Mechanical properties of Bombyx mori silkworm silk subjected to microwave radiation

2014 ◽  
Vol 29 (7) ◽  
pp. 833-842 ◽  
Author(s):  
Emily J. Reed ◽  
Christopher Viney
Keyword(s):  
Mechanical Properties ◽  
Bombyx Mori ◽  
Microwave Radiation ◽  
Image Position ◽  
Silkworm Silk

Abstract

The Effect of Microwave Radiation on Tensile Properties of Silkworm (B. mori) Silk

2011 ◽  
Vol 1301 ◽  
Author(s):  
Emily J. Reed ◽  
Christopher Viney
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behavior ◽  
Microwave Radiation ◽  
Power Output ◽  
Microwave Oven ◽  
Test Results ◽  
Sample Storage ◽  
Humid Environment ◽  
Testing Environments ◽  
Silkworm Silk

ABSTRACTWe have developed a reproducible protocol for studying the effect of microwave radiation on the mechanical behavior of Bombyx mori cocoon silk. In the course of this work, we identified multiple improvements that can be made to ASTM F 1317-98, the standard according to which microwave oven power output is calibrated.Exposure to microwaves does not significantly affect mechanical properties of silkworm silk, if samples are kept in a desiccator after degumming (or after degumming and microwaving) and prior to testing in a dry environment. This finding contrasts with previous work in which samples were not kept in a desiccator, and were tested in a relatively humid environment.Because the effect of microwave radiation on the mechanical behavior of silk is sensitive to ambient moisture, meaningful comparison or pooling of test results acquired in different laboratories is contingent on standardization of both the sample storage environment and the environment in which samples are tested. Interpretation of the extensive existing literature on silk mechanical properties must take account of the reality that the sample storage and testing environments are not standardized and are usually not reported.

Does Thermal Annealing Affect the Mechanical Properties of Silkworm (Bombyx mori) Cocoon Silk?

2012 ◽  
Vol 1465 ◽  
Author(s):  
Emily J. Reed ◽  
Christopher Viney
Keyword(s):  
Mechanical Properties ◽  
Bombyx Mori ◽  
Microwave Radiation ◽  
Constant Strain Rate ◽  
Annealing Treatment ◽  
Tensile Tests ◽  
Conventional Heating ◽  
Heating Rates ◽  
Microwave Exposure ◽  
Property Changes

ABSTRACTIt has been reported [1] that microwave radiation can enhance many of the mechanical properties of Bombyx mori silkworm cocoon silk, as measured in constant strain rate tensile tests to failure and in stress relaxation tests. The consequences of microwave radiation will affect decisions about the use of silk in settings subjected to significant microwave exposure – for example, as a reinforcing fiber in an epoxy matrix composite that may be microwave cured, or as a component in aircraft radomes.There are two possible mechanisms by which microwave radiation may affect a material [2]: (i) the radiation may enable chemical and/or microstructural changes – and therefore property changes – in the same way that conventional heating would, or (ii) the high heating rates that are achievable by microwaving may selectively favor changes that would be masked under conventional conditions, where heating rates are low enough to give preference to changes that have a lower activation energy. Here we explore the former possibility for silk.We characterized several mechanical properties of degummed and subsequently annealed B. mori silk, and compared them to the corresponding properties of degummed B. mori silk that was not annealed. The annealing treatment was carried out at 140 °C for 7 hours (conditions that optimally increased crystal size in an unrelated study of B. mori silk [3]), and then the fibers were allowed to cool gradually to room temperature over the course of an hour. Comparison of mechanical properties revealed no differences between the materials that we tested. Thus, for annealed silk, we do not observe the enhancements that can be achieved by microwaving. We conclude that in cases where microwaving affects the properties of silk, those changes are not a simple consequence of annealing by the microwaves.

scholarly journals Mechanical properties of Bombyx mori silkworm silk fibre and its corresponding silk fibroin filament: A comparative study

