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https://www.readbyqxmd.com/read/28088134/dirac-bubble-potential-for-he-he-and-inadequacies-in-the-continuum-comparing-an-analytic-model-with-elastic-collision-experiments
#1
Michael Chrysos
We focus on the long-pending issue of the inadequacy of the Dirac bubble potential model in the description of He-He interactions in the continuum [L. L. Lohr and S. M. Blinder, Int. J. Quantum Chem. 53, 413 (1995)]. We attribute this failure to the lack of a potential wall to mimic the onset of the repulsive interaction at close range separations. This observation offers the explanation to why this excessively simple model proves incapable of quantitatively reproducing previous experimental findings of glory scattering in He-He, although being notorious for its capability of reproducing several distinctive features of the atomic and isotopic helium dimers and trimers [L...
January 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28079380/extraordinarily-rapid-rise-of-tiny-bubbles-sliding-beneath-superhydrophobic-surfaces
#2
Cyuan-Jhang Wu, Cheng-Chung Chang, Yu-Jane Sheng, Heng-Kwong Tsao
Tiny bubbles readily stick onto substrates and remain static due to contact angle hysteresis (CAH). Nevertheless, tiny bubbles can slide slowly on a tilted surface with ultralow CAH since capillarity is overcome by buoyancy. It is surprising to observe experimentally that bubbles of 3~15 μl (diameter 1.79~3.06 mm) slide beneath a tilted superhydrophobic surface at a vertical ascent rate faster than freely rising ones of high Reynold numbers ~O(10(2)). As the tilted angle increases, the drag coefficient remains essentially the same as that of a freely rising bubble but the frontal area of the flat bubble rises monotonically...
January 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28078627/nanostructured-materials-synthesis-using-ultrasound
#3
REVIEW
Jordan J Hinman, Kenneth S Suslick
Recent applications of ultrasound to the production of nanostructured materials are reviewed. Sonochemistry permits the production of novel materials or provides a route to known materials without the need for high bulk temperatures, pressures, or long reaction times. Both chemical and physical phenomena associated with high-intensity ultrasound are responsible for the production or modification of nanomaterials. Most notable are the consequences of acoustic cavitation: the formation, growth, and implosive collapse of bubbles, and can be categorized as primary sonochemistry (gas-phase chemistry occurring inside collapsing bubbles), secondary sonochemistry (solution-phase chemistry occurring outside the bubbles), and physical modifications (caused by high-speed jets, shockwaves, or inter-particle collisions in slurries)...
February 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28076561/visual-outcomes-after-deep-anterior-lamellar-keratoplasty-using-donor-corneas-without-removal-of-descemet-membrane-and-endothelium
#4
Tatiana Moura Bastos Prazeres, Rodrigo Muller, Tatiana Rayes, Flavio Eduardo Hirai, Luciene Barbosa de Sousa
Purpose: The optical quality of the interface after deep anterior lamellar keratoplasty (DALK) using the big-bubble technique has been shown to be excellent, leading to results comparable to penetrating keratoplasty. However, there is little in the literature with respect to the controversy surrounding the preparation of the donor cornea. The purpose of this study was to evaluate visual acuity (VA) in patients with keratoconus who underwent DALK without removal of the donor graft endothelium...
November 2016: Arquivos Brasileiros de Oftalmologia
https://www.readbyqxmd.com/read/28075119/bubble-driven-detachment-of-bacteria-from-confined-microgeometries
#5
Sepideh Khodaparast, Minyoung Kevin Kim, Justin E Silpe, Howard A Stone
Moving air-liquid interfaces, for example, bubbles, play a significant role in the detachment and transport of colloids and microorganisms in confined systems as well as unsaturated porous media. Moreover, they can effectively prevent and/or postpone the development of mature biofilms on surfaces that are colonized by bacteria. Here we demonstrate the dynamics and quantify the effectiveness of this bubble-driven detachment process for the bacterial strain Staphylococcus aureus. We investigate the effects of interface velocity and geometrical factors through microfluidic experiments that mimic some of the confinement features of pore-scale geometries...
January 11, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28074925/atomization-of-high-viscosity-fluids-for-aromatherapy-using-micro-heaters-for-heterogeneous-bubble-nucleation
#6
Junhui Law, Ka Wai Kong, Ho-Yin Chan, Winston Sun, Wen Jung Li, Eric Boa Fung Chau, George Kak Man Chan
The development of a novel lead-free microelectromechanical-system (MEMS)-based atomizer using the principle of thermal bubble actuation is presented. It is a low-cost, lead-free design that is environmentally friendly and harmless to humans. It has been tested to be applicable over a wide range of fluid viscosities, ranging from 1 cP (e.g., water) to 200 cP (e.g., oil-like fluid) at room temperature, a range that is difficult to achieve using ordinary atomizers. The results demonstrate that the average power consumption of the atomizer is approximately 1 W with an atomization rate of 0...
