Elucidation of the pore size and temperature dependence of the oxygen diffusion into porous silicon

Gelir, Ali; Yargı, Önder; Yuksel, Süreyya Aydın

doi:10.1016/j.tsf.2017.07.007

Cited by 10 publications

(2 citation statements)

References 25 publications

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“…Oxygen molecules are consumed in the process of photooxidation. At the same time, the rate of renewal of their concentration in the PSi matrix is limited by the diffusion coefficient 21 . Apparently, if Iex values are greater than 0.2 W/cm2, diffusion does not fully maintain the concentration of oxygen molecules at the entire depth of the microcavity.…”

Section: Resultsmentioning

confidence: 99%

Photostability of luminophores sensitive to vapors of nitroaromatic compounds in a porous silicon microcavity

Kharinoeva

Мартынов²,

Osipov³

et al. 2022

Counterterrorism, Crime Fighting, Forensics, and Surveillance Technologies VI

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Currently, luminescent sensors for detecting vapors of nitroaromatic compounds and other explosives are being actively developed. In practice, the stability of the luminescence signal of the sensor is of great importance. In this work we study photostability of sensitive luminophore embedded in porous silicon microcavities under exciting at a wavelength of 450 nm. As the sensitive luminophore we used Poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMOPPV). It was found that the rate of photodegradation of MDMO-PPV luminescence depends nonlinearly on the intensity of the exciting radiation. Apparently, the observed effect is related to the limited rate of diffusion of oxygen molecules into the porous silicon. Additionally, similar studies were carried out for MDMO-PPV films on a glass substrate. It is shown that in this case the photostability of the luminophore decreases by several times. Based on the data obtained, the operating modes of the sensor element are analyzed.

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Section: Resultsmentioning

confidence: 99%

Photostability of luminophores sensitive to vapors of nitroaromatic compounds in a porous silicon microcavity

Kharinoeva

Мартынов²,

Osipov³

et al. 2022

Counterterrorism, Crime Fighting, Forensics, and Surveillance Technologies VI

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“…Chemical modification is often carried out to enhance the interfacial compatibilities between nanocellulose and natural rubber and to alleviate difficulties in dispersing them in polar solvents or polymers [ 49 ]. Hydroxyl groups are the sole functional group that exists in nanocellulose and therefore the surface modification of nanocellulose is highly dependent of the reactivity of these functional groups.…”

Section: Surface Modification Of Nanocellulose For Natural Rubber Nanocompositesmentioning

confidence: 99%

Surface Modified Nanocellulose and Its Reinforcement in Natural Rubber Matrix Nanocomposites: A Review

et al. 2021

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Natural rubber is of significant economic importance owing to its excellent resilience, elasticity, abrasion and impact resistance. Despite that, natural rubber has been identified with some drawbacks such as low modulus and strength and therefore opens up the opportunity for adding a reinforcing agent. Apart from the conventional fillers such as silica, carbon black and lignocellulosic fibers, nanocellulose is also one of the ideal candidates. Nanocellulose is a promising filler with many excellent properties such as renewability, biocompatibility, non-toxicity, reactive surface, low density, high specific surface area, high tensile and elastic modulus. However, it has some limitations in hydrophobicity, solubility and compatibility and therefore it is very difficult to achieve good dispersion and interfacial properties with the natural rubber matrix. Surface modification is often carried out to enhance the interfacial compatibilities between nanocellulose and natural rubber and to alleviate difficulties in dispersing them in polar solvents or polymers. This paper aims to highlight the different surface modification methods employed by several researchers in modifying nanocellulose and its reinforcement effects in the natural rubber matrix. The mechanism of the different surface medication methods has been discussed. The review also lists out the conventional filler that had been used as reinforcing agent for natural rubber. The challenges and future prospective has also been concluded in the last part of this review.

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Improved biohydrogen production by co-cultivation of N2-fixing cyanobacterium Fischerella muscicola TISTR 8215 and microalga Chlorella sp.

Wutthithien

Incharoensakdi

2022

J Appl Phycol

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Elucidation of the pore size and temperature dependence of the oxygen diffusion into porous silicon

Cited by 10 publications

References 25 publications

Photostability of luminophores sensitive to vapors of nitroaromatic compounds in a porous silicon microcavity

Photostability of luminophores sensitive to vapors of nitroaromatic compounds in a porous silicon microcavity

Surface Modified Nanocellulose and Its Reinforcement in Natural Rubber Matrix Nanocomposites: A Review

Improved biohydrogen production by co-cultivation of N2-fixing cyanobacterium Fischerella muscicola TISTR 8215 and microalga Chlorella sp.

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