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https://www.readbyqxmd.com/read/29350628/inkjet-printing-and-electrical-characterisation-of-dna-templated-cadmium-sulfide-nanowires
#1
Raushan Nurdillayeva, Atsinafe Oshido, Thomas Bamford, Osama El-Zubir, Andrew Houlton, John Hedley, Andrew Pike, Benjamin Horrocks
Cadmium sulfide can be templated on -DNA molecules to form an aqueous dispersion of CdS/-DNA nanowires. Subsequent addition of ethylene glycol to 50% v/v is sufficient to formulate an ink suitable for printing using piezoelectric drop-on-demand technology. Printed droplet arrays show a coffee-ring morphology of individual deposits by fluorescence and Raman microscopy, but upon increasing the number of layers of printed material by repeated printing over each droplet, the dry deposit approaches closer to a disc shape...
January 19, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29348509/triggering-molecular-assembly-at-the-mesoscale-for-advanced-raman-detection-of-proteins-in-liquid
#2
Martina Banchelli, Marella de Angelis, Cristiano D'Andrea, Roberto Pini, Paolo Matteini
An advanced optofluidic system for protein detection based on Raman signal amplification via dewetting and molecular gathering within temporary mesoscale assemblies is presented. The evaporation of a microliter volume of protein solution deposited in a circular microwell precisely follows an outward-receding geometry. Herein the combination of liquid withdrawal with intermolecular interactions induces the formation of self-assembled molecular domains at the solid-liquid interface. Through proper control of the evaporation rate, amplitude of the assemblies and time for spectral collection at the liquid edge are extensively raised, resulting in a local enhancement and refinement of the Raman response, respectively...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29347292/boundary-conditions-for-a-one-sided-numerical-model-of-evaporative-instabilities-in-sessile-drops-of-ethanol-on-heated-substrates
#3
Sergey Semenov, Florian Carle, Marc Medale, David Brutin
The work is focused on obtaining boundary conditions for a one-sided numerical model of thermoconvective instabilities in evaporating pinned sessile droplets of ethanol on heated substrates. In the one-sided model, appropriate boundary conditions for heat and mass transfer equations are required at the droplet surface. Such boundary conditions are obtained in the present work based on a derived semiempirical theoretical formula for the total droplet's evaporation rate, and on a two-parametric nonisothermal approximation of the local evaporation flux...
December 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346906/smoothed-particle-hydrodynamics-method-for-evaporating-multiphase-flows
#4
Xiufeng Yang, Song-Charng Kong
The smoothed particle hydrodynamics (SPH) method has been increasingly used for simulating fluid flows; however, its ability to simulate evaporating flow requires significant improvements. This paper proposes an SPH method for evaporating multiphase flows. The present SPH method can simulate the heat and mass transfers across the liquid-gas interfaces. The conservation equations of mass, momentum, and energy were reformulated based on SPH, then were used to govern the fluid flow and heat transfer in both the liquid and gas phases...
September 2017: Physical Review. E
https://www.readbyqxmd.com/read/29289178/lithography-free-resistance-thermometry-based-technique-to-accurately-measure-seebeck-coefficient-and-electrical-conductivity-for-organic-and-inorganic-thin-films
#5
Pawan Kumar, D V Maheswar Repaka, Kedar Hippalgaonkar
We have developed a new and accurate technique to measure temperature dependent in-plane Seebeck coefficient and electrical conductivity of organic and inorganic thin films. The measurement device consists of one heater, two thermometers, and a four-probe configuration which is patterned on a substrate of choice using a simple shadow mask. The high resolution in temperature measurements and repeatability of resistance thermometry is leveraged while enabling simple implementation using only a shadow mask for patterning...
