Neutral surfaces

Near surface neutralization of Zn in bare InP Zn has also been reported after CH4/H2 reactive ion etching. In this particular case a one minute annealing at 350°C restores the zinc activity (Hayes et al., 1989). 

When the surface excess of anions exceeds that of cations, dy/dE is positive, as is observed in Figure 7.23a. Negative values of dy/dE correspond to larger surface excesses of cations, as shown by Figure 7.23b. Finally, the condition dy/dE = 0 corresponds to equal amounts of positive and negative adsorbed charge, that is, surface neutrality. Note that this is not the same as saying no ions are adsorbed. The slope of the electrocapillary curve measures the... 

Anionic surfaces flat adsorption (DADMAC with low or moderate molar mass) partial adsorption (copolymers with low charge density, homo-and copolymers with high molar mass, branched structures) recharge of surfaces, neutralization, stabilization... 

The stainless steel powder and discs were cleaned by immersing in a boiling bath of 15% NaOH for one hour with continuous stirring. The caustic was decanted and the surfaces neutralized by the addition of hot 10% nitric acid for less than five minutes. The acid was decanted and the stainless steel powder was rinsed in the same manner as the glass powder and freeze dried. The surface after such a passivation treatment consists pmbably of ferric ferrite, Fe(Fe02)3-. The surface area was 0.14 ttr/ghy B.E.T. nitrogen adsorption. 

There has been much discussion about the pH of the environment inhabited by H. pylori. Although some would have the gastric surface neutral in spite of several hours with a luminal pH of approximately 1.0, most would agree that with a luminal pH of less than 2.0, surface pH is also 2.0 or less. Hence, H. pylori thrives in an acidic environment. 

Lea Antistat when applied to plastic and non-metallic surfaces, neutralizes ststic charge build-up—a common source for attracting lint and dirt in buffing operations, storage or other handling. Lea Antistat leaves a transparent colorless coating on the surface. 

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