scholarly journals Surface-Tension-Confined Channel with Biomimetic Microstructures for Unidirectional Liquid Spreading

Micromachines ◽  
2020 ◽  
Vol 11 (11) ◽  
pp. 978
Author(s):  
Yi Zhang ◽  
Yang Gan ◽  
Liwen Zhang ◽  
Deyuan Zhang ◽  
Huawei Chen
Keyword(s):  
Surface Tension ◽  
Underlying Mechanism ◽  
Structural Features ◽  
Liquid Motion ◽  
Water Separation ◽  
Lab On Chip ◽  
Liquid Spreading ◽  
Oil Water Separation ◽  
On Chip ◽  
The Stability

Unidirectional liquid spreading without energy input is of significant interest for the broad applications in diverse fields such as water harvesting, drop transfer, oil–water separation and microfluidic devices. However, the controllability of liquid motion and the simplification of manufacturing process remain challenges. Inspired by the peristome of Nepenthes alata, a surface-tension-confined (STC) channel with biomimetic microcavities was fabricated facilely through UV exposure photolithography and partial plasma treatment. Perfect asymmetric liquid spreading was achieved by combination of microcavities and hydrophobic boundary, and the stability of pinning effect was demonstrated. The influences of structural features of microcavities on both liquid spreading and liquid pinning were investigated and the underlying mechanism was revealed. We also demonstrated the spontaneous unidirectional transport of liquid in 3D space and on tilting slope. In addition, through changing pits arrangement and wettability pattern, complex liquid motion paths and microreactors were realized. This work will open a new way for liquid manipulation and lab-on-chip applications.

Analysis of Capillary Filling in Micro Channels for Passive Fluid Dynamics in Nano Lab on Chip Domain

2013 ◽  
Vol 832 ◽  
pp. 506-510
Author(s):  
Tijjani Adam ◽  
U. Hashim ◽  
T.S. Dhahi ◽  
M. Wesam Al-Mufti ◽  
Khaled Emraje Mohamed Elderjy
Keyword(s):  
Fluid Dynamics ◽  
Surface Tension ◽  
Lab On Chip ◽  
Micro Channels ◽  
On Chip ◽  
Long Acting ◽  
Micro Electromechanical System ◽  
Velocity Pressure ◽  
Transport Fluid ◽  
Adhesive Forces

A fluid dynamics in a micro channel for analytical chemistry and different aspects of this type of flow for specific application has remained a long-acting problem in the last two decades considering its numerus applications in various fields, thus, Surface tension and wall adhesive forces are often used to transport fluid through micro channels in Micro Electromechanical system devices or to measure the transport and position of small amounts of fluid using micropipettes. Here we took the advantages of wall adhesion and surface tension at the air/fluid interface, fluid rises through the channel and study also calculate the velocity, pressure and shape and position of the fluid surface, the model consist of a capillary channel of radius 50μm and a chamber. The study demonstrated that the fluid freely flown into the chamber 2mm/s without using any external mechanism.

scholarly journals Research on Basic Properties of Alkali-Surfactant-Polymer Flooding Produced Water and Influence of Oil-Displacing Agent on Settlement

2020 ◽  
Vol 4 (4) ◽  
pp. 1-7
Author(s):  
Zhang D
Keyword(s):  
Produced Water ◽  
Oil Droplets ◽  
Water Separation ◽  
Basic Properties ◽  
Asp Flooding ◽  
Oil Water Separation ◽  
Oil Water ◽  
The Stability ◽  
Relationship Of ◽  
Oil Droplet Size

The basic properties of alkali‒surfactant‒polymer (ASP) flooding produced water and effect of oil displacing agent on the stability of flooding produced water were obtained, through measuring and analysing water quality, oil content-settling time relationship and oil displacing agent-oil droplet size relationship of Zhong-106, Zhong-312, Zhong-417, Nan 4-8 and Bei 2-7 flooding produced water from Daqing Oilfield. The addition of ternary oil displacement agent to ASP flooding produced water greatly increases the difficulty of oil-water separation, and higher the concentration, worse the separation effect after standing. The effects of alkali, surfactant, and polymer on oil-water stability in simulated ASP flooding produced water were studied respectively. The ASP flooding produced water after 48 hours of settling formed a trace amount of nano-oil droplets, also accompanied by the accumulation and separation of a part of the oil droplets.

scholarly journals Stabilization of Pickering Emulsions by Hairy Nanoparticles Bearing Polyanions

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 816 ◽  
Author(s):  
Ying Zhang ◽  
Kaimin Chen ◽  
Lan Cao ◽  
Kai Li ◽  
Qiaoling Wang ◽  
...  
Keyword(s):  
Salt Concentration ◽  
Ultrasonic Power ◽  
Pickering Emulsions ◽  
Water Separation ◽  
Wetting Properties ◽  
Ultrasonic Time ◽  
Oil Water Separation ◽  
The Stability ◽  
Optimized Conditions

