Oscillation dynamics of colloidal particles caused by surfactant in an evaporating droplet

Seo, Hae Won; Jung, Narina; Yoo, Chun Sang

doi:10.1007/s12206-020-0128-1

Cited by 6 publications

(5 citation statements)

References 41 publications

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“…[ 49 − 51 ] The broader and thicker ring at the outer edge could be attributed to convection flow towards the droplet contact line in order to replace the evaporated liquid at the border and consequently deposition of more solute dyes in that region. Such migration is accelerated with the influence of well‐known Marangoni flow inside the droplet, [ 52 ] specifically with the presence of poly(vinyl alcohol) (PVA) in this study acting as a surfactant. [ 53 ]…”

Section: Resultsmentioning

confidence: 99%

CLeANFIT – Contact‐Less Axial Nearfield‐Based Fluorescence Imaging Topography: A Method for 3D Micro‐ and Nanotopography Characterization

Ghaeli

Adão

Nieder

2020

Adv Materials Inter

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Surface nanostructures include thin/ ultrathin films, whose precise characterization is important in semiconductors, optical components, and wear-resistance coatings. Also, surface-assembled and densely packed nanoparticle clusters such as viruses, [4,5] colloidal molecules, [6] DNA, [7] and supramolecules [8] form extended complex surface nanostructures which could be used to explore new paradigms in nanobiotechnology. Analyzing the surface bio-nanotopography could open new possibilities of bio-inspired system engineering. [9] In biology, the nanotopographical measurement scaled down to a single-molecule level eventually leads to the nanodisplaying of compartments in densely packed biological environments. Thus, depicting the morphology of macromolecular structures with high spatial and genomic resolution is expected to reveal the complex biological structures and underlying molecular mechanisms. [10] Various microscale characterization techniques enable the study of physicochemical properties of microstructures, such as scanning electron microscopy (SEM), energy dispersive X-Ray analysis (EDAX), and Raman spectroscopy. Surface micro-and submicro topographies can be measured by a wide range of optical instruments such as phase shifting interferometry and coherence scanning interferometry (CSI), point autofocus instrument (PAI), focus variation microscopy (FVM), and imaging confocal microscopy (ICM). [11,12] However, such techniques and particularly the commercial interferometric ones are incapable of precise measurement when it comes to irregular topographies of materials with complex optical properties and nanometer resolution. [13] The advent of nanoscopic scale techniques such as scanning tunneling microscopy (STM), atomic force microscopy (AFM), and scanning probe microscopies (SPM) initiates an important step to surface micro-/nanomorphological characterization. [14,15] Nonetheless, AFM and the contact profilometer are the only promising techniques for exact surface topography quantification. These are inclusively used to assess the behavior of optical measurement techniques, but they are very time-consuming and surface-intrusive. [11] Quantifying the micro-/nanotopography of thin films, surface nanostructures and nano-bio behavior at liquid/solid interfaces A nearfield-based topographic imaging method is presented to obtain 3D micro-/nanotopography in labelled structures over lateral ranges of hundreds of micrometers with an axial thickness from 1000 nm to thin layers of below 100 nm. The contactless axial nearfield-based fluorescence imaging topography (CLeANFIT) nanometrology technique is based on a modified model used in nearfield-based super-resolution imaging and sensing. The modified approach allows converting fluorescence lifetimes into nanoscale thicknesses of a fluorescent material in the nearfield of a metal surface. CLeANFIT is used to characterize the drying process of a fluorophore-doped poly(vinyl alcohol)/water droplet and it allows to quantify the nanomorphological patterns formed during an...

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Section: Resultsmentioning

confidence: 99%

CLeANFIT – Contact‐Less Axial Nearfield‐Based Fluorescence Imaging Topography: A Method for 3D Micro‐ and Nanotopography Characterization

Ghaeli

Adão

Nieder

2020

Adv Materials Inter

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“…Autonomous colloidal oscillation has been applied to mimic such oscillatory movements, which is driven by chemical oscillation [ 8 , 9 ] or DNA hybridization [ 10 ]. However, such autonomous oscillation is usually slow and difficult to control [ 11 , 12 ]. Thus, advanced colloidal manipulation requires on-demand controllability and directionality, which is substantial for digital and optical applications [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Light-Programmed Bistate Colloidal Actuation Based on Photothermal Active Plasmonic Substrate

et al. 2023

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Active particles have been regarded as the key models to mimic and understand the complex systems of nature. Although chemical and field-powered active particles have received wide attentions, light-programmed actuation with long-range interaction and high throughput remains elusive. Here, we utilize photothermal active plasmonic substrate made of porous anodic aluminum oxide filled with Au nanoparticles and poly( N -isopropylacrylamide) (PNIPAM) to optically oscillate silica beads with robust reversibility. The thermal gradient generated by the laser beam incurs the phase change of PNIPAM, producing gradient of surface forces and large volume changes within the complex system. The dynamic evolution of phase change and water diffusion in PNIPAM films result in bistate locomotion of silica beads, which can be programmed by modulating the laser beam. This light-programmed bistate colloidal actuation provides promising opportunity to control and mimic the natural complex systems.

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“…The occurrence of patterns in deposits is a frequent phenomenon that emerges in drying droplets with nonvolatile species [ 19 , 20 , 21 , 22 ]. The literature reveals that the coffee ring can appear in both simple and complex droplet systems [ 23 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Patterns in Dried Droplets to Detect Unfolded BSA

Carreón

Gómez-López

Díaz-Hernández

et al. 2022

Sensors

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The morphological analysis of patterns in dried droplets has allowed the generation of efficient techniques for the detection of molecules of medical interest. However, the effectiveness of this method to reveal the coexistence of macromolecules of the same species, but different conformational states, is still unknown. To address this problem, we present an experimental study on pattern formation in dried droplets of bovine serum albumin (BSA), in folded and unfolded conformational states, in saline solution (NaCl). Folded proteins produce a well-defined coffee ring and crystal patterns all over the dry droplet. Depending on the NaCl concentration, the crystals can be small, large, elongated, entangled, or dense. Optical microscopy reveals that the relative concentration of unfolded proteins determines the morphological characteristics of deposits. At a low relative concentration of unfolded proteins (above 2%), small amorphous aggregates emerge in the deposits, while at high concentrations (above 16%), the “eye-like pattern”, a large aggregate surrounded by a uniform coating, is produced. The radial intensity profile, the mean pixel intensity, and the entropy make it possible to characterize the patterns in dried droplets. We prove that it is possible to achieve 100% accuracy in identifying 4% of unfolded BSA contained in a protein solution.

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Oscillation dynamics of colloidal particles caused by surfactant in an evaporating droplet

Cited by 6 publications

References 41 publications

CLeANFIT – Contact‐Less Axial Nearfield‐Based Fluorescence Imaging Topography: A Method for 3D Micro‐ and Nanotopography Characterization

CLeANFIT – Contact‐Less Axial Nearfield‐Based Fluorescence Imaging Topography: A Method for 3D Micro‐ and Nanotopography Characterization

Light-Programmed Bistate Colloidal Actuation Based on Photothermal Active Plasmonic Substrate

Patterns in Dried Droplets to Detect Unfolded BSA

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