Effects of Gamma Irradiation on the Structure and Mechanical Properties of Wild Silkworms and Bombyx Mori Silk Fibroin Films

2011 ◽  
Vol 197-198 ◽  
pp. 27-31 ◽  
Author(s):  
Si Yong Xiong ◽  
Ya Mei Xu ◽  
Yu Hong Jiao ◽  
Lu Wang ◽  
Ming Zhong Li
Keyword(s):  
Mechanical Properties ◽  
Gamma Irradiation ◽  
Silk Fibroin ◽  
Gamma Ray ◽  
Molecular Conformation ◽  
Covalent Bonds ◽  
Secondary Bonds ◽  
Aggregation Structure ◽  
Bombyx Mori Silk ◽  
Ft Ir

The structure and mechanical properties of A. yamamai, A. perny and B. mori silk fibroin films irradiated by gamma ray with various doses of 0, 25, 50, 100 and 200 kGy, respectively were determined by XRD, FT-IR, DSC and Instron 3365 equipment. Results showed that the aggregation structure and molecular conformation of A. yamamai, A. perny and B. mori silk fibroin films irradiated by gamma ray with those doses mentioned above were not significantly changed. However, with the increase of radiation intensity, the thermal stability of silk fibroin films declined slightly, and the breaking strength and extensibility reduced significantly, due to the breakdown of parts of secondary bonds and covalent bonds. These results suggested that, when these silk fibroin materials were sterilized by gamma irradiation, smaller radiation doses should be used, otherwise irreversible damages on these materials would be caused.

Preparation of Transparent Water-Insoluble Silk Fibroin Films

2011 ◽  
Vol 175-176 ◽  
pp. 79-84
Author(s):  
Min Qing Luo ◽  
Cen Cen Zhang ◽  
Shen Zhou Lu
Keyword(s):  
Mechanical Properties ◽  
Silk Fibroin ◽  
Light Transmittance ◽  
Human Cornea ◽  
X Ray Diffraction ◽  
X Ray ◽  
Blend Films ◽  
Structure Surface ◽  
Ft Ir ◽  
Transparent Water

The transparent water-insoluble silk fibroin(SF) films were casted from the mixture solution of silk fibroin and xylitol/mannitol. The structure, surface morphology, solubility, mechanical properties and light transmittance of the blend films were measured. FT-IR, X-ray diffraction retuslts indicated that the films were mainly composed of Silk I structure. SEM showed the blend films with xylitol were miscible, whereas the blend films with mannitol had phase-separated structure. There were lots of nanopores in the blend films in the wet state. The insoluble SF /xylitol films had excellent mechanical properties while the SF / mannitol films were brittle. The mechanical property of SF/alcohol blend films were consistent with the human cornea in wet state.When the contents of xylitol were 10% and 20%, the blend films had high light transmittance which were similar to human cornea. In summary, the SF /xylitol film containing 10% xylitol provides a great potential to act as repairing materials for cornea.

scholarly journals The effect of gamma ray on the thermo-mechanical property of silk fibroin

2013 ◽  
Vol 17 (5) ◽  
pp. 1521-1522 ◽  
Author(s):  
Huanyu Jin ◽  
Hua Yin ◽  
Yan An
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Silk Fibroin ◽  
Gamma Ray

This paper studies the effect of gamma ray on the thermo-mechanical properties of silk fibroin experimentally. The experiment reveals that the gamma ray can accelerate biodegradation of silk fibroin by decreasing its thermo-mechanical property.

scholarly journals Reversible Mechanical Regulation and Splicing Ability of Alginate-Based Gel Based on Photo-Responsiveness of Molecular-Level Conformation

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2919 ◽  
Author(s):  
Ma ◽  
He ◽  
Wan ◽  
Xiang ◽  
Fan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Conformation ◽  
Molecular Level ◽  
Irradiation Time ◽  
Covalent Bonds ◽  
Cavity Structure ◽  
New Strategy ◽  
Hollow Cavity ◽  
Tunable Mechanical Properties

In this study, benefiting from the sensitive molecular conformation transversion in azobenzene, a new strategy for fabricating alginate gels with the abilities of splicing and photo-responsive mechanical adjustment is reported. Firstly, a 4,4’-azobis(benzoylhydrazide) (Azo-hydrazide) linker was used to crosslink alginate physically via the electrostatic interaction between hydrazide groups and carboxyl groups. It was then shaped and transferred in situ to a chemically crosslinked gel via 450 nm light irradiation. Under the irradiation, the molecular conformation change of azobenzene in the linker was able to form covalent bonds at the crosslinking points of the gels. Furthermore, the reversible conformation transformation of azobenzene was able to induce the increase and decrease of the storage modulus under irradiation with 365 nm light and 450 nm light, respectively, while also providing gel-like mechanical properties, depending upon the irradiation time and given wavelength. Meanwhile, the results also indicated that active groups could contribute to the splicing ability of the gel and construct a hollow cavity structure. It is believed that this work could provide a versatile strategy for preparing photo-responsive gels with reversibly tunable mechanical properties.

