Results 31 to 40 of about 77,031 (254)

Negative thermal expansion induced by intermetallic charge transfer

Science and Technology of Advanced Materials, 2015
Suppression of thermal expansion is of great importance for industry. Negative thermal expansion (NTE) materials which shrink on heating and expand on cooling are therefore attracting keen attention.
Masaki Azuma, Kengo Oka, Koichiro Nabetani   +2 more
doaj   +1 more source

Fabrication and characterization of ZrW2O8-Cf/E51 negative thermal expansion composite

Materials Research Express, 2020
ZrW _2 O _8 -C _f /E51 composite with a negative Coefficient of Thermal Expansion (CTE) was fabricated by a method combining mechanical stirring with ultrasonic vibration, then microstructures and properties of the composites were analyzed and summarized
Luyan Ju, Jianbing Zhang, Yuqin Ma, Shengyong Xia, Wenlan Wei, Yong Zhang   +5 more
doaj   +1 more source

Modeling Wear and Friction Regimes on Ceramic Materials with Positive and Negative Thermal Expansion

Lubricants, 2023
Computer modeling of rubbing between two surfaces with microasperities capable of expanding or contracting under conditions of frictional heating (i.e., possessing either positive and negative coefficient of thermal expansion (CTE)) allowed for the ...
Aleksandr S. Grigoriev, Evgeny V. Shilko, Andrey I. Dmitriev, Sergei Y. Tarasov   +3 more
doaj   +1 more source

Magnetic ordering and negative thermal expansion in PrFeAsO [PDF]

Physical Review B, 2008
We report the structure and magnetism of PrOFeAs, one of the parent phases of the newly discovered Fe-As superconductors, as measured by neutron powder diffraction. In common with other REOFeAs materials, a tetragonal-orthorhombic phase transition is found on cooling below 136 K and striped Fe magnetism with $k =$(1,0,1) is detected below $\sim$ 85 K ...
Kimber, S. A. J., Argyriou, D. N., Kondrat, A., Büchner, B., Yokaichiya, F., Habicht, K., Gerischer, S., Hansen, T., Chatterji, T., Klingeler, R., Hess, C., Behr, G.   +11 more
openaire   +3 more sources

Zentropy Theory for Positive and Negative Thermal Expansion

Journal of Phase Equilibria and Diffusion, 2022
It has been observed in both natural and man-made materials that volume sometimes decreases with increasing temperature. Though mechanistic understanding has been gained for some individual materials, a general answer to the question "Why does volume sometimes decrease with the increase of temperature?" remains lacking.
Zi-Kui Liu, Yi Wang, Shun-Li Shang
openaire   +2 more sources

A systematic study of the negative thermal expansion in zinc-blende and diamond-like semiconductors

New Journal of Physics, 2019
Upon heating, almost all zinc-blende (ZB) and diamond-like semiconductors undergo volume contraction at low temperature, i.e. negative thermal expansion (NTE), instead of commonly expected expansion.
Kaike Yang, Jin Xiao, Jun-Wei Luo, Shu-Shen Li, Su-Huai Wei, Hui-Xiong Deng   +5 more
doaj   +1 more source

A novel design of mechanical metamaterial incorporating multiple negative indexes

Materials Research Express, 2023
Mechanical metamaterials that combine multiple negative properties are rare, but have great appeal for applications in multipurpose devices. Herein, a novel metamaterial incorporating negative Poisson’s ratio, negative compressibility, and negative ...
Yu Yao, Ling Hui He, Jian Hai Jin, Jun Ding   +3 more
doaj   +1 more source

Nanosizing suppresses negative thermal expansion in Cu2P2O7

Nano Research
Negative thermal expansion (NTE), where materials contract rather than expand with temperature rise, is crucial for applications requiring thermal stability, and its regulation holds significant technological promise.
Naike Shi, Andrea Sanson, Yiqing Liu, Danilo Oliveira De Souza, Luca Olivi, Jun Chen, Longlong Fan   +6 more
doaj   +1 more source

Gut microbiome and aging—A dynamic interplay of microbes, metabolites, and the immune system

FEBS Letters, EarlyView.
Age‐dependent shifts in microbial communities engender shifts in microbial metabolite profiles. These in turn drive shifts in barrier surface permeability of the gut and brain and induce immune activation. When paired with preexisting age‐related chronic inflammation this increases the risk of neuroinflammation and neurodegenerative diseases.
Aaron Mehl, Eran Blacher
wiley   +1 more source

Reconstructing enzyme evolution by protein engineering

FEBS Letters, EarlyView.
Natural enzyme evolution can be retraced by protein engineering methods such as directed evolution, rational design, and ancestral sequence reconstruction. These approaches reveal how enzymes emerged from ligand‐binding scaffolds, developed varying substrate preferences, formed oligomeric complexes, adapted to environmental changes, and evolved novel ...
Lukas Drexler, Markus R. Busch, Reinhard Sterner   +2 more
wiley   +1 more source