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Lecture 1 notes Nanomaterials: chemistry and fabrication (6E12X0) Concepts Of Nanochemistry $5.59   Add to cart

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Lecture 1 notes Nanomaterials: chemistry and fabrication (6E12X0) Concepts Of Nanochemistry

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This document contains the notes of the first lecture regarding Nanomaterials: chemistry and fabrication. This is the general introduction into nanotechnology and Nanomaterials. This lecture is based on the first chapter of the book “concepts of Nanomaterials”.

Last document update: 1 year ago

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  • May 15, 2023
  • May 15, 2023
  • 3
  • 2022/2023
  • Class notes
  • Albert schenning
  • Lecture 1
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OPA
④* *REEDID OFFFEINCONNOENGERSLIE
inanamescaterials:
what's

chemical substances or a re manufactured and used
materials that atthe nanoscale



created to exhibit novel characteristics (increased strength, chemical reactivity,

conductivity)

may pose risks to environment and raise health/safety concerns


many products already in use (batteries, coatings, anti-bacterial, etc.)

nano innovation effects many sectors:public health, employment, environment, etc.

Michael Faraday:

first
synthesis gold nanoparticles
of


discovered purple-red' gold
Richard Feynman

philosophical father nanotechnology
of


Feynman set challenges with $1000 prize

1. constructing a
tiny motor


2. fit encyclopedia britannia on the head of a pin

on the surface of things:

interface:surface that separates much larger volumes of

dissimilar substances

the assumption that there's no interface doesn't hold

for nanoparticles given the surface to volumeratio


(as shown on the right)
surface atoms possess dangling bonds

at corners / kinks/edges density of dangling

bonds increases


dangling bonds:bonds at surface when atoms have unfilled outer orbital (valence) shell


surface energy surface density dangling
of bonds x
energy of the bond

quantifies the disruption of intermolecular bonds that occur when a surface is created


depends on shape, roughness and chemical composition

higher surface energy makes a material less stable

surface pressure:pressure generated by surface energy

increases with increasing surface curvature

Laplace law:mathematical relation between spherical surface pressure, radius & surface energy

Ap 2(U(r)
=




to reduce surface energy, dangling bonds will react


size is everything.... Almost
nanochemistry falls between the classic and


quantum field (Inm-100nm)

different particles have different
optical

properties

Length of
synthesis reaction deter-


mine the particle size

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