Relevant bibliographies by topics / Stern-Volmer Plot

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Academic literature on the topic 'Stern-Volmer Plot'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Stern-Volmer Plot"

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Sidarai, Ashok H., Vani R. Desai, Shirajahammad M. Hunagund, Mahantesha Basanagouda, and Jagadish S. Kadadevarmath. "Effect of solvent polarity on the fluorescence quenching of TMC molecule by aniline in benzene–acetonitrile mixtures." Canadian Journal of Physics 94, no. 11 (November 2016): 1125–32. http://dx.doi.org/10.1139/cjp-2016-0213.

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The fluorescence quenching of coumarin derivative, 6-methoxy-4-p-tolyloxymethyl-chromen-2-one by aniline is carried out in different solvent mixtures of benzene and acetonitrile at room temperature. The quenching is found to be appreciable and a positive deviation from linearity is observed in the Stern–Volmer plot in all the solvent mixtures. Various rate constants for fluorescence quenching processes have been estimated using a sphere of action static quenching model and a finite sink approximation model. From the positive deviation of linear Stern–Volmer plots and dependence of rate constants on the polarity of the solvents, it has been inferred that the quenching process is diffusion-limited, and static as well as dynamic quenching processes are responsible for the observed positive deviation in the Stern–Volmer plot. Further, both models have been found to agree well with transient state also in pure acetonitrile and benzene solvents.
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Thipperudrappa, J., and S. M. Hanagodimath. "Analysis of Fluorescence Quenching of BPBD by Aniline in Toluene." Mapana - Journal of Sciences 12, no. 1 (February 13, 2013): 87–98. http://dx.doi.org/10.12723/mjs.24.8.

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Fluorescence quenching of 2-(4'-t-Butylphenyl)-5-(4"-biphenylyl)-1,3,4-oxadiazole (BPBD) by aniline in toluene has been carried out at room temperature by steady state and time resolved fluorescence spectroscopy. The Stern-Volmer plot by steady state method has been found to be non-linear showing a positive deviation, whereas by time-resolved method it is linear. In order to interpret these results we have used the ground state complex and sphere of action static quenching models. Using these models various rate parameters have been determined. Based on these models, with finite sink approximation model, we conclude that positive deviation Stern-Volmer plot is due to the simultaneous presence of dynamic and static quenching processes.
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Yang, Yu, and Edward P. C. Lai. "Optimization of Molecularly Imprinted Polymer Method for Rapid Screening of 17β-Estradiol in Water by Fluorescence Quenching." International Journal of Analytical Chemistry 2011 (2011): 1–8. http://dx.doi.org/10.1155/2011/214747.

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A new method was optimized for rapid screening of 17β-estradiol (E2) in water under 10 min. Molecularly imprinted polymer (MIP) particles (325 ± 25 nm) were added in a water sample at pH 5.5 and 20∘C to form a suspension. Fluorescence emission from E2 nonspecifically bound onto the MIP particles was first quenched by large gold nanoparticles (43 ± 5 nm). The Stern-Volmer plot was linear, with dynamic quenching constants (Ksv) of 2.9 ×104 M-1. Fluorescence emission from E2 specifically bound inside the MIP particles was next quenched by small nitrite anions that easily penetrated the imprinted cavities. The Stern-Volmer plot became nonlinear, withKsv= 2.1 × 102 M-1and static quenching constant (V) below 1.0 M-1. The difference between these two emission intensities varied as the initial E2 concentration in water, generating a Scatchard calibration curve withR2>0.97from 0.1 to 10 ppb.
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Janosi, Tibor Zoltan, Jouko Korppi-Tommola, Zsolt Csok, Laszlo Kollar, Pasi Myllyperkio, and Janos Erostyak. "Anthracene Fluorescence Quenching by a Tetrakis (Ketocarboxamide) Cavitand." Journal of Spectroscopy 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/708739.

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Quenching of both fluorescence lifetime and fluorescence intensity of anthracene was investigated in the presence of a newly derived tetrakis (ketocarboxamide) cavitand at various concentrations. Time-correlated single photon counting method was applied for the lifetime measurements. A clear correlation between the fluorescence lifetime of anthracene as a function of cavitand concentration in dimethylformamide solution was observed. The bimolecular collisional quenching constant was derived from the decrease of lifetime. Fluorescence intensity was measured in the emission wavelength region around 400 nm as a result of excitation at 280 nm. Effective quenching was observed in the presence of the cavitand. The obtained Stern-Volmer plot displayed upward curvature. The results did not follow even extended Stern-Volmer behavior, often used to describe deviations from static bimolecular quenching. To explain our results we adopted the Smoluchowski model and obtained a reasonable estimate for the molecular radius of the cavitand in solution.
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Pan, Bo, Baoshan Xing, Wenxin Liu, Guanhua Xing, and Shu Tao. "Investigating interactions of phenanthrene with dissolved organic matter: Limitations of Stern–Volmer plot." Chemosphere 69, no. 10 (November 2007): 1555–62. http://dx.doi.org/10.1016/j.chemosphere.2007.05.059.

