• Title/Summary/Keyword: rhodamine-B

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Surface Plasmon Enhanced Photoluminescence of Rhodamine B Confined in SBA15

  • Dinakaran, K.;Chandramohan, A.;Venkatesan, M.R.;Devaraj, S.;Devi, V.;Alagar, M.
    • Bulletin of the Korean Chemical Society
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    • v.32 no.11
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    • pp.3861-3864
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    • 2011
  • Rhodamine B dye (RB) has been introduced into the mesoporous silica (SBA15) and Ag anchored mesoporous silica by applying solution impregnation method. Surface treatment of SBA15 with 3-aminopropyltrimethoxysilane (APTMS) facilitates selective anchoring of the RB molecules on SBA15. The photoluminescence spectra of RB confined within SBA15 indicates higher emission intensity, than that of the RB solid, particularly in the presence of Ag nanoparticles. The significant enhancement in photoluminescence intensity is attributed to the local enhancement of the optical fields near the molecules by interactions with silver plasmons.

A Marking Technique for Exorista bombycis(Louis) (Diptera:Tachinidae) by Adding Dye to the Adult Diet

  • Swamy, K.C.Narayana;Devaiah, M.C.;Govindan, R.
    • Journal of Sericultural and Entomological Science
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    • v.35 no.1
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    • pp.73-76
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    • 1993
  • Adding a non-fluorescent dye, Rhodamine-B, to the adult diet of uzi fly, Exorista bombysis (Louis) has shown to be a useful method for marking the eggs for flight range experiments. The method is timesaving and the dye is safe to handle and the marked eggs are easy to detect. Files fed on the diet added with dye did not have much negative effect on adult mortality and fecundity, but egg hatchability was affected.

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Effect of Liposome Encapsulation on Intestinal Absorption of Rhodamine 123 (리포솜 봉입이 로다민 123의 소장 흡수에 미치는 영향)

  • Hong, Soon-Sun;Lee, Hae-Ree;Li, Hong;Chung, Suk-Jae;Kim, Dae-Duk;Shim, Chang-Koo
    • YAKHAK HOEJI
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    • v.49 no.2
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    • pp.185-191
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    • 2005
  • The absorption of a P-gp substrate, rhodamine 123, from a liposomal dosage form was investigated across Caco-2 cell monolayers, rat intestines and rat intestinal Peyer's patches in Ussing chamber, Rhodamine 123 was incorporated into liposomes according to the standard evaporation method, which led to a production of liposomes with a mean diameter of 71.3 nm. The permeability (Papp of rhodamine 123 from a water solution across the monolayer was $2.45{\times}10^{-6}$ cm/s for $A{\leftrightarrow}B$ (apical to basal) and $14.0{\times}10^{-6}$ cm/s for $B{\leftrightarrow}A$ (basal to apical) directions, consistent with the fact that rhodamine 123 is one of the P-gp substrates. The transport of rhodamine 123 from the liposomal dosage form was much lower for both directions compared to the solution of rhodamine 123. The transport of rhodamine 123 across the rat intestine was also significantly decreased for both directions, I.e., influx and efflux, by the liposomal incorporation of the compound. The transport of rhodamine 123 across the Peyer's patch was substantially reduced by liposomal incorporation. No difference was found in the transport between the Peyer's patch and non-Peyer's patch. These observations suggest that the contribution of transport via Peyer's patches in the uptake of liposomes may be minimal, especially for rapidly absorbed compounds like rhodamine 123. Therefore, the increased absorption of P-gp substrates does not appear to be feasible by incorporating the compounds in liposomes, due to negligible involvement of Peyer's patches in the uptake of particulate dosage forms like liposomes. Liposomes may rather represent a sustained release dosage form of incorporated compounds.

Decolorization of Rhodamine B by Fenton, Fonton-like and Photo-Fenton-like Oxidation (펜톤, 펜톤-유사 및 광-펜톤-유사 반응을 이용한 Rhodamine B의 탈색)

  • Kim, Dong-Seog;Park, Young-Seek
    • Journal of Environmental Health Sciences
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    • v.33 no.2 s.95
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    • pp.150-157
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    • 2007
  • The chemical and photochemical decolorization of Rhodamine B (RhB) in water has been carried out by Fenton, Fenton-like and photo-Fenton-like process. The effect of applied $H_2O_2,\;Fe^{2+}$ dosage (Fenton process), $H_2O_2,\;Fe^{\circ}$ dosage (Fenton-like and photo-Fenton-like process), UV light power (photo-Fenton-like process) pH (all processes) have been studied. The results obtained showed that more than 98% of color removal was obtained for the RhB solutions in every process. However, Fenton-like process was not suitable for the color removal of RhB because Fenton-like process was required much more reagents than Fenton and photo-Fenton-like process. The Fenton and photo-Fenton-like process showed similar reagents need. Optimum pH for three processes in this study is about pH 3. The relative order of sensitivity for pH of each process was: Fenton-like > photo-Fenton-like > Fenton.

