Graphite Particle Adhesion to Hastelloy X: Measurements of the Adhesive Force with an Atomic Force Microscope

Mokgalapa, Naphtali M.; Ghosh, Tushar K.; Loyalka, Sudarshan K.

doi:10.13182/nt13-9

Cited by 22 publications

(12 citation statements)

References 7 publications

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“…Still, direct measurements are essential when investigating the actual interactions between nuclear carbonaceous dust particles and the substrate wall in reactor cores. The present work closely follows the work of Mokgalapa et al (2014) using an AFM to measure the adhesive force, F ad . Three different carbonaceous particles, mesophase microbeads (MCMB), fuel element debris from HTR-10 and graphite NBG18 dust, were chosen as real particle samples.…”

Section: Introductionmentioning

confidence: 93%

“…However, the JKR model is still the most widely used theoretical model for the adhesive forces on account of its direct physical expression. The JKR model predictions always used for comparisons in surface forces (Mokgalapa et al, 2014;Shui-Qing and Qiang, 2009;Jones et al, 2002;Meine et al, 2004;Schaefer et al, 1995).…”

Section: Adhesive Force Theoretical Modelmentioning

confidence: 99%

“…The process to make a "particle probe" followed the colloidal probe technique introduced by Ducker et al (1991) with reference to the work of Mokgalapa et al (2014) to use epoxy as the binder to stick the particles on the cantilever. The target particle sample for the "particle probe" was a single particle.…”

Section: Sample Preparationmentioning

confidence: 99%

“…The distribution of the adhesive force, F ad , is important along with the magnitude and the adhesion characteristics of carbonaceous particles. Mokgalapa et al (2014) studied the adhesion of a cluster of graphite particle using Atomic Force Microscopy (AFM) as the first reported AFM measurements of graphite dust particles on Hastelloy X, a typical alloy in Very High Temperature Gas-cooled Reactors. The Hastelloy X was preprocessed by oxidation with nanoscale roughness to study the effect of roughness on the adhesion.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

AFM measurements of adhesive forces between carbonaceous particles and the substrates

Zhang

Peng

Shen

et al. 2015

Nuclear Engineering and Design

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Section: Introductionmentioning

confidence: 93%

Section: Adhesive Force Theoretical Modelmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

AFM measurements of adhesive forces between carbonaceous particles and the substrates

Zhang

Peng

Shen

et al. 2015

Nuclear Engineering and Design

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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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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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Graphite Particle Adhesion to Hastelloy X: Measurements of the Adhesive Force with an Atomic Force Microscope

Cited by 22 publications

References 7 publications

AFM measurements of adhesive forces between carbonaceous particles and the substrates

AFM measurements of adhesive forces between carbonaceous particles and the substrates

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

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

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