Heterogeneity in nanocomposite hydrogels from poly(ethylene oxide) cross-linked with silicate nanoparticles.
Heterogeneity in nanocomposite hydrogels from poly(ethylene oxide) cross-linked with silicate nanoparticles.
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DOI：
10.1039/b820452g
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发表时间：
2009-03
期刊：
影响因子：
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通讯作者：
Patrick J. Schexnailder;E. Loizou;L. Porcar;P. Butler;G. Schmidt
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文献类型：
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作者：
Patrick J. Schexnailder;E. Loizou;L. Porcar;P. Butler;G. Schmidt
我们研究了离子强度对纳米复合水凝胶结构异质性和粘弹性的影响。我们使用小角散射和流变学来监测作为离子强度函数的结构变化。离子强度的增加使得纳米复合材料凝胶在宏观上变得不均匀、更硬且更浑浊。在高剪切速率下，纳米结构在聚集体内重新排列并沿流动方向定向。随着离子强度的变化，结构特性发生变化，这是由于纳米颗粒分布和聚合物-纳米颗粒相互作用的不均匀性增加，以及与钠阳离子相互作用的PEO[聚环氧乙烷]聚集体的形成，从而增强了整个水凝胶网络。
We investigate the influence of ionic strength on the structural heterogeneity and viscoelastic properties of nanocomposite hydrogels. We use small-angle scattering and rheology to monitor structural changes as a function of ionic strength. Increasing ionic strength makes the nanocomposite gels macroscopically heterogeneous, stiffer and more turbid. At high shear rates, nanometre structures rearrange within aggregates and orient in the flow direction. The changing structural properties that develop with ionic strength are due to increased heterogeneity of nanoparticle distribution and polymer-nanoparticle interactions as well as to the formation of PEO [poly(ethylene oxide)] aggregates interacting with sodium cations, which reinforce the overall hydrogel network.