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Bibliografie tematiche / Potentiometry

Letteratura scientifica selezionata sul tema "Potentiometry"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 11 marzo 2023

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Articoli di riviste sul tema "Potentiometry"

1

Braun, R. D. "Potentiometry and potentiometric titrations". TrAC Trends in Analytical Chemistry 4, n. 5 (maggio 1985): xxi. http://dx.doi.org/10.1016/0165-9936(85)87014-x.

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2

Zimmermann, Peter, Andreas Weltin, Gerald Urban e Jochen Kieninger. "Active Potentiometry for Dissolved Oxygen Monitoring with Platinum Electrodes". Sensors 18, n. 8 (24 luglio 2018): 2404. http://dx.doi.org/10.3390/s18082404.

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Potentiometric oxygen monitoring using platinum as the electrode material was enabled by the combination of conventional potentiometry with active prepolarization protocols, what we call active potentiometry. The obtained logarithmic transfer function is well-suited for the measurement of dissolved oxygen in biomedical applications, as the physiological oxygen concentration typically varies over several decades. We describe the application of active potentiometry in phosphate buffered salt solution at different pH and ion strength. Sensitivity was in the range of 60 mV/dec oxygen concentration; the transfer function deviated from logarithmic behavior for smaller oxygen concentration and higher ion strength of the electrolyte. Long-term stability was demonstrated for 60 h. Based on these measurement results and additional cyclic voltammetry investigations a model is discussed to explain the potential forming mechanism. The described method of active potentiometry is applicable to many different potentiometric sensors possibly enhancing sensitivity or selectivity for a specific parameter.

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3

Nagels, L. J. "Potentiometric detection for high-performance liquid chromatography is a reality: Which classes of organic substances are the targets?" Pure and Applied Chemistry 76, n. 4 (1 gennaio 2004): 839–45. http://dx.doi.org/10.1351/pac200476040839.

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Potentiometric detection in high-performance liquid chromatography (HPLC) is shown to be an underexploited technique. The technique can be of great use to less classical potentiometry targets, such as bioorganics, of low as well as of high molecular weight. The understanding of non-faradaic potentiometry is, however, still problematic. Predicting the selectivity and sensitivity of a potentiometric electrode for organic ionizable substances can be done to a certain extent using QSAR methods. Although many new polymer materials and synthetic receptor molecules for organic ionics are being synthesized, few of them are applied in potentiometric membrane coatings. Hydrophilic organics form an interesting target group for these new materials.

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4

Sheet, Partha Sarathi, Suji Park, Pavel Sengupta e Dipankar Koley. "Multifunctional dendritic molecular probe for selective detection of Cu²⁺ ions using potentiometric and fluorometric techniques". Analyst 146, n. 23 (2021): 7109–17. http://dx.doi.org/10.1039/d1an01417j.

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We have designed and synthesized a multifunctional dendritic molecular probe that selectively detects Cu2+ ions via potentiometric and fluorometric techniques with low detection limits (3.5 μM in potentiometry, 15 nM in fluorometry).

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5

Janata, Jiří. "Potentiometry in gas phase". Collection of Czechoslovak Chemical Communications 74, n. 11-12 (2009): 1623–34. http://dx.doi.org/10.1135/cccc2009101.

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In order to yield analytically useful information every potentiometric measurement requires stable and reproducible reference potential. That requirement has to be satisfied for potentiometry performed in liquid or gas phase alike, although two fundamentally different mechanisms lead to formation of the measurable cell voltage. It is shown that the Fermi level of silicon used in insulated gate field-effect transistors (IGFET) provides an exceptionally stable and robust reference potential. A semi-quantitative dependence of IGFET output on partial pressure of the analyte gas is presented.

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6

Pleniceany, Maria, Marian Isvoranu e Cezar Spinu. "Liquid membrane ion-selective electrodes for potentiometric dosage of coper and nickel". Journal of the Serbian Chemical Society 70, n. 2 (2005): 269–76. http://dx.doi.org/10.2298/jsc0502269p.

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This paper presents experimental and theoretical data regarding the preparation and characterization of three liquid-membrane electrodes, which have not been mentioned in the specialized literature so far. The active substances, the solutions of which in nitrobenzene formed the membranes on a graphite rod, are simple complex combinations of Cu(II) and Ni(II) ions with an organic ligand belonging to the Schiff base class: N-[2-thienylmethilidene]-2-aminoethanol (TNAHE). The Cu2+ -selective and Ni2+ -selective electrodes were used to determine the copper and nickel ions in aqueous solutions, both by direct potentiometry and by potentiometric titration with EDTA. They were also used for the determination of Cu2+ and Ni2+ ions in industrial waters by direct potentiometry.

