为了探究纳米颗粒添食育蚕改性蚕丝纤维的染色性能,选用2%质量分数的纳米二氧化钛和纳米氧化铜添喂家蚕,将蚕茧脱胶后进行染色并测定上染率、色深值等指标,同时探究了酸性橙Ⅱ对蚕丝纤维的染色动力学和热力学机制。结果表明:纳米颗粒添...为了探究纳米颗粒添食育蚕改性蚕丝纤维的染色性能,选用2%质量分数的纳米二氧化钛和纳米氧化铜添喂家蚕,将蚕茧脱胶后进行染色并测定上染率、色深值等指标,同时探究了酸性橙Ⅱ对蚕丝纤维的染色动力学和热力学机制。结果表明:纳米颗粒添食能改善蚕丝纤维的染色性能;酸性染料和活性染料对改性蚕丝纤维的上染率和表观色深(K S值)均高于空白组,洗涤20次后K S值仍高于空白组1.5和2.0。染色动力学和热力学分析表明酸性橙Ⅱ对各组蚕丝纤维上染过程均符合准二级吸附动力学方程和朗格缪尔(Langmuir)吸附,且属于放热过程,较低温度下更适合染色;60℃下纳米TiO 2和纳米CuO改性蚕丝纤维的实际吸附平衡饱和量分别比空白组高了0.14 g kg和1.04 g kg,计算得到染料吸附的最大值分别比空白组高了5.31 g kg和14.58 g kg,显示了改性蚕丝纤维更优的染色性能。展开更多
A new saikosaponin was isolated from Bupleurum chinense DC., and its structure was identified as 3β,16α,23,28,30_pentahydroxy_olean_11,13(18)_dien_3_O_β_D_glucopyranosyl(1→6)_[α_L_rhamnopyranosyl (1→4)]_β_D...A new saikosaponin was isolated from Bupleurum chinense DC., and its structure was identified as 3β,16α,23,28,30_pentahydroxy_olean_11,13(18)_dien_3_O_β_D_glucopyranosyl(1→6)_[α_L_rhamnopyranosyl (1→4)]_β_D_glucopyranoside on the basis of chemical and spectral evidence, named as saikosaponin q_1. In addition, two known saikosaponins, 3″_O_acetyl_saikosaponin d and 3″_O_acetyl_saikosaponin b 2, were also isolated and identified from this plant for the first time.展开更多
文摘为了探究纳米颗粒添食育蚕改性蚕丝纤维的染色性能,选用2%质量分数的纳米二氧化钛和纳米氧化铜添喂家蚕,将蚕茧脱胶后进行染色并测定上染率、色深值等指标,同时探究了酸性橙Ⅱ对蚕丝纤维的染色动力学和热力学机制。结果表明:纳米颗粒添食能改善蚕丝纤维的染色性能;酸性染料和活性染料对改性蚕丝纤维的上染率和表观色深(K S值)均高于空白组,洗涤20次后K S值仍高于空白组1.5和2.0。染色动力学和热力学分析表明酸性橙Ⅱ对各组蚕丝纤维上染过程均符合准二级吸附动力学方程和朗格缪尔(Langmuir)吸附,且属于放热过程,较低温度下更适合染色;60℃下纳米TiO 2和纳米CuO改性蚕丝纤维的实际吸附平衡饱和量分别比空白组高了0.14 g kg和1.04 g kg,计算得到染料吸附的最大值分别比空白组高了5.31 g kg和14.58 g kg,显示了改性蚕丝纤维更优的染色性能。
文摘A new saikosaponin was isolated from Bupleurum chinense DC., and its structure was identified as 3β,16α,23,28,30_pentahydroxy_olean_11,13(18)_dien_3_O_β_D_glucopyranosyl(1→6)_[α_L_rhamnopyranosyl (1→4)]_β_D_glucopyranoside on the basis of chemical and spectral evidence, named as saikosaponin q_1. In addition, two known saikosaponins, 3″_O_acetyl_saikosaponin d and 3″_O_acetyl_saikosaponin b 2, were also isolated and identified from this plant for the first time.
