The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Hideki Shiozaki - One of the best experts on this subject based on the ideXlab platform.
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physical properties and Dyeability of silk fibers degummed with citric acid
Bioresource Technology, 2010Co-Authors: Md Majibur Rahman Khan, Masuhiro Tsukada, Yasuo Gotoh, Hideaki Morikawa, Giuliano Freddi, Hideki ShiozakiAbstract:Abstract Silk fibers from Bombyx mori silkworm was degummed with different concentration of citric acid, and the physical properties and fine structure were investigated to elucidate the effects of citric acid treatment. The silk sericin removal percentage was almost 100% after degumming with 30% citric acid which resulted in a total weight loss of 25.4% in the silk fibers. The surface morphology of silk fiber degummed with citric acid was very smooth and fine, showed perfect degumming like traditional soap-alkali method. The tensile strength of silk fiber was increased after degumming with citric acid (507 MPa), where as the traditional soap-alkali method causes to decrease the strength about half of the control silk fiber (250 MPa). The molecular conformation estimated by Fourier transform infrared spectroscopy and the crystalline structure evaluated from X-ray diffraction curve stayed unchanged regardless of the degumming with citric acid and soap. The dye uptake percentage of silk fiber degummed with citric acid decreased slightly, about 4.2%. On the other hand, the dye uptake percentage of silk degummed with soap was higher which indicates the disordering of the molecular orientation of the laterally ordered structure, accompanied with the partial hydrolysis of silk fibroin molecules by the alkali action of soap. The thermal properties were greatly enhanced by soap and citric acid degumming agents. Dynamic mechanical thermal analysis showed silk degummed with citric acid is more stable in higher temperature than that of soap. With heating at above 300 °C, the silk degummed with citric acid shows an increase in storage modulus and an onset of tan δ peaks at 325 °C and the melt flow of the sample was inhibited. The degumming of silk fibers with citric acid is safe and the results obtained are quite promising as a basis for possible future industrial application.
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physical properties and Dyeability of silk fibers degummed with citric acid
Bioresource Technology, 2010Co-Authors: Md Majibur Rahman Khan, Masuhiro Tsukada, Yasuo Gotoh, Hideaki Morikawa, Giuliano Freddi, Hideki ShiozakiAbstract:Silk fibers from Bombyx mori silkworm was degummed with different concentration of citric acid, and the physical properties and fine structure were investigated to elucidate the effects of citric acid treatment. The silk sericin removal percentage was almost 100% after degumming with 30% citric acid which resulted in a total weight loss of 25.4% in the silk fibers. The surface morphology of silk fiber degummed with citric acid was very smooth and fine, showed perfect degumming like traditional soap-alkali method. The tensile strength of silk fiber was increased after degumming with citric acid (507MPa), where as the traditional soap-alkali method causes to decrease the strength about half of the control silk fiber (250MPa). The molecular conformation estimated by Fourier transform infrared spectroscopy and the crystalline structure evaluated from X-ray diffraction curve stayed unchanged regardless of the degumming with citric acid and soap. The dye uptake percentage of silk fiber degummed with citric acid decreased slightly, about 4.2%. On the other hand, the dye uptake percentage of silk degummed with soap was higher which indicates the disordering of the molecular orientation of the laterally ordered structure, accompanied with the partial hydrolysis of silk fibroin molecules by the alkali action of soap. The thermal properties were greatly enhanced by soap and citric acid degumming agents. Dynamic mechanical thermal analysis showed silk degummed with citric acid is more stable in higher temperature than that of soap. With heating at above 300 degrees C, the silk degummed with citric acid shows an increase in storage modulus and an onset of tan delta peaks at 325 degrees C and the melt flow of the sample was inhibited. The degumming of silk fibers with citric acid is safe and the results obtained are quite promising as a basis for possible future industrial application.
Guizhen Ke - One of the best experts on this subject based on the ideXlab platform.
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effects of corona discharge treatment on the surface properties of wool fabrics
Journal of Materials Processing Technology, 2008Co-Authors: Guizhen Ke, Weidong Yu, Xiaolin ShenAbstract:Wool fabric was treated by corona discharge and treating conditions were optimized. The surface properties of the treated wool fabrics, such as hydrophilicity and Dyeability with natural dyes, have been investigated. After the corona discharge treatment, the hydrophilicity of the wool fabric was improved and the Dyeability with Rhizoma coptidis was increased. Scanning electron microscope (SEM) images indicated that some epicuticle scales on the wool surface became loose. The X-ray photoelectron spectroscopic (XPS) analyses show the oxygen contents of the wool surface were increased and sulphur contents decreased after treatment.
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effects of corona discharge treatment on the surface properties of wool fabrics
Journal of Materials Processing Technology, 2008Co-Authors: Guizhen Ke, Weidong Yu, Weilin Xu, Xiaolin ShenAbstract:Wool fabric was treated by corona discharge and treating conditions were optimized. The surface properties of the treated wool fabrics, such as hydrophilicity and Dyeability with natural dyes, have been investigated. After the corona discharge treatment, the hydrophilicity of the wool fabric was improved and the Dyeability with Rhizoma coptidis was increased. Scanning electron microscope (SEM) images indicated that some epicuticle scales on the wool surface became loose. The X-ray photoelectron spectroscopic (XPS) analyses show the oxygen contents of the wool surface were increased and sulphur contents decreased after treatment.
