Relevant bibliographies by topics / Equation stern volmer

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Academic literature on the topic 'Equation stern volmer'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Equation stern volmer"

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Yekta, Ahmad, Zahra Masoumi, and Mitchell A. Winnik. "Luminescence measurements of oxygen permeation and oxygen diffusion in thin polymer films." Canadian Journal of Chemistry 73, no. 11 (November 1, 1995): 2021–29. http://dx.doi.org/10.1139/v95-250.

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A new method is developed for analyzing the diffusion of oxygen in thin polymer films via fluorescence quenching measurements. We begin by reviewing previous methods, all of which involve approximations, for the measurement of permeability and diffusion coefficient by luminescence quenching; their shortcomings are clarified. An exact analytic theory is developed that successfully couples Fick's laws of diffusion to the Stern–Volmer equation of intensity quenching. Various modes of experimentation with polymeric films are considered. The equations we derive make the unexpected prediction that the rate of emission intensity decay when O2 diffuses into a polymer film is much faster than the rate of emission intensity enhancement when O2 diffuses out of the same film, even when the molecular diffusivity remains unchanged. Experiments show that this is indeed the observed behaviour. Keywords: diffusion coefficient, oxygen permeability, polymers, quenching, luminescence quenching, Fick's laws. Stern–Volmer equation.
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Htun, Than. "A Negative Deviation from Stern–Volmer Equation in Fluorescence Quenching." Journal of Fluorescence 14, no. 2 (March 2004): 217–22. http://dx.doi.org/10.1023/b:jofl.0000016294.96775.fd.

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Qu, Binhong, Zhiyuan Mu, Yang Liu, Yingsha Liu, Rui Yan, Jianhui Sun, Zishu Zhang, Peng Li, and Liqiang Jing. "The synthesis of porous ultrathin graphitic carbon nitride for the ultrasensitive fluorescence detection of 2,4,6-trinitrophenol in environmental water." Environmental Science: Nano 7, no. 1 (2020): 262–71. http://dx.doi.org/10.1039/c9en01165j.

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The porous ultrathin g-C3N4 nanosheets with strong adsorption capacity have been synthesized for the ultrasensitive fluorescence detection of 2,4,6-trinitrophenol in water by the frequently neglected double-logarithmic Stern–Volmer equation.
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Ogunsipe, Abimbola, and Tebello Nyokong. "Effects of central metal on the photophysical and photochemical properties of non-transition metal sulfophthalocyanine." Journal of Porphyrins and Phthalocyanines 09, no. 02 (February 2005): 121–29. http://dx.doi.org/10.1142/s1088424605000186.

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The photophysical and photochemical properties and quenching (by 1,4-benzoquinone) of metallophthalocyanine sulfonates of aluminium ( AlPcSmix), zinc ( ZnPcSmix), silicon ( SiPcSmix), germanium ( GePcSmix) and tin ( SnPcSmix) are presented. The quantum yield values of fluorescence (ΦF), triplet state (ΦT), singlet oxygen (ΦΔ) and photodegradation (Φd) were determined and the observed trends in their variation among the complexes discussed in terms of aggregation and the heavy atom effect. 1,4-benzoquinone effectively quenched the fluorescence of the complexes. Quenching analyses gave positive deviations from Stern-Volmer behavior, suggesting the existence of static quenching in addition to dynamic quenching. The static and dynamic components of the quenching were separated using a modified Stern-Volmer equation and the “sphere of action quenching model”. The quenching constant was found to be a function of the radius of the central metal ion.
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Chen, Jingrun, Jason D. A. Lin, and Thuc-Quyen Nguyen. "Towards a Unified Macroscopic Description of Exciton Diffusion in Organic Semiconductors." Communications in Computational Physics 20, no. 3 (August 31, 2016): 754–72. http://dx.doi.org/10.4208/cicp.050615.010216a.

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AbstractWe study the exciton diffusion in organic semiconductors from a macroscopic viewpoint. In a unified way, we conduct the equivalence analysis between Monte-Carlo method and diffusion equation model for photoluminescence quenching and photocurrent spectrum measurements, in both the presence and the absence of Förster energy transfer effect. Connections of these two models to Stern-Volmer method and exciton-exciton annihilation method are also specified for the photoluminescence quenching measurement.
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Wiczk, Wiesław M., and Tadeusz Latowski. "Photophysical and Photochemical Studies of Polycyclic Aromatic Hydrocarbons in Solutions Containing Tetrachloromethane II. The Solvent Effect on the Fluorescence Quenching of Aromatic Hydrocarbons by Tetrachloromethane." Zeitschrift für Naturforschung A 42, no. 11 (November 1, 1987): 1290–95. http://dx.doi.org/10.1515/zna-1987-1111.

