Organically modified silicate thin films doped with colourimetric pH indicators methyl red and bromocresol green as pH responsive sol–gel hybrid materials

Jurmanović, Stella; Kordić, Šimo; Steinberg, Matthew D.; Steinberg, Ivana Murković

doi:10.1016/j.tsf.2009.07.158

Cited by 78 publications

(34 citation statements)

References 34 publications

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“…Bromocresol Green (BCG) is a pH sensitive triphenylmethane dye useful in a variety of colorimetric detection technologies. BCG is used as a tracking dye for DNA agarose gel electrophoresis, in protein determinations and in charge-transfer complexation processes, BGC melting point is 225 o C and the peak absorption in 423 nm [8,9]. Poly methyl methacrylate (PMMA) polymer was purchased from (Sigma -Aldrich) and used as host material for laser dye due to its excellent optical properties.…”

Section: Materials and Samples Preparationmentioning

confidence: 99%

Linear Optical Properties of Bromocresol Green Dye Doped Poly Methyl Methacrylate Thin Films

Almusawe

Hassen

Rahma

et al. 2018

ijs

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In this study, we investigated the effect of Bromocresol green dye (BCG) of the PMMA thin films optical properties. Films of Poly Methyl Methacrylate doped by 10% BCG doping ratio to prepared two concentrations 2x10 -4 and 6x10 -4 M of PMMA-BCG dye were deposited on glass substrate using free casting method at room temperature. The optical properties of the films were determined using UVVisible absorbance and transmittance spectra at the 300 -900 nm wavelength range. The linear absorption coefficient and the extinction coefficient were calculated. The results showed that the optical properties were increasing by increasing the dye concentration, while the optical energy gap was decreasing with the doping. Also from the linear optical properties result the PMMA-BGC thin films are a promised materials for nonlinear optics applications. ISSN: 0067-2904Almusawe et al. Science, 2018, Vol. 59, No.1B, pp: 299-306 Iraqi Journal of 300 IntroductionOrganic dye doped polymers have a great deal of concern in recent years due to their great potential in many important applications such as optical storage, optical switching, optical limiting, signal processing, optical modulators, holography and nonlinear optical devices as well as various kinds of photonic devices [1][2][3]. The unique properties of polymers such as low density, ability to form intricate shapes, good mechanical strength versatile, electrical properties and low manufacturing cost made them promising materials that have been successfully used as host matrices for dyes. The wide range of polymer applications can be even more extensive by incorporation of filler into polymer matrix, because dispersed filler may increase the concentration of absorptive or fluorescence centers as well as the opto-chemical and opto-physical stability of host polymer [4][5][6][7].In this study, we present the effect of Bromocresol green dye (BCG) on the optical properties of poly methyl methacrylate (PMMA) polymeric matrix (guest -host system). Poly methyl methacrylate (PMMA) is a transparent plastic material with high solidity, durability and flexibility [6].The optical properties such as absorption coefficient, refractive index and optical energy band gap of dye doped polymers were investigated using spectroscopic absorbance combined with transmittance measurements. Materials and Samples PreparationThe Bromocresol green dye was obtained from (Sigma -Aldrich) with a molecular formula of C 21 H 14 Br 4 O 5 S and its chemical structure is depicted in Figure-1. The bromo group can improve the transparency and the thermal stability of compounds. Bromocresol Green (BCG) is a pH sensitive triphenylmethane dye useful in a variety of colorimetric detection technologies. BCG is used as a tracking dye for DNA agarose gel electrophoresis, in protein determinations and in charge-transfer complexation processes, BGC melting point is 225 o C and the peak absorption in 423 nm [8,9]. Poly methyl methacrylate (PMMA) polymer was purchased from (Sigma -Aldrich) and used as host material ...

