research

Minoru Tomozawa

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Teaser: 
is pioneering innovations in glass science.
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Minoru Tomozawa

Research Highlights Link med

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A sampling of ongoing research projects from the department.
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research highlights

Laser fabricated micro-/nanostructures

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While others have used "Pulsed laser ablation in liquid" to produce nanoparticles for ten years, researchers at Rensselaer found for the first time that this approach could lead to more interesting structures. It was surprising to find hollow spheres and nanowires in the products fabricated by pulsed laser ablation of an aluminum target immersed in liquid. This technique has been used by other researchers for ten years in producing nanoparticles, but such structures were never observed before.

 While others have used "Pulsed laser ablation in liquid" to produce nanoparticles for ten years, researchers at Rensselaer found for the first time that this approach could lead to more interesting structures.  It was surprising to find hollow spheres and nanowires in the products fabricated by pulsed laser ablation of an aluminum target immersed in liquid.

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Laser fabricated nanostructures

Order of Magnitude Improvement in Fatigue Performance of Nanoscale Alumina Filled Epoxy

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Novel nanoscale alumina particle filled epoxy nanocomposites were designed and developed for potential use in electrical machine insulation. One of the potential advantages of nanoparticle filled thermosets is the unique combination of mechanical properties that can be obtained.

Novel nanoscale alumina particle filled epoxy nanocomposites were designed and developed for potential use in electrical machine insulation. One of the potential advantages of nanoparticle filled thermosets is the unique combination of mechanical properties that can be obtained.

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Nanoparticle Filled Thermosets

High Aspect Ratio BaTiO3 leads to Enhanced Dielectric Constant / Low Loss Composites.

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High aspect ratio BaTiO3 fibers were synthesized to improve the dielectric constant of composites compared to spherical fillers while maintaining a low dielectic loss. The fibers are more efficient than spherical fillers and could be used as field grading materials in high voltage cable transmission lines.

High aspect ratio BaTiO3 fibers were synthesized to improve the dielectric constant of composites compared to spherical fillers while maintaining a low dielectic loss. The fibers are more efficient than spherical fillers and could be used as field grading materials in high voltage cable transmission lines.  

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Enhanced Dielectric Constant

Nanorockets Propelled by Catalytic Chemical Reactions

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Nanorockets
Teaser: 
Rocket engines have been around for centuries and have carried humans to moon. The same propulsion principle is in fact applicable at the nanoscale. Nanostructures can propel themselves by burning the surround fuels, as shown by molecular simulations.

Rocket engines have been around for centuries and have carried humans to moon. The same propulsion principle is in fact applicable at the nanoscale. Nanostructures can propel themselves by burning the surround fuels, as shown by molecular simulations. 

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Self-propelling nanorockets

Photoactive acenes for organic photovoltaics (OPVs)

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By designing the interaction between metal substrates and the first layer of molecules, acenes can be packed in a face-to-face fashion instead of the conventional herringbone (face-to-edge) arrangement. Absorption spectra of cofacially packed acenes have a better overlap with the solar spectrum, which allows harvesting more of the solar energy from red photons.

 

By designing the interaction between metal substrates and the first layer of molecules, acenes can be packed in a face-to-face fashion instead of the conventional herringbone (face-to-edge) arrangement. Absorption spectra of cofacially packed acenes have a better overlap with the solar spectrum, which allows harvesting more of the solar energy from red photons.

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Photoactive acenes for OPVs

Anisotropic self-assembly of spherical polymer-grafted nanoparticles

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It is easy to understand the self-assembly of particles with anisotropic shapes or interactions (for example, cobalt nanoparticles or proteins) into highly extended structures. However, there is no experimentally established strategy for creating a range of anisotropic structures from common spherical nanoparticles. We demonstrate that spherical nanoparticles uniformly grafted with macromolecules ('nanoparticle amphiphiles') robustly self-assemble into a variety of anisotropic superstructures when they are dispersed in the corresponding homopolymer matrix.

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Anisotropic
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Self-Assembly of Nanoparticles

Photo/beta-voltaic Diodes

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Due to unique electronic properties and the unusual quality of self-healing of radiation damage (i.e., radiation hardness), boron carbide based semiconductors have been fabricated to form photo/beta-voltaic diodes which can be used for power harvesting and sensing applications.

Due to unique electronic properties and the unusual quality of self-healing of radiation damage (i.e., radiation hardness), boron carbide based semiconductors have been fabricated to form photo/beta-voltaic diodes which can be used for power harvesting and sensing applications.

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Photo/beta-voltaic Diodes

Crack Resistant Glass

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Cracking behavior of various glasses under a 1 kilogram force load. a.) normal glass, b.) intermediate glass, c.) anomalous glass Vickers indentations under 1 kg load are shown. While many glasses exhibit extensive cracking, (a) and (c), new glass did not, (b). When a glass exhibits permanent deformation, it assumes a higher temperature structure. The cracking appears related to the changes of the glass properties associated with the higher temperature structure.

Cracking behavior of various glasses under a 1 kilogram force load.   a.) normal glass,  b.) intermediate glass, c.) anomalous glass  Vickers indentations under 1 kg load are shown. While many glasses exhibit extensive cracking, (a) and (c), new glass did not, (b). When a glass exhibits permanent deformation, it assumes a higher temperature structure.

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Crack Resistant Glass