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SCIENTIA SINICA Chimica, Volume 49, Issue 4: 619-624(2019) https://doi.org/10.1360/N032018-00198

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

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  • ReceivedAug 26, 2018
  • AcceptedOct 11, 2018
  • PublishedJan 16, 2019

Abstract

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.


Funded by

国家重点研发计划纳米科技重点专项(2016YFA0200300)


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  • Figure 1

    SEM images of the silk scarf (a, b), full grain cattle leather (c, d), and wallpaper base paper (e, f) samples (color online).

  • Figure 2

    Pore size distribution measured by the mercury intrusion porosimetry (MIP) for silk scarf (a), full grain cattle leather (b), and wallpaper base paper (c). The values above the curve are the most probable pore diameters (color online).

  • Figure 3

    SEM images of SiO2-loaded silk scarfs. (a) 20 nm SiO2; (b) 100 nm SiO2; (c) 500 nm SiO2; (d) 1000 nm SiO2. The dispersion concentration of SiO2 is 0.1 mg/mL; others are the same as those described in the footnote of Table 1.

  • Figure 4

    SEM images of SiO2-loaded leathers. The inset of (a) displays the EDS photo showing the distribution of silicon elements in the corresponding domain. (a, d) 20 nm SiO2; (b, e) 100 nm SiO2; (c, f) 1000 nm SiO2. Absorption experiments were conducted under the conditions as described in Figure 3 (color online).

  • Figure 5

    SEM images of SiO2-loaded wallpaper base papers. (a) 20 nm SiO2; (c) 100 nm SiO2; (b, d) partial enlarged images of (a) and (c), respectively; (e) 500 nm SiO2; (f) 1000 nm SiO2. Absorption experiments were conducted under the conditions as described in Figure 3.

  • Table 1   Structural parameters for three kinds of substrate samples obtained from the SEM and MIP measurements

    基材

    单纤维

    比表面积(m2/g)

    孔径分布

    孔隙率(%)

    直径(μm)

    表面形貌

    孔径(μm)

    缝隙宽度<1 μm的空隙百分比(%)

    丝巾

    8~15

    光滑、致密

    0.4~0.5

    15~100

    0.3

    ~60

    皮革

    0.1~0.14

    光滑、致密

    4~10

    0.1~30

    23.8 (<0.1 μm, 1.6%)

    70~80

    原纸

    4~40

    皱褶、裂隙

    1~3.5

    1~30

    4

    55~60

  • Table 2   Amounts of silica particles absorbed on silk scarfs

    SiO2粒径(nm)

    SiO2吸附量(wt%) b)

    SiO2粒子数/g样品

    未漂洗

    漂洗后

    未漂洗

    漂洗后

    20

    0.69

    0.35

    9.35×1013

    4.77×1013

    100

    0.79

    0.62

    8.55×1011

    6.76×1011

    500

    0.82

    0.67

    7.14×109

    5.79×109

    1000

    1.07

    0.90

    1.16×109

    9.76×108

    SiO2分散液浓度为1 mg/mL; 样品浸泡1 h, 漂洗1 h. 详见实验部分. b) 根据热重分析确定

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