蚕丝织品、牛皮革和壁纸原纸的纤维孔隙结构及吸附性能

香料的纳米化封装及相关的芳香整理技术已经成为有效实现香气物质缓慢释放的重要手段.因此,了解纳米载体与基材之间的相互作用机制对于香料纳米技术的应用和改进至关重要.本文以蚕丝织品、牛皮革和壁纸原纸为对象,综合运用多种表征技术分析,研究了3种基材的纤维形貌、孔隙结构及孔径分布的基本特征,并以4种不同直径的纳米二氧化硅(SiO2)作为模型载体考察其在上述基材上的吸附行为.结果表明, 3种基材缝隙宽度小于1μm的孔隙百分比有显著差异,丝巾、皮革、原纸分别为0.3%、23.8%和4%,与其比表面积呈正相关的关系.纳米载体在基材上的附着强度及其分布状态不仅依赖于载体自身的尺寸,而且与纤维的物质属性及孔隙结构密切相关.小粒径SiO_2粒子(20 nm)可牢固附着于单根纤维表面,随粒径增大则倾向于嵌入到纤维缝隙或黏附在缝隙边缘.本研究对于纳米香料递送体系的设计具有一定的理论指导意义.

Fibrous pore structure of silk fabric,cattle leather and wallpaper base paper and their adsorption properties

In recent years, encapsulation of fragrances and flavors in nanostructured matrices as well as related aromatic finishing techniques have emerged as promising means for achieving significant improvement of long-term release of flavor essence;therefore, understanding the interaction mechanism between nanocarriers and substrates is of vital importance for the application of fragrance nanotechnologies. In this work, the morphology, pore structure and pore size distribution of three kinds of animal and plant fiber materials were studied by taking silk fabric, cattle leather and wallpaper base paper as objects. Then, we investigated the adsorption property of the abovementioned fibrous substrates utilizing silica nanoparticles with different diameters as a simple model carrier. The results demonstrated that the adhesion strength and distribution of nanoparticles on the substrate are heavily dependent on their own size as well as on the fiber nature and the pore structure. Silica particles with a diameter of 20 nm can be strongly adsorbed on the fiber surface. For larger particles, such as 100, 500 and 1000 nm in diameters, they tend to be embedded in the gaps of the fiber or attached to the edge of the gaps. The preliminary studies could provide theoretical support for the design of fragrance-loaded nanoparticles and the development of long-lasting aromatic products.