Gold surfaces development

A rational manipulation of the electrode surface functionality by immobilizing selected types of molecules is an essential key for the development of electrochemical sensors and devices. One of the recent studies in this area has focused on monolayer formation on gold surfaces from organosulfur precursors [11]. Stable attachment of organic molecules to gold... 

To validate the model developed in the present study, the simulations are first conducted and compared with the experimental results of Wachters and Westerling (1966). In their experiments, water droplets impact in the normal direction onto a hot polished gold surface with an initial temperature of 400 °C. Different impact velocities were applied in the experiment to test the effect of the We number on the hydrodynamics of the impact. The simulation of this study is conducted for cases with different Weber numbers, which represent distinct dynamic regimes. 

Recently, a method has been developed to measure the 634S value for seawater DMS (22). The collection method uses a gold wool system (401 to preconcentrate DMS from air equilibrated with surface seawater. DMS is thermally desorbed from the gold surface with hot hydrogen gas. DMS reacts with the hydrogen to produce hydrogen sulfide which, when bubbled through an arsenic ammonia solution, produces arsenic sulfide (22). This method makes it possible to collect sufficient quantities of seawater DMS for TIMS analysis as arsenic sulfide. 

Considering the affinity between metal ions (i.e., Zn2+, Cu2+, Ni2+, and Co2+) and proteins another method to pattern proteins on gold surfaces by DPN was developed.130 This method utilizes Zn2+ ions (Zn(N03)2 6H20) that can be coordinated with MHDA, which can be patterned on gold by an AFM tip after passivation of the remaining gold areas with PEG-SH. The Zn-modified features can be subsequently reacted with the desired antibody. Biorecognition properties can be further studied by interaction with other proteins. 

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