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Flow Velocity Deviation of Spinning Solution Under Multi-field Coupling
Zhiming Zhang,Da Hong,Xinyu Huang,Kang Liu,Qiao Xu,Zhen Chen,Qiaoling Ji,Changjin Ke 한국섬유공학회 2023 Fibers and polymers Vol.24 No.10
Rotating jet spinning uses the centrifugal force generated by the high-speed rotation of the motor to keep the spinning solution ejected from the nozzle to form nanofibers. At present, the research work on rotating jet spinning mainly involves the materials, properties and applications of fibers, parameter influence and jet trajectory, while there are few studies on the optimization of spinning core components. In this paper, by analyzing the force and flow state of spinning solution in the flow channel of spinning nozzle, it is found that the maximum velocity region of spinning solution will be offset. The reason for this phenomenon is that the spinning solution is subjected to Coriolis force in the rotating system, resulting in the secondary flow of solution. The relationship between nozzle parameters, solution parameters as well as process parameters, and the outlet velocity of solution was sought, and the structure of spinning nozzle was optimized. The factors affecting velocity offset in straight-tube nozzles and bent-tube nozzles are simulated. High-speed centrifugal spinning experiments were conducted using both unoptimized and optimized nozzles.
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Yan Bao,Jiajia Guo,Jianzhong Ma,Pan Liu,Qiaoling Kang,Jing Zhang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
A series of cationic silicon-based gemini surfactants (Cm-PSi-Cm) having different hydrophobic chains length (m = 8,10,12,14,16,18) were synthesized. Subsequently, surface parameters including equilibrium surface tension (gCMC), critical micelle concentration (CMC), surface pressure at CMC (PCMC) and maximum surface excess (Gmax) were calculated according to the surface tension measurements. The importance of hydrophobic chains length on the surface activity of Cm-PSi-Cm was revealed in detail. With the increasing hydrophobic chains length, the equilibrium surface tension (gCMC) values follow the order of C8-PSi-C8 > C10-PSi-C10 > C12-PSi-C12< C14-PSi-C14< C16-PSi-C16< C18-PSi-C18. The thermodynamic parameters of micellization process, namely, standard Gibbs free energy (DG0 m), enthalpy (DH0 m) and entropy (DS0 m), were derived from conductivity measurements at different temperatures. The aggregation of the cationic silicon-based gemini surfactants (C12-PSi-C12) in aqueous solution at different concentrations was studied by DLS and TEM measurements. The formation of micelles and vesicles in C12-PSi-C12 solutions was observed at a concentration well above the CMC. Moreover, the morphology of vesicles changed from sphere to rod-like, dumbble-like and finally string dumbbell-like with the increasing of the surfactant concentration.
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