Werner E. Morf
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View article: Theoretical treatment and numerical simulation of potential and concentration profiles in extremely thin non-electroneutral membranes used for ion-selective electrodes
Theoretical treatment and numerical simulation of potential and concentration profiles in extremely thin non-electroneutral membranes used for ion-selective electrodes Open
The applicability of extremely thin non-electroneutral membranes for ion-selective electrodes (ISEs) is investigated. A theoretical treatment of potential and concentration profiles in space-charge membranes of << 1 μm thickness is present…
View article: Ion-selective microelectrode array for intracellular detection on chip
Ion-selective microelectrode array for intracellular detection on chip Open
The design and fabrication of an Ion-Selective Electrode (ISE) array platform for in-vitro intracellular recording are presented. The platform is composed of two parts: 1) a glass chip with microchannels whose bottom part is patterned with…
View article: Current Response of Ionophore-Based Ion-Selective Electrode Membranes at Controlled Potential
Current Response of Ionophore-Based Ion-Selective Electrode Membranes at Controlled Potential Open
From electrochemical measurements at the interface of two immiscible electrolytes, the current at controlled potential is usually a linear function of the ion concentration in the aqueous phase. Surprisingly, a linear relationship between …
View article: Ion-Selective Microelectrode Array for Intracellular Detection on Chip
Ion-Selective Microelectrode Array for Intracellular Detection on Chip Open
The design and fabrication of an Ion-Selective Electrode (ISE) array platform for in-vitro intracellular recording are presented. The platform is composed of two parts: 1) a glass chip with microchannels whose bottom part is patterned with…
View article: Effects of controlled current on the response behavior of polymeric membrane ion-selective electrodes
Effects of controlled current on the response behavior of polymeric membrane ion-selective electrodes Open
The influence of external currents on the potential response of polymeric membrane ion-selective electrodes (ISEs) is analyzed theoretically. The treatment is based on the well-established potential model of ISE membranes, extended by cont…
View article: Immobilization of Biomolecules on Polyurethane Membrane Surfaces
Immobilization of Biomolecules on Polyurethane Membrane Surfaces Open
Lipophilic polymer membranes incorporating binding sites are widely used in various potentiometric, amperometric, and optical sensors. Here, we report on the biofunctional modification of the surface of a Ca(2+)-selective membrane. A photo…
View article: A Wireless Electrochemiluminescence Detector Applied to Direct and Indirect Detection for Electrophoresis on a Microfabricated Glass Device
A Wireless Electrochemiluminescence Detector Applied to Direct and Indirect Detection for Electrophoresis on a Microfabricated Glass Device Open
A novel electrochemiluminescence (ECL) detector is presented in this article. The detector is applied for micellar electrokinetic chromatographic separation of dichlorotris(2,2'-bipyridyl)ruthenium(II) hydrate [Ru-(bpy)] and dichlorotris(1…
View article: Making use of ion fluxes through potentiometric sensor membranes: ISEs with step responses at critical ion activities
Making use of ion fluxes through potentiometric sensor membranes: ISEs with step responses at critical ion activities Open
Ion-selective membrane electrodes (ISEs) were designed for which the ideal response to primary ions is switched on at a given critical sample activity. Only above this value, the sensors exhibit the conventional selectivity behavior dictat…
View article: Partial electroosmotic pumping in complex capillary systems
Partial electroosmotic pumping in complex capillary systems Open
This paper describes theoretically the behavior of partial electroosmotic and hydrodynamic flow in complex capillary systems. The equivalent hydraulic resistance and the equivalent electrical resistance of microfluidic systems are consider…
View article: Partial electroosmotic pumping in complex capillary systems
Partial electroosmotic pumping in complex capillary systems Open
A new micro total analysis system (μTAS) designed for volumetric nanotitrations, integrating two electroosmotically driven nanopumps and a sensor unit, is presented. The unique feature of the integrated electroosmotic pumps is their abilit…
View article: Calculated Effects of Membrane Transport on the Long-Term Response Behavior of Polymeric Membrane Ion-Selective Electrodes
Calculated Effects of Membrane Transport on the Long-Term Response Behavior of Polymeric Membrane Ion-Selective Electrodes Open
Zero-current ion transport through polymeric membranes of ion-selective electrodes (ISEs) alters the composition of the inner solution of these sensors. This causes long-term drifts of the electromotive force that are relevant for miniatur…
View article: Triangle-Programmed Coulometric Nanotitrations Completed by Continuous Flow with Potentiometric Detection
Triangle-Programmed Coulometric Nanotitrations Completed by Continuous Flow with Potentiometric Detection Open
Coulometric nanotitrations were realized in a microchannel system using a continuous-flow titration technique with a triangle current-time profile. Redox and acid-base titrations were carried out on Fe(II) and nitric acid samples, respecti…
View article: Effects of Ion Transport on the Potential Response of Ionophore-Based Membrane Electrodes: A Theoretical Approach
Effects of Ion Transport on the Potential Response of Ionophore-Based Membrane Electrodes: A Theoretical Approach Open
A theoretical description of the steady-state potential response of ionophore-based ion-selective electrodes is presented that, so far, is the most general formalism available. The treatment considers membrane systems with any number of io…
View article: Microfabricated Chemical Analysis Systems for Environmental Applications
Microfabricated Chemical Analysis Systems for Environmental Applications Open
Recent contributions to the design, development, and fabrication of microtechnological devices for chemical analysis are summarized. The discussion includes microdisk-electrode arrays for voltammetric analysis of trace metals, and micro to…
View article: μTAS for Volumetric or Coulometric Titrations of Nanomole Amounts of Analytes in Microliter Samples
μTAS for Volumetric or Coulometric Titrations of Nanomole Amounts of Analytes in Microliter Samples Open
A new μTAS integrating an electroosmotically driven nanopump, and a sensor and actuator cell for coulometric titration in continuous flow injection analysis, is presented. The unique feature of the new pumping system is its ability to pump…