Mechanical Behavior of Integrated Polymer Nanocomposites. 65 wt%, Fe 2 O 3 /PU. SiC/PU. Co. THF. + Co +2. + KAuCl 4. 25 wt%, Fe 2 O 3 /VE. @10 K. V. V. Co. ASTM D412 Head Cross Speed: 15mm/min. Au. SiC-PU more strengthened. Functionalization effect: increased strength.
65 wt%, Fe2O3/PU
25 wt%, Fe2O3/VE
Magnetic Behavior of Integrated Polymer Nanocomposites
Microstructure of Integrated Polymer Nanocomposites
TEM Micrograph (450 oC)
65 wt%, Fe2O3/PU
CIP 5 um
Particulate Magnetic Nanocomposites for Electronic Device Applications
Zhanhu Guo and H. Thomas Hahn
Multifunctional Composites Lab, Mechanical & Aerospace Engineering Department and Materials Science & Engineering Department
University of California Los Angeles, Los Angeles, CA 90095, USA
Polymeric composites reinforced with inorganic fillers have attracted much interest due to their reduced weight, high homogeneity, cost-effective processability and tunable physical such as mechanical, magnetic, optical, electric and electronic properties. The applications have extended into the marine (Naval submarine) and airplane (Boeing 787) industries. Furthermore,
Particulate Co-Au Nanocomposite Application: GMR Sensor
Furthermore, nanoparticles (NPs) within the polymeric matrix render the nanocomposite potential electronic device applications such as fuel cells, photovoltaic (solar) cells, batteries and magnetic data storage. On the other side, the functional groups of the polymer surrounding the nanoparticles enable these polymer nanocomposites suitable for variable applications such as site-specific molecule targeting application in the biomedical areas.
Particle dispersion together with the interaction between fillers and polymer matrix are major challenges in the polymer composite manufacturing. The particle agglomerates and voids resulting from the poor bondage will serve as defect generating a deleterious physical properties such as lower tensile strength for structural material application and poorer electron transport path for integrated polymer composite electric/electronic device applications.
We have demonstrated strengthened polymer nanocomposite fabrication by surface engineering the particles. However, functionalization is an extra cost for production with high particle loading. We developed several simple and low-cost methods (surface-initiated-polymerization, monomer stabilization method, and solvent-extraction approach).
Polymer nanocomposites were developed into a granular giant magnetoresistance (GMR) sensor with the highest signal among these systems. Compared with metallic matrix GMR, the polymer matrix could be facile fabrication, low-cost usage without any packaging requirement and suitable for harsh environmental applications, ready to be used in specific biomedical areas.
Microwave absorber were built up from the polymer nanocomposites. The device shows weight reduction and fairly well performance.
GMR Sensor Application
Nanocomposite Fabrication Methodology
Advantage of Polymer Nanocomposite Sensor
Chemical structure of (A) styrene (B) vinyl ester monomer
Particulate Polymer Nanocomposite Application: Microwave Absorber
Microwave absorber dimensions
outer diameter: 7.00 mm
inner diameter: 3.04 mm
Particulate Nanocomposite Application: GMR Sensor
Z: impedance; d: thickness
λ: wavelength in free space
MBRL: metal back reflection loss
Bold line: real
Thin line: imaginary
anti-parallel: high R
parallel: low R
catalyst + promoter + ultrasoincation nanoparticle activation
Monomer serves as a surfactant
R(0) and R(H): resistance at zero and any applied field H.