Unit 3 – The Chemistry of Engineering Materials Engineered Nanomaterials Flashcards
italicize
__________has attractive properties and amazing technological possibilities, which can be any one of the four basic types - metals, ceramics, polymers or composites.
nanomaterials
four basic types of nanomaterials
metals
ceramics
polymers
composites
fill in the blanks
The first – and broadest – definition of nanomaterials states that, these are materials where the sizes of the individual building blocks are less than _________ (a very small scale), at
least in one dimension (nm; equivalent to the diameter of approximately 500 atoms).
100 nm
The main difference between nanotechnology and conventional technologies is that the “bottom-up” approach is favored in _____________, whereas ____________
generally use the “top-down” approach.
nanotechnology
conventional technologies
nanotechnology uses what approach
bottom-up approach
conventional technologies use what approach
top-down approach
the expression _________ means starting from large pieces of material and producing the expected structure by mechanical or chemical methods.
top-down
__________ are produced via top-down processes, starting from bulk materials. The intended product is obtained by the application of mechanical and/or
chemical processes
Conventional goods
in “_________” processes where atoms or molecules are
used as the building blocks to produce nanoparticles, nanotubes, or nanorods, or thin films
or layered structures.
bottom-up
The
_______
starting with atoms and molecules as the building blocks that produced particles, nanotubes or nanorods and these products are also characterized
by their dimensionality.
bottom-up process
one-dimensional nanoparticles
nanotubes and nanorods
zero-dimensional structure
nanoparticles and fullerenes
two-dimensional
nanoplates (graphenes)
The _____________ of the diffraction pattern indicates that the direction of the platelets was perpendicular to the faces of the platelet;
hexagonal symmetry
In the formation of nanorods and nanoplates, the influence of
___________ is to be considered.
surface energy
At the circumference of each layer, the bonds are not saturated. The ___________ (short lines) need additional energy; thus, there is a strong tendency to saturate these bonds.
dangling bonds