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Electrospun Implantable Conducting Nanomaterials
Published in K.M. Praveen, Rony Thomas Murickan, Jobin Joy, Hanna J. Maria, Jozef T. Haponiuk, Sabu Thomas, Electrospun Nanofibers from Bioresources for High-Performance Applications, 2023
Fahimeh Roshanfar, Zohre Mousavi Nejad, Neda Alasvand, K. Anand
PANi has been widely used in bone tissue engineering applications to fabricate conductive composites. PANi-incorporated conductive materials for in vitro platforms in bone tissue engineering have been reported in several recent studies. Azhar et al. created a chitosan-gelatin (CS-Gel)/nanoHAP(nHAP)-PANi conducting scaffold material by combining the nHA-PANi solution with the CS-gelatin solution and lyophilizing it for better tissue engineering applications [104]. The use of hydrogel/conductive-fiber composites to overcome the inherent constraints of the original hydrogel or fiber scaffold is also a good potential strategy. The natural cellular migration of fibers and the low mechanical characteristics of hydrogels can be improved by coating them with hydrogel matrix. The introduction of a precursor solution containing alginate oxide, hyaluronic acid oxide, gelatin, and graphene into electrospun PCL/PANi fibers has resulted in a hydrogel/fiber composite material with improved elastic modulus, roughness, and electrical conductivity, as well as better adhesion, proliferation, and morphology support for human osteoblasts (Figure 7.5) [105].
Graphene-Based Fibers
Published in Ling Bing Kong, Carbon Nanomaterials Based on Graphene Nanosheets, 2017
Ling Bing Kong, Freddy Boey, Yizhong Huang, Zhichuan Jason Xu, Kun Zhou, Sean Li, Wenxiu Que, Hui Huang, Tianshu Zhang
Figure 5.75 (a) shows schematic illustration of the TGF, which was fabricated by rotating the freshly-spun GO hydrogel fiber along the axis. During the rotating process, the fiber was shortened slightly, while its diameter was decreased correspondingly, due to the elimination of the solvent. The intrinsic structure of the GF was reconstructed during the twisting process. Originally, the GO nanosheets were aligned along the fiber axial direction (Fig. 5.75 (b)), whereas a helical configuration was formed after the twisting process (Fig. 5.75 (c, d)). At the same time, the compact graphene nanosheets on the surface of the TGF were conformed to the rotating direction, as seen in Fig. 5.75 (e). Cross-sectional view indicated that the graphene nanosheets inside the fiber were still densely packed along the axial direction of the fiber, so that the mechanical properties of the TGFs would not be significantly affected by the twisting process. The derived TGFs showed strong mechanical flexibility, while their properties could be adjusted by the varying the inserted twist to a certain degree.
Alginate-based composites for environmental applications: a critical review
Published in Critical Reviews in Environmental Science and Technology, 2019
Bing Wang, Yongshan Wan, Yuling Zheng, Xinqing Lee, Taoze Liu, Zebin Yu, Jun Huang, Yong Sik Ok, Jianjun Chen, Bin Gao
There are a few reports about removal of antibiotics in water using magnetic alginate beads. Kim et al. found that nZVI-immobilized alginate beads removed trichloroethylene (TCE) from aqueous solution by >99.8% (Kim et al.). Konwar et al. prepared magnetic alginate-Fe3O4 hydrogel fibers using a simple laboratory micropipette and found that the magnetic alginate-Fe3O4 hydrogel fibers were effective in adsorption of ciprofloxacin hydrochloride, while the blank alginate hydrogel fiber did not show any significant adsorption. Anion exchange mechanism mainly controlled the adsorption of antibiotic and the formation of hydrogen bonding between the antibiotic and magnetic alginate beads can also result in the increase of adsorption capacity (Konwar, Gogoi, & Chowdhury, 2015). Such magnetic alginate-Fe3O4 hydrogel fibers can serve as a simple and cost-effective probe for adsorption/separation of antibiotics, with additional advantages of being easy to fabricate and having high thermal stability and mechanical strength (Konwar et al., 2015).
Potential of pectin for biomedical applications: a comprehensive review
Published in Journal of Biomaterials Science, Polymer Edition, 2022
Nazlı Seray Bostancı, Senem Büyüksungur, Nesrin Hasirci, Ayşen Tezcaner
Apart from cancer treatments, Ahadi et al. fabricated composites of fibers and hydrogels loaded with an antibiotic, vancomycin, to inhibit bone diseases and to remedy osteomyelitis. The low mechanical strength of pectin hydrogel was solved by interacting with silk fibroin (SF) and electrospun fibers of poly (L-lactide) (PLLA). Sustained release of vancomycin was obtained from the prepared hydrogel/fiber complex matrix [46].
Combining electrospun nanofibers with cell-encapsulating hydrogel fibers for neural tissue engineering
Published in Journal of Biomaterials Science, Polymer Edition, 2018
Ryan J. Miller, Cheook Y. Chan, Arjun Rastogi, Allison M. Grant, Christina M. White, Nicole Bette, Nicholas J. Schaub, Joseph M. Corey
Differences between cell types and chitosan formulations were compared using 2-way ANOVA (α = 0.05) and Tukey’s multiple comparison tests. To make the comparisons fair, pre-encapsulation survival data were omitted from the ANOVA because cells in these groups were never exposed to either polyelectrolyte and therefore to anything in the hydrogel fiber that could decrease their survival.