arXiv subjects

Masato Ohnuma

Publications and source records attributed to Masato Ohnuma.

2 recordsLinked to original sources

arXiv2017

3D Nanoporous Gold with Very Low Parting Limit Derived from Au-based Metallic Glass and Enhanced Methanol Electro-oxidation Catalytic Performance

Nanoporous gold (NPG) with bi-continuous ligaments and pores structure has promising potential in functional applications, among which one prominent example is fuel cell electrocatalyst. However, current application of NPG is mostly limited to methanol electro-oxidation due to its weak catalytic performance. Here we report a simple chemical dealloying process, for generating peculiar three-dimensional (3D) free-standing NPG with high specific surface area associated with a novel porous cone shaped protrusion morphology. This NPG structure possesses the highest specific activity of catalytic performance reported NPG catalysts so far.

cond-mat.mtrl-sci↗

arXiv2013

2D anisotropic scattering pattern fitting using a novel Monte Carlo method: Initial results

Recently, a Monte Carlo method has been presented which allows for the form-free retrieval of size distributions from isotropic scattering patterns, complete with uncertainty estimates linked to the data quality. Here, we present an adaptation to this method allowing for the fitting of anisotropic 2D scattering patterns. The model consists of a finite number of non-interacting ellipsoids of revolution (but would work equally well for cylinders), polydisperse in both dimensions, and takes into account disorientation in the plane parallel to the detector plane. The method application results in three form-free distributions, two for the ellipsoid dimensions, and one for the orientation distribution. It is furthermore shown that a morphological restriction is needed to obtain a unique solution.

physics.data-an↗