Sobczak Grzegorz, Wojciechowski Tomasz, Sashuk Volodymyr
Institute of Physical Chemistry, Polish Academy of Sciences , Kasprzaka 44/52, 01-224 Warsaw, Poland.
Institute of Physics, Polish Academy of Sciences , Al. Lotników 32/46, 02-668 Warsaw, Poland.
Langmuir. 2017 Feb 21;33(7):1725-1731. doi: 10.1021/acs.langmuir.6b04159. Epub 2017 Feb 7.
We present a simple method for the fabrication of colloidal capsules of different sizes ranging from below 100 nm up to one micron. The capsules are produced by self-assembling 5 nm gold nanoparticles at the interface of oil-in-water emulsion droplets. The size of the capsules is regulated by tuning the wetting properties of the nanoparticles by changing either the composition of their ligand shell or the composition of the oil phase. The modified wettability affects not only the size but also the thickness of capsule walls. The wall can be thin if it is made of a single layer of the nanoparticles or thick when composed of multilayers. The durability of such capsules is quite high, although it can be improved by chemical cross-linking with UV light. Such capsules have low permeability, so they can store a molecular cargo and then release it on demand.
我们提出了一种制备不同尺寸胶体胶囊的简单方法，其尺寸范围从低于100纳米到一微米。这些胶囊是通过在水包油乳液滴的界面上自组装5纳米的金纳米颗粒而产生的。通过改变纳米颗粒配体壳的组成或油相的组成来调节纳米颗粒的润湿性，从而调控胶囊的尺寸。改性润湿性不仅影响胶囊的尺寸，还影响胶囊壁的厚度。如果胶囊壁由单层纳米颗粒制成则较薄，由多层纳米颗粒组成则较厚。这种胶囊的耐久性相当高，不过通过紫外线化学交联可进一步提高其耐久性。此类胶囊具有低渗透性，因此它们可以储存分子货物并按需释放。
