Stabilization of nonaqueous foam with lamellar liquid crystal particles in diglycerol monolaurate/olive oil system
Stabilization of nonaqueous foam with lamellar liquid crystal particles in diglycerol monolaurate/olive oil system
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DOI：
10.1016/j.jcis.2008.08.051
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发表时间：
2008-12-01
影响因子：
9.9
通讯作者：
Aramaki, Kenji
中科院分区：
文献类型：
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作者：
Shrestha, Lok Kumar;Shrestha, Rekha Goswami;Aramaki, Kenji
本发明提供了在双甘油单月桂酸酯（命名为C（12）G（2））/橄榄油体系中通过层状液晶（L-α）分散体稳定的非水性泡沫。系统地研究了发泡性和泡沫稳定性随组成的变化规律，以及添加水对非水发泡行为的影响。结果表明，C（12）G（2）浓度从1%增加到3%，发泡性增加，然后随浓度的增加而降低，但泡沫稳定性随浓度的增加而增加。取决于成分，泡沫稳定几分钟到几小时。10wt%C（12）G（2）/橄榄油体系产生的泡沫稳定性大于6 h。研究了添加水对5wt%C（12）G（2）/橄榄油体系发泡性能的影响，发现添加1wt%的水时，5wt%C（12）G（2）/橄榄油体系的发泡性和泡沫稳定性降低，但随着水含量的进一步增加，发泡性和泡沫稳定性均增加。添加10%水的体系的泡沫稳定性约为4 h。橄榄油中C（12）G（2）的相行为研究表明，在25 ℃时，L-α粒子在稀相区分散。因此，C（12）G（2）/橄榄油体系中的稳定泡沫可以归因于L-alpha粒子，其吸附在气-液界面处，如表面张力测量和光学显微镜所证实的。激光衍射粒度分析仪表明，平均粒径随C（12）G（2）浓度的增加而减小，因此，泡沫在较高的表面活性剂浓度下更稳定。从发泡试验、光学显微照片和颗粒尺寸判断，可以得出结论，在所研究的体系中稳定的非水泡沫主要由L-α颗粒的分散引起，并且泡沫稳定性根据颗粒尺寸有很大不同。(C)2008年爱思唯尔公司All rights reserved.
Nonaqueous foams stabilized by lamellar liquid crystal (L-alpha) dispersion in diglycerol monolaurate (designated as C(12)G(2))/olive oil systems are presented. Foamability and foam stability depending on composition and the effects of added water on the nonaqueous foaming behavior were systematically studied. It was found that the foamability increases with increasing C(12)G(2) concentration from 1 to 3 wt% and then decreases with further increasing concentration, but the foam stability increases continuously with concentration. Depending on compositions, foams are stable for a few minutes to several hours. Foams produced by 10 wt% C(12)G(2)/olive oil system are stable for more than 6 h. In the study of effects of added water on the foaming properties of 5 wt% C(12)G(2)/olive oil system, it was found that the foamability and foam stability of 5 wt% C(12)G(2)/olive oil decreases upon addition of 1 wt% water, but with further increasing water, both the foamability and foam stability increase. Foams with 10% water added system are stable for similar to 4 h. Phase behavior study of the C(12)G(2) in olive oil has shown the dispersion of L-alpha particles in the dilute regions at 25 degrees C. Thus, stable foams in the C(12)G(2)/olive oil system can be attributed to L-alpha particle, which adsorb at the gas-liquid interface as confirmed by surface tension measurements and optical microscopy. Laser diffraction particle size analyzer has shown that the average particle diameter decreases with increasing the C(12)G(2) Concentration and, hence, the foams are more stable at higher surfactant concentration. judging from foaming test, optical micrographs, and particle size, it can be concluded that stable nonaqueous foams in the studied systems are mainly caused by the dispersion of L-alpha particles and depending on the particle size the foam stability largely differs. (C) 2008 Elsevier Inc. All rights reserved.