Predicting coffee ring formation upon drying in droplets of particle suspensions

Hertaeg, Michael J.; Rees-Zimmerman, Clare; Tabor, Rico F.; Routh, Alexander F.

doi:10.1016/j.jcis.2021.01.092

Cited by 20 publications

(11 citation statements)

References 24 publications

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“…In all tests, a higher initial concentration of RBCs resulted in a greater volume of edge deposition. This is opposite to predictions and experiments with simple dispersions [ 35 , 36 ], where a high initial concentration was observed to suppress ring deposits in simple colloid suspensions. When RBCs are suspended in a protein solution the relationship with initial concentration is less defined because protein solutions with no cells produce ring structures.…”

Section: Resultscontrasting

confidence: 99%

“…To investigate this process further, an analytical model was developed using equation ( 4.1 ) which was used by previous researchers [ 35 , 36 , 46 , 47 ] to represent dimensionless droplet height ( h ) as a function of dimensionless time ( t ) and radial position ( r ). It is derived assuming lubrication theory and that pressure is solely a function of local curvature.…”

Section: Discussionmentioning

confidence: 99%

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Pattern formation in drying blood drops

Hertaeg

Tabor

Routh

2021

Phil. Trans. R. Soc. A.

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Patterns in dried droplets are commonly observed as rings left after spills of dirty water or coffee have evaporated. Patterns are also seen in dried blood droplets and the patterns have been shown to differ from patients afflicted with different medical conditions. This has been proposed as the basis for a new generation of low-cost blood diagnostics. Before these diagnostics can be widely used, the underlying mechanisms leading to pattern formation in these systems must be understood. We analyse the height profile and appearance of dispersions prepared with red blood cells (RBCs) from healthy donors. The red cell concentrations and diluent were varied and compared with simple polystyrene particle systems to identify the dominant mechanistic variables. Typically, a high concentration of non-volatile components suppresses ring formation. However, RBC suspensions display a greater volume of edge deposition when the red cell concentration is higher. This discrepancy is caused by the consolidation front halting during drying for most blood suspensions. This prevents the standard horizontal drying mechanism and leads to two clearly defined regions in final crack patterns and height profile. This article is part of a discussion meeting issue ‘A cracking approach to inventing new tough materials: fracture stranger than friction’.

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Section: Resultscontrasting

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Pattern formation in drying blood drops

Hertaeg

Tabor

Routh

2021

Phil. Trans. R. Soc. A.

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“…Several nanometer-sized (<10 nm) quantum dots dispersed in solution could move with the flow of the liquid in the paper fiber. The coffee ring effect of QDs was caused by the local non-uniformity of the liquid evaporating from the paper-based chip [ 32 , 33 ]. These issues caused some errors (the relative standard deviation (RSD) of the gray value was 2.3%) in data acquisition.…”

Section: Resultsmentioning

confidence: 99%

A Simple and Effective Visual Fluorescent Sensing Paper-Based Chip for the Ultrasensitive Detection of Mercury Ions in Environmental Water

Han

Liu

et al. 2023

Sensors

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Traces of mercury ions in environmental water can harm humans and animals. Paper-based visual detection methods have been widely developed for the rapid detection of mercury ions; however, existing methods are not sensitive enough to be used in real environments. Here, we developed a novel, simple and effective visual fluorescent sensing paper-based chip for the ultrasensitive detection of mercury ions in environmental water. CdTe-quantum-dots-modified silica nanospheres were firmly absorbed by and anchored to the fiber interspaces on the paper’s surface to effectively avoid the unevenness caused by liquid evaporation. The fluorescence of quantum dots emitted at 525 nm can be selectively and efficiently quenched with mercury ions, and the ultrasensitive visual fluorescence sensing results attained using this principle can be captured using a smartphone camera. This method has a detection limit of 2.83 µg/L and a fast response time (90 s). We successfully achieved the trace spiking detection of seawater (from three regions), lake water, river water and tap water with recoveries in the range of 96.8–105.4% using this method. This method is effective, low-cost, user-friendly and has good prospects for commercial application. Additionally, the work is expected to be utilized in the automated big data collection of large numbers of environmental samples.

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“…The height of edge corresponding to the droplet stain was estimated to be 45.2 ± 2.0 nm, with that of the center being 8.9 ± 1.2 nm. This morphology, induced by the coffee-ring effect, is typically observed when it shows a low contact angle [ 28 , 29 ]. Marangoni and capillary flows can be generated in droplets with a low contact angle, such as those of the NH 4 Br ligand ink (< 22; Additional file 1 : Figure S4) [ 30 – 33 ].…”

Section: Resultsmentioning

confidence: 99%

Ink-lithographic fabrication of silver-nanocrystal-based multiaxial strain gauge sensors through the coffee-ring effect for voice recognition applications

et al. 2022

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Human voice recognition techniques have remarkable potential for clinical applications because information from acoustic signals can reflect human body conditions. This paper reports the fabrication of Ag nanocrystal (NC)-based multiaxial wearable strain gauge sensors by ink-lithography for voice recognition systems. Benefiting from the one-step-device-fabrication strategy of ink-lithography, which can yield Ag NC patterns with specific dimensions and endow physical properties, the Ag NC-based multiaxial strain sensors can be fabricated on an ultrathin substrate (~ 6 μm). Additionally, the coffee-ring effect can be induced onto the Ag NC patterns to realize high sensitivity and angle dependence (gauge factors $${G}_{0^\circ }$$ G 0 ∘ = 11.7 ± 1.2 and $${G}_{90^\circ }$$ G 90 ∘ = 105.5 ± 20.1); moreover, the voice onset time for voice recognition can be detected by the sensors. These features assist in distinguishing between voiced and voiceless plosive contrasts via measurements of contact-based voice onset time differences and can act as a cornerstone for further advancements in wearable sensors as well as voice recognition and analysis. Graphical Abstract

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Predicting coffee ring formation upon drying in droplets of particle suspensions

Cited by 20 publications

References 24 publications

Pattern formation in drying blood drops

Pattern formation in drying blood drops

A Simple and Effective Visual Fluorescent Sensing Paper-Based Chip for the Ultrasensitive Detection of Mercury Ions in Environmental Water

Ink-lithographic fabrication of silver-nanocrystal-based multiaxial strain gauge sensors through the coffee-ring effect for voice recognition applications

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