Conductive regenerated silk fibroin composite fiber containing MWNTs

e-Polymers ◽  
2013 ◽  
Vol 13 (1) ◽  
Author(s):  
Negin Piri ◽  
Vahid Mottaghitalab ◽  
Shahram Arbab
Keyword(s):  
Silk Fibroin ◽  
General Scheme ◽  
Conductive Filler ◽  
Composite Fiber ◽  
Multiwalled Carbon ◽  
Sem Images ◽  
Chain Entanglement ◽  
Regenerated Silk Fibroin ◽  
Maximum Conductivity ◽  
Spinning Process

Abstract The electrically conductive regenerated silk fibroin (RSF) fiber containing multiwalled carbon nanotubes (MWNTs) was developed through wet spinning process. A general scheme used for extraction of RSF powder as biopolymer matrix for MWNTs conductive filler. The MWNTs inclusion demands for a sophisticated approach to prepare stable, exfoliated and well distributed filler in matrix solution. Dynamic Light Scattering (DLS) was utilized to show the ability of RSF in stabilizing of MWNTs throughout spinning solution. A non-Newtonian shear thinning behavior observed for RSF/MWNTs according to strong chain entanglement, whereas, the neat RSF solution shows a lower dependence on the shear rate. The scanning electron microscopy (SEM) images also confirmed the proper distribution of MWNTs as a continuous fibril media in the RSF matrix. The Fourier transform infrared spectroscopy (FTIR) demonstrated the role of MWNTs inclusion for increasing of the crystalinity compared to bare RSF fiber. The Raman spectra also confirmed the domination of RSF signatures by strong Raman bands of MWNTs most specifically in RBM region regarding to superior nanotube exfoliation. Moreover, the measurement of four-point probe electrical conductivity for different MWNTs content shows a maximum conductivity of 0.12 S/cm at percolation threshold. The higher thermal stability and greater crystalinity were also evidenced by DSC thermal analysis.

SILK FIBROIN FILMS CRYSTALLIZED BY MULTIWALLED CARBON NANOTUBES

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1807-1812 ◽  
Author(s):  
H.-S. KIM ◽  
W.-I. PARK ◽  
Y. KIM ◽  
H.-J. JIN
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Silk Fibroin ◽  
Composite Films ◽  
Tensile Modulus ◽  
Multiwalled Carbon ◽  
Regenerated Silk Fibroin ◽  
Silk Films ◽  
Β Sheet

Silk films prepared from regenerated silk fibroin are normally stabilized by β-sheet formation through the use of solvents (methanol, water etc.). Herein, we report a new method of preparing water-stable films without a β-sheet conformation from regenerated silk fibroin solutions by incorporating a small amount (0.2 wt%) of multiwalled carbon nanotubes (MWCNTs). To extend the biomaterial utility of silk proteins, forming water-stable silk-based materials with enhanced mechanical properties is essential. Scanning electron microscopy and transmission electron microscopy were used to observe the morphology of the MWCNT-incorporated silk films. The wide-angle X-ray diffraction provided clear evidence of the crystallization of the silk fibroin induced by MWCNT in the composite films without any additional annealing processing. The tensile modulus and strength of the composite films were improved by 108% and 51%, respectively, by the incorporation of 0.2 wt% of MWCNTs, as compared with those of the pure silk films. The method described in this study will provide an alternative means of crystallizing silk fibroin films without using an organic solvent or blending with any other polymers, which may be important in biomedical applications.