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Fluorescence quenching of aromatic hydrocarbons in a large concentration range of the quencher has been studied in a variety of two-component mixtures of tetrachloromethane with other solvents. In aliphatic solvents the process could be described by the Stern-Volmer equation, whereas in the remaining mixtures the fluorescence quenching curves showed a parabolic behaviour which has been explained in terms of specific interactions between the components of the mixtures.
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Amézqueta, Susana, Anna Bolioli Maria Bolioli, José Luis Beltrán, and Clara Ràfols. "Evaluation of the interactions between human serum albumin (HSA) and warfarin or diflunisal by using molecular fluorescence using two approaches." ADMET and DMPK 6, no. 1 (March 25, 2018): 47. http://dx.doi.org/10.5599/admet.6.1.473.

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<p class="PaperH1">Serum albumin is the main drug transporter of the bloodstream and contains two main binding sites: Sudlow I or acidic drug binding site, and Sudlow II or benzodiazepine binding site. Warfarin, a well-known anticoagulant drug commonly used in the prevention of thrombosis and thromboembolism, binds to Sudlow I site, whereas non-steroidal antiinflammatory drugs (NSAIDs) such as diflunisal bind preferentially to Sudlow II site. Albumin is a fluorophore that modifies its fluorescence (quenching or enhancement effect) when it is bound to a drug. The application of the double logarithm Stern-Volmer equation allows the calculation of the stoichiometry and the binding constant of the process. This procedure does not consider the possible interferences coming from the fluorescence of the drug though. Another strategy to evaluate the binding constants is to consider the whole spectrum, taking into account all the possible species in equilibrium; in this case we have used an extended version of the STAR program, which can deal with 300 spectra, each containing up to 300 data points. The aim of this work is to compare both approaches to evaluate the interaction between warfarin (Sudlow I) and diflunisal (Sudlow II) and HSA: the double logarithm Stern-Volmer equation and the STAR program.</p>
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Wang, Junsheng, Yongxin Song, Sun Jinyang, Xudong Wu, Yeqing Sun, Xinxiang Pan, and Dongqing Li. "Miniature fluorescent sensor for chloride ion concentration determination based on modified Stern–Volmer Equation." Measurement 46, no. 10 (December 2013): 3982–87. http://dx.doi.org/10.1016/j.measurement.2013.07.020.

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9

Friedl, Felix, Nils Krah, and Bernd Jähne. "Optical sensing of oxygen using a modified Stern–Volmer equation for high laser irradiance." Sensors and Actuators B: Chemical 206 (January 2015): 336–42. http://dx.doi.org/10.1016/j.snb.2014.09.073.

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Manjushree, M., and Hosakere D. Revanasiddappa. "A Diversified Spectrometric and Molecular Docking Technique to Biophysical Study of Interaction between Bovine Serum Albumin and Sodium Salt of Risedronic Acid, a Bisphosphonate for Skeletal Disorders." Bioinorganic Chemistry and Applications 2018 (June 28, 2018): 1–13. http://dx.doi.org/10.1155/2018/6954951.

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The binding interaction between bovine serum albumin (BSA) and sodium salt of risedronic acid (RSN) was studied by using the FT-IR (Fourier transform infrared), UV-Vis (ultraviolet–visible), fluorescence (emission and synchronous), CD (circular dichroism) spectrometric, and computational (molecular docking) techniques at 289, 297, and 305 K temperatures with physiological buffer of pH 7.40. The conformational and secondary structural changes observed for BSA from CD spectra and by curve fitting procedure were applied to Fourier self-deconvolution in FT-IR spectra. The formation of a BSA-RSN complex was confirmed from UV-Vis spectroscopy. The static type of quenching shown for RSN to BSA was verified from Stern–Volmer and modified Stern–Volmer equations. The binding constant of order 105 was obtained to be confirming that there exists a strong binding interaction between BSA and RSN. Synchronous fluorescence shows that the microenvironment of tryptophan was altered, not tyrosine of BSA; in addition to this, the distance between tryptophan of BSA and RSN was found out from Forster’s theory of nonradiation energy transfer. The interaction between BSA and RSN mainly occurred as a result of hydrogen bonds and van der Waals forces, the process is exothermic and spontaneous, and it was achieved through van ’t Hoff equation. This interaction was affected by the presence of biologically active Fe2+, Ni2+, Ca2+, Mg2+, and Cd2+ ions and was also studied. The subdomain IIIA of BSA involved with RSN interaction was authenticated from molecular docking analysis.
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Dissertations / Theses on the topic "Equation stern volmer"

