scholarly journals Electrical and Elastic Properties of Individual Single‐Layer Nb 4 C 3 T x MXene Flakes

2020 ◽  
Vol 6 (4) ◽  
pp. 1901382 ◽  
Author(s):  
Alexey Lipatov ◽  
Mohamed Alhabeb ◽  
Haidong Lu ◽  
Shuangshuang Zhao ◽  
Michael J. Loes ◽  
...  
Nanoscale ◽  
2021 ◽  
Author(s):  
Antonios Raptakis ◽  
Arezoo Dianat ◽  
Alexander Croy ◽  
Gianaurelio Cuniberti

This computational study establishes a correlation between the elastic properties of COFs and their building-blocks towards the rational design of new materials with tailored properties.


2009 ◽  
Vol 94 (10) ◽  
pp. 101904 ◽  
Author(s):  
C. D. Reddy ◽  
A. Ramasubramaniam ◽  
V. B. Shenoy ◽  
Yong-Wei Zhang

Geophysics ◽  
2017 ◽  
Vol 82 (4) ◽  
pp. WA119-WA145 ◽  
Author(s):  
Zvi Koren ◽  
Igor Ravve

Sedimentary layers affected by vertical compaction and strong lateral tectonic stresses are often characterized by low anisotropic symmetry (e.g., tilted orthorhombic [TOR]/monoclinic or even triclinic). Considering all types of pure-mode and converted waves, we derive the normal moveout (NMO) series coefficients of near normal-incidence reflected waves in arbitrarily anisotropic horizontally layered media, for a leading error term of order six. The NMO series can be either a function of the invariant horizontal slowness (slowness domain) or the surface offset (offset domain). The NMO series coefficients, referred to also as effective parameters, are associated with the corresponding azimuthally varying NMO velocity functions. We distinguish between local (single-layer) and global (overburden multilayer) effective parameters, which are related by forward and inverse Dix-type transforms. We derive the local effective parameters for an arbitrary anisotropic (triclinic) layer, which is the main contribution of this paper. With some additional geologic constraints, the local effective parameters can then be converted into the interval elastic properties. To demonstrate the applicability of our method, we consider a synthetic layered model in which each layer is characterized with TOR symmetry. The corresponding global effective model loses the symmetries of the individual layers and is characterized by triclinic symmetry.


2020 ◽  
Vol 101 (13) ◽  
Author(s):  
L. L. Li ◽  
C. Bacaksiz ◽  
M. Nakhaee ◽  
R. Pentcheva ◽  
F. M. Peeters ◽  
...  

2015 ◽  
Vol 07 (04) ◽  
pp. 1550063 ◽  
Author(s):  
Dario Gastaldi ◽  
Gianluca Parisi ◽  
Riccardo Lucchini ◽  
Roberto Contro ◽  
Simone Bignozzi ◽  
...  

Damaged articular cartilage can be substituted by porous scaffolds exhibiting tailored mechanical properties and with a suited layer-based design. Reliable predictive models are able to provide a structure–property relationship in the design phase is still an open issue which is of prominent relevance. In this paper, a bottom-up homogenization approach is presented having the purpose to determine the elastic properties of each single layer of a osteochondral porous three-layers scaffold: a top cartilage chondral layer and two mineralized layers: an intermediate and a subchondral bone layer. For the cartilage top layer, dry and wet conditions are considered; while, for intermediate and bone layers only dry conditions are considered. The homogenization model is based on the porosity of each layer and on the elastic properties of the constituent materials, i.e., water, hydroxyapatite (HA) and collagen. The elastic moduli predicted for the mineralized layers are compared with available literature results. The model results obtained on the cartilage layers are validated through flat punch micro-indentation tests carried out on wet and dry samples. The results have shown that the elastic modulus of the mineralized layers is of the order of magnitude of few GPa; whereas, the elastic modulus of the cartilage layer which exhibits porosity higher than 90% is as low as 50 kPa and 300 kPa in wet and dry conditions, respectively. The above results show that the knowledge of the mechanical properties of the basic constituents which are universally known and the porosity of the layers are sufficient information to obtain a reliable prediction of the elastic properties of both mineralized layers and of cartilage layers.


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