Nanofibers from cellulose

1. Cellulose Nanofiber / Nanocellulose
G. M. Ahshanuzzaman
Student Id : 110515
4th Year 1st Term
Forestry and Wood Technology Discipline
Khulna University
Khulna

2. Cellulose Nanofiber(CNF) is made from wood-derived fiber (pulp) that has been
micro-refined to the nano level of several hundredths of a micron and smaller.
As the material is derived from plant fibers,
Cellulose Nanofiber
Cellulose nanofiber is the world's most advanced biomass
material. It creates low environmental impact in its production
and disposal

3. Relationship between trees and cellulose Nanofiber
Trees are composed of wood fibers, which in turn are made of cellulose
nanofibers, aggregations of cellulose molecules.

4.  Light and strong
 Ultra-fine fibers (fiber width: about 3 nm)
 Large specific surface area
 Low thermal expansion
 High gas barrier properties
 Environmentally-friendly biomass material
 Renewable resource and broad availability
 Low density and high strength compared
with inorganic fillers
Characteristics of Nanofiber Composite

5. Properties of Nanofiber Composite
Nanocellulose dimensions and crystallinity
They consist cellulose nanofibrils and nanofibril bundles. Typical values
for the degree of crystallinity around 63%.
Viscosity
The high viscosity at low nanocellulose concentrations makes
nanocellulose very interesting as a non-caloric stabilizer and gellant in
food applications,
Barrier properties
In semi-crystalline polymers, the crystalline regions are considered to be
gas impermeable. Due to relatively high crystallinity (high cohesive
energy density) it has been suggested that nanocellulose might act as a
barrier material.

6.  The modulus of elasticity has the same level of strength as that of
aramid fiber, which is known as a high-strength fiber,
 Thermal expansion on par with glass.
 Its tensile strength is about 500MPa
 Its stiffness is about 140–220 Gpa
 Films made from nanocellulose have high strength (over 200 MPa),
 High stiffness (around 20 GPa) and high strain
 Its strength/weight ratio is 8 times that of stainless steel.
Mechanical Properties

7. Applications of Nanofibers and Nanocomposites
 Paper and paperboard
 Composite
 Regenerated cellulose products, such as fibers films, cellulose derivatives
 Tobacco filter additive
 Organometallic modified nanocellulose in battery separators
 Reinforcement of conductive materials
 Loud-speaker membranes
 High-flux membranes
 Flexible electronic displays
 Computer components
 Lightweight body armour and ballistic glass

8. Future Inventions of Nanocomposite
 Cars
 Transparent Cell-Phone
 Transparent LED-TV
 Transparent Watch
 Transparent Valuable
Ornaments
 Transparent panel Products
 Transparent hard-wares for
Computer