用紫外 -可见吸收光谱、动态光散射与透射电镜研究紫外光辐射对 Ti O2 溶胶的影响 ,结果表明 ,光辐射使 Ti O2 溶胶在可见光区的吸收减少 ,紫外区吸收增加 ,吸收带隙增大 .与非光辐射的 Ti O2 溶胶粒子相比 ,光辐射使 Ti O2 溶胶粒子分...用紫外 -可见吸收光谱、动态光散射与透射电镜研究紫外光辐射对 Ti O2 溶胶的影响 ,结果表明 ,光辐射使 Ti O2 溶胶在可见光区的吸收减少 ,紫外区吸收增加 ,吸收带隙增大 .与非光辐射的 Ti O2 溶胶粒子相比 ,光辐射使 Ti O2 溶胶粒子分布均匀且平均粒径减小 ,提高了 Ti O2展开更多
The well defined core-shell polymer brush with poly(N-isopropylacrylamide) as shell was investigated by dynamic laser light scattering.Compared with the isolated three-dimensional chain,the grafted PNIPAM chains have ...The well defined core-shell polymer brush with poly(N-isopropylacrylamide) as shell was investigated by dynamic laser light scattering.Compared with the isolated three-dimensional chain,the grafted PNIPAM chains have a broader range in thickness change with a decrease in solvent quality due to the interchain interaction in spherical geometry.With the increasing of the molecule weight of the PNIPAM,the phase transition of grafted chain change from single transition to two stage transition.At T = 250C,the <L>shell can be scale to N as <L>shell∝N0.9±0.1.With increasing of the temperature,the exponential of scaling law of <L>shell and N decrease a little.However,the PNIPAM chains still expand with <L>shell ∝N0.76±0.10 due to the high grafted chain density.展开更多
文摘用紫外 -可见吸收光谱、动态光散射与透射电镜研究紫外光辐射对 Ti O2 溶胶的影响 ,结果表明 ,光辐射使 Ti O2 溶胶在可见光区的吸收减少 ,紫外区吸收增加 ,吸收带隙增大 .与非光辐射的 Ti O2 溶胶粒子相比 ,光辐射使 Ti O2 溶胶粒子分布均匀且平均粒径减小 ,提高了 Ti O2
文摘The well defined core-shell polymer brush with poly(N-isopropylacrylamide) as shell was investigated by dynamic laser light scattering.Compared with the isolated three-dimensional chain,the grafted PNIPAM chains have a broader range in thickness change with a decrease in solvent quality due to the interchain interaction in spherical geometry.With the increasing of the molecule weight of the PNIPAM,the phase transition of grafted chain change from single transition to two stage transition.At T = 250C,the <L>shell can be scale to N as <L>shell∝N0.9±0.1.With increasing of the temperature,the exponential of scaling law of <L>shell and N decrease a little.However,the PNIPAM chains still expand with <L>shell ∝N0.76±0.10 due to the high grafted chain density.
