Atomistic mechanisms of adhesion and surfaces compression of diamond
نویسندگان
چکیده
The interactions which occur when two diamond 1 I I I ) surfaces come into contact for short times have been examined via molecular dynamics. When both surfaces are hydrogen terminated these surfaces can be brought into contact, compressed, and separated with no damage to either surface. After compression and subsequent separation the surfaces and the bulk lattice regain their original geometry. The same is true if the hydrogen surface layer is totally removed from one of the lattices. In contrast, when both surfaces are partially hydrogen terminated. contact followed by compression and retraction results in the transfer of hydrogen atoms and the formation of a connective link of carbon atoms between surfaces. The formation of this connective neck of atoms and its subsequent fracture lead to significant damage to the surface and subsurface layers of the lattices.
منابع مشابه
Atomistic Factors Governing Adhesion between Diamond, Amorphous Carbon, and Model Diamond Nanocomposite Surfaces
متن کامل
Influential Mechanisms and Potential Applications of Nano-Silicas in Cement Composites
Nanosilicas have been known as super-pozzolanic materials and compared to silica fume, these materials have higher purity of silica and finer particles. However, in contrast to silica fume, nanosilicas are produced by various methods, leading to different morphologies and agglomeration statuses in their initial form. On the other hand, due to several mechanisms such as the bridging effect of ca...
متن کاملIn Vitro Effects of Four Porcelain Surface Treatment Methods on Adhesion of Lactobacilli Acidophilus
Objective: Adhesion of Lactobacillus acidophilus (L. acidophilus) to dental porcelain surface may lead to gingival inflammation and secondary caries. Surface roughness is among the factors affecting this adhesion. The purpose of this study was to evaluate the effects of four different surface treatment methods on adhesion of L. acidophilus to dental porcelain. Methods: Sixty specimens (3x10...
متن کاملAdhesion mechanisms of curli subunit CsgA to abiotic surfaces
Curli fibers are functional amyloids that play a key role in biofilm structure and adhesion to various surfaces. Strong bioinspired adhesives comprising curli fibers have recently been created; however, the mechanisms curli uses to attach onto abiotic surfaces are still uncharacterized. Toward a materials-by-design approach for curli-based adhesives and multifunctional materials, we examine cur...
متن کاملNanoscale Modeling of Shock-Induced Deformation of Diamond
Molecular dynamics (MD) simulations of shock-induced deformations in diamond were performed using a reactive bond order (REBO) potential. A splitting of shock wave structure into elastic and crystal deformation fronts was observed in the [110] and [111] crystallographic directions above piston velocity thresholds of up ≈ 1.8 and 2.5 km/s, respectively. The crystal lattice response in a split tw...
متن کامل