Nano technology in textiles. seminar. pptx
The application of nanotechnology in textiles is growing so fast. The main difference b/n nano finishing and convectional finishing is durability, comfort and breath-ability enhancement in nano finishes.
Published on: Mar 3, 2016
Transcripts - Nano technology in textiles. seminar. pptx
Bahir Dar University
Nano-Technology application in Textiles
By: Bademaw Abate
The design, characterization, production and application of
structures, devices and systems by controlling shape and size of
building blocks at the nanometer scale.
The study of control of matter on an atomic and molecular scale.
Involves engineering on a small scale to create smaller, cheaper,
lighter, and faster devices that can do more things with less raw
How small is Nano
Units in nanometers (nm) : 1nm= 10-9m
3 types of nanotechnology in textiles can be
Nanotechnology in fibres and yarns (fabrics)
Nanotechnology in coatings (textile finishing)
What is a Nanofiber?
A nanofiber is a continuous fiber which has a
diameter in the range of billionths of a meter.
The smallest Nano fibers made today are between
1.5 and 1.75 nanometers
Nanoscale materials can be rationally designed to
exhibit novel and significantly improved physical,
chemical and biological properties, because of their
Nonwoven fabrics composed of electro spun
nanofibres have :
a large specific surface area,
a high porosity
a small pore size in comparison with commercial
textiles making them excellent candidates for use in
filtration, medical and membrane applications.
Dramatic change in properties of a substance when
particle size reduced to nanometer range
Normal ceramic particle Brittle
Nano ceramic particle Deformable, flexible
Normal Gold Yellow
Nano gold Red
Nanotechnology has real commercial potential for the
textile industry. Why?
conventional methods used to impart different properties to
will lose their functions after several laundering or wearing.
Nanotechnology can provide high durability for fabrics
nano-particles have a large surface area-to-volume ratio
high surface energy.
Coating of nano-particles on fabrics will not affect their
breathability or hand feel.
Different structures of Nano Particles…
The whiskers get hooked on the fibers to alter the fabric property.
Nano Whiskers can make the fabric
stain & water resistant…
Nano whiskers can keep the fabric breathable too unlike resins
Value addition due to Nano Whiskers…
Water and oil repellency
Fabric remains soft, natural
Three Dimensional Molecular Nano Net covers the core
Value addition due to Nano Net…
• Alters the property of synthetic fibers like
Polyester to give a feel of cotton & linen.
• Wicks body moisture fast
• Dries quickly & gives the cooling effect.
Nano sheet wraps the fiber completely to cover it & alter its
Nano wraps can enhance the fabric Wash
Normal fabric trouser with out nano
wrap on the fibers after 50 washes!
Trouser made up fabric with nano
wrap fibers after 50 washes!
Value addition due to Nano Wrap
Strength and Durability
Improvement in colorfastness
Some Magic Nano Particles…
Clay Nano Particles
ZnO Nano Particles
TiO2 Nano Particles
MgO Nano Particles
Silver Nano Particles
Textile Applications of Nano Technology...
Integration of nanoparticles in textiles
Nanoparticles can be introduced in the textile
production process at two levels :
during the melt extrusion of yarns
nanoparticles based on clay, metal oxides or carbon nanotubes (CNTs) can be
mixed in the polymer before the extrusion step.
This allows new functionalities to be incorporated
during the coating.
The fabric is padded and dried.
During drying water evaporates.
During subsequent curing operation the polymers
melt and spread giving uniform coating of fibres
due to nano size of the finishing agent.
Antibacterial and Deodorant finishes
based on nanotechnology
Typical example: when human body perspire the
clothing in contact with skin such as socks, shirts etc
smell due to growth of bacteria.
This drawback is eliminated by Ag fresh finish
incorporate silver particles in a size of around 4nm
A material of superior antibacterial, deodorant
properties with good laundering fastness has been
brought about by letting silver particles penetrate
into the fiber itself.
Ag nanoparticle penetration in fibre
The metal ions catalyze the production of oxygen radicals that oxidize molecular
structure of bacteria.
The 'Ag fresh' antibacterial, deodorant finish has
been developed for use mainly in
garments worn close to the skin,
Further applications of this technology are being
planned for use in uniforms, casual wear, shirts,
bedding, nightwear, underwear, polo shirts.
Self cleaning clothes
Titanium dioxide nanoparticles are catalysts that help break down carbon-
Require only sunlight to trigger the reaction
The inventors believe that these fabrics could be made into self-cleaning
clothes that tackle dirt, environmental pollutants and harmful
The titanium dioxide particles covering the fibres are 20 nm size
Water Repellent and Self Cleaning
Hydrophobic finishes lower the surface energy and can give a
maximum water contact angle of roughly 120 degree.
To get higher contact angle and to have the self-cleaning ability,
Surfaces with contact angle between 150 to 180 degree are required
SiO2, Al2O3 nanoparticles
are mainly used for super
water repellent finishes.
Smart/interactive textiles (SIT) are materials and structures that sense and react
to environmental conditions or stimuli, such as those from mechanical, thermal,
chemical, electrical, magnetic or other sources.
The sensors provide a nerve
system to detect signals
The processor analyzes and
evaluates the signals
The actuators act upon the detected
and evaluated signal either directly or
from a central control unit
Applications of Nanotechnology In Military
Military uniforms that change color to match the
Light weight bullet-proof vests
Applications of Nanotechnology
• Stain/odor-free clothing & carpet
• Bug-repellant clothing
• Military uniforms that change color to match
• Light weight bullet-proof vests
• Clothing that scans your body for a perfect fit
Global Positioning System-GPS
Textiles integrated with sensory devices driven by a GPS can
detect a user’s exact location anytime and in any weather.
Interactive electronic textiles with integrated GPS enhance
safety by quickly locating the wearer and allowing the suit to
GPS can provide added safety for firefighters and emergency
personnel by facilitating offsite monitoring of vitals.
A combination of sensors and small flexible light emitting displays
(FLED) can receive and respond to stimuli from the body, enabling a
warning signal to be displayed or sent.
The sensors can monitor heart rate, respiration, and temperature.
If vital signals were below critical values, a FLED would automatically
display, for example, a flashing red light, and a wireless communication
system could send a distress signal to a remote location.
With a hope for great success of Nano
Technology in Textiles …