Effect of Capillary Force on Friction Force Microscopy : A Scanning Hydrophilicity Microscope

Fujihira, Masamichi; Aoki, Daisuke; Okabe, Yoh; Takano, Hajime; Hokari, Hirofumi; Frommer, Jane; Nagatani, Yasunori; Sakai, Fumiki

doi:10.1246/cl.1996.499

Cited by 74 publications

(51 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Water condenses into the gap at the contact region between hydrophilic particles. 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].…”

Section: Influence Of Humidity On Adhesionmentioning

confidence: 91%

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

et al. 2006

View full text Add to dashboard Cite

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...

show abstract

Section: Influence Of Humidity On Adhesionmentioning

confidence: 91%

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

et al. 2006

View full text Add to dashboard Cite

show abstract

“…The different dependence of meniscus force on relative humidity for hydrophilic and for hydrophobic substrates has been addressed by Fujihira et al [105]. The authors study the adhesion force on a Si substrate partially covered with a hydrocarbon monolayer.…”

Section: Noise and Systematic Errorsmentioning

confidence: 99%

Force-distance curves by atomic force microscopy

Cappella

Dietler

1999

Surface Science Reports

1,485

1,025

View full text Add to dashboard Cite

“…Surfaces oxidized by voltages as low as 7 V exhibit a frictional force larger than that oxidized by voltages higher than 8 V, where the frictional force was measured by AFM as a magnitude of cantilever torsion during the scan [22]. Frictional force measured by * Corresponding author: togino@ynu.ac.jp AFM in air is generally determined by the meniscus force between the surface and the hydrophilic cantilever [23][24][25][26]. Water molecules of the meniscus attract each other and prevent cantilever motion.…”

Section: Introductionmentioning

confidence: 99%

Selective Deposition of Lipid Membranes on Locally Anodic-Oxidized Silicon Surface

Nakamura

Isono

Ogino

2011

e-J. Surf. Sci. Nanotechnol.

View full text Add to dashboard Cite

We demonstrate control of biomolecule adsorption on Si oxide islands formed by local anodic oxidation using atomic force microscopy. Local anodic oxidation was performed on a thin-SiO2/Si substrate covered with an octadecyltrimethoxysilane (OTMS) film. Dipalmitoylphosphatidylcholine (DPPC) molecules were deposited on the oxide islands. Hydrophilicity of the oxide island surfaces decreased with an increase in the applied voltage. When high voltages were applied, the oxide islands laterally expanded to form round shape and more hydrophilic oxide areas formed in the periphery of the islands. Density of OH groups on the anodic oxide island surface, which determines the surface hydrophilicity, is changed by the applied voltage during the oxidation. Since lipid membrane formation is strongly affected by surface hydrophilicity, selective deposition of DPPC membranes was achieved. We concluded that local anodic oxidation is a useful method for controlling biomolecule adsorption through oxide surfaces with variable hydrophilicity.

show abstract

Effect of Capillary Force on Friction Force Microscopy : A Scanning Hydrophilicity Microscope

Cited by 74 publications

References 13 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-distance curves by atomic force microscopy

Selective Deposition of Lipid Membranes on Locally Anodic-Oxidized Silicon Surface

Contact Info

Product

Resources

About