Nano-like magnesium oxide films and its significance in optical fiber humidity sensor

Shukla, Shipra; Parashar, G. K.; Mishra, Anoop Kumar; Misra, Pankaj; Yadav, B. C.; Shukla, R. K.; Bali, L. M.; Dubey, G. C.

doi:10.1016/j.snb.2003.05.001

Cited by 106 publications

(54 citation statements)

References 28 publications

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“…Nano-MgO is a functional material that has been widely used in various areas (Shukla et al, 2004). Recently, it has been reported Yamamoto et al, 2000) that MgO has good bactericidal performance in aqueous environments due to the formation of superoxide O -2 anions on its surface.…”

Section: Introductionmentioning

confidence: 99%

Nanosize MgO as antibacterial agent: preparation and characteristics

Tang

Fang

Zhang

et al. 2012

Braz. J. Chem. Eng.

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-The antibacterial activity of MgO nanoparticles prepared by a sonication method was evaluated in this paper. The effect of calcination conditions on the size and antibacterial activity of MgO nanoparticles was investigated. MgO nanoparticles were characterized for purity (TGA), crystallinity and crystal size (XRD), particle size and morphology (TEM) and surface area (BET). Results showed that the smallest size of 6 nm could be obtained. The lethal effects of nanocrystalline MgO were evaluated on Lactobacillus plantarum. At a concentration of 100 ppm, the killing effect of MgO was close to 1 log reduction for L. plantarum after 24 h exposure. At 1000 ppm and 24 h exposure, the killing effect of MgO was more than a 2.8 log reduction. With the increase of calcination time, the lethal effect of MgO nanoparticles increased after 6 h or 24 h exposure at 100 ppm or 1000 ppm. 2.86 log and 2.89 log were killed at 1000 ppm after 24 h exposure using the sample MgO, sonication, A, and the sample MgO, sonication, B, respectively. When the sample MgO, sonication, C, was used, the lethal quantity of L. plantarum was increased to a 3.36 log reduction.

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Section: Introductionmentioning

confidence: 99%

Nanosize MgO as antibacterial agent: preparation and characteristics

Tang

Fang

Zhang

et al. 2012

Braz. J. Chem. Eng.

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“…This has motivated a large number of researchers to propose and demonstrate various kinds of optical and non-optical humidity sensors, employing different operating concepts and test materials. [1][2][3][4][5][6][7][8][9][10][11][12][13] Bownass et al 14) successfully demonstrated that polyethylene oxide can be used to detect humidity in passive optical networks at around the single value of 80% RH for optical telecommunication wavelengths between 1.1 and 1.55 mm. The sensing mechanism is based on the humidityinduced change in the refractive index of the polyethylene oxide overlay on a polished surface of a half-block singlemode fibre device.…”

Section: Introductionmentioning

confidence: 99%

Use of polyethylene glycol coatings for optical fibre humidity sensing

Acikgoz

Bilen

Demir

et al. 2008

OPT REV

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Humidity induced change in the refractive index and thickness of the polyethylene glycol (PEG) coatings are in situ investigated for a range from 10 to 95%, using an optical waveguide spectroscopic technique. It is experimentally demonstrated that, upon humidity change, the optical and swelling characteristics of the PEG coatings can be employed to build a plastic fibre optic humidity sensor. The sensing mechanism is based on the humidity induced change in the refractive index of the PEG film, which is directly coated onto a polished segment of a plastic optical fibre with dipcoating method. It is observed that PEG, which is a highly hydrophilic material, shows no monotonic linear response to humidity but gives different characteristics for various ranges of humidity levels both in index of refraction and in thickness. It undergoes a physical phase change from a semi-crystalline structure to a gel one at around 80% relative humidity. At this phase change point, a drastic decrease occurs in the index of refraction as well as a drastic increase in the swelling of the PEG film. In addition, PEG coatings are hydrogenated in a vacuum chamber. It is observed that the hydrogen has a preventing effect on the humidity induced phase change in PEG coatings. Finally, the possibility of using PEG coatings in construction of a real plastic fibre optic humidity sensor is discussed.

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“…Nano-MgO is a functional material that has been widely used in various areas [1,2]. Recently, it has been reported [3,4] that MgO has good bactericidal performance in aqueous environments due to the formation of superoxide ðO À 2 Þ anions on its surface.…”

Section: Introductionmentioning

confidence: 99%