Using cellulose nanofibers isolated from waste hop stems to stabilize dodecane or olive oil-in-water Pickering emulsions
Using cellulose nanofibers isolated from waste hop stems to stabilize dodecane or olive oil-in-water Pickering emulsions
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DOI：
10.1016/j.colsurfa.2022.129956
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发表时间：
2022-08
期刊：
影响因子：
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通讯作者：
Noriko Kanai;Takahiro Sakai;Kohei Yamada;Sari Kumagai;I. Kawamura
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作者：
Noriko Kanai;Takahiro Sakai;Kohei Yamada;Sari Kumagai;I. Kawamura
从农业废弃物酒花茎中分离出TEMPO氧化纤维素纳米纤维（TOCNF），并将其用作水包油型Pickering乳液的稳定剂。使用两种类型的油（十二烷和橄榄油）、不同的TOCNF浓度（连续相中为0.5%、0.8%和1.0%）和多种油/水比（10-30%油重量）制备TOCNF稳定的乳液。研究了十二烷/TOCNF（d-CNF）和橄榄油/TOCNF（o-CNF）乳液在室温下一个月的稳定性。虽然d-CNF和o-CNF乳液的不稳定性行为不同，但它们的稳定性随着TOCNF浓度和/或较低的油比而增强。添加高于0.8%的TOCNF通过充分覆盖油/水界面并在连续相中形成缠结结构来防止分离一个月。d-CNF乳液中油滴的平均直径（dv）为5-14 µm，取决于初始TOCNF加载量。对于o-CNF乳液，dv相对小于d-CNF（3-8 μm），并且絮凝和奥斯特瓦尔德熟化被认为在o/w 10/90下占主导地位，显示单峰液滴尺寸分布，而聚结也在o/w 20/80下起作用，显示双峰分布。
TEMPO-oxidized cellulose nanofibers (TOCNF) were isolated from agricultural waste hop stems and used as stabilizers of oil-in-water Pickering emulsions. The TOCNF-stabilized emulsions were prepared using two types of oils (dodecane and olive oil), different TOCNF concentrations (0.5%, 0.8%, and 1.0% in the continuous phase), and multiple oil/water ratios (10–30% oil by weight). The stability of dodecane/TOCNF (d-CNF) and olive oil/TOCNF (o-CNF) emulsions were investigated over one month at ambient temperature. While the instability behavior in d-CNF and o-CNF emulsions was different, their stabilities were enhanced with TOCNF concentrations and/or the lower oil ratios. The addition of TOCNF above 0.8% prevented separation for one month by sufficiently covering the oil/water interface and forming the entangled structure in the continuous phase. The mean diameter of oil droplets (dv) in d-CNF emulsions was 5–14 µm, depending on the initial TOCNF loading. As for o-CNF emulsions,dvwas relatively smaller than that of d-CNF (3–8 µm), and flocculation and Ostwald ripening were considered to dominate the destabilization at o/w 10/90 showing a monomodal droplet size distribution, while coalescence also contributed at o/w 20/80, showing a bimodal distribution.