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Shumaila Islam,Rosly Rahman,ZULKAFLI OTHAMAN,Saira Riaz,Shahzad Naseem 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
Films of multi-organic indicators, encapsulated in silica–titania hybrid matrix with CTAB, have beensynthesized using sol–gel dip coating method. Two types of stable,dense and uniform matrices wereannealed at a 150 ℃ within two time intervals 1 h and 2 h by using 0.1 M and 0.5 M indicatorconcentrations. Nanoparticles are uniformly distributed with size in the range from 15–28 nm. Matriceshave high surface area (418.18–441.30 m2/g), which has more capability to sense the broader pH range. Spectroscopic studies showed the establishment of heterogeneous chemical bonding which indicative ofstability of matrices with 69% porosity. The response of the sensor is optimum at pH 9.
Synthesis and characterization of multilayered sol–gel based plastic-clad fiber optic pH sensor
Shumaila Islam,Rosly Abdul Rahman,Zulkafli Bin Othaman,Saira Riaz,Shahzad Naseem 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
The fabrication and characterization of an optical fiber pH sensor for the detection range 3–11 are described. The sensing element consists of a combination of indicators encapsulated in mesoporous surfactant based hybrid matrix, which are deposited onto an uncladed plastic optical fiber. Stable, dense and uniform sol–gel cladding with more than 90% transparency in the visible range are observed. Roughness value 9.7–6.57 nm is obtained by AFM. Film thickness, refractive index, and porosity are found to vary with number of coatings, 70% porosity is determined with 116 nm thickness. The response of the sensor with third layer is observed in acid and basic medium.
Sol–gel based phenolphthalein encapsulated heterogeneous silica–titania optochemical pH nanosensor
Shumaila Islam,Noriah Bidin,Saira Riaz,Shahzad Naseem 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
Thermally stable phenolphthalein encapsulated silica–titania nanomatrix is fabricated by sol–gelmethod for optochemical pH sensing. The particle size 56–121 nm is obtained with average surfaceroughness of 3.95 nm after the encapsulation of dye which is highly appropriate for optical and sensingapplications. High surface area value 218 m2/g, pore volume of 0.16 cm3/g and pore diameter of31.49 A˚ is obtained after encapsulation. Furthermore, the sensor response is optimized at pH 10. Fastresponse time 1–2 s, sensitivity with good reproducibility identify that the fabricated optochemicalnanosensor is challenging for the detection of pH at room temperature.
Aziz Muhammad Safwan,Islam Shumaila,Rosli Muhammad Izz,Basar Norazah,Krishnan Ganesan,Duralim Maisarah,Harun Sulaiman Wadi 한국물리학회 2022 Current Applied Physics Vol.39 No.-
Nonlinear optical properties of Coumarin-based compounds i.e., 3-acetyl-7-iethylaminocoumarin (C3) and 7-Ethylamino-4-trifluoromethylcoumarin (C500) is reported by Z-scan technique (Nd: YAG Continuous-wave 532 nm). The conventional C500 compound exhibited NLR properties in the order of n2 = 10–9, whereas the synthesized C3 compound manifested both NLR and NLA properties around n2 = 10–9 and β = 10–4, respectively. The results are obtained from different laser power PC500 = 0.10–0.18 W, while PC3 = 0.20–0.28 W. Both compounds provided excellent NLO attributes at consistent and stable outputs of open and closed-aperture signals, resulted in eminence of NLR and NLA values. The C3 compound is manifested reverse saturable absorption, optical limiting properties, and threshold at 0.3814 W. The exclusivity of NLR in C500 makes it suitable to develop as an optical switcher while synthesized C3 compound is more suitable as an optical limiter for safety.