scholarly journals Fabrication of Silk Fibroin/Graphene Film with High Electrical Conductivity and Humidity Sensitivity

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1774 ◽  
Author(s):  
Haoran Zhang ◽  
Juntao Zhao ◽  
Tieling Xing ◽  
Shenzhou Lu ◽  
Guoqiang Chen
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Silk Fibroin ◽  
Biomedical Applications ◽  
Wearable Sensors ◽  
Graphene Film ◽  
Natural Material ◽  
Casting Method ◽  
Good Biocompatibility ◽  
Minimum Resistance

Silk fibroin (SF) is a natural material with good biocompatibility and excellent mechanical properties, which are complementary to graphene with ultrahigh electrical conductivity. In this study, to maximally combine graphene and silk fibroin, a well-dispersed silk fibroin/graphene suspension was successfully prepared in a simple and effective way. Then we prepared a flexible conductive SF/graphene film with a minimum resistance of 72.1 ± 4.7 Ω/sq by the casting method. It was found that the electrical conductivity of the SF/graphene film was related to the water content of the film, and the variation was more than 200 times. Therefore, it will play an important role in the field of humidity sensors. It also has excellent mechanical properties in both wet and dry states. These unique features make this material a promising future in the fields of biomedical applications, wearable sensors, and implantable internal sensors.

Silk Fibroin/Hyaluronic Acid Blend Film with Good Water Stability and Cytocompatibility

2013 ◽  
Vol 377 ◽  
pp. 209-214
Author(s):  
Ling Shuang Wang ◽  
Shu Qin Yan ◽  
Ming Zhong Li
Keyword(s):  
Cell Proliferation ◽  
Hyaluronic Acid ◽  
Silk Fibroin ◽  
Biomedical Applications ◽  
Water Resistance ◽  
High Water ◽  
Casting Method ◽  
Blend Ratio ◽  
Blend Films

Stimulating cell proliferation is a challenge in the field of silk fibroin-based biomaterials. In this study, silk fibroin/hyaluronic acid blend films were prepared by a casting method using carbodiimide as a cross-linking agent. Carbodiimide induced silk fibroin to form Silk I crystal structure which was not affected by the presence of hyaluronic acid. The films showed high water resistance. In vitro, the performance of these films was assessed by seeding L929 cells. The results indicated that the silk fibroin/hyaluronic acid blend films with the blend ratio of 80/20 and 60/40 promoted cell proliferation compared with the pure silk fibroin or hyaluronic acid film. These results suggest that silk fibroin/hyaluronic acid blend films are water stable and cytocompatible materials which are expected to be useful in biomedical applications.

Ti-Mo Alloys Used in Medical Applications

2015 ◽  
Vol 1128 ◽  
pp. 105-111 ◽  
Author(s):  
Mădălina Simona Bălţatu ◽  
Petrică Vizureanu ◽  
Mircea Horia Tierean ◽  
Mirabela Georgiana Minciună ◽  
Dragoş Cristian Achiţei
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloys ◽  
Biomedical Applications ◽  
Medical Field ◽  
Steel Alloys ◽  
Good Corrosion Resistance ◽  
Metallic Biomaterials ◽  
Good Biocompatibility ◽  
Implant Alloys ◽  
General Aspects

Metallic biomaterials are used in various applications of the most important medical fields (orthopedic, dental and cardiovascular). The main metallic biomaterials are stainless steels, Co-based alloys and Ti-based alloys. Recently, titanium alloys are getting much attention for biomaterials because these types of materials have very good mechanical properties, good corrosion resistance and an excellent biocompatibility. The paper contains important information about titanium alloys used for biomedical applications, which are considered the most widely. It is very important to understand the microstructural evolution and property-microstructure relationship in implant alloys. In the present paper, authors present a short literature review on general aspects of promising biocompatible binary Ti-Mo alloys compared with CoCr and stainless steel alloys, as an alternative of the known metallic biomaterials. This alloys show superior mechanical compatibility and very good biocompatibility. The aim of this review is to highlight the mechanical properties for several types of biomaterials, their application in medical field, especially the Ti-Mo group.