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7

Kay, C. J., M. J. Barber, B. A. Notton e L. P. Solomonson. "Oxidation–reduction midpoint potentials of the flavin, haem and Mo-pterin centres in spinach (Spinacia oleracea L.) nitrate reductase". Biochemical Journal 263, n. 1 (1 ottobre 1989): 285–87. http://dx.doi.org/10.1042/bj2630285.

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Oxidation-reduction midpoint potentials have been determined for the flavin, cytochrome b557 and Mo-pterin prosthetic groups of spinach (Spinacia oleracea L.) assimilatory nitrate reductase using visible, c.d. and room-temperature e.p.r. potentiometric titrations. At pH 7 and 25 degrees C, the midpoint potential for the FAD/FADH2 couple was determined by c.d. potentiometry to be -280 +/- 10 mV (n = 2). The redox potential for reduction of the haem was determined by visible potentiometry to be -123 +/- 10 mV (n = 1), significantly lower than the previously published value of -60 mV [Fido, Hewitt, Notton, Jones & Nasrulhaq-Boyce (1979) FEBS Lett. 99, 180-182]. Potentials for the Mo(VI)/Mo(V) and Mo(V)/Mo(IV) redox couples, determined by room-temperature e.p.r. potentiometry, were found to be +2 +/- 20 and -6 +/- 20 mV respectively. These values are very similar to the values previously determined for the FAD, haem and Mo-pterin centres in assimilatory nitrate reductase isolated from the unicellular green alga Chlorella vulgaris and indicate a close thermodynamic similarity between the two enzymes.

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8

Gerasimova, Elena, Elena Gazizullina, Sofya Kolbaczkaya e Alla Ivanova. "The Novel Potentiometric Approach to Antioxidant Capacity Assay Based on the Reaction with Stable Radical 2,2′-diphenyl-1-picrylhydrazyl". Antioxidants 11, n. 10 (1 ottobre 2022): 1974. http://dx.doi.org/10.3390/antiox11101974.

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For the first time, new possibilities of using the DPPH• as a signal-forming oxidant molecule with potentiometric detection are shown. The CV method confirmed the presence of a quasi-reversible potential-determining system DPPH•/DPPH-H under experimental conditions. This fact makes it possible to use DPPH• as the model of the oxidizing agent for obtaining an analytical signal by the potentiometry method. The potentiometric approach makes it possible to obtain the value of the Nernst slope and the antioxidant capacity in one experiment. It consists of an antioxidant supplement and two consecutive DPPH• supplements. In this case, the calculation of the Nernst slope is carried out by introducing the second addition of the oxidizing agent and constructing a calibration curve against the reaction background with an antioxidant. Solutions of individual antioxidants α-tocopherol, quercetin, (±)-catechin hydrate, and α-lipoic acid were studied by the developed approach. A high correlation with the results of spectrophotometric measurements is shown. At the same time, the potentiometry method is devoid of the concentration limitations of the spectrophotometric method, which was confirmed. In the study of plant materials extracts, a high correlation of antioxidant capacity, obtained by potentiometric and spectrophotometric methods, was shown only for objects whose color did not contribute to the DPPH• absorption. The versatility of the potentiometric method for studying objects of any color was shown.

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9

Hitchman, Michael L., e Frazier W. M. Nyasulu. "Potentiometric monitoring of proteins—part 6. Indirect potentiometry". Talanta 40, n. 9 (settembre 1993): 1449–59. http://dx.doi.org/10.1016/0039-9140(93)80225-g.

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10

Vytřas, Karel, Ivan Svancara e Radovan Metelka. "Carbon paste electrodes in electroanalytical chemistry". Journal of the Serbian Chemical Society 74, n. 10 (2009): 1021–33. http://dx.doi.org/10.2298/jsc0910021v.

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An overview is given dealing with the applications of carbon paste electrodes in equilibrium potentiometry as well as in electrochemical stripping analysis using both voltammetric and potentiometric modes. Various modifications of carbon pastes and carbon paste-based biosensors are also mentioned. The main emphasis in this article is directed at summarizing recent results of the authors' research group during the past few years.

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Più fonti

Tesi sul tema "Potentiometry"

1

Smith, K. "Liquid junction effects in potentiometry". Thesis, University of Newcastle Upon Tyne, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381526.

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2

Richards, Timothy James. "Internal potentiometry of polymer field effect transistors". Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613272.

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3

David, Parra Diego Noé [UNESP]. "Estudo da dopagem no óxido de manganês tipo espinélio nanoestruturado no desempenho de um sensor potenciométrico para íons lítio". Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/97769.

