scholarly journals Binding Analysis of Functionalized Multimode Optical-Fiber Sandwich-like Structure with Organic Polymer and Its Sensing Application for Humidity and Breath Monitoring

Biosensors ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 324
Author(s):  
Daniel Jauregui-Vazquez ◽  
Paulina Lozano-Sotomayor ◽  
Jorge Emmanuel Mejía-Benavides ◽  
Erik Díaz-Cervantes

In recent years, the chemical modification of optical fibers (OFs) has facilitated the manufacture of sensors because OFs can identify several analytes present in aqueous solutions or gas phases. Nevertheless, it is imperative better to understand the chemical interactions in this molecular system to generate low-cost and efficient sensors. This work presents a theoretical and experimental study of organic polymeric functionalized OF structures and proposes a cost-effective alternative to monitor breathing and humidity. The device is based on silicon optical fibers functionalized with (3-Aminopropyl) triethoxysilane (APTES) and alginate. The theoretical analysis is carried out to validate the activation of the silicon dioxide fiber surface; moreover, the APTES–alginate layer is discussed. The computational simulation suggests that water can be absorbed by alginate, specifically by the calcium atom linked to the carboxylic acid group of the alginate. The analysis also demonstrates a higher electrostatic interaction between the water and the OF–APTES–alginate system; this interaction alters the optical fiber activated surface’s refractive index, resulting in transmission power variation. The humidity analysis shows a sensitivity of 3.1288 mV/RH, a time response close to 25 s, and a recovery time around 8 s. These results were achieved in the range of 50 to 95% RH. Moreover, the recovery and response time allow the human breath to be studied. The proposed mechanism or device is competitive with prior works, and the components involved made this sensor a cost-effective alternative for medical applications.

BMC Medicine ◽  
2013 ◽  
Vol 11 (1) ◽  
Author(s):  
Patricia Bruijning-Verhagen ◽  
Marie-Josée J Mangen ◽  
Mariet Felderhof ◽  
Nico G Hartwig ◽  
Marlies van Houten ◽  
...  

Alloy Digest ◽  
2009 ◽  
Vol 58 (11) ◽  

Abstract Ancorsteel 4300 alloy ferrous powder simulates wrought steel compositions and is a cost-effective alternative to alloys requiring secondary processing. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness. It also includes information on heat treating and powder metal forms. Filing Code: SA-611. Producer or source: Hoeganaes Corporation.


HPB ◽  
2020 ◽  
Vol 22 ◽  
pp. S186-S187
Author(s):  
J. Hawksworth ◽  
N.P. Llore ◽  
M.L. Holzner ◽  
P. Radkani ◽  
E. Mesler ◽  
...  

Author(s):  
Venkatesh Piradi ◽  
Feng Yan ◽  
Xunjin Zhu ◽  
Wai-Yeung Raymond Wong

Organic solar cells (OSCs) have been considered as a promising cost-effective alternative to silicon-based solar cell counterparts due to their lightweight, mechanical flexibility, and easy fabrication features. Over the past...


2007 ◽  
Vol 17 (11) ◽  
pp. 1482-1486 ◽  
Author(s):  
Roger Noun ◽  
Eddy Riachi ◽  
Smart Zeidan ◽  
Bassam Abboud ◽  
Viviane Chalhoub ◽  
...  

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