1
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Surfactant effect on mass transfer characteristics in the generation and flow stages of gas–liquid Taylor flow in a microchannel. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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2
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Wang J, Song J, Sheng L, Deng J, Luo G. Microdispersion of Gas or Water in an Anthraquinone Working Solution for the H 2O 2 Synthesis Process Intensification. Ind Eng Chem Res 2023. [DOI: 10.1021/acs.iecr.2c04503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Junjie Wang
- State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing100084, China
| | - Jing Song
- State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing100084, China
| | - Lin Sheng
- State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing100084, China
| | - Jian Deng
- State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing100084, China
| | - Guangsheng Luo
- State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing100084, China
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3
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Deng B, Schroën K, Steegmans M, de Ruiter J. Capillary pressure-based measurement of dynamic interfacial tension in a spontaneous microfluidic sensor. LAB ON A CHIP 2022; 22:3860-3868. [PMID: 36103197 DOI: 10.1039/d2lc00545j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The size of droplets and bubbles, and the properties of emulsions and foams strongly depend on dynamic interfacial tension (γd) - a parameter that is often inaccessible due to the very short time scales for droplet and bubble formation, and the inaccessibility of (e.g., food) production lines. To solve this challenge, we developed a microfluidic tensiometer that can measure γd by monitoring the formation time of both droplets and bubbles. Our tensiometer is a pressure-driven microfluidic device that operates based on the principle of a pressure balance: the formation of a droplet (or a bubble) is initialized when the Laplace pressure of the interface is decreased below the externally applied pressure, and this decrease is caused by a reduction in γd that can be calculated from the applied pressure and the Young-Laplace equation. The decay of γd due to surfactant adsorption can be followed at the characteristic time scale, which is dependent on surfactant type and concentration. For 0.05-1% wt sodium dodecyl sulfate (SDS), we were able to measure γd at time scales down to 1 ms and 0.1 ms for droplet and bubble interfaces, respectively, at increasing applied pressures and SDS concentrations. Our tensiometer proves to be a simple, robust method that inherently allows access to nearly the full range of dynamic interfacial tension at relevant time scales.
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Affiliation(s)
- Boxin Deng
- Wageningen University, Food Process Engineering Group, Bornse Weilanden 9, 6708, WG, Wageningen, The Netherlands.
| | - Karin Schroën
- Wageningen University, Food Process Engineering Group, Bornse Weilanden 9, 6708, WG, Wageningen, The Netherlands.
| | - Maartje Steegmans
- FrieslandCampina, Stationsplein 4, 3818 LE, Amersfoort, The Netherlands
| | - Jolet de Ruiter
- Wageningen University, Food Process Engineering Group, Bornse Weilanden 9, 6708, WG, Wageningen, The Netherlands.
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4
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Barmin RA, Dasgupta A, Bastard C, De Laporte L, Rütten S, Weiler M, Kiessling F, Lammers T, Pallares RM. Engineering the Acoustic Response and Drug Loading Capacity of PBCA-Based Polymeric Microbubbles with Surfactants. Mol Pharm 2022; 19:3256-3266. [PMID: 35905480 DOI: 10.1021/acs.molpharmaceut.2c00416] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Gas-filled microbubbles (MB) are routinely used in the clinic as ultrasound contrast agents. MB are also increasingly explored as drug delivery vehicles based on their ultrasound stimuli-responsiveness and well-established shell functionalization routes. Broadening the range of MB properties can enhance their performance in both imaging and drug delivery applications. This can be promoted by systematically varying the reagents used in the synthesis of MB, which in the case of polymeric MB include surfactants. We therefore set out to study the effect of key surfactant characteristics, such as the chemical structure, molecular weight, and hydrophilic-lipophilic balance on the formation of poly(butyl cyanoacrylate) (PBCA) MB, as well as on their properties, including shell thickness, drug loading capacity, ultrasound contrast, and acoustic stability. Two different surfactant families (i.e., Triton X and Tween) were employed, which show opposite molecular weight vs hydrophilic-lipophilic balance trends. For both surfactant types, we found that the shell thickness of PBCA MB increased with higher-molecular-weight surfactants and that the resulting MB with thicker shells showed higher drug loading capacities and acoustic stability. Furthermore, the higher proportion of smaller polymer chains of the Triton X-based MB (as compared to those of the Tween-based ones) resulted in lower polymer entanglement, improving drug loading capacity and ultrasound contrast response. These findings open up new avenues to fine-tune the shell properties of polymer-based MB for enhanced ultrasound imaging and drug delivery applications.
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Affiliation(s)
- Roman A Barmin
- Institute for Experimental Molecular Imaging, RWTH Aachen University Hospital, 52074 Aachen, Germany
| | - Anshuman Dasgupta
- Institute for Experimental Molecular Imaging, RWTH Aachen University Hospital, 52074 Aachen, Germany
| | - Céline Bastard
- DWI - Leibniz Institute for Interactive Materials, 52074 Aachen, Germany.,Institute for Technical and Macromolecular Chemistry, RWTH Aachen University, 52074 Aachen, Germany.,Institute of Applied Medical Engineering, Department of Advanced Materials for Biomedicine, RWTH Aachen University, 52074 Aachen, Germany
| | - Laura De Laporte
- DWI - Leibniz Institute for Interactive Materials, 52074 Aachen, Germany.,Institute for Technical and Macromolecular Chemistry, RWTH Aachen University, 52074 Aachen, Germany.,Institute of Applied Medical Engineering, Department of Advanced Materials for Biomedicine, RWTH Aachen University, 52074 Aachen, Germany
| | - Stephan Rütten
- Electron Microscope Facility, RWTH Aachen University Hospital, 52074 Aachen, Germany
| | - Marek Weiler
- Institute for Experimental Molecular Imaging, RWTH Aachen University Hospital, 52074 Aachen, Germany
| | - Fabian Kiessling
- Institute for Experimental Molecular Imaging, RWTH Aachen University Hospital, 52074 Aachen, Germany
| | - Twan Lammers
- Institute for Experimental Molecular Imaging, RWTH Aachen University Hospital, 52074 Aachen, Germany
| | - Roger M Pallares
- Institute for Experimental Molecular Imaging, RWTH Aachen University Hospital, 52074 Aachen, Germany
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5
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Khan AH, Surwase S, Jiang X, Edirisinghe M, Dalvi SV. Enhancing In Vitro Stability of Albumin Microbubbles Produced Using Microfluidic T-Junction Device. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:5052-5062. [PMID: 34264681 DOI: 10.1021/acs.langmuir.1c01516] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Microfluidics is an efficient technique for continuous synthesis of monodispersed microbubbles. However, microbubbles produced using microfluidic devices possess lower stability due to quick dissolution of core gas when exposed to an aqueous environment. This work aims at generating highly stable monodispersed albumin microbubbles using microfluidic T-junction devices. Microbubble generation was facilitated by an aqueous phase consisting of bovine serum albumin (BSA) as a model protein and nitrogen (N2) gas. Microbubbles were chemically cross-linked using dilute glutaraldehyde (0.75% v/v) solution and thermally cross-linked by collecting microbubbles in hot water maintained at 368 (±2) K. These microbubbles were then subjected to in vitro dissolution in an air-saturated water. Microbubbles cross-linked with a combined treatment of thermal and chemical cross-linking (TC & CC) