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Large-scale utilization of solar-energy resources will require considerable advances in energy-storage technologies to meet ever-increasing global energy demands. Other than liquid fuels, existing energy-storage materials do not provide the requisite combination of high energy density, high stability, easy handling, transportability and low cost. New hybrid(More)
Nanoporous silicon (NPSi) has received significant attention for its potential to contribute to a large number of applications, but has not yet been extensively implemented because of the inability of current state-of-the-art nanofabrication techniques to achieve sufficiently small pore size, high aspect ratio, and process scalability. In this work we(More)
The evolution of the electronic absorption edge of type I, II and III kerogen is studied by diffuse reflectance UV–Visible absorption spectroscopy. The functional form of the electronic absorption edge for all kerogens measured is in excellent agreement with the ''Urbach tail'' phenomenology. The Urbach decay width extracted from the exponential fit within(More)
We formulate, solve computationally and study experimentally the problem of collecting solar energy in three dimensions. We demonstrate that absorbers and reflectors can be combined in the absence of sun tracking to build three-dimensional photovoltaic (3DPV) structures that can generate measured energy densities (energy per base area, kWh/m 2) higher by a(More)
This article is dedicated in honor of Dr. Hamlin Jennings, our esteemed colleague in cement chemistry who provided comment on this work and sadly passed just after its acceptance. His enthusiastic efforts to bring a materials science perspective to cement research will be long valued. The initial microscale mechanisms and materials interfacial process(More)
Rapid, non-destructive characterization of molecular level chemistry for organic matter (OM) is experimentally challenging. Raman spectroscopy is one of the most widely used techniques for non-destructive chemical characterization, although it currently does not provide detailed identification of molecular components in OM, due to the combination of(More)
The current mechanism for defrosting automobile front windshields is using waste heat from the engine to heat the windshield via convection, an inefficient process taking up 30 minutes. A new de-icing system using a transparent thin film from a templated solar thermal fuel could rapidly de-ice a windshield using stored solar energy. As a step towards(More)