Researchers from NUS turn paper waste into ultralight super material that improves oil spill cleaning and heat insulation

PR63285

SINGAPORE, Feb. 3, 2016 /PRNewswire=KYODO JBN/ --

A research team led by Assistant Professor Duong Hai Minh from the Department

of Mechanical Engineering at the National University of Singapore's (NUS)

Faculty of Engineering, has achieved a world's first by successfully converting

paper waste into green cellulose aerogels that are non-toxic, ultralight,

flexible, extremely strong and water repellent. This novel material is ideal

for applications such as oil spill cleaning, heat insulation as well as

packaging, and it can potentially be used as coating materials for drug

delivery and as smart materials for various biomedical applications.   

The NUS team has also developed a more eco-friendly process to convert paper

waste into aerogels.

"Our fabrication process uses 70 per cent less energy, produces fewer polluting

emissions into the air and water, and uses less dioxins in the chlorine

bleaching process. It is also faster -- the entire process only takes three

days," explained Asst Prof Duong.

The novel cellulose aerogels developed by the NUS team boast super high oil

absorption capacity. Coated with Trimethoxy-methylsilane (MTMS), the aerogels

are water repellent and are capable of absorbing oil (excluding water) up to 90

times their dry weight, making them up to four times more effective than

commercial oil sorbents. Furthermore, they can be squeezed to recover over 99

per cent of the crude oil absorbed.   

Another important application of the novel cellulose aerogels is to serve as

insulation materials for buildings. The water repellent property of the

cellulose aerogels allows them to be adaptable to both dry and rainy weather

and their structure remains stable for about six months in tropical climates.

Being extremely strong, they increase building strength. In addition, these

aerogels are lightweight and slim, resulting in slimmer walls, thus increasing

building space.

The novel cellulose aerogels developed by the NUS team could also signal a

change in the packing industry. Plastic-based packing materials such as the

bubble wrap could be replaced with biodegradable aerogel-based foam or advanced

cellulose aerogel nanosheets, which are environmentally-friendly.

With high surface area and high porosity, the biodegradable aerogels could also

be used as coating materials in drug delivery or as smart materials.

The NUS team has also discovered a way of expanding the weight capacity of the

cellulose aerogels. This is done by infusing the fibres of the cellulose

aerogels with a solution of metallic nanoparticles. The cellulose aerogels are

then hammered flat to remove most of the air, resulting in a magnetic thin film

that has a weight capacity of over 28 tonnes per square centimetre.

MTMS-uncoated cellulose aerogels are hydrophilic, thus they can also absorb and

retain huge volumes of polar fluids such as water and alcohol. Therefore, they

can be used in products such as baby diapers and sanitary napkins.

In addition, compressed cellulose aerogels can be used to plug life-threatening

wounds such as a gunshot or stabbing lesion by injecting them into the wound

cavity. The sponges expand inside the cavity, creating pressure that can block

bleeding and life-threatening haemorrhage in 20 seconds or less. This

incredible speed is a remarkable boon, which could greatly enhance survival

rates.

The team has filed a patent for their invention in USA, China, India and

Southeast Asia. The technology has been licensed by the NUS Liaison Office,

which is part of NUS Enterprise, to Bronxculture Pte Ltd in November 2015 for

commercialisation.

More information about the study:

https://news.nus.edu.sg/press-releases/9962-novel-cellulose-aerogels

MEDIA CONTACT:

Karen LOH                                          

National University of Singapore         

DID: +65-6601-1485

Email: karenloh@nus.edu.sg

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SOURCE: National University of Singapore