Md Majibur Rahman Khan - One of the best experts on this subject based on the ideXlab platform.
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physical properties and Dyeability of silk fibers degummed with citric acid
Bioresource Technology, 2010Co-Authors: Md Majibur Rahman Khan, Masuhiro Tsukada, Yasuo Gotoh, Hideaki Morikawa, Giuliano Freddi, Hideki ShiozakiAbstract:Abstract Silk fibers from Bombyx mori silkworm was degummed with different concentration of citric acid, and the physical properties and fine structure were investigated to elucidate the effects of citric acid treatment. The silk sericin removal percentage was almost 100% after degumming with 30% citric acid which resulted in a total weight loss of 25.4% in the silk fibers. The surface morphology of silk fiber degummed with citric acid was very smooth and fine, showed perfect degumming like traditional soap-alkali method. The tensile strength of silk fiber was increased after degumming with citric acid (507 MPa), where as the traditional soap-alkali method causes to decrease the strength about half of the control silk fiber (250 MPa). The molecular conformation estimated by Fourier transform infrared spectroscopy and the crystalline structure evaluated from X-ray diffraction curve stayed unchanged regardless of the degumming with citric acid and soap. The dye uptake percentage of silk fiber degummed with citric acid decreased slightly, about 4.2%. On the other hand, the dye uptake percentage of silk degummed with soap was higher which indicates the disordering of the molecular orientation of the laterally ordered structure, accompanied with the partial hydrolysis of silk fibroin molecules by the alkali action of soap. The thermal properties were greatly enhanced by soap and citric acid degumming agents. Dynamic mechanical thermal analysis showed silk degummed with citric acid is more stable in higher temperature than that of soap. With heating at above 300 °C, the silk degummed with citric acid shows an increase in storage modulus and an onset of tan δ peaks at 325 °C and the melt flow of the sample was inhibited. The degumming of silk fibers with citric acid is safe and the results obtained are quite promising as a basis for possible future industrial application.
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physical properties and Dyeability of silk fibers degummed with citric acid
Bioresource Technology, 2010Co-Authors: Md Majibur Rahman Khan, Masuhiro Tsukada, Yasuo Gotoh, Hideaki Morikawa, Giuliano Freddi, Hideki ShiozakiAbstract:Silk fibers from Bombyx mori silkworm was degummed with different concentration of citric acid, and the physical properties and fine structure were investigated to elucidate the effects of citric acid treatment. The silk sericin removal percentage was almost 100% after degumming with 30% citric acid which resulted in a total weight loss of 25.4% in the silk fibers. The surface morphology of silk fiber degummed with citric acid was very smooth and fine, showed perfect degumming like traditional soap-alkali method. The tensile strength of silk fiber was increased after degumming with citric acid (507MPa), where as the traditional soap-alkali method causes to decrease the strength about half of the control silk fiber (250MPa). The molecular conformation estimated by Fourier transform infrared spectroscopy and the crystalline structure evaluated from X-ray diffraction curve stayed unchanged regardless of the degumming with citric acid and soap. The dye uptake percentage of silk fiber degummed with citric acid decreased slightly, about 4.2%. On the other hand, the dye uptake percentage of silk degummed with soap was higher which indicates the disordering of the molecular orientation of the laterally ordered structure, accompanied with the partial hydrolysis of silk fibroin molecules by the alkali action of soap. The thermal properties were greatly enhanced by soap and citric acid degumming agents. Dynamic mechanical thermal analysis showed silk degummed with citric acid is more stable in higher temperature than that of soap. With heating at above 300 degrees C, the silk degummed with citric acid shows an increase in storage modulus and an onset of tan delta peaks at 325 degrees C and the melt flow of the sample was inhibited. The degumming of silk fibers with citric acid is safe and the results obtained are quite promising as a basis for possible future industrial application.
Soojin Park - One of the best experts on this subject based on the ideXlab platform.
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effect of surface oxyfluorination on the Dyeability of polyethylene film
Joint International Conference on Information Sciences, 2005Co-Authors: Soojin Park, Siyong Song, Junsik Shin, Johnmoon RheeAbstract:The effect of surface oxyfluorination on low-density polyethylene (LDPE) film was studied in terms of surface functionality and surface energetics of the film surfaces, which can be attributed to improvement of the Dyeability. The growth of functional groups and surface free energy was confirmed by FTIR-ATR, XPS, and contact angle methods. As a result, the total surface free energy was increased with oxyfluorination time, as a progressive increase of the polar component together with a small decrease of the dispersive component of surface free energy. From the Dyeability test using the Kubelka-Munk equation, it was found that the oxyfluorination treatment plays an important role in the growth of oxygen-containing functional groups of LDPE film, resulting in improving the Dyeability with a basic dyeing agent. A direct linear relationship is shown between the specific component of surface free energy and the K/S value for this work.
