Microrheology of polymeric solutions using x-ray photon correlation spectroscopy
Microrheology of polymeric solutions using x-ray photon correlation spectroscopy
复制标题
使用 X 射线光子相关光谱研究聚合物溶液的微观流变学
DOI：
10.1088/0953-8984/17/25/l06
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
A. Madsen
中科院分区：
文献类型：
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作者：
A. Papagiannopoulos;T. Waigh;A. Fluerasu;C. Fernyhough;A. Madsen
我们使用胶体二氧化硅探针在不透明聚合物溶液（1-20% w/w）上演示了XPCS微流变学技术。强度相关函数的短时间衰减提供了胶体探针的均方位移（MSD）。探针的msd随后使用广义Stokes-Einstein方程进行转换，从而可以计算出生物聚合物（结冷胶）和合成聚电解质（聚苯乙烯磺酸盐，PSS）的线性粘弹性光谱，其频率超过20年。可以测量的msd比视频粒子跟踪微流变学可能测量的msd小两个数量级，对于~ nms位移的灵敏度为~ 10 nms−1。水、甘油和PSS梳子的XPCS数据与在较低聚合物浓度下进行的视频颗粒跟踪微流变学实验一致。
We demonstrate the technique of XPCS microrheology on opaque polymeric solutions (1–20% w/w) using colloidal silica probes. The short time decay of the intensity correlation function provides the mean square displacement (MSD) of the colloidal probes. The MSDs of the probes are subsequently transformed using the generalized Stokes–Einstein equation, allowing the linear viscoelastic spectra of a biopolymer (gellan) and a synthetic polyelectrolyte (polystyrene sulfonate, PSS) to be calculated over two decades of frequency. MSDs can be measured that are two orders of magnitude smaller than those possible with video particle tracking microrheology, with a sensitivity of ∼10 nm s−1 for displacements of ∼nms. The XPCS data for water, glycerol and PSS combs are in agreement with video particle tracking microrheology experiments performed at lower polymer concentrations.