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6

Hamity, M., and R. H. Lema. "The photochemistry of electron donor–acceptor (EDA) complexes in micellar solutions. I. The stilbene–methylviologen system." Canadian Journal of Chemistry 66, no. 7 (July 1, 1988): 1552–57. http://dx.doi.org/10.1139/v88-252.

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The association constants for the electron donor–acceptor (EDA) complexes formed between both cis-stilbene (cS) and trans-stilbene (tS) as donors and methylviologen (MV+2) as acceptor were determined in ethanol and micellar sodium dodecyl sulfate (SDS) solutions in the range of SDS concentration 0.05–0.1 M. The values obtained in micellar solutions were much higher than those in ethanol and were heavily dependent upon SDS concentration. This effect is due to an increase in the local concentration of the reactants in the micellar pseudophase. The tS fluorescence quenching by MV+2 was also studied in the same solvent media. In ethanol, the Stern–Volmer plot was found to be linear, with quenching constant (KSV) similar to the association constant determined by the absorption method. In micellar solutions, although upward curvature of the Stern–Volmer plots was observed, a reaction scheme based on static quenching via ground state EDA complex is proposed, which explains the experimental results. Irradiation in the absorption band of the EDA complexes formed by tS or cS and MV+2 was carried out in ethanol and SDS solutions, in the absence of oxygen. Only cis–trans isomerization of cS in SDS solution was observed, with a quantum yield value of Φcis = 0.012.
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Ciotta, E., P. Prosposito, and R. Pizzoferrato. "Positive curvature in Stern-Volmer plot described by a generalized model for static quenching." Journal of Luminescence 206 (February 2019): 518–22. http://dx.doi.org/10.1016/j.jlumin.2018.10.106.

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Sidarai, Ashok H., Vani R. Desai, Shirajahammad M. Hunagund, Mahantesha Basanagouda, and Jagadish S. Kadadevarmath. "Fluorescence Quenching of DMB by Aniline in Benzene-Acetonitrile Mixture." International Letters of Chemistry, Physics and Astronomy 65 (April 2016): 32–36. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.65.32.

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The fluorescence quenching of coumarin dye namely 4-(2,6-dibromo-4-methyl-phenoxymethyl)-benzo[h]chromen-2-one [DMB] has been studied by aniline, in a different solvent mixture of benzene (BN) and acetonitrile (AN) at room temperature. The quenching is found to be appreciable and shows positive deviation from linearity in the Stern-Volmer (S-V) plots for all the solvent mixtures. The various rate parameters responsible for fluorescence quenching have been determined using a sphere of action static quenching model and finite sink approximation model. The magnitudes of these rate parameters indicate that positive deviation in the S-V plot is due to both static and dynamic quenching processes.
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Thanikaivalan, E., and R. Jothilakshmi. "Quenching of Silver Nanoparticles." Materials Science Forum 781 (March 2014): 135–44. http://dx.doi.org/10.4028/www.scientific.net/msf.781.135.

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Silver nanoparticles of different sizes have been prepared. Absorption spectroscopy reveals the formation of ground state complex. Fluorescence spectroscopy has been used to study the signatures of fluorescence quenching. Properties of N-(2-methylthiophenyl)-2-hydroxy-1-naphthaldimine (NMTHN) on silver nanoparticles has been investigated using optical absorption and fluorescence emission techniques. Quenching of fluorescence of N-(2-methylthiophenyl)-2-hydroxy-1-naphthaldimine has been found to decrease with increase in the size of the silver nanoparticles. The results of the quenching experiments were analyzed through Stern Volmer plot.
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AMAO, YUTAKA, KEISUKE ASAI, and ICHIRO OKURA. "Oxygen sensing based on lifetime of photoexcited triplet state of platinum porphyrin-polystyrene film using time-resolved spectroscopy." Journal of Porphyrins and Phthalocyanines 04, no. 03 (April 2000): 292–99. http://dx.doi.org/10.1002/(sici)1099-1409(200004/05)4:3<292::aid-jpp216>3.0.co;2-w.

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Optical oxygen-sensing systems based on the quenching of the photoexcited triplet state of platinum porphyrins—platinum octaethylporphyrin (PtOEP) and platinum tetrakis(pentafluorophenyl)porphyrin (PtTFPP)—in polystyrene (PS) using two different time-resolved spectroscopies (luminescence lifetime measurement and diffuse reflectance laser flash photolysis) have been developed. Using both spectroscopies, the same values of Stern-Volmer constant KSV and quenching rate constant kq (KSV = kqτ0) are obtained. The decays of the luminescence and triplet-triplet reflectance of the platinum porphyrins in PS consisted of two components (faster and slower lifetimes) in the absence and presence of oxygen. For both faster and slower components the lifetime decreases with increasing oxygen concentration. For both components a Stern-Volmer plot of the platinum porphyrin-PS films exhibits linearity. However, kq of the faster component is larger than that of the slower component (for PtOEP, three times larger; for PtTFPP, 40 times larger), indicating that two different oxygen-accessible sites exist in the platinum porphyrin-PS films. The faster and slower components are related to oxygen-accessible sites on the surface and in the bulk of the platinum porphyrin films respectively. Concerning the fractional contributions of each lifetime component, the contribution of the faster component is greater than that of the slower component, indicating that the sensing site on the surface is important for optical sensing. The contribution of different oxygen-accessible sites in platinum porphyrin-PS films for oxygen sensing is clarified by these techniques.
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Dissertations / Theses on the topic "Stern-Volmer Plot"

