Interfacial Properties of Chitosan in Interfacial Shear and Capsule Compression.,ACS Applied Materials & Interfaces

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Interfacial Properties of Chitosan in Interfacial Shear and Capsule Compression.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-09-13 , DOI: 10.1021/acsami.0c11781
Matthew D Biviano ₁ , Lukas J Böni ₂ , Joseph D Berry ₁ , Peter Fischer ₂ , Raymond R Dagastine ₁

Affiliation

The time-dependent behavior of surface-active adsorption layers at the oil/water interface can dictate emulsion behavior at both the micro- and macroscale. In addition, self-healing behavior of the adsorption layer may benefit emulsion stability subject to large deformation under processing or during final application. We explore the behavior of chitosan, a known hydrophilic emulsifier, which forms nanoparticle aggregates when the concentration of acetate buffer exceeds 0.3 M. We observe a Pickering adsorption layer building and strain-dependent behavior of the chitosan at the medium chain triglyceride oil/water interface. We compare this to the behavior of identical chitosan layers coated on oil droplets via atomic force microscopy colloidal probe compression in both linear and oscillatory compressions. In both interfacial shear rheometry and the capsule compression, a thick, elastic layer with strong time-dependent recovery behavior is observed, suggesting that the layer has some self-healing capabilities.

中文翻译：

壳聚糖在界面剪切和胶囊压缩中的界面性质。

油/水界面处的表面活性吸附层的时间依赖性行为可以决定微观和宏观范围内的乳液行为。另外，吸附层的自修复行为可能有益于乳液稳定性，该乳液在加工过程中或最终涂覆过程中会发生较大变形。我们探索了一种已知的亲水性乳化剂壳聚糖的行为，该壳聚糖在乙酸盐缓冲液的浓度超过0.3 M时会形成纳米颗粒聚集体。我们观察到壳聚糖在中链甘油三酸酯油/水界面处的皮克林吸附层的建立和应变依赖性行为。我们将其与通过油滴涂覆的相同壳聚糖层的行为进行比较原子力显微镜在线性和振荡压缩中均采用胶体探针压缩。在界面剪切流变学和胶囊压缩中，均观察到厚的弹性层具有很强的时间依赖性恢复行为，这表明该层具有一定的自我修复能力。

更新日期：2020-10-21

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