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Nano scale phase change materials pcms and

Research Energy transport and conversion processes occur at the nanoscale due to interactions between molecules, electrons, phonons, and photons. We experimentally study these processes using laser based metrology. Our goal is to apply our understanding to improve technologies in energy, nanoelectronics, and cryotechnology. Energy Heat dissipation in solid state lighting: LEDs will replace incandescent and flourescent lights, but their efficiency, durability, and performance is inhibited by high operating temperature.

Bockstaller and Chemistry K. Matyjaszewskias well as researchers at Osram Sylvaniawe are developing new high thermal conductivity polymers that improve heat dissipation without degrading optical performance.

Phase-change material

Novel organic-inorganic hybrid materials for energy applications: Organic-Inorganic hybrid materials are a new class of materials assembled from organic and inorganic building blocks 1-10nm in size. Scalable solution-based-manufacturing makes hybrids an attractive alternative to costly single crystal semiconductors for LEDs, photovoltaics, and thermoelectrics, where thermal transport is key. In NSF funded collaborations with D.

Talapin at University of Chicago and X.

Roy at Columbia Universitywe are trying to learn how thermal energy traverses this unique hard-soft vibrational landscape? Phase change materials PCMs store thermal energy to help intermittent energy sources meet steady demands. For example, PCMs are critical to solar thermal energy conversion.

  1. Currently, there is a gap in the research knowledge concerning the effectiveness of the available passive thermal regulation techniques for BICPV, both individually and working in tandem. Previous article in issue.
  2. Abstract Building-Integrated Concentrated Photovoltaics BICPV is based on Photovoltaic PV technology which experience a loss in their electrical efficiency with an increase in temperature that may also lead to their permanent degradation over time.
  3. A designed and fabricated, scaled-down thermal system was attached to the electrical heaters to mimic the temperature profile of the BICPV. This research can contribute to bridging the existing gaps in research and development of thermal regulation of BICPV and it is envisaged that the realised incremental improvement can be a potential solution to a their performance improvement and b longer life, thereby contributing to the environmental benefits.

The success of PCMs hinges upon their ability to be charged discharged at suitably fast rates to keep pace with dynamic loads. We are developing 3D metal meshes that can be inserted into PCMs to enhance their thermal conductivity and charge discharge rates. Meniscus evaporation controls ubiquitous industrial processes including heterogeneous bubble nucleation in boiling, desalination systems, thin film coating, and lubrication.

We seek to understand evaporative heat transfer rates in the nanoscale thin film region of the meniscus where continuum behaviors cease to exist. Heat is focused onto the magnetic media with a near field transducer NFT that propogates light along a nanoscale plasmonic interface.

Parasitic dissipation in the NFT itself rather than in the media causes heat fluxes at the plasmonic interface that are 100 times as high as at the surface of the sun. RRAM offers benefits to nonvolatile memory systems due to scalability, fast switching, and easy fabrication.

In RRAM, electrical stimulation switches the resistance of a metal-insulator-metal memory cell. A low-resistance state is achieved during the set process, when a nanoscale conductive filament CFformed by dielectric breakdown in the insulator, bridges the metal contacts.

Nanoconfined phase change materials for thermal energy applications

During the reset process, joule heating disrupts the CF and restores the device to a high-resistance state. Through Boltzmann Transport Equation models and thermoreflectance measurements see image that uniquely expose phonon properties, we seek to understand how these nondiffusive i. Cryotechnology Thermal conductivity of cryoprotective agents CPAs: Cryopreservation is the preservation of biomaterials at low temperatures through the suspension of mass transport.

Ice crystal formation during freezing can destroy cells, so organs are perfused with viscous CPAs that forms a stable glassy i. In an NIH funded collaboration led by Y. Rabin we are measuring thermal conductivity differences between crystalline and glassy CPAs that impact cryoprotocals.