Electrophoretic Deposition of Metal Nanoparticle Monolayers from Nonpolar Solvents for Hydrogen Sensing

We report on the electrophoretic deposition (EPD) of metal nanoparticles (NPs) prepared in reverse micelles on semiconductor substrates with the aim to fabricate sensitive Schottky-based hydrogen sensors with fast response and high degree of selectivity. We discuss the mechanism of NP monolayer formation and show which parameters are essential for the transition from three-dimensional to two-dimensional growth.

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A novel 4-sensor fast-response aerodynamic probe for non-isotropic turbulence measurement in turbomachinery flows

Journal of the Global Power and Propulsion Society ◽

10.22261/jgpps.uals07 ◽

2018 ◽

Vol 2 ◽

pp. UALS07 ◽

Cited By ~ 2

Author(s):

Alexandros C. Chasoglou ◽

Michel Mansour ◽

Anestis I. Kalfas ◽

Reza S. Abhari

Keyword(s):

Isotropic Turbulence ◽

Three Dimensional ◽

Fast Response ◽

Turbulent Structures ◽

Turbulence Measurement ◽

Time Resolved ◽

Accuracy Comparison ◽

Degree Of Anisotropy ◽

Current Article ◽

High Degree

Abstract In modern computational studies for turbomachinery applications, time, length scales and isotropy of turbulent structures are important for representative modelling. To this end, experimental data are essential to validate the numerical tools. The current article presents the development and application of a newly designed 4-sensor Fast Response Aerodynamic Probe (FRAP-4S) enabling time-resolved measurement of the three-dimensional unsteady flow velocity vector in turbomachines. The miniature multi-sensor probe demonstrates a 4 mm probe-tip. In the first part of this article the design, manufacturing and calibration results of the FRAP-4S are presented in detail. To assess the newly developed probe accuracy, comparison against traditional instrumentation developed at the Laboratory for Energy Conversion is also provided. In the second part of this work, measurements are performed at the rotor exit of a one-and-a-half stage, unshrouded and highly-loaded axial turbine configuration. The results showed increased level of unsteadiness and turbulence levels with peak-to-peak fluctuation from 5 to 35%. More importantly, in some regions stream-wise unsteadiness was found to be ten times higher, compared to the cross-wise components, an indication of the high degree of anisotropy.

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TEM Investigation of Si/βFeSi2/Si (100) and (111) Heterostructures Formed by Fe Implantation

MRS Proceedings ◽

10.1557/proc-283-885 ◽

1992 ◽

Vol 283 ◽

Cited By ~ 3

Author(s):

C. W. T. Bulle-Lieuwma ◽

D. J. Oostra ◽

D. E. W. Vandenhoudt

Keyword(s):

Three Dimensional ◽

Si Substrate ◽

Structural Examination ◽

Si Substrates ◽

Transmission Electron ◽

Dimensional Growth ◽

Buried Layer ◽

High Degree ◽

Dimensional Surface ◽

Fe Implantation

ABSTRACTSi/βFeSi2/Si (100) and (111) structures were obtained by implantation of 450 keV Fe+ ions with a dose of 6×1017 Fe+ ions/ cm2 into Si substrates. A continuous buried βFeSi2 layer with thickness of 250 nm was formed during subsequent annealing. By transmission electron microscopy it has been found that for (100) Si the layer consists of βFeSi2 grains with lateral dimensions of approximately O.5 μm and for (111) Si of grains of 5 μm in size. The βFeSi2 films exhibit a high degree of epitaxy with the Si substrate. A detailed structural examination shows the occurrence of several epitaxial relationships of βFeSi2 with the Si substrate. In contrast to two-dimensional surface growth techniques, the formation of a buried layer by implantation occurs by a three-dimensional growth process by the coalescence of βFeSi2 precipitates. The different orientations of the βFeSi2 grains in the buried layer are already established by the orientation of the precipitates formed during implantation.

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Hormonal modulation of ishikawa cells during three-dimensional growth in vitro☆

Journal of the Society for Gynecologic Investigation ◽

10.1016/s1071-5576(98)00015-x ◽

1998 ◽

Vol 5 (4) ◽

pp. 217-223 ◽

Cited By ~ 4

Author(s):

D PINELLI ◽

J DRAKE ◽

M WILLIAMS ◽

D CAVANAGH ◽

J BECKER

Keyword(s):

Three Dimensional ◽

Ishikawa Cells ◽

Hormonal Modulation ◽

Dimensional Growth

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Operational Model and its Validation with Drift Tests in Water Areas Around the Baltic Sea

Water Quality Research Journal ◽

10.2166/wqrj.1994.019 ◽

1994 ◽

Vol 29 (2-3) ◽

pp. 293-308

Author(s):

J. Koponen ◽

M. Virtanen ◽

H. Vepsä ◽

E. Alasaarela

Keyword(s):

