Search results for: Eric Bakker

Items from 1 to 20 out of 135 results

article

Thin Layer Membrane Systems as Rapid Development Tool for Potentiometric Solid Contact Ion‐selective Electrodes

Tara Forrest, Elena Zdrachek, Eric Bakker

The use of thin membrane layer ion‐selective electrodes (of ∼200 nm thickness) as rapid diagnosis tool is proposed. While conventional solid contact systems (with a membrane of ∼250 μm thickness) may exhibit a satisfactory stability for regular laboratory use, a signal degradation can still be distinguished over a longer period of time but this requires tedious and time consuming tests. By diminishing...

article

A Solid‐State Reference Electrode Based on a Self‐Referencing Pulstrode

Wenyue Gao, Elena Zdrachek, Xiaojiang Xie, Eric Bakker

Angewandte Chemie International Edition > 59 > 6 > 2294 - 2298

The design of solid‐state reference electrodes without a liquid junction is important to allow miniature and cost‐effective electrochemical sensors. To address this, a pulse control is proposed using an Ag/AgI element as reliable solid‐state reference electrode. It involves the local release of iodide by a cathodic current that is immediately followed by an electromotive force (EMF) measurement that...

article

A Solid‐State Reference Electrode Based on a Self‐Referencing Pulstrode

Wenyue Gao, Elena Zdrachek, Xiaojiang Xie, Eric Bakker

Angewandte Chemie > 132 > 6 > 2314 - 2318

article

Light‐Addressable Ion Sensing for Real‐Time Monitoring of Extracellular Potassium

Ying Yang, Maria Cuartero, Vinicius Romero Gonçales, J. Justin Gooding, more

Angewandte Chemie International Edition > 57 > 51 > 16801 - 16805

We report here on a light addressable potassium (K⁺) sensor where light illumination of a semiconducting silicon electrode substrate results in a localized activation of the faradaic electrochemistry at the illuminated spot. This allows one, by electrochemical control, to oxidize surface bound ferrocene moieties that in turn trigger K⁺ transfer from the overlaid K⁺‐selective film to the solution phase...

article

Light‐Addressable Ion Sensing for Real‐Time Monitoring of Extracellular Potassium

Ying Yang, Maria Cuartero, Vinicius Romero Gonçales, J. Justin Gooding, more

Angewandte Chemie > 130 > 51 > 17043 - 17047

article

Ion‐exchange Microemulsions for Eliminating Dilute Interferences in Potentiometric Determinations

Sutasinee Apichai, Lu Wang, Nadezda Pankratova, Kate Grudpan, more

Electroanalysis > 30 > 10 > 2462 - 2466

We report here for the first time on the use of functional microemulsions in potentiometric assays to remove dilute interferences from solution when measuring high concentrations of analyte. The microemulsions are similarly formulated to the ion‐selective membrane used in the measurement and act as sacrificial material. They are here stabilized by the triblock copolymer pluronic F‐127 and contain...

article

Ion Transfer Voltammetry in Polyurethane Thin Films Based on Functionalised Cationic [6]Helicenes for Carbonate Detection

Zdeňka Jarolímová, Johann Bosson, Geraldine M. Labrador, Jérôme Lacour, more

Electroanalysis > 30 > 7 > 1378 - 1385

We explore here molecular ion‐to‐electron redox probes based on cationic diaza, azaoxa, and dioxa [6]helicenes and their derivatives as ion‐to‐electron transducers for the electrochemical detection of anions. These cationic [6]helicenes exhibit reversible and reproducible oxidation/reduction behavior and facilitate the anion transfer of Gaussian shape into polymeric thin layer sensing films. Films...

article

Assessment of cam morphology of the hip with ultra sound imaging by physical therapists is reliable and valid

Liliane Mandema, Igor Tak, Brigitte Mooij, Ruud Groeneweg, more

Physical Therapy in Sport > 2018 > 32 > C > 167-172

Femoroacetabular impingement syndrome is considered present when a combination of clinical symptoms, signs and morphological features of the hip co-exist. Imaging is increasingly popular in primary health care settings with physical therapists performing ultrasound (US).The aim of this study was to assess the diagnostic accuracy and inter-rater reliability of ultrasound in determining presence of...

article

Surface‐Doped Polystyrene Microsensors Containing Lipophilic Solvatochromic Dye Transducers

Lu Wang, Xiaojiang Xie, Tianchi Cao, Jérôme Bosset, more

Chemistry – A European Journal > 24 > 31 > 7921 - 7925

Ion‐selective optical microsensors based on surface‐modified polystyrene (PS) beads with positively charged lipophilic solvatochromic dye (SD) on the surface were studied with K⁺ as model ion. Water‐soluble SDs are expelled into the aqueous phase by ion exchange with the cationic analyte of interest, resulting in a detectable color change. In contrast, lipophilic SDs are more attractive, as they appear...

article

Electron Hopping between Fe 3 d States in Ethynylferrocene‐doped Poly(Methyl Methacrylate)‐poly(Decyl Methacrylate) Copolymer Membranes