2019 ◽  
Vol 181 ◽  
pp. 108077 ◽  
Author(s):  
Shaoyong Chen ◽  
Mingyue Liu ◽  
Huiming Huang ◽  
Lan Cheng ◽  
Hong-Ping Zhao
Keyword(s):  
Mechanical Properties ◽  
Comparative Study ◽  
Bombyx Mori ◽  
Silk Fibroin ◽  
Silk Fibre ◽  
Silkworm Silk

scholarly journals Super-strong and Intrinsically Fluorescent Silkworm Silk from Carbon Nanodots Feeding

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Suna Fan ◽  
Xiaoting Zheng ◽  
Qi Zhan ◽  
Huihui Zhang ◽  
Huili Shao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tissue Engineering ◽  
Bombyx Mori ◽  
Cytotoxic Effect ◽  
Breaking Strength ◽  
Carbon Nanodots ◽  
Blue Fluorescence ◽  
Tissue Engineering Scaffolds ◽  
Great Progress ◽  
Silkworm Silk

Abstract Fluorescent silk is fundamentally important for the development of future tissue engineering scaffolds. Despite great progress in the preparation of a variety of colored silks, fluorescent silk with enhanced mechanical properties has yet to be explored. In this study, we report on the fabrication of intrinsically super-strong fluorescent silk by feeding Bombyx mori silkworm carbon nanodots (CNDs). The CNDs were incorporated into silk fibroin, hindering the conformation transformation, confining crystallization, and inducing orientation of mesophase. The resultant silk exhibited super-strong mechanical properties with breaking strength of 521.9 ± 82.7 MPa and breaking elongation of 19.2 ± 4.3%, improvements of 55.1% and 53.6%, respectively, in comparison with regular silk. The CNDs-reinforced silk displayed intrinsic blue fluorescence when exposed to 405 nm laser and exhibited no cytotoxic effect on cells, suggesting that multi-functional silks would be potentially useful in bioimaging and other applications.

Effects of alumina (Al2O3) addition on the cell structure and mechanical properties of 6061 foams

2013 ◽  
Vol 28 (17) ◽  
pp. 2509-2519 ◽  
Author(s):  
Nazim Mahmutyazicioglu ◽  
Onder Albayrak ◽  
Mehmet Ipekoglu ◽  
Sabri Altintas
Keyword(s):  
Mechanical Properties ◽  
Cell Structure ◽  
Al2o3 Addition ◽  
Image Position

Abstract

scholarly journals Self-ion irradiation effects on mechanical properties of nanocrystalline zirconium films

2017 ◽  
Vol 7 (3) ◽  
pp. 595-600 ◽  
Author(s):  
Baoming Wang ◽  
M. A. Haque ◽  
Vikas Tomar ◽  
Khalid Hattar
Keyword(s):  
Mechanical Properties ◽  
Ion Irradiation ◽  
Irradiation Effects ◽  
Image Position

Abstract

scholarly journals Determination of mechanical properties by nanoindentation independently of indentation depth measurement

2012 ◽  
Vol 27 (19) ◽  
pp. 2551-2560 ◽  
Author(s):  
Gaylord Guillonneau ◽  
Guillaume Kermouche ◽  
Sandrine Bec ◽  
Jean-Luc Loubet
Keyword(s):  
Mechanical Properties ◽  
Indentation Depth ◽  
Depth Measurement ◽  
Image Position

Abstract

Effects of minor Y addition on microstructure and mechanical properties of Mg–Nd–Zn–Zr alloy

2017 ◽  
Vol 32 (19) ◽  
pp. 3712-3722 ◽  
Author(s):  
Yushi Chen ◽  
Guohua Wu ◽  
Wencai Liu ◽  
Liang Zhang ◽  
Haohao Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Microstructure And Mechanical Properties ◽  
Image Position ◽  
Zr Alloy

Abstract

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