Institute for Color Science and Technology with scientific cooperation of Iran Color Society Journal of Color Science and Technology 1735-8779 18 1 2024 02 20 Mechanism of Acid Dyes Adsorption on Silk Yarn Modified with β-Cyclodextrin Nanostructure Mechanism of Acid Dyes Adsorption on Silk Yarn Modified with β-Cyclodextrin Nanostructure 37 55 82002 FA Samera Salimpour Abkenar Research Group of Traditional Arts, Research Institute of Cultural Heritage and Tourism (RICHT), P. O. Box: 1343711167, Tehran, Iran Reza Mohammad Ali Malek Department of Textile Engineering, Amirkabir University of Technology, P. O. Box: 158754413, Tehran, Iran 0000-0002-3389-4691 Negar Daeichini Department of Textile Engineering, Amirkabir University of Technology, P. O. Box: 158754413, Tehran, Iran Journal Article 2024 01 10 <em>This research modified the degummed silk yarn with β-cyclodextrin (β-CD) using Succinic acid (SUA). Then, the modified silk yarn was dyed with three different acid dyes through usual (with acid) and unusual (without acid) methods. The surface modification and inclusion complex were characterized by well-known analyses such as Fourier transform infrared (FTIR), attenuated total reflectance-FTIR (ATR-FTIR), Scanning electron microscope (SEM), X-ray diffraction (XRD), and UV-visible. Results show that the presence of the β-CD has markedly enhanced the dye adsorption, and also, the acid has an effective role in the dye adsorption mechanism. The improvement of dye adsorption can be related to chemical (H-bonding and ionic) and physical (inclusion complex and encapsulation into tridimensional polymeric network) interactions. In addition, the β-CD had no negative effect on the color fastness (wash, light, and rubber) of the modified silk samples, so the color fastness of most samples remained unchanged or did not show a noticeable decrease.</em> <em>This research modified the degummed silk yarn with β-cyclodextrin (β-CD) using Succinic acid (SUA). Then, the modified silk yarn was dyed with three different acid dyes through usual (with acid) and unusual (without acid) methods. The surface modification and inclusion complex were characterized by well-known analyses such as Fourier transform infrared (FTIR), attenuated total reflectance-FTIR (ATR-FTIR), Scanning electron microscope (SEM), X-ray diffraction (XRD), and UV-visible. Results show that the presence of the β-CD has markedly enhanced the dye adsorption, and also, the acid has an effective role in the dye adsorption mechanism. The improvement of dye adsorption can be related to chemical (H-bonding and ionic) and physical (inclusion complex and encapsulation into tridimensional polymeric network) interactions. In addition, the β-CD had no negative effect on the color fastness (wash, light, and rubber) of the modified silk samples, so the color fastness of most samples remained unchanged or did not show a noticeable decrease.</em> https://jcst.icrc.ac.ir/article_82002_30d2630df8283bdbadedfffe25ad830e.pdf