A new viscous media to determine micromixing efficiency using the Villermaux‐Dushman reaction

2020 ◽  
Vol 92 (9) ◽  
pp. 1363-1363
Author(s):  
E. Arian ◽  
W. Pauer
Keyword(s):  
Viscous Media ◽  
Dushman Reaction

scholarly journals Sucrose solution as a new viscous test fluid with tunable viscosities up to 2 Pas for micromixing characterization by the Villermaux–Dushman reaction

2021 ◽  
Author(s):  
Elias Arian ◽  
Werner Pauer
Keyword(s):  
Sucrose Solution ◽  
Viscous Medium ◽  
Stirred Tank ◽  
Test Fluid ◽  
Tank Reactor ◽  
Experimental Implementation ◽  
Sucrose Solutions ◽  
Viscous Solution ◽  
First Time ◽  
Dushman Reaction

AbstractFor the first time, micromixing characterization for the Villermaux–Dushman reaction could be performed with a non-reactive viscous medium at viscosities up to 2 Pas. As viscous medium, sucrose solution was used with the benefit of being a Newtonian fluid with tuneable viscosity. Due to the higher viscosities in comparison to established media for micromixing investigations, a new protocol for the experimental implementation was developed. Micromixing experiments were conducted and the applicability of viscous sucrose solutions was proven in a stirred tank reactor. Major challenges in characterizing micromixing efficiency in high viscous solution were consolidated.

Effect of Dynamic Soft Elasticity on Vibration of Embedded Nematic Elastomer Timoshenko Beams

2018 ◽  
Vol 10 (05) ◽  
pp. 1850058 ◽  
Author(s):  
Dong Zhao ◽  
Ying Liu
Keyword(s):  
Low Frequency ◽  
Beam Theory ◽  
Timoshenko Beams ◽  
Analysis Method ◽  
Anisotropic Parameter ◽  
Nematic Elastomer ◽  
Dissipation Mechanism ◽  
Viscous Media ◽  
Complex Modal Analysis ◽  
Soft Elasticity

This paper addresses the transverse vibration of a nematic elastomer (NE) beam embedded in soft viscoelastic surroundings with the aim to clarify a new dissipation mechanism caused by dynamic soft elasticity of this soft material. Based on the viscoelasticity theory of NEs in low-frequency limit and the Timoshenko beam theory, the governing equation of motion is derived by using the Hamilton principle and energy method, and is solved by the complex modal analysis method. The dependence of vibration property on the intrinsic parameters of NEs (director rotation time, rubber relaxation time, anisotropic parameter) and foundation (spring, shear and damping constants) are discussed in detail. The results show that dynamic soft elasticity leads to anomalous anisotropy of energy transfer and attenuation. The relative stiffer foundation would restraint the rubber dissipation of viscoelastic beams, but has less influence on the director rotation dissipation, which is particular for NE beams. This study would provide a useful guidance in the dynamic design of NE apparatus embedded in soft viscous media.

Intramolecular and reorientation dynamics of bis(triphenylphosphine)-3,6-di-tert-butyl-4,5-dimethoxy-o-semiquinone complex of copper(I) in viscous media

1996 ◽  
Vol 255 (1-3) ◽  
pp. 156-162 ◽  
Author(s):  
Rakhim R. Rakhimov ◽  
Nikolas P. Benetis ◽  
Anders Lund ◽  
Jimmy S. Hwang ◽  
Alexander I. Prokof'ev ◽  
...  
Keyword(s):  
Tert Butyl ◽  
Viscous Media ◽  
Reorientation Dynamics

Spectral, lifetime and photochemical characteristics of 4-acetoxy-chalcone in viscous media

1994 ◽  
Vol 50 (7) ◽  
pp. 1227-1233 ◽  
Author(s):  
Samy A. El-Daly ◽  
El-Zeiny M. Ebied ◽  
Guy Duportail
Keyword(s):  
Viscous Media

O-228 The SSRI antidepressant Sertraline inhibits CatSper calcium channels in human sperm

