DLVO Interactions of Tungsten Oxide and Cobalt Oxide Surfaces Measured with the Colloidal Probe Technique

Andersson, Karin; Bergström, Lennart

doi:10.1006/jcis.2001.8021

Cited by 27 publications

(22 citation statements)

References 23 publications

(23 reference statements)

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“…34 The present observation of short-ranged repulsive forces is consistent with various earlier studies. 29,30,37,44,[52][53][54] Similar forces were reported between surfaces of metal oxides, 55,56 and between silica and an air bubble. 57 Acuna and Toledo 53,54 modeled this short-ranged force with a double-exponential, whereby the decay length of the longer-ranged contribution was reported to be 0.37 nm.…”

Section: Solutions Of a Simple Electrolytesupporting

confidence: 72%

Direct force measurements between silica particles in aqueous solutions of ionic liquids containing 1-butyl-3-methylimidazolium (BMIM)

Valmacco

Trefalt

Maroni

et al. 2015

Phys. Chem. Chem. Phys.

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Direct force measurements between silica particles were carried out using the colloidal probe technique, which is based on an atomic force microscope (AFM). The forces were investigated in aqueous solutions of ionic liquids (ILs) containing 1-butyl-3-methylimidazolium (BMIM) cations and chloride, dicyanamide, and thiocyanate as anions up to concentrations of about 1 M. The results were compared with the simple electrolyte KCl. ILs behave similar to the simple electrolyte at low concentrations, as the ILs dissociate fully into ions, and they lead to repulsive double layer forces. At higher concentrations, attractive van der Waals forces set in, but they are enhanced in the presence of ILs by additional attractive force, whose strength depends on the type of IL. This additional attraction probably originates from the interaction of adsorbed IL layers.

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Section: Solutions Of a Simple Electrolytesupporting

confidence: 72%

Direct force measurements between silica particles in aqueous solutions of ionic liquids containing 1-butyl-3-methylimidazolium (BMIM)

Valmacco

Trefalt

Maroni

et al. 2015

Phys. Chem. Chem. Phys.

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“…As an example for a metal, gold microspheres were produced by an electric discharge across a gap between two gold wires in an inert atmosphere [174]. Oxidized tungsten (6.3-7.9 mm radius, Bioforce laboratory, USA) were used and analyzed by XPS and zeta potential measurements [175]. In addition to microspheres, irregular particles and single crystals of micron size also have been used as probes.…”

Section: Colloidal Probesmentioning

confidence: 99%

“…With the AFM DLVO forces were measured between several materials which are of special interest in colloidal science, e.g. glass, silica, and silicon nitride [15,16,187,[427][428][429][430][431][432][433][434]; gold [327,429,435,436]; copper and nickel [437]; zinc and lead sulphide [171,172,438]; titanium oxide [169,339,340]; zirconia [165,166,410]; iron oxide [439]; tungsten [175]; cobalt [175]; and alumina [16,[439][440][441][442]. Different polymers [177,189,[443][444][445][446][447], Langmuir-Blodgett and other thin organic layers [126,329,411,448,449] have been analyzed.…”

Section: Electrostatic Double-layer Force and Dlvo Theorymentioning

confidence: 99%

Force measurements with the atomic force microscope: Technique, interpretation and applications

Butt

Cappella

Kappl

2005

Surface Science Reports

3,204

2,949

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“…30,31,34,37–42 This theory states that the total force acting upon the system is the sum to the electrostatic ( F el ), steric ( F st ), and van der Waals ( F vdW ) forces,…”

Section: Resultsmentioning

confidence: 99%

High Density Single-Molecule-Bead Arrays for Parallel Single Molecule Force Spectroscopy

Barrett¹,

Oliver²,

Cheng³

et al. 2012

Anal. Chem.

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The assembly of a highly-parallel force spectroscopy tool requires careful placement of single-molecule targets on the substrate and the deliberate manipulation of a multitude of force probes. Since the probe must approach the target biomolecule for covalent attachment, while avoiding irreversible adhesion to the substrate, the use of the polymer microsphere as force probes to create the tethered bead array poses a problem. Therefore, the interactions between the force probe and the surface must be repulsive at very short distances (< 5 nm) and attractive at long distances. To achieve this balance, the chemistry of the substrate, force probe, and solution must be tailored to control the probe-surface interactions. In addition to an appropriately designed chemistry, it is necessary to control the surface density of the target molecule in order to ensure that only one molecule is interrogated by a single force probe. We used gold-thiol chemistry to control both the substrate’s surface chemistry and the spacing of the studied molecules, through a competitive binding of the thiol-terminated DNA and an inert thiol forming a blocking layer. For our single molecule array, we modeled the forces between the probe and the substrate using DLVO theory and measured their magnitude and direction with colloidal probe microscopy. The practicality of each system was tested using a probe binding assay to evaluate the proportion of the beads remaining adhered to the surface after application of force. We have translated the results specific for our system to general guiding principles for preparation of tethered bead arrays and demonstrated the ability of this system to produce a high yield of active force spectroscopy probes in a microwell substrate. This study outlines the characteristics of the chemistry needed to create such a force spectroscopy array.

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DLVO Interactions of Tungsten Oxide and Cobalt Oxide Surfaces Measured with the Colloidal Probe Technique

Cited by 27 publications

References 23 publications

Direct force measurements between silica particles in aqueous solutions of ionic liquids containing 1-butyl-3-methylimidazolium (BMIM)

Direct force measurements between silica particles in aqueous solutions of ionic liquids containing 1-butyl-3-methylimidazolium (BMIM)

Force measurements with the atomic force microscope: Technique, interpretation and applications

High Density Single-Molecule-Bead Arrays for Parallel Single Molecule Force Spectroscopy

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