January 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28074195/harnessing-the-advantages-of-hard-and-soft-colloids-by-the-use-of-core-shell-particles-as-interfacial-stabilizers
#7
C Buchcic, R H Tromp, M B J Meinders, M A Cohen Stuart
The ability of colloidal particles to penetrate fluid interfaces is a crucial factor in the preparation of particle stabilized disperse systems such as foams and emulsions. For hard micron-sized particles the insertion into fluid interfaces requires substantial energy input, but soft particles are known to adsorb spontaneously. Particle hardness, however, may also affect foam and emulsion stability. The high compliance of soft particles may compromise their ability to withstand the lateral compression associated with disproportionation...
January 11, 2017: Soft Matter
https://www.readbyqxmd.com/read/28073560/an-alternative-explanation-for-cyanobacterial-scum-formation-and-persistence-by-oxygenic-photosynthesis
#8
E Aparicio Medrano, R E Uittenbogaard, B J H van de Wiel, L M Dionisio Pires, H J H Clercx
The cause of persistent cyanobacteria scum formation in lakes is an unresolved subject. Scum refers to the event in which cyanobacteria are at the water surface of a lake. Factors like low turbulence levels, long day-light, high water temperatures and the buoyant capacity of cyanobacterial cells play a role in the occurrence of scums. However, they do not explain why scums are observed at periods during the day when according to theory they should have disappeared into the deeper water layers. In this study, we present an alternative explanation...
December 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073029/multiplexed-efficient-on-chip-sample-preparation-and-sensitive-amplification-free-detection-of-ebola-virus
#9
K Du, H Cai, M Park, T A Wall, M A Stott, K J Alfson, A Griffiths, R Carrion, J L Patterson, A R Hawkins, H Schmidt, R A Mathies
An automated microfluidic sample preparation multiplexer (SPM) has been developed and evaluated for Ebola virus detection. Metered air bubbles controlled by microvalves are used to improve bead-solution mixing thereby enhancing the hybridization of the target Ebola virus RNA with capture probes bound to the beads. The method uses thermally stable 4-formyl benzamide functionalized (4FB) magnetic beads rather than streptavidin coated beads with a high density of capture probes to improve the target capture efficiency...
January 3, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28072580/in-vivo-real-time-cavitation-imaging-in-moving-organs
#10
B Arnal, J Baranger, C Demene, M Tanter, M Pernot
The stochastic nature of cavitation implies visualization of the cavitation cloud in real-time and in a discriminative manner for the safe use of focused ultrasound therapy. This visualization is sometimes possible with standard echography, but it strongly depends on the quality of the scanner, and is hindered by difficulty in discriminating from highly reflecting tissue signals in different organs. A specific approach would then permit clear validation of the cavitation position and activity. Detecting signals from a specific source with high sensitivity is a major problem in ultrasound imaging...
January 10, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28071757/new-insights-into-the-gins-complex-explain-the-controversy-between-existing-structural-models
#11
Marta Carroni, Matteo De March, Barbara Medagli, Ivet Krastanova, Ian A Taylor, Heinz Amenitsch, Hiroyuchi Araki, Francesca M Pisani, Ardan Patwardhan, Silvia Onesti
GINS is a key component of eukaryotic replicative forks and is composed of four subunits (Sld5, Psf1, Psf2, Psf3). To explain the discrepancy between structural data from crystallography and electron microscopy (EM), we show that GINS is a compact tetramer in solution as observed in crystal structures, but also forms a double-tetrameric population, detectable by EM. This may represent an intermediate step towards the assembly of two replicative helicase complexes at origins, moving in opposite directions within the replication bubble...
January 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28070749/an-automated-microemboli-detection-and-classification-system-using-backscatter-rf-signals-and-differential-evolution
#12
Karim Ferroudji, Nabil Benoudjit, Ayache Bouakaz
Embolic phenomena, whether air or particulate emboli, can induce immediate damages like heart attack or ischemic stroke. Embolus composition (gaseous or particulate matter) is vital in predicting clinically significant complications. Embolus detection using Doppler methods have shown their limits to differentiate solid and gaseous embolus. Radio-frequency (RF) ultrasound signals backscattered by the emboli contain additional information on the embolus in comparison to the traditionally used Doppler signals...
January 9, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28069503/wettability-gradient-on-the-elytra-in-the-aquatic-beetle-cybister-chinensis-and-its-role-in-angular-position-of-the-beetle-at-water-air-interface
#13
Mingxia Sun, Yuan Chen, Yongmei Zheng, Mingming Zhen, Chunying Shu, Zhendong Dai, Aiping Liang, Stanislav N Gorb
: The surface of the elytra in some species of aquatic beetles displays relatively low contact angles (CAs), even showing hydrophilic properties. In this study, we report on an observation that both sexes of Cybister chinensis beetle fresh elytral surface do not exhibit uniform CA, but rather a wettability gradient along the longitudinal axis in posterior direction. The wettability is very different between females and males due to the presence (female) or absence (male) of channels on the elytral surface...