December 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29281753/the-interaction-of-drought-and-habitat-explain-space-time-patterns-of-establishment-in-saguaro-carnegiea-gigantea
#6
Daniel E Winkler, Joshua L Conver, Travis E Huxman, Don E Swann
The long-lived columnar saguaro cactus (Carnegiea gigantea) is among the most studied plants in the world. Long-term studies have shown saguaro establishment to be generally episodic and strongly influenced by precipitation and temperature. Water limitation through lower-than-average seasonal rainfall and elevated temperatures increasing evaporative loss can reduce survivorship of recent germinates. Thus, multi-year, extended drought could cause populations to decline as older saguaros die without replacement...
December 27, 2017: Ecology
https://www.readbyqxmd.com/read/29178351/printing-semiconductor-insulator-polymer-bilayers-for-high-performance-coplanar-field-effect-transistors
#7
Laju Bu, Mengxing Hu, Wanlong Lu, Ziyu Wang, Guanghao Lu
Source-semiconductor-drain coplanar transistors with an organic semiconductor layer located within the same plane of source/drain electrodes are attractive for next-generation electronics, because they could be used to reduce material consumption, minimize parasitic leakage current, avoid cross-talk among different devices, and simplify the fabrication process of circuits. Here, a one-step, drop-casting-like printing method to realize a coplanar transistor using a model semiconductor/insulator [poly(3-hexylthiophene) (P3HT)/polystyrene (PS)] blend is developed...
November 27, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29171611/loosely-packed-monolayer-coffee-stains-in-dried-drops-of-soft-colloids
#8
M Mayarani, Madivala G Basavaraj, Dillip K Satapathy
We report a complete suppression of the coffee-ring effect resulting in the formation of loosely packed two-dimensional particle monolayers by controlled evaporation of sessile drops containing soft microgel particles. These particulate deposits show gradual order-to-disorder transitions that are not abrupt like deposits of hard colloids. The areal coverage of the monolayer deposits can also be precisely controlled by tuning the particle concentration. The preferential adsorption of soft-microgel particles to the water-vapor interface, and their radial flow along the interface towards the drop edge facilitates the creation of the novel monolayer deposits...
November 24, 2017: Nanoscale
https://www.readbyqxmd.com/read/29155704/experimental-system-of-solar-adsorption-refrigeration-with-concentrated-collector
#9
Z X Yuan, Y X Li, C X Du
To improve the performance of solar adsorption refrigeration, an experimental system with a solar concentration collector was set up and investigated. The main components of the system were the adsorbent bed, the condenser, the evaporator, the cooling sub-system, and the solar collector. In the first step of the experiment, the vapor-saturated bed was heated by the solar radiation under closed conditions, which caused the bed temperature and pressure to increase. When the bed pressure became high enough, the bed was switched to connect to the condenser, thus water vapor flowed continually from the bed to the condenser to be liquefied...
October 18, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29144986/decadal-changes-in-emissions-of-volatile-organic-compounds-vocs-from-on-road-vehicles-with-intensified-automobile-pollution-control-case-study-in-a-busy-urban-tunnel-in-south-china
#10
Yanli Zhang, Weiqiang Yang, Isobel Simpson, Xinyu Huang, Jianzhen Yu, Zhonghui Huang, Zhaoyi Wang, Zhou Zhang, Di Liu, Zuzhao Huang, Yujun Wang, Chenglei Pei, Min Shao, Donald R Blake, Junyu Zheng, Zhijiong Huang, Xinming Wang
In the efforts at controlling automobile emissions, it is important to know in what extent air pollutants from on-road vehicles could be truly reduced. In 2014 we conducted tests in a heavily trafficked tunnel in south China to characterize emissions of volatile organic compounds (VOC) from on-road vehicle fleet and compared our results with those obtained in the same tunnel in 2004. Alkanes, aromatics, and alkenes had average emission factors (EFs) of 338, 63, and 42 mg km(-1) in 2014 against that of 194, 129, and 160 mg km(-1) in 2004, respectively...
