An enhanced centrifuge-based approach to powder characterization: Experimental and theoretical determination of a size-dependent effective Hamaker constant distribution

Thomas, Myles C.; Beaudoin, Stephen P.

doi:10.1016/j.powtec.2016.10.017

Cited by 9 publications

(4 citation statements)

References 34 publications

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“…Both filtration and centrifugation techniques are extensively used to separate the saturated materials from an aqueous solution. [9,10] These applications are still slow and need extra cost. [11] Magnetic biochar was developed in order to facilitate the separation of the saturated material from treated water, where four main techniques were reported in literature; impregnationpyrolysis, chemical co-precipitation, solvothermal and reductive co-precipitation methods.…”

Section: Introductionmentioning

confidence: 99%

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Easy Recovered Magnetic Bark Biochar for Methylene Blue Removal: Preparation Characterization and Adsorption Parameters Study

Zeghioud,

Mouhamadou

2023

ChemistrySelect

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In this study, two types of magnetic biochars (Magnetic Bark Biochar with protocol 1 (MBB1) and Magnetic Bark Biochar with protocol 2 (MBB2)) were synthesized using pristine poplar bark biochar (PBB) via co‐precipitation. The two prepared magnetic biochars were tested to investigate the aqueous methylene blue (MB) removal performances. MB dye was used as a common pollutant for biochar quality evaluation and the obtained performance in this work was compared with literature. Different analysis techniques such as Scanning Electron Microscope (SEM), Energy Dispersive X‐ray Spectroscopy (EDS), Brunauer‐Emmett‐Teller (BET), porosimetry, Raman spectrometry and Fourier Transform Infrared spectroscopy (FTIR) were used to characterize the obtained materials. Biochars have a microporous structure with an average pore diameter of less than 0.26 nm. Magnetization of bark biochar leads to a loss in specific surface area (from 263.45 m2/g for PBB to 39.22 and 73.02 m2/g for MBB1 and MBB2, respectively) and an increase in total porosity by 85.11 and 12.72 %, respectively. MB adsorption process on MBB1 and MBB2 was best described by the pseudo‐first‐order kinetic model (R2=0.98) and by pseudo‐second‐order kinetic model for PBB (R2=0.9). The Langmuir monolayer adsorption and Marczewski‐jaroniec (M‐J) models presented the best fit for both PBB and MBB2 showing favourable adsorption process. Based on maximum adsorption capacity (qm: 32.98 mg/g) and the highest R2 value (0.96), MBB1 adsorption isotherm was well described by Langmuir model. Isotherm study revealed that MBB2 has the highest adsorption capacity of 49.02 mg/g followed by PBB with 37.85 mg/g. MB‐biochar interactions are dominated by chemisorption regarding the PBB and by physisorption concerning the magnetic biochars.

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Section: Introductionmentioning

confidence: 99%

“…In addition, how to efficiently recover adsorbents from the aqueous medium is the second essential problematic to be treated. Both filtration and centrifugation techniques are extensively used to separate the saturated materials from an aqueous solution [9,10] . These applications are still slow and need extra cost [11] …”

Section: Introductionmentioning

confidence: 99%

Easy Recovered Magnetic Bark Biochar for Methylene Blue Removal: Preparation Characterization and Adsorption Parameters Study

Zeghioud,

Mouhamadou

2023

ChemistrySelect

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“…The centrifugal method is widely used as a simple and practical method for measuring the adhesion force between particles and substrates (Suzuki et al, 2013;Booth et al, 1987;Podczeck et al, 1996, Podczeck, 1999Thomas et al, 2015;Thomas et al, 2017). The adhesion force between the particle and surface of a test piece was measured using the centrifugal equipment shown in Figure 7.…”

Section: Centrifugal Methods For Measuring the Adhesion Forcementioning

confidence: 99%

Preventing nuclear fuel material adhesion on glove box components using nanoparticle coating

Segawa

Kawaguchi

Ishii

et al. 2021

Mechanical Engineering Journal

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Recently, studies have reported that a water-repellent coating can be created by applying nanoparticles to the surfaces of glass and polymer (Suzuki, 2007; Conti et al., 2018;Widati et al., 2019). In addition, studies suggest that a nanoparticle coating reduces, to approximately one-seventh, the adhesion force of alumina (Al2O3) particles to glass substrates, thereby providing a high adhesion-prevention effect (Suzuki et al., 2013). The nanoparticle coating also reduces the van der Waals force of adhesion due to the formation of nanoscale asperities on the surfaces of substrates and particles (Suzuki et al., 2013;Yang et al., 2005; Deng et al., 2017). The nanoparticles aggregating on the acrylic surface are smaller than the wavelength of visible light, and hence the transparency of the acrylic panel remains undiminished with the use of coatings

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“…Hamaker constant [6,32] is a simple empirical method for describing disjoining pressure on rough surfaces, which inherently assumes that surface roughness only affects the magnitude of the Hamaker constant, rather than affecting the disjoining pressure through a change in the inverse cubic relation with film thickness. However, there is no clear evidence supporting this approach for rough surfaces.…”

Section: A  =mentioning

confidence: 99%

Role of nanoscale roughness in the heat transfer characteristics of thin film evaporation

Weibel

Garimella

2020

International Journal of Heat and Mass Transfer

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Thin film evaporation yields high local heat fluxes that contributes significantly to the total heat transfer rate during various two-phase transport processes including pool boiling, flow boiling, and droplet evaporation, among others. Recent studies have shown a strong correlation between the roughness of a surface and its two-phase heat transfer characteristics, but the underlying role of nanoscale surface roughness in thin film evaporation is not fully understood. In the present work, a thin film evaporation model is developed that accounts for the role of the roughness-affected disjoining pressure and flow permeability in determining the film thickness profile and heat transfer rate. Nanoscale surface roughness leads to a flatter evaporating meniscus profile when the effect of disjoining pressure is more pronounced of the two and promotes evaporation, consistent with previous experimental observations. However, our results reveal that surface roughness may also inhibit evaporation and lead to a steeper evaporating meniscus profile when flow permeability has the more pronounced influence on thin film evaporation. It is important to identify the specific surface roughness characteristics that determine whether disjoining pressure or flow permeaiblity has the stronger influence. To this end, a parametric study is performed that analyzes thin film evaporation on V-grooved surfaces of different depths and pitches. While the heat transfer rate increases monotonically with groove depth, there exists an optimal groove pitch that leads to a maximized evaporation rate. Also, when the groove pitch is smaller than a critical value, surface roughness inhibits thin film evaporation.

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An enhanced centrifuge-based approach to powder characterization: Experimental and theoretical determination of a size-dependent effective Hamaker constant distribution

Cited by 9 publications

References 34 publications

Easy Recovered Magnetic Bark Biochar for Methylene Blue Removal: Preparation Characterization and Adsorption Parameters Study

Easy Recovered Magnetic Bark Biochar for Methylene Blue Removal: Preparation Characterization and Adsorption Parameters Study

Preventing nuclear fuel material adhesion on glove box components using nanoparticle coating

Role of nanoscale roughness in the heat transfer characteristics of thin film evaporation

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