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effect of corona discharge treatment on the Dyeability of low density polyethylene film
Journal of Colloid and Interface Science, 2001Co-Authors: Soojin ParkAbstract:Abstract The effect of corona discharge on low-density polyethylene (LDPE) film was studied in terms of surface functionality and surface energetics of the film surfaces, improving the Dyeability. The introduction of a polar group (O=C–O, C=O, and C–O) to a corona-treated LDPE film with acrylic acid could be confirmed by ESCA. The Owens–Wendt and Wu models using geometric means were studied to analyze the surface free energy of corona-treated film. It was found that the corona-treated LDPE film did lead to an increase in surface free energy, mainly due to the increase of its specific (or polar) component as the corona discharge power increased. Also, the K/S values were increased as the concentrations of dye increased. From the acid–base interaction point of view, it was found that the graft polymerization of acrylic acid onto the corona-treated LDPE film plays an important role in growing the acidic character which is one of the specific components of surface free energy, resulting in improving the Dyeability with basic dyeing agent. A direct linear relationship is shown between the O1s/C1s ratio and the resulting K/S value or the specific component for this work.
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effect of corona discharge treatment on the Dyeability of low density polyethylene film
Journal of Colloid and Interface Science, 2001Co-Authors: Soojin ParkAbstract:Abstract The effect of corona discharge on low-density polyethylene (LDPE) film was studied in terms of surface functionality and surface energetics of the film surfaces, improving the Dyeability. The introduction of a polar group (O=C–O, C=O, and C–O) to a corona-treated LDPE film with acrylic acid could be confirmed by ESCA. The Owens–Wendt and Wu models using geometric means were studied to analyze the surface free energy of corona-treated film. It was found that the corona-treated LDPE film did lead to an increase in surface free energy, mainly due to the increase of its specific (or polar) component as the corona discharge power increased. Also, the K/S values were increased as the concentrations of dye increased. From the acid–base interaction point of view, it was found that the graft polymerization of acrylic acid onto the corona-treated LDPE film plays an important role in growing the acidic character which is one of the specific components of surface free energy, resulting in improving the Dyeability with basic dyeing agent. A direct linear relationship is shown between the O1s/C1s ratio and the resulting K/S value or the specific component for this work.
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effect of corona discharge treatment on the Dyeability of low density polyethylene film
Journal of Colloid and Interface Science, 2001Co-Authors: Soojin Park, Joongseong JinAbstract:The effect of corona discharge on low-density polyethylene (LDPE) film was studied in terms of surface functionality and surface energetics of the film surfaces, improving the Dyeability. The introduction of a polar group (O=C-O, C=O, and C-O) to a corona-treated LDPE film with acrylic acid could be confirmed by ESCA. The Owens-Wendt and Wu models using geometric means were studied to analyze the surface free energy of corona-treated film. It was found that the corona-treated LDPE film did lead to an increase in surface free energy, mainly due to the increase of its specific (or polar) component as the corona discharge power increased. Also, the K/S values were increased as the concentrations of dye increased. From the acid-base interaction point of view, it was found that the graft polymerization of acrylic acid onto the corona-treated LDPE film plays an important role in growing the acidic character which is one of the specific components of surface free energy, resulting in improving the Dyeability with basic dyeing agent. A direct linear relationship is shown between the O(1s)/C(1s) ratio and the resulting K/S value or the specific component for this work. Copyright 2001 Academic Press.
Xiaolin Shen - One of the best experts on this subject based on the ideXlab platform.
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effects of corona discharge treatment on the surface properties of wool fabrics
Journal of Materials Processing Technology, 2008Co-Authors: Guizhen Ke, Weidong Yu, Xiaolin ShenAbstract:Wool fabric was treated by corona discharge and treating conditions were optimized. The surface properties of the treated wool fabrics, such as hydrophilicity and Dyeability with natural dyes, have been investigated. After the corona discharge treatment, the hydrophilicity of the wool fabric was improved and the Dyeability with Rhizoma coptidis was increased. Scanning electron microscope (SEM) images indicated that some epicuticle scales on the wool surface became loose. The X-ray photoelectron spectroscopic (XPS) analyses show the oxygen contents of the wool surface were increased and sulphur contents decreased after treatment.
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effects of corona discharge treatment on the surface properties of wool fabrics
Journal of Materials Processing Technology, 2008Co-Authors: Guizhen Ke, Weidong Yu, Weilin Xu, Xiaolin ShenAbstract:Wool fabric was treated by corona discharge and treating conditions were optimized. The surface properties of the treated wool fabrics, such as hydrophilicity and Dyeability with natural dyes, have been investigated. After the corona discharge treatment, the hydrophilicity of the wool fabric was improved and the Dyeability with Rhizoma coptidis was increased. Scanning electron microscope (SEM) images indicated that some epicuticle scales on the wool surface became loose. The X-ray photoelectron spectroscopic (XPS) analyses show the oxygen contents of the wool surface were increased and sulphur contents decreased after treatment.
