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| Titel: |
Examining Solute-Solvent Interactions at the Electrode Double Layer by Impedance Measurements of Proteins: 1. Collagen |
| Auteur: |
C.V. Krishnan and Merrill Garnett |
| Verschenen in: |
International journal of electrochemical science |
| Paginering: | Jaargang 1 (2006) nr. 5 pagina's 215-227 |
| Jaar: |
2006 |
| Inhoud: |
Cyclic voltammograms of Type IV collagen from human placenta in the absence and presence of NaCl in aqueous solutions using a static mercury drop electrode indicate adsorption of the collagen at the electrode surface and strong interaction between collagen and NaCl. Impedance measurements, especially admittance, of the collagen in the absence and presence of NaCl suggest structural effects of water near the double layer. For collagen only, the admittance increases from 5000 Hz to about 50 Hz and then decreases. During this process the two admittance maxima shift to less negative potentials suggesting changes in the orientation of water. The first maximum seems related to the orientation effects near the peptide groups. The shift in the second maximum seems similar to the common electrolytes and is related to the double layer change when the potential of the mercury changes from negative to slightly positive. The admittance behavior is somewhat similar in the presence of NaCl with the admittance decrease happening at much higher frequencies than 50 Hz. The negative differential resistance observed at 0.4V, though not spectacular, suggests chaotic behavior, similar to many biological molecules, and is indicative of a tunnel diode or resonant tunneling. There was no clear-cut evidence for any saddle-node or hopf bifurcations in this system. Capacitance data show dispersion effects and there is a slight NaCl dependence on the potential of the capacitance maximum. Mott-schottky plots indicate both p-type and n-type semi conduction behavior. Phase microscopy shows self-assembly is dependent on the presence of sodium chloride. |
| Uitgever: |
Electrochemical Science Group |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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