nanocellulose in medicine and green manufacturing
TRANSCRIPT
Ruchica Kumar
Novocus Legal LLP
11/8/2016
Nanocellulose In Medicine and
Green Manufacturing
Nanocellulose Ruchica Kumar
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INTRODUCTION
Purpose of this document is to provide readers with a glimpse of recent developments in
technical sector of nanocellulose. We have compiled this document from reported facts and
our sources are also given herein.
We firmly believe that this would just be the beginning and there would be many more
applications possible of described technique. We are only reporting recent developments,
but you might be able to find a new application of the material described herein.
BACKGROUND
Nanocellulose 1 is a material derived from wood fibres. It has exceptional strength
characteristics on a par with Kevlar, a lightweight material used to manufacture high-strength,
durable materials. However, in contrast to Kevlar and other materials based on fossil fuels,
nanocellulose is completely renewable.
WHAT IS NANOCELLULOSE?
Nanocellulose (also called microfibrillated cellulose, MFC or nanofibrillated cellulose, NFC)
has been around since the early 1980s. It is produced by delaminating cellulosic fibres in high-
pressure homogenisers. Fully delaminated nanocellulose consists of long (1-2 micrometres)
microfibrils (5-20 nm in diameter) and has the appearance of a highly viscous, shear-thinning
transparent gel.
Commercialisation of nanocellulose failed to take off back in the 1980s because of the amount
of energy required (30,000 kWh/tonne) to delaminate fibres. Subsequent developments have
resulted in various fibre pre-treatment methods, by which energy consumption can be
reduced by up to 98 % (around 500 kWh/tonne).
APPLICATIONS FOR NANOCELLULOSE
There are a wide variety of potential applications for nanocellulose, including, for instance,
the manufacture of both paper and board. With regard to paper/board, nanocellulose could
1 http://www.innventia.com/en/Our-Expertise/New-materials/Nanocellulose/
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be used as a strengthening agent in paper with a high filler content. Other areas of application
may be surface sizing and coating, e.g. as a barrier material (against oxygen, water vapour,
grease/oil) in food packaging.
Then there are applications in the field of nanocomposites, non-caloric food thickeners,
emulsion/dispersion, oil recovery applications, cosmetic/pharmaceutical applications, and
applications in the electronics sector.
(MFC gel.)
NANOCELLULOSE IN MEDICINE AND GREEN MANUFACTURING
As introduced above, nanocellulose is one of the most abundant natural materials on earth.
What if you could harness its strength to lighten the heaviest of objects, to replace synthetic
materials, or use it in scaffolding to grow bone, in a fast-growing area of science in oral health
care2?
This all might be possible with cellulose nanocrystals, the molecular matter of all plant life. As
industrial filler material, they can be blended with plastics and other synthetics. They are as
strong as steel, tough as glass, lightweight, and green.
2 http://www.nanowerk.com/nanotechnology-news/newsid=44996.php
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"Plastics are currently reinforced with fillers made of steel, carbon, Kevlar, or glass. There is
an increasing demand in manufacturing for sustainable materials that are lightweight and
strong to replace these fillers," said Douglas M. Fox, associate professor of chemistry at
American University.
"Cellulose nanocrystals are an environmentally friendly filler. If there comes a time that
they're used widely in manufacturing, cellulose nanocrystals will lessen the weight of
materials, which will reduce energy."
(Dental follicle stem cells cultured on different scaffolds for 10, 20 and 30 days. Alizarin red
stain was used to detect stem cell mineralization (the red indicates the bone mineralization).
Bone differentiation rate of cells on the cellulose-nanocrystal scaffold was faster compared to
the bioplastics scaffold. (Image: Martin Chiang, National Institute of Standards and
Technology)
Fox has submitted a patent for his work with cellulose nanocrystals, which involves a simple,
scalable method to improve their performance. Fox's method could be used as a biomaterial
and for applications in transportation, infrastructure and wind turbines.
THE POWER OF CELLULOSE
Cellulose gives stems, leaves and other organic material in the natural world their strength.
That strength already has been harnessed for use in many commercial materials. At the nano-
level, cellulose fibres can be broken down into tiny crystals, particles smaller than ten
millionths of a meter. Deriving cellulose from natural sources such as wood, tunicate (ocean-
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dwelling sea cucumbers) and certain kinds of bacteria, researchers prepare crystals of
different sizes and strengths. For all of the industry potential, hurdles abound. As
nanocellulose disperses within plastic, scientists must find the sweet spot: the right amount
of nanoparticle-matrix interaction that yields the strongest, lightest property. Fox overcame
four main barriers by altering the surface chemistry of nanocrystals with a simple process of
ion exchange. Ion exchange reduces water absorption (cellulose composites lose their
strength if they absorb water); increases the temperature at which the nanocrystals
decompose (needed to blend with plastics); reduces clumping; and improves re-dispersal
after the crystals dry.
CELL GROWTH
Cellulose nanocrystals as a biomaterial is yet another commercial prospect. In dental
regenerative medicine, restoring sufficient bone volume is needed to support a patient's
teeth or dental implants. Researchers at the National Institute of Standards and Technology,
through an agreement with the National Institute of Dental and Craniofacial Research of the
National Institutes of Health, are looking for an improved clinical approach that would regrow
a patient's bone. When researchers experimented with Fox's modified nanocrystals, they
were able to disperse the nanocrystals in scaffolds for dental regenerative medicine purposes.
"When we cultivated cells on the cellulose nanocrystal-based scaffolds, preliminary results
showed remarkable potential of the scaffolds for both their mechanical properties and the
biological response. This suggests that scaffolds with appropriate cellulose nanocrystal
concentrations are a promising approach for bone regeneration," said Martin Chiang, team
leader for NIST's Biomaterials for Oral Health Project. Another collaboration Fox has is with
Georgia Institute of Technology and Owens Corning, a company specializing in fiberglass
insulation and composites, to research the benefits to replace glass-reinforced plastic used in
airplanes, cars and wind turbines. He also is working with Vireo Advisors and NIST to
characterize the health and safety of cellulose nanocrystals and nanofibers. "As we continue
to show these nanomaterials are safe, and make it easier to disperse them into a variety of
materials, we get closer to utilizing nature's chemically resistant, strong, and most abundant
polymer in everyday products," Fox said.