Maria Cuartero, Robert G. Acres, Zdenka Jarolímová, Eric Bakker, more

Electroanalysis > 30 > 4 > 596 - 601

Synchrotron radiation‐valence band spectroscopy (SR‐VBS) has been utilized in a study of redox molecule valence states implicated in the electron hopping mechanism of ethynylferrocene in unplasticized poly(methyl methacrylate)‐poly(decyl methacrylate) [PMMA‐PDMA] membranes. In this communication, it is revealed that, at high concentrations of ethynylferrocene, there are observable Fe 3d valence states...

article

Ion Transfer Voltammetry at Thin Films Based on Functionalized Cationic [6]Helicenes

Zdeňka Jarolímová, Johann Bosson, Geraldine M. Labrador, Jérôme Lacour, more

Electroanalysis > 30 > 4 > 650 - 657

We describe a new family of molecular ion‐to‐electron redox probes based on cationic diaza, azaoxa, and dioxa [6]helicenes and their derivatives. Their unique structure combines, in a single framework, two privileged families of molecules – helicenes and triaryl methyl carbenium moieties. These cationic [6]helicenes exhibit reversible and reproducible oxidation/reduction behavior and facilitate the...

article

Cover Picture: Electron Hopping between Fe 3 d States in Ethynylferrocene‐doped Poly(Methyl Methacrylate)‐poly(Decyl Methacrylate) Copolymer Membranes (Electroanalysis 4/2018)

Maria Cuartero, Robert G. Acres, Zdenka Jarolímová, Eric Bakker, more

Electroanalysis > 30 > 4 > 593 - 593

The cover picture shows a probing of the valence band structure and the concomitant electron hopping mechanism of a ferrocene loaded polymer membrane by synchrotron radiation valence band spectroscopy. DOI: 10.1002/elan.201700510.

article

Describing Ion Exchange at Membrane Electrodes for Ions of Different Charge

Elena Zdrachek, Eric Bakker

Electroanalysis > 30 > 4 > 633 - 640

It is well‐documented in the literature that the Nikolsky‐Eisenman equation cannot accurately describe the equilibrium of ion exchange at membrane electrodes for ions of different charge. Despite this, unfortunately, it is still widely used owing to the complexity of the more rigorous formalism developed by Bakker et al. in 1994. Here, different available approaches are presented in a unified manner...

article

Fluorinated tripodal receptors for potentiometric chloride detection in biological fluids

Nadezda Pankratova, Maria Cuartero, Laura A. Jowett, Ethan N.W. Howe, more

Biosensors and Bioelectronics > 2018 > 99 > C > 70-76

Fluorinated tripodal compounds were recently reported to be efficient transmembrane transporters for a series of inorganic anions. In particular, this class of receptors has been shown to be suitable for the effective complexation of chloride, nitrate, bicarbonate and sulfate anions via hydrogen bonding. The potentiometric properties of urea and thiourea-based fluorinated tripodal receptors are explored...

article

Agarose hydrogel containing immobilized pH buffer microemulsion without increasing permselectivity

Miguel Coll Crespi, Gaston A. Crespo, Xiaojiang Xie, Romain Touilloux, more

Talanta > 2018 > 177 > C > 191-196

A heterogeneous pH buffer based on a colloidal emulsion containing ion-exchanger and lipophilic base is described that can be integrated into hydrogels without affecting their ion-exchange properties. Each sphere works on the basis of reversible ion-exchange of hydrogen ions with solution cations, acting as a pH buffer while staying removed from solution in the nonpolar core of the spheres. The ion-exchange...

article

Electrochemical Mechanism of Ferrocene-Based Redox Molecules in Thin Film Membrane Electrodes

Maria Cuartero, Robert G. Acres, John Bradley, Zdenka Jarolimova, more

Electrochimica Acta > 2017 > 238 > C > 357-367

Cyclic voltammetry (CV) in chloride-based aqueous electrolytes of ferrocene molecule doped thin membranes (∼200nm in thickness) on glassy carbon (GC) substrate electrodes, both plasticized poly(vinyl chloride) (PVC) and unplasticized poly(methyl methacrylate)/poly(decyl methacrylate) (PMMA-PDMA) membranes, has shown that the electrochemical oxidation behavior is irreversible due most likely to degradation...

article

Phenytoin speciation with potentiometric and chronopotentiometric ion-selective membrane electrodes

Sutida Jansod, Majid Ghahraman Afshar, Gastón A. Crespo, Eric Bakker

Biosensors and Bioelectronics > 2016 > 79 > C > 114-120

We report on an electrochemical protocol based on perm-selective membranes to provide valuable information about the speciation of ionizable drugs, with phenytoin as a model example. Membranes containing varying amounts of tetradodecylammonium chloride (TDDA) were read out at zero current (potentiometry) and with applied current techniques (chronopotentiometry). Potentiometry allows one to assess...

