Glyoxalation of Kraft lignin and optimization of electrospinning process parameters for producing polyacrylonitrile/KL nanomats for potential applications as carbon material

2020 ◽  
Vol 27 (11) ◽  
Author(s):  
Lara Robert Nahra ◽  
Mirabel Cerqueira Rezende ◽  
Maurício Pinheiro Oliveira ◽  
Lília Müller Guerrini
Keyword(s):  
Process Parameters ◽  
Carbon Material ◽  
Kraft Lignin ◽  
Electrospinning Process ◽  
Potential Applications

Numerical Simulation of Viscous Jet for Near-Field Electrospinning

2009 ◽  
Vol 60-61 ◽  
pp. 465-469 ◽  
Author(s):  
Yuan Yuan Zhong ◽  
Gao Feng Zheng ◽  
Dao Heng Sun
Keyword(s):  
Numerical Simulation ◽  
Field Strength ◽  
Process Parameters ◽  
Near Field ◽  
Solution Concentration ◽  
Electrospinning Process ◽  
Substrate Distance ◽  
Viscous Jet ◽  
Set Up ◽  
The Impact

Near-Field Electrospinning (NFES) is a newly developed method to fabricate continuous and ordered solid nanofibers, with smaller spinneret-to-collector-distance the behavior of viscous jet would play a more prominent effect on the deposition and morphology of nanofiber. In this paper, a 2-dimentional physical model based on electrohydrodynamics and rheology was set up to discuss the morphology of viscous jet for NFES. The profile of the jet along z direction can be predicted by this model, and the impact of process parameters on the jet radius is analyzed. Radius of jet decreases with spinneret-to-substrate-distance decreasing; jet radius decreases with applied voltage and electric field strength increasing; jet electrospun from PEO solution is thinner than that from PVA solution with the same solution concentration; solution concentration has insignificant influence on the radius of jet from solution of the same polymer (PVA or PEO). This numerical simulation would improve the control of electrospinning process in NFES.

Integration of Lenticular Displays with Image Switching and Infrared Watermark

2015 ◽  
Vol 764-765 ◽  
pp. 1260-1264
Author(s):  
Yen I Liao ◽  
Hsi Chun Wang
Keyword(s):  
Carbon Material ◽  
Value Added ◽  
Infrared Detection ◽  
Infrared Light ◽  
Switching Effect ◽  
Digital Halftoning ◽  
Brand Protection ◽  
Potential Applications ◽  
Lenticular Lens ◽  
Lens Image

The objective of this paper is to integrate lenticular lens with switching images and embedding the infrared watermark to provide value-added and anti-counterfeiting features. Digital halftoning technique has been used to compose animated graphics and the infrared watermark. The infrared watermark consists of halftone dots in cyan, magenta, yellow, and black inks. The carbon material in black ink absorbs the infrared light and the watermark could be displayed under infrared detection. By using the lenticular lens, image-switching effect can be observed from different viewing angles. The results show that it is successful to implement a lenticular display with both image-switching feature and hidden watermark which can be decoded under infrared detection. The proposed method has many potential applications to anti-counterfeiting and brand protection.

Optimization and physical performance evaluation of electrospun nanofibrous mats of PLA, PCL and their blends

2020 ◽  
pp. 152808372094450
Author(s):  
Deepika Sharma ◽  
Bhabani K Satapathy
Keyword(s):  
Physical Performance ◽  
Process Parameters ◽  
Optimization Technique ◽  
Electrospinning Process ◽  
Sequential Optimization ◽  
Orifice Diameter ◽  
Solvent Ratio ◽  
Solvent Mixtures ◽  
Minimum Diameter ◽  
Hierarchical Processing

The optimization of process parameters such as applied voltage, orifice diameter, solvent system, and solvent ratio for electrospinning of neat polymers, polylactic acid (PLA) and poly (є-caprolactone) (PCL), to obtain uniform, randomly oriented nanofibers with minimum diameter variation and beaded structures has been critically discussed. The paper focuses on establishing a sequential optimization technique for arriving at a common set of electrospinning process parameters for individual polymers, such as, applied voltages, orifice diameters, solvent mixtures, solvent ratios, to be used in the fabrication of electrospun nanofibrous mats (ENMs) of blended polymers. In this study, the effect of variation of applied voltages, orifice diameters, solvent mixtures, solvent ratios, PLA/PCL blending ratios, solution concentration of blends and flow rate were reported via morphological analysis of electrospun nanofibers. The set of optimal process parameters obtained for both PLA and PCL were adopted for the fabrication of ENMs based on the PLA/PCL blends. The paper further deliberates on the physical performance of PLA/PCL based ENMs in acidic, basic and neutral release media. Thus, the study establishes a hierarchical processing optimization route for designing blended ENMs by following a set of variable electrospinning process parameters.

Ion Induced Mixing of AlGaAs/GaAs Superlattices

1987 ◽  
Vol 93 ◽  
Author(s):  
T. Venkatesan ◽  
S. A. Schwarz ◽  
P. Mei ◽  
H. W. Yoon
Keyword(s):  
Thermal Stability ◽  
Process Parameters ◽  
Alloy Composition ◽  
Device Fabrication ◽  
Crystalline Quality ◽  
Good Crystalline Quality ◽  
Potential Applications ◽  
Mixed Layers ◽  
High Degree ◽  
Thermal Stability Of

ABSTRACTSubsequent to the implantation of certain ions, the thermal stability of AlGaAs/GaAs superlattices can be reduced, enabling mixing of the layers at temperatures where they would otherwise be stable. The mixed layers have intermediate alloy composition and are of good crystalline quality. As a result this process is of great value in device fabrication where a high degree of vertical and lateral bandgap control is desirable. This paper reviews our work in understanding the mechanism of diffusion, its dependence on varilous process parameters, and potential applications in device fabrication.