November 13, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29135258/effect-of-substrate-temperature-on-pattern-formation-of-bidispersed-particles-from-volatile-drops
#11
Maryam Parsa, Souad Harmand, Khellil Sefiane, Maxence Bigerelle, Raphaël Deltombe
In this study, pattern formation during evaporation of bidispersed drops (containing 1 and 3.2 μm particles) placed on a smooth substrate at different temperatures is investigated. Five distinctive deposition patterns are observed depending on the substrate temperature: a relatively uniform pattern enclosed by a disk-shaped ring, a nearly nonuniform pattern inside a thick outer ring, a "dual-ring" pattern, a "rose-like" pattern, and a set of concentric rings corresponding to the "stick-slip" pattern. At drops edge, the particle size effect leads to the formation of three rings: an outermost ring formed by the nonvolatile additives smaller than 1 μm, a middle ring built by particles with size of 1 μm, and an innermost ring formed by the mixture of 1 and 3...
November 29, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29134743/rapid-determination-of-ginkgolic-acids-in-ginkgo-biloba-kernels-and-leaves-by-direct-analysis-in-real-time-mass-spectrometry
#12
Zhongping Huang, Yueting Xu, Yilei Huang, Charles Liu, Kezhi Jiang, Lili Wang
A novel method on basis of direct analysis in real time integrated with mass spectrometry was established and applied into rapid determination of ginkgolic acids in Ginkgo biloba kernels and leaves. Instrument parameter settings were optimized to obtain the sensitive and accurate determination of ginkgolic acids. At the sample introduction speed of 0.2 mm/s, high intensity of [M-H](-) ions for ginkgolic acids were observed in the negative ion mode by utilization of high purity helium gas at 450°C. 2 μL methanol extract of Ginkgo biloba kernels or leaves dropped on the surface of Quick-Strip module was analyzed after solvent evaporated to dryness...
November 14, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/29116129/evaporation-of-a-sessile-water-drop-and-a-drop-of-aqueous-salt-solution
#13
S Y Misyura
The influence of various factors on the evaporation of drops of water and aqueous salt solution has been experimentally studied. Typically, in the studies of drop evaporation, only the diffusive vapor transfer, radiation and the molecular heat conduction are taken into account. However, vapor-gas convection plays an important role at droplet evaporation. In the absence of droplet boiling, the influence of gas convection turns out to be the prevailing factor. At nucleate boiling, a prevailing role is played by bubbles generation and vapor jet discharge at a bubble collapse...
November 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29110292/development-of-chitosan-based-ph-sensitive-polymeric-micelles-containing-curcumin-for-colon-targeted-drug-delivery
#14
Thisirak Woraphatphadung, Warayuth Sajomsang, Theerasak Rojanarata, Tanasait Ngawhirunpat, Prasopchai Tonglairoum, Praneet Opanasopit
pH-sensitive N-naphthyl-N,O-succinyl chitosan (NSCS) and N-octyl-N,O-succinyl chitosan (OSCS) polymeric micelles carriers have been developed to incorporate curcumin (CUR) for colon-targeted drug delivery. The physical entrapment methods (dialysis, co-solvent evaporation, dropping, and O/W emulsion) were applied. The CUR-loaded micelles prepared by the dialysis method presented the highest loading capacity. Increasing initial amount of CUR from 5 to 40 wt% to polymer resulted in the increase in loading capacity of the polymeric micelles...
November 6, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/29090296/recent-advances-in-droplet-wetting-and-evaporation
#15
REVIEW
D Brutin, V Starov
The wetting of solid surfaces using liquid droplets has been studied since the early 1800s. Thomas Young and Pierre-Simon Laplace investigated the wetting properties, as well as the role of the contact angle and the coupling of a liquid and solid, on the contact angle formation. The geometry of a sessile droplet is relatively simple. However, it is sufficiently complex to be applied for solving and prediction of real-life situations (for example, metallic inks for inkjet printing, the spreading of pesticides on leaves, the dropping of whole blood, the spreading of blood serum, and drying for medical applications)...
