Materials and Sensors Technologies Inc.

Glen Burnie, MD, United States

Materials and Sensors Technologies Inc.

Glen Burnie, MD, United States
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Aissa B.,Materials and Sensors Technologies Inc. | Nedil M.,Laboratoire Of Recherche Telebec En Communications Souterraines | Esam A.H.,P.A. College | Tabet N.,King Fahd University of Petroleum and Minerals | And 2 more authors.
Applied Physics Letters | Year: 2012

We report on the ambipolar operation of back-gated thin film field-effect transistors based on hybrid n-type-SiC/p-type-single-walled carbon nanotube networks made with a simple drop casting process. High-performances such an on/off ratio of 10 5, on-conductance of 20 μS, and a subthreshold swing of less than 165 mV/decades were obtained. The devices are air-stable and maintained their ambipolar operation characteristics in ambient atmosphere for more than two months. Finally, these hybrid transistors were utilized to demonstrate advanced logic NOR-gates. This could be a fundamental step toward realizing stable operating nanoelectronic devices. © 2012 American Institute of Physics.


Djordjevic B.B.,Materials and Sensors Technologies Inc.
International Journal of Microstructure and Materials Properties | Year: 2014

Laser ultrasonic sources and guided wave sensing methods, using non-contact transducers or sub-wavelength miniature sensors, are utilised to nondestructively evaluate structural defects or composite material properties. These methods enable in-plane ultrasonic signal testing and very accurate measurements of the ultrasonic directional velocities. Additionally, sensing of the guided wave modes changes, in the geometrically complex composite structures, enables detection of the material structural damage. Experimental data demonstrates reproducibility and feasibility of such tests to sense discontinuity (crack) type defects and characterise micro structural damage in the composite materials. Copyright © 2014 Inderscience Enterprises Ltd.


Aissa B.,Materials and Sensors Technologies Inc. | Aissa B.,Ecole Polytechnique de Montréal | Aissa B.,INRS - Institute National de la Recherche Scientifique | Nedil M.,Laboratoire Of Recherche Telebec En Communications Souterraines | And 6 more authors.
Applied Physics Letters | Year: 2013

This letter describes the fabrication and characterization of a fluidic patch antenna operating at the S-band frequency (4 GHz). The antenna prototype is composed of a nanocomposite material made by a liquid metal alloy (eutectic gallium indium) blended with single-wall carbon-nanotube (SWNTs). The nanocomposite is then enclosed in a polymeric substrate by employing the UV-assisted direct-writing technology. The fluidic antennas specimens feature excellent performances, in perfect agreement with simulations, showing an increase in the electrical conductivity and reflection coefficient with respect to the SWNTs concentration. The effect of the SWNTs on the long-term stability of antenna's mechanical properties is also demonstrated. © 2013 AIP Publishing LLC.


Djordjevic B.B.,Materials and Sensors Technologies Inc.
International SAMPE Symposium and Exhibition (Proceedings) | Year: 2010

Safe use of composite materials in critical structural applications demands independent structural integrity verification. Traditional ultrasonic non-destructive methods are inappropriate and often misleading when applied to anisotropic and complex composite materials. Complexity of the advanced composite materials structures represents challenges in developing optimized ultrasonic tests that can directly characterize mechanical properties of the material. In advanced technology applications such as aerospace and with industrial emphasis on economics and safety, it is critical to develop and apply new robust and practical ultrasonic nondestructive test (NDT) methods. New guided wave laser ultrasonic sources and small aperture receiving sensors configurations enable testing of advanced composites far beyond conventional ultrasonic capabilities. In contrast to pseudo-imaging methodology such as ultrasonic C-scan, guide wave response to in plane mechanical state of the composite is analyzed and this emerging technology explores the ability of the inhomogeneous, anisotropic composite material to propagate ultrasonic guided waves over a range of distances and part configurations. Appropriate customizing of ultrasonic transduction process enables measurements of material properties and estimate of defect conditions along in-plane sound propagation path. From guided wave acoustic response, one can develop meaningful estimate of material modulus, fatigue damage, thermal damage and sense mechanical defect conditions without need to point-vise scan the complete structure.


Djordjevic B.B.,Materials and Sensors Technologies Inc.
Materials Evaluation | Year: 2014

Composite mechanical damage is typically in the form of delaminations or disbonds (laminate-to-laminate or laminate-to-core), broken fibers due to impact, fatigue damage that affects the zone of composite material via micro cracking, fiber delaminations, fiber breaks and overall loss of mechanical modulus. It can be caused by thermal damage from fire, engine bleed air leaks, and prolonged exposure to heat above resin cure temperatures, as well as a combination of environmental effects due to extreme operational conditions. Ultrasonic testing (UT) enables extensive characterization of the composite materials' integrity, and many ultrasonic methodologies are in current use for the inspection of large-scale composites. Challenges for UT of composites are more complex and require better understanding of the ultrasound signal attenuation, ultrasonic signals frequency dependent behavior and consideration of ultrasonic signal modality. UT of composites for optimized operations requires additional consideration of the inspection parameters and a fresh evaluation of applicable UT modes. It is improper to extrapolate metals UT experience to the composite structures.


