Phase inversion of TiO2 nanoparticle stabilized emulsions of alkenyl succinic anhydride
Phase inversion of TiO2 nanoparticle stabilized emulsions of alkenyl succinic anhydride
复制标题
TiO2 纳米颗粒稳定的烯基琥珀酸酐乳液的相转化
DOI：
10.1016/j.ces.2012.10.025
复制
发表时间：
2013-01
影响因子：
4.7
通讯作者：
Haidong Li
中科院分区：
文献类型：
--
作者：
Zhenhuan Zhao;Wenxia Liu;Zongyin Liu;Pengxiang Ding;Haidong Li
烯基琥珀酸酐(ASA)是一种粘性极性油，通常在乳化后用作纸张施胶剂。将水相加入到油相中，制备了纳米二氧化钛稳定的水乳剂和水乳剂。通过监测不同均化速度、不同初始颗粒位置和不同颗粒浓度下乳化液电导率随水质量分数的变化，研究了从w/o到w/w或w/o/w的灾难性相变。当纳米二氧化钛最初分散在水中时，它携带正电荷，并在水-水解液界面上与水解液发生相互作用。因此，颗粒被疏水修饰，导致在较高水质量分数时从w/o转变为w/o/w，而对于起源于ASA的颗粒，在较低水质量分数时，相转变为w/o/w。较高的均化速度和较低的颗粒浓度在较低的水质量分数时会导致相变。此外，当颗粒起源于水中时，均一速度和颗粒浓度引起的相变点的变化被放大。与通过灾难性乳化过程制备的非离子表面活性剂稳定的乳液类似，含有ASA的粒子稳定的乳液在接近发生相变的水质量分数时，液滴尺寸变小。与最初分散在水中的乳状液相比，初始分散在ASA中的乳状液的液滴尺寸略小。此外，相变点附近的液滴尺寸随颗粒浓度变化不明显。
Alkenyl succinic anhydride (ASA) is a viscous polar oil, typically used as a paper sizing agent after being emulsified. ASA and water emulsions stabilized by TiO2nanoparticles were prepared by adding the aqueous phase to the oil phase. Catastrophic phase inversion from w/o to o/w or w/o/w has been investigated by monitoring the variation of emulsion conductivity with water mass fraction at different homogenization speeds, initial particle locations and particle concentrations. When initially dispersed in water, TiO2nanoparticles carry positive charge and interact with hydrolyzed ASA at the water–ASA interface. The particles are thus hydrophobically modified, resulting in phase inversion from w/o to w/o/w at higher water mass fraction, while for particles originating in ASA, the phase inverts from w/o to o/w at a lower water mass fraction. Higher homogenization speed and lower particle concentration induce phase inversion at lower water mass fractions. In addition, variations in the phase inversion point caused by the homogenization speed and particle concentration are magnified when the particles originate in water. Similar to non-ionic surfactant-stabilized emulsions prepared by a catastrophic emulsification process, the particle-stabilized emulsions containing ASA exhibit a diminished drop size when approaching the water mass fraction at which phase inversion occurs. Emulsions with the particles initially dispersed in ASA have a slightly smaller drop size than those with particles initially dispersed in water. In addition, the drop size near the phase inversion point did not obviously change with particle concentration.
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影响因子：
3.9
作者：
S. Simović;C. Prestidge
通讯作者：
S. Simović;C. Prestidge
影响因子：
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作者：
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影响因子：
3.3
作者：
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通讯作者：
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DOI：
--
发表时间：
2009
期刊：
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影响因子：
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作者：
Liu Wen-xia
通讯作者：
Liu Wen-xia
影响因子：
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作者：
Fei Yang;Shangying Liu;Jian Xu;Q. Lan;Fang Wei;Dejun Sun
通讯作者：
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