Search results for: Dimos Poulikakos

Items from 1 to 20 out of 111 results

article

Enhanced Condensation on Soft Materials through Bulk Lubricant Infusion (Adv. Funct. Mater. 17/2022)

Chander Shekhar Sharma, Athanasios Milionis, Abhinav Naga, Cheuk Wing Edmond Lam, more

Advanced Functional Materials > 32 > 17 > n/a - n/a

Bulk Lubricant Infusion In article number 2109633, Dimos Poulikakos and co‐workers show that bulk lubricant infusion in soft materials can significantly increase condensate droplet shedding through a large reduction in viscoelastic dissipation, while simultaneously promoting high droplet nucleation density. This behavior markedly enhances water condensation and promotes the suitability of such materials...

article

Enhanced Condensation on Soft Materials through Bulk Lubricant Infusion

Chander Shekhar Sharma, Athanasios Milionis, Abhinav Naga, Cheuk Wing Edmond Lam, more

Advanced Functional Materials > 32 > 17 > n/a - n/a

Soft substrates enhance droplet nucleation during water vapor condensation because their deformability inherently reduces the energetic threshold for heterogeneous nucleation relative to rigid substrates. However, this enhancement is counteracted later in the condensation cycle, when substrate viscoelastic dissipation inhibits condensate droplet shedding. Here a polydimethylsiloxane (PDMS) based organogel...

article

Metals by Micro‐Scale Additive Manufacturing: Comparison of Microstructure and Mechanical Properties

Alain Reiser, Lukas Koch, Kathleen A. Dunn, Toshiki Matsuura, more

Advanced Functional Materials > 30 > 28 > n/a - n/a

Many emerging applications in microscale engineering rely on the fabrication of 3D architectures in inorganic materials. Small‐scale additive manufacturing (AM) aspires to provide flexible and facile access to these geometries. Yet, the synthesis of device‐grade inorganic materials is still a key challenge toward the implementation of AM in microfabrication. Here, a comprehensive overview of the microstructural...

article

Facile endothelium protection from TNF-α inflammatory insult with surface topography

Georgios Stefopoulos, Costanza Giampietro, Volkmar Falk, Dimos Poulikakos, more

Biomaterials > 2017 > 138 > C > 131-141

Adverse events triggered by the direct contact between blood and synthetic materials constitute a sincere shortcoming of cardiovascular implant technology. A well-connected autologous endothelium, generated through the process of endothelialization, impedes such interaction and endows the implant luminal interface with optimal protection. The endothelialization of artificial substrates is the result...

article

Mass transport enhancement in redox flow batteries with corrugated fluidic networks

Kleber Marques Lisboa, Julian Marschewski, Neil Ebejer, Patrick Ruch, more

Journal of Power Sources > 2017 > 359 > C > 322-331

We propose a facile, novel concept of mass transfer enhancement in flow batteries based on electrolyte guidance in rationally designed corrugated channel systems. The proposed fluidic networks employ periodic throttling of the flow to optimally deflect the electrolytes into the porous electrode, targeting enhancement of the electrolyte-electrode interaction. Theoretical analysis is conducted with...

article

Left Ventricular Assist Devices: Challenges Toward Sustaining Long-Term Patient Care

Marianne Schmid Daners, Friedrich Kaufmann, Raffael Amacher, Gregor Ochsner, more

Annals of Biomedical Engineering > 2017 > 45 > 8 > 1836-1851

Over the last few decades, the left ventricular assist device (LVAD) technology has been tremendously improved transitioning from large and noisy paracorporeal volume displacement pumps to small implantable turbodynamic devices with only a single transcutaneous element, the driveline. Nevertheless, there remains a great demand for further improvements to meet the challenge of having a robust and safe...

article

On the mass transfer performance enhancement of membraneless redox flow cells with mixing promoters

Julian Marschewski, Patrick Ruch, Neil Ebejer, Omar Huerta Kanan, more

International Journal of Heat and Mass Transfer > 2017 > 106 > C > 884-894

Membraneless flow cells for electrochemical energy conversion exploit the laminarity of microscale flows to avoid undesirable mixing of reactants. To increase the performance of microfluidic redox flow cells we employ herringbone-inspired flow promoters, thereby increasing convection of each individual species to the electrodes, while minimizing reactant mixing. Polarization curves from electrochemical...

article

The breakup of intravascular microbubbles and its impact on the endothelium

Wolfgang Wiedemair, Zeljko Tukovic, Hrvoje Jasak, Dimos Poulikakos, more

Biomechanics and Modeling in Mechanobiology > 2017 > 16 > 2 > 611-624

Encapsulated microbubbles (MBs) serve as endovascular agents in a wide range of medical ultrasound applications. The oscillatory response of these agents to ultrasonic excitation is determined by MB size, gas content, viscoelastic shell properties and geometrical constraints. The viscoelastic parameters of the MB capsule vary during an oscillation cycle and change irreversibly upon shell rupture....

