Results 31 to 40 of about 72,046 (253)

Mechanisms and Materials for NTE

Frontiers in Chemistry, 2018
Negative thermal expansion (NTE) upon heating is an unusual property but is observed in many materials over varying ranges of temperature. A brief review of mechanisms for NTE and prominent materials will be presented here.
J. Paul Attfield
doaj   +1 more source

Negative Thermal Expansion Properties of Sm0.85Sr0.15MnO3-δ

Journal of Composites Science, 2022
A novel negative thermal expansion (NTE) material composed of Sm0.85Sr0.15MnO3-δ was synthesized using the solid-state method. By allowing Sr2+ to partially replace Sm3+ in SmMnO3, the ceramic material Sm0.85Sr0.15MnO3-δ exhibits NTE properties between 360K and 873K, and its average negative thermal expansion coefficient was −10.08 × 10−6/K.
Yucheng Li, Yang Zhang, Yongtian Li, Yifeng Wu   +3 more
openaire   +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

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

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

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

Three phosphatase families form a community: The phosphohydrolases that act upon inositol pyrophosphates

FEBS Letters, EarlyView.
Inositol pyrophosphates are energy‐rich signaling molecules that perform critical functions in cells. Three different families of phosphatases hydrolyze the β phosphate of the inositol pyrophosphate molecules: two have narrow specificities and one is promiscuous.
Ronda J. Rolfes
wiley   +1 more source