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drop evaporation

Weipeng Luo, Bin Yu, Dingbang Xiao, Meng Zhang, Xuezhong Wu, Guoxi Li
In this paper, we present a periodic hollowed-out pyramid microstructure with excellent superhydrophobicity. In our approach, T-topping pillars and capillary-induced self-assembly methods were combined with the photolithography process to fabricate a hollowed-out pyramid structure. First, a wideband ultraviolet source without a filter was used to fabricate the T-topping pillars during the exposure process; then, the evaporation-induced assembly collapsed the pillars and formed the hollowed-out pyramid structure...
May 16, 2018: Materials
Tuan Anh Huu Nguyen, Simon R Biggs, Anh V Nguyen
Current analytical models for sessile droplet evaporation do not consider the non-uniform temperature field within the droplet and can over-predict the evaporation by 20%. This deviation can be attributed to a significant temperature drop due to the release of the latent heat of evaporation along the air-liquid interface. We report, for the first time, an analytical solution of the sessile droplet evaporation coupled with this interfacial cooling effect. The two-way coupling model of the quasi-steady thermal diffusion within the droplet and the quasi-steady diffusion-controlled droplet evaporation is conveniently solved in the toroidal coordinate system by applying the method of separation of variables...
May 14, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Anna Zigelman, Ofer Manor
HYPOTHESIS: The deposition of particles from a volatile liquid drop atop a substrate is primarily governed by the advection and diffusion of the particles in the liquid. Colloidal particles may further coagulate and adsorb to the substrate during the deposition process. The external geometry and the internal composition of the particulate deposit are then determined by an interplay between these four mechanisms. SIMULATION: We simulate the process of deposition by solving the governing transport equations...
April 13, 2018: Journal of Colloid and Interface Science
Lihui Wang, Michael T Harris
Capillary flow and Marangoni flow influence flow patterns of an evaporating liquid drop. While it is obvious that Marangoni stress on the drop surface affects the surface flow direction, we found that capillary flow also has an impact. The numerical results of this study showed a stagnation point near the contact line, which was further ex- plained by the lubrication theory. The stagnation point is produced by the competing effects of Marangoni flow and capillary flow, and emerges when the contact angle is small, because the divergence of the capillary flow near the contact line increases as the contact angle decreases...
May 2, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Fabio Villa, Marco Marengo, Joël De Coninck
The measurement of the equilibrium contact angle (ECA) of a weakly evaporating sessile drop becomes very challenging when the temperatures are higher than ambient temperature. Since the ECA is a critical input parameter for numerical simulations of diabatic processes, it is relevant to know the variation of the ECA with the fluid and wall temperatures. Several research groups have studied the effect of temperature on ECA either experimentally, with direct measures, or numerically, using molecular dynamic simulations...
April 25, 2018: Scientific Reports
Xiaoming Zhao, Tianjun Liu, Yuzhou Cui, Xueyan Hou, Zilu Liu, Xingyi Dai, Jie Kong, Wenda Shi, T John S Dennis
There are only a few reported methods by which the size and morphology of organic single crystals for high-performance organic field-effect transistors (OFETs) or other devices can be controlled. Here, a facile solution-processed antisolvent vapor diffusion method was employed to grow millimeter-length C60 single crystal microwires directly in solution. The size of the microwires can be controllably varied via the C60 concentration and/or the choice of antisolvent. OFETs fabricated from the as-produced microwires exhibit mobilities as high as 2...
April 20, 2018: Nanoscale
Ali Mazloomi Moqaddam, Dominique Derome, Jan Carmeliet
The contact line dynamics of evaporating droplets deposited on a set of parallel micro-ribs is analyzed with the use of a recently developed entropic lattice Boltzmann model for two-phase flow. Upon deposition, part of the droplet penetrates into the space between ribs due to capillary action, while the remaining liquid of the droplet remains pinned on top of the micro-ribs. In a first stage, evaporation continues until the droplet undergoes a series of pinning-depinning events, showing alternatively constant contact radius and constant contact angle modes...
