Thermally Mediated Double Emulsion Breakup in Bifurcating Bi-Layer Microchannel

2020 ◽  
Vol 12 (6) ◽  
Author(s):  
Yong Ren ◽  
Yue Chan ◽  
Can Yang ◽  
Jing Wang
Keyword(s):  
Interfacial Tension ◽  
Silicone Oil ◽  
Release Kinetics ◽  
Double Emulsion ◽  
Dodecanoic Acid ◽  
Emulsion Droplets ◽  
Flow Through ◽  
The Stability ◽  
Novel Applications ◽  
Kinetics Of

Abstract In this paper, we report the breakup dynamics of double emulsion droplets, as they flow through the bifurcating junction in bi-layer microchannel. Two cases have been investigated: the first involves double emulsion with core of water and shell of silicone oil with constant interfacial tension, this case shows that breakup dynamics of double emulsion can be demarcated into three regimes when the thermal effect is not dominant; whilst the second involves double emulsion with core of water and shell of dodecanoic acid where the thermocapillarity effect arises from change of interfacial tension subject to temperature variations. As demonstrated in the case, the Marangoni stress induced by the thermocapillary effect plays an important role in controlling the stability and release kinetics of double emulsion when flowing through complex microstructures. Our work will inspire novel applications, including droplet fission and actuation controlled by Marangoni flow via thermal mediation.

Dissolution kinetics of meta-torbernite under circum-neutral to alkaline conditions

2009 ◽  
Vol 6 (6) ◽  
pp. 551 ◽  
Author(s):  
Dawn M. Wellman ◽  
Bruce K. McNamara ◽  
Diana H. Bacon ◽  
Elsa A. Cordova ◽  
Ruby M. Ermi ◽  
...  
Keyword(s):  
Dissolution Kinetics ◽  
Coupled Processes ◽  
Effect Of Temperature ◽  
Subsurface Environments ◽  
Alkaline Conditions ◽  
Flow Through ◽  
Uranium Phosphate ◽  
The Stability ◽  
Kinetics Of

Environmental context. Uranium-phosphate minerals have been identified as a long-term controlling phase that limit the mobility of uranium to groundwater in many contaminated subsurface environments. Complex, coupled processes confound the ability to isolate the rates attributed to individual processes. Results of this investigation provide the necessary information to refine current prediction on the release and long-term fate of uranium in subsurface environments. Abstract. The purpose of this investigation was to conduct a series of single-pass flow-through (SPFT) tests to (1) quantify the effect of temperature (23–90°C) and pH (6–10) on meta-torbernite dissolution; (2) compare the dissolution of meta-torbernite to other autunite-group minerals; and (3) evaluate the effect of aqueous phosphate on the dissolution kinetics of meta-torbernite. Results presented here illustrate meta-torbernite dissolution rates increase by ~100× over the pH interval of 6 to 10, irrespective of temperature. The power law coefficient for meta-torbernite, η = 0.59 ± 0.07, is greater than that quantified for Ca-meta-autunite, η = 0.42 ± 0.12. This suggests the stability of meta-torbernite is greater than that of meta-autunite, which is reflected in the predicted stability constants. The rate equation for the dissolution of meta-torbernite as a function of aqueous phosphate concentration is log rdissol (mol m–2 s–1) = –4.7 × 10–13 + 4.1 × 10–10[PO43–].

The role of microsphere fabrication methods on the stability and release kinetics of ovalbumin encapsulated in polyanhydride microspheres

2006 ◽  
Vol 23 (8) ◽  
pp. 832-843 ◽  
Author(s):  
Amy S. Determan ◽  
Jennifer R. Graham ◽  
Katherine A. Pfeiffer ◽  
Balaji Narasimhan
Keyword(s):  
Release Kinetics ◽  
The Stability ◽  
Kinetics Of

