Browsing by Author "Islam, S.R."

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    Fabrication of nanoparticle-reinforced composite hydrogel for improved durability, antifouling, and thrombosis-resistance in arteriovenous grafts
    (Elsevier B.V., 2024-03-25) Dawit, H.; Mehmood, S.; Hussain, Z.; Islam, S.R.; Wang, Z.; Cao, Y., Liu, X.; Wang, Z.; Pei, R.
    Arteriovenous grafts are routinely designed to provide a deliberate connection between an artery and vein in patients during hemodialysis. The commonly used grafts present significant drawbacks such as thrombosis, bacterial infection, and biofouling which prevents their functionality. To endow hydrogels with improved anti-thrombosis, stable antifouling, and strong mechanical strength, a surface-modified nanoparticle-reinforced nanohybrid hydrogel is developed. In brief, zwitterionic sulfobetaine methacrylate (SBMA) is coated on bentonite clay (BC) nanoparticles via a simple method. BC-SBMA nanoparticles were then loaded onto sodium alginate /polyvinyl alcohol hydrogel composite. Calcium chloride (Ca2+) crosslinking is employed to form stable network and optimize polyvinyl alcohol/sodium alginate (PS) hydrogel composite. BC-SBMA particles were dispersed into PS hydrogel and crosslinked to form nanohybrid hydrogel (PS@BC-SBMA). The nanohybrid hydrogel was characterized for its morphological, mechanical, physicochemical, antibacterial, biocompatibility, antifouling, ex-vivo anti-thrombogenic, and in-vivo anti-inflammatory properties. The results revealed that the presence ofBC-SBMA particles boosted the mechanical strength and facilitated biocompatibility. The presence of zwitterionic polymers provided excellent antifouling properties toward blood platelets, unnecessary proteins, and bacterial strains. Hence, the cooperative effects of the nanohybrid hydrogel such as biocompatibility, antifouling, and mechanical properties lead to a desirable candidate for blood-contacting implants.
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    Sustainable Coloration and Functionalization of Silk Fabric Through Chinese Fringe Leaves (Loropetalum chinense) Extraction Using the Taguchi Method: An Alternative for Waste Managemen
    (Korean Fiber Society, 2025-01-26) Hossain, M.S.,; Islam, S.R.; Zhou, Y.; Khan, A.; Saeed, H.A.M.
    The escalating concern over the environmental impact of synthetic dyes in the textile industry has fueled a burgeoning interest in natural alternatives. This study aims to investigate the dyeing performance of silk fabric using dye extracted from Chinese fringe leaves (Loropetalum chinense), which are devoid of harmful chemicals, and to promote eco-friendly practices. The extraction process involved normal heating with crushed leaves, ensuring a purely natural dyeing method. Through experimentation, it was observed that higher dyeing temperatures, increased dye ratios, and longer dyeing durations enhanced color strength in the silk fabric treated with the Chinese fringe leaves dye. An orthogonal (L16) Taguchi method was applied to determine the optimal dyeing conditions, emphasizing the significance of dye dosage and temperature in achieving maximum color strength. The initial parameter of K/S was 11.3 and the predicted parameter of K/S was 11.43, where the confirmation test value of K/S was 11.49 for the dyed fabric sample. Moreover, assessments of color fastness demonstrated satisfactory results ranging from good to excellent for washing, perspiration, rubbing, and light fastness. Fourier transform infrared analysis elucidated the interaction between dye molecules and silk fabric while scanning electron microscopy revealed the dye absorption by the silk fabric's surface. Thermogravimetric analysis revealed differences in thermal properties between dyed and undyed silk fabric, with dyed fabric exhibiting lower melting points and reduced thermal stability. Additionally, the dyed silk fabric exhibited decreased air permeability of 122 ± 2 mm/s with an increased protection factor of 317.9 against UV and sun rays compared to its undyed silk fabric sample. In inference, the dye extracted from Chinese fringe leaves possessed a favorable affinity for silk fabric, presenting a promising alternative to synthetic dyes for sustainable coloration and functionalization in the textile industry.