gamma ray irradiation
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Author(s):  
Mohd Gulfishan ◽  
Rayees Afzal Mir ◽  
Syed Aasif Hussain ◽  
Sajjad Khan ◽  
Fatima Shabir ◽  
...  

Author(s):  
Siyu Wang ◽  
Peng Li ◽  
Lei Sheng ◽  
Lizhu Song ◽  
Rui Zang ◽  
...  

Surface vacancy has been demonstrated to be an active site in photocatalytic hydrogen evolution reaction (HER) over sulfide and oxide. In this work, surface S vacancy was regulated by high-energy...


Author(s):  
Huifen Wei ◽  
Wenping Geng ◽  
Kaixi Bi ◽  
Tao Li ◽  
Xiangmeng Li ◽  
...  

Abstract LiNbO3 (LN)-based micro-electro-mechanical systems (MEMS) vibration sensors exhibit giant prospection in extreme environments, where exist a great amount of irradiation. However, to the best of our knowledge, it is still unknown whether the irradiation affects the performance of LN-based piezoelectric MEMS sensors. Based on this consideration, it is necessary to model the irradiation environment to investigate the effect of high dosage irradiation on LN-based vibration sensors. Firstly, the theoretical work is done to study the Compton Effect on the Gamma-ray irradiation with Co-60 source. After irradiation, X-ray diffraction (XRD) characterization was performed to verify the effect of irradiation on the crystalline of LN thin film. Meanwhile, the performances of output voltages on the five MEMS devices under various dosage of irradiation are compared. As a result, a neglected shift of 0.02 degrees was observed from the XRD image only under maximum irradiation dosage of 100 Mrad(Si). Moreover, the output voltages of cantilever-beam vibration sensors decrease by 3.1%. Therefore, it is verified that the γ-ray irradiation has very little influence on the LN-based MEMS vibration sensors, which have great attraction on the materials and sensors under high-dose irradiation.


2021 ◽  
Vol 70 (11) ◽  
pp. 358-364
Author(s):  
Atsushi Omori ◽  
Saya Ajito ◽  
Hiroshi Abe ◽  
Kuniki Hata ◽  
Tomonori Sato ◽  
...  

2021 ◽  
Vol 8 ◽  
Author(s):  
Muhammad Asim Raza ◽  
Jin-Oh Jeong ◽  
Sang Hyun Park

Chronic and debilitating diseases can be marginally cured by anti-inflammatory, antiseptic, and antibiotic drugs, there is still need for more efficacious delivery approaches. Biodegradable and biocompatible polymeric hydrogels are essential requirements for drug release systems due to sustained or targeted drug delivery. Irradiation crosslinking of polymers is considered a safe route for the fabrication of hydrogels because crosslinking takes place without addition of unnecessary toxic reagents such as initiators or crosslinkers. This technology is a useful way to induce sterilization and crosslinking in a single step. Several natural and synthetic polymers in different combinations are crosslinked through high energy ionizing radiation such as electron beam and gamma ray irradiation. Polymeric hydrogels prepared using these techniques exhibit good gel fraction, swelling ratio, and mechanical properties. In addition, hydrogels possess drug loading and release characteristics, antimicrobial characteristics, and in-vivo/in-vitro cytocompatibility. The advantage of biodegradable and biocompatible drug release systems is the controlled release of drugs without deleterious effects on targeted sites. This mini review about irradiation crosslinked hydrogels will provide sufficient guidelines for new researchers to proceed further in this field.


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