Research on Influencing Factors of Heavy Oil Emulsification

2021 ◽  
Author(s):  
Yanchi Liu ◽  
Guodong Wu ◽  
Erdong Yao ◽  
Wei Zuo ◽  
Longhao Zhao ◽  
...  
Keyword(s):  
Interfacial Tension ◽  
Heavy Oil ◽  
Tight Sandstone ◽  
Emulsion Droplets ◽  
Heavy Oil Reservoirs ◽  
Alkaline Conditions ◽  
Small Tube ◽  
Oil Water ◽  
The Stability ◽  
Water Ratio

Abstract In tight heavy oil reservoirs, the formation of W/O emulsion will significantly increase the viscosity of the whole fluid-system. Meanwhile, the emulsion droplets tend to block the core pores, which will reduce the flow oil and water. In this paper, the terms of oil-water ratio, pH and other factors on heavy oil emulsification of tight sandstone in a block of Xinjiang were studied. Furthermore, in order to study the emulsification behavior in large and small pores, a large tube and a small tube are used to investigate how the hole apertures affect heavy oil emulsification. Finally, the demulsification time and dehydration rate were recorded, and the interfacial tension and viscosity were tested. The results show that heavy oil is easy to self-emulsify with water to form W/O emulsion, and it’s extremely stable. When the oil-water ratio is 3:7, the viscosity of the emulsions reaches 307 mPa·s, which is 38 times higher than that of crude oil. Acidic and alkaline conditions are benefit of demulsification and the stability of the emulsions is reduced. In small tube with higher interfacial tension, the demulsification time is shortened, and the stability of the emulsions is reduced.

Electrostatic effects control the stability and iron release kinetics of ovotransferrin

2014 ◽  
Vol 19 (6) ◽  
pp. 1009-1024 ◽  
Author(s):  
Sandeep Kumar ◽  
Deepak Sharma ◽  
Rajesh Kumar ◽  
Rajesh Kumar
Keyword(s):  
Release Kinetics ◽  
Iron Release ◽  
Electrostatic Effects ◽  
The Stability ◽  
Kinetics Of

scholarly journals Preparation, Characterization, and Release Kinetics of Chitosan-Coated Nanoliposomes Encapsulating Curcumin in Simulated Environments

Molecules ◽  
2019 ◽  
Vol 24 (10) ◽  
pp. 2023 ◽  
Author(s):  
Mahmoud Hasan ◽  
Kamil Elkhoury ◽  
Cyril J. F. Kahn ◽  
Elmira Arab-Tehrany ◽  
Michel Linder
Keyword(s):  
Release Kinetics ◽  
Physicochemical Characteristics ◽  
Biological Properties ◽  
Lipophilic Compounds ◽  
Simulated Environments ◽  
Natural Polyphenol ◽  
Poorly Soluble ◽  
The Stability ◽  
Kinetics Of ◽  
Low Solubility

Curcumin, a natural polyphenol, has many biological properties, such as anti-inflammatory, antioxidant, and anti-carcinogenic properties, yet, its sensitivity to light, oxygen, and heat, and its low solubility in water renders its preservation and bioavailability challenging. To increase its bioaccessibility, we fabricated nanoliposomes and chitosan-coated nanoliposomes encapsulating curcumin, and we evaluated the systems in terms of their physicochemical characteristics and release profiles in simulated gastrointestinal mediums. Chitosan-coating enhanced the stability of nanoliposomes and slowed the release of curcumin in the simulated gastrointestinal (GI) environment. This study demonstrates that nanoliposomes and chitosan-coated nanoliposomes are promising carriers for poorly soluble lipophilic compounds with low oral bioavailability, such as curcumin.

scholarly journals Kinetic Modeling of Flocculation and Coalescence in the System Emulsion of Water-Xylene-Terbutyl Oleyl Glycosides

2019 ◽  
Vol 14 (1) ◽  
pp. 60 ◽  
Author(s):  
Harsa Pawignya ◽  
Tutuk Djoko Kusworo ◽  
Bambang Pramudono
Keyword(s):  
Rate Constant ◽  
Kinetic Modeling ◽  
Suitable Model ◽  
Emulsion System ◽  
Flocculation Mechanism ◽  
Emulsion Droplets ◽  
Coalescence Rate ◽  
Emulsion Systems ◽  
The Stability ◽  
Kinetics Of

