surface tensions
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Author(s):  
Tim Laux ◽  
Jona Lelmi

AbstractWe provide a new convergence proof of the celebrated Merriman–Bence–Osher scheme for multiphase mean curvature flow. Our proof applies to the new variant incorporating a general class of surface tensions and mobilities, including typical choices for modeling grain growth. The basis of the proof are the minimizing movements interpretation of Esedoḡlu and Otto and De Giorgi’s general theory of gradient flows. Under a typical energy convergence assumption we show that the limit satisfies a sharp energy-dissipation relation.


2021 ◽  
Vol 4 (3) ◽  
pp. 100-104
Author(s):  
Ana Verena Pimentel Leal de Moraes Rego ◽  
Márcio Costa Pinto da Silva ◽  
Edna de Almeida Santos ◽  
Érika Durão Vieira

Biosurfactants are active compounds capable of reducing surface tensions produced by microorganisms, having low toxicity and high biodegradability with possible production from renewable sources. This work aims at presenting a patents search on the biosurfactants production through fermentation, using waste as substrate. The methodology consisted of searching keywords and their blending, using the database of Derwent innovation. The search returned 15 patent registrations filed in the last 8 years. Of the 15, 10 orders are active. After analysis, 3 of the 10 selected patents showed strong adherence to the subject, describing the use of waste as substrates to produce more economical biosurfactants.


2021 ◽  
Vol 342 ◽  
pp. 117445
Author(s):  
Reza Haghbakhsh ◽  
Mehrdad Taherzadeh ◽  
Ana Rita C. Duarte ◽  
Sona Raeissi

2021 ◽  
Vol 6 (10) ◽  
Author(s):  
Michiel A. Hack ◽  
Patrick Vondeling ◽  
Menno Cornelissen ◽  
Detlef Lohse ◽  
Jacco H. Snoeijer ◽  
...  

Author(s):  
Masanobu Sagisaka ◽  
Takumi Endo ◽  
Kazuki Fujita ◽  
Yasushi Umetsu ◽  
Suzuna Osaki ◽  
...  
Keyword(s):  

2021 ◽  
Vol 9 ◽  
Author(s):  
Yongcai Pan ◽  
Bing He ◽  
Binghai Wen

The existence of surface nanobubbles has already been confirmed by variable detection methods, but the mechanism of their extraordinary stability remains unclear and has aroused widespread research interest in the past 2 decades. Experiments and theoretical analyses have tried to account for these stabilities such as the very long lifetime, very high pressure and very small contact angle. Attractive hydrophobic potential was applied to complement the pinning-oversaturation theory and successfully explain the survival of surface nanobubbles in undersaturation environment by some researchers. However, the survival of nanobubbles on hydrophilic surface still requires sizeable oversaturation. In this paper, we introduce the variable surface tensions, namely Tolman-dependence and state-dependence, and show that they effectively promote the stability of nanobubbles. The decrease in surface tension can lead to larger contact angle and even make the nanobubbles survivable on the highly hydrophilic surface. In Tolman-dependence, the changing rate in the contact angle evolution slows down, which is more obvious when the bubble size is close to the Tolman length. The contact angle is also getting larger in the state-dependence, and the increase of the gas saturation degree is beneficial to the stability of surface nanobubbles. With the gas saturation ratio of 3, the bubbles on the quite hydrophilic surface can also be stable, while grow up on the hydrophobic surface. The variable surface tensions weaken the need of saturation degree for the surface nanobubbles’ stability.


2021 ◽  
Vol 11 (3) ◽  
Author(s):  
Jin Young Kim ◽  
Stefanie Heyden ◽  
Dominic Gerber ◽  
Nicolas Bain ◽  
Eric R. Dufresne ◽  
...  

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