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Made available in DSpace on 2014-06-11T19:29:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-05-11Bitstream added on 2014-06-13T20:18:53Z : No. of bitstreams: 1 davidparra_dn_me_sjrp.pdf: 1063590 bytes, checksum: b725dfdebce47d644726e872ef4e99d1 (MD5)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
No presente trabalho estudo0se o desempenho eletroquímico de sensores a base de óxido de manganês (IV) do tipo espinélio dopado, para determinação potenciométrica de íons lítio. A matriz porosa de óxido de manganês é formada por unidades de blocos de MnO6 octaédricos que podem formar diferentes estruturas cristalinas. O óxido de manganês tipo espinélio apresenta uma estrutura tridimensional com túneis estruturais próprios e adequados para a inserção do íon lítio. Entretanto, o desempenho eletroquímico desse óxido diminui quando submetido a várias ciclagens de inserção e extração do íon lítio na estrutura do óxido, devido ao efeito de Jahn0Teller (distorção de rede cristalina). Para minimizar o efeito Jahn0Teller, a substituição parcial do íon manganês e do oxigênio por cátions de metais de transição e/ou de ânions, respectivamente, tem sido estudado por vários grupos de pesquisa com objetivo de melhorar o desempenho eletroquímico do óxido na construção de baterias recarregáveis. Dessa forma, foi investigado o comportamento potenciométrico de óxidos de manganês dopados e avaliada sua futura aplicabilidade na determinação do cátion lítio. A resposta potenciométrica para esse cátion é baseada no mecanismo de inserção topotática redox pode ser representada por: 2Mn(IV)O2(s) + 2Li+ (aq) + H2O(l) Li2[Mn2 (III)O4](s) + 2H+ (aq) + ½ O2(g) Os óxidos de manganês dopados estudados foram: Li1,05Ga0,02Mn1,98O3,98; Li1,05Ga0,02Mn1,98S0,02O3,98 e Li1,05Ga0,02Mn1,98F0,02O3,98. Estes óxidos mostraram0se promissores para determinação de íons lítio, pois apresentaram uma maior sensibilidade (80,16, 87,02 e 94,39 mV dec01, respectivamente) quando comparados ao óxido de manganês tipo espinélio não dopado, o qual apresentou uma sensibilidade de 78,9 mV dec01 para pH 8,3. Com relação...
The electrochemical performance of the sensors based on doped spinel0type manganese (IV) oxide for lithium ions potentiometric determination was studied in this work. The porous matrix of manganese oxide is formed by MnO6 0 octahedral structure, which may form different crystal structure. The spinel0type manganese oxide has a three0dimensional structure with own structural tunnels and suitable for the insertion of lithium ion. However, the electrochemical performance this oxide decreases when subjected to various cycles of lithium ions insertion and extraction into oxide structure, ascribed to Jahn0Teller effect (crystal lattice distortion). Thus, to minimize the Jahn0 Teller effect, the partial substitution of manganese and oxygen ions by transition metal cations and/or anions, respectively, has been studied by many research groups with the objective of improving the electrochemical performance of oxide in the construction of rechargeable batteries. Accordingly, the potentiometric behavior of the doped manganese oxide and your application in the lithium cation determination were investigated and evaluated. The potentiometric response for lithium cation was based on topotactic insertion mechanism: 2Mn(IV)O2(s) + 2Li+ (aq) + H2O(l) ↔ Li[Mn2 (III)O4](s) + 2H+ (aq) + ½ O2(g) The doped manganese oxide studied were: Li1,05Mn1,98Ga0,02O3,98; Li1,05Mn1,98Ga0,02S0,02O3,98 e Li1,05Mn1,98Ga0,02F0,02O3,98.. This oxides showed promising application, because presented great sensibility (80.16; 87.02 and 94.39 mV/dec, respectively) when compared to undoped spinel0type manganese oxide, before studied by Teixeira and coauthor, which presented a sensibility of 78.9 mV/dec for pH 8.3. In relation to linear range of response, the result were satisfactory for doped oxide (5.96 x 1005 to 1.62 x1003, 3.49 x 1005 to... (Complete abstract click electronic access below)

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4

Danish, Ekram Yousif. "Determination of ionized magnesium with ion-selective electrodes". Thesis, University of Newcastle Upon Tyne, 1996. http://hdl.handle.net/10443/833.

