Papers by Keyword: Taylor Cone

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Authors: Da Li Liu, Chang Juan Jing, Yuan Yuan Liu, Qing Xi Hu
Abstract: Electrospinning is kind of unique craft to fabricate nanoscale fiber in the condition of high-voltage electric field. However, due to the nanoscale diameter manufacturing, it is a challenge to get the whole manufacturing process stable at certain level. For that sake, this paper figures out the monitor method for the electrospinning equipment, which solves the former matter as well as makes the fiber generating process in control. According to the method, CCD camera is put forward to make the detection of the Taylor cone image continuously, while pattern recognition algorithm is used to real-time monitor the shape and size of Taylor cone which indicate the stable process of electrospinning. In order to get the stable Taylor cone shape, the processing result is used as feedback signal for control system of the electrospinning equipment to coordinate the feeding module or power supply module. As a result, the problem of nonuniformity and uncontrollable about electrospinning has been solved effectively; what's more, experiments testify that this method is reliable and effective.
Authors: Jonathan Stranger, Mark P. Staiger, Nick Tucker, Kerry Kirwan
Abstract: A detailed understanding of charge density and its origins during the electrospinning process is desirable for developing new electrospinnable polymer-solvent systems and ensuring mathematical models of the process are accurate. In this work, two different approaches were taken to alter the charge density in order to measure its effect on the Taylor cone, mass deposition rate and initial jet diameter. It was found that an increase in charge density results in a decrease in the mass deposition rate and initial jet diameter. A theory is proposed for this behaviour in that an increase in charge density leads to the tip of the Taylor cone forming a smaller radius of curvature resulting in the concentration of electric stresses at the tip. This leads to the electrostatic forces drawing the initial jet from a smaller effective area or “virtual orifice”.
Authors: Ji Hoon Cha, Tae Hong Kim, Young Hoo Kim, Kun Tack Lee, Yong Sun Koh
Abstract: The general method to remove contaminated particles in the non-pattern cleaning such as pre-photo cleaning, post-deposition cleaning, and post-CMP cleaning is to physically remove particles using spray nozzle. However, high-speed fluids for increasing particle removal efficiency cause static electricity due to friction between liquid and nozzle surfaces, resulting in unexpected charge defects. In this study, we propose a method to reduce static electricity by changing the material of nozzle and grounding by visualizing static electricity according to electric voltage.
Authors: Pavel Topala, Vladislav Rusnac, Dorin Guzgan
Abstract: This paper presents the results of experimental research on Taylor cone shaped menisci formation on the surfaces of pieces by applying electric discharges in pulse. It examines the influence of energy stored in the capacitor and of pulse duration on their formation. The modification of piece surface micro-geometry aims to increase the capacity of absorption of radiation and of particle emission. It shows that the size of formed menisci depends on the energy regime of machining, on the gap size, on the duration of electric discharges in pulse and on thermal physical properties of the material used to execute the piece.
Authors: Hui Fen Guo, Bin Gang Xu
Abstract: Nanofibers produced by electrospinning are attractive for a large variety of applications in material science. Formation of Taylor cone is an integral part of electrospinning process. To understand deeply its formation, a two-phase electro-hydrodynamic simulation under the volume-of-fluid (VOF) model is proposed. The electric force in such systems acts only at the interface and is zero elsewhere in the two fluids. Continuum surface force (CSF) model is adopted to compute the electric field force at the interface. For the study case, transient analyses showed the moving flow fronts and their interactions with the applied electric field. Two symmetric vortices, which occur in Taylor cone, will increase the solution velocity. A beaded nanofiber can be formed owing to the beads occur in cone jet. The numerical results were consistent with previous studies. According to the numerical results, the formation mechanism and nanofiber dynamics of the Taylor cone in a multiphase flow were well disclosed for deep explanation of the process.
Authors: Yuan Yuan Liu, Chang Juan Jing, Da Li Liu, Qing Xi Hu, Qing Wei Li
Abstract: Electrospinning is an effective and versatile technology to fabricate ultrafine nanofiber,however further development is urgently limited due to the low uniformity distribution and unpredictable feature of the fiber deposited. For that sake, experiment has been done and analyzed to address these problems. Relation between process physics-Taylor cone and fiber diameter characters has been discovered. Furthermore, the feature parameters of the Taylor cone are extracted effectively by CCD detection and image processing. The above experiments results and processing data is analysis and examed by the steady jet theory. This paper offers significant theoretical guidance and technical support to the online control of electrospinning fiber diameter.
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