Rheological modification of partially oxidised cellulose nanofibril gels with inorganic clays.
Rheological modification of partially oxidised cellulose nanofibril gels with inorganic clays.
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DOI：
10.1371/journal.pone.0252660
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发表时间：
2021
期刊：
影响因子：
3.7
通讯作者：
Edler KJ
中科院分区：
文献类型：
--
作者：
Bryant SJ;Calabrese V;da Silva MA;Zakir Hossain KM;Scott JL;Edler KJ
这项研究旨在量化粘土和部分氧化的纤维素纳米纤维(OCNF)对凝胶的影响，并表征它们的物理和化学相互作用。与OCNF混合形成剪切稀释胶，在整个剪切范围内比单独使用OCNF的粘度更高。使用不同类型、不同浓度(0.5-2wt%)的粘土可以微调粘度和其他流变性。磷灰石颗粒比蒙脱石的颗粒小一个数量级(半径为150ä，而蒙脱石的半径为2000ä)，因此能够促进纤维素纤维的联网，从而对流变性产生更强的影响，包括更高的粘度。这项工作提出了一种使用可再生和环保的纳米纤维素和粘土来改变流变性的机制，这些粘土可以用于各种工业产品，包括家用和个人护理配方。
This study aimed to quantify the influence of clays and partially oxidised cellulose nanofibrils (OCNF) on gelation as well as characterise their physical and chemical interactions. Mixtures of Laponite and montmorillonite clays with OCNF form shear-thinning gels that are more viscous across the entire shear range than OCNF on its own. Viscosity and other rheological properties can be fine-tuned using different types of clay at different concentrations (0.5–2 wt%). Laponite particles are an order of magnitude smaller than those of montmorillonite (radii of 150 Å compared to 2000 Å) and are therefore able to facilitate networking of the cellulose fibrils, resulting in stronger effects on rheological properties including greater viscosity. This work presents a mechanism for modifying rheological properties using renewable and environmentally-friendly nanocellulose and clays which could be used in a variety of industrial products including home and personal care formulations.
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