Kwon Jaeyeong, Kim Minji, Kim You-Jin, Oh Heemuk, Lee Jun Bae, Yi Gi-Ra, Lee Hyomin
Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongsangbuk-do, 37673, South Korea.
Innovation Lab., Cosmax R&I Center, 255 Pangyo-ro, Bundang-gu, Seongnam, Gyeonggi, 13486, South Korea.
Small. 2025 Jan;21(2):e2402577. doi: 10.1002/smll.202402577. Epub 2024 Sep 16.
Pickering emulsifiers have gained significant interest as alternatives for conventional surfactants in various applications that includes pharmaceutics, food, homecare products, and cosmetics. However, their function is primarily focused on enhancing emulsion stability of which still remains to be resolved. Herein, Janus multipods are presented that simultaneously shield UV while offering high emulsion stability. These particles are prepared by growing multiple silicon dioxide (SiO) nanopods using sol-gel method on a spherical titanium dioxide (TiO) core with a thin SiO shell. The incorporation of high refractive index TiO in the core is shown to effectively shield UV while the SiO shell suppresses the photocatalytic activity. Moreover, by utilizing wax colloidosomes as templates, these multipod nanoparticles are further modified to exhibit Janus characteristics. This leads to strong adsorption of the Janus multipods at the oil/water emulsion interface where the multipod feature additionally reinforces the interfacial stabilization by interdigitation and interlocking of the Janus multipods to suppress detachment of the highly dense particles from the interface. As these Janus multipods offer effective UV protection as well as excellent emulsion stability, it is envisioned that they have great potential in advanced cosmetic formulations which require both enhanced sunscreen performance and better feeling in skincare products.
皮克林乳化剂作为传统表面活性剂的替代品，在包括制药、食品、家居护理产品和化妆品在内的各种应用中引起了广泛关注。然而，它们的功能主要集中在提高乳液稳定性方面，而这一问题仍有待解决。在此，我们展示了一种兼具屏蔽紫外线和高乳液稳定性的Janus多足体。这些颗粒是通过溶胶-凝胶法在具有薄二氧化硅（SiO）壳的球形二氧化钛（TiO）核上生长多个二氧化硅（SiO）纳米足体制备而成。核中高折射率TiO的掺入显示出能有效屏蔽紫外线，而SiO壳则抑制了光催化活性。此外，通过使用蜡质胶体囊泡作为模板，这些多足纳米颗粒被进一步修饰以呈现Janus特性。这导致Janus多足体在油/水乳液界面处强烈吸附，其中多足特征通过Janus多足体的相互交叉和联锁进一步增强了界面稳定性，从而抑制高密度颗粒从界面分离。由于这些Janus多足体提供了有效的紫外线防护以及出色的乳液稳定性，预计它们在需要增强防晒性能和改善护肤品使用感受的高级化妆品配方中具有巨大潜力。
