Influence of Relative Humidity of Storage Air on the Adhesion and Autoadhesion of Micronized Particles to Particulate and Compacted Powder Surfaces

Podczeck, Fridrun; Newton, John; James, Michael B.

doi:10.1006/jcis.1996.4684

Cited by 86 publications

(51 citation statements)

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“…This is especially useful in the case of irregular shaped particles where the contact area and adhesion force depends on the random orientation of the particles relative to the surface. Therefore, the centrifuge technique has been used to characterize the behavior of industrial powders in pharmaceutical [583][584][585][586][587][588][589] or food applications [590]. There are, however, also disadvantages of this technique.…”

Section: Particle Adhesionmentioning

confidence: 99%

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

Butt

Cappella

Kappl

2005

Surface Science Reports

3,151

2,949

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Section: Particle Adhesionmentioning

confidence: 99%

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

Butt

Cappella

Kappl

2005

Surface Science Reports

3,151

2,949

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“…The influence of relative humidity (RH) on adhesion force is discussed by Harriman and Simkins [185] and Bracken [42,44,46,48,[186][187][188]. The significance of air humidity in powder processing is stressed by Harnby et al [189].…”

Section: Influence Of Humidity On Adhesionmentioning

confidence: 99%

“…It is well known that humidity influences the cohesion in powders and the adhesion of particles to surfaces [44][45][46][47][48]. One reason is certainly the meniscus force.…”

Section: Introductionmentioning

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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“…The centrifuge technique employed by Zimon [10] has been used with good effect by Podczeck et al [11,12,13] to study the effect of relative humidity on the adhesion of pharmaceutical powders to various surfaces. In general, their findings were specific to each system studied, which were by nature very complex; their irregularly shaped particles ranged from hydrophobic to hydrophilic, with varying degrees of solubility.…”

Section: A Historical Perspective Of Experimental Studiesmentioning

confidence: 99%

The Influence of Relative Humidity on Particle Adhesion – a Review of Previous Work and the Anomalous Behaviour of Soda-lime Glass

Cleaver

Tyrrell

2004

KONA

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Influence of Relative Humidity of Storage Air on the Adhesion and Autoadhesion of Micronized Particles to Particulate and Compacted Powder Surfaces

Cited by 86 publications

References 13 publications

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

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

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

The Influence of Relative Humidity on Particle Adhesion – a Review of Previous Work and the Anomalous Behaviour of Soda-lime Glass

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