Surfactant and polyelectrolyte gel particles for encapsulation and release of aromatic oils.
Surfactant and polyelectrolyte gel particles for encapsulation and release of aromatic oils.
复制标题
用于封装和释放芳香油的表面活性剂和聚电解质凝胶颗粒。
作者：
Y. Lapitsky;E. Kaler
当相反电荷的表面活性剂和聚电解质以接近化学计量比的比例混合时，就会发生缔合相分离。这一行为已被用于生产直径约为100至4000微米的凝胶颗粒。在这里，我们考察了它们作为芳香油聚伞花烃的包埋和释放材料的性能。该凝胶颗粒(直径1500微米)是由分散在十二烷基硫酸钠(十二烷基硫酸钠)和，-三甲基氨衍生物羟乙基纤维素(JR-400)的粘性溶液中的伞花烃液滴滴加到过量十二烷基硫酸钠的凝胶溶液中而制成的。用UV-Vis光谱测定了伞花烃在水溶液(5%十二烷基硫酸钠和4%正戊醇在水中)和有机(异辛烷)溶液中的释放，并用收缩核模型进行了分析。实验数据和模型分析表明，释药速率取决于油在凝胶基质中的有效扩散系数和溶解度，这两者都取决于接收溶液中表面活性剂的存在和凝胶颗粒的膨胀。
Associative phase separation occurs when oppositely charged surfactants and polyelectrolytes are mixed in near-stoichiometric proportions. This behavior has been exploited in the production of gel particles that range between approximately 100 and 4000 µm in diameter. Here, we investigate their performance as materials for the encapsulation and release of the aromatic oil cymene. The gel particles ( 1500 µm in diameter) are prepared by dropwise addition of an oil-in-water suspension made of cymene droplets dispersed in a viscous solution of sodium dodecyl sulfate (SDS) and ,,-trimethylammonium derivatized hydroxyethyl cellulose (JR-400) to a gelling solution of excess SDS. The release of cymene into aqueous (5 wt.% SDS and 4 wt.% pentanol in water) and organic (isooctane) solutions is measured using UV-VIS spectroscopy and analyzed with the shrinking core model. The experimental data and model analysis indicate that the release rate is determined by the effective diffusivity and solubility of the oil in the aqueous gel matrix, both of which depend on the presence of surfactant in the receiving solution, and the swelling of the gel particle.