Production of polyols via direct hydrolysis of kraft lignin: Effect of process parameters

2013 ◽  
Vol 139 ◽  
pp. 13-20 ◽  
Author(s):  
Nubla Mahmood ◽  
Zhongshun Yuan ◽  
John Schmidt ◽  
Chunbao (Charles) Xu
Keyword(s):  
Process Parameters ◽  
Kraft Lignin ◽  
Hydrolysis Of ◽  
Direct Hydrolysis

scholarly journals Electrospinning process parameters dependent investigation of TiO2 nanofibers

2018 ◽  
Vol 11 ◽  
pp. 223-231 ◽  
Author(s):  
M.V. Someswararao ◽  
R.S. Dubey ◽  
P.S.V. Subbarao ◽  
Shyam Singh
Keyword(s):  
Process Parameters ◽  
Electrospinning Process ◽  
Tio2 Nanofibers

scholarly journals Optimal FSW Process Parameters to Improve the Strength of Dissimilar AA6061-T6 to Cu Welds with Zn Interlayer

2019 ◽  
Vol 8 (4) ◽  
pp. 11688-11695
Keyword(s):  
Process Parameters ◽  
Empirical Relation ◽  
Travel Speed ◽  
Strength Properties ◽  
Dissimilar Welding ◽  
Test Results ◽  
Friction Stir ◽  
Taguchi Design Of Experiments ◽  
Potential Applications ◽  
Tool Pin

Dissimilar welding of Al-Cu has many potential applications in electric power, electronic and piping industries due to high corrosion resistance, heat and conducting properties. Weld joints through friction stir welding (FSW) process are free from melting- and solidification-related defects. Compared to the recently used Box–Behnken design of response surface methodology, a simple and reliable modified Taguchi design of experiments is utilized for the dissimilar welding of AA6061-T6 to Cu with Zn interlayer to obtain the optimal FSW process parameters and the expected range of strength properties. Empirical relation for the tensile strength is developed in terms of FSW process parameters (viz., tool rotation speed, tool travel speed and tool pin offset) and validated through test results. Most of the test data are within the expected range.

Research on Optimization of Laser Cladding Process Parameters Based on Orthogonal Experimental Method

2020 ◽  
Vol 866 ◽  
pp. 72-81
Author(s):  
Da Shu ◽  
Si Chao Dai ◽  
Ji Chao Sun ◽  
Feng Tao ◽  
Ping Xiao ◽  
...  
Keyword(s):  
Dilution Rate ◽  
Laser Cladding ◽  
Process Parameters ◽  
Orthogonal Experiment ◽  
Scanning Speed ◽  
Optimum Level ◽  
Scoring Method ◽  
Laser Cladding Process ◽  
Potential Applications ◽  
Orthogonal Experiment Method

The orthogonal experiment method is used in optimal design of laser cladding, such as laser power (P), scanning speed (SS), powder feeding rate (PFR) and shielding gas velocity (SGV) etc. Both the dilution rate and the aspect ratio are investigated by comprehensive scoring method, which transforms multi-index into single index. In view of the nonlinear characteristics of laser cladding process parameters, the optimum level of each factor based on interaction effect is obtained by analyzing binary tables. Finally, the relationship between the laser cladding process parameters and the two indexes (the dilution rate and the ratio of width to height of coating) is obtained. This method has potential applications for the further investigating on the laser cladding process rules.

Effect of magnetic lens on the electrospinning whipping instability, fiber diameter and its distribution

2021 ◽  
pp. 004051752110666
Author(s):  
Peng Chen ◽  
Qihong Zhou ◽  
Jun Wang ◽  
Ge Chen
Keyword(s):  
Fiber Diameter ◽  
Electrospinning Process ◽  
Diameter Distribution ◽  
Liquid Jets ◽  
Magnetic Lens ◽  
Straightforward Method ◽  
Excitation Coil ◽  
Potential Applications ◽  
Exciting Coil ◽  
Plate Type

Electrospinning is an efficient and straightforward method for producing thin fibers from various materials. Although such thin fibers have diverse potential applications, the remaining problems with electrospinning are the whipping instability (also known as bending instability) of electrically charged liquid jets of polymer nanofibers and uneven fiber diameter distribution. In this study, we report a novel magnetic lens electrospinning system and discuss the principle of reducing the fiber diameter and width of the whipping circle in this electrospinning process. The effects of three types of electrospinning devices, needle-to-plate, needle-exciting coil-to-plate, and needle-magnetic lens-to-plate types, were studied through numerical simulation to analyze the electrospinning fiber collection state. For the 12 wt% polyacrylonitrile solution, when the applied voltage was 14–20 kV, the feed rate was 0.4–0.7 ml/h, and the current applied to the excitation coil or magnetic lens was 1 A, the experimental results demonstrated that, compared with needle-to-plate-type and needle-exciting coil-to-plate-type electrospinning, needle-magnetic lens-to-plate-type electrospinning produced smaller whipping circles with thinner and more uniform fibers.

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