scholarly journals Effect of pressure of supercritical carbon dioxide on morphology of wool fibers during dyeing process

2015 ◽  
Vol 19 (4) ◽  
pp. 1297-1300 ◽  
Author(s):  
Lai-Jiu Zheng ◽  
Peng-Peng Yin ◽  
Fang Ye ◽  
Wei Ju ◽  
Jun Yan
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Release Rate ◽  
Surface Brightness ◽  
Color Difference ◽  
Effect Of Pressure ◽  
Pressure Release ◽  
Dyeing Process ◽  
Wool Fibers ◽  
Supercritical Carbon

In this paper, the effect of pressure release rate on dyeing of wool fibers was studied in the supercritical carbon dioxide dyeing. Surface morphology, chemical composition and color difference at different pressure release rates were investigated by employing scanning electron microscope, color matching, and measuring instrument. Experiment data reveal that wool fibers are easy to be damaged with increasing pressure release rate. Fiber?s surface brightness varies also with the pressure release rate. The phenomena are theoretically explained using Bernoulli's principle.

scholarly journals Water in supercritical carbon dioxide dyeing

2015 ◽  
Vol 19 (4) ◽  
pp. 1301-1304 ◽  
Author(s):  
Lai-Jiu Zheng ◽  
Jing-Lu Guo ◽  
Yong-Fang Qian ◽  
Bing Du ◽  
Wei Ju ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Low Temperature ◽  
Supercritical Carbon Dioxide ◽  
Color Difference ◽  
Low Pressure ◽  
Water Interaction ◽  
Effect Of Water ◽  
Dyeing Process ◽  
Wool Fabrics ◽  
Supercritical Carbon

This paper investigates the effect of water serving as entrainer on the dyeing of wool fabrics in supercritical carbon dioxide. Compared with previous supercritical dyeing methods, addition of water makes the dyeing process more effective under low temperature and low pressure. During dyeing process, dyestuff can be uniformly distributed on fabrics?s surface due to water interaction, as a result coloration is enhanced while color difference is decreased.

The effect of pressure on the characteristics of supercritical carbon dioxide extracts from Calamintha nepeta subsp. nepeta

2020 ◽  
Vol 34 (9) ◽  
Author(s):  
Haïfa Debbabi ◽  
Ridha El Mokni ◽  
Siwar Majdoub ◽  
Aslan Aliev ◽  
Saoussen Hammami
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Effect Of Pressure ◽  
Supercritical Carbon

scholarly journals Propagation Characteristics of Supercritical Carbon Dioxide Induced Fractures under True Tri-Axial Stresses

Energies ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 4229 ◽  
Author(s):  
Yi Hu ◽  
Feng Liu ◽  
Yuqiang Hu ◽  
Yong Kang ◽  
Hao Chen ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
In Situ Stress ◽  
Breakdown Pressure ◽  
Ae Energy ◽  
Induced Fractures ◽  
Supercritical Carbon

Supercritical carbon dioxide (SC-CO2) fracturing is a non-aqueous fracturing technology, which has attracted considerable attention on exploiting shale gas. In this study, shale specimens and artificial sandstone specimens were used to conduct SC-CO2 fracturing and water fracturing experiments to investigate the characteristics of SC-CO2 induced fractures. An acoustic emission (AE) monitoring device was employed to monitor the AE energy release rate during the experiment. The experiment results indicate that the breakdown pressure of SC-CO2 fracturing is lower than that of water fracturing under the same conditions, and the AE energy release rate of SC-CO2 fracturing is 1–2 orders of magnitude higher than that of water fracturing. In artificial sandstone, which is homogeneous, the main fracture mainly propagates along the directions perpendicular to the minimum principal stress, no matter if using SC-CO2 or water as the fracturing fluid, but in shale with weak structural planes, the propagation direction of the fracture is controlled by the combined effect of a weak structural plane and in-situ stress.

scholarly journals Dye solubility in supercritical carbon dioxide fluid

2015 ◽  
Vol 19 (4) ◽  
pp. 1311-1315 ◽  
Author(s):  
Jun Yan ◽  
Lai-Jiu Zheng ◽  
Bing Du ◽  
Yong-Fang Qian ◽  
Fang Ye
Keyword(s):  
Carbon Dioxide ◽  
Theoretical Model ◽  
Supercritical Carbon Dioxide ◽  
Distribution Coefficient ◽  
Dyeing Process ◽  
Supercritical Carbon

Supercritical carbon dioxide fluid is an alternative solvent for the water of the traditional dyeing. The solubility of dyestuff affects greatly the dyeing process. A theoretical model for predicting the dye solubility is proposed and verified experimentally. The paper concludes that the pressure has a greater impact on the dyestuff solubility than temperature, and an optimal dyeing condition is suggested for the highest distribution coefficient of dyestuff.

Study of the Effect of Pressure on Melting Behavior of Saturated Fatty Acids in Liquid or Supercritical Carbon Dioxide

2013 ◽  
Vol 58 (6) ◽  
pp. 1861-1866 ◽  
Author(s):  
Vivek Trivedi ◽  
Ruchir Bhomia ◽  
John C Mitchell ◽  
Nichola J Coleman ◽  
Dennis Douroumis ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Fatty Acids ◽  
Supercritical Carbon Dioxide ◽  
Saturated Fatty Acids ◽  
Melting Behavior ◽  
Effect Of Pressure ◽  
Supercritical Carbon

Study on Dyeing of the Plasma Modification Silk Fabric in Supercritical Carbon Dioxide

2011 ◽  
Vol 175-176 ◽  
pp. 661-666 ◽  
Author(s):  
Jun Yan ◽  
Lai Jiu Zheng
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Ph Value ◽  
Orthogonal Experiment ◽  
Plasma Modification ◽  
Silk Fabric ◽  
Dyeing Process ◽  
Before And After ◽  
Fabric Strength ◽  
Supercritical Carbon

A study has been conducted into the dyeing of silk fabric in supercritical carbon dioxide. In order to reach better dyeing effect, plasma modifying is used to silk. Plasma modifying can decompose disulfide bond of the protein fiber, change the state of scale layer and break silk gum of fiber so that dyestuff could infiltrate. Factors of plasma modifying are fixed, including pH value, processing time. And they affect the values of fabric colour feature and fabric strength. In this work, C.I. Disperse Blue-77 and C.I. Disperse Yellow E-3G are used by combining orthogonal experiment and single factor analysis. During dyeing process, temperature and pressure have a great impact on the result. Modification process and dyeing process are optimized, and the best process is determined. The results presented in this study show dyestuff can infiltrate through modified fabric easily. Through the testing, the washing fastness and rubbing fastness of silk fabric after being modified are improved. The changes between before and after dyeing are analyzed by scanning electron microscope and infrared spectrometer. It is showed that modified fabric obtains a better effect.

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