Pickering emulsions are increasingly applied in drug delivery, oil–water separation, composite materials preparation, and other fields. However, systematic studies on the stabilization of Pickering emulsions to satisfy the growing application demands in multiple fields with long-term conservation are rare. Compared to conventional solid nanoparticles, polyanion-modified hairy nanoparticles are more stable in practical environments and are investigated in this study. Poly (sodium p-styrenesulfonate) was grafted to a polystyrene (PS) core via a photoemulsion polymerization. A hairy nanoparticle bearing polyanions called poly (sodium p-styrenesulfonate) brush (PS@PSS) was synthesized. The size and uniformity of the Pickering emulsions stabilized by PS@PSS were investigated via a polarizing microscope. The stability of Pickering emulsions were optimized by adjusting critical factors like ultrasonic power and time, standing time, oil phases, salt concentration, and water:oil ratio. Results indicated that the Pickering emulsions could be stabilized by PS@PSS nanoparticles, which showed remarkable and adjustable partial wetting properties. It was found that the optimized conditions were ultrasonic power of 150 W, ultrasonic time of 3 min, salt concentration of 0.1 mM, oil phase of hexadecane, and water:oil ratio of 1:1. The formation and stability of Pickering emulsion are closely related to the hairy poly (sodium p-styrenesulfonate) brush layer on the nanoparticle surface.

scholarly journals Functional Hydrophilic Membrane for Oil–Water Separation Based on Modified Bio-Based Chitosan–Gelatin

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1176
Author(s):  
Siti Zarina Zakuwan ◽  
Ishak Ahmad ◽  
Nurfaizah Abu Tahrim ◽  
Faizal Mohamed
Keyword(s):  
Separation Efficiency ◽  
Morphological Structure ◽  
Water Mixture ◽  
Scanning Calorimetry ◽  
Water Separation ◽  
Modified Chitosan ◽  
Oil Water Separation ◽  
Oil Water ◽  
The Stability ◽  
Hydrophilic Membrane

In this study, we fabricated a modified biomaterial based on chitosan and gelatin, which is an intrinsic hydrophilic membrane for oil–water separation to clean water contamination by oil. Modification of the membrane with a non-toxic natural crosslinker, genipin, significantly enhanced the stability of the biopolymer membrane in a water-based medium towards an eco-friendly environment. The effects of various compositions of genipin-crosslinked chitosan–gelatin membrane on the rheological properties, thermal stability, and morphological structure of the membrane were investigated using a dynamic rotational rheometer, thermogravimetry analysis, and chemical composition by attenuated total reflectance spectroscopy (ATR). Modified chitosan–gelatin membrane showed completely miscible blends, as determined by field-emission scanning electron microscopy, differential scanning calorimetry, and ATR. Morphological results showed membrane with establish microstructure to further experiment as filtration product. The membranes were successfully tested for their oil–water separation efficiencies. The membrane proved to be selective and effective in separating water from an oil–water mixture. The optimum results achieved a stable microporous structure of the membrane (microfiltration) and a separation efficiency of above 98%. The membrane showed a high permeation flux, generated as high as 698 and 420 L m−2 h−1 for cooking and crude oils, respectively. Owing to its outstanding recyclability and anti-fouling performance, the membrane can be washed away easily, ensuring the reusability of the prepared membrane.

The Stability Analysis for Multivariable System Based on Lyapunov’s Function and its Application in Oil-Water Separation

2014 ◽  
Vol 926-930 ◽  
pp. 3310-3313
Author(s):  
Ai Hua Xu ◽  
Ying Zi Yuan
Keyword(s):  
Control System ◽  
Uncertain System ◽  
Separation Process ◽  
Sufficient Condition ◽  
Multivariable System ◽  
Water Separation ◽  
Oil Water Separation ◽  
Delayed System ◽  
Oil Water ◽  
The Stability

By choosing even universal Lyapunov’s function, we obtain sufficient condition of independent stability and exponential stability of delayed system . By choosing a set of suitable parameters, we can reduce the conservation of condition. As a result, this method provides a new way to ameliorate stability in robustness bounds and robustness control for uncertain system with delayed state. Analyze oil-water separation process of control system in the unite station. Obtain variation relevancy chart with oil-water separation process. Clear classify the relation among variation.

Manufacture of Online Analyzer of Water in Oil

2013 ◽  
Vol 694-697 ◽  
pp. 1267-1270
Author(s):  
Hai Jiang Liu
Keyword(s):  
Data Acquisition ◽  
High Precision ◽  
System Structure ◽  
Signal Acquisition ◽  
Interference Signal ◽  
Precision Data ◽  
Water Separation ◽  
Oil Water Separation ◽  
Separation Equipment ◽  
The Stability

Hardware and software design of high-precision real-time analyzer of water in oil that focuses on AT89C52 SCM is introduced. ICL7135A / D conversion is applied to realize high-precision data acquisition in the analog signal acquisition channels, method of true and false load is adopted to inhibit the interference signal in data acquisition department and data transmission channel, and the stability of data is improved through the operation of software. Digital tube is applied to display the measured value, an alarm signal would be sent out if the value exceeds the set value, and at the same time the control signal of the start of oil-water separation equipment would be given. The analyzer is constituted by SCM, shortwave emitter, data processing section, result display and some other components, the system structure is simple and reliable, and the measuring accuracy is high.

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