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Section: Materials and Samples Preparationmentioning

confidence: 99%

Linear Optical Properties of Bromocresol Green Dye Doped Poly Methyl Methacrylate Thin Films

Almusawe

Hassen

Rahma

et al. 2018

ijs

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“…And precision of 0.2 pH units was reported. A TEOS-GLYMO-based matrix was also investigated for use in optical pH sensing by Jurmanovic et al [104]. Over forty different sol-gel formulations and 2 different pH indicators such as bromocresol green and methyl red were tested.…”

Section: Absorption-based Ph Co 2 and Nh 3 Sensorsmentioning

confidence: 99%

Micro- and nanostructured sol-gel-based materials for optical chemical sensing (2005–2015)

2016

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This review (with 172 references) highlights the progress made in the past 10 years in silica sol-gel-based materials for use in optical chemical sensing. Following an introduction, the processes leading to the sol-gel-based and ormosil materials, their printability and methods for characterisation are discussed. Then various classes of optical sensors, with a focus on sensors for pH values, oxygen, carbon dioxide, ammonia (also in dissolved form), and heavy metal ions are described. A further section covers nanoparticle-based optical sensors mainly for use in intracellular sensing of the above species. Recent developments in this area are also emphasised and future trends discussed.

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“…They are synthetized under normal temperature and pressure conditions and silica gels are approved by the Food and Drug Administration (FDA) [7,8], being equally DOI: http://dx.doi.org/10.21454/rjaic.7518/232.vit tolerated by the human organism in oral, interstitial or topical administration. Porous silica gels are obtained by condensation and polycondensation of hydroxylated units obtained through the hydrolysis of some precursors [9,10]. Based on the precursor selection, various inorganic or hybrid matrices can be obtained, with different properties such as biofunctionality, controllable porosity, high mechanical and thermal stability and different surface tensions.…”

Section: Introductionmentioning

confidence: 99%

An in vitro study of the release capacity of the local anaesthetics from siloxane matrices

Preda

Rogobete

Săndesc

et al. 2016

Rom J Anaesth Int Care

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Aims. In the field of anaesthesia and intensive care, the controlled release systems capable of delivering constantly local anaesthetics are of interest because of the advantages brought to pain management. In this paper we presented the release profiles by usage of siloxane matrices of two common local anaesthetics, lidocaine and bupivacaine, analysed in vitro.Methods. The siloxane matrices were obtained in accordance with the methods described in the specialized literature, tetraethoxysilane (TEOS) and tetramethoxysilane (TMOS) were used as precursors. Lidocaine and bupivacaine were encapsulated in the synthesized gels. The controlled release was performed in vitro artificial systems in which temperature (30°C, 36.5°C, 40°C) and pH (6, 7, 8) have varied.Results. Following the analysis of the artificial systems similar profiles were highlighted for both local anaesthetics. Statistically significant differences were identified (p < 0.05) for systems where the release occurred at temperatures above 36.5°C. There were no statistically significant differences regarding the influence of pH, the type of the entrapped anaesthetic or the type of the precursor used in the synthesis of siloxane matrices.Conclusions. According to this experimental study, the pH, the type of precursor or the type of anaesthetic does not statistically influence the release profile from the studied system. In conclusion, these systems are promising for obtaining pharmaceutical preparations which can be used in current clinical practice. Several studies on controlled release siloxane systems should be carried out both in vitro and in vivo in order to exclude possible toxicity and histopathological effects.

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Organically modified silicate thin films doped with colourimetric pH indicators methyl red and bromocresol green as pH responsive sol–gel hybrid materials

Cited by 78 publications

References 34 publications

Linear Optical Properties of Bromocresol Green Dye Doped Poly Methyl Methacrylate Thin Films

Linear Optical Properties of Bromocresol Green Dye Doped Poly Methyl Methacrylate Thin Films

Micro- and nanostructured sol-gel-based materials for optical chemical sensing (2005–2015)

An in vitro study of the release capacity of the local anaesthetics from siloxane matrices

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