HOME >> BIOLOGY >> NEWS
Nature designs hard and tough materials at the nanoscale

The nanoscale size of mineral particles in bone, tooth, and other biological materials may have evolved to ensure optimum strength and maximize tolerance of flaws, according to new research conducted at the Max Planck Institute for Metals Research and Austrian Academy of Sciences. While it is quite clear that the composite character of biological materials plays an important role, little is known about the role of the nanometer scale of mineral particles. The new study provides further insight into the mystery how nature produces hard and tough materials out of protein as soft as the human skin and mineral as fragile as the classroom chalk. The key finding of this research is that there exists a critical nanometer size at which the particles found in biocomposites become insensitive to flaws: They maintain strength equivalent to a perfect crystal despite inherent defects. This phenomenon also suggests that the engineering concept of stress concentration at flaws is no longer valid for nanoscale design. (Gao et al., PNAS, 2003, Vol. 100, No. 10, pp. 5597-5600.)

The science and technology of materials have set milestones of human civilization. We have mastered the art of making a wide variety of materials with many interesting mechanical properties. Some materials like ceramics, glasses and mineral crystals are hard and fragile. Others like rubbers and collagen are soft and tough. During the Bronze and Iron ages, man learned to make hard and tough materials in the form of various metals and metallic alloys. With the maturity of the field of metallurgy during the 20th century, we now understand that the hardness and toughness of metals are largely attributed to their crystalline structure which allows an important class of material defects called dislocations to move around and relieve stress concentration at crack-like flaws. One of the next big challenges for humanity is to develop hard and tough materials without dislocations, as this would open a vast new t
'"/>

Contact: Prof. Huajian Gao
hjgao@mf.mpg.de
49-711-689-3510
Max-Planck-Gesellschaft
14-May-2003


Page: 1 2 3

Related biology news :

1. Nature mimics industry
2. Natures ambush: pregnancy more likely from single unprotected intercourse than believed
3. Nanosphere announces genetic detection advance in Nature Biotechnology
4. Bacteriophage genomics approach to antimicrobial drug discovery published in Nature Biotechnology
5. Nature and nurture in temperament
6. NYAS and Nature Publishing Group join forces
7. Nature cover story - Only 10% of all large fish are left in global ocean
8. Researchers discover structure of Natures circuit breaker
9. Catastrophic decline of Africas apes, Nature says
10. Scientists debate meaning of 40-million-year-old primate fossils in Nature
11. Gretchen Daily named Nature Conservancy senior scholar

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:5/21/2020)... ... May 20, 2020 , ... Catalent, the leading global ... and gene therapies, and consumer health products, today announced that Jean-François Chaubard, Senior ... the ISCT 2020 Paris Virtual conference, which takes place on 28 – 29 ...
(Date:5/21/2020)... ... May 21, 2020 , ... Agility Orthopedics, home to ... Boston area, is pleased to announce a partnership with Dallas-based Simple Interact to ... in the area, Agility Orthopedics is focused on speeding up patient workflows to ...
(Date:5/14/2020)... ... May 12, 2020 , ... ... Life Science Manufacturers accurately and easily project contracted liabilities with payers, providers ... models by projecting discounts/rebates to Commercial and Government entities, Copay and Patient ...
Breaking Biology News(10 mins):
(Date:4/23/2020)... NEWPORT NEWS, Va. (PRWEB) , ... April 22, ... ... shortage of essential equipment for healthcare providers to protect themselves from COVID-19. Virginia ... it requests from the Federal Emergency Management Association (FEMA). , As Governor Northam ...
(Date:4/22/2020)... ... April 21, 2020 , ... Ripple Science today announced ... trial teams are working remotely and have paused patient visits, forcing teams to ... their research during this uncertain time by giving research teams free access to ...
(Date:4/7/2020)... ... April 06, 2020 , ... Red Nucleus, ... sciences industry, has announced the release of at-home virtual learning resources for all ... the health and safety of our employees as we continue to implement measures ...
(Date:4/1/2020)... ... March 31, 2020 , ... ... a method using its revolutionary NEXTGENPCR endpoint thermocycler and consumables that decreases ... volumes, increased samples per run, and standard, affordable laboratory equipment, a qualitative ...
Breaking Biology Technology:
Cached News: