The friction on a graphene surface can be dynamically tuned using external electric fields, according to researchers at the University of Illinois Urbana-Champaign led by Professor Rosa Espinosa-Marzal of the Department of ...
Nanophysics
Sep 27, 2023
0
173
A study showing how electrons flow around sharp bends, such as those found in integrated circuits, has the potential to improve how these circuits, commonly used in electronic and optoelectronic devices, are designed.
Nanophysics
Sep 19, 2023
0
160
There has been a real race among scientists to create a technology that enables easy protein sequencing. Professor of Chemical Biology Giovanni Maglia of the University of Groningen has now found the missing piece in the ...
Biotechnology
Sep 18, 2023
0
189
Through a nuanced balance of electrical and hydrophobic forces, biological molecules self-assemble into the large functional structures that maintain life's vital functions. Understanding how proteins self-assemble requires ...
Cell & Microbiology
Sep 1, 2023
0
10
Since the 1960s there has been plenty of evidence to support the existence of dark matter through astrophysical and cosmological observations, and at this point we're very confident that it exists. The question remains, though: ...
General Physics
Sep 1, 2023
1
46
Aqueous rechargeable zinc ion batteries are promising components for electric grid storage due to their low cost and intrinsic safety. However, their practical implementation is hindered by poor reversibility of the zinc ...
Nanomaterials
Aug 31, 2023
0
32
Just off a tree-covered side road past businesses selling boats and fishing gear sits a fenced-off building that's home to a $700 million satellite nearly ready for launch. Its mission: To study the metal-rich asteroid Psyche, ...
Space Exploration
Aug 23, 2023
0
1
"Trimming" the edge-states of a topological insulator yields a new class of material featuring unconventional "two-way" edge transport, as reported in a new theoretical study from Monash University, Australia, published in ...
Condensed Matter
Aug 22, 2023
0
42
The past few weeks have seen a huge surge of interest among scientists and the public in a material called LK-99 after it was claimed to be a superconductor at room temperature and ambient pressure.
Superconductivity
Aug 21, 2023
0
8
A mysterious magnetic effect that causes the path that electrons take through a material to bend—called the anomalous Hall effect—has been elucidated in a new mathematical analysis by two RIKEN physicists. Their work ...
Quantum Physics
Aug 17, 2023
0
11
In physics, the space surrounding an electric charge or in the presence of a time-varying magnetic field has a property called an electric field. This electric field exerts a force on other electrically charged objects. The concept of an electric field was introduced by Michael Faraday.
The electric field is a vector field with SI units of newtons per coulomb (N C−1) or, equivalently, volts per metre (V m−1). The SI base units of the electric field are kg·m·s−3·A−1. The strength of the field at a given point is defined as the force that would be exerted on a positive test charge of +1 coulomb placed at that point; the direction of the field is given by the direction of that force. Electric fields contain electrical energy with energy density proportional to the square of the field intensity. The electric field is to charge as gravitational acceleration is to mass and force density is to volume.
A moving charge has not just an electric field but also a magnetic field, and in general the electric and magnetic fields are not completely separate phenomena; what one observer perceives as an electric field, another observer in a different frame of reference perceives as a mixture of electric and magnetic fields. For this reason, one speaks of "electromagnetism" or "electromagnetic fields." In quantum mechanics, disturbances in the electromagnetic fields are called photons, and the energy of photons is quantized.
This text uses material from Wikipedia, licensed under CC BY-SA
