INRA, UR1268 Biopolymeres Interactions Assemblages , Nantes, France.
Biomacromolecules. 2013 Feb 11;14(2):291-6. doi: 10.1021/bm301871k. Epub 2013 Jan 8.
Cellulose nanocrystals (CNCs) are rod-like colloidal particles that irreversibly adsorb at the oil-water interface to produce ultrastable emulsions. When the internal phase fraction is increased, these CNCs can produce gel-like oil-in-water high internal phase emulsions (HIPEs) in which more than 90% of the hydrophobic phase is stabilized by less than 0.1% wt. of CNCs. However, a one-step preparation of HIPEs is not possible, and incorporation of the high internal phase fraction requires the prior preparation of Pickering emulsions. We propose that this two-step process to create CNC HIPEs relies on a swelling process of the droplets that does not desorb the CNCs from the interface, decreasing the coverage ratio of the droplets and leading to coalescence. As a result, this process leads to a drops deformation and a new interfacial networking organization as revealed by confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM) images.
纤维素纳米晶体（CNCs）是棒状胶体颗粒，它们在油水界面不可逆吸附，从而产生超稳定的乳液。当内相分数增加时，这些 CNC 可以产生凝胶状的油包水高内相乳液（HIPE），其中超过 90%的疏油相由不到 0.1%wt 的 CNC 稳定。然而，一步法制备 HIPE 是不可能的，并且需要预先制备 Pickering 乳液来引入高内相分数。我们提出，制备 CNC HIPE 的两步法过程依赖于液滴的溶胀过程，该过程不会从界面解吸 CNC，从而降低液滴的覆盖比并导致聚结。因此，正如共聚焦激光扫描显微镜（CLSM）和扫描电子显微镜（SEM）图像所揭示的那样，该过程会导致液滴变形和新的界面网络组织。
