期刊
LANGMUIR
卷 29, 期 39, 页码 12194-12202出版社
AMER CHEMICAL SOC
DOI: 10.1021/la401931y
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资金
- EPSRC
- Physical and Theoretical Chemistry Laboratory (Oxford University)
- Royal Society
- Petroleum Research Fund [45964-AC7]
- European Union
- National Natural Science Foundation of China [21204102, U1262102]
- Fundamental Research Funds for the Central Universities [13CX02061A, 13CX05018A]
- Israel Science Foundation
- European Research Council
We used colloidal probe atomic force microscopy to measure the normal forces between the surface of a silica colloidal particle and a sparse layer of hyaluronan (hyaluronic acid, HA, MW approximate to 10(6) Da) covalently attached to a planar silica surface, both across pure water and following the addition of 1 mM MgCl2. It was found that in the absence of salt the HA layer repelled the colloidal silica surface during both approach and retraction. The addition of the MgCl2, however, changes the net force between the negatively charged HA layer and the opposing negatively charged silica surface from repulsion to adhesion. This interaction reversal is attributed to the bridging effect of the added Mg2+ ions. Our results provide first direct force data to support earlier simulation and predictions that such divalent cations could bridge between negative charges on opposing surfaces, leading to an overall reversal of force from repulsion to attraction.
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