Activation index stearic acid

Figure 5.6 shows that with the increasing mass fraction of stearic acid, the activation index of whiskers increases at first and then decreases. The mass fraction of the highest activation index is 4.0% after that, with an increase of the mass fraction of stearic acid, the activation index decreases, which indicates that the activation index reaches the highest value when the whisker surface is completely coated by stearic acid. More stearic acid will cause excessive accumulation and then reduce the activation index. 

As seen from Table 5.3, the products modified by tita-nate NDZ-101, sodium stearate, stearic acid, and Zinc stearate acid zinc exert the highest activation index nevertheless, the modification effects of other modifiers are relatively poor. The results of contact angle also support this point. Among these four modifiers, sodium stearate modified products hold the maximum contact angle and have lower costs. ... 

The index of hydrolysis was the formation of ste (-l- C)-sph from cerebrosides containing stearic-1- C acid. The use of a detergent mixture containing sodium cholate was required for hydrolysis. The enzyme showed maximum activity at pH 4.5, at which point both the enzyme and cholate precipitated. Other substrates included naturally occurring cerebrosides (galactose containing) and showed the formation of ceramides containing normal and a-hydroxy fatty acid. Enzyme activity was seen also in rat brain, spleen, and kidney. 

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