Xin-Jun Zhao, Jiu-Zhi Li, Ming-Yun Shi, Chao Ma. Effect of thiocyanate anions on switching of poly (N-isopropylacrylamide) tethered to nanoparticle surface [J]. Acta Physica Sinica, 2019, 68(21): 214701-1
- Acta Physica Sinica
- Vol. 68, Issue 21, 214701-1 (2019)
Fig. 1. Schematic representation of the PNIPAM tethered to nanoparticle surface. Bonding between PNIPAM and SCN– by formation of P—S bonds.
接枝在纳米粒子表面的PNIPAM球面刷系统(其中SCN–通过P—S键与PNIPAM结合)
Fig. 2. Height of the grafted PNIPAM brushes as a function of temperature. The P—S bond energetic gain is chosen as
, and the entropic loss is given by
. The surface coverage is
.
接枝在纳米粒子表面的PNIPAM球面刷高度随温度的变化关系(其中结合能参数为
, 熵的损失为
,
, 接枝密度为
)
Fig. 3. Local fraction of P—S bond as a function of SCN– concentration at a given temperature of T = 31 ℃. All parameters are the same as those in Fig. 2 .
P—S 键分数在垂直纳米粒子表面方向的分布(其中温度T = 31 ℃, 其余参数与图2 相同)
Fig. 4. Electrostatic potential as a function of the distance from the surface at different thiocyanate anion concentrations at a given temperature of T = 31 ℃. All parameters are the same as those in Fig. 2 体系静电势在距离垂直纳米粒子表面方向的分布(温度T = 31 ℃, 其余参数与图2 相同)
Fig. 5. Average volume fractions of the grafted PNIPAM chains as a function of the distance from the surface for C = 750 mmol: (a)
; (b)
. All parameters are the same as those in Fig. 2 C = 750 mmol时PNIPAM分子链单体的平均体积分数在垂直纳米粒子表面方向的分布 (a)
(b)
; 其余参数与图2 相同
Fig. 6. Height of the grafted PNIPAM brushes as a function of temperature at C = 750 mmol. The
– 2.25 + 95/ T . All parameters are the same as those in Fig. 2 .
C = 750 mmol时PNIPAM球面刷高度随温度的变化(其中
, 其余参数与图2 相同)
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