scholarly journals The electrical and mechanical properties of Cadmium chloride reinforced PVA:PVP blend films

2020 ◽  
Vol 12 ◽  
pp. 120006
Author(s):  
Rana S. Mahmood ◽  
Sabah A. Salman ◽  
Nabeel Ali Bakr
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Polymer Blend ◽  
Weight Ratio ◽  
Experimental Results ◽  
Casting Method ◽  
Ac Electrical Conductivity ◽  
Elongation At Break ◽  
Blend Films ◽  
Reinforced Polymer

In this study, pure polymer blend (PVA:PVP) film and salt (CdCl2·H2O) reinforced polymer blend films were prepared at different weight ratios (10 wt%, 20 wt%, 40 wt%) using the casting method. The effect of the salt weight ratio on the dielectric properties of the polymer blend films reinforced by CdCl2·H2O salt were investigated, and the experimental results showed that the dielectric constant and the dielectric loss factor decreased as the frequency increased for all polymer blend films. Moreover, the above-mentioned properties increased with increasing salt weight ratios at the same frequency. The experimental results also showed an increase in AC electrical conductivity with increasing frequency, for all polymer blend films, and the AC electrical conductivity also increased with an increase in the weight ratio of the salt at the same frequency. The effect of the salt weight ratio on the mechanical properties of the salt-reinforced PVA:PVP polymer blend films was also studied. The experimental results obtained from the tensile test of the salt-reinforced polymer blend films show significant change in the values of tensile strength, elongation at break, and Young’s modulus with increasing salt weight ratios; the hardness value first increases then decreases with increasing salt weight ratios, and the fracture energy value increases with increasing salt weight ratios, thus they could be good candidates for hard adhesives with low flexibility.

scholarly journals Electrospun Hydrophobic Polyaniline/Silk Fibroin Electrochromic Nanofibers with Low Electrical Resistance

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2102 ◽  
Author(s):  
Chun-Yu Chen ◽  
Szu Ying Huang ◽  
Hung-Yu Wan ◽  
Yi-Ting Chen ◽  
Sheng-Ka Yu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Silk Fibroin ◽  
Electrical Resistance ◽  
Composite Nanofibers ◽  
Academic Research ◽  
Electronic Textiles ◽  
Electrospinning Technique ◽  
Conductive Polyaniline ◽  
Advanced Applications

Electronic textiles (E-textiles) have been an area of intense industrial and academic research for years due to their advanced applications. Thus, the goal of this study was to develop highly conductive silk fibroin electrochromic nanofibers for use in E-textiles. The silk nanofibers were prepared by an electrospinning technique, and the conductive polyaniline (PANI) was added to impart the electrical conductivity and electroactive property to the resultant electrospun silk composite nanofibers. The experimental results showed that tuning the electrospinning procedure could control the morphology of the composite nanofibers, thus altering their mechanical properties and surface wettability. Furthermore, the developed PANI/silk composite fibers possess electroactive and electrochromic properties, such as adjusting the applied voltage. The developed strategy demonstrated the feasibility of incorporating not only electrical functionality but also electroactivity into sustainable silk nanofibers using electrospinning technique.

Progress in Preparation of Silk Fibroin Microspheres for Biomedical Applications

2020 ◽  
Vol 8 (5) ◽  
pp. 358-371
Author(s):  
Shihe Long ◽  
Yun Xiao ◽  
Xingdong Zhang
Keyword(s):  
Cell Culture ◽  
Silk Fibroin ◽  
Biomedical Applications ◽  
Major Protein ◽  
High Mechanical Strength ◽  
Precise Control ◽  
Challenges And Opportunities ◽  
Natural Biomaterial ◽  
Good Biocompatibility ◽  
Near Future

