cellulose nanofiber
TRANSCRIPT
Cellulose Nanofiber / Nanocellulose
G. M. AhshanuzzamanStudent Id : 1105154th Year 1st TermForestry and Wood Technology DisciplineKhulna UniversityKhulna
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
Relationship between trees and cellulose Nanofiber
Trees are composed of wood fibers, which in turn are made of cellulose nanofibers, aggregations of cellulose molecules.
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
Properties of Nanofiber CompositeNanocellulose 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.
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
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
Future Inventions of Nanocomposite
Cars Transparent Cell-Phone Transparent LED-TV Transparent Watch Transparent Valuable
Ornaments Transparent panel Products Transparent hard-wares for
Computer