scholarly journals A Method for Simultaneous Polishing and Hydrophobization of Polycarbonate for Microfluidic Applications

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2490
Author(s):  
Dominika Ogończyk ◽  
Paweł Jankowski ◽  
Piotr Garstecki
Keyword(s):  
Aqueous Solutions ◽  
Chemical Polishing ◽  
Optical Transparency ◽  
Cross Contamination ◽  
Surface Rendering ◽  
Microfluidic Systems ◽  
Two Phase

Here we present a new methodology for chemical polishing of microchannels in polycarbonate (PC). Tuning the time of exposition and the concentration of ammonia, the roughness arising from the micromachining process can be significantly reduced or completely removed while preserving the structure of microchannels. Besides smoothing out the surface, our method modifies the wettability of the surface, rendering it hydrophobic. The method increases the optical transparency of microchannels and eliminates undesired effects in two-phase microfluidic systems, including wetting by aqueous solutions and cross-contamination between aqueous droplets that could otherwise shed satellites via pinning.

Horseradish peroxidase/catalase-mediated cell-laden alginate-based hydrogel tube production in two-phase coaxial flow of aqueous solutions for filament-like tissues fabrication

2013 ◽  
Vol 5 (1) ◽  
pp. 015012 ◽  
Author(s):  
Shinji Sakai ◽  
Yang Liu ◽  
Emma Jane Mah ◽  
Masahito Taya
Keyword(s):  
Horseradish Peroxidase ◽  
Aqueous Solutions ◽  
Tube Production ◽  
Two Phase

Gas Solubility in Aqueous Solutions Under Two-Phase (H–Lw) Hydrate Equilibrium Conditions

2015 ◽  
pp. 205-212
Author(s):  
Ioannis N. Tsimpanogiannis ◽  
Ioannis G. Economou ◽  
Athanassios K. Stubos
Keyword(s):  
Aqueous Solutions ◽  
Gas Solubility ◽  
Equilibrium Conditions ◽  
Two Phase

Comparative Study of Two-Phase Gas-Liquid Flow in the Ejector Induced Upflow and Downflow Bubble Column

2005 ◽  
Vol 3 (1) ◽  
Author(s):  
Ajay Mandal ◽  
Gautam Kundu ◽  
Dibyendu Mukherjee
Keyword(s):  
Mass Transfer ◽  
Comparative Study ◽  
Aqueous Solutions ◽  
Bubble Column ◽  
Methyl Cellulose ◽  
Stable Operation ◽  
Transfer Coefficients ◽  
Two Phase ◽  
Mass Transfer Coefficients ◽  
Frictional Pressure Drop

A comparative study has been made on the hydrodynamics and gas-liquid mass transfer performances of upflow and downflow bubble columns. Gas-liquid distributions in the column are made by an ejector system using liquid as motive fluid and gas is used as secondary fluid for both the cases. The two-phase hydrodynamic studies have been done with water and aqueous solutions of carboxy methyl cellulose at different concentrations and air as gas phase. The volumetric mass transfer coefficients have been measured by absorbing air-carbon dioxide mixture in aqueous solutions of sodium carbonate and bicarbonate. For downflow system, experiments are carried out at natural suction of air through the ejector; whereas for upflow system, air is forced through the secondary entrance of the ejector from a high pressure tank at any desired rate. The effect of gas and liquid flowrates on gas holdup, frictional pressure drop and mass transfer coefficients have been investigated. All the experiments have been performed in the homogeneous flow regime for a stable operation.

scholarly journals Hydrodynamic studies on liquid-liquid two phase flow separation in microchannel by computational fluid dynamic modelling

2021 ◽  
Vol 4 (2) ◽  
pp. first
Author(s):  
Chue Cui Ting ◽  
Afiq Mohd Laziz ◽  
Khoa Dang Dang Bui ◽  
Ngoc Thi Nhu Nguyen ◽  
Pha Ngoc Bui ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Fluid Model ◽  
Volume Of Fluid ◽  
Rapid Expansion ◽  
Separation Performance ◽  
Microfluidic Systems ◽  
Two Phase ◽  
Volume Of Fluid Model ◽  
Simulation Results ◽  
Methanol System