: As a natural biomaterial, silk fibroin (SF) holds great potential in biomedical applications with its broad availability, good biocompatibility, high mechanical strength, ease of fabrication, and controlled degradation. With emerging fabrication methods, nanoand microspheres made from SF have brought about unique opportunities in drug delivery, cell culture, and tissue engineering. For these applications, the size and distribution of silk fibroin particles (SFPs) are critical and require precise control during fabrication. Herein, we review common and emerging SFPs fabrication methods and their biomedical applications, and also the challenges and opportunities for SFPs in the near future. : Lay Summary: The application of silk in textile has an extraordinarily long history and new biomedical applications emerged owing to the good biocompatibility and versatile fabrication options of its major protein component, silk fibroin. With the development of nanotechnology and microfabrication, silk fibroin has been fabricated into nano- or microspheres with precisely controlled shape and distribution. In this review, we summarize common and emerging silk fibroin particle fabrication methods and their biomedical applications, and also discuss their challenges and opportunities in the nearest future.

Graphene/polyurethane composites: fabrication and evaluation of electrical conductivity, mechanical properties and cell viability

RSC Advances ◽  
2015 ◽  
Vol 5 (120) ◽  
pp. 98762-98772 ◽  
Author(s):  
Gagan Kaur ◽  
Raju Adhikari ◽  
Peter Cass ◽  
Mark Bown ◽  
Margaret D. M. Evans ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Cell Viability ◽  
Biomedical Applications ◽  
Conductive Composites ◽  
Polyurethane Composites

Conductive composites of graphene and a siloxane polyurethane (Elast-Eon™) were prepared to explore their potential for use in biomedical applications.

scholarly journals Developing a Silk Fibroin Composite Film to Scavenge and Probe H2O2 Associated with UV-Excitable Blue Fluorescence

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 366
Author(s):  
Tze-Wen Chung ◽  
Chun-Yi Chang ◽  
Chun-Ning Chang ◽  
Chiu-Hsun Liao ◽  
Yun-Jen Jan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Horseradish Peroxidase ◽  
Composite Film ◽  
Silk Fibroin ◽  
Biomedical Applications ◽  
Blue Fluorescence ◽  
Near Ir ◽  
Good Biocompatibility ◽  
Responsive Element

A silk fibroin composite film that can simultaneously scavenge and probe H2O2 in situ was developed for possibly examining local concentrations of H2O2 for biomedical applications. A multi-functional composite film (GDES) that consists of graphene oxide (G), a photothermally responsive element that was blended with polydopamine (PDA, D)/horseradish peroxidase (HRP, E) (or DE complex), and then GDE microaggregates were coated with silk fibroin (SF, S), a tyrosine-containing protein. At 37 °C, the H2O2-scavenging ability of a GDES film in solution at approximately 7.5 × 10−3 μmol H2O2/mg film was the highest compared with those of S and GS films. The intensities of UV-excitable blue fluorescence of a GDES film linearly increased with increasing H2O2 concentrations from 4.0 μM to 80 μM at 37 °C. Interestingly, after a GDES film scavenged H2O2, the UV-excitable blue fluorescent film could be qualitatively monitored by eye, making the film an eye-probe H2O2 sensor. A GDES film enabled to heat H2O2-containing samples to 37 °C or higher by the absorption of near-IR irradiation at 808 nm. The good biocompatibility of a GDES film was examined according to the requirements of ISO-10993-5. Accordingly, a GDES film was developed herein to scavenge and eye-probe H2O2 in situ and so it has potential for biomedical applications.

scholarly journals Gelatin/Polycaprolactone Electrospun Nanofibrous Membranes: The Effect of Composition and Physicochemical Properties on Postoperative Cardiac Adhesion

2021 ◽  
Vol 9 ◽  
Author(s):  
Xingang Wang ◽  
Li Xiang ◽  
Yongxuan Peng ◽  
Zihao Dai ◽  
Yuqing Hu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Biomedical Applications ◽  
Structural Integrity ◽  
Adhesion Formation ◽  
Inflammatory Cells ◽  
Mass Ratio ◽  
Cell Penetration ◽  
Penetration Ability ◽  
Good Biocompatibility ◽  
Nanofibrous Membranes

