Role of Air Bubbles Overlooked in the Adsorption of Perfluorooctanesulfonate on Hydrophobic Carbonaceous Adsorbents

2014 ◽  
Vol 48 (23) ◽  
pp. 13785-13792 ◽  
Author(s):  
Pingping Meng ◽  
Shubo Deng ◽  
Xinyu Lu ◽  
Ziwen Du ◽  
Bin Wang ◽  
...  
Keyword(s):  
Air Bubbles ◽  
Carbonaceous Adsorbents

scholarly journals Internal melt figures in ice by rapid adiabatic compression

1994 ◽  
Vol 40 (134) ◽  
pp. 132-134
Author(s):  
R.E. Gagnon ◽  
C. Tulk ◽  
H. Kiefte
Keyword(s):  
Phase Transformations ◽  
Grain Boundaries ◽  
Single Crystals ◽  
Adiabatic Compression ◽  
Air Bubbles ◽  
Water Ice ◽  
Deep Focus ◽  
And Behavior ◽  
First Time

AbstractSingle crystals and bicrystals of water ice have been adiabatically pressurized to produce, and clearly illustrate, two types of internal melt figures: (1) dendritic figures that grow from nucleation imperfections on the specimen’s surface, or from air bubbles at grain boundaries, into the ice as pressure is elevated; and (2) compression melt fractures, flat liquid-filled disks, that nucleate at imperfections in the crystal and grow with the application of pressure eventually to sprout dendritic fingers at the periphery. The transparency of the ice permitted visualization of the growth and behavior of the figures, and this could be an important tool in understanding the role of phase transformations in deep-focus earthquakes. Correlation between figure size and pressure is noted for the first time.

Role of air bubbles in the breakdown of flowing transformer oil

2020 ◽  
Vol 27 (5) ◽  
pp. 1752-1760
Author(s):  
Yongze Zhang ◽  
Xiantao Tao ◽  
Cheng Pan ◽  
Ju Tang
Keyword(s):  
Transformer Oil ◽  
Air Bubbles

Role of oceanic air bubbles in atmospheric correction of ocean color imagery

2002 ◽  
Vol 41 (12) ◽  
pp. 2202 ◽  
Author(s):  
Banghua Yan ◽  
Bingquan Chen ◽  
Knut Stamnes
Keyword(s):  
Ocean Color ◽  
Atmospheric Correction ◽  
Air Bubbles ◽  
Ocean Color Imagery ◽  
Color Imagery

scholarly journals The Hearing Test: Evidence of a Vegetal Entity

2020 ◽  
Vol 30 ◽  
pp. 85-89
Author(s):  
Laura Beloff
Keyword(s):  
High Frequency ◽  
Air Bubbles ◽  
Plant Intelligence ◽  
Hearing Test ◽  
Experimental Approaches ◽  
Species Specific ◽  
Extended Reflection ◽  
Lack Of Knowledge

The author's artistic experiment The Hearing Test focuses on detection of high frequency clicking sounds that are emitted by the tips of plants' roots. Scientists have claimed that plants' roots produce high frequency clicks between 20 and 300 kHz by bursting air bubbles. But while the phenomenon has been described, its cause remains unexplained. This lack of knowledge opens up possibilities for multiple interpretations and invites experimental approaches as well as speculation concerning plant intelligence, the role of species-specific hearing and sound as evidence. The article is an extended reflection on the experiment.

scholarly journals The Morphology of Ice and Liquid Brine in the Environmental SEM: A Study of the Freezing Methods

2019 ◽  
Author(s):  
Ľubica Vetráková ◽  
Vilém Neděla ◽  
Jiří Runštuk ◽  
Dominik Heger
Keyword(s):  
Time Lapse ◽  
Solute Concentration ◽  
Environmental Scanning ◽  
Air Bubbles ◽  
Ice Recrystallization ◽  
Naturally Occurring ◽  
Polycrystalline Ice ◽  
Entrapped Air ◽  
The Impact

Abstract. The microstructure of polycrystalline ice with a threading solution of brine controls its numerous characteristics, including the ice mechanical properties, ice-atmosphere interactions, sea-ice albedo, and (photo)chemical behavior in/on the ice. Ice samples were previously prepared in laboratories to study various facets of ice-impurities interactions and (photo)reactions to model natural ice-impurities behavior. We examine the impact of the freezing conditions and solute (CsCl used as a proxy for naturally occurring salts) concentrations on the microscopic structure of ice samples via an environmental scanning electron microscope. The method allows us to observe in detail the ice surfaces, namely, the free ice, brine puddles, brine-containing grain boundary grooves, individual ice crystals, and imprints left by entrapped air bubbles at temperatures higher than −25 °C. The amount of brine on the external surface is found proportional to the solute concentration and is strongly dependent on the sample preparation method. Time-lapse images in the condition of slight sublimation reveal sub-surface association of air bubbles with brine. With rising temperature (up to −14 °C), the brine surface coverage increases to remain enhanced during the subsequent cooling and until the final crystallization below the eutectic temperature. The ice recrystallization dynamics identifies the role of surface spikes in retarding the ice boundaries propagation (Zeener pining). The findings thus quantify the amounts of brine exposed to incoming radiation, available for the gas exchange, and influencing other mechanical and optical properties of ice. The results have straightforward implications for artificially prepared and naturally occurring salty ices.