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The role of magnesium is acknowledged in human physiology even though it is incompletely understood,a nd measuremenot f ionized magnesium by ion-selective electrode analysers is becoming commoner as recent research has alerted clinicians to its importance. Standardisation of ionized magnesium in blood samples in the form of a reference method is required. A prototype reference cell, which was developed for the reference method for ionized calcium, has been tested and found to perform well for magnesium. Selectivity coefficients, and the effects of pH and of proteins on various magnesium selective membranes have been determined. None of these membranes showed sufficient selectivity for magnesium over calcium and sodium for use with serum samples without simultaneous measurement of calcium. Knowledgeo f magnesiums peciationis requiredf or a full understanding of its role in physiology. Stability constants for magnesium and calcium with various ligands have been determined by using a new method in which a pH electrode and a Mg (or, Ca) electrode have been employed simultaneously in alkalimetric titrations. The' results were analysed using the program SUPERQUAD. In general, agreement was very good between values obtained from titrations with Mg (or Ca) electrodes and from pH. The protonation constants of the ligands were also determined and agree well with literaturev alues.R esultsf or Mg-citrate,l actate,g lycinate,a spartatea nd glutamatec omplexationc onstantsc omparew ell with recentlyp ublishedd ata. New systems investigated were Mg-pyroglutamate (Mg-5-oxo-2- pyrrolidinecarboxylic acid) and Mg-pyridoxine (Mg-3-hydroxy-4,5- bis(hydroxymethyl)-2-methylpyridine). Also HEPES (N-(2-hydroxyl) piperazine-N-ethanesulfoniacc id), used in calibration standardsa s a pH buffer, was found not to complex magnesium at physiological pH.

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5

Pereira, Angelo W. D. "A floating-gate delta-sigma modulator". Diss., Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04072004-180136/unrestricted/pereira%5Fangelo%5Fw%5F200312%5Fms.pdf.

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6

David, Parra Diego Noé. "Estudo da dopagem no óxido de manganês tipo espinélio nanoestruturado no desempenho de um sensor potenciométrico para íons lítio /". São José do Rio Preto : [s.n.], 2012. http://hdl.handle.net/11449/97769.

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Orientador: Marcos Fernando de Souza Teixeira
Banca: Silvio Rainho Teixeira
Banca: Éder Tadeu Gomes Cavalheiro
Resumo: No presente trabalho estudo0se o desempenho eletroquímico de sensores a base de óxido de manganês (IV) do tipo espinélio dopado, para determinação potenciométrica de íons lítio. A matriz porosa de óxido de manganês é formada por unidades de blocos de MnO6 octaédricos que podem formar diferentes estruturas cristalinas. O óxido de manganês tipo espinélio apresenta uma estrutura tridimensional com túneis estruturais próprios e adequados para a inserção do íon lítio. Entretanto, o desempenho eletroquímico desse óxido diminui quando submetido a várias ciclagens de inserção e extração do íon lítio na estrutura do óxido, devido ao efeito de Jahn0Teller (distorção de rede cristalina). Para minimizar o efeito Jahn0Teller, a substituição parcial do íon manganês e do oxigênio por cátions de metais de transição e/ou de ânions, respectivamente, tem sido estudado por vários grupos de pesquisa com objetivo de melhorar o desempenho eletroquímico do óxido na construção de baterias recarregáveis. Dessa forma, foi investigado o comportamento potenciométrico de óxidos de manganês dopados e avaliada sua futura aplicabilidade na determinação do cátion lítio. A resposta potenciométrica para esse cátion é baseada no mecanismo de inserção topotática redox pode ser representada por: 2Mn(IV)O2(s) + 2Li+ (aq) + H2O(l) Li2[Mn2 (III)O4](s) + 2H+ (aq) + ½ O2(g) Os óxidos de manganês dopados estudados foram: Li1,05Ga0,02Mn1,98O3,98; Li1,05Ga0,02Mn1,98S0,02O3,98 e Li1,05Ga0,02Mn1,98F0,02O3,98. Estes óxidos mostraram0se promissores para determinação de íons lítio, pois apresentaram uma maior sensibilidade (80,16, 87,02 e 94,39 mV dec01, respectivamente) quando comparados ao óxido de manganês tipo espinélio não dopado, o qual apresentou uma sensibilidade de 78,9 mV dec01 para pH 8,3. Com relação... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The electrochemical performance of the sensors based on doped spinel0type manganese (IV) oxide for lithium ions potentiometric determination was studied in this work. The porous matrix of manganese oxide is formed by MnO6 0 octahedral structure, which may form different crystal structure. The spinel0type manganese oxide has a three0dimensional structure with own structural tunnels and suitable for the insertion of lithium ion. However, the electrochemical performance this oxide decreases when subjected to various cycles of lithium ions insertion and extraction into oxide structure, ascribed to Jahn0Teller effect (crystal lattice distortion). Thus, to minimize the Jahn0 Teller effect, the partial substitution of manganese and oxygen ions by transition metal cations and/or anions, respectively, has been studied by many research groups with the objective of improving the electrochemical performance of oxide in the construction of rechargeable batteries. Accordingly, the potentiometric behavior of the doped manganese oxide and your application in the lithium cation determination were investigated and evaluated. The potentiometric response for lithium cation was based on topotactic insertion mechanism: 2Mn(IV)O2(s) + 2Li+ (aq) + H2O(l) ↔ Li[Mn2 (III)O4](s) + 2H+ (aq) + ½ O2(g) The doped manganese oxide studied were: Li1,05Mn1,98Ga0,02O3,98; Li1,05Mn1,98Ga0,02S0,02O3,98 e Li1,05Mn1,98Ga0,02F0,02O3,98.. This oxides showed promising application, because presented great sensibility (80.16; 87.02 and 94.39 mV/dec, respectively) when compared to undoped spinel0type manganese oxide, before studied by Teixeira and coauthor, which presented a sensibility of 78.9 mV/dec for pH 8.3. In relation to linear range of response, the result were satisfactory for doped oxide (5.96 x 1005 to 1.62 x1003, 3.49 x 1005 to... (Complete abstract click electronic access below)
Mestre

