Nanostructured Materials Processing: Powders, Patterns & Pores 500nm Sundar V. Atre, Ph.D.
-
Upload
dylan-nichols -
Category
Documents
-
view
226 -
download
9
Transcript of Nanostructured Materials Processing: Powders, Patterns & Pores 500nm Sundar V. Atre, Ph.D.
Nanostructured Materials Processing: Powders, Patterns & Pores
500nm
500nm 500nm
Sundar V. Atre, Ph.D.
Research Overview
Microfeatures
Nanomaterials
Applicationsceramics, polymers, metals, composites
channels, pillars, wells sensors, medical, energy storage, packaging
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
Fluid Collection Cap
Diffusion Area
CNXL composite membranes CNXL composite membranes for improved selectivity and stiffnessfor improved selectivity and stiffness
Goran Jovanovic
John Simonsen
Sweda Noorani
US Patent 7955504 B1
Ceramic Nanoparticles: n-AlN
Valmika Nathan
Greg Purdy
Grant Kim(Powder Technology –submitted;
Powdermet 2010; NSTI Nanotech 2010)
AlN: Powder Injection Molding
shape
flow
debind
sinter
powder final
Powder Injection Molding International 2010; SME 2011; ABM 2011
AlN PIM: Sintering
1100 °C 1300 °C 1500 °C
µ-n
AlN
• Liquid phase formation was observed at 1500 °C
• n-Y2O3 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-A
lN500 °C 800 °C 1100 °C
Valmika Nathan
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
Si3N4 UAV Engines
Juergen LenzJOM, 2012
• Higher fuel efficiency at higher operating temperature
• Light weight
• Smaller component size: better fit with process and materials
PIM of Si3N4 Nanoparticles
Green Sintered
PIM: BaTiO3 Microwells
Valmika NathanPowder Injection Molding International 2011
Alternative: Green Micromachining
• Micromilling
a b
• Laser
Carl Wu
Valmika Nathan
Burak Ozdoganlar
Patterned Polymer Films
Valmika Nathan
Modified PVDF
Ceramic Nanoparticles: n-SiC
Plasma Pressure Compaction
dρ
ρ
Work
Master Sintering Curve
Microstructure
Armor
Electronic Packages
n-SiC: Microstructure-Properties
1600 1800 20000
8
16
24
Izhevskyi et al (5min, 1.5 MPa)Hilmas et al (1h, 25 MPa)Mulla et al (5min)Cao et al (1 h, 50 MPa)Tanaka et al (30 min)This Work (30 min, 20 MPa)
Har
dnes
s (G
Pa)
Sintering Temperature C)
1 μm
Manish Bothara, T. S. Sudarshan, Seong-Jin Park, Rand German
(Metallurgical & Materials Transactions, 2010, Science of Sintering 2011)
Pores: Anodization
200 nmA
C
B
Negar Monfared
ABM 2011
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
Pores: Biosensors
Nearly 5 Orders of MagnitudeIncrease In Performance
Shalini Prasad
Hypothesis: Macromolecular Crowding
20 nm
A
C
B
D
Integrating Length Scales
PAA functionalization: Langmuir 2011
Summary
500nm500nm 500nm
• Nano-structured materials: particles, patterns, pores
• Integration with microsystems
• Material systems: polymers, metals, ceramics
• Applications: energy, healthcare, homeland security, packaging