scholarly journals Electrical Leakage Through Thin PDMS Microchannel Walls and its Applications

2008 ◽  
Author(s):  
Jiashu Sun ◽  
Saumitra K. Vajandar ◽  
Dongyan Xu ◽  
Yuejun Kang ◽  
Dongqing Li ◽  
...  
Keyword(s):  
Circuit Design ◽  
Dielectric Material ◽  
Microfluidic Channel ◽  
Microfluidic Channels ◽  
Experimental Characterization ◽  
Electrical Field ◽  
Pdms Channel ◽  
Pdms Microchannel ◽  
Individual Particles

PDMS is usually considered as a dielectric material and PDMS microchannel walls can be treated as an electrically insulated boundary. However, in certain layouts of microfluidic networks, electrical leakage through PDMS walls could significantly alter the electrical field in the microfluidic circuits, which must be carefully considered in microfluidic circuit design. We report on our experimental characterization of electrical leakage through PDMS microfluidic channel walls. Numerical modeling clearly disclosed the alteration of electrical field and electroosmotic velocity in the microfluidic channels because of the electrical leakage through the thin PDMS wall. In addition, we demonstrate that the electrical leakage through the PDMS channel wall can be used to realize trapping of individual particles at different locations inside the mcirofluidic channel by balancing the electroosmotic flow and electrophoretic migration of the particle.

Numerical and experimental characterization of a button-shaped miniaturized UHF antenna on magneto-dielectric substrate

2013 ◽  
Vol 5 (3) ◽  
pp. 231-239 ◽  
Author(s):  
Martino Aldrigo ◽  
Alessandra Costanzo ◽  
Diego Masotti ◽  
Carlo Baldisserri ◽  
Ioan Dumitru ◽  
...  
Keyword(s):  
Patch Antenna ◽  
Dielectric Material ◽  
Dielectric Substrate ◽  
Strontium Hexaferrite ◽  
Experimental Characterization ◽  
Small Patch ◽  
Barium Strontium ◽  
Matching Performance ◽  
Good Agreement

The design and characterization of a new broadband small patch antenna, based on an innovative magneto-dielectric material and suitable for wearable applications at 868 MHz, is presented. To reduce antenna dimensions, while preserving its radiation and matching performance, a barium-strontium hexaferrite Ba0.75Sr0.25Fe12O19 has been synthesized as the antenna substrate to achieve magnetic permeability double than vacuum in the band of interest. First material realization is characterized and dispersive permittivity and permeability behaviors are included in the design of a small patch antenna with a shorting-plate. A button-size realization is obtained and its suitability for wearable applications is numerically and experimentally demonstrated on body with and without the presence of conductive shielding. Very good agreement with measurements is demonstrated for both matching and radiation performance of the antenna.

Characterization of Printable Micro-Fluidic Channels for Organ Printing

2013 ◽  
Author(s):  
Yahui Zhang ◽  
Yin Yu ◽  
Ibrahim Tarik Ozbolat
Keyword(s):  
Fluid Transport ◽  
Complex Geometry ◽  
Porous Scaffold ◽  
Flow Characteristics ◽  
Microfluidic Channel ◽  
Microfluidic Channels ◽  
Thin Structure ◽  
Organ Printing ◽  
The Media

Despite great progress in tissue engineering, there still exist limitations in engineering and manufacturing thick tissues. The engineered construct is still trapped in a geometrically simple and thin structure due to an inefficient transportation system. In traditional scaffolding, the media exchange rate mainly depends on media diffusion. Even a porous scaffold cannot provide enough media for the high metabolic rate of thick tissue. Embedding microfluidic channels has great potential to increase media exchange capability. The existing microfluidic channel fabrication methods are limits as well. Microfluidic channels with interconnectivity, 3D dimension, or complex geometry have not been achieved. To address these issues, a novel printable microfluidic channel fabrication method is introduced in this paper. This research investigates the manufacturability of novel cellular micro-fluidic channels. The proposed micro-fluidic channels can directly construct a scaffold that will provide both support of mechanical integrity and fluid transport in 3D. The main purpose of this paper is to experimentally analyze the effect of dispensing parameters and media flow characteristics on resulting microfluidic channels.

Experimental Characterization of the Reliability of 3-Terminal Dual-Damascene Copper Interconnect Trees

2002 ◽  
Vol 716 ◽  
Author(s):  
C. L. Gan ◽  
C. V. Thompson ◽  
K. L. Pey ◽  
W. K. Choi ◽  
F. Wei ◽  
...  
Keyword(s):  
Stress Conditions ◽  
Experimental Characterization ◽  
Contact Lines ◽  
Tree Structures ◽  
Similar Test ◽  
Dual Damascene ◽  
Copper Interconnect ◽  
Test Conditions

AbstractElectromigration experiments have been carried out on simple Cu dual-damascene interconnect tree structures consisting of straight via-to-via (or contact-to-contact) lines with an extra via in the middle of the line. As with Al-based interconnects, the reliability of a segment in this tree strongly depends on the stress conditions of the connected segment. Beyond this, there are important differences in the results obtained under similar test conditions for Al-based and Cu-based interconnect trees. These differences are thought to be associated with variations in the architectural schemes of the two metallizations. The absence of a conducting electromigrationresistant overlayer in Cu technology, and the possibility of liner rupture at stressed vias lead to significant differences in tree reliabilities in Cu compared to Al.

Experimental Characterization of Mechanical Behavior of Cord-Rubber Composites

1982 ◽  
Vol 10 (1) ◽  
pp. 37-54 ◽  
Author(s):  
M. Kumar ◽  
C. W. Bert
Keyword(s):  
Response Characteristic ◽  
Cord Compression ◽  
Complete Characterization ◽  
Strain Response ◽  
Strain Gages ◽  
Experimental Characterization ◽  
Rubber Composites ◽  
Stress Strain ◽  
Strain Data

Abstract Unidirectional cord-rubber specimens in the form of tensile coupons and sandwich beams were used. Using specimens with the cords oriented at 0°, 45°, and 90° to the loading direction and appropriate data reduction, we were able to obtain complete characterization for the in-plane stress-strain response of single-ply, unidirectional cord-rubber composites. All strains were measured by means of liquid mercury strain gages, for which the nonlinear strain response characteristic was obtained by calibration. Stress-strain data were obtained for the cases of both cord tension and cord compression. Materials investigated were aramid-rubber, polyester-rubber, and steel-rubber.

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