AFM measurements of adhesive forces between carbonaceous particles and the substrates

Zhang, Tianqi; Peng, Wei; Shen, Ke; Yu, Suyuan

doi:10.1016/j.nucengdes.2015.06.022

Cited by 22 publications

(17 citation statements)

References 39 publications

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“…Table 4 shows the some related adhesion measurement on graphite particles from different contact wall. Consistent with the results of some previous adhesion experiments (Mokgalapa et al, 2014;Zhang et al, 2015), the measured adhesion force is significantly less than two orders of magnitude compared with the JKR theoretical model due to roughness and non-spherical particle effect in experiment condition.…”

Section: Adhesive Force Measurementsupporting

confidence: 89%

Study of the deposition of graphite dust in the inlet passageway of intermediate heat exchanger in VHTR

Sun

Xiao

Wang

et al. 2019

Exp. Comput. Multiph. Flow

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The impact of graphite dust on structural equipment is a potential safety hazard in HTGR. The present study focuses on the graphite particle deposition process on the deflector in the inlet passageway of intermediate heat exchanger and analyzes the effect of particle size on inertial deposition and diffusion deposition. Meanwhile, the particle rebound behavior is considered when the particle impacts the wall. To determine the relevant parameters of the rebound model, the experiments about adhesion are carried out and validated. Then the flow field is simulated in the inlet passageway of intermediate heat exchanger based on k-ε turbulent model, and particle trajectories are predicted by a discrete particle model with rebound boundary. The results show that adhesion force by measures is obviously smaller than theoretical model. In addition, the particle deposition rate decreases first and then increases, and the rebound model makes deposition results more actual.

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Section: Adhesive Force Measurementsupporting

confidence: 89%

Study of the deposition of graphite dust in the inlet passageway of intermediate heat exchanger in VHTR

Sun

Xiao

Wang

et al. 2019

Exp. Comput. Multiph. Flow

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“…Nevertheless, only few work have been initiated to evaluate the adhesion force with AFM technique between relevant dusts and surfaces one can find in nuclear fusion facilities. To our knowledge, only few studies (Mokgalapa et al [2014], Zhang et al [2015]) between graphene particles with complex geometry and different types of surfaces found in High Temperature Reactors (HTR) have been performed so far with AFM.…”

Section: Introductionmentioning

confidence: 99%

Adhesion of tungsten particles on rough tungsten surfaces using Atomic Force Microscopy

Peillon

Autricque

Rédolfi

et al. 2019

Journal of Aerosol Science

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Adhesion forces between tungsten spherical microparticles and tungsten substrates with different roughnesses have been measured using the Atomic Force Microscopy (AFM) colloidal probe technique. Mean roughnesses of the tungsten substrates were measured by AFM and were ranked in three categories i.e. nanoscale, sub-microscale and microscale roughnesses. Experimental Hamaker constant of 37 ± 3.5 × 10 −20 J has been obtained using a spherical tungsten particle of 10.5 µm in radius and a tungsten substrate with nanoscale root-mean-square roughness of rms = 11.5 nm. It was shown that larger roughness of the order rms = 712 nm induces a two order of magnitude decrease on the adhesion of tungsten microparticles compared to a smooth tungsten surface with nanoscale roughness. Comparison with the van der Waals-based adhesion force model of Rabinovich which integrates the roughness of surfaces showed good agreement with experimental pull-off forces even when roughness of the substrate is close to the micrometer range. In such case, measurements have shown that dependency of adhesion force with particle size (in the micrometer range) has a secondary influence compared to the roughness of surfaces.

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“…The particle probe preparation followed the procedure described by Moutinho et al and is detailed in the Supporting Information (SI). ,, …”

Section: Methodsmentioning

confidence: 99%

“…Particles are deposited by falling onto surfaces and can be carried by wind or water droplets. After settling, particles may be held by capillary effects, gravity, and van der Waals and electrostatic forces, which are all a function of particle properties. , The soiling potential of each particle depends on size, density, shape, composition, chemistry, charge, and environmental conditions such as wind, humidity, and temperature. ,,, Previous studies have considered, from a general perspective, the forces responsible for particle adhesion. ,,− At short distances, particle-surface properties control van der Waals interactions, while relative humidity levels and hydrophobicity determine the capillary forces. ,, In comparison, electrostatic forces may be stronger and appear at much longer distances. They are expected to be present while solar panels are operated, and their strength could overcome both van der Waals and capillary forces .…”

Section: Introductionmentioning

confidence: 99%

Effect of Dust Composition on the Reversibility of Photovoltaic Panel Soiling

Varga

Wiesner

2021

Environ. Sci. Technol.

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Eight types of common airborne particles were used to investigate whether the composition of dust influences its soiling potential on photovoltaic panels. Chosen model particles were roughly spherical, 10−30 μm in diameter to minimize the differences in size and shape. While the predicted van der Waals forces were lower than the adhesion forces measured with an atomic force microscope (AFM), the adhesion potential as a function of surface energy did follow the theoretical pattern. The organic and carbon-based materials, namely the pollen grains and spherical graphite, exhibited a significantly larger adhesion force to the glass surface, indicating high attachment efficiency. The developed generalized linear model confirmed that the type of material should be included in soiling models as a variable, as it provides information on the likelihood of particles sticking to and remaining on the surface. The adhesion force between soiled particles and the surface can be estimated based on the local ambient dust composition to predict the short-term fate of the depositing particles and develop cleaning schedules and techniques accordingly. The results also highlight the need to study dust composition to understand long-term soiling, where chemical characteristics and changing environmental conditions may lead to cementation.

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AFM measurements of adhesive forces between carbonaceous particles and the substrates

Cited by 22 publications

References 39 publications

Study of the deposition of graphite dust in the inlet passageway of intermediate heat exchanger in VHTR

Study of the deposition of graphite dust in the inlet passageway of intermediate heat exchanger in VHTR

Adhesion of tungsten particles on rough tungsten surfaces using Atomic Force Microscopy

Effect of Dust Composition on the Reversibility of Photovoltaic Panel Soiling

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