January 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28069239/analysis-of-the-effect-of-impact-of-near-wall-acoustic-bubble-collapse-micro-jet-on-al-1060
#14
Linzheng Ye, Xijing Zhu
The bubble collapse near a wall will generate strong micro-jet in a liquid environment under ultrasonic field. To explore the effect of the impact of near-wall acoustic bubble collapse micro-jet on an aluminum 1060 sheet, the cavitation threshold formula and micro-jet velocity formula were first proposed. Then the Johnson-Cook rate correlation material constitutive model was considered, and a three-dimensional fluid-solid coupling model of micro-jet impact on a wall was established and analyzed. Finally, to validate the model, ultrasonic cavitation test and inversion analysis based on the theory of spherical indentation test were conducted...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069230/acoustic-microbubble-dynamics-with-viscous-effects
#15
Kawa Manmi, Qianxi Wang
Microbubble dynamics subject to ultrasound are associated with important applications in biomedical ultrasonics, sonochemistry and cavitation cleaning. The viscous effects in this phenomenon is essential since the Reynolds number Re associated is about O(10). The flow field is characterized as being an irrotational flow in the bulk volume but with a thin vorticity layer at the bubble surface. This paper investigates the phenomenon using the boundary integral method based on the viscous potential flow theory...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069209/superhydrophobic-silica-nanoparticles-as-ultrasound-contrast-agents
#16
Qiaofeng Jin, Chih-Yu Lin, Shih-Tsung Kang, Yuan-Chih Chang, Hairong Zheng, Chia-Min Yang, Chih-Kuang Yeh
Microbubbles have been widely studied as ultrasound contrast agents for diagnosis and as drug/gene carriers for therapy. However, their size and stability (lifetime of 5-12min) limited their applications. The development of stable nanoscale ultrasound contrast agents would therefore benefit both. Generating bubbles persistently in situ would be one of the promising solutions to the problem of short lifetime. We hypothesized that bubbles could be generated in situ by providing stable air nuclei since it has been found that the interfacial nanobubbles on a hydrophobic surface have a much longer lifetime (orders of days)...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069203/drastic-acceleration-of-fibrillation-of-insulin-by-transient-cavitation-bubble
#17
Kichitaro Nakajima, Daisuke Nishioka, Masahiko Hirao, Masatomo So, Yuji Goto, Hirotsugu Ogi
Amyloid-fibril formation of proteins can be accelerated by ultrasonic irradiation to the peptide solutions. Although this phenomenon contributes to understanding pathogenic behavior of amyloidosis, its physical mechanism has not been clarified, because several factors (cavitation, temperature increase, stirring effect, and so on) related to ultrasonic irradiation can participate in the fibrillation reaction. Here, we independently study contributions of the possible factors, using insulin, which is extremely stable and then suitable for the mechanism clarification...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069192/acoustic-cavitation-induced-generation-of-stabilizer-free-extremely-stable-reduced-graphene-oxide-nanodispersion-for-efficient-delivery-of-paclitaxel-in-cancer-cells
#18
Renu Geetha Bai, Kasturi Muthoosamy, Fiona Natalia Shipton, Sivakumar Manickam
Graphene is one of the highly explored nanomaterials due to its unique and extraordinary properties. In this study, by utilizing a hydrothermal reduction method, graphene oxide (GO) was successfully converted to reduced graphene oxide (RGO) without using any toxic reducing agents. Following this, with the use of ultrasonic cavitation, profoundly stable few layer thick RGO nanodispersion was generated without employing any stabilizers or surfactants. During ultrasonication, shockwaves from the collapse of bubbles cause a higher dispersing energy to the graphene nanosheets which surpass the forces of Van der Waal's and π-π stacking and thus pave the way to form a stable aqueous nanodispersion of graphene...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28068443/possible-risk-factors-and-clinical-effects-of-opaque-bubble-layer-in-small-incision-lenticule-extraction-smile
#19
Gisung Son, Junghyun Lee, Cheolwon Jang, Ki Yong Choi, Beom Jin Cho, Tae Hyung Lim
PURPOSE: To report the development of an opaque bubble layer (OBL) during small incision lenticule extraction (SMILE) and analyze its potential risk factors and the clinical outcome. METHODS: A retrospective review of medical records was performed. The patients were divided into two groups in terms of OBL area following a posterior lenticule cut: OBL less than 5% of cornea and OBL greater than 5% of cornea. Preoperative parameters and clinical outcomes were compared...
January 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28068442/oct-study-of-the-femtosecond-laser-opaque-bubble-layer
#20
Gustavo K Marino, Marcony R Santhiago, Steven E Wilson
PURPOSE: To characterize the location and regularity of the opaque bubble layer (OBL) in the corneal stroma after femtosecond laser-assisted LASIK (FS-LASIK) flap generation. METHODS: In this prospective study, 30 eyes of 15 patients who had FS-LASIK surgery for myopia, astigmatism, and/or hyperopia were included. Screen captures were obtained at the end of the flap creation and the eyes with hard type OBL were immediately imaged with anterior segment optical coherence tomography...
January 1, 2017: Journal of Refractive Surgery
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