Properties of materials are often defined by imperfections in their atomic structure, especially when the material itself is just one atom thick, such as graphene. Researchers at the University of Vienna have now developed ...
Nanophysics
Jun 18, 2021
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16
Commonplace pharmaceuticals, such as ibuprofen, can carry with them an inherent flaw in their atomic structure, which pairs the active, beneficial ingredient with a potentially ineffective—or even toxic—counterpart. New ...
Materials Science
Jun 16, 2021
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18
Much of human invention and innovation has been the result of our discovery and replication of natural phenomena, from birds in flight to whales that dive deep into the ocean. For the first time, researchers have captured ...
Cell & Microbiology
May 28, 2021
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193
As the miniaturization of technology continues, scientists are seeking to engineer materials at the atomic level. In Nature Communications, researchers from the RIKEN Cluster for Pioneering Research and RIKEN Center for Advanced ...
Nanophysics
May 25, 2021
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26
In new research, Texas A&M University scientists have for the first time revealed a single microscopic defect called a "twin" in a soft-block copolymer using an advanced electron microscopy technique. This defect may be exploited ...
Condensed Matter
May 19, 2021
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548
A team of researchers from China, the Netherland and Saudi Arabia has used a new kind of electron microscopy to measure weak van der Waals interactions. In their paper published in the journal Nature, the group describes ...
Scientists at Sanford Burnham Prebys have identified, at an atomic level, how a part of a protein called PLEKHA7 interacts with a cell's membrane to regulate important intercellular communications.
Biochemistry
Apr 20, 2021
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20
The semiconductor industry and pretty much all of electronics today are dominated by silicon. In transistors, computer chips, and solar cells, silicon has been a standard component for decades. But all this may change soon, ...
Condensed Matter
Apr 13, 2021
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5
Solar cells made of crystalline silicon achieve peak efficiencies, especially in combination with selective contacts made of amorphous silicon (a-Si:H). However, their efficiency is limited by losses in these contact layers. ...
Nanophysics
Mar 17, 2021
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14
Light-absorbing molecules can transform photons into electricity or fuels by shuttling electrons from one atom to another. In many cases the molecules are surrounded by a solvent—water, in the case of photosynthesis—and ...
Analytical Chemistry
Mar 15, 2021
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26
In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a mathematical solution is known, and add an additional "perturbing" Hamiltonian representing a weak disturbance to the system. If the disturbance is not too large, the various physical quantities associated with the perturbed system (e.g. its energy levels and eigenstates) can, from considerations of continuity, be expressed as 'corrections' to those of the simple system. These corrections, being 'small' compared to the size of the quantities themselves, can be calculated using approximate methods such as asymptotic series. We can therefore study the complicated system based on our knowledge of the simpler one.
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