Three Dimensional ◽

Fast Response ◽

Velocity Measurements ◽

Short Term ◽

Large Lakes ◽

Operational Model ◽

Water Currents ◽

Emergency Situations ◽

Sensitivity Tests ◽

The Baltic

Abstract Three-dimensional (3-D) mathematical models of water currents, transport, mixing, reaction kinetic, and interactions with bottom and air have been used in Finland regularly since 1982 and applied to about 40 cases in large lakes, inland seas and their coastal waters. In each case, model validity has been carefully tested with available flow velocity measurements, tracer studies and water quality observations. For operational use, i.e., for spill combatting and sea rescue, the models need fast response, proven validity and illustrative visualization. In 1987-90, validated models were implemented for operational use at five sea areas along the Finnish coast. Further validation was obtained in model applications from nine documented or arranged cases and from seven emergency situations. Sensitivity tests supplement short-term validation. In the Bothnian Sea, it was nescessary to start the calculation of water currents three days prior to the start of the experiment to reduce initial inaccuracies and to make the coastal transport estimates meaningful.

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Self – assembly of model surfactants as reverse micelles in nonpolar solvents and their role as interfacial tension modifiers

Colloids and Surfaces A Physicochemical and Engineering Aspects ◽

10.1016/j.colsurfa.2021.126244 ◽

2021 ◽

Vol 615 ◽

pp. 126244

Author(s):

E. Mayoral ◽

J.A. Arcos-Casarrubias ◽

A. Gama Goicochea

Keyword(s):

Interfacial Tension ◽

Self Assembly ◽

Reverse Micelles ◽

Nonpolar Solvents

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A 3D hydrodynamic flow-focusing device for cell sorting

Microfluidics and Nanofluidics ◽

10.1007/s10404-021-02425-y ◽

2021 ◽

Vol 25 (3) ◽

Author(s):

Xiaofei Yuan ◽

Andrew Glidle ◽

Hitoshi Furusho ◽

Huabing Yin

Keyword(s):

Cell Sorting ◽

Control Strategies ◽

Three Dimensional ◽

Hydrodynamic Flow ◽

Proof Of Concept ◽

Flow Focusing ◽

Hydrodynamic Focusing ◽

Cell Handling ◽

Fluid Flow Control ◽

High Degree

AbstractOptical-based microfluidic cell sorting has become increasingly attractive for applications in life and environmental sciences due to its ability of sophisticated cell handling in flow. The majority of these microfluidic cell sorting devices employ two-dimensional fluid flow control strategies, which lack the ability to manipulate the position of cells arbitrarily for precise optical detection, therefore resulting in reduced sorting accuracy and purity. Although three-dimensional (3D) hydrodynamic devices have better flow-focusing characteristics, most lack the flexibility to arbitrarily position the sample flow in each direction. Thus, there have been very few studies using 3D hydrodynamic flow focusing for sorting. Herein, we designed a 3D hydrodynamic focusing sorting platform based on independent sheath flow-focusing and pressure-actuated switching. This design offers many advantages in terms of reliable acquisition of weak Raman signals due to the ability to precisely control the speed and position of samples in 3D. With a proof-of-concept demonstration, we show this 3D hydrodynamic focusing-based sorting device has the potential to reach a high degree of accuracy for Raman activated sorting.

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Comparative Study of Silk Fibroin-Based Hydrogels and Their Potential as Material for 3-Dimensional (3D) Printing

Molecules ◽

10.3390/molecules26133887 ◽

2021 ◽

Vol 26 (13) ◽

pp. 3887

Author(s):

Watcharapong Pudkon ◽

Chavee Laomeephol ◽

Siriporn Damrongsakkul ◽

Sorada Kanokpanont ◽

Juthamas Ratanavaraporn

Keyword(s):

3D Printing ◽

Silk Fibroin ◽

Biomedical Applications ◽

Mechanical Stability ◽

Three Dimensional ◽

Structure Stability ◽

3 Dimensional ◽

Critical Technology ◽

Box Structure ◽

High Degree

Three-dimensional (3D) printing is regarded as a critical technology in material engineering for biomedical applications. From a previous report, silk fibroin (SF) has been used as a biomaterial for tissue engineering due to its biocompatibility, biodegradability, non-toxicity and robust mechanical properties which provide a potential as material for 3D-printing. In this study, SF-based hydrogels with different formulations and SF concentrations (1–3%wt) were prepared by natural gelation (SF/self-gelled), sodium tetradecyl sulfate-induced (SF/STS) and dimyristoyl glycerophosphorylglycerol-induced (SF/DMPG). From the results, 2%wt SF-based (2SF) hydrogels showed suitable properties for extrusion, such as storage modulus, shear-thinning behavior and degree of structure recovery. The 4-layer box structure of all 2SF-based hydrogel formulations could be printed without structural collapse. In addition, the mechanical stability of printed structures after three-step post-treatment was investigated. The printed structure of 2SF/STS and 2SF/DMPG hydrogels exhibited high stability with high degree of structure recovery as 70.4% and 53.7%, respectively, compared to 2SF/self-gelled construct as 38.9%. The 2SF/STS and 2SF/DMPG hydrogels showed a great potential to use as material for 3D-printing due to its rheological properties, printability and structure stability.

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