April 18, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Maryam Parsa, Souad Harmand, Khellil Sefiane
The formation of patterns after the evaporation of colloidal droplets deposited on a solid surface is an everyday natural phenomenon. During the past two decades, this topic has gained broader audience due to its numerous applications in biomedicine, nanotechnology, printing, coating, etc. This paper presents a detailed review of the experimental studies related to the formation of various deposition patterns from dried droplets of complex fluids (i.e., nanofluids, polymers). First, this review presents the fundamentals of sessile droplet evaporation including evaporation modes and internal flow fields...
April 2018: Advances in Colloid and Interface Science
Xianjiang Li, Hongmei Li, Wen Ma, Zhen Guo, Xiaomin Li, Xiuqin Li, Qinghe Zhang
Quick and simple analytical methodology has been developed for the measurement of patulin in apple juice by combining single-drop liquid-liquid-liquid microextraction with isotope dilution ultra-high performance liquid chromatography-mass spectrometry. After systematic parameters optimization, the whole sample pretreatment only consisted of single extraction that consumed 1.5 mL ethyl acetate. While, other methods usually needed complicated pretreatment, including extraction, purification, evaporation and redissolution...
August 15, 2018: Food Chemistry
Samantha A McBride, Susmita Dash, Kripa K Varanasi
Mineral-fouling induced corrosion and deterioration of marine vessels, aircraft, and coastal structures is due in part from structural intrusion of crystals grown from ocean-generated saline drops. As such, much work has explored surface treatments that induce hydrophobicity or introduce barriers for anti-fouling and corrosion-prevention; however, the efficacy of these strategies will be altered by the underlying substrate texture. Here, we study the behavior of evaporating saline drops on superhydrophobic and liquid impregnated surfaces as a function of surface texture...
April 3, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Guang Chu, Rita Vilensky, Gleb Vasilyev, Patrick Martin, Ruiyan Zhang, Eyal Zussman
The study of colloidal liquid crystals (LCs) reveals fundamental insights into the nature of ordered materials, giving rise to emergent properties with fascinating applications in soft matter nanotechnology. Here we investigate the shape instabilities, layer undulations, dynamic assembly, and collective behaviors in evaporating a cellulose nanocrystal-based cholesteric LC drop. During the drying process, the drop edges are pinned to the substrate with spontaneous convective flow occurring along the drop, which leads to nonequilibrium sliding of the individual cholesteric fragment with active ordering as well as hydrodynamic fluctuations and flow transitions in the bulk cholesteric phase...
March 29, 2018: Journal of Physical Chemistry Letters
Guru A Venkatesan, Graham J Taylor, Colin M Basham, Nathan G Brady, C Patrick Collier, Stephen A Sarles
In this article, we report on a new experimental methodology to enable reliable formation of droplet interface bilayer (DIB) model membranes with two types of unsaturated lipids that have proven difficult for creating stable DIBs. Through the implementation of a simple evaporation technique to condition the spontaneously assembled lipid monolayer around each droplet, we increased the success rates of DIB formation for two distinct unsaturated lipids, namely 1,2-dioleoyl- sn -glycero-3-phosphocholine (DOPC) and 1-palmitoyl-2-oleoyl- sn -glycero-3-phosphocholine (POPC), from less than 10% to near 100%...
March 2018: Biomicrofluidics
Navakouski Maksim, Shilova Nadezhda, Khasbiullina Nailya, Feofanov Alexey, Pudova Elena, Chen Kowa, Blixt Ola, Bovin Nicolai
Despite considerable success studying glycan-binding proteins using printed glycan arrays (PGAs), unambiguous quantitation of spot intensities by fluorescent readers remains a challenge. The main obstacles are the varying spot shape and size and in-spot fluorescence distribution caused by uneven drying of the printed drops. Two methods have been suggested for solving this problem: using polymeric glycoconjugates, which makes it possible to equalize the physicochemical properties (hydrophobicity, charge, and size) of different glycans, and applying a glycan solution on a slide coated with a thin oil mask, which hinders evaporation of the drop...