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7

O'Connell, Gregory Raymond. "Detector cell hydrodynamics and electrode selectivity in flow-injection potentiometry". Thesis, Brunel University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290935.

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8

Sabri, Shadi Saleem. "Surface potentiometry with graphene field effect transistors for sensing applications". Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121120.

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In this thesis, we establish the foundations on which graphene based chemical sensors can be developed. Graphene combines several ideal characteristics for potentiometry and charge probing at surfaces which are essential for chemical sensing applications. Hitherto, graphene/substrate interactions have masked the response of graphene based chemical sensors. We demonstrate the use of hydrophobic polymers as a substrate for graphene field effect transistors (FETs) as a means to eliminate undesired graphene/substrate interactions. Parylene gated devices exhibit stable neutrality point gate voltage under ambient conditions, higher mobilities (~10,000 cm2/V.s), and less hysteresis than that observed in graphene FETs with a typical silicon oxide gate. We show quantitatively that electrochemistry involving adsorbed water, graphene, and the substrate is responsible for p-doping in silicon oxide gated graphene FETs. We identify the water/oxygen redox couple as the underlying mechanism for this reaction and capture its kinetics.The aforementioned fundamental studies of graphene permit the development of improved graphene FET based chemical sensors in atmosphere and in solution. We demonstrate that large-area, graphene FETs with a passive parylene substrate and a polyethyleneimine (PEI) functional layer have enhanced sensitivity to CO2 gas exposure. The electron doping of graphene, caused by protonated amine groups within the PEI, is modulated by the formation of negatively charged species generated by CO2 adsorption. The charge doping mechanism is general, and quantitative doping density changes can be determined from the graphene FET characteristics. Finally, we investigate the behavior of graphene FETs in a solution. We present electrochemical techniques to probe the graphene's Fermi level position versus changes in pH. We show that bare graphene devices are not sensitive to changes in pH due to the absence of surface sites available to participate in the protonation and deprotonation process necessary for pH sensing. We finally provide a technique to increase the sensitivity of graphene FETs to changes in pH by utilizing a thin Ta2O5 layer on the graphene surface.
Dans cette thèse, nous établissons les bases selon lesquelles les senseurs chimiques à base de graphène pourront être développés. Le graphène combine plusieurs caractéristiques idéales pour la potentiométrie et la sensibilité aux charges en surface. Ces deux caractéristiques sont essentielles pour des applications de senseurs chimiques. Depuis lors, les interactions entre le graphène et le substrat ont masqués la réponse des senseurs chimiques à base de graphène. Nous démontrons l'utilité de polymères hydrophobe comme substrat pour des transistors à effet de champ (FET) à base de graphène afin d'éliminer les interactions entre le substrat et le graphène. Les dispositifs à base de parylène démontrent une stabilité du point de neutralité dans le voltage de grille, des mobilités supérieures (10000 cm2/Vs) ainsi que moins d'hystérèse que les dispositifs avec une grille à base d'oxyde de silicium. Nous démontrons quantitativement que l'électrochimie entre l'eau adsorbée, le graphène et le substrat est responsable du dopage p dans les FETs à base de graphène et d'oxyde de silicium. Nous identifions le couple redox eau/oxygène comme responsable de cette réaction et nous mesurons la cinétique de cette réaction. Les études fondamentales mentionnées ci-haut permettent le développement de senseurs chimiques à base de graphène dans des conditions ambiantes ainsi qu'en solution. Nous démontrons que des échantillons de large taille de FETs à base de graphène avec une couche de parylène passivé et une couche fonctionnelle de polyethyleninine (PEI) augmentent la sensibilité au CO2. Le dopage aux électrons du graphène, causé par la protonation des groupes aminés dans le PEI, est modulé par la formation d'espèces chargées négativement par l'absorption de CO2. Le mécanisme de dopage de charge est général et la densité du dopage peut être déterminée par les caractéristiques des FETs à base de graphène.Finalement, nous investiguons le comportement des FETs à base de graphène en solution. Nous présentons des techniques électrochimiques afin de mesurer la position du niveau de Fermi dans le graphène en fonction de changement du pH. Nous démontrons que des dispositifs sans PEI ne sont pas sensibles aux changements de pH à cause de l'absence de sites en surface capables de participer à la protonation et la dé-protonation nécessaire pour être sensible au pH. Nous présentons finalement une technique pour augmenter la sensitivité des FETs de graphène aux changements de pH en utilisant une fine couche de Ta2O5 sur la surface du graphène.