article

Drug deposition in coronary arteries with overlapping drug-eluting stents

Farhad Rikhtegar, Elazer R. Edelman, Ufuk Olgac, Dimos Poulikakos, more

Journal of Controlled Release > 2016 > 238 > C > 1-9

Drug-eluting stents are accepted as mainstream endovascular therapy, yet concerns for their safety may be under-appreciated. While failure from restenosis has dropped to below 5%, the risk of stent thrombosis and associated mortality remain relatively high. Further optimization of drug release is required to minimize thrombosis risk while maintaining therapeutic dose.The complex three-dimensional...

chapter

Reconstruction of Cerebrospinal Fluid Flow in the Third Ventricle Based on MRI Data

Vartan Kurtcuoglu, Michaela Soellinger, Paul Summers, Kevin Boomsma, more

Lecture Notes in Computer Science > Medical Image Computing and Computer-Assisted Intervention – MICCAI 2005 > Physically-Based Modeling > 786-793

A finite-volume model of the cerebrospinal fluid (CSF) system encompassing the third ventricle and the aqueduct of Sylvius was used to reconstruct CSF velocity and pressure fields based on MRI data. The flow domain geometry was obtained through segmentation of MRI brain anatomy scans. The movement of the domain walls was interpolated from brain motion MRI scans. A constant pressure boundary condition...

chapter

Identification of Atherosclerotic Lesion-Prone Sites through Patient-Specific Simulation of Low-Density Lipoprotein Accumulation

Ufuk Olgac, Vartan Kurtcuoglu, Stefan C. Saur, Dimos Poulikakos

Lecture Notes in Computer Science > Medical Image Computing and Computer-Assisted Intervention – MICCAI 2008 > Modeling II > 774-781

We present a patient-specific model of low-density lipoprotein (LDL) transport from blood into arterial walls. To this end, the arterial endothelium is represented by a shear-stress dependent three-pore model taking into account blood plasma and LDL passage through the vesicular pathway, normal junctions and leaky junctions. We virtually remove atherosclerotic plaque from an in-vivo left coronary...

article

Significant heat transfer enhancement in microchannels with herringbone-inspired microstructures

Julian Marschewski, Raphael Brechbühler, Stefan Jung, Patrick Ruch, more

International Journal of Heat and Mass Transfer > 2016 > 95 > C > 755-764

Herringbone microstructures are a very promising class of flow promoters to passively enhance heat transfer in microchannels by efficiently triggering helicoidal fluid motion. A host of applications are envisioned to benefit from heat transfer enhancement in microchannels, including microfluidic interlayer cooling of 3D electronic chip stacks, or advanced concepts of integrated cooling and electrochemical...

article

Transparent Electrodes: Electrohydrodynamic NanoDrip Printing of High Aspect Ratio Metal Grid Transparent Electrodes (Adv. Funct. Mater. 6/2016)

Julian Schneider, Patrik Rohner, Deepankur Thureja, Martin Schmid, more

Advanced Functional Materials > 26 > 6 > 805 - 805

D. Poulikakos and co‐workers explain on page 833 how electro‐hydrodynamic NanoDrip printing enables the fully additive fabrication of high‐aspect‐ratio nanostructures. Tiny gold nanoparticle ink droplets are ejected from a much larger nozzle to build up gold nanowall grids that show impressive optoelectronic properties and have great potential as transparent electrodes in display and solar cell applications...

article

Electrohydrodynamic NanoDrip Printing of High Aspect Ratio Metal Grid Transparent Electrodes

Julian Schneider, Patrik Rohner, Deepankur Thureja, Martin Schmid, more

Advanced Functional Materials > 26 > 6 > 833 - 840

The transparent conducting electrode is an essential component in many contemporary and future devices, ranging from displays to solar cells. Fabricating transparent electrodes requires a balancing act between sufficient electrical conductivity and high light transmittance, both affected by the involved materials, fabrication methodology, and design. While metal films possess the highest conductivity...

article

A simplified approach to hotspot alleviation in microprocessors

Chander Shekhar Sharma, Manish K. Tiwari, Dimos Poulikakos

Applied Thermal Engineering > 2016 > 93 > C > 1314-1323

Hotspots in microprocessors arise due to non-uniform utilization of the underlying integrated circuits during chip operation. Conventional liquid cooling using microchannels leads to undercooling of the hotspot areas and overcooling of the background area of the chip resulting in excessive temperature gradients across the chip which adversely affects the chip performance and reliability. This problem...

