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https://www.readbyqxmd.com/read/28510453/influence-of-local-heating-on-marangoni-flows-and-evaporation-kinetics-of-pure-water-drops
#1
Alexandros Askounis, Yutaku Kita, Masamichi Kohno, Yasuyuki Takata, Vasileios Koutsos, Khellil Sefiane
The effect of localized heating on the evaporation of pure sessile water drops was probed experimentally by a combination of infrared thermography and optical imaging. In particular, we studied the effect of three different heating powers and two different locations, directly below the center and edge of the drop. In all cases, four distinct stages were identified according to the emerging thermal patterns. In particular, depending on heating location, recirculating vortices emerge which either remain pinned or move azimuthally within the drop...
May 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28470269/shape-of-a-sessile-drop-on-a-flat-surface-covered-with-a-liquid-film
#2
Martin Tress, Stefan Karpitschka, Periklis Papadopoulos, Jacco H Snoeijer, Doris Vollmer, Hans-Jürgen Butt
Motivated by the development of lubricant-infused slippery surfaces, we study a sessile drop of a nonvolatile (ionic) liquid which is embedded in a slowly evaporating lubricant film (n-decane) on a horizontal, planar solid substrate. Using laser scanning confocal microscopy we imaged the evolution of the shape of the liquid/liquid and liquid/air interfaces, including the angles between them. Results are compared to solutions of the generalized Laplace equations describing the drop profile and the annular wetting ridge...
May 4, 2017: Soft Matter
https://www.readbyqxmd.com/read/28463480/an-open-pit-nanofluidic-tool-localized-chemistry-assisted-by-mesoporous-thin-film-infiltration
#3
Magalí Mercuri, Karina A Pierpauli, Claudio L A Berli, Martín G Bellino
Nanofluidics based on nanoscopic porous structures has emerged as the next evolutionary milestone in the construction of versatile nanodevices with unprecedented applications. However, the straightforward development of nanofluidically interconnected systems is crucial for the production of practical devices. Here, we demonstrate that spontaneous infiltration into supramolecularly templated mesoporous oxide films at the edge of a sessile drop in open air can be used to connect pairs of landmarks. The liquids from the drops can then join through the nanoporous network to guide a localized chemical reaction at the nanofluid-front interface...
May 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28447798/spontaneous-droplet-motion-on-a-periodically-compliant-substrate
#4
Tianshu Liu, Nichole Nadermann, Zhenping He, Steven H Strogatz, Chung-Yuen Hui, Anand Jagota
Droplet motion arises in many natural phenomena, ranging from the familiar gravity-driven slip and arrest of raindrops on windows to the directed transport of droplets for water harvesting by plants and animals under dry conditions. Deliberate transportation and manipulation of droplets are also important in many technological applications, including droplet-based microfluidic chemical reactors and for thermal management. Droplet motion usually requires gradients of surface energy or temperature or external vibration to overcome contact angle hysteresis...
May 8, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28446021/evaporation-of-drops-containing-silica-nanoparticles-of-varying-hydrophobicities-exploiting-particle-particle-interactions-for-additive-free-tunable-deposit-morphology
#5
Manos Anyfantakis, Damien Baigl, Bernard P Binks
We describe the systematic and quantitative investigation of a large number of patterns that emerge after the evaporation of aqueous drops containing fumed silica nanoparticles (NPs) of varying wettabilities for an extended particle concentration range. We show that for a chosen system, the dry pattern morphology is mainly determined by particle-particle interactions (Coulomb repulsion and hydrophobic attraction) in the bulk. These depend on both particle hydrophobicity and particle concentration within the drop...
May 8, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28421771/marangoni-contraction-of-evaporating-sessile-droplets-of-binary-mixtures
#6
Stefan Karpitschka, Ferenc Liebig, Hans Riegler
The Marangoni contraction of sessile drops of a binary mixture of a volatile and a nonvolatile liquid has been investigated experimentally and theoretically. The origin of the contraction is the locally inhomogeneous evaporation rate of sessile drops. This leads to surface tension gradients and thus to a Marangoni flow. Simulations show that the interplay of Marangoni flow, capillary flow, diffusive transport, and evaporative losses can establish a quasistationary drop profile with an apparent nonzero contact angle even if both liquid components individually wet the substrate completely...
May 2, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28384900/efficacy-of-green-tea-extract-for-treatment-of-dry-eye-and-meibomian-gland-dysfunction-a-double-blind-randomized-controlled-clinical-trial-study
#7
Mahmood Nejabat, Salehi Ali Reza, Mehdi Zadmehr, Masoud Yasemi, Zahra Sobhani
INTRODUCTION: With an incidence rate of 9%, dry eye is a common problem of the ocular surface, especially in patients more than 40-year-old. Green tea extract has anti-oxidative, anti-bacterial, anti-androgen, and immunomodulatory properties. AIM: To evaluate the efficacy of green tea extract for treatment of patients with dry eye and Meibomian Gland Dysfunction (MGD). MATERIALS AND METHODS: In a double-blind randomized controlled clinical trial, 60 patients were selected within the age range of 30 to 70 years, and divided into two groups by blocked randomization method...
