Choi Jihyun, Kim Hajeong, Lee Hyunsuk, Yi SeungHwan, Hyun Lee Jin, Woong Kim Jin
School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea.
Research and Innovation Center, AMOREPACIFIC, Yongin 17074, Republic of Korea.
J Colloid Interface Sci. 2023 Jul;641:376-385. doi: 10.1016/j.jcis.2023.03.075. Epub 2023 Mar 15.
Anisotropic particles with a high aspect ratio led to favorable interfacial adhesion, thus enabling Pickering emulsion stabilization. Herein, we hypothesized that pearl necklace-shaped colloid particles would play a key role in stabilizing water-in-silicone oil (W/S) emulsions by taking advantage of their enhanced interfacial attachment energy.
We fabricated hydrophobically modified silica nanolaces (SiNLs) by depositing silica onto bacterial cellulose nanofibril templates and subsequently grafting alkyl chains with tuned amounts and chain lengths onto the nanograins comprising the SiNLs.
The SiNLs, of which nanograin has the same dimension and surface chemistry as the silica nanospheres (SiNSs), showed more favorable wettability than SiNSs at the W/S interface, which was supported by the approximately 50 times higher attachment energy theoretically calculated using the hit-and-miss Monte Carlo method. The SiNLs with longer alkyl chains from C6 to C18 more effectively assembled at the W/S interface to produce a fibrillary interfacial membrane with a 10 times higher interfacial modulus, preventing water droplets from coalescing and improving the sedimentation stability and bulk viscoelasticity. These results demonstrate that the SiNLs acted as a promising colloidal surfactant for W/S Pickering emulsion stabilization, thereby allowing the exploration of diverse pharmaceutical and cosmetic formulations.
高纵横比的各向异性颗粒可实现良好的界面粘附，从而实现皮克林乳液的稳定。在此，我们假设珍珠项链状胶体颗粒通过利用其增强的界面附着能，在稳定硅油包水（W/S）乳液中发挥关键作用。
我们通过将二氧化硅沉积在细菌纤维素纳米原纤维模板上，随后将具有不同数量和链长的烷基链接枝到构成硅纳米带（SiNLs）的纳米颗粒上，制备了疏水改性的硅纳米带。
纳米颗粒与二氧化硅纳米球（SiNSs）具有相同尺寸和表面化学性质的SiNLs，在W/S界面处表现出比SiNSs更有利的润湿性，这一点通过使用命中与未命中蒙特卡罗方法理论计算得出的附着能高出约50倍得到了支持。具有从C6到C18较长烷基链的SiNLs在W/S界面处更有效地组装，形成具有高10倍界面模量の纤维状界面膜，防止水滴聚结，并提高沉降稳定性和本体粘弹性。这些结果表明，SiNLs作为一种有前途的胶体表面活性剂，可用于稳定W/S皮克林乳液，从而有助于探索各种药物和化妆品配方。
