Journal: Membranes

Article Title: TEM Tomography of Pores with Application to Computational Nanoscale Flows in Nanoporous Silicon Nitride (NPN)

doi: 10.3390/membranes8020026

Figure Lengend Snippet: COMSOL Multiphysics™ Simulations of Nanopores Reconstructed by Electron Tomography. ( A ) Reconstructed nanopore STLs can be representative of a region of a membrane with multiple pores or ( B ) of a single pore, where both have nanoscale structure. ( C ) Fluid flow simulations of B, showing regions of irregularity along nanopore sidewalls. ( D ) The velocity profile of a simple cylindrical representation of the nanopore in B. ( E ) Velocity contour plot of C, with streamlines overlaid (black). Flow enters from the top visible plane of the pore at V = 5.7 × 10 −5 m·s −1 and exits at the bottom plane at atmospheric pressure ( P gauge = 0). ( B , C , E ) are representations of the same nanopore at the same scale.

Article Snippet: The finalized contours were then exported into a 3D STL file, which can then be imported into other programs for simulation or visualization purposes, including tangible 3D-printable models ( ). shows the results of a COMSOL Multiphysics™ simulation where the tomographically generated STL defined the system geometry.

Techniques: Tomography

Journal: Nanomaterials

Article Title: Piezo-Potential Generation in Capacitive Flexible Sensors Based on GaN Horizontal Wires

doi: 10.3390/nano8060426

Figure Lengend Snippet: ( a ) Stripes of GaN wires assembled with the Boostream ® process. ( b ) Optical microscopy image of the wires. ( c ) Piezoelectric signal measured on three different regions of a flexible devices made of 104 µm long wires (see d). The sensor is subjected to a cycled local compression load/release of 1 N/cm² on 1 cm-diameter disk at the speed of 900 mm/min.

Article Snippet: For this purpose, the general piezoelectricity generation of the wires and its dependence on their local orientation will be studied by using the piezoelectric module of the COMSOL Multiphysics ® Simulation Software [ , ].

Techniques: Microscopy

Journal: Nanomaterials

Article Title: Piezo-Potential Generation in Capacitive Flexible Sensors Based on GaN Horizontal Wires

doi: 10.3390/nano8060426

Figure Lengend Snippet: Two-dimensional finite element calculation of non-conical (α = 0°) and conical (α = 1°) embedded GaN wires bended under 10 cm radius curvature. ( a ) Piezoelectric charge density mappings (note the different scales along X and Y). ( b ) Piezo-potential taken at the top m-plane facet al.ong the length for (lines) and the corresponding cross-section mappings of the potential across the structure in insets.

Article Snippet: For this purpose, the general piezoelectricity generation of the wires and its dependence on their local orientation will be studied by using the piezoelectric module of the COMSOL Multiphysics ® Simulation Software [ , ].

Techniques: