Analysis of Optical Fibers Multilayer-Coated with Segmented Young's Modulus Materials Under Hydrostatic Pressure and Thermal Loading

2006 ◽  
Author(s):  
Golnoush Toutian ◽  
Faramarz Seraji ◽  
M. Fardis ◽  
M. Khanlary
Keyword(s):  
Hydrostatic Pressure ◽  
Young’S Modulus ◽  
Optical Fibers ◽  
Thermal Loading ◽  
Young's Modulus

scholarly journals Integrated dynamic wet spinning of core-sheath hydrogel fibers for optical-to-brain/tissue communications

2020 ◽  
Author(s):  
Guoyin Chen ◽  
Gang Wang ◽  
Xinrong Tan ◽  
Kai Hou ◽  
Qingshuo Meng ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Optical Fibers ◽  
Rational Design ◽  
Large Scale ◽  
Young's Modulus ◽  
Solution Viscosity ◽  
Wet Spinning ◽  
Deep Tissue ◽  
Optogenetic Stimulation ◽  
Tissue Therapy

Abstract Hydrogel optical light-guides have received substantial interest for applications such as deep-tissue biosensors, optogenetic stimulation and photomedicine due to their biocompatibility, (micro)structure control and tissue-like Young's modulus. However, despite recent developments, large-scale fabrication with a continuous synthetic methodology, which could produce core-sheath hydrogel fibers with the desired optical and mechanical properties suitable for deep-tissue applications, has yet to be achieved. In this study, we report a versatile concept of integrated light-triggered dynamic wet spinning capable of continuously producing core-sheath hydrogel optical fibers with tunable fiber diameters, and mechanical and optical propagation properties. Furthermore, this concept also exhibited versatility for various kinds of core-sheath functional fibers. The wet spinning synthetic procedure and fabrication process were optimized with the rational design of the core/sheath material interface compatibility [core = poly(ethylene glycol diacrylate-co-acrylamide); sheath = Ca-alginate], optical transparency, refractive index and spinning solution viscosity. The resulting hydrogel optical fibers exhibited desirable low optical attenuation (0.18 ± 0.01 dB cm−1 with 650 nm laser light), excellent biocompatibility and tissue-like Young's modulus (<2.60 MPa). The optical waveguide hydrogel fibers were successfully employed for deep-tissue cancer therapy and brain optogenetic stimulation, confirming that they could serve as an efficient versatile tool for diverse deep-tissue therapy and brain optogenetic applications.

Mechanical Characterization of PbTe-based Thermoelectric Materials

2007 ◽  
Vol 1044 ◽  
Author(s):  
Fei Ren ◽  
Bradley D Hall ◽  
Jennifer E Ni ◽  
Eldon D Case ◽  
Joe Sootsman ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Thermal Loading ◽  
Powder Processing ◽  
Waste Heat ◽  
Young's Modulus ◽  
Mechanical Vibration ◽  
Testing Temperature ◽  
Type Specimens ◽  
Potential Applications ◽  
Resonant Ultrasound

AbstractPbTe-based thermoelectric (TE) materials exhibit promising thermoelectric properties and have potential applications in waste heat recovery from sources such as truck engines and shipboard engines. TE components designed for these applications will be subject to mechanical/thermal loading and vibration as a result from in-service conditions, including mechanical vibration, mechanical and/or thermal cycling, and thermal shock.In the current study, we present and discuss the mechanical properties of several PbTe-based compositions with different dopants and processing methods, including n-type and p-type specimens fabricated both by casting and by powder processing. Room temperature hardness and Young's modulus are studied by Vickers indentation and nanoindentation while fracture strength is obtained by biaxial flexure testing. Temperature dependent Young's modulus, shear modulus, and Poisson's ratio are studied via resonant ultrasound spectroscopy (RUS).

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