article

Characterization of Salophen Co(III) Acetate Ionophore for Nitrite Recognition

Gastón A. Crespo, Majid Ghahraman Afshar, Noelia Barrabés, Marcin Pawlak, more

Electrochimica Acta > 2015 > 179 > C > 16-23

The ionophore (salph)Co(III)OAc is used here for the first time as a recognition molecule for nitrite in lipophilic membranes. The nature of the recognition process is evaluated by UV-Vis, ATR-IR and potentiometry, while the purity of the compound is confirmed by LC-MS and cyclic voltammetry. Experimental evidence suggests a replacement of the acetate ligand by nitrite. The formation constant between...

article

Thin‐Layer Chemical Modulations by a Combined Selective Proton Pump and pH Probe for Direct Alkalinity Detection

Majid Ghahraman Afshar, Gastón A. Crespo, Eric Bakker

Angewandte Chemie > 127 > 28 > 8228 - 8231

We report a general concept based on a selective electrochemical ion pump used for creating concentration perturbations in thin layer samples (∼40 μL). As a first example, hydrogen ions are released from a selective polymeric membrane (proton pump) and the resulting pH is assessed potentiometrically with a second membrane placed directly opposite. By applying a constant potential modulation for 30...

article

Thin‐Layer Chemical Modulations by a Combined Selective Proton Pump and pH Probe for Direct Alkalinity Detection

Majid Ghahraman Afshar, Gastón A. Crespo, Eric Bakker

Angewandte Chemie International Edition > 54 > 28 > 8110 - 8113

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ION-SELECTIVE ELECTRODES (12)
POTENTIOMETRY (12)
ION-SELECTIVE ELECTRODE (8)
CHRONOPOTENTIOMETRY (7)
IONOPHORE (6)
COULOMETRY (5)
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NITRATE (3)
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SELECTIVITY (3)
SENSORS (3)
SPECIATION (3)
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CHLORIDE (2)
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COPOLYMER MEMBRANE (2)
ELECTRON HOPPING (2)
ETHYNYLFERROCENE (2)
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ION TRANSFER VOLTAMMETRY (2)
ION‐SELECTIVE MEMBRANES (2)
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NITRITE (2)
OPTODE (2)
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REFERENCE ELECTRODE (2)
SOLID CONTACT TRANSDUCER (2)
SOLVENT POLYMERIC MEMBRANE (2)
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THIN LAYER COULOMETRY (2)
TITRATION (2)
CD 2 + -SELECTIVE ELECTRODE (1)
ABSORBANCE (1)
AGAROSE (1)
ALKALINITY (1)
ALKALINITÄT (1)
ANALYTICAL METHODS (1)
ANION DETECTION (1)
ANION IONOPHORES (1)
ANION-EXCHANGE MICROEMULSION (1)
ANION-EXCHANGER MEMBRANE (1)
ANION-SELECTIVE MEMBRANE ELECTRODE (1)
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INFONA - science communication portal

Search results for: Eric Bakker

Thin Layer Membrane Systems as Rapid Development Tool for Potentiometric Solid Contact Ion‐selective Electrodes

A Solid‐State Reference Electrode Based on a Self‐Referencing Pulstrode

A Solid‐State Reference Electrode Based on a Self‐Referencing Pulstrode

Light‐Addressable Ion Sensing for Real‐Time Monitoring of Extracellular Potassium

Light‐Addressable Ion Sensing for Real‐Time Monitoring of Extracellular Potassium

Ion‐exchange Microemulsions for Eliminating Dilute Interferences in Potentiometric Determinations

Ion Transfer Voltammetry in Polyurethane Thin Films Based on Functionalised Cationic [6]Helicenes for Carbonate Detection

Assessment of cam morphology of the hip with ultra sound imaging by physical therapists is reliable and valid

Surface‐Doped Polystyrene Microsensors Containing Lipophilic Solvatochromic Dye Transducers

Electron Hopping between Fe 3 d States in Ethynylferrocene‐doped Poly(Methyl Methacrylate)‐poly(Decyl Methacrylate) Copolymer Membranes

Ion Transfer Voltammetry at Thin Films Based on Functionalized Cationic [6]Helicenes

Cover Picture: Electron Hopping between Fe 3 d States in Ethynylferrocene‐doped Poly(Methyl Methacrylate)‐poly(Decyl Methacrylate) Copolymer Membranes (Electroanalysis 4/2018)

Describing Ion Exchange at Membrane Electrodes for Ions of Different Charge

Fluorinated tripodal receptors for potentiometric chloride detection in biological fluids

Agarose hydrogel containing immobilized pH buffer microemulsion without increasing permselectivity

Electrochemical Mechanism of Ferrocene-Based Redox Molecules in Thin Film Membrane Electrodes

Phenytoin speciation with potentiometric and chronopotentiometric ion-selective membrane electrodes

Characterization of Salophen Co(III) Acetate Ionophore for Nitrite Recognition

Thin‐Layer Chemical Modulations by a Combined Selective Proton Pump and pH Probe for Direct Alkalinity Detection

Thin‐Layer Chemical Modulations by a Combined Selective Proton Pump and pH Probe for Direct Alkalinity Detection

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