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9

Wong, Lai Chun Caleb. "A study of multichannel open circuit potentiometry in biosensor applications". Thesis, University of Bath, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761002.

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The specificity of biosensors is achieved by the use of biological probes with affinity to the targets to be detected. The electrochemical transducer converts the biological recognition process into an electrical signal. The resulting electrical signal is the response of the recognition from the biolayer. Potentiometric, amperometric and voltammetric detection are the fundamental electrochemical measurement techniques. In this thesis, direct open circuit potentiometry (OCP) is studied with several types of electrochemical systems. The biological interaction between the probes and the targets are characterised by measuring the variations of the true open circuit potential (OCP) that occurs at the surface of the working electrode when the charge density and the distribution of the immobilised biolayer change upon interactions with the target biomolecules. OCP is a detection technique which measures the recognition electrical signal in real time. With the true OCP measurement system developed in-house, a number of electrochemical systems were studied by looking at the interaction with different biomolecules, to show that a true OCP measurement system could be achieved for biosensor development. The electrochemical systems that have been investigated include DNA – DNA detection with a novel cobalt complex for signal enhancement, PNA – DNA detection with gold nanoparticles for signal enhancement, and protein phosphorylation (for drug discovery applications) with gold nanoparticles for signal enhancement. A comparison with promising biosensing techniques such as electrochemical impedance spectroscopy (EIS) and other techniques is performed to demonstrate the benefits of OCP as a biosensing technique. An easily expandable multichannel OCP biosensor array instrumentation system was developed. The whole instrumentation is built and assembled with a custom designed electronic system, a microfluidic system and its applicability demonstrated for a range of electrochemical systems. Through an investigation of the instrumentation amplifier circuit and the multiplexing technique, and the analysis of experimental data, an optimisation for the OCP measurement system is achieved. This thesis tackles a gap in the literature in terms of studies of OCP as a biosensing technique, providing a number of case studies that can contribute towards the development of potential new low-cost biosensors.

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10

FELIX, GISELE R. "Implantacao da tecnica potenciometrica para medidas in situ da solubilidade de oxidos em meio de sais fundidos .Eletrodos indicados de zirconia estabilizada". reponame:Repositório Institucional do IPEN, 1996. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10482.

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IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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Libri sul tema "Potentiometry"

1

Potentiometry and potentiometric titrations. Malabar, Fla: Krieger Pub. Co., 1991.

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2

Néher-Neumann, Erzsébet. Advanced Potentiometry. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-9525-2.

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3

1923-, James A. M., e ACOL (Project), a cura di. Potentiometry and ion selective electrodes. Chichester [West Sussex]: Published on behalf of ACOL, Thames Polytechnic, London, by Wiley, 1987.

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4

Evans, Alun. Potentiometry and ion selective electrodes. A cura di James A. M. 1923- e ACOL. Chichester: Published on behalf of ACOL by Wiley, 1987.

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5

Joseph, Robert L. Potentiometric surface of the Cockfield aquifer in southeastern Arkansas and the Wilcox aquifers in southern and northeastern Arkansas, October 1996-July 1997. Little Rock, Ark: U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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6

Michałowski, Tadeusz. Nowe koncepcje analizy stężonych roztworów elektrolitów metodą potencjometrycznego miareczkowania w układach kwasowo-zasadowych. Kraków: Nakł. Uniwersytetu Jagiellońskiego, 1989.

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7

Schrader, Tony P. Potentiometric surface of the Ozark aquifer in northern Arkansas, 2001. Little Rock, Ark: U.S. Dept. of the Interior, U.S. Geological Survey, 2001.

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8

Stanton, Gregory P. Potentiometric surface and specific conductance of the Sparta and Memphis aquifers in eastern Arkansas, 1995. Little Rock, Ark: U.S. Dept. of the Interior, U.S. Geological Survey, 1997.

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9

Pugh, Aaron L. Potentiometric surface of the Ozark aquifer in northern Arkansas, 1995. Little Rock, Ark: U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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10

Berg, Hans Joachim. Analyse und Überwachung von Gasatmosphären der thermisch-chemischen Behandlung: Untersuchungen am Beispiel des Gasnitrierens. Leipzig: Deutscher Verlag für Grundstoffindustrie, 1988.

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Capitoli di libri sul tema "Potentiometry"

1

Pomeranz, Yeshajahu, e Clifton E. Meloan. "Potentiometry". In Food Analysis, 172–87. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-6998-5_12.

