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150 results on '"Andrieu‐Brunsen, Annette"'

34. Janus‐Type Hybrid Paper Membranes

Author

Nau, Maximilian, primary, Herzog, Nicole, additional, Schmidt, Johannes, additional, Meckel, Tobias, additional, Andrieu‐Brunsen, Annette, additional, and Biesalski, Markus, additional

Published
2019
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36. Fluid Flow Control in Cotton Threads with Mesoporous Silica Coatings.

Author

Mikolei, Joanna J., Stanzel, Mathias, Pardehkorram, Raheleh, Lehn, Robert, Ceolin, Marcelo, and Andrieu‐Brunsen, Annette

Subjects
MESOPOROUS silica, FLUID control, FLUID flow, FLUIDIC devices, EVAPORATION (Chemistry)
Abstract

Microfluidic devices are important, e.g. in the field of point of care diagnostics. They are of special importance, if they are fabricated out of cheap and renewable materials. Tackling complex separation or sensing problems profits from modular three‐dimensional fluidic devices. Using cotton threads as renewable material allows the modular design of three‐dimensional fluidic devices and networks. Here, fluidic threads with modular designed and tunable thread wettability are presented. The wettability is gradually adjusted from highly hydrophilic to hydrophobic. The thread wettability directly affects the fluid imbibition velocity as well as the distance, which the fluid imbibes into the thread. The wettability adjustment is based on a simple dense or mesoporous silica coating applied onto the cotton thread using sol‐gel chemistry and evaporation induced self‐assembly. In addition to wettability, the mesoporosity and the pore functionalization are used to tune the fluid velocity within the thread. Connecting different silica functionalized threads into one device by knotting them together, fluids can be guided through this network in a predicted manner, which allows a modular design of 3D microfluidic thread‐based devices. [ABSTRACT FROM AUTHOR]

Published
2023
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37. Gravure printing for mesoporous film preparation

Author

Herzog, Nicole, primary, Brilmayer, Robert, additional, Stanzel, Mathias, additional, Kalyta, Anastasia, additional, Spiehl, Dieter, additional, Dörsam, Edgar, additional, Hess, Christian, additional, and Andrieu-Brunsen, Annette, additional

Published
2019
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41. Surface Enhanced DNP Assisted Solid-State NMR of Functionalized SiO2 Coated Polycarbonate Membranes

Author

Kumari, Bharti, primary, John, Daniel, additional, Hoffmann, Paul, additional, Spende, Anne, additional, Toimil-Molares, Maria Eugenia, additional, Trautmann, Christina, additional, Hess, Christian, additional, Ruff, Philip, additional, Schulze, Marcus, additional, Stark, Robert, additional, Buntkowsky, Gerd, additional, Andrieu-Brunsen, Annette, additional, and Gutmann, Torsten, additional

Published
2018
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43. N-Methyl-2-pyrrolidone as a Reaction Medium for Gold(III)-Ion Reduction and Star-like Gold Nanostructure Formation

Author

Mirdamadi Esfahani, Maleknaz, Goerlitzer, Eric Sidney Aaron, Kunz, Ulrike, Vogel, Nicolas, Engstler, Joerg, and Andrieu-Brunsen, Annette

Abstract

The efficiency of a wet chemical route to synthesize gold nanostructures with tunable size and shape significantly depends on the applied solvent and the interaction of solvent molecules with other species such as gold ions. The ability of the organic solvent N-methyl-2-pyrrolidone (NMP) as a suitable medium for application in star-like gold nanostructure (AuNS) synthesis with a tunable morphology at ambient conditions has been investigated. The time-dependent analysis of the UV–vis absorption spectra of AuIIICl₄– in a pure NMP solution illustrates the role of NMP as simultaneous complexing and reducing agents. Kinetic studies indicate that AuIIICl₄– in NMP solution is reduced to AuICl₂–, with no need to use another reducing agent, any external energy sources, or solvent pretreatment. This is because AuI species stay stable in this solution unless poly(vinylpyrrolidone) (PVP) catalyzes their disproportionation. Morphological studies by transmission electron microscopy (TEM) specify the high-yield synthesis of AuNS with monocrystalline spikes in a concentrated NMP solution by PVP. This study illustrates that the presence of seeds, as another agent to catalyze the disproportionation of AuI species, makes it possible to synthesize AuNS in varying concentrations of PVP in this medium. The role of PVP concentration and the presence of seeds in the formation kinetics, morphology, and optical properties is systematically discussed. The results achieved through this study develop a straightforward and safe procedure for AuNS synthesis in high yield in a water-miscible organic polar solvent with tunable morphology and optical properties. Considering the high capability of NMP to dissolve various types of polymers and hydrophobic ligands, synthesizing AuNS in this solvent opens a window to a practical and easy way to fabricate gold-based nanomaterials with fascinating optical properties.

Published
2022
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46. Fluid Flow Programming in Paper-Derived Silica–Polymer Hybrids

Author

Dubois, Christelle, primary, Herzog, Nicole, additional, Rüttiger, Christian, additional, Geißler, Andreas, additional, Grange, Eléonor, additional, Kunz, Ulrike, additional, Kleebe, Hans-Joachim, additional, Biesalski, Markus, additional, Meckel, Tobias, additional, Gutmann, Torsten, additional, Gallei, Markus, additional, and Andrieu-Brunsen, Annette, additional

Published
2016
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48. Surface Enhanced DNP Assisted Solid-State NMR of Functionalized SiO2 Coated Polycarbonate Membranes

Author

Kumari, Bharti, John, Daniel, Hoffmann, Paul, Spende, Anne, Toimil-Molares, Maria Eugenia, Trautmann, Christina, Hess, Christian, Ruff, Philip, Schulze, Marcus, Stark, Robert, Buntkowsky, Gerd, Andrieu-Brunsen, Annette, and Gutmann, Torsten

Subjects
technology, industry, and agriculture
Abstract

Surface enhanced solid-state NMR by dynamic nuclear polarization (DNP SENS) enables the characterization of the inner-pore surface functionalization of porous etched ion-track membranes exhibiting low specific surface areas compared to typical SBA- or MCM-type mesoporous silica materials. The membranes were conformally coated with a 5 nm thin SiO2 layer by atomic layer deposition. This layer was subsequently modified by aminopropyl silane linkers that allow further functionalization via the terminal amine group. The results evidence that in principle DNP SENS is a capable tool to analyze more complex porous systems, e.g. bioinspired functional etched ion-track membranes down to the molecular level. These results are relevant also for single nanopore systems, for which a direct analysis of the channel surface functionalization is not feasible by classical characterization methods. The applicability of DNP SENS to complex porous systems requires the optimization of the sample preparation and measurement parameters.

Published
2021

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