Nav: Home

USTC develops a family of bioinspired artificial woods by traditional resins

August 10, 2018

Nature has provided us not only the fantastic materials, but also the inspiration for the design and fabrication of high-performance biomimetic engineering materials. Woods, which have been used for thousands of years, have received considerable attention due to the low density and high strength. The unique anisotropic cellular structure endow the woods with outstanding mechanical performances. In recent decades, various materials have been produced into monolithic materials with anisotropically cellular structures, trying to duplicate the lightweight and high-strength woods. However, the reported artificial wood-like materials suffer from unsatisfactory mechanical properties. Up to now, it is still a significant challenge to fabricate the artificial wood-like materials with the lightweight and high-strength properties.

Recently, a research team led by Prof. YU Shuhong from the University of Science and Technology of China (USTC) demonstrate a novel strategy for large-scale fabrication of a family of bioinspired polymeric woods with similar polyphenol matrix materials, wood-like cellular microstructures, and outstanding comprehensive performance by a self-assembly and thermocuring process of traditional resins (phenolic resin and melamine resin). This work was published on Science Advances entitled as "Bioinspired polymeric woods" on August 10th (Science Advances 2018, 4, eaat7223).

The liquid thermoset resins were firstly unidirectionally frozen to prepare a "green body" with the cellular structure, followed by the subsequent thermocuring to get the artificial polymeric woods. The artificial woods bear a close resemblance to natural woods in the mesoscale cellular structures, and exhibit well controllability in the pore size and wall thickness. Benefiting from the starting aqueous solution, it also represents a green approach to prepare multifunctional artificial woods by compositing various nanomaterials, such as cellulose nanofibers and graphene oxide.

The polymeric and composite woods manifest lightweight and high-strength properties with the mechanical strength comparable to that of natural wood. In contrast with natural woods, the artificial woods exhibit better corrosion resistance to water and acid with no decrease in mechanical properties, as well as much better thermal insulation (as low as ~21 mW m?1 K?1) and fire retardancy. The artificial polymeric woods even stand out from other engineering materials such as cellular ceramic materials and aerogels in terms of specific strength and thermal insulation properties. As a kind of biomimetic engineering materials, this new family of bioinspired polymeric woods is supposed to replace the natural wood when used in harsh environments.

This novel strategy provides a new and powerful route to fabricate and engineer a wide range of high-performance biomimetic engineering composite materials with desirable multifunctionality and advantages over the traditional counterparts, which will have broad applications in many technical fields.

University of Science and Technology of China

Related Mechanical Properties Articles:

A mechanical trigger for toxic tumor therapy
Cell-killing chemotherapies are designed to shrink cancerous tumors by accumulating in their ill-formed blood and lymph vessels, delivering a toxic dose to the cancer cells.
Device designed to exploit scattering of light by mechanical vibrations
Researchers at the University of Campinas's Gleb Wataghin Physics Institute (IFGW-UNICAMP) in São Paulo State, Brazil, have theoretically developed a silicon photonic device with a diameter of approximately 10 microns (μm), equivalent to one tenth of the thickness of a human hair, that would enable optical and mechanical waves vibrating at tens of gigahertz (GHz) to interact.
Nearly one-quarter of patients say mechanical heart valve disturbs sleep
Nearly one-quarter of patients with a mechanical heart valve say it disturbs their sleep, according to research presented today at EuroHeartCare 2017.
Microdevice provides novel method of measuring cell mechanical properties
Researchers from Kumamoto University in Japan have developed a new method of measuring the Young's modulus of a cell.
Achieving near-perfect optical isolation using opto-mechanical transparency
Researchers from the University of Illinois at Urbana-Champaign have demonstrated a new level of optical isolation necessary to advance on-chip optical signal processing.
A low-cost mechanical device for minimally invasive surgery
Surgeons can now use a new type of mechanical instrument to perform complex, minimally invasive procedures, also known as laparoscopic surgery, thanks to researchers and small business entrepreneurs funded by the National Science Foundation (NSF).
New mechanical metamaterials can block symmetry of motion, findings suggest
Engineers and scientists at The University of Texas at Austin and the AMOLF institute in the Netherlands have invented the first mechanical metamaterials that easily transfer motion effortlessly in one direction while blocking it in the other.
Improving the mechanical properties of polymer gels through molecular design
Research conducted at Nagoya University has revealed that the strength of normally brittle polymer gels can be increased using a design in which mobile cross-linking units are threaded on a polymer.
Sealing properties and its influence factors of spherical mechanical seal
The spherical mechanical seal which can automatically adjust the contact state of sealing surfaces is proposed to replace the frequently used plane mechanical seal in order to solve the problems that when a marine stern shaft is bent with shafting misalignment and stern bearing wear factors, etc., the sealing properties of a plane mechanical seal is declined with the increase of both contact pressure and temperature of sealing surface.
Where cells go: Mechanical and chemical cues collaborate to guide them
Living cells respond to biochemical signals by moving toward those at higher concentration, a process carefully mapped out by biologists over the past several decades.

Related Mechanical Properties Reading:

Mechanical Properties of Solid Polymers
by Ian M. Ward (Author), John Sweeney (Author)

Mechanical Properties of Natural Fiber Reinforced Polymers: Emerging Research and Opportunities (Advances in Chemical and Materials Engineering)
by Sarah S. Gebai (Author), Sarah S. Gebai (Editor), Ali M. Hallal (Editor), Mohammad S. Hammoud (Editor)

Mechanical Properties of Ceramics
by John B. Wachtman (Author), W. Roger Cannon (Author), M. John Matthewson (Author)

Mechanical properties of several neat polymer matrix materials and unidirectional carbon fiber-reinforced composites
by National Aeronautics and Space Administration (NASA) (Author)

Biomechanics: Mechanical Properties of Living Tissues, Second Edition
by Y. C. Fung (Author)

The Mechanical Properties of Wood
by Samuel J. Record (Author)

Mechanical Properties of Polymers and Composites (Mechanical Engineering)
by Robert F. Landel (Author), Lawrence E. Nielsen (Author)

An Introduction to the Mechanical Properties of Ceramics (Cambridge Solid State Science Series)
by David J. Green (Author)

Mechanical Properties of Materials (Solid Mechanics and Its Applications)
by Joshua Pelleg (Author)

Effect of Heat Treatment on the Mechanical Properties of 1 Per Cent Carbon Steel (Classic Reprint)
by H. J. French (Author)

Best Science Podcasts 2018

We have hand picked the best science podcasts for 2018. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

The Story Behind The Numbers
Is life today better than ever before? Does the data bear that out? This hour, TED speakers explore the stories we tell with numbers — and whether those stories portray the full picture. Guests include psychologist Steven Pinker, economists Tyler Cowen and Michael Green, journalist Hanna Rosin, and environmental activist Paul Gilding.
Now Playing: Science for the People

#487 Knitting in PEARL
This week we're discussing math and things made from yarn. We welcome mathematician Daina Taimina to the show to discuss her book "Crocheting Adventures with Hyperbolic Planes: Tactile Mathematics, Art and Craft for all to Explore", and how making geometric models that people can play with helps teach math. And we speak with research scientist Janelle Shane about her hobby of training neural networks to do things like name colours, come up with Halloween costume ideas, and generate knitting patterns: often with hilarious results. Related links: Crocheting the Hyperbolic Plane by Daina Taimina and David Henderson Daina's Hyperbolic Crochet blog...