2021 ◽  
Vol 36 (Supplement_1) ◽  
Author(s):  
R Rahban ◽  
A Rehfeld ◽  
C Schiffer ◽  
C Brenker ◽  
D. Louise Egeberg Palme ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Human Sperm ◽  
Fertilization Process ◽  
Acrosomal Exocytosis ◽  
Depth Analysis ◽  
Sperm Penetration ◽  
Viscous Media ◽  
Voltage Activation

Abstract Study question Do Selective Serotonin Reuptake Inhibitor (SSRI) antidepressants affect the function of human sperm? Summary answer The SSRI-antidepressant Sertraline (e.g. Zoloft) inhibits the sperm-specific Ca2+ channel CatSper and affects human sperm function in vitro. What is known already In human sperm, CatSper translates changes of the chemical microenvironment into changes of the intracellular Ca2+ concentration ([Ca2+]i) and swimming behavior. CatSper is promiscuously activated by oviductal ligands, but also by synthetic chemicals that might disturb the fertilization process. It is well known that SSRIs have off-target actions on Ca2+, Na+, and K+ channels in somatic cells. Whether SSRIs affect the activity of CatSper is, however, unknown. Study design, size, duration We studied the action of the seven drugs belonging to the most commonly prescribed class of antidepressants, SSRIs, on resting [Ca2+]i and Ca2+ influx via CatSper in human sperm. The SSRI Sertraline was selected for in-depth analysis of its action on steroid-, prostaglandin-, pH-, and voltage-activation of human CatSper. Moreover, the action of Sertraline on sperm acrosomal exocytosis and penetration into viscous media was evaluated. Participants/materials, setting, methods The activity of CatSper was investigated in sperm of healthy volunteers, using kinetic Ca2+ fluorimetry and patch-clamp recordings. Acrosomal exocytosis was investigated using Pisum sativum agglutinin (PSA) and image cytometry. Sperm penetration in viscous media was evaluated using the Kremer test. Main results and the role of chance Four SSRIs increased [Ca2+]i, two out of which also attenuated ligand-induced Ca2+ influx via CatSper. In contrast, Sertraline decreased [Ca2+]i and almost completely suppressed ligand-induced Ca2+ influx via CatSper. Remarkably, the drug was about four-fold more potent to suppress prostaglandin- versus steroid-induced Ca2+ influx. Sertraline also suppressed alkaline- and voltage-activation of CatSper, indicating that the drug directly inhibits human CatSper. Finally, Sertraline suppressed ligand-induced acrosome reaction and sperm penetration into viscous media. Limitations, reasons for caution This is an in vitro study. Future studies have to assess the physiological relevance in vivo. Wider implications of the findings The off-target action of Sertraline on CatSper in human sperm might impair the fertilization process. In a research setting, Sertraline may be used to selectively inhibit prostaglandin-induced Ca2+ influx. Trial registration number CRU326

scholarly journals Frequency-dependent reflections in elastic diffusive-viscous media

2018 ◽  
Vol 15 (5) ◽  
pp. 1900-1916 ◽  
Author(s):  
Haixia Zhao ◽  
Jinghuai Gao ◽  
Jigen Peng
Keyword(s):  
Frequency Dependent ◽  
Viscous Media

A Novel Approach to the Interpretation of PAL Spectra in Glycerol

2008 ◽  
Vol 607 ◽  
pp. 260-262
Author(s):  
Sergey V. Stepanov ◽  
Dmitry Zvezhinskiy ◽  
Gilles Duplâtre ◽  
Vsevolod Byakov ◽  
V.S. Subrahmanyam
Keyword(s):  
Positron Annihilation ◽  
Rate Constants ◽  
Reaction Rate ◽  
Volume Distribution ◽  
Viscous Liquids ◽  
Positron Annihilation Lifetime ◽  
Reaction Rate Constants ◽  
Novel Approach ◽  
New Strategy ◽  
Viscous Media

A new strategy for the treatment of positron annihilation lifetime (PAL) spectra in viscous liquids is proposed, enabling to extract values of the Ps reaction rate constants with intratrack radiolytic products as well as parameters of the free volume distribution in viscous media.

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