The development of a mathematical model for explaining the kinetics of flocculation and coalescence of emulsion droplets is essential to study the stability of an emulsion system of the kinetics of emulsion stability. Mathematic models was developed from the equation Van Den Tempel by modifying emulsion systems. The emulsion was made by mixing water-xylene and surfactant tert-butyl oleyl glycosides. This research studied the effect of stirrer speed on the value of flocculation rate constant (a) and coalescence rate constant (K). The model identified the emulsion development condition whether controlled by coalescence or flocculation. It was observed that under lower agitation speed (1000 rpm) the emulsion development was controlled by flocculation mechanism, while a faster agitation (2000 rpm or higher) exhibited coalescence controlled mechanism. The results confirmed that the 1st model was the most appropriate for water-xylene-TBOG emulsion system. From four models after fitting with experimental data, the most suitable model is 4th model, because it has the smallest error of 2.22 %. Copyright © 2019 BCREC Group. All rights reservedReceived: 2nd May 2018 ; Revised: 17th September 2018 ; Accepted: 18th September 2018; Available online: 25th January 2019; Published regularly: April 2019How to Cite: Pawignya, H., Kusworo, T.D., Pramudono, P. (2019). Kinetic Modeling of Flocculation and Coalescence in the System Emulsion of Water-Xylene-Terbutyl Oleyl Glycosides. Bulletin of Chemical Reaction Engineering & Catalysis, 14 (1): 60-68 (doi:10.9767/bcrec.14.1.2594.60-68)Permalink/DOI: https://doi.org/10.9767/bcrec.14.1.2594.60-68 

Influence of sucrose on the stability of W1/O/W2 double emulsion droplets

RSC Advances ◽  
2015 ◽  
Vol 5 (101) ◽  
pp. 83089-83095 ◽  
Author(s):  
Jie Li ◽  
Lin Su ◽  
Jing Li ◽  
Mei-Fang Liu ◽  
Su-Fen Chen ◽  
...  
Keyword(s):  
Flow Field ◽  
Wall Thickness ◽  
Double Emulsion ◽  
Rotating Flow ◽  
Emulsion Droplets ◽  
Uniform Wall ◽  
Double Emulsion Droplets ◽  
The Stability ◽  
Microencapsulation Method

Number of emulsion particles vs. time with various sucrose (Suc) concentration in rotating flow field. (Large sized W1/O/W2 double emulsion droplets with uniform wall thickness and diameters were prepared by adopting the emulsion microencapsulation method.)

scholarly journals Pectin-Based Nanomaterials: Synthesis, Toxicity and Applications

2021 ◽  
Vol 33 (11) ◽  
pp. 2579-2588
Author(s):  
Mandeep Kaur ◽  
Aditya Wadhwa ◽  
Vineet Kumar
Keyword(s):  
Drug Delivery ◽  
Human Body ◽  
Release Kinetics ◽  
Drug Carrier ◽  
Biological Origin ◽  
Nanomaterials Synthesis ◽  
The Stability ◽  
Kinetics Of

Nanomaterials of biological origin are very useful for drug delivery applications. The stability, biodegradability and biocompatibility of pectin nanomaterials in the human body make them an effective drug carrier. This review focus on different aspect of synthesis, drug encapsulation, drug release and safety of pectin-based nanomaterials. The nanomaterials can be used for the delivery of different hydrophilic and hydrophobic drugs to various organs. The release kinetics of drug loaded pectin-based nanoparticles can be studied in vitro as well as in vivo. The pectin-based nanomaterials have good pharmaco-kinetics and can ensure controlled drug delivery. However, the toxicity of pectin-based nanomaterials to human body needs to be evaluated carefully before industrial scale application.

Sign in / Sign up

Export Citation Format

Share Document