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Integrated impedance sensing of liquid sample plug flow enables automated high throughput NMR spectroscopy

Microsystems & Nanoengineering 2021年第2期7卷 177-193页

作者： Omar Nassar Mazin Jouda Michael Rapp dario mager Jan G.Korvink Neil MacKinnon Institute of Microstructure Technology Karlsruhe Institute of Technology(KIT)Hermann-von-Helmholtz-Platz 176344Eggenstein-LeopoldshafenGermany

A novel approach for automated high throughput NMR spectroscopy with improved mass-sensitivity is accomplished by integrating microfluidic technologies and micro-NMR resonators.A flow system is utilized to transport a sample of interest from outside the NMR magnet through the NMR detector,circumventing the relatively vast dead volume in the supplying tube by loading a series of individual sample plugs separated by an immiscible *** dual-phase flow demands a real-time robust sensing system to track the sample position and velocities and synchronize the NMR *** this contribution,we describe an NMR probe head that possesses a microfluidic system featuring:(i)a micro saddle coil for NMR spectroscopy and(ii)a pair of interdigitated capacitive sensors flanking the NMR detector for continuous position and velocity monitoring of the plugs with respect to the NMR *** system was successfully tested for automating flow-based measurement in a 500 MHz NMR system,enabling high resolution spectroscopy and NMR sensitivity of 2.18 nmol s1/2 with the flow sensors in *** flow sensors featured sensitivity to an absolute difference of 0.2 in relative permittivity,enabling distinction between most common *** was demonstrated that a fully automated NMR measurement of nine individual 120μL samples could be done within 3.6 min or effectively 15.3 s per sample.

关键词： flow spectroscopy enable

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Electrospun carbon nanofibre-assisted patterning of metal oxide nanostructures

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Microsystems & Nanoengineering 2022年第3期8卷 263-276页

作者： Monsur Islam Christian Dolle Ahsana Sadaf Peter G.Weidler Bharat Sharma Yolita M.Eggeler dario mager Jan G.Korvink Institute of Microstructure Technology Karlsruhe Institute of TechnologyHermann-von-Helmholtz-Platz 176344 Eggenstein-LeopoldshafenGermany Microscopy of Nanoscale Structures&Mechanisms(MNM) Laboratory for Electron Microscopy(LEM)Karlsruhe Institute of TechnologyEngesserstr.7D-76131 KarlsruheGermany Institut fur Funktionlle Grenzflachen Karlsruhe Institute of TechnologyHermann-von-Helmholtz-Platz 176344 Eggenstein-LeopoldshafenGermany

This work establishes carbon nanofibre-mediated patterning of metal oxide nanostructures,through the combination of electrospinning and vapor-phase transport *** of a suitable precursor with subsequent carbonization results in the patterning of catalyst gold nanoparticles embedded within carbon *** vapor-phase transport growth,these nanofibres allow preferential growth of one-dimensional metal oxide nanostructures,which grow radilly outward from the nanofibril axis,ielding a hairy caterpilr-ike *** synthesis of metal oxide caterpilars is demonstrated using zinc oxide,indium oxide,and tin *** and substrate temperatures play the most crucial role in determining the morphology of the metal oxide caterpillars,whereas the distribution of the nanofibres also has a significant impact on the overall *** the current methodology with near-field electrospinning further facilitates user-defined custom patterning of metal oxide caterpllr-like structures.

关键词： fibre carbon patterning

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Pyrolysis-induced shrinking of threedimensional structures fabricated by twophoton polymerization:experiment and theoretical model

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Microsystems & Nanoengineering 2019年第1期5卷 303-315页

作者： Braulio Cardenas-Benitez Carsten Eschenbaum dario mager Jan G.Korvink Marc JMadou Uli Lemmer Israel De Leon Sergio O.Martinez-Chapa School of Engineering and Sciences Tecnologico de MonterreyAv.Eugenio Garza Sada 2501 Sur64849 MonterreyNLMexico Light Technology Institute Karlsruhe Institute of Technology(KIT)Engesserstraße 1376131 KarlsruheGermany Institute of Microstructure Technology Karlsruhe Institute of Technology(KIT)Hermann-von-Helmholtz-Platz 176344 Eggenstein-LeopoldshafenGermany Department of Mechanical and Aerospace Engineering University of CaliforniaIrvine4200 Engineering GatewayIrvineCA 92697USA

The introduction of two-photon polymerization(TPP)into the area of Carbon Micro Electromechanical Systems(CMEMS)has enabled the fabrication of three-dimensional glassy carbon nanostructures with geometries previously unattainable through conventional UV *** of TPP structures conveys a characteristic reduction of feature size—one that should be properly estimated in order to produce carbon microdevices with *** this work,we studied the volumetric shrinkage of TPP-derived microwires upon pyrolysis at 900℃.Through this process,photoresist microwires thermally decompose and shrink by as much as 75%,resulting in glassy carbon nanowires with linewidths between 300 and 550 *** after the thermal decomposition induced by the pyrolysis step,the linewidth of the carbon nanowires was found to be dependent on the TPP exposure *** have also found that the thermal stress induced during the pyrolysis step not only results in axial elongation of the nanowires,but also in buckling in the case of slender carbon nanowires(for aspect ratios greater than 30).Furthermore,we show that the calculated residual mass fraction that remains after pyrolysis depends on the characteristic dimensions of the photoresist microwires,a trend that is consistent with several works found in the *** phenomenon is explained through a semi-empirical model that estimates the feature size of the carbon structures,serving as a simple guideline for shrinkage evaluation in other designs.

关键词： lithography pyrolysis structures

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