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Han Gardeniers
University of Twente
Analytical chemistryChemistryMaterials scienceChromatographySilicon
132Publications
23H-index
2,283Citations
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Publications 129
Newest
#1Hoon Suk Rho (UM: Maastricht University)H-Index: 1
#1Hoon Suk RhoH-Index: 7
Last. Han Gardeniers (UT: University of Twente)H-Index: 23
view all 2 authors...
A microfluidic droplet-storage array that is capable of the continuous operation of droplet formation, storing, repositioning, retrieving, injecting and restoring is demonstrated. The microfluidic chip comprised four valve-assisted droplet generators and a 3 × 16 droplet-storage array. The integrated pneumatically actuated microvalves enable the precise control of aqueous phase dispensing, as well as carrier fluid flow path and direction for flexible manipulating water-in-oil droplets in the chi...
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#1Duy Le-Anh (UT: University of Twente)
#2Ashit Rao (UT: University of Twente)H-Index: 11
Last. Friedrich Gunther Mugele (UT: University of Twente)H-Index: 42
view all 8 authors...
To enable the study of improved oil recovery (IOR) from carbonate rock via laboratory experiments at the pore scale, we have developed a novel microfluidic chip containing a 3D packed bed of calcite particles. The utilization of fluorescently labeled water phase enabled visualization up to 1–2 particle layers with confocal laser scanning microscopy. Porosity and residual oil saturation (ROS) in this space are quantified from image stacks in the depth direction (Z). To obtain reliable average ROS...
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#1Ignaas Jimidar (Vrije Universiteit Brussel)
#2Kai Sotthewes (UT: University of Twente)H-Index: 11
Last. Gert Desmet (Vrije Universiteit Brussel)H-Index: 38
view all 4 authors...
Particle (monolayer) assembly is essential to various scientific and industrial applications, such as the fabrication of photonic crystals, optical sensors, and surface coatings. Several methods, i...
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#1Hoon Suk Rho (UM: Maastricht University)H-Index: 1
#2Henk-Willem Veltkamp (MESA+ Institute for Nanotechnology)H-Index: 1
Last. Pamela Habibovic (UM: Maastricht University)H-Index: 33
view all 6 authors...
Abstract This paper describes an innovative yet straightforward fabrication technique to create three-dimensional (3D) microstructures with controllable tapered geometries by combining conventional photolithography and thermal reflow of photoresist. Positive photoresist-based microchannel structures with varying width-to-length ratios were reflowed after their fabrication to generate 3D funnel structures with varying curvatures. A polydimethylsiloxane (PDMS) hourglass-shaped microchannel array w...
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#1Shu Ni (UT: University of Twente)
#2Erwin Berenschot (UT: University of Twente)H-Index: 20
Last. Niels Roelof Tas (UT: University of Twente)H-Index: 29
view all 8 authors...
The current progress of system miniaturization relies extensively on the development of 3D machining techniques to increase the areal structure density. In this work, a wafer-scale out-of-plane 3D silicon (Si) shaping technology is reported, which combines a multistep plasma etching process with corner lithography. The multistep plasma etching procedure results in high aspect ratio structures with stacked semicircles etched deep into the sidewall and thereby introduces corners with a proper geom...
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#1Hoon Suk Rho (UM: Maastricht University)H-Index: 1
#1Hoon Suk RhoH-Index: 7
Last. Han Gardeniers (MESA+ Institute for Nanotechnology)H-Index: 23
view all 7 authors...
A microfluidic protein aggregation device (microPAD) that allows the user to perform a series of protein incubations with various concentrations of two reagents is demonstrated. The microfluidic device consists of 64 incubation chambers to perform individual incubations of the protein at 64 specific conditions. Parallel processes of metering reagents, stepwise concentration gradient generation, and mixing are achieved simultaneously by pneumatic valves. Fibrillation of bovine insulin was selecte...
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#1Andrea Angulo (NYU: New York University)H-Index: 1
#2Peter van der Linde (UT: University of Twente)H-Index: 4
Last. David Fernandez Rivas (UT: University of Twente)H-Index: 13
view all 5 authors...
Summary Bubbles are known to influence energy and mass transfer in gas-evolving electrodes. However, we lack a detailed understanding on the intricate dependencies between bubble evolution processes and electrochemical phenomena. This review discusses our current knowledge on the effects of bubbles on electrochemical systems with the aim to identify opportunities and motivate future research in this area. We first provide a base background on the physics of bubble evolution as it relates to elec...
4 CitationsSource
#1Yihui ZhaoH-Index: 2
#2Pieter Westerik (MESA+ Institute for Nanotechnology)H-Index: 3
Last. Anja Bieberle-HütterH-Index: 22
view all 6 authors...
The photoelectrochemical (PEC) activity of microstructured electrodes remains low despite the highly enlarged surface area and enhanced light harvesting. To obtain a deeper understanding of the effect of 3D geometry on the PEC performance, well‐defined WO3/n‐Si and WO3/pn‐Si micropillar arrays are fabricated and subjected to a quantitative analysis of the relationship between the geometry of the micropillars (length, pitch) and their PEC activity. For WO3/n‐Si micropillars, it is found that the ...
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#2Han GardeniersH-Index: 1
Last. Han GardeniersH-Index: 23
view all 2 authors...
The conversion of methane was investigated in a packed-bed dielectric barrier discharge (DBD) plasma reactor operated at ambient conditions. High dielectric BaTiO3 was utilized as packing in comparison with γ-alumina, α-alumina, and silica-SBA-15. Results show a considerably lower conversion of CH4 and C2 yield for the BaTiO3 packed reactor, which is even less than that obtained for the nonpacked reactor. In contrast, the low dielectric alumina (γ and α) packed reactor improved the conversion of...
2 CitationsSource
#1Chris P. van Kampen (UT: University of Twente)
#2Erwin Berenschot (UT: University of Twente)H-Index: 20
Last. Niels Roelof Tas (UT: University of Twente)H-Index: 29
view all 7 authors...
We introduce a massive parallel NEMS flow restriction nano-slit array fabricated in a wafer scale process using self-aligned 3D-nanolithography on sharp convex corners created by anisotropic etching of the silicon crystal. The device consists of an array of 50.000 slits, all having a length of ∼360 nm and a width of ∼6 nm. A relatively low resistance (short pore throat) configuration ensures high throughput on the order of 25\ \mu \mathrm{g}/\mathrm{s}at 4 bar differential pressure. A dedicat...
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