Novel green ceramic pigments Y_(3)Ga_(3)MgSiO_(12)∶xCr^(3+)(x=0−0.2)were successfully synthesized via the conventional solid-state approach.The properties of the pigments were studied by XRD,FE-SEM,UV-Vis spectroscop...Novel green ceramic pigments Y_(3)Ga_(3)MgSiO_(12)∶xCr^(3+)(x=0−0.2)were successfully synthesized via the conventional solid-state approach.The properties of the pigments were studied by XRD,FE-SEM,UV-Vis spectroscopy,XPS,and chromaticity analysis.The findings reveal that the trivalent chromium ions occupy the[Ga1O6]octahedral sites within the garnet lattice,and the relatively weak crystal field environment provided by the matrix endows the pigments with green characteristics.The samples prepared by calcination at 1400℃exhibit the most excellent performance in terms of phase purity,morphology,and color properties.The chromaticity values for the representative sample Y_(3)Ga_(3)MgSiO_(12)∶0.05Cr^(3+)are L^(*)=81.16,a^(*)=−12.53,and b^(*)=12.71,and the color remains stable after the stability test.Moreover,when glazed with Y_(3)Ga_(3)MgSiO_(12)∶xCr^(3+)(x=0−0.2)pigments,the smooth glaze surfaces exhibit vivid and saturated green tones,demonstrating their remarkable coloring capabilities and promising potential as a practical pigment for medium-temperature applications.This research underscores the vast application prospects of Y_(3)Ga_(3)MgSiO_(12)∶Cr^(3+)as an innovative green ceramic pigment.展开更多
Cotton has enormous economic potential,providing high-quality protein,oil,and fibre.But the comprehensive utilization of cottonseed is limited by the presence of pigment gland and its inclusion.Pigment gland is a comm...Cotton has enormous economic potential,providing high-quality protein,oil,and fibre.But the comprehensive utilization of cottonseed is limited by the presence of pigment gland and its inclusion.Pigment gland is a common characteristic of Gossypium genus and its relatives,appearing as visible dark opaque dots in most tissues and organs of cotton plants.Secondary metabolites,such as gossypol,synthesized and stored in the cavities of pigment glands act as natural phytoalexins,but are toxic to humans and other monogastric animals.However,only a few cotton genes have been identified as being associated with pigment gland morphogenesis to date,and the developmental processes and regulatory mechanism involved in pigment gland formation remain largely unclear.Here,the research progress on the process of pigment gland morphogenesis and the genetic basis of cotton pigment glands is reviewed,for providing a theoretical basis for cultivating cotton with the ideal pigment gland trait.展开更多
A novel kind of waterborne epoxy coating pigmented by nano-sized aluminium powders on high strength steel was formulated. Several coatings with different pigment volume content (PVC) were prepared. The coating morphol...A novel kind of waterborne epoxy coating pigmented by nano-sized aluminium powders on high strength steel was formulated. Several coatings with different pigment volume content (PVC) were prepared. The coating morphology was observed using scanning electron microscopy (SEM), and the electrochemical properties were investigated by electrochemical impedance spectroscopy (EIS). Immersion test and neutral salt spray test were also conducted to investigate the corrosion resistance of the coating. It is demonstrated that the critical pigment volume content (CPVC) value is between 30% and 40%. The coating with PVC of 30% exhibits good corrosion resistance in 3.5% (mass fraction) NaCl solution.展开更多
This paper carried on a preliminary study on pigment composition of lilies of different colors by means of specific color reactions and UV-visible spectra. The results showed that the colors of lilies were usually cau...This paper carried on a preliminary study on pigment composition of lilies of different colors by means of specific color reactions and UV-visible spectra. The results showed that the colors of lilies were usually caused by the combined action of several pigments; yellow and orange lilies mainly contained the flavonoids and carotenoids; pink lilies mainly contained fiavonoids and anthocyanins, and white lilies contained small amount of flavonoids.展开更多
Cd(S1-xSex) pigments (red to yellow) were synthesized by precipitate-hydrothermal method. The structure, morphology and hue of the powder were characterized by X-ray diffractometry (XRD), scanning electron microscopy ...Cd(S1-xSex) pigments (red to yellow) were synthesized by precipitate-hydrothermal method. The structure, morphology and hue of the powder were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDAX) and CIE chromaticity. The optimum synthesis conditions were obtained and reaction mechanism was further analyzed as well. The results show that molar ratio of S to Se, pH value and hydrothermal reaction conditions have great effects on the hues of the pigments. Pigments with vivid hues are obtained under the conditions that pH value is about 13.0, hydrothermal reaction condition is at 140 ℃ for 4 h or at 160 ℃ for 6 h. The reaction mechanism is that Se2- of Cd(S1-xSex) substitutes S2- of CdS and then forms a continuous solid solution.展开更多
The stability was studied of the pigment in red pulp plum (Prunus salicina Lindl). The results showed that the pigment had a high resistance to heat and it′s stability seemed to be affected greatly by pH, and red pu...The stability was studied of the pigment in red pulp plum (Prunus salicina Lindl). The results showed that the pigment had a high resistance to heat and it′s stability seemed to be affected greatly by pH, and red pulp plum was suitable to be applied for making acid food. Several kinds of metallic ions including Na + 、Zn 2+ had an effect of reinforcement on its tone, however Fe 3+ had a disruptive effect. Sucrose had no undesirable effect, but vitamin C had a significant undesirable effect. Also the preservative of sodium benzoate had a definite undesirable effect. The pigment showed strong resistance to reducer sodium sulfite but was very weak in resistance to oxidizer hydrogen peroxide.展开更多