Study on the Mechanical Property of CNTs/Silk Fibroin Composite Fiber

2014 ◽  
Vol 1004-1005 ◽  
pp. 577-580
Author(s):  
Yu Chun Jiang ◽  
Yong Xiang Huang ◽  
Yuan Song Zhang
Keyword(s):  
Mechanical Property ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Silk Fibroin ◽  
Composite Fiber ◽  
Preparation Conditions ◽  
Regenerated Silk Fibroin ◽  
Excellent Mechanical Property ◽  
New Type ◽  
Fibroin Solution

Carbon nanotube (CNT) is a new type of nanoscale materials, which has excellent adsorption and mechanical properties. In this paper, carbon nanotubes were added in the regenerated silk fibroin solution to get CNTs/silk fibroin composite fiber, which had more excellent mechanical property than the regenerated fibroin fiber. The results indicate that the optimum preparation conditions are summed up as follows: silk fibroin concentration 35%, spinning temperature 40oC, carbon nanotube mass fraction 1.0% and the longest storage time less than 7 days. The mechanical property of regenerated fibroin fiber which added with carbon nanotubes is obviously improved.

scholarly journals Microstructure Transitions and Dry-Wet Spinnability of Silk Fibroin Protein from Waste Silk Quilt

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1622 ◽  
Author(s):  
Xin Zhang ◽  
Zhijuan Pan
Keyword(s):  
Silk Fibroin ◽  
Coagulation Bath ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Leading Role ◽  
Regenerated Silk Fibroin ◽  
Spinning Process ◽  
Silk Fabrics ◽  
The Many ◽  
Conformation Transitions

With excellent biocompatibility and biodegradability, silk fibroin has been developed into many protein materials. For producing regenerated silk fibroin (RSF) fibers, the conformation transition of silk fibroin needs to be thoroughly studied during the spinning process. Since the many silk fabrics that are discarded comprise an increasing waste of resources and increase the pressure on the environment, in this paper, waste silk fiber was recycled in an attempt to prepare regenerated fibroin fiber by dry-wet spinning. Ethanol was the coagulation bath. The rheological properties of all the RSF solutions were investigated to acquire rheology curves and non-Newtonian indexes for spinnability analysis. Four stages of the spinning process were carried out to obtain RSF samples and study their conformation transitions, crystallization, and thermal properties by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction, and differential scanning calorimetry. Quantitative analysis of the FTIR results was performed to obtain specific data regarding the contents of the secondary structures. The results showed that higher concentration spinning solutions had better spinnability. As the spinning process progressed, random coils were gradually converted into β-sheets and crystallization increased. Among the different influencing factors, the ethanol coagulation bath played a leading role in the conformation transitions of silk fibroin.

scholarly journals Efficient Removal of Cationic and Anionic Dyes from Aqueous Solutions using Regenerated Silk Fibroin Beads

2020 ◽  
Vol 32 (7) ◽  
pp. 1623-1629
Author(s):  
Walaikorn Nitayaphat ◽  
Thanut Jintakosol
Keyword(s):  
Methylene Blue ◽  
Silk Fibroin ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Anionic Dyes ◽  
Sem Images ◽  
Regenerated Silk Fibroin ◽  
Initial Ph

Regenerated silk fibroin beads (rSFB) were successfully prepared and applied to adsorbing methylene blue and Lanasyn Navy M-DNL. The effects of contact time, initial pH and initial concentration of dyes were analyzed. The experimental results showed that, the adsorption was pH dependent with a high removal efficiency of methylene blue in basic range and high removal of Lanasyn Navy M-DNL in acidic range. The adsorption process was analyzed by using Langmuir and Freundlich isotherm models and the Langmuir isotherm model showed the best fitting to the isotherm data. The maximum adsorption capacities for methylene blue and Lanasyn Navy M-DNL were 47.55 and 78.74 μmg/g, respectively. The kinetics study showed that the adsorption process followed the second order kinetic model. The SEM images demonstrated that after adsorption the dye was adsorbed onto the regenerated silk fibroin beads surface. The adsorbent was stable and active for up to five successive cycles. Regenerated silk fibroin beads showed to be an advantageous adsorbents in terms of availability, which is beneficial for the wastewater treatment.