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Guelfucci, Jean-Pierre. "Contribution a l'etude des mecanismes de photoionisation et de photoconduction dans les dielectriques liquides non polaires." Toulouse 3, 1986. http://www.theses.fr/1986TOU30029.

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Mesure du niveau de conduction d'alcanes et de cycloalcanes par difference de travaux de sortie metal/liquide, metal/vide de photocathodes en zinc ou en or irradiees par photons uv. Mise en evidence du role des etats de surface. Determination du seuil d'ionisation par photoionisation de liquides avec des photons de 7 a 10 ev. Comparaison des courbes a la theorie d'onsager. Etude de la nature des etats precurseurs a la paire separee ion-electron
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Bourque, Alex N. "Photophysical Investigations of Thiophene Azomethine Derivatives." Thèse, 2009. http://hdl.handle.net/1866/3565.

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Une série de dimères composés de thiophène-aniline encombrée stériquement a été synthétisée. Les différents processus de désactivation de l’état singulet excité ont été étudiés par UV-visible, fluorescence, phosphorescence, photolyse par impulsion laser et calculs théoriques. Les graphiques de Stern-Volmer obtenus à partir des expériences de désactivation des états singulet et triplet ont démontré l’efficacité de l’azométhine à désactiver les fluorophores. Les calculs semi-empiriques AM1 examinant l’effet des substituants encombrés ont démontrés que les groupements tert-butyls sur l’aniline ont moins d’influence sur la barrière de rotation N-aryl que les substitutions alkyles en ont sur la rotation de thiophène-C. Les calculs Rehm-Weller basés sur les potentiels d’oxydation et de réduction ont montré que l’autodésactivation de l’état excité des azométhines se fait par transfert d’électron photoinduit menant à une éradication complète de la fluorescence. Des complexes métalliques contenant des ligands azométhines ont aussi été préparés. Le ligand est composé d’une unité hydroxyquinoline lié à un cycle thiophène. Les données photophysiques de ces complexes indiquent un déplacement bathochromique aussi bien en absorbance qu’en fluorescence. Des dispositifs de détection d’ion métallique ont été préparés et un exemple à partir d’une solution de cuivre a montré un déplacement bathochromique.
A series of sterically hindered thiophene-aniline azomethine dyads were prepared. The decay pathways that deactivate the singlet excited state were studied using UV-vis fluorescence and phosphorescence, laser flash photolysis and quantum calculations. Stern-Volmer relationships, derived from singlet and triplet state quenching experiments, showed that azomethines efficiently deactivate the singlet and triplet excited states of fluorophores with bimolecular kinetics. AM1 Semi-empirical quantum calculations examining the effect of bulky substituents on the bond rotational barriers demonstrate that bulky tert-butyl groups attached to the aniline moiety have less influence on the N-aryl bond rotation barrier than alkyl substitutions do on the thiophene-CH bond rotation barrier. Rehm-Weller calculations based on electrochemical potentials demonstrate that azomethines self-quench their excited states via fast and efficient intramolecular photoinduced electron transfer leading to complete fluorescence suppression. Metal complexes containing an azomethine ligand were also prepared. The ligand contains a hydroxyquinoline moiety linked with a thiophene ring. Photophysical investigations of the resulting metal complexes demonstrated significant bathochromic shifts in the absorbance and fluorescence spectra. Metal-ion sensing devices for water solutions were prepared by spin casting the ligand onto glass slides. The metal-ion sensor detected copper in water solutions through a bathochromic shift in the absorbance maximum.
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Chen, Jyun-Kai, and 陳雋暟. "Investigation of the fluorescence quenching behavior of metal-organic frameworks using non-linear Stern–Volmer equations." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/14850363666008527447.