article

Pore scale modeling of cold-start emissions in foam based catalytic reactors

Jan von Rickenbach, Francesco Lucci, Panayotis Dimopoulos Eggenschwiler, Dimos Poulikakos

Chemical Engineering Science > 2015 > 138 > C > 446-456

Foam based catalytic converters have the potential to decrease cold-start emissions in automotive applications due to their low thermal inertia and excellent mass and heat transfer properties. A 3D CFD model of a foam based catalytic converter is proposed and employed here to simulate cold-start transients. The modeled phenomena include conjugate heat transfer, finite rate washcoat diffusion and detailed...

article

A high-efficiency hybrid high-concentration photovoltaic system

Severin Zimmermann, Henning Helmers, Manish K. Tiwari, Stephan Paredes, more

International Journal of Heat and Mass Transfer > 2015 > 89 > C > 514-521

Photovoltaic power generation is a growing renewable primary energy source, expected to assume a major role as we strive toward fossil fuel free energy production. However, the photovoltaic efficiencies limit the conversion of solar radiation into useful power output. Hybrid systems extend the functionality of concentrating photovoltaics (CPV) from simply generating electricity, to providing simultaneously...

article

Effect of washcoat diffusion resistance in foam based catalytic reactors

Jan von Rickenbach, Francesco Lucci, Chidambaram Narayanan, Panayotis Dimopoulos Eggenschwiler, more

Chemical Engineering Journal > 2015 > 276 > Complete > 388-397

Foam based catalytic converters are a promising alternative to the established honeycomb reactors for treatment of pollutants in automotive applications. They provide excellent mass transfer properties at reasonable pressure drop and have the potential to achieve high conversion at smaller external dimensions. The goal of this work is to determine the relative importance of washcoat diffusion resistance...

article

Design and packaging of a highly integrated microreactor system for high-temperature on-board hydrogen production

Bo Jiang, Alejandro J. Santis-Alvarez, Paul Muralt, Dimos Poulikakos, more

Chemical Engineering Journal > 2015 > 275 > C > 206-219

The development of miniaturized reactors that can operate at high temperatures independently is always of great interest for many applications, especially in the area of portable hydrogen production. Here we present such microreactor systems, made of glass, with integrated heating and fluidic features based on thick-film technology. Key considerations on design, fabrication and packaging of our systems...

article

A novel method of energy efficient hotspot-targeted embedded liquid cooling for electronics: An experimental study

Chander Shekhar Sharma, Gerd Schlottig, Thomas Brunschwiler, Manish K. Tiwari, more

International Journal of Heat and Mass Transfer > 2015 > 88 > C > 684-694

The shift to multicore microprocessor architecture is likely to result in higher coolant flow requirements and thus exacerbate the problem of increasing data center energy consumption, also with respect to hotspot elimination. We present and experimentally prove a novel concept, for embedded, hotspot-targeted and energy efficient cooling of heterogeneous chip power landscapes. The rationally distributed,...

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INFONA - science communication portal

Search results for: Dimos Poulikakos

Enhanced Condensation on Soft Materials through Bulk Lubricant Infusion (Adv. Funct. Mater. 17/2022)

Enhanced Condensation on Soft Materials through Bulk Lubricant Infusion

Metals by Micro‐Scale Additive Manufacturing: Comparison of Microstructure and Mechanical Properties

Facile endothelium protection from TNF-α inflammatory insult with surface topography

Mass transport enhancement in redox flow batteries with corrugated fluidic networks

Left Ventricular Assist Devices: Challenges Toward Sustaining Long-Term Patient Care

On the mass transfer performance enhancement of membraneless redox flow cells with mixing promoters

The breakup of intravascular microbubbles and its impact on the endothelium

Drug deposition in coronary arteries with overlapping drug-eluting stents

Reconstruction of Cerebrospinal Fluid Flow in the Third Ventricle Based on MRI Data

Identification of Atherosclerotic Lesion-Prone Sites through Patient-Specific Simulation of Low-Density Lipoprotein Accumulation

Significant heat transfer enhancement in microchannels with herringbone-inspired microstructures

Transparent Electrodes: Electrohydrodynamic NanoDrip Printing of High Aspect Ratio Metal Grid Transparent Electrodes (Adv. Funct. Mater. 6/2016)

Electrohydrodynamic NanoDrip Printing of High Aspect Ratio Metal Grid Transparent Electrodes

A simplified approach to hotspot alleviation in microprocessors

Pore scale modeling of cold-start emissions in foam based catalytic reactors

A high-efficiency hybrid high-concentration photovoltaic system

Effect of washcoat diffusion resistance in foam based catalytic reactors

Design and packaging of a highly integrated microreactor system for high-temperature on-board hydrogen production

A novel method of energy efficient hotspot-targeted embedded liquid cooling for electronics: An experimental study

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