Theodoros Baimpos

Max Planck Institute for Iron Research GmbH | MPIE · Department of Interface Chemistry and Surface Engineering

In this study, we analyze the two-phase bottom-up procedure applied by the Future and Emerging Technologies Program (FET-Open) at the Research Executive Agency (REA) of the European Commission (EC), for the evaluation of highly interdisciplinary, multi-beneficiary research proposals which request funding. In the first phase, remote experts assess t...

In the current work an experimental method is used in order to calculate the diffusivity (diffusion coefficient) of various vapors in thin zeolite films. The method is based on adsorption data from magnetoelastic sensors on top of which a zeolite layer was synthesized, and the diffusivity is extracted by fitting the data to Fick's laws of diffusion...

The importance of water on molecular ion structuring and charging mechanism of solid interfaces in room temperature ionic liquid (RTIL) is unclear and has been largely ignored. Water may alter structures, charging characteristics, and hence performance at electrified solid/RTIL interfaces and is utilized in various fields including energy storage,...

Gas adsorption in metal−organic-frameworks (MOFs) can dramatically affect the size of the crystals (expansion and/or shrinkage) or lead to distortion of their porous structure/framework. This can strongly affect mechan- ical properties of MOFs potentially leading to loss or improvement of the performance of applications such as membranes, filters,...

Unravelling the complexity of the macroscopic world relies on understanding the scaling of single-molecule interactions towards integral macroscopic interactions. Here, we demonstrate the scaling of single acid–amine interactions through a synergistic experimental approach combining macroscopic surface forces apparatus experiments and single-molecu...

Strong and particularly long ranged (>100nm) interaction forces between apposing hydrophobic lipid monolayers are now well understood in terms of a partial turn-over of mobile lipid patches, giving rise to a correlated long-range electrostatic attraction. Here we describe similarly strong long-ranged attractive forces between self-assembled monolay...

Structure and dynamics at electrochemical metal/liquid interfaces determine lifetime and stability of advanced and structural materials, and are fundamental to corrosive processes. Here, we present recent experiments with the newly developed and unique electrochemical surface force apparatus1,2,which allow us to unravel electrochemical oxidation an...

Structure and dynamics at electrochemical solid/liquid interfaces of metal electrodes drive functionality, stability and capabilities in a wide range of important technologies such as batteries, super capacitors, or fuel cells. In particular, with the downsizing of the electrochemical devices, electrochemistry in confined spaces (nanospaces) has be...

Structure and dynamics at electrochemical metal/liquid interfaces determine lifetime and stability of advanced and structural materials, and are fundamental to corrosive processes. Here, we present recent experiments with the newly developed and unique electrochemical surface force apparatus 1,2 , which allow us to unravel electrochemical oxidation...

Structure and dynamics at electrochemical solid/liquid interfaces of metal electrodes drive functionality, stability and capabilities in a wide range of important technologies such as batteries, super capacitors, or fuel cells. In particular, with the downsizing of the electrochemical devices, electrochemistry in confined spaces (nanospaces) has be...

Electrochemical solid|liquid interfaces are critically important for technological applications and materials for energy storage, harvesting and conversion. Yet, a real-time Ångstrom-resolved visualization of dynamic processes at electrified solid|liquid interfaces has not been feasible. Here we report a unique real-time atomistic view into dynamic...

Ions and water structuring at charged-solid/electrolyte interfaces and forces arising from interfacial structuring in solutions above 100 mM concentrations dominate structure and functionality in many physiological, geological and technological systems. In these concentrations electrolyte structuring occurs within the range of molecular dimensions....

Four different zeolite films of type FAU, LTA, MFI and b-oriented MFI were synthesized on top of magnetoelastic sensors in order to act as sensitive recognition layers for the detection of six different Volatile Organic Compounds, namely benzene, c-hexane, n-hexane, o- & p-xylene and ethyl-acetate. The FAU sensor shows the lowest minimum detection...

A magnetoelastic sensor is comprised of a magnetoealstic substrate (Metglas) and an active layer (zeolite). In this paper, a previous method that measures adsorption-induced stresses in Metglas is modified. That method which was demonstrated for Metglas/FAU and Metglas/LTA sensors, was based on fitting the humidity adsorption data of each sensor wi...

A new method is presented for measuring the stresses imposed on a substrate from a zeolite membrane either due to the synthesis of the zeolite film or due to adsorption induced strains. The resonance and anti-resonance frequencies of a zeolite/Metglas ribbon were measured and were related to the stress imposed on Metglas using the phenomenological...

Faujasite (FAU) has been used as the sensitive recognition layer on the outer surfaces of a Metglas magnetoelastic strip for the detection of volatile organic compounds (VOCs). The sensor combines the electromagnetic properties of the magnetoelastic material with the adsorption properties of the FAU crystals. At 120 degrees C and at 500ppm, the sen...

The elasticity and flexibility of a silicalite-1 film grown on a metglas ribbon is demonstrated. Adsorption of n-hexane induces "swelling" of the zeolite film, which causes the bending of the ribbon. The deformation is reversible, repeatable, and its magnitude depends on the adsorbed organic vapor.

Zeolite membranes are synthesized in the form of a polycrystalline zeolitic film on the external surface of a porous support. As a result, knowledge about the mechanical properties (i.e. expansion coefficient, hardness, Young modulus etc) of the zeolite membrane and the porous support, is very important for the design of mechanically stable zeolite...

A zeolite LTA film has been synthesized on a Metglas magnetoelastic gas sensor and it was used as the sensitive recognition layer. This novel sensor uses the molecular sieving property of the LTA in order to detect selectively propylene and not propane. These two molecules are frequently encountered together and are difficult to separate because of...

In this work, the commercial polymer BAYHYDROL-110 has been employed as the analyte-responsive recognition layer on a magnetoelastic sensor used to detect several volatile organic compounds. The sensor exhibits enhanced selectivity to o-xylene and p-xylene compared to six other tested volatile organic compounds as well as to humidity. The sensitivi...

This report presents the development of new selective gas sensors utilizing a b-oriented silicalite-1 layer-magneto-elastic ribbon assembly. The key principle for the operation of these sensors is monitoring the changes in the resonance frequency of the Metglas strip in relation to the concentration of a component in the gas phase. This technique p...

The scope of the current work is to present a relatively simple method for measuring the elastic properties (Young modulus) of silicalite-1, B-MFI and LTA films using magnetoelastic sensors. The Young modulus is calculated from resonance frequency shifts of Metglas 2826MBA magnetoelastic ribbons, on both sides of which zeolite films have been grown...

A novel method is presented for measuring the elastic properties of zeolite films using magnetoelastic sensors. The method is relatively simple and can be used to determine the effect of adsorbed molecules on the mechanical properties of the zeolite film. It is demonstrated using NaX films grown on Metglas ribbons. Measurements were taken as a func...