1 Cutting it down to size activity. What is Nanoscience? The study of matter on the “nanometer” scale. A nanometer is one billionth (10 –9 ) of a meter.

1

Cutting it down to size activity

What is Nanoscience?

The study of matter on the “nanometer” scale.A nanometer is one billionth (10–9) of a meter.

Nanoparticles are usually between 1 and 100 nanometers in size: 1 – 100 nm.

2

cm mm m nm

10-2 10-3 10-610-4 10-5 10-7 10-8 10-9(m)

Hair100 m

Penny2 cm

Raindrop1 mm

Red Blood Cell5 m

3

4

5

Calculating the number of molecules along the edge of a sugar cube activity

6

7

Measuring the diameter of a human hair activity

Material Measurement Laboratory

Soft Body Armor Toward

the Nano-Effect

Gale A. HolmesNational Institute of Standards & Technology

Materials Measurement Laboratory8

Material Measurement Laboratory

9

Soft Body Armor: Primary Functions

•Stop Projectile Motion – Trampoline Effect

•Minimize Energy Dissipation of Impacting Projectile –Back Face Signature

Material Measurement Laboratory

10

Effects of the Shear Thickening Fluid (STF) on the body armor application

Wedge through phenomenon Tensile machine

Kolsky bar

100 101 102 103

Silica particles, 55-65 Vol.% in PEG

Material Measurement Laboratory

11

SEM Micrographs of Woven Fabrics with Shear Thickening Fluid (STF)

Material Measurement Laboratory

12

Effects of the Shear Thickening Fluid (STF) on Back Face Deformation

13

1) Coffee cup AFM 2) Magnetic force microscope

Atomic Force Microscopy (AFM)

How an atomic force microscope “see” atoms

14

Scanning Tunneling Microscopy (STM)

Nano-corral of 48 iron atoms on copper surface positioned one at a time with an STM tip Corral diameter 14 nm

An STM image of nanoparticles.

15