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2

Kahlert, Heike. "Potentiometry". In Electroanalytical Methods, 237–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02915-8_12.

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Kahlert, Heike. "Potentiometry". In Electroanalytical Methods, 223–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/978-3-662-04757-6_12.

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4

Vonau, Winfried. "Potentiometry". In Encyclopedia of Applied Electrochemistry, 1692–97. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4419-6996-5_231.

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5

Gandhi, Kamal, Neelima Sharma, Priyae Brath Gautam, Rajan Sharma, Bimlesh Mann e Vanita Pandey. "Potentiometry". In Springer Protocols Handbooks, 147–60. New York, NY: Springer US, 2022. http://dx.doi.org/10.1007/978-1-0716-1940-7_7.

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Neumann, Erzsébet Néher. "Introduction". In Advanced Potentiometry, 1–16. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-9525-2_1.

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7

Neumann, Erzsébet Néher. "Emf Cells with Mixtures of Strong Electrolytes and Liquid Junctions of the Type AY | AY + HY + BYz(B)". In Advanced Potentiometry, 17–46. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-9525-2_2.

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8

Neumann, Erzsébet Néher. "Determination of the Ionic Molar Conductivities in Mixtures of the Strong Electrolytes HClO4 + NaClO4 + Cd(ClO4)2". In Advanced Potentiometry, 47–76. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-9525-2_3.

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Neumann, Erzsébet Néher. "Studies on Emf Cells Where Complex Formation Takes Place Using Liquid Junctions of the Type AY | AY + HY + BYz(B) + AyL and − log10 [H+] ≤ 7". In Advanced Potentiometry, 77–173. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-9525-2_4.

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10

Neumann, Erzsébet Néher. "Estimation of the Total Potential Anomalies and the Determination of the Equilibrium Constants in Emf Cells Where Every Kind of Complex Can Be Present". In Advanced Potentiometry, 175–79. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-9525-2_5.

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Atti di convegni sul tema "Potentiometry"

1

Hidaka, Yuji, Daiki Maruyama, Junichi Uchikoshi, Mizuho Morita e Kenta Arima. "Scanning Surface Hall Potentiometry on Semiconductor Wafers". In 2007 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2007. http://dx.doi.org/10.7567/ssdm.2007.f-7-3.

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Ma, Daryl, Yiyang Chen, Sara S. Ghoreishizadeh e Pantelis Georgiou. "SPACEMan: Wireless SoC for Concurrent Potentiometry and Amperometry". In 2021 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE, 2021. http://dx.doi.org/10.1109/iscas51556.2021.9401312.

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Arima, Kenta, Kenji Hiwa, Ryoji Nakaoka e Mizuho Morita. "Surface Hall Potentiometry to Characterize Functional Semiconductor Films". In 2005 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2005. http://dx.doi.org/10.7567/ssdm.2005.f-4-6.

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4

Xie, Ting, Michael Dreyer, David Bowen, Dan Hinkel, R. E. Butera, Charles Kraffit e Isaak Mayergoyz. "A simple implementation of scanning tunneling potentiometry with a standard scanning tunneling microscope". In 2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2017. http://dx.doi.org/10.1109/nano.2017.8117420.

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5

Abraham, David W., Yves Martin e Kumar Wiekramasinghe. "High-Resolution Capacitance Measurement By Force Microscopy: Application To Sample Characterization And Potentiometry". In 1988 Los Angeles Symposium--O-E/LASE '88, a cura di E. Clayton Teague. SPIE, 1988. http://dx.doi.org/10.1117/12.944546.

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Yamasue, Kohei, e Yasuo Cho. "Atomic Resolution Studies on Surface Dipoles by Noncontact Scanning Nonlinear Dielectric Microscopy and Potentiometry". In 2020 Joint Conference of the IEEE International Frequency Control Symposium and International Symposium on Applications of Ferroelectrics (IFCS-ISAF). IEEE, 2020. http://dx.doi.org/10.1109/ifcs-isaf41089.2020.9234884.

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Batalova, Valentina, Ekaterina Nabokova e Anton Reger. "Assessing antioxidant activity of tea extracts and some of chemicals using voltammetry and potentiometry". In PROSPECTS OF FUNDAMENTAL SCIENCES DEVELOPMENT (PFSD-2016): Proceedings of the XIII International Conference of Students and Young Scientists. Author(s), 2016. http://dx.doi.org/10.1063/1.4964579.

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8

Danielson, Eric, Christopher Lombardo e Ananth Dodabalapur. "Characterization of charge transport via in situ potentiometry in bulk heterojunction organic photovoltaic materials". In SPIE Organic Photonics + Electronics, a cura di Zakya H. Kafafi, Christoph J. Brabec e Paul A. Lane. SPIE, 2012. http://dx.doi.org/10.1117/12.928881.

