Lecture 3

chichi's version from 2018-02-26 20:16

Section 1

Question Answer
Applications of nanotechnologyautomotive industry, chemical industry, engineering, electronic industry, construction, medicine, textile/fabrics/non-wovens, energy, cosmetics, food and drinks, household, sports/outdoor
automotive industrylightweight construction, painting (fillers, base coat clear coat), catalysts, tires (fillers), sensors, coatings for windscreen and car bodies
chemical industryfillers for paint systems, coating systems based on nanocomposites, impreganation of papers, switchable adhesives, magnetic fluids
engineeringwear proctection for tools and machines (anti blocking coatings, scratch resistant coatings on plastic parts, etc.), lubricant-free bearings
electronic industrydata memory (MRAM), displays (OLED), laser diodes, glass fibres, optical switches, filters (IR-blocking), conductive , antistatic coatings
constructionconstruction materials, thermal insulation, flame retardants, surface-functionalized building materials for wood, floors, stone, facades, tiles, roof tiles, etc., facade coatings, groove mortar
medicinedrug delivery systems, active agents, constrast medium, meical rapid tests, protheses and implants, antimicrobial agents and coatings, agents in cancer therapy
textile/fabrics/non-wovenssurface-processed textiles, smart clothes
energyfuel cells, solar cells, batteries, capacitors
cosmeticssun protection, lipsticks, skin creams, tooth paste
food and drinkspacakage materials, storage life sensors, additives, clarifacication of fruit juices
householdceramics coatings for irons, odors catalyst, cleaner for glass, ceramic, floor, windows
sports/outdoorski wax, antifogging of glasses/goggles, antifouling coatings for ships/boats, reinforced tennis rackets and balls

Section 2

Question Answer
Classification of nanostructed materials from the point of view of nanostructure:dimensions, morphology, comoposition, uniformity & agglomeration state
dimensionality:1D, 2D, 3D
1 D nanomaterialsthin films or surface coatings they do not pose health risks
2 D nanomaterialsfixed long nanostructures, thick membraines with nanopores, free long aspect ratio nanowires
3 D nanomaterialsfixed small nanostructures, membranes with nanopores, free small ascpect ratio nanopartices
morphology: high-aspect ratio and low aspect ratio
high aspect rationanowires, nanohelicies, nanozigzags, nanopillars, nanotubes, nanobelts
low-aspect rationanospherical, nanohelices, nanopillars, nanowires, nanopyramids, nanocubes,
composition:single material, composites
single materialcompact, hollow (spherical or nanotubes)
compositescoated, encapsulated, barcode, mixed
uniformity & agglomeration stateismoetric and inhomogenenous

Section 3

Question Answer
Nanodotsparticles deposited on the surfaces or in th bulk of host material
How are nanodots produced?they produced by self-assembly of atoms on surface in the bulk
Applications of nanodotssemiconductors & metal oxides, supported catalysis and sensors, optical ane electronic and magnetic deviecs for lasers
Quantum dota sufficiently small dot with sufficiently deep localizing potential that produces quantum electron confinement
Nanowireswires of diameters in the nm range (few to 100 nm or more), made of varieties of materials and have important structural, thermal elctronic, optical, and magnetic characteristics.
Examples of nanowiresmetal nanowires, ceramic nanowires, semiconductor nanowires
Technique of producing nanowires:evaporation-condensation, vapro-liquid-solid (VLS), Solid-liquid-vapor (SLV), stress-driven recrystallization
Why we need nano rods/wires?limitation of nanospheres

Section 4

Question Answer
VLS Method (STEP 1)a liquid droplet of catalyst captures the growth species from vapor phase
VLS Method (STEP 2)it deposites that species first on the substrate to nucleate the wire, then continues to drive the 1D growth of wire by depositing more of the wire species
What is VLS method famous for?It's a famous growth mechanism of nanowires of silicon and other materials
What makes VLS method goodIt makes it easier to control the composition and growht speed. The diameter can be controlled by controlling the size of the catalyst droplets. Wires have uniform cross section, and are made of single crystals
Applications of nanowriesbiological applications: detecting viruses and cancers, photon source and detectors, lasers and opto-electronic devies

Section 5

Question Answer
What's the most studied nanotubestructures?carbon nanotubes
Carbon nanotubes have important...electronic, thermal, and mechanical properties
CNTs electronic applicationsdevices
CNTs mechanical applicationsreinforcement in composites

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