The dyeing temperature of natural dye lac red on two kinds of natural protein fibers was studied, and the interaction between dyestuff and fiber was discussed through thermodynamic study and density functional theory ...The dyeing temperature of natural dye lac red on two kinds of natural protein fibers was studied, and the interaction between dyestuff and fiber was discussed through thermodynamic study and density functional theory (DFT) calculation. The optimum temperature for lac red dyed silk was 60˚C and wool showed a better response at 90˚C. The thermodynamics study revealed good Nernst isotherm and Freundlich adsorption models respectively, and the lac dye adsorption processes were both spontaneous and exothermic. The potential interaction of Laccaic acid A with the external environment by electrostatic potential and atomic charge distribution was first explored. With molecular simulation, Laccaic acid A and glycine composed 8 stable complexes. Then, typical hydrogen bonds, bond length, and binding energy, etc. were analyzed. The results revealed lac red on silk and wool fabric mainly depended on the weak hydrogen bonds and van der Waals force which determined the low dye fastness.展开更多
A solution-phase approach to the synthesis of nano-Se/silk fibroin colloids（NSeSFC） by reducing selenious acid solution with silk fibroin（SF） was proposed, and the composites were in situ prepared by macrowave met...A solution-phase approach to the synthesis of nano-Se/silk fibroin colloids（NSeSFC） by reducing selenious acid solution with silk fibroin（SF） was proposed, and the composites were in situ prepared by macrowave method. The nanocomposites were characterized with ultraviolet-visible（UV-Vis） absorption spectrometry, resonance Rayleigh scattering（RRS） spectrometry and transmission electron microscopy（TEM）. The nano-Se（0） solution exhibited the strongest resonance Rayleigh scattering at 579 rim. Through the RRS discussion, we found the best preparation and conservation condition of NSeSFC. The TEM image shows the sizes of the Se（0） particles were about 50 nm and dispersed equably. The resulted NSeSFC exhibited good stability, and it can be kept for a long period.展开更多
文摘The dyeing temperature of natural dye lac red on two kinds of natural protein fibers was studied, and the interaction between dyestuff and fiber was discussed through thermodynamic study and density functional theory (DFT) calculation. The optimum temperature for lac red dyed silk was 60˚C and wool showed a better response at 90˚C. The thermodynamics study revealed good Nernst isotherm and Freundlich adsorption models respectively, and the lac dye adsorption processes were both spontaneous and exothermic. The potential interaction of Laccaic acid A with the external environment by electrostatic potential and atomic charge distribution was first explored. With molecular simulation, Laccaic acid A and glycine composed 8 stable complexes. Then, typical hydrogen bonds, bond length, and binding energy, etc. were analyzed. The results revealed lac red on silk and wool fabric mainly depended on the weak hydrogen bonds and van der Waals force which determined the low dye fastness.
基金Supported by the National Natural Science Foundation of China(No20775044)the Natural Science Foundation of Shandong Province of China(NoY2006B20)
文摘A solution-phase approach to the synthesis of nano-Se/silk fibroin colloids（NSeSFC） by reducing selenious acid solution with silk fibroin（SF） was proposed, and the composites were in situ prepared by macrowave method. The nanocomposites were characterized with ultraviolet-visible（UV-Vis） absorption spectrometry, resonance Rayleigh scattering（RRS） spectrometry and transmission electron microscopy（TEM）. The nano-Se（0） solution exhibited the strongest resonance Rayleigh scattering at 579 rim. Through the RRS discussion, we found the best preparation and conservation condition of NSeSFC. The TEM image shows the sizes of the Se（0） particles were about 50 nm and dispersed equably. The resulted NSeSFC exhibited good stability, and it can be kept for a long period.
