Modeling steady-state experiments with a scanning electrochemical microscope involving several independent diffusing species using the boundary element method

Article Abstract:

The extension of the exterior boundary element method (BEM) formalism is described to treat more than one independent concentration variable in a true three-dimensional (3D) space and applied to a simple sample-generation/tip-collection mode (SG/TC) experiment with enzyme galactosidase. A simulated example mimicking a possible scenario of a low-density protein array with considerable compromises in the resolving power is noted when the flux from two neighboring spots differs by more than a factor of 2.

Science & research, Usage, Scanning electron microscopes, Alpha galactosidases

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In situ scanning tunneling microscopy of well-defined Ir(111) surface: high-resolution imaging of adsorbed sulfate

Article Abstract:

A study conducted the first in situ electrochemical scanning tunneling microscopy of sulfate adsorption on the atomically flat surface of Ir(111) with well defined, step terrace structure. The Ir(111) in HClO4 solution had a hexagonal structure with atomic distance of 0.27 nm in the potential range from 0.1 V - 1.0 V. A model for the co-adsorption of water and sulfate was used to explain the observed adlayer structure. Other experimental findings are presented.

Analysis, Case studies, Adsorption, Surface chemistry, Sulfates, Iridium

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