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9

Scholz, R., A. D. Müller, F. Müller, I. Thurzo, B. A. Paez, L. Mancera, D. R. T. Zahn, C. Pannemann e U. Hilleringmann. "Comparison between the charge carrier mobilities in pentacene OFET structures as obtained from electrical characterization and potentiometry". In Optics & Photonics 2005, a cura di Zhenan Bao e David J. Gundlach. SPIE, 2005. http://dx.doi.org/10.1117/12.617004.

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Niculescu, Mihaela-Doina, Brandusa Georgiana Dumitriu, Madalina Ignat, Simona Savin, Cosmin Andrei Alexe e Gabriela Paun. "Protein Composites from Collagen By-Products for Safe Use in Circular Economy". In The 9th International Conference on Advanced Materials and Systems. INCDTP - Leather and Footwear Research Institute (ICPI), Bucharest, Romania, 2022. http://dx.doi.org/10.24264/icams-2022.iv.8.

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Abstract (sommario):

Sustainable economy means reducing the carbon footprint and minimizing the amount of waste released from productive activities. This paper presents the characterization of composites obtained from by-products of the leather industry based on collagen and keratin extracts. The protein composites have specific properties for the agricultural field and industrial applications in accordance with the current recommendations for a sustainable economy. Chemical-enzymatic hydrolysis of leather and wool by-products was performed for protein extraction. The composites were obtained by addition and crosslinking of collagen and keratin extracts with tannins from vegetable by-products. The characterization of composites was performed based on the results of analytical investigations by physico-chemical methods: volumetry, potentiometry, Texture Analysis, Dynamic Light Scattering, colorimetry, microscopy. It has been found that new collagen and keratin extracts contain small and medium components size, useful for the biostimulation of agricultural crops, but also contain large size components which give adhesive and film-forming properties, useful in industrial applications.

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Rapporti di organizzazioni sul tema "Potentiometry"

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Levon, Kalle. Potentiometric Detection of Pathogens. Fort Belvoir, VA: Defense Technical Information Center, gennaio 2012. http://dx.doi.org/10.21236/ada583695.

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Ervin, E. M., R. R. Luckey e D. J. Burkhardt. Revised potentiometric-surface map, Yucca Mountain and vicinity, Nevada. Office of Scientific and Technical Information (OSTI), dicembre 1994. http://dx.doi.org/10.2172/60920.

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Tucci, P., e D. J. Burkhardt. Potentiometric-surface map, 1993, Yucca Mountain and vicinity, Nevada. Office of Scientific and Technical Information (OSTI), dicembre 1995. http://dx.doi.org/10.2172/231907.

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4

Mesmer, R. E., D. A. Palmer e D. J. Wesolowski. Potentiometric studies at ORNL with hydrogen electrode concentration cells. Office of Scientific and Technical Information (OSTI), dicembre 1994. http://dx.doi.org/10.2172/10117964.

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Cureton, LaShonda T., George Fountzoulas e John J. La Scala. Molecular Weight Measurement of Biobased Furan Polyamides via Non-Aqueous Potentiometric Titration. Fort Belvoir, VA: Defense Technical Information Center, giugno 2013. http://dx.doi.org/10.21236/ada586113.

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Spane, F. A. Jr, e R. G. Raymond. Preliminary potentiometric map and flow dynamic characteristics for the upper-basalt confined aquifer system. Office of Scientific and Technical Information (OSTI), settembre 1993. http://dx.doi.org/10.2172/10103183.

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Engmann, J., H. W. Blanch e J. M. Prausnitz. Protein-salt binding data from potentiometric titrations of lysozyme in aqueous solutions containing KCl. Office of Scientific and Technical Information (OSTI), marzo 1997. http://dx.doi.org/10.2172/486115.

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Christensen, Earl, Jack Ferrell, Mariefel V. Olarte, Asanga B. Padmaperuma e Teresa Lemmon. Acid Number Determination of Pyrolysis Bio-oils using Potentiometric Titration: Laboratory Analytical Procedure (LAP). Office of Scientific and Technical Information (OSTI), marzo 2016. http://dx.doi.org/10.2172/1241091.

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9

Ervin, E. M., R. R. Luckey e D. J. Burkhardt. Revised potentiometric-surface map, Yucca Mountain and vicinity, Nevada; Water-resources investigations report 93-4000. Office of Scientific and Technical Information (OSTI), maggio 1994. http://dx.doi.org/10.2172/145260.

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Black, Stuart, Jack Ferrell, Mariefel V. Olarte e Asanga B. Padmaperuma. Determination of Carbonyls in Pyrolysis Bio-oils by Potentiometric Titration. Faix Method. Laboratory Analytical Procedure (LAP). Office of Scientific and Technical Information (OSTI), marzo 2016. http://dx.doi.org/10.2172/1241099.

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