Patch probe

Martin, R. L. and French, E. C., Corrosion Monitoring in Sour Systems Using Electrochemical Hydrogen Patch Probes Conf. Soc. of Pet. Engrs. of AIME, Sour Gas Symposium, Texas, (1977)... 

Anilino-l-naphathalene sulfonic acid (ANS) is a sensitive hydrophobic patch probe [160], The protyrosinase did not bind ANS, whereas the acid-activated tyrosinase did bind ANS by an increase of the fluorescence intensity (Figure 42). These results reveal that the... 

As shown in Fig. 7a and b, HT/HP systems have been used for both laboratory and field measurements of hydrogen flux commonly called a patch probe or barnacle cell 11 They have typically been used for the monitoring of... 

FIG. 7—Hydrogen permeation cell for conducting tests on HT/HP system with external electrochemical hydrogen patch probe. 

French, E. C. and Hurst, L. R, Hydrogen Monitoring by the Hydrogen Patch Probe, Corrosion/80, Paper 47, NACE, Houston, TX. 

Fig. 12.13 An dectrochemical patch probe for the meesuretnent of the hydrogen penetration rate through a process vessel or pipe. Courtesy Petrolite Corp.)...

There are two types of non-intrnsive hydrogen patch probes. The first comprises a carbon steel patch contoured to fit the outside of the vessel or pipe, and welded to it. 

As with the other types of hydrogen probe deseribed above, the electrochemical patch probe requires an initial stabilization period. In addition, it requires regular maintenance in the form of electrolyte replenishment and/or renewal. 

Symptoms Yellowing patches on lawns in dry weather. Starlings may probe lawns in search of leatherjackets. 

A different situation has been observed using mixtures of thiolates with immiscible chains. AuNPs protected by mixed monolayers of different composition made of HS-C8-TEGME and HS-F8-PEG have been investigated by ESR spectroscopy using a radical probe sensitive to the hydrophobicity of the environment.223 The ESR spectral parameters of the probe in the monolayer are identical to those of the probe in a completely fluorinated medium when the ratio (Rcf) between alkyl and perfluoro-alkyl is lower than 2.5. Only at RCp > 2.5, the probe starts to experience the environment of alkyl chains. The experimental results support the phase segregation of perfluoroalkyl thiolates in patches on nanoparticles with a core size of 2.5 to 4.0 nm.223... 

In conclusion, CO is an excellent probe molecule for the properties of coordinatively unsaturated surface Zn2+ sites, both isolated sites or those grouped into 2D patches. It is also emphasized that the prismatic faces also expose coordinatively unsaturated oxygen ions their presence, however, is indirectly detected only via their influence on the electrostatic field at the Zn2+ center. 

Since the 1970s, patch-clamp electrodes (electrodes placed inside a borosilicate glass pipet that is then heated and pulled, with its contents, to submicron-size diameters) have been used as micron-sized probes in elec-trophysiology experiments. Since 2000, single-walled and multiple-walled carbon nanotubes have been used as nanoelectrodes. 

---