February 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28343136/facile-microfluidic-production-of-composite-polymer-core-shell-microcapsules-and-crescent-shaped-microparticles
#8
Ekanem E Ekanem, Zilin Zhang, Goran T Vladisavljević
HYPOTHESIS: Core-shell microcapsules and crescent-shaped microparticles can be used as picolitre bioreactors for cell culture and microwells for cell trapping/immobilisation, respectively. RESULTS: Monodisperse polylactic acid (PLA) core-shell microcapsules with a diameter above 200μm, a shell thickness of 10μm, and 96% water entrapment efficiency were produced by solvent evaporation from microfluidically generated W/O/W emulsion drops with core-shell structure, and used to encapsulate Saccharomyces cerevisiae yeast cells in their aqueous cores...
March 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28338833/a-humidity-shock-leads-to-rapid-temperature-dependent-changes-in-coffee-leaf-physiology-and-gene-expression
#9
El-Hadji Thioune, James McCarthy, Thomas Gallagher, Bruce Osborne
Climate change is expected to increase the frequency of above-normal atmospheric water deficits contemporaneous with periods of high temperatures. Here we explore alterations in physiology and gene expression in leaves of Coffea canephora Pierre ex A. Froehner caused by a sharp drop in relative humidity (RH) at three different temperatures. Both stomatal conductance (gs) and CO2 assimilation (A) measurements showed that gs and A values fell quickly at all temperatures after the transfer to low RH.  However, leaf relative water content measurements indicated that leaves nonetheless experienced substantial water losses, implying that stomatal closure and/or resupply of water was not fast enough to stop excessive evaporative losses...
March 1, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28295107/self-wrapping-of-an-ouzo-drop-induced-by-evaporation-on-a-superamphiphobic-surface
#10
Huanshu Tan, Christian Diddens, Michel Versluis, Hans-Jürgen Butt, Detlef Lohse, Xuehua Zhang
Evaporation of multi-component drops is crucial to various technologies and has numerous potential applications because of its ubiquity in nature. Superamphiphobic surfaces, which are both superhydrophobic and superoleophobic, can give a low wettability not only for water drops but also for oil drops. In this paper, we experimentally, numerically and theoretically investigate the evaporation process of millimetric sessile ouzo drops (a transparent mixture of water, ethanol, and trans-anethole) with low wettability on a superamphiphobic surface...
April 12, 2017: Soft Matter
https://www.readbyqxmd.com/read/28294265/accelerated-evaporation-of-water-on-graphene-oxide
#11
Rongzheng Wan, Guosheng Shi
Using molecular dynamics simulations, we show that the evaporation of nanoscale volumes of water on patterned graphene oxide is faster than that on homogeneous graphene oxide. The evaporation rate of water is insensitive to variation in the oxidation degree of the oxidized regions, so long as the water film is only distributed on the oxidized regions. The evaporation rate drops when the water film spreads onto the unoxidized regions. Further analysis showed that varying the oxidation degree observably changed the interaction between the outmost water molecules and the solid surface, but the total interaction for the outmost water molecules only changed a very limited amount due to the correspondingly regulated water-water interaction when the water film is only distributed on the oxidized regions...
March 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28294114/dynamics-and-universal-scaling-law-in-geometrically-controlled-sessile-drop-evaporation
#12
P J Sáenz, A W Wray, Z Che, O K Matar, P Valluri, J Kim, K Sefiane
The evaporation of a liquid drop on a solid substrate is a remarkably common phenomenon. Yet, the complexity of the underlying mechanisms has constrained previous studies to spherically symmetric configurations. Here we investigate well-defined, non-spherical evaporating drops of pure liquids and binary mixtures. We deduce a universal scaling law for the evaporation rate valid for any shape and demonstrate that more curved regions lead to preferential localized depositions in particle-laden drops. Furthermore, geometry induces well-defined flow structures within the drop that change according to the driving mechanism...
March 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28292574/effect-of-lipid-based-dry-eye-supplements-on-the-tear-film-in-wearers-of-eye-cosmetics
#13
Michael T M Wang, Irene Sung Hee Cho, Soo Hee Jung, Jennifer P Craig
PURPOSE: To compare the effects on tear film parameters and contamination in cosmetic eyeliner wearers, after single application of two lipid-based dry eye treatments: a lipid-containing lubricant eye drop and a phospholipid liposomal spray. METHODS: Fifty participants were enrolled in a prospective, randomised, paired-eye, investigator-masked trial. Pencil eyeliner (Body Shop(®) Crayon Eye Definer) was applied to the upper eyelid periocular skin of both eyes, anterior to the lash line...
