Direct Measurement of Repulsive van der Waals Interactions Using an Atomic Force Microscope

Milling, Andrew; Mulvaney, Paul; Larson, Ian

doi:10.1006/jcis.1996.0326

Cited by 168 publications

(174 citation statements)

References 5 publications

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“…In Refs. [31][32][33][34][35][36] QED Casimir repulsion has indeed been observed experimentally for the sphere-plate geometry. In order to minimize the potential negative effects of all possible circuitry at such a small distances and the complications with the isolation, as well as possible problems involving chemical reactions it seems that one promising strategy for overcoming the obstacles mentioned above is to choose such a fluid as a medium that possesses no free changes dissolved in it and that is inert and do not interact chemically with the materials.…”

Section: Introductionmentioning

confidence: 92%

Sign change in the net force in sphere-plate and sphere-sphere systems immersed in nonpolar critical fluid due to the interplay between the critical Casimir and dispersion van der Waals forces

Valchev

Dantchev

2017

Phys. Rev. E

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We study systems in which both long-ranged van der Waals and critical Casimir interactions are present. The last arise as an effective force between bodies when immersed in a near-critical medium, say a nonpolar onecomponent fluid or a binary liquid mixture. They are due to the fact that the presence of the bodies modifies the order parameter profile of the medium between them as well as the spectrum of its allowed fluctuations. We study the interplay between these forces, as well as the total force (TF) between a spherical colloid particle and a thick planar slab, and between two spherical colloid particles. We do that using general scaling arguments and mean-field type calculations utilizing the Derjaguin and the surface integration approaches. They both are based on data of the forces between two parallel slabs separated at a distance L from each other, confining the fluctuating fluid medium characterized by its temperature T and chemical potential µ. The surfaces of the colloid particles and the slab are coated by thin layers exerting strong preference to the liquid phase of the fluid, or one of the components of the mixture, modeled by strong adsorbing local surface potentials, ensuring the socalled (+, +) boundary conditions. On the other hand, the core region of the slab and the particles, influence the fluid by long-ranged competing dispersion potentials. We demonstrate that for a suitable set of colloids-fluid, slab-fluid, and fluid-fluid coupling parameters the competition between the effects due to the coatings and the core regions of the objects involved result, when one changes T , µ or L, in sign change of the Casimir force (CF) and the TF acting between the colloid and the slab, as well as between the colloids. This can be used for governing the behavior of objects, say colloidal particles, at small distances, say in colloid suspensions for preventing flocculation. It can also provide a strategy for solving problems with handling, feeding, trapping and fixing of microparts in nanotechnology. Data for specific substances in support of the experimental feasibility of the theoretically predicted behavior of the CF and TF have been also presented.

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Section: Introductionmentioning

confidence: 92%

Sign change in the net force in sphere-plate and sphere-sphere systems immersed in nonpolar critical fluid due to the interplay between the critical Casimir and dispersion van der Waals forces

Valchev

Dantchev

2017

Phys. Rev. E

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“…The advent of new measurement tools, such as atomic force microscopy in colloidal probe mode, has opened up the possibility of conducting such measurements. Although several studies have been reported recently, 24,73,[153][154][155][156][157] this remains a wide-open research area. Particular emphasis should be directed toward the interaction between tailored particle interfaces.…”

Section: Future Directionsmentioning

confidence: 99%

Colloidal Processing of Ceramics

Lewis

2000

Journal of the American Ceramic Society

1,205

640

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Colloidal processing of ceramics is reviewed with an emphasis on interparticle forces, suspension rheology, consolidation techniques, and drying behavior. Particular attention is given to the scientific concepts that underpin the fabrication of particulate-derived ceramic components. The complex interplay between suspension stability and its structural evolution during colloidal processing is highlighted.

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“…The theory has been verified in several high precision experiments, and although the investigation has been mainly focused on the interaction between metallic surfaces in vacuum, there are no doubts about its general validity [11,12,13,14,15,16,17,18,19] (for a review of previous measurements, see [8,20]; for a critical discussion on the precision of the most recent experiments, see [21,22,23,24]). Less precise measurements in liquids have been reported [8,25,26], and experimental evidence for repulsive van der Waals forces between dielectric surfaces in different fluids has also been reported [27,28,29]. Finally, it has been pointed out that the Casimir-Lifshitz force might be a potentially relevant issue for the development of micro-and nanoelectromechanical systems [11,30,31].…”

mentioning

confidence: 99%

Torque on birefringent plates induced by quantum fluctuations

et al. 2005

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We present detailed numerical calculations of the mechanical torque induced by quantum fluctuations on two parallel birefringent plates with in plane optical anisotropy, separated by either vacuum or a liquid (ethanol). The torque is found to vary as sin (2θ), where θ represents the angle between the two optical axes, and its magnitude rapidly increases with decreasing plate separation d. For a 40 µm diameter disk, made out of either quartz or calcite, kept parallel to a Barium Titanate plate at d ≃ 100 nm, the maximum torque (at θ = π 4 ) is of the order of ≃ 10 −19 N·m. We propose an experiment to observe this torque when the Barium Titanate plate is immersed in ethanol and the other birefringent disk is placed on top of it. In this case the retarded van der Waals (or Casimir-Lifshitz) force between the two birefringent slabs is repulsive. The disk would float parallel to the plate at a distance where its net weight is counterbalanced by the retarded van der Waals repulsion, free to rotate in response to very small driving torques.

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Direct Measurement of Repulsive van der Waals Interactions Using an Atomic Force Microscope

Cited by 168 publications

References 5 publications

Sign change in the net force in sphere-plate and sphere-sphere systems immersed in nonpolar critical fluid due to the interplay between the critical Casimir and dispersion van der Waals forces

Sign change in the net force in sphere-plate and sphere-sphere systems immersed in nonpolar critical fluid due to the interplay between the critical Casimir and dispersion van der Waals forces

Colloidal Processing of Ceramics

Torque on birefringent plates induced by quantum fluctuations

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