Using biominerals as an inspiration, Livermore physicist Jim De Yoreo and his LLNL research team have determined a key factor in how to manipulate the shapes of crystals.
In a series of experiments using an atomic force microscope, De Yoreos team and that of Patricia Dove, a geoscientist from Virginia Polytechnic Institute and State University, used four different biomolecules to study their effects on the dynamics of atomic steps during crystallization. They set out to test a two-decade-old model of crystal-shape modification believed to be at odds with classic theories of crystal growth. Their results appear in the Nov. 19 issue of the journal, Science.
The main focus of the work was on the mineral calcite, which has more than 300 identified crystal forms that can combine to produce at least a thousand different crystal variations. Crystals can form a thousand different shapes by combining the basic forms of the positive rhombohedron (a prism with six faces, each a rhombus), negative rhombohedron, steeply, moderately and slightly inclined rhombohedrons, various scalahedrons, prism and pinacoid. De Yoreo and Dove first determined that when combined with magnesium, the corners formed by the intersection of atomic steps flatten and roughen, leading to flattening of the crystals corners and elongation and roughening of the crystal shape.
Anne M. Stark | EurekAlert!
Immune Defense Without Collateral Damage
23.01.2017 | Universität Basel
The interactome of infected neural cells reveals new therapeutic targets for Zika
23.01.2017 | D'Or Institute for Research and Education
For the first time ever, a cloud of ultra-cold atoms has been successfully created in space on board of a sounding rocket. The MAIUS mission demonstrates that quantum optical sensors can be operated even in harsh environments like space – a prerequi-site for finding answers to the most challenging questions of fundamental physics and an important innovation driver for everyday applications.
According to Albert Einstein's Equivalence Principle, all bodies are accelerated at the same rate by the Earth's gravity, regardless of their properties. This...
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
23.01.2017 | Health and Medicine
23.01.2017 | Physics and Astronomy
23.01.2017 | Process Engineering