Microfluidic systems undergo rapid expansion of its application in different industries over the few decades as its surface tension-dominated property provides better mixing and improves mass transfer between two immiscible liquids. Synthesis of biodiesel via transesterification of vegetable oil and methanol in microfluidic systems by droplet flow requires separation of the products after the reaction occurred. The separation technique for multiphase fluid flow in the microfluidic system is different from the macro-system, as the gravitational force is overtaken by surface force. To understand these phenomena completely, a study on the hydrodynamic characteristics of two-phase oil-methanol system in microchannel was carried out. A multiphase Volume of Fluid model was developed to predict the fluid flow in the microchannel. An inline separator design was proposed along with its variable to obtain effective separation for the oil-methanol system. The separation performance was evaluated based on the amount of oil recovered and its purity. The capability of the developed model has been validated through a comparison of simulation results with published experiment. It was predicted that the purity of recovered oil was increased by more than 46% when the design with side openings arranged at both sides of the microchannel. The highest percentage recovery of oil from the mixture was simulated at 91.3% by adding the number of side openings to ensure the maximum recovery. The oil that was separated by the inline separator was predicted to be at 100% purity, which indicates that no methanol contamination throughout the separation process. The purity of the separated product can be increased by manipulating the pressure drop across the side openings. Hence, it can be concluded that the separation in a large diameter microchannel system is possible and methodology can be tuned to achieve the separation goal. Finally, the simulation results showed that the present volume of fluid model had a good agreement with the published experiment.

Reduction of Pu(IV) by carbohydrazide in aqueous solutions and in two-phase systems with tributyl phosphate

2015 ◽  
Vol 304 (1) ◽  
pp. 201-206 ◽  
Author(s):  
V. N. Alekseenko ◽  
K. N. Dvoeglazov ◽  
V. I. Marchenko ◽  
S. N. Alekseenko ◽  
V. I. Volk ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Tributyl Phosphate ◽  
Two Phase ◽  
Phase Systems

scholarly journals The extraction of Zn(II) in aqueous PEG (1550)-(NH4)2SO4 two-phase system using Cl- ions as extracting agent

2007 ◽  
Vol 72 (3) ◽  
pp. 289-297 ◽  
Author(s):  
Laura Bulgariu ◽  
Dumitru Bulgariu
Keyword(s):  
Aqueous Solutions ◽  
Extraction Efficiency ◽  
Phase Variation ◽  
Chloride Ions ◽  
Phase System ◽  
Two Phase ◽  
Rich Phase ◽  
Experimental Parameters ◽  
Aqueous Two Phase Systems ◽  
Phase Systems

The extraction of Zn(II) in an aqueous PEG (1550) - (NH4)2SO4 two-phase system as a function of several experimental parameters was studied. PEG-based aqueous two-phase systems are composed of two immiscible phases: a polymer-rich phase and a salt-rich phase, which can be used for extraction experiments. In the absence of a suitable extracting agent, for the system consisting of a mixture of equal volumes of 40 mass% PEG and 40 mass% (NH4)2SO4 aqueous solutions, Zn(II) remained predominantly in the salt-rich phase. Variation of the pH of the salt stock solution did not change very much the extraction efficiency. By adding chloride ions, an enhancement of the Zn(II) extraction was observed. The Zn(II) extraction efficiency in presence of Cl- depends on the acidity of the salt stock solution and on the concentration of chloride ions added into the system.

scholarly journals Simultaneous Extraction, Enrichment and Removal of Dyes from Aqueous Solutions Using a Magnetic Aqueous Micellar Two-Phase System

2017 ◽  
Vol 7 (12) ◽  
pp. 1257 ◽  
Author(s):  
Shuanggen Wu ◽  
Danyu Sun ◽  
Chaoyun Wang ◽  
Yuanru Yang ◽  
Fenfang Li ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Phase System ◽  
Two Phase ◽  
Simultaneous Extraction
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