Cardiovascular diseases have become a major threat to human health. The adhesion formation is an inevitable pathophysiological event after cardiac surgery. We have previously shown that gelatin/polycaprolactone (GT/PCL, mass ratio 50:50) electrospun nanofibrous membranes have high potential in preventing postoperative cardiac adhesion, but the effect of GT:PCL composition on anti-adhesion efficacy was not investigated. Herein, nanofibrous membranes with different GT:PCL mass ratios of 0:100, 30:70, 50:50, and 70:30 were prepared via electrospinning. The 70:30 membrane failed to prevent postoperative cardiac adhesion, overly high GT contents significantly deteriorated the mechanical properties, which complicated the suturing during surgery and hardly maintained the structural integrity after implantation. Unexpectedly, the 0:100 membrane (no gelatin contained) could not effectively prevent either, since its large pore size allowed the penetration of numerous inflammatory cells to elicit a severe inflammatory response. Only the GT:PCL 50:50 membrane exhibited excellent mechanical properties, good biocompatibility and effective anti-cell penetration ability, which could serve as a physical barrier to prevent postoperative cardiac adhesion and might be suitable for other biomedical applications such as wound healing, guided tissue or bone regeneration.

scholarly journals A Study To Evaluate The Bioactivity Behavior And Electrical Properties of Hydroxyapatite/Ag2O-Borosilicate Glass Nanocomposites For Biomedical Applications

2021 ◽  
Author(s):  
Asma M. Alturki ◽  
Dalia E. Abulyazied ◽  
Mohammed Taha ◽  
H. M. Abomostafa ◽  
Rasha A. Youness
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Borosilicate Glass ◽  
Biomedical Applications ◽  
Physical And Mechanical Properties ◽  
High Energy ◽  
X Ray Diffraction ◽  
High Energy Ball Mill ◽  
Energy Ball

Abstract The aim of this work is to prepare nanocomposites with excellent bioactivity and appropriate mechanical properties. In this regard, the nanocomposites, with different contents of borosilicate glass (BG) and carbonated hydroxyapatite (CHA), were mixed and milled using a high-energy ball mill. Then, these milled powders were subjected to sintering at 750 ºC. In order to examine their phase composition, molecular structure and microstructure, X-ray diffraction (XRD) technique, Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM), respectively were used. Moreover, the DC electrical conductivity, and physical and mechanical properties of the prepared nanocomposites were also measured. In addition, the in vitro bioactivity of the sintered samples was evaluated using XRD and SEM. Unexpectedly; the results indicated that the successive increase in BG contents promoted the partial decomposition of CHA molecules at this lower sintering temperature. Also, it was responsible for the enhanced bioactivity behavior along with giving CHA better mechanical properties. However, the electrical conductivity of the examined samples exhibited an opposite trend where it decreased significantly with increasing BG content. According to the results obtained, the prepared samples are suitable for use in various biomedical applications.

scholarly journals Synthesis of Nano Conducting Polymer Based Polyaniline and it's Composite: Mechanical Properties, Conductivity and Thermal Studies

2010 ◽  
Vol 7 (1) ◽  
pp. 105-110 ◽  
Author(s):  
M. Banimahd Keivani ◽  
K. Zare ◽  
M. Aghaie ◽  
H. Aghaie ◽  
M. Monajjemi
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Thermal Treatment ◽  
Polymer Composite ◽  
Thermal Studies ◽  
Spectrophotometric Analysis ◽  
Molar Ratio ◽  
Solvent Casting ◽  
Casting Method ◽  
Preparation Conditions

Polyaniline (PAn) was prepared chemically in the presence of bronsted acid from aqueous solutions. Polyaniline- nylon 6 composite (termed as PAn/Ny6) prepared via solvent casting method. The preparation conditions were optimized with regard to the mechanical properties of the polymer composite. It was found that the molar ratio of PAn to nylon have the greatest effect in determining the mechanical properties of polymer composite. Electrical conductivity was measured using standard method of four point probe. Spectrophotometric analysis (UV-Vis) was used for investigation of the effect of thermal treatment on polyaniline and it’s composite.

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