Nanomechanical and Microstructural Properties of Bombyx mori Silk Films

2004 ◽  
Vol 841 ◽  
Author(s):  
Donna M. Ebenstein ◽  
Jaehyung Park ◽  
David L. Kaplan ◽  
Kathryn J. Wahl
Keyword(s):  
Mechanical Properties ◽  
Bombyx Mori ◽  
Silk Fibroin ◽  
Microstructural Properties ◽  
Instrumented Indentation ◽  
Micro Raman Spectroscopy ◽  
Mechanical And Structural Properties ◽  
Bombyx Mori Silk ◽  
Silk Films ◽  
Post Deposition

ABSTRACTInstrumented indentation and micro-Raman spectroscopy were used to investigate the mechanical and structural properties of Bombyx mori silk films. Twelve different films were prepared from B. mori silk fibroin protein using a variety of post-deposition processing treatments (e.g. soaking in methanol, soaking in water, stretching, and/or enzymatic etching). The results show that different treatments lead to changes in both the conformation of the silk fibroin protein and the mechanical properties of the films.

Nanomechanical and Microstructural Properties of Bombyx mori Silk Films

2004 ◽  
Vol 844 ◽  
Author(s):  
Donna M. Ebenstein ◽  
Jaehyung Park ◽  
David L. Kaplan ◽  
Kathryn J. Wahl
Keyword(s):  
Mechanical Properties ◽  
Bombyx Mori ◽  
Silk Fibroin ◽  
Microstructural Properties ◽  
Instrumented Indentation ◽  
Micro Raman Spectroscopy ◽  
Mechanical And Structural Properties ◽  
Bombyx Mori Silk ◽  
Silk Films ◽  
Post Deposition

AbstractInstrumented indentation and micro-Raman spectroscopy were used to investigate the mechanical and structural properties of Bombyx mori silk films. Twelve different films were prepared from B. mori silk fibroin protein using a variety of post-deposition processing treatments (e.g. soaking in methanol, soaking in water, stretching, and/or enzymatic etching). The results show that different treatments lead to changes in both the conformation of the silk fibroin protein and the mechanical properties of the films.

Preparation of Silk Fibroin Microspheres

2011 ◽  
Vol 236-238 ◽  
pp. 1902-1905 ◽  
Author(s):  
Lu Wang ◽  
Zhen Ran Xia ◽  
Lin Lin Lv ◽  
Qiang Tang ◽  
Ming Zhong Li
Keyword(s):  
Silk Fibroin ◽  
Flow Rate ◽  
Molecular Conformation ◽  
Solution Concentration ◽  
Random Coil ◽  
Ethanol Treatment ◽  
Drying Method ◽  
Sphere Size ◽  
Ft Ir ◽  
Fibroin Solution

TheBombyx morisilk fibroin microspheres with controllable size were prepared by electrostatic spraying and freeze-drying method. The effects of solution concentration, voltage and flow rate on the sphere size were discussed. The morphology of microspheres was observed by scanning electron microscopy (SEM). The influence of ethanol treatment on the molecular conformation of silk fibroin microspheres was investigated by XRD and FT-IR spectra. The results indicated that the silk fibroin microspheres with diameter in range of 117-363 μm were spherical in shape, and there were plenty of pores both on the surface and in the interior of the microspheres. The sphere size increased with the rising of silk fibroin solution concentration and flow rate, while decreased as the voltage enhanced. The conformation of silk fibroin microspheres changed from random coil to silk II structure after ethanol treatment.

scholarly journals MOLECULAR CONFORMATION OF Bombyx mori SILK FIBROIN

1983 ◽  
Vol 39 (6) ◽  
pp. T265-T268 ◽  
Author(s):  
Masuhiro Tsukada ◽  
Kiyoshi Hirabayashi
Keyword(s):  
Bombyx Mori ◽  
Silk Fibroin ◽  
Molecular Conformation ◽  
Bombyx Mori Silk
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