Djordjevic B.B.,Materials and Sensors Technologies Inc.
12th International Conference of the Slovenian Society for Non-Destructive Testing: Application of Contemporary Non-Destructive Testing in Engineering, ICNDT 2013 - Conference Proceedings | Year: 2013

Laser ultrasonic sources and guided wave sensing methods, using sub-wavelength miniature sensors, are utilized to nondestructively evaluate composite materials. These methods enable in-plane characterization of the ultrasonic signals directional velocities. Additionally, sensing of the guided wave modes changes, in the geometrically complex composite structures, enables detection of the material structural damage. Experimental data demonstrates reproducibility and feasibility of such tests to monitor and characterize development of micro structural damage in the composite materials.


Aissa B.,Materials and Sensors Technologies Inc. | Aissa B.,Ecole Polytechnique de Montréal | Therriault D.,Ecole Polytechnique de Montréal | Haddad E.,Materials and Sensors Technologies Inc. | Jamroz W.,Materials and Sensors Technologies Inc.
Advances in Materials Science and Engineering | Year: 2012

The development of self-healing materials is now being considered for real engineering applications. Over the past few decades, there has been a huge interest in materials that can self-heal, as this property can increase materials lifetime, reduce replacement costs, and improve product safety. Self-healing systems can be made from a variety of polymers and metallic materials. This paper reviews the main technologies currently being developed, particularly on the thermosetting composite polymeric systems. An overview of various self-healing concepts over the past decade is then presented. Finally, a perspective on future self-healing approaches using this biomimetic technique is offered. The intention is to stimulate debate and reinforce the importance of a multidisciplinary approach in this exciting field. Copyright © 2010 B. Assa et al.


Aissa B.,Materials and Sensors Technologies Inc. | Nechache R.,INRS - Institute National de la Recherche Scientifique | Haddad E.,Materials and Sensors Technologies Inc. | Jamroz W.,Materials and Sensors Technologies Inc. | And 2 more authors.
Applied Surface Science | Year: 2012

A self healing composite material consisting of 5-Ethylidene-2-Norbornene (5E2N) monomer reacted with Ruthenium Grubbs' Catalyst (RGC) was prepared. First, the kinetics of the 5E2N ring opening metathesis polymerization (ROMP) reaction RGC was studied as a function of temperature. We show that the polymerization reaction is still effective in a large temperature range (-15 to 45°C), occurring at short time scales (less than 1 min at 40°C). Second, the amount of RGC required for ROMP reaction significantly decreased through its nanostructuration by means of a UV-excimer laser ablation process. RGC nanostructures of few nanometers in size where successfully obtained directly on silicon substrates. The X-ray photoelectron spectroscopy data strongly suggest that the RGC still keep its original stoichiometry after nanostructuration. More importantly, the associated ROMP reaction was successfully achieved at an extreme low RGC concentration equivalent to (11.16 ± 1.28) × 10 -4 Vol.%, occurring at very short time reaction. This approach opens new prospects for using healing agent nanocomposite materials for self-repair functionality, thereby obtaining a higher catalytic efficiency per unit mass. © 2012 Elsevier B.V.


Aissa B.,Materials and Sensors Technologies Inc. | Aissa B.,Ecole Polytechnique de Montréal | Tabet N.,King Fahd University of Petroleum and Minerals | Nedil M.,Laboratoire Of Recherche Telebec En Communications Souterraines | And 4 more authors.
Applied Surface Science | Year: 2012

We report on the electromagnetic (EM) absorption potential and microwave heating capacity of amorphous hydrogenated silicon carbide thin films (a-SiC:H) in the 1-16 GHz frequency domain. a-SiC:H thin films with typical thickness of 1 μm were deposited by plasma enhanced chemical vapor deposition on [1 0 0] undoped silicon substrates, and exhibit a deep EM absorption - up to 96% of the total EM energy irradiation - which is systematically converted into heat. Two-wavelength pyrometer tests show that temperatures exceeding 2000 K can be reached in a very short time, less than 100 s exposure to microwaves, showing a promising potential for specific microwave heating applications. © 2012 Elsevier B.V. All rights reserved.


Patent
Materials and Sensors Technologies Inc. | Date: 2012-09-20

The present invention is seen to provide a new methodology, testing system designs and concept to enable in situ real time monitoring of the cure process. Apparatus, system, and method for the non-destructive, in situ monitoring of the time dependent curing of advanced materials using one or more differential ultrasonic waveguide cure monitoring probes. A differential ultrasonic waveguide cure monitoring probe in direct contact with the material to be cured and providing in situ monitoring of the cure process to enable assessment of the degree of cure or cure level in a non-cure related signal variances (e.g., temperature) independent calibrated response manner. A differential ultrasonic waveguide cure monitoring probe including a transducer coupled to a waveguide and incorporating correction and calibration methodology to accurately and reproducibly monitor the cure process and enable assessment of cure level via ultrasonic reflection measurements. The amplitude of the corrected interface response signal reflected from the probe-resin interface indicating changes in the modulus of the material during the cure.

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