Fabrication of Organic Silk Fibroin/Multiwalled Carbon Nanotube Composite Cryogels by Freeze-Drying Method

2008 ◽  
Vol 47-50 ◽  
pp. 1105-1108 ◽  
Author(s):  
Soon Min Kwon ◽  
Hun Sik Kim ◽  
Hyoung Joon Jin
Keyword(s):  
Electron Microscopy ◽  
Silk Fibroin ◽  
Freeze Drying ◽  
Sol Gel ◽  
Three Dimensional ◽  
Nitrogen Adsorption ◽  
Network Structures ◽  
Multiwalled Carbon ◽  
Regenerated Silk Fibroin ◽  
Fibroin Solution

The multiwalled carbon nanotubes (MWCNTs) incorporated organic silk fibroin cryogels were fabricated through sol-gel process of aqueous silk fibroin solution, followed by freeze-drying. The MWCNT incorporated silk fibroin hydrogel was prepared by the regeneration of silk fibroin using an aqueous silk fibroin solution in which MWCNTs were dispersed by in-situ methods. The morphology and microstructure of the silk fibroin network structure were characterized using field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The FESEM and TEM images show that the cryogels had three-dimensional network structures and the MWCNTs were well embedded in the network structures of regenerated silk fibroin. The porous properties of the MWCNT incorporated silk fibroin cryogels were investigated by nitrogen adsorption-desorption technique. The MWCNTs increased the proportions of micropores and mesopores in the silk fibroin cryogels when they were introduced in the appropriate amounts.

A Novel Facile and Green Synthesis Protocol to Prepare High Strength Regenerated Silk Fibroin/SiO2 Composite Fiber

2019 ◽  
Vol 20 (10) ◽  
pp. 2222-2226 ◽  
Author(s):  
Qiang Liu ◽  
Zhaohui Meng ◽  
Ronghui Wu ◽  
Liyun Ma ◽  
Wu Qiu ◽  
...  
Keyword(s):  
Green Synthesis ◽  
Silk Fibroin ◽  
High Strength ◽  
Composite Fiber ◽  
Regenerated Silk Fibroin ◽  
Synthesis Protocol

Stem Cell Response to Multiwalled Carbon Nanotube-Incorporated Regenerated Silk Fibroin Films

2011 ◽  
Vol 11 (1) ◽  
pp. 801-805 ◽  
Author(s):  
Se Youn Cho ◽  
Young Soo Yun ◽  
E Sle Kim ◽  
Moon Suk Kim ◽  
Hyoung-Joon Jin
Keyword(s):  
Stem Cell ◽  
Carbon Nanotube ◽  
Silk Fibroin ◽  
Cell Response ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Regenerated Silk Fibroin

Silk-based hybrid microfibrous mats as guided bone regeneration membranes

2021 ◽  
Author(s):  
Mi Wu ◽  
Zhengyi Han ◽  
Wen Liu ◽  
Jinrong Yao ◽  
Bingjiao Zhao ◽  
...  
Keyword(s):  
Stem Cells ◽  
Bone Marrow ◽  
Mesenchymal Stem Cells ◽  
Cell Adhesion ◽  
Bone Regeneration ◽  
Silk Fibroin ◽  
Guided Bone Regeneration ◽  
Regenerated Silk Fibroin ◽  
Marrow Mesenchymal Stem Cells ◽  
Cell Adhesion And Proliferation

LAPONITE® (LAP) nanoplatelets were incorporated within a regenerated silk fibroin (RSF) microfibrous mat via electrospinning, which exhibited better cell adhesion and proliferation of bone marrow mesenchymal stem cells (BMSCs) than the pristine RSF ones.

Some comments on the penetration of water vapor into regenerated silk fibroin

Polymer ◽  
2001 ◽  
Vol 42 (12) ◽  
pp. 5495-5499 ◽  
Author(s):  
Y. Hirai ◽  
J. Ishikuro ◽  
T. Nakajima
Keyword(s):  
Water Vapor ◽  
Silk Fibroin ◽  
Regenerated Silk Fibroin
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