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Nanostructured Materials Processing: Powders, Patterns & Pores 500nm Sundar V. Atre, Ph.D.
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Research Overview Microfeatures Nanomaterials Applications ceramics, polymers, metals, composites channels, pillars, wellssensors, medical, energy storage, packaging
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Cellulose Nanocrystals-CNXLs Top one-side plate Film Two-side plate Film Two-side plate Film Two-side plate Top Support Plate Bottom one-side plate Film Bottom Support Plate Fluid Collection Cap Diffusion Area CNXL composite membranes for improved selectivity and stiffness Goran Jovanovic John Simonsen Sweda Noorani US Patent 7955504 B1
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Ceramic Nanoparticles: n-AlN Valmika Nathan Greg Purdy Grant Kim (Powder Technology –submitted; Powdermet 2010; NSTI Nanotech 2010)
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AlN: Powder Injection Molding shape flow debind sinter powder final Powder Injection Molding International 2010; SME 2011; ABM 2011
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AlN PIM: Sintering 1100 °C1300 °C1500 °C µ-n AlN Liquid phase formation was observed at 1500 °C n-Y 2 O 3 and n-AlN lead to liquid phase formation at lower temperatures (100 °C lower than prior reports) Nanorod formation was observed at 1100 °C for monomodal µ-AlN 500 °C µ-AlN 500 °C800 °C1100 °C Valmika Nathan
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AlN PIM: Sintering Higher initial solids loading lead to lower shrinkage for bimodal sample (14±1%) than the conventional monomodal ones (>20%) (c) 1650 °C Ceramics International 2012 Valmika Nathan
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Si 3 N 4 UAV Engines Juergen Lenz JOM, 2012 Higher fuel efficiency at higher operating temperature Light weight Smaller component size: better fit with process and materials
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PIM of Si 3 N 4 Nanoparticles
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Green Sintered PIM: BaTiO 3 Microwells Valmika Nathan Powder Injection Molding International 2011
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Alternative: Green Micromachining Micromilling ab Laser Carl Wu Valmika Nathan Burak Ozdoganlar
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Patterned Polymer Films Valmika Nathan Modified PVDF
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Ceramic Nanoparticles: n-SiC Plasma Pressure Compaction dρρdρρ Work Master Sintering Curve Microstructure Armor Electronic Packages
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n-SiC: Microstructure-Properties 1 μm Manish Bothara, T. S. Sudarshan, Seong-Jin Park, Rand German (Metallurgical & Materials Transactions, 2010, Science of Sintering 2011)
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Pores: Anodization 200 nm A C B Negar Monfared ABM 2011
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Pores: Nanorod Templates Negar Monfared PUSZ, 9 hr UV curing, 2 hr thermal curing at 600 ° C (1.2°C/min), pyrolysis at 1100°C (1.2°C/min) PUSZ, 5 minutes vacuum, 5 hr UV, no thermal curing, pyrolysis for 2 hr at 1100°C (5°C/min) Polyurea silazane (PUSZ) ABM 2012
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Pores: Biosensors Nearly 5 Orders of Magnitude Increase In Performance Shalini Prasad
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Hypothesis: Macromolecular Crowding 20 nm A C B D
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Integrating Length Scales PAA functionalization: Langmuir 2011
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Summary 500nm Nano-structured materials: particles, patterns, pores Integration with microsystems Material systems: polymers, metals, ceramics Applications: energy, healthcare, homeland security, packaging
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