scholarly journals Study of the Air-Entraining Behavior Based on the Interactions between Cement Particles and Selected Cationic, Anionic and Nonionic Surfactants

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3514
Author(s):  
Qi Liu ◽  
Zhitao Chen ◽  
Yingzi Yang
Keyword(s):  
Nonionic Surfactant ◽  
Cationic Surfactant ◽  
Cementitious Materials ◽  
Solid Particles ◽  
Air Bubbles ◽  
Air Voids ◽  
Air Entraining Agents ◽  
Air Void ◽  
Positively Charged

The essential role of the air void size distribution in air-entrained cementitious materials is widely accepted. However, how the air-entraining behavior is affected by features such as the molecular structure of air-entraining agents (AEAs), the type of solid particles, or the chemical environment of the pore solution in fresh mortars is still not well understood. Besides, methods to assess the interaction between AEAs and cement particles are limited. Thus, in this study, the air-entraining behaviors of three kinds of surfactant (cationic, anionic, and nonionic) were examined. The general working mechanisms of these surfactants were studied by zeta potential and attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy. Results indicate that the cationic surfactant entrains improper coarse air voids due to the strong electrical interaction between air bubbles formed by the cationic surfactant and negatively charged cement particles. The anionic surfactant interacts with the positively charged part of cement particles, and thus entrains finer air voids. The interaction between the nonionic surfactant and cement particles is very weak; as a result, the nonionic surfactant entrains the finest and homogeneous air voids.

A fine tuning of embryo loading technique by eliminating the air bubble in the outer sheath of embryo catheter among women undergoing IVF treatment

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jasdev Singh Harbhajan Singh ◽  
Mohd Faizal Ahmad ◽  
Muhammad Azrai Abu ◽  
Mohd Hashim Omar ◽  
Abdul Kadir Abdul Karim
Keyword(s):  
Negative Impact ◽  
Implantation Rate ◽  
Oocyte Retrieval ◽  
Fine Tuning ◽  
Air Bubbles ◽  
Air Bubble ◽  
Beta Hcg ◽  
Group A ◽  
Group B

Abstract Objectives The role of air bubbles in bracketing the embryo-containing medium in inner catheter during embryo transfer (ET) has already been established. However, the role of air bubbles in outer catheter (OC) during implantation is yet to be determined. This study aimed to compare the implantation rates between women who have undergone ET with or without ASP (Vitrolife®; Sweden), a medium use for oocyte retrieval and rinsing in OC embryo catheter. The purpose of introducing the ASP medium to the OC was to eliminate air bubbles in that space during implantation. Methods A total of 312 women were randomly divided into two groups with 156 participants each group. In Group A, ASP medium was used during ET, whereas in Group B, no ASP medium was utilized. Positive implantation was defined as serum beta-hCG level >5 mIU/mL taken on the 7th day following ET. Results The average age of the majority of the participants was 30–39 years and had at least 4–5 years of subfertility. The unexplained subfertility was the prominent cause of ET failure in both groups. In most of the participants in both groups, ET was done using fresh embryo cycles with good to excellent embryo grades. After the ASP medium was manipulated in the OC in both groups, the positive implantation rate was not different in both groups (p>0.05). Conclusions The elimination of air bubbles in OC by using the ASP medium during ET did not confer an additional benefit nor exert a negative impact on implantation rate.

scholarly journals Exploring droplet impact near a millimetre-sized hole: comparing a closed pit with an open-ended pore

2015 ◽  
Vol 772 ◽  
pp. 427-444 ◽  
Author(s):  
Rianne de Jong ◽  
Oscar R. Enríquez ◽  
Devaraj van der Meer
Keyword(s):  
Impact Velocity ◽  
Crucial Role ◽  
Drop Impact ◽  
Impact Dynamics ◽  
Air Bubbles ◽  
Air Bubble ◽  
Impact Location ◽  
Impact Phenomena ◽  
The Impact

We investigate drop impact dynamics near closed pits and open-ended pores experimentally. The resulting impact phenomena differ greatly in each case. For a pit, we observe three distinct phenomena, which we denote as a splash, a jet and an air bubble, whose appearance depends on the distance between impact location and pit. Furthermore, we found that splash velocities can reach up to seven times the impact velocity. Drop impact near a pore, however, results solely in splashing. Interestingly, two distinct and disconnected splashing regimes occur, with a region of planar spreading in between. For pores, splashes are less pronounced than in the pit case. We state that, for the pit case, the presence of air inside it plays the crucial role of promoting splashing and allowing for air bubbles to appear.

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