Color Removal of Rhodamine B by Photoelectrocatalytic Process Using Immobilized TiO2 (고정화 광촉매를 이용한 광전기촉매 공정에서 Rhodamine B의 색도 제거)

  • Kim, Dong-Seog;Park, Young-Seek
    • Journal of Environmental Health Sciences
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    • v.34 no.3
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    • pp.226-232
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    • 2008
  • A feasibility study for the application of the photoelectrocatalytic decolorization of Rhodamine B (RhB) was performed in a photoelectrochemical reactor with immobilized $TiO_2$ particle. The effects of operating conditions, such as current, electrolyte and pH were evaluated. The experimental results showed that optimum $TiO_2$ dosage and current in the photoelectrocatalytic process were 83.3 g/l and 0.5 A, respectively. It was found that the RhB could be degraded more efficiently by this photoelectrocatalytic process than the sum of the two individual oxidation processes (photocatalytic and electrolytic process). The addition of NaCl increased the initial decolorization rate and reduced reaction time. The optimum dosage of NaCl was 0.15 g/l. The decolorization rate of the photoelectrocatalytic process increased sharply with a decrease in pH value. However when the NaCl was added, the pH effect was not high.

Synthesis and optical determination of chemosensor toward Cu(II) and Hg(II)

  • Yu, Hyung-Wook;Wang, Sheng;Son, Young-A
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • 2011.03a
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    • pp.68-68
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    • 2011
  • A new chemosensor based on rhodamine B (1) for $Hg^{2+}$ and $Cu^{2+}$ was synthesized by one-step condensation reaction of rhodamine B hydrazide and Azo dye. Studying for its fluorogenic and colorimetric behaviors towards various metal ions, extreme sensitivity and selectivity were achieved by the detection of $Hg^{2+}$ and $Cu^{2+}$ over other commonly coexistent metal ions, which were accompanied by ring opening of a rhodamine spirocycle framework. In acetonitrile, the presence of $Hg^{2+}$ and $Cu^{2+}$ induces the formation of a Dye 1-ion complex, which was deduced by spectroscopy.

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Rhodamine B Hydrazide Revisited: Chemodosimetric Hg2+-selective Signaling Behavior in Aqueous Environments

  • Kim, Kyoung-Nam;Choi, Myung-Gil;Noh, Jae-Hyun;Ahn, Sang-Doo;Chang, Suk-Kyu
    • Bulletin of the Korean Chemical Society
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    • v.29 no.3
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    • pp.571-574
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    • 2008
  • The well-known Cu2+-selective chemodosimetric behavior of rhodamine B hydrazide was successfully switched to selectivity for Hg2+. The fluorescence signaling is remarkably selective toward Hg2+ ions compared to other common biologically and environmentally important metal ions, including Cu2+ ions. The detection limit was 0.2 mM in an acetate-buffered aqueous 10% methanol solution at pH 5. The OFF-ON type of signaling is due to the selective Hg2+-induced hydrolysis of the lactam ring of the hydrazide as has been reported for the standard Cu2+-signaling process of the same compound. A simple change in medium resulted in clear switching of selective signaling from Cu2+ to Hg2+, which extends the applicability of the easily accessible hydrazide derivative.

Tune Metal Ion Selectivity by Changing Working Solvent: Fluorescent and Colorimetric Recognition of Cu2+ by a Known Hg2+ Selective Probe

  • Tang, Lijun;Guo, Jiaojiao;Huang, Zhenlong
    • Bulletin of the Korean Chemical Society
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    • v.34 no.4
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    • pp.1061-1064
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    • 2013
  • A known $Hg^{2+}$ selective rhodamine B derivatised probe 1 was reinvestigated as a colorimetric and fluorescent probe for $Cu^{2+}$ through changing the applied solvent media. Probe 1 exhibited good selectivity and sensitivity to $Cu^{2+}$ in $CH_3CN-H_2O$ (7:3, v/v, HEPES 10 mM, pH 7.0) solution with a detection limit of $9.74{\times}10^{-7}$ M. The $Cu^{2+}$ sensing event was proved to be irreversible through hydrolysis of 1 to release rhodamine B.

Photocatalytic Degradation of Rhodamine B Using Carbon-Doped Carbon Nitride under Visible Light

  • Wang, Zhong-Li;Zhang, Zai-Teng;Oh, Won-Chun
    • Korean Journal of Materials Research
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    • v.30 no.6
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    • pp.279-284
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    • 2020
  • In this work, a carbon-doped carbon nitride photocatalyst is successfully synthesized through a simple centrifugal spinning method after heat treatment. The morphology and properties of the prepared photo catalyst are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis spectrophotometer (UV-vis), and specific surface area. The results show that the band gap of the prepared sample, g-CN-10 is 2.1 eV, is significantly lower than that of pure carbon nitride, 2.7 eV. As the amount of cotton candy increased, the absorption capacity of the prepared catalyst for visible light is significantly enhanced. In addition, the degradation efficiency of Rhodamine B (RhB) by sample g-CN-10 is 98.8 % over 2 h, which is twice that value of pure carbon nitride. The enhancement of photocatalytic ability is attributed to the increase of specific surface area after the carbon doping modifies carbon nitride. A possible photocatalytic degradation mechanism of carbon-doped carbon nitride is also suggested.