March 1, 2018: BioTechniques
Thiyagarajan Subramanian, Edwin Geo Varuvel, Saravanan Ganapathy, S Vedharaj, R Vallinayagam
The present study intends to explore the effect of the addition of fuel additives with camphor oil (CMO) on the characteristics of a twin-cylinder compression ignition (CI) engine. The lower viscosity and boiling point of CMO when compared to diesel could improve the fuel atomization, evaporation, and air/fuel mixing process. However, the lower cetane index of CMO limits its use as a drop in fuel for diesel in CI engine. In general, NOX emission increases for less viscous and low cetane (LVLC) fuels due to pronounced premixed combustion phase...
March 21, 2018: Environmental Science and Pollution Research International
F Giorgiutti-Dauphiné, L Pauchard
The drying of complex fluids involves a large number of microscopic phenomena (transport and organization of non-volatile solutes) as well as hydrodynamic and mechanical instabilities. These phenomena can be captured in drying sessile drops where different domains can be identified: strong concentration gradients, formation of a glassy or porous envelope that withstands mechanical stress, and consolidation of a layer strongly adhering to the substrate at the drop edge. In colloidal systems, we quantify the evolution of the particle volume fraction at a nanometric scale and microscopic scale and identify the conditions for the envelope formation at the free surface by balancing the effect of diffusion and evaporation...
March 19, 2018: European Physical Journal. E, Soft Matter
Victor J Drew, Ching-Li Tseng, Jerard Seghatchian, Thierry Burnouf
Dry eye syndrome (DES) is a multifactorial, frequent, pathology characterized by deficient tear production or increased evaporation of tears and associated with ocular surface alteration and inflammation. It mostly affects, but not exclusively, older individuals and leads to varying degrees of discomfort and decreased quality of life. Although the typical treatments of DES rely on using artificial tears, polyunsaturated fatty acids, integrin antagonists, anti-inflammatory agents, or on performing punctal occlusion, recently, standardized blood-derived serum eye drops (SED) are generating much interest as a new physiological treatment option...
2018: Frontiers in Medicine
Masato Nakamura, René-Jean Tarento
The fragmentation of doubly and triply charged mercury clusters is theoretically studied to analyze an experiment performed by Katakuse's group at Osaka University [T. Satoh et al., J. Mass Spectrom. Soc. Jpn. 51, 391 (2003)]. The fission barrier is calculated using a liquid-drop model proposed by Echt et al. In the decay of doubly charged clusters, the barrier height is found to take the minimum value for nearly symmetric fission. On the other hand, in the decay of triply charged clusters, the barrier is the lowest for strongly asymmetric fission...
February 28, 2018: Journal of Chemical Physics
Nozomi Saito, Higashi Kobayashi, Kiyoshi Kanie, Masahiko Yamaguchi
Long-range anisotropic structural materials exhibit notable optical and mechanical properties, and described here is an efficient method of synthesizing such materials involving self-assembly of well-defined monodispersed organic molecules. Hetero-double-helices are formed in toluene using a pseudoenantiomeric mixture of an ethynylhelicene (M)-tetramer with C16 terminal groups and a (P)-pentamer. When the concentration of the mixture was increased, the hetero-double-helices self-assembled to form lyotropic liquid crystal gels...
February 28, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
F Wodlei, J Sebilleau, J Magnaudet, V Pimienta
Drop motility at liquid surfaces is attracting growing interest because of its potential applications in microfluidics and artificial cell design. Here we report the unique highly ordered pattern that sets in when a millimeter-size drop of dichloromethane spreads on an aqueous substrate under the influence of surface tension, both phases containing a surfactant. Evaporation induces a Marangoni flow that forces the development of a marked rim at the periphery of the spreading film. At some point this rim breaks up, giving rise to a ring of droplets, which modifies the aqueous phase properties in such a way that the film recoils...
February 26, 2018: Nature Communications
C S Dias, P J Yunker, A G Yodh, N A M Araújo, M M Telo da Gama
The deposition process at the edge of evaporating colloidal drops varies with the shape of suspended particles. Experiments with prolate ellipsoidal particles suggest that the spatiotemporal properties of the deposit depend strongly on particle aspect ratio. As the aspect ratio increases, the particles form less densely-packed deposits and the statistical behavior of the deposit interface crosses over from the Kardar-Parisi-Zhang (KPZ) universality class to another universality class which was suggested to be consistent with the KPZ plus quenched disorder...
March 7, 2018: Soft Matter
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