Coupled effect of concentration, particle size and substrate morphology on the formation of coffee rings

Lohani, Deepa; Basavaraj, Madivala G.; Satapathy, Dillip K.; Sarkar, Sagar

doi:10.1016/j.colsurfa.2019.124387

Cited by 30 publications

(42 citation statements)

References 33 publications

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“…In SEM images the plastic particles are observed to be distributed on the substrates following the “coffee-ring” effect ( Figure A3 ); with a more homogenous layer of plastic particles present at the center of the dried sample drop surrounded by a ring of particle buildup. This was observed for all particles, down to the lowest concentrations studied and is an effect that has been studied extensively in the literature [ 29 , 30 , 31 ].…”

Section: Resultsmentioning

confidence: 57%

“…For PS, key peaks of interest are present as a result of ring breathing vibrations (i.e., v(C–C) near 1002 cm −1 and β(C–H) near 1032 cm −1 ) of the benzenes within the polymer backbone [ 16 ]. Key peaks of interest for PET are known to be present at 1615–1620 cm −1 and 1730 cm −1 as a result of the ring breathing and carbonyl stretching, respectively [ 9 , 31 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

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Detection of Sub-Micro- and Nanoplastic Particles on Gold Nanoparticle-Based Substrates through Surface-Enhanced Raman Scattering (SERS) Spectroscopy

et al. 2021

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Small plastic particles such as micro- (<5 mm), sub-micro- (1 µm–100 nm) and nanoplastics (<100 nm) are known to be ubiquitous within our surrounding environment. However, to date relatively few methods exist for the reliable detection of nanoplastic particles in relevant sample matrices such as foods or environmental samples. This lack of relevant data is likely a result of key limitations (e.g., resolution and/or scattering efficiency) for common analytical techniques such as Fourier transform infrared or Raman spectroscopy. This study aims to address this knowledge gap in the field through the creation of surface-enhanced Raman scattering spectroscopy substrates utilizing spherical gold nanoparticles with 14 nm and 46 nm diameters to improve the scattering signal obtained during Raman spectroscopy measurements. The substrates are then used to analyze polystyrene particles with sizes of 161 nm or 33 nm and poly(ethylene terephthalate) particles with an average size of 62 nm. Through this technique, plastic particles could be detected at concentrations as low as 10 µg/mL, and analytical enhancement factors of up to 446 were achieved.

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Section: Resultsmentioning

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Detection of Sub-Micro- and Nanoplastic Particles on Gold Nanoparticle-Based Substrates through Surface-Enhanced Raman Scattering (SERS) Spectroscopy

et al. 2021

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“…The bright birefringence pattern of the nanocrystals with the main dendritic morphology was observed after the dispersion droplets were cast and evaporated at 60 °C for 60 s ( Figure 7 B,C). Meanwhile, an obvious coffee ring was more proof that the self-assembly of CS-TA-Na nanocrystals was influenced by fluid mechanical effects [ 33 ].…”

Section: Resultsmentioning

confidence: 99%

Facile and Scalable Synthesis and Self-Assembly of Chitosan Tartaric Sodium

et al. 2021

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Chitosan-based nanostructures have been widely applied in biomineralization and biosensors owing to its polycationic properties. The creation of chitosan nanostructures with controllable morphology is highly desirable, but has met with limited success yet. Here, we report that nanostructured chitosan tartaric sodium (CS-TA-Na) is simply synthesized in large amounts from chitosan tartaric ester (CS-TA) hydrolyzed by NaOH solution, while the CS-TA is obtained by dehydration-caused crystallization. The structures and self-assembly properties of CS-TA-Na are carefully characterized by Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (1H-NMR), X-ray diffraction (XRD), differential scanning calorimeter (DSC), transmission electron microscopy (TEM), a scanning electron microscope (SEM) and a polarizing optical microscope (POM). As a result, the acquired nanostructured CS-TA-Na, which is dispersed in an aqueous solution 20–50 nm in length and 10–15 nm in width, shows both the features of carboxyl and amino functional groups. Moreover, morphology regulation of the CS-TA-Na nanostructures can be easily achieved by adjusting the solvent evaporation temperature. When the evaporation temperature is increased from 4 °C to 60 °C, CS-TA-Na nanorods and nanosheets are obtained on the substrates, respectively. As far as we know, this is the first report on using a simple solvent evaporation method to prepare CS-TA-Na nanocrystals with controllable morphologies.

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“…As the particles tend to agglomerate during static deposition [8,9] leading to the well-known “coffee-ring effect” [10], a strategy must be deployed to avoid this phenomenon. Thus, a spin-coating deposition method was used [11].…”

Section: Methodsmentioning

confidence: 99%

Correlation of AFM/SEM/EDS Images to Discriminate Several Nanoparticle Populations Mixed in Cosmetics

et al. 2021

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Coupled effect of concentration, particle size and substrate morphology on the formation of coffee rings

Cited by 30 publications

References 33 publications

Detection of Sub-Micro- and Nanoplastic Particles on Gold Nanoparticle-Based Substrates through Surface-Enhanced Raman Scattering (SERS) Spectroscopy

Detection of Sub-Micro- and Nanoplastic Particles on Gold Nanoparticle-Based Substrates through Surface-Enhanced Raman Scattering (SERS) Spectroscopy

Facile and Scalable Synthesis and Self-Assembly of Chitosan Tartaric Sodium

Correlation of AFM/SEM/EDS Images to Discriminate Several Nanoparticle Populations Mixed in Cosmetics

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