Adhesion of a plastic particle to a substrate upon high-speed collision: a theoretical model

Uryukov, B. A.; Tkachenko, Georgiy

doi:10.1007/s11106-009-9115-x

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…As a result, the AgNPs deposited on the substrate may have been redistributed by this expected particle bounce. Only large aggregate AgNPs, which have a higher adhesion force due to the higher contact area between a particle and a substrate 44 , may remain deposited. Using the two suspension concentrations and DMA, we fabricated aggregates of four different sizes: 48, 86, 151 and 218 nm.…”

Section: Resultsmentioning

confidence: 99%

Development of spray-drying-based surface-enhanced Raman spectroscopy

Matsumoto

Gen

Matsuki

et al. 2022

Sci Rep

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We report a spray-drying method to fabricate silver nanoparticle (AgNP) aggregates for application in surface-enhanced Raman spectroscopy (SERS). A custom-built system was used to fabricate AgNP aggregates of four sizes, 48, 86, 151, and 218 nm, from drying droplets containing AgNPs atomized from an AgNP suspension. Sample solutions of Rhodamine B (RhB) at 10–6, 10–8, and 10–10 M concentrations were dropped onto the AgNP aggregates as probe molecules to examine the enhancement of the Raman signals of the RhB. The ordering of the analytical enhancement factors (AEFs) by aggregate size at a 10–6 M RhB was 86 nm > 218 nm > 151 nm > 48 nm. When RhB concentrations are below 10–8 M, the 86 and 151 nm AgNP aggregates show clear RhB peaks. The AEFs of the 86 nm AgNP aggregates were the highest in all four aggregates and higher than those of the 218-nm aggregates, although the 218-nm aggregates had more hot spots where Raman enhancement occurred. This finding was attributable to the deformation and damping of the electron cloud in the highly aggregated AgNPs, reducing the sensitivity for Raman enhancement. When RhB was premixed with the AgNP suspension prior to atomization, the AEFs at 10–8 M RhB rose ~ 100-fold compared to those in the earlier experiments (the post-dropping route). This significant enhancement was probably caused by the increased opportunity for the trapping of the probe molecules in the hot spots.

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Section: Resultsmentioning

confidence: 99%

Development of spray-drying-based surface-enhanced Raman spectroscopy

Matsumoto

Gen

Matsuki

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…As a result, the AgNPs deposited on the substrate may have been redistributed by this expected particle bounce. Only large aggregate AgNPs, which have a higher adhesion force due to the higher contact area between a particle and a substrate 41 , may remain deposited. Using the two suspension concentrations and DMA, we fabricated aggregates of three different sizes: 48, 86, and 218 nm.…”

Section: Resultsmentioning

confidence: 99%

Spray-Drying-Based Surface-Enhanced Raman Spectroscopy: Effect of the Silver Nanoparticle Aggregate Size on the Enhancement of Raman Scattering

Matsumoto

Gen

Matsuki

et al. 2021

Preprint

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We report a spray-drying method to fabricate silver nanoparticle (AgNP) aggregates for application in surface-enhanced Raman spectroscopy (SERS). A custom-built system was used to fabricate AgNP aggregates of three sizes, 48, 86, and 218 nm, from drying droplets containing AgNPs atomized from an AgNP suspension. Sample solutions of Rhodamine B (RhB) at 10–6, 10–8, and 10–10 M concentrations were dropped onto the AgNP aggregates as probe molecules to examine the enhancement of the Raman signals of the RhB. The ordering of the analytical enhancement factors (AEFs) by aggregate size at a given RhB concentration was 86 nm > 218 nm > 48 nm. The AEFs of the 86 nm AgNP aggregates were higher than those of the 218-nm aggregates, although the 218-nm aggregates had more hot spots where Raman enhancement occurred. This finding was attributable to the deformation and damping of the electron cloud in the highly aggregated AgNPs, reducing the sensitivity for Raman enhancement. When RhB was premixed with the AgNP suspension prior to atomization, the AEFs at 10–8 M RhB rose ~100-fold compared to those in the earlier experiments (the post-dropping route). This significant enhancement was probably caused by the increased opportunity for the trapping of the probe molecules in the hot spots.

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The dynamic effect on mechanical contacts between nanoparticles

Sun

2013

Nanoscale

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The rich behaviors of high-speed mechanical contacts at the nanoscale have been studied. The seldom observed elastic-plastic transition governed by Hertz and Thornton models has been clearly unveiled, the origins of the hardening effect and the deformation mechanism of nanoscale plasticity have been discussed in terms of structural changes after compression and a series of physical quantities are measured including contact forces, contact radius, contact stress, coefficient of restitution and total impact time. Our simulation results closely resemble experiments and/or theoretical predictions: (i) when impact speed v is higher than Y/ρc0, the elastic-plastic deformation transition occurs, (ii) the yielded apparent elastic modulus and hardness are larger than those of the bulk, (iii) the initiating yield stress Y and hardness P0 still satisfy P0 ≈ 1.6Y, (iv) particle's volume decreases during compression, (v) contact radius a follows a [proportionality] v(2/5), (vi) at v ≥ 2000 m s(-1), the coefficient of restitution follows e [proportionality] v(-1/4) and (vii) the total time of impact follows Tc [proportionality] v(-1/5). However, there also exist many quantitative differences. The contact radius and final contact radius are underestimated by the continuum predictions while the total impact time is overestimated, but all of them reasonably agree with theoretical predictions with an increase of contact area and impact speed. The theoretical equation is adapted to predict the final contact radius during normal impact, in which the contact radius at zero load is also formulated.

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Adhesion of a plastic particle to a substrate upon high-speed collision: a theoretical model

Cited by 4 publications

References 2 publications

Development of spray-drying-based surface-enhanced Raman spectroscopy

Development of spray-drying-based surface-enhanced Raman spectroscopy

Spray-Drying-Based Surface-Enhanced Raman Spectroscopy: Effect of the Silver Nanoparticle Aggregate Size on the Enhancement of Raman Scattering

The dynamic effect on mechanical contacts between nanoparticles

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