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- W2079797316 abstract "Poly-l-lysine adsorbs with high affinity to mica powder. Saturation coverages were determined at different [NaCl]s, pH's, and molecular weights; electrokinetic measurements were also made on the mica. Increasing [NaCl] from 1 mM to 1 M decreased adsorption slightly, probably due to competition between Na+ and the ϵ-amino groups on the polymer for sites on the mica. Adsorption from 0.1 M NaCl as a function of pH increased above pH 3.5 because of a developing negative charge on the mica. A further rise at pH 9.5 resulted from reduction of the polymer's charge which at lower pHs sets up an electrostatic barrier to adsorption. Adsorption at pH 11.2 was twice that at pH 5.6 over the molecular weight range 3600–564,000. At both pH's adsorption (mole · m−2) was inversely proportional to molecular weight, and at pH 5.6 it was about 70% of that calculated for close-packed, random coils. Comparison of adsorption and direct force measurements has also been made." @default.
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- W2079797316 date "1989-04-01" @default.
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- W2079797316 title "Adsorption of poly-l-lysine to mica powder" @default.
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- W2079797316 doi "https://doi.org/10.1016/0021-9797(89)90424-4" @default.
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