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Tailoring the Cavity of Hollow Polyelectrolyte Microgels.
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2019-11-18 , DOI: 10.1002/marc.201900422 Sarah K Wypysek 1 , Andrea Scotti 1 , Mohammed O Alziyadi 2 , Igor I Potemkin 3, 4, 5 , Alan R Denton 2 , Walter Richtering 6
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2019-11-18 , DOI: 10.1002/marc.201900422 Sarah K Wypysek 1 , Andrea Scotti 1 , Mohammed O Alziyadi 2 , Igor I Potemkin 3, 4, 5 , Alan R Denton 2 , Walter Richtering 6
Affiliation
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The authors demonstrate how the size and structure of the cavity of hollow charged microgels may be controlled by varying pH and ionic strength. Hollow charged microgels based on N-isopropylacrylamide with ionizable co-monomers (itaconic acid) combine advanced structure with enhanced responsiveness to external stimuli. Structural advantages accrue from the increased surface area provided by the extra internal surface. Extreme sensitivity to pH and ionic strength due to ionizable moieties in the polymer network differentiates these soft colloidal particles from their uncharged counterparts, which sustain a hollow structure only at cross-link densities sufficiently high that stimuli sensitivity is reduced. Using small-angle neutron and light scattering, increased swelling of the network in the charged state accompanied by an expanded internal cavity is observed. Upon addition of salt, the external fuzziness of the microgel surface diminishes while the internal fuzziness grows. These structural changes are interpreted via Poisson-Boltzmann theory in the cell model.
中文翻译：
定制空心聚电解质微凝胶的腔体。
作者证明了如何通过改变pH值和离子强度来控制空心带电微凝胶腔的大小和结构。基于N-异丙基丙烯酰胺和可电离共聚单体（衣康酸）的带电荷空心凝胶，结合了先进的结构和对外部刺激的增强响应能力。结构上的优势来自额外的内表面所提供的表面积的增加。由于聚合物网络中的可电离部分，对pH值和离子强度的极高敏感性将这些软胶体颗粒与不带电的胶体颗粒区分开来，后者仅在交联密度足够高的情况下才保持中空结构，从而降低了刺激敏感性。利用小角度中子和光散射，观察到在带电状态下网络的膨胀增加，伴随着内部空腔的扩大。加入盐后，微凝胶表面的外部模糊感减少，而内部模糊感则逐渐增加。这些结构变化通过细胞模型中的Poisson-Boltzmann理论进行解释。
更新日期：2019-11-18
中文翻译：
定制空心聚电解质微凝胶的腔体。
作者证明了如何通过改变pH值和离子强度来控制空心带电微凝胶腔的大小和结构。基于N-异丙基丙烯酰胺和可电离共聚单体（衣康酸）的带电荷空心凝胶，结合了先进的结构和对外部刺激的增强响应能力。结构上的优势来自额外的内表面所提供的表面积的增加。由于聚合物网络中的可电离部分，对pH值和离子强度的极高敏感性将这些软胶体颗粒与不带电的胶体颗粒区分开来，后者仅在交联密度足够高的情况下才保持中空结构，从而降低了刺激敏感性。利用小角度中子和光散射，观察到在带电状态下网络的膨胀增加，伴随着内部空腔的扩大。加入盐后，微凝胶表面的外部模糊感减少，而内部模糊感则逐渐增加。这些结构变化通过细胞模型中的Poisson-Boltzmann理论进行解释。
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