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碩士
中原大學
化學研究所
105
In this study, fluorescence spectroscopy was used to investigate fluorescence quenching between metal–organic frameworks (MOFs) consisting of Al centers and methyl red isomers (ortho, para, and meta). After the methyl red dyes had been adsorbed onto the metal-organic frameworks, the intensity of their fluorescence decreased as the concentration of the dye increased. The effects of the molecular structure on the fluorescence quenching were investigated using the same MOF with different methyl red dyes, or the same methyl red dye with different MOFs. When methyl red isomers were used as fluorescence quenchers, non-linear trends were observed in the CYCU-4(Al) DUT-4(Al), MIL-69(Al), and MIL-100(Al) Stern-Volmer plots. The reason for this is related to the structural properties of the MOFs and methyl red, e.g. variations in MOF ligand and differences in the substituent positions of the methyl red isomers. In addition, the non-linear curves of the Stern-Volmer plots indicated that dynamic and static fluorescence quenching between methyl red and the MOFs occurred simultaneously. Finally, to improve our understanding of the quenching behaviors of MOFs and methyl red, the temperature effect was used to differentiate the dynamic and static quenching behaviors. If the slope of the Stern-Volmer plots increased as the temperature increased, the quenching behavior was dominated by dynamic quenching. Conversely, if the slope decreased as temperature increased, then the quenching behavior was dominated by static quenching. The results will be discussed in detail in this paper.
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Conference papers on the topic "Equation stern volmer"

1

Shigunov, Vladimir, Ould el Moctar, Thomas E. Schellin, Jan Kaufmann, and Rasmus Stute. "Assessing the Dynamic Stability of an Offshore Supply Vessel." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49043.

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The dynamic stability was investigated of a typical offshore service vessel operating under stability critical operating conditions. Excessive roll motions and relative motions at the stern were studied for two loading conditions for ship speeds ranging from zero to the design speed. A linear frequency-domain seakeeping analysis was followed by nonlinear time-domain simulations of ship motions in waves. Based on results from these methods, critical scenarios were selected and simulated using finite-volume solvers of the Reynolds-averaged Navier-Stokes equations to understand the phenomena related to dynamically unstable ship motions as well as to confirm the results of the simpler analysis methods. Results revealed the possibility of excessive roll motions and water run-up on deck; counter measures such as a ship-specific operational guidance are discussed.
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2

Clauss, Gu¨nther F., and Andre´ Kauffeldt. "Investigation and Optimisation of Boat Deployment Systems at High Seas." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92246.

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There is a multitude of seagoing missions such as rescue missions, coast guard and pilot duties, whose success depend on ship-deployed boats. Launching these boats from a mother ship or recovering them by special deployment systems in a broad range of environmental conditions are key operations for a successive mission. In recent years, new boat deployment systems, promising better operational availability at high sea states, have evolved beyond the traditional side-davit system with dual falls. These new systems deploy their boats via stern ramps integrated into the transom of the mother ship, for example seen at numerous rescue cruisers around the world. This paper presents two different boat deployment systems. After a short discussion of the disadvantages of side-davit systems, a new type of a stern boat deployment device, the so called Janssen Docking System [1], is introduced. This system is equipped with an articulated ramp hinged to the stern. Whereas launching operations are less critical, the recovery of boats is quite hazardous. For this operation mode structural forces on critical areas as well as the relative motions between the ramp and the small boat are systematically investigated in model tests. Based on the results of these sea keeping tests the feasibility of the system has been analysed and improvements are recommended. As a second system a floodable dock integrated into a mother ship is presented. For launching and recovering small boats at high seas the swell inside the dock and the resulting relative motions between boat and dock ship are investigated. This leads to critical flow conditions inside the harbour in terms of sloshing waves with heights up to 3 meters. The analysis of local flow phenomena inside the dock dependent on the motion of the ship in a given sea state are the basis for the development of an optimized dock shape. Therefore an existing nonlinear numerical method for unsteady viscous computation based on Volume of Fluid (VOF) methods and Reynolds Averaged Navier Stokes Equations (RANSE) is used to simulate these phenomena. The time domain calculation allows to change local dock shapes systematically for further improvements. To validate the numerical solution the calculated results are compared to sea keeping tests at model scale. The paper concludes with a perspective for the further development of the dock shape.
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