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新美, 智秀, Tomohide NIIMI, 昌記 吉田, Masaki YOSHIDA, 誠. 近藤, Makoto KONDO, 佑介 大島, et al. "PSPの低圧力域における基礎特性に関する研究." 日本機械学会, 2002. http://hdl.handle.net/2237/9016.

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Chowdhury, Sanchari. "Application of Luminescence Sensors in Oxygen Diffusion Measurement and Study of Luminescence Enhancement/Quenching by Metallic Nanoparticles." Scholar Commons, 2010. https://scholarcommons.usf.edu/etd/1599.

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The first part of this dissertation deals with the application of a luminescence quenching method to measure diffusion and permeation coefficients of oxygen in polymers. Most luminescence oxygen sensors do not follow linearity of the Stern-Volmer (SV) equation due to heterogeneity of luminophore in the polymer matrix, thus the complexity of data analysis is increased. To circumvent this limitation, inverted fluorescence microscopy is utilized in this work to investigate the SV response of the sensors at the micron-scale. In these diffusion experiments, oxygen concentration is measured by luminescence changes in regions with high SV constants and good linearity. Thus, we avoid numerical complexity of combining nonlinear SV equation with a diffusion model. This technique allows us to measure oxygen diffusion properties in different type of polymers like transparent, opaque, free-standing polymers and polymers that cannot be cast into free standing films and polymer composites. In the second part of this thesis, we have explored the effect of Ag-Cu alloy nanoparticles on the emission intensity of luminophores at their close proximity. Alloy nanoparticles offer additional degrees of freedom for tuning their optical properties by altering atomic composition and atomic arrangement and thus can be an attractive option for manipulating signal of a wide range of luminophores. In this work, surface plasmon resonance spectrum of Ag-Cu alloy nanoparticles deposited by sputtering was easily tuned in wide wavelength range by varying one experimental condition- annealing temperature. Large metal enhanced luminescence for different luminophores viz Alexa Fluor 594 and Alexa Fluor 488 were achieved at the vicinity of Ag-Cu nanoparticles when maximum spectral overlap between SPR spectra of Ag-Cu nanoparticles and the emission and absorption spectra of the luminophores occur. We also studied the effect of composition of Ag-Cu nanoparticles synthesized by the polyol process on the luminescence of low quantum yield dye Cy3. In the third part of this thesis, quenching effect of Cu nanoparticles on CdSe/ZnS nanocrystal quantum dots has been explored. As Cu nanoparticles have comparable dielectric properties with gold nanoparticles, they are expected to show similar quenching effects. It was found that Cu is an efficient quencher of fluorescence from CdSe/ZnS quantum dots and the quenching effect is due to resonance energy transfer from quantum dots to Cu nanoparticles.
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Yang, Shang-Min, and 楊上民. "Fluorescence quenching study of metal-organic frameworks adsorption of azo-dyes: Analysis of Stern-Volmer Plots." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/9tq669.

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碩士
中原大學
化學研究所
102
The main objective of this study is to investigate the adsorption of azo dyes (methyl red isomers and methyl orange) on metal-organic frameworks (MOFs) by measuring the variation of fluorescence intensity. Because of the adsorption of dyes by MOFs, the fluorescence intensity is decreased with increasing concentration of the dyes. The fluorescence measurement is further analyzed by using the Stern-Volmer equation. Dynamic quenching constant (KD) and the fluorescence lifetime (τ) are calculated in order to understand the dye fluorescence quenching ability of MOFs. The results revealed that the methyl red molecule, due to the steric hindrance of the carboxylate functional group at different position, has been adsorbed differently on MOFs, therefore the quenching capability is also different. In the excitation wavelength dependence study, though the fluorescence excitation using 270 nm is weaker compared with using 350 nm, we can still observe the fluorescence quenching of dye at 270 nm. Finally, Raman spectroscopy was also performed in order to verify the adsorption orientation of the dye adsorbed on MOFs. We have demonstrated that the results of Raman spectroscopy and fluorescence quenching are consistent. In addition to fluorescence spectroscopy, we have used the UV-visible spectroscopy, Raman spectroscopy, and time-correlated single photon counting system.The results &; discussion of these studies are included in this thesis.
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Conference papers on the topic "Stern-Volmer Plot"

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Patil, Omnath, P. K. Ingalagondi, G. B. Mathapati, and S. M. Hanagodimath. "Analysis of fluorescence quenching of coumarin derivative dye using Stern-Volmer plots." In ADVANCES IN BASIC SCIENCE (ICABS 2019). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5122630.

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