March 11, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28276550/particle-size-specific-distribution-of-perfluoro-alkyl-substances-in-atmospheric-particulate-matter-in-asian-cities
#14
H Ge, E Yamazaki, N Yamashita, S Taniyasu, A Ogata, M Furuuchi
Seasonal and local characteristics of perfluorinated alkylated substances (PFASs) were examined using size-segregated particles including an ultrafine range. The examination included sampling and analysis of ambient particles collected at four sites located in different environments in three different countries, Japan (Kanazawa and Okinawa), Hong Kong and India. To minimize the evaporation artefacts derived from PFASs during the sampling, an air sampler that permitted particles smaller than 0.1 μm (PM0.1) to be separated at a moderate pressure drop (<5-15 kPa), was used for all of the air sampling procedures...
April 19, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28256858/marangoni-bursting-evaporation-induced-emulsification-of-binary-mixtures-on-a-liquid-layer
#15
L Keiser, H Bense, P Colinet, J Bico, E Reyssat
Adjusting the wetting properties of water through the addition of a miscible liquid is commonly used in a wide variety of industrial processes involving interfaces. We investigate experimentally the evolution of a drop of water and volatile alcohol deposited on a bath of oil: The drop spreads and spontaneously fragments into a myriad of minute droplets whose size strongly depends on the initial concentration of alcohol. Marangoni flows induced by the evaporation of alcohol play a key role in the overall phenomenon...
February 17, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28215806/introducing-the-2-drops-model-for-two-dimensional-simulation-of-crop-roots-and-pesticide-within-the-soil-root-zone
#16
Annika Agatz, Colin D Brown
Mathematical models of pesticide fate and behaviour in soils have been developed over the last 30years. Most models simulate fate of pesticides in a 1-dimensional system successfully, supporting a range of applications where the prediction target is either bulk residues in soil or receiving compartments outside of the soil zone. Nevertheless, it has been argued that the 1-dimensional approach is limiting the application of knowledge on pesticide fate under specific pesticide placement strategies, such as seed, furrow and band applications to control pests and weeds...
May 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28205642/evaporation-of-inclined-water-droplets
#17
Jin Young Kim, In Gyu Hwang, Byung Mook Weon
When a drop is placed on a flat substrate tilted at an inclined angle, it can be deformed by gravity and its initial contact angle divides into front and rear contact angles by inclination. Here we study on evaporation dynamics of a pure water droplet on a flat solid substrate by controlling substrate inclination and measuring mass and volume changes of an evaporating droplet with time. We find that complete evaporation time of an inclined droplet becomes longer as gravitational influence by inclination becomes stronger...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28188877/laser-deposition-of-poly-3-hydroxybutyric-acid-co-3-hydroxyvaleric-acid-lysozyme-microspheres-based-coatings-with-anti-microbial-properties
#18
V Grumezescu, A M Holban, L E Sima, M B Chiritoiu, G N Chiritoiu, A M Grumezescu, L Ivan, F Safciuc, F Antohe, C Florica, C R Luculescu, M C Chifiriuc, G Socol
The purpose of this study was to obtain, characterize and evaluate the cytotoxicity and antimicrobial activity of coatings based on poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid) - Lysozyme (P(3HB-3HV)/Lys) and P(3HB-3HV) - Polyethylene glycol - Lysozyme (P(3HB-3HV)/PEG/Lys) spheres prepared by Matrix Assisted Pulsed Laser Evaporation (MAPLE) technique, in order to obtain functional and improved Ti-based implants. Morphological investigation of the coatings by Infrared Microscopy (IRM) and SEM revealed that the average diameter of P(3HB-3HV)/Lys spheres is around 2μm and unlike the drop cast samples, IRM recorded on MAPLE films revealed a good distribution of monitored functional groups on the entire scanned surface...
February 7, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28185907/pharmaceutical-co-crystal-of-flufenamic-acid-synthesis-and-characterization-of-two-novel-drug-drug-co-crystal
#19
Sunil Kumar Nechipadappu, Venkatadri Tekuri, Darshak R Trivedi
Two novel pharmaceutical co-crystals of anti-inflammatory drug flufenamic acid (FFA) with 2-chloro-4-nitrobenzoic acid (CNB) and ethenzamide (ETZ) have been synthesized by solvent evaporation method as well as by solvent drop-assisted grinding method. The synthesized co-crystals were characterized thoroughly by various spectroscopic methods and crystal structures were determined by single-crystal x-ray diffraction technique. In FFA-CNB co-crystal, robust supramolecular acid-acid homosynthon was observed. FFA-ETZ co-crystal is formed via robust supramolecular acid-amide heterosynthon...
February 7, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28185211/clear-aqueous-topical-drop-of-triamcinolone-acetonide
#20
Hoang M Trinh, Kishore Cholkar, Mary Joseph, Xiaoyan Yang, Ashim K Mitra
The objective of this study was to develop a clear aqueous mixed nanomicellar formulation (NMF) of triamcinolone acetonide (TA) with a combination of nonionic surfactant hydrogenated castor oil 60 (HCO-60) and octoxynol-40 (Oc-40). In order to delineate the effects of drug-polymer interactions on entrapment efficiency (EE), loading efficiency (LE), and critical micellar concentration (CMC), a design of experiment (DOE) was performed to optimize the formulation. In this study, full-factorial design has been used with HCO-60 and OC-40 as independent variables...
February 9, 2017: AAPS PharmSciTech
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