کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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6469420 | 1423893 | 2017 | 7 صفحه PDF | دانلود رایگان |
- Proved the concentration-dependent dye aggregation in LbL-assembly, providing a new strategy for the applications of dyes on textiles.
- Enhanced H-aggregates of FITC in LbL-assembled films on cotton by increasing or decreasing the PAH-FITC concentration.
- Inhibited the H-aggregates in the PAH-FITC films prepared by a multi-immersion.
In this work, we prepared layer-by-layer (LbL) assembled films of fluorescein isothicyanate labeled poly(allylamine hydrochloride) (PAH-FITC) and poly(acrylic acid) (PAA) on cotton fabrics, and researched the influence of the PAH-FITC concentration on the FTIC aggregation. With the LbL assembly, the ratio of FITC dimers to monomers in films approached a constant that was decided by the deposition situation of PAH-FITC on cotton. The concentration increase of the PAH-FITC solution induced more FTIC dyes to deposit on fabrics, thus generating a higher degree of H-aggregation. Interestingly, as the PAH-FITC concentration decreased, a high content of FITC dimers was obtained in LbL-assembled films as well. The possible reason is the excessive PAA in LbL films made the counter PAH-FITC chains coil overlap, increasing the aggregation degree. Additionally, the H-aggregates with weak fluorescence were effectively inhibited in PAH-FITC films, which were prepared by a multi-immersion in the PAH-FITC solution. This work shows the concentration-dependent dye aggregation in LbL-assembly, providing a new strategy for the applications of dye molecules on fabrics.
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Journal: Dyes and Pigments - Volume 142, July 2017, Pages 358-364