Cavitation and the Interaction Between Macroscopic Hydrophobic Surfaces

Christenson, Hugo K.; Claesson, Per M.

doi:10.1126/science.239.4838.390

Cited by 433 publications

(320 citation statements)

References 15 publications

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“…This is with AFM [69,119,[190][191][192][193][194][195][196][197][198]. Many experiments showed a significant dependency of the adhesion force on the relative humidity [40,52,54,56,57,183]. A continuous increase humidity was, for example, observed for the interaction of a silicon nitride tip with mica [194], between silica particles [199], a silica particle and a silicon wafer [200], or between a silicon nitride tip and molybdenum trioxide [201].…”

Section: Influence Of Humidity On Adhesionmentioning

confidence: 92%

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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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Section: Influence Of Humidity On Adhesionmentioning

confidence: 92%

“…The reduced Laplace pressure in the meniscus and the surface tension of the liquid cause an attractive force [53]. Many experiments showed a significant dependency of the adhesion force on the vapor pressure [52,[54][55][56][57].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2006

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“…Estimations of the rate of cavitation result in much too low values. Upon separation such cavities have been observed [532][533][534].…”

Section: Hydrophobic Attractionmentioning

confidence: 97%

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

Butt

Cappella

Kappl

2005

Surface Science Reports

3,242

2,949

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“…[8][9][10][11][12][13][14] On the other hand, among mesoscopic-or macroscopic-sized hydrophobes, e.g., between two planar hydrophobic surfaces, hydrophobic interaction can be induced by dewetting transition or capillary cavitation, [15][16][17][18][19] or by the formation of vicinal microbubbles [20][21][22] and inverted clathratelike structures. 23,24 The crossover from molecular to macroscopic like hydrophobic interaction was predicted to occur at about 1 nm length scale of the size of hydrophobes.…”

Section: Introductionmentioning

confidence: 99%

Large-scale molecular-dynamics simulation of nanoscale hydrophobic interaction and nanobubble formation

Kondo

Yasuoka

Ebisuzaki

et al. 2005

The Journal of Chemical Physics

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We performed large-scale molecular-dynamics simulation of nanoscale hydrophobic interaction manifested by the formation of nanobubble between nanometer-sized hydrophobic clusters at constrained equilibrium. Particular attention is placed on the tendency of formation and stability of nanobubbles in between model nanoassemblies which are composed of hydrophobic clusters ͑or patches͒ embedded in a hydrophilic substrate. On the basis of physical behavior of nanobubble formation, we observed a change from short-range molecular hydrophobic interaction to midrange nanoscopic interaction when the length scale of hydrophobe approaches to about 1 nm. We investigated the behavior of nanobubble formation with several different patterns of nonpolar-site distribution on the nanoassemblies but always keeping a constant ratio of nonpolar to polar monomer sites. Dynamical properties of confined water molecules in between nanoassemblies are also calculated.

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Cavitation and the Interaction Between Macroscopic Hydrophobic Surfaces

Cited by 433 publications

References 15 publications

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

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

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

Large-scale molecular-dynamics simulation of nanoscale hydrophobic interaction and nanobubble formation

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