrylonitrile fiber mat can be made after a pre-oxidation and oxidation processing nanoscale carbon fiber felt, the wide range of applications of the carbon fibers can be prepared, this paper bubble electrospinning technique Preparation polyacrylonitrile nanofibers, the experimental part of the bubble electrospinning using poly acrylonitrile (PAN) and / NN dimethyl formamide (DMF) system, and adjusting the process parameters, including the reception distance, and the mass fraction of the polymer solution, applied voltage, environmental temperature and humidity, and so on, one by one electrospinning experiments, and analyze the impact of various parameters of fiber fineness and form, experimental discovery: With the increase of the mass fraction of the polymer solution, the diameter of the fiber increases; fiber diameter with forward the spinning voltage increases, the fiber morphology, the surface of the bubble electrostatic spinning the resulting fibers have a 'dimple', and its quantity is reduced as the voltage increases; collection distance increases so that the diameter of the fibers greatly reduced diameter of only 38nm fiber to collect the average diameter of the fiber mat minimum up to 110nm, but when the receiver distance ≥ 12cm fiber diameter distribution after Kolmogorov - Smirnov test no longer meets the normal distribution; l high ambient temperature to the discrete nature of the distribution of the fiber diameter increases; ambient humidity PAN fiber diameter; made bubble electrospinning traditional electro-spun fiber diameter and fiber morphology rough comparison, the results show the same mass fraction PAN solution was subjected to spinning, the diameter of the bubble electrostatic spinning the resulting fibers is greatly reduced; both the resulting fibrous mat also has the differences in appearance, a field emission scanning electron micrograph shows the different spinning process parameters, and spinning methods resulting The nanofiber morphology changes. The paper also carried of bubble electrospinning spinning mechanism preliminary study, made sure to elaborate on the characteristics of the single bubble film and multi-bubble interaction characteristics, the surface tension of the bubble only its radius related experimental observations and theoretical analysis also were studied by force and movement of the bubbles in the electrospinning process, bubble rupture process and bubble jet shape, the numerical simulation of the bubble, the bubble electrospinning mathematical models and systems theory analysis has been improved in further studies.

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