文摘Novel green ceramic pigments Y_(3)Ga_(3)MgSiO_(12)∶xCr^(3+)(x=0−0.2)were successfully synthesized via the conventional solid-state approach.The properties of the pigments were studied by XRD,FE-SEM,UV-Vis spectroscopy,XPS,and chromaticity analysis.The findings reveal that the trivalent chromium ions occupy the[Ga1O6]octahedral sites within the garnet lattice,and the relatively weak crystal field environment provided by the matrix endows the pigments with green characteristics.The samples prepared by calcination at 1400℃exhibit the most excellent performance in terms of phase purity,morphology,and color properties.The chromaticity values for the representative sample Y_(3)Ga_(3)MgSiO_(12)∶0.05Cr^(3+)are L^(*)=81.16,a^(*)=−12.53,and b^(*)=12.71,and the color remains stable after the stability test.Moreover,when glazed with Y_(3)Ga_(3)MgSiO_(12)∶xCr^(3+)(x=0−0.2)pigments,the smooth glaze surfaces exhibit vivid and saturated green tones,demonstrating their remarkable coloring capabilities and promising potential as a practical pigment for medium-temperature applications.This research underscores the vast application prospects of Y_(3)Ga_(3)MgSiO_(12)∶Cr^(3+)as an innovative green ceramic pigment.
基金National Key Technology R&D Program of China(2022YFF1001403)National Science Foundation of China(32101764).
文摘Cotton has enormous economic potential,providing high-quality protein,oil,and fibre.But the comprehensive utilization of cottonseed is limited by the presence of pigment gland and its inclusion.Pigment gland is a common characteristic of Gossypium genus and its relatives,appearing as visible dark opaque dots in most tissues and organs of cotton plants.Secondary metabolites,such as gossypol,synthesized and stored in the cavities of pigment glands act as natural phytoalexins,but are toxic to humans and other monogastric animals.However,only a few cotton genes have been identified as being associated with pigment gland morphogenesis to date,and the developmental processes and regulatory mechanism involved in pigment gland formation remain largely unclear.Here,the research progress on the process of pigment gland morphogenesis and the genetic basis of cotton pigment glands is reviewed,for providing a theoretical basis for cultivating cotton with the ideal pigment gland trait.
基金Project(51001007) supported by the National Natural Science Foundation of ChinaProject(2011ZE51057) supported by the Aero Science Foundation of China
文摘A novel kind of waterborne epoxy coating pigmented by nano-sized aluminium powders on high strength steel was formulated. Several coatings with different pigment volume content (PVC) were prepared. The coating morphology was observed using scanning electron microscopy (SEM), and the electrochemical properties were investigated by electrochemical impedance spectroscopy (EIS). Immersion test and neutral salt spray test were also conducted to investigate the corrosion resistance of the coating. It is demonstrated that the critical pigment volume content (CPVC) value is between 30% and 40%. The coating with PVC of 30% exhibits good corrosion resistance in 3.5% (mass fraction) NaCl solution.
文摘This paper carried on a preliminary study on pigment composition of lilies of different colors by means of specific color reactions and UV-visible spectra. The results showed that the colors of lilies were usually caused by the combined action of several pigments; yellow and orange lilies mainly contained the flavonoids and carotenoids; pink lilies mainly contained fiavonoids and anthocyanins, and white lilies contained small amount of flavonoids.
基金Project(2005DFBA028) supported by the International Cooperation of Science and Technology of Ministry of ChinaProject(LA06030) supported by the Undergraduate Innovation Education of Central South University, China
文摘Cd(S1-xSex) pigments (red to yellow) were synthesized by precipitate-hydrothermal method. The structure, morphology and hue of the powder were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDAX) and CIE chromaticity. The optimum synthesis conditions were obtained and reaction mechanism was further analyzed as well. The results show that molar ratio of S to Se, pH value and hydrothermal reaction conditions have great effects on the hues of the pigments. Pigments with vivid hues are obtained under the conditions that pH value is about 13.0, hydrothermal reaction condition is at 140 ℃ for 4 h or at 160 ℃ for 6 h. The reaction mechanism is that Se2- of Cd(S1-xSex) substitutes S2- of CdS and then forms a continuous solid solution.
文摘The stability was studied of the pigment in red pulp plum (Prunus salicina Lindl). The results showed that the pigment had a high resistance to heat and it′s stability seemed to be affected greatly by pH, and red pulp plum was suitable to be applied for making acid food. Several kinds of metallic ions including Na + 、Zn 2+ had an effect of reinforcement on its tone, however Fe 3+ had a disruptive effect. Sucrose had no undesirable effect, but vitamin C had a significant undesirable effect. Also the preservative of sodium benzoate had a definite undesirable effect. The pigment showed strong resistance to reducer sodium sulfite but was very weak in resistance to oxidizer hydrogen peroxide.
