PIEZOELECTRIC EFFECT (PIEZOELECTRIC
MATERIALS) & PHOTOMECHANICAL MATERIALS
Brown's Chemistry Revision Notes - Smart Materials and Materials Science
materials, effects etc. mentioned on these pages:
Materials Science INDEX *
Carbon fibres * Chromogenic
materials * Electrochromic materials
* Gore-Tex * Halochromic materials * High
performance polymers * Kevlar * Lycra *
Magnetic shape memory alloys * Magnetostrictive
materials * Nitinol *
pH sensitive polymers *
Photochromic materials *
Photomechancal materials * Piezoelectric
effect materials *
Self-healing materials * Shape
memory alloys *
Shape memory polymers * Spandex
* Temperature responsive polymers
* Thermochromic materials *
general survey of materials - natural & synthetic, their properties & uses
chemistry revision notes: basic school chemistry science GCSE chemistry, IGCSE chemistry, O level
& ~US grades 8, 9 and 10 school science courses or equivalent for ~14-16 year old
science students for national examinations in chemistry topics including uses
properties of smart materials
PIEZOELECTRIC EFFECT and PIEZOELECTRIC MATERIALS
Piezoelectric materials are
materials that produce a tiny voltage when stress is applied e.g. pressure by
compressing a material i.e. 'squeezing' it.
The electric polarising effect
is a direct result of mechanical stress on the crystal structure of the
Piezoelectric materials are most
widely used as sensors in different environments.
This piezo-electric effect can
be used to detect stress and deformation in solid materials.
The effect can used in general
to detect pressure changes in gases or liquids i.e. pressure transducers and
other electrical instrumentation components.
The piezoelectric effect is used
The effect can work in the
opposite way and an applied electric field (p.d. voltage) across the
material will produce stress within the
sample and cause it to change shape.
This reverse phenomenon is known
as the electrostrictive or motor effect.
Therefore structures can be
designed and made to bend, expand or contract when a voltage is applied for
a particular use.
PHOTOMECHANICAL MATERIALS are
involved in any process by which a printing surface is prepared mechanically
with the aid of photography.
Photomechanical materials can
change shape under exposure to light.
OP OF PAGE
INDEX of SMART MATERIALS PAGES
CHROMOGENIC MATERIALS - Thermochromic, Photochromic & Electrochromic Materials
SHAPE MEMORY ALLOYS e.g. Nitinol & Magnetic Shape Memory Alloys
SHAPE MEMORY POLYMERS, pH and temperature sensitive-responsive polymers,
performance polymers like KEVLAR
GORETEX, THINSULATE and TEFLON-PTFE
PIEZOELECTRIC EFFECT (PIEZOELECTRIC MATERIALS) and PHOTOMECHANICAL MATERIALS
See also INDEX
A general survey of materials - natural & synthetic,
their properties & uses
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