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Tselishchev, Yu. G.; Вальцифер, В. А.

doi:10.1023/a:1024275327145

Cited by 45 publications

(28 citation statements)

References 2 publications

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“…It means that the observed repulsive residual force in the previous relaxation tests 1) is possibly attributed to the repulsive capillary force. As we detected the possibility of repulsive capillary forces in a concave liquid bridge, already noticed in literature in both theoritical [4][5][6][7][8] and experimental approaches.…”

Section: )supporting

confidence: 73%

Repulsive Capillary Force between two Plates Linked by a Concave Molten Slag Bridge

2009

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In the previous papers, 1,2) the relaxation tests of molten alumonosilicate slags were carried out to evaluate the mechanical properties of molten slags. Namely, molten slag (35mass%CaO-35mass%SiO 2 -30mass%Al 2 O 3 ) drop of about 0.05 g was kept at 1 723 K between two Pt disks (6.5 mm dia.) and then was compressed at various compression rates until particular displacement distance, then the compression process was stopped and the stress relaxation with time was measured. The details of the experiment can be found elsewhere.1) The observed typical stress relaxation test is shown in Fig. 1. The stress relaxation curve was consisted of 3 stages. The force became maximum at maximum stress (Stage I). After this, the force decreased sharply (Stage II). Then the force was decreased gradually and asymptotically approached to the constant value (Stage III). Intriguingly, the molten slag showed the existence of the repulsive residual force even without the compression force.In the previous paper, 1) we supposed that the origin of this residual force was due to the structural rearrangement difficulty of the aluminosilicate molten slags. Namely the original structure of slags was changed to differently configurated structure during the compression process. After the elimination of compress force, it tried to return to the originally configurated structure. The structural relaxation should to involve breaking and making of the bonds between ions or silicate and aluminate units. The bending or distortion of silicate or aluminate units can be easily restored to the original state, however, the whole structural rearrangement among silicate and alumina units by the interatomic or intermolecular breaking and making of bonds can be difficult. Thus, the deformed structure may stay at the meta-stable configurated structure. This meta-stable structure could possess higher energy than that of original structure. This causes the repulsive residual forces. Now we realize, however, that the meta-stable structure may not the main reason of the repulsive force.Initially we excluded the effect of surface tension because the molten slags after the compression showed the concave liquid bridge as shown in Fig. 2. Generally speaking, two wetted surfaces can stick together with great strength if the liquid wets them with an angle qϽp/2. The q angle is defined in Fig. 3. Namely, the existence of the concave liquid bridge between two plates suggests the attractive force between two plates. The Laplace pressure within liquid bridge between wetted two plates can be ex- (1) where q is the wetting angle, g is the surface free energy, H is the plate to plate distance, and R is the radius of the liquid bridge, and all these parameters are shown in Fig. 3 As long as qϽp/2, DP can be negative or the force F between the plates can be attractive and the force can be expressed by Vol. 49 (2009), No. 11, pp. 1814-1815 Note Fig. 1. Schematic description of stress relaxation curve for the molten aluminosilicate slag.

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Section: )supporting

confidence: 73%

Repulsive Capillary Force between two Plates Linked by a Concave Molten Slag Bridge

2009

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“…Therefore, an alternative modelling approach has been taken. We consider the toroidal approximation in which the liquid-vapor interface on the axi-symmetrical planes is approximated by a circular arc with radius, r [60][61][62]. The two principal radii, r and l, of interface curvature can be determined by considering the simple geometry associated with the arc and the particle surface, giving (Fig.…”

Section: Theoretical Analysis Of Attraction By Nanobubblesmentioning

confidence: 99%

Effect of alcohol–water exchange and surface scanning on nanobubbles and the attraction between hydrophobic surfaces

Hampton

Donose

Nguyen

2008

Journal of Colloid and Interface Science

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“…For a rotational symmetric geometry the meniscus force is [120] (for an overview see refs. [130], [131] )…”

Section: Calculation Of Meniscus Force For Fundamental Geometriesmentioning

confidence: 99%

“…For a cone of half opening angle ϕ interacting with a smooth plane the meniscus force was calculated with [148] …”

Section: Calculation Of Meniscus Force For Fundamental Geometriesmentioning

confidence: 99%

On the Adhesion between Fine Particles and Nanocontacts: An Atomic Force Microscope Study

et al. 2006

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To optimize the handling of fine powders in industrial applications, understanding the interaction forces between single powder particles is fundamental. The forces between colloidal particles dominate the behavior of a great variety of materials, including paints, paper, soil, and many industrial processes. With the invention of the atomic force microscope (AFM), the direct measurement of the interaction between single micron-sized particles became possible. The adhesional contact between a particle and a substrate is a parameter for analyzing pull-off force data generated by AFM. The aim of this study was to understand surface interactions between fine particles. I measured the adhesion forces between AFM tips or particles attached to AFM cantilevers and different solid samples. Smooth and homogeneous surfaces such as silicon wafer, mica, or highly oriented pyrolytic graphite (HOPG), and more rough and heterogeneous surfaces such as iron particles or patterns of TiO 2 nanoparticles on silicon wafer were used. First, I addressed to the wellknown issue that AFM adhesion experiment results show wide distributions of adhesion forces rather than a single value. My experimental results show that variations in adhesion forces comprise fast (i.e., from one force curves to the next) random fluctuations and slower fluctuations, which occur over tens or hundreds of consecutive measurements. Slow fluctuations are not likely to be the result of variations in external factors such as lateral position, temperature, humidity, and so forth because those were kept constant. Even if two solid bodies are brought into contact under precisely the same conditions (same place, load, direction, etc.) the result of such a measurement will often not be the same as for the previous contact. The measurement itself will induce structural changes in the contact region which can change the value for the next adhesion force measurement.In the second part I studied the influence of humidity on the adhesion of nanocontacts. Humidity was adjusted relatively fast to minimize tip wear during one experiment. For hydrophobic surfaces, no signification change of adhesion force with humidity was observed. Adhesion force-versus-humidity curves recorded with hydrophilic surfaces either showed a maximum or continuously increased. I demonstrate that the results can be interpreted with simple continuum theory of the meniscus force. The meniscus force is calculated based on a model that includes surface roughness and takes into account different AFM tip (or particle) shapes by a two-sphere-model.Experimental and theoretical results show that the precise contact geometry has a critical influence on the humidity dependence of the adhesion force.Changes of tip geometry on the sub-10-nm length scale can completely change adhesion force-versus-humidity curves. Our model can also explain the differences between earlier AFM studies, where different dependencies of the adhesion force on humidity were observed.Keywords: Atomic force microscopy (AFM), cantile...

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Untitled

Cited by 45 publications

References 2 publications

Repulsive Capillary Force between two Plates Linked by a Concave Molten Slag Bridge

Repulsive Capillary Force between two Plates Linked by a Concave Molten Slag Bridge

Effect of alcohol–water exchange and surface scanning on nanobubbles and the attraction between hydrophobic surfaces

On the Adhesion between Fine Particles and Nanocontacts: An Atomic Force Microscope Study

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