November 1, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/29055238/patterns-produced-by-dried-droplets-of-protein-binary-mixtures-suspended-in-water
#16
Yojana J P Carreón, Jorge González-Gutiérrez, M I Pérez-Camacho, Hilda Mercado-Uribe
Patterns formed by the evaporation of a drop containing biological molecules have provided meaningful information about certain pathologies. In this context, several works propose the study of protein solutions as a model to understand the formation of deposits of biological fluids. Generally, dry droplets of proteins in a saline solution create complex aggregates. Here, we present an experimental study on the formation of patterns produced by the evaporation of droplet suspensions containing a protein binary mixture...
October 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28984439/enhanced-quality-factor-label-free-biosensing-with-micro-cantilevers-integrated-into-microfluidic-systems
#17
Tadas Kartanas, Victor Ostanin, Pavan Kumar Challa, Ronan Daly, Jerome Charmet, Tuomas P J Knowles
Microelectromechanical systems (MEMS) have enabled the development of a new generation of sensor platforms. Acoustic sensor operation in liquid, the native environment of biomolecules, causes, however, significant degradation of sensing performance due to viscous drag and relies on the availability of capture molecules to bind analytes of interest to the sensor surface. Here, we describe a strategy to interface MEMS sensors with microfluidic platforms through an aerosol spray. Our sensing platform comprises a microfluidic spray nozzle and a microcantilever array operated in dynamic mode within a closed loop oscillator...
November 3, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28984133/evaporative-optical-marangoni-assembly-tailoring-the-three-dimensional-morphology-of-individual-deposits-of-nanoparticles-from-sessile-drops
#18
Manos Anyfantakis, Subramanyan Namboodiri Varanakkottu, Sergii Rudiuk, Mathieu Morel, Damien Baigl
We have recently devised the evaporative optical Marangoni assembly (eOMA), a novel and versatile interfacial flow-based method for directing the deposition of colloidal nanoparticles (NPs) on solid substrates from evaporating sessile drops along desired patterns using shaped UV light. Here, we focus on a fixed UV spot irradiation resulting in a cylinder-like deposit of assembled particles and show how the geometrical features of the single deposit can be tailored in three dimensions by simply adjusting the optical conditions or the sample composition, in a quantitative and reproducible manner...
October 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28945345/a-design-of-solid-state-li-s-cell-with-evaporated-lithium-anode-to-eliminate-shuttle-effects
#19
Yujie Hao, Sheng Wang, Feng Xu, Yijie Liu, Ningning Feng, Ping He, Haoshen Zhou
Li-S batteries hold great potential for energy storage systems due to their high theoretical capacity and low cost. However, the shuttle of polysulfides in conventional Li-S batteries with organic electrolyte results in severe problems, such as low Coulombic efficiency and poor cycling stability. Here, we developed a solid-state Li-S battery using Li1.5Al0.5Ge1.5(PO4)3 (LAGP) solid ceramic electrolyte instead of liquid electrolyte. Lithium film was deposited on one side of LAGP by an evaporation method to improve the contact between anode and LAGP...
October 4, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28942167/cracks-in-dried-deposits-of-hematite-ellipsoids-interplay-between-magnetic-and-hydrodynamic-torques
#20
Hisay Lama, Ranajit Mondal, Madivala G Basavaraj, Dillip K Satapathy
The orientation and morphology of cracks in coffee-ring like particulate deposit obtained by drying sessile drops containing anisotropic magnetic particles strongly depends on the magnitude of the applied magnetic field and its direction. This opens up the possibility of tuning the micro-structure of cracks via suitable manipulation of magnetic and hydrodynamic torques on the particles which has potential applications in nano-fabrication and field driven self-assembly. We report a systematic study of magnetic field driven self-assembly of hematite ellipsoids in sessile drops dried on solid substrates and resulting crack patterns...
January 15, 2018: Journal of Colloid and Interface Science
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