Dr. Colin G. Cameron Profile

Dr. Colin G. Cameron

at Defence R&D Canada

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Publications (4)

Proceedings Article | 5 March 2021 Presentation + Paper

Towards high-throughput light-activated drug discovery using automated plate illuminator

Robert Perttilä, John Roque, Lasse Orsila, Zoe Ylöniemi, Elias Kokko, Colin Cameron, Sherri McFarland, Petteri Uusimaa

Proceedings Volume 11628, 116280F (2021) https://doi.org/10.1117/12.2578408

KEYWORDS: Photodynamic therapy, Light-activated drugs, Fiber optic illuminators, Tissues, Tumors, Picosecond phenomena, Photochemistry, Lead, In vivo imaging

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Proceedings Article | 27 July 2004 Paper

Conductive filler: elastomer composites for Maxwell stress actuator applications

Colin Cameron, Royale Underhill, Marc Rawji, Jeffrey Szabo

Proceedings Volume 5385, (2004) https://doi.org/10.1117/12.539733

KEYWORDS: Composites, Actuators, Dielectrics, Electrodes, Polymers, Polyurethane, Particles, Polymeric actuators, Dielectric breakdown, Amplifiers

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Proceedings Article | 28 July 2003 Paper

Elastomeric composites with high-dielectric constant for use in Maxwell stress actuators

Jeffrey Szabo, Johnathan Hiltz, Colin Cameron, Royale Underhill, Jason Massey, Brian White, Jacob Leidner

Proceedings Volume 5051, (2003) https://doi.org/10.1117/12.484377

KEYWORDS: Dielectrics, Actuators, Composites, Polymers, Dielectric breakdown, Data modeling, Electrodes, Electroactive polymers, Ferroelectric materials, Particles

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Proceedings Article | 25 July 2003 Paper

Electrolytic phase transformation actuators

Colin Cameron, Michael Freund

Proceedings Volume 4878, (2003) https://doi.org/10.1117/12.520547

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The emerging field of materials-based actuation continues to be the focus of considerable research due to its inherent scalability and its promise to drive devices in ways that cannot be realized with conventional mechanical actuator strategies. Current approaches include electrochemically responsive conducting polymers, capacitance-driven carbon nanotubes actuators, pH responsive hydrogels, ionic polymer metal composites, electric field responsive elastomers, and field-driven electrostrictive polymers. However, simple electrochemical processes that lead to phase transformations, particularly from liquid to gas, have been virtually ignored. Although a few specialized applications have been proposed, the nature of the reactions and their implication for design, performance, and widespread applicability have not been addressed. Herein we report an electrolytic phase transformation (EPT) actuator, a device capable of producing strains surpassing 136,000% and stresses beyond 200 MPa. These performance characteristics are several orders of magnitude greater than those reported for other materials and could potentially compete with existing commercial hydraulic systems. Furthermore, unlike other materials-based systems that rely on bimorph structures to translate infinitesimally small volume changes into observable deflections, this device can direct all of its output towards linear motion. We show here that an unoptimized actuator prototype can produce volume and pressure changes close to the theoretically predicted values, with maximum stress (70 kPa) limited only by the mechanical strength of the apparatus. Expansion is very rapid and scales with applied current density. Retraction depends on the catalytic nature of the electrode, and state-of-the-art commercial fuel cell electrodes should allow rates surpassing 0.9 mL's^-1.cm^-2 and 370 kPa's^-1.cm^-2. We anticipate that this approach will provide a new direction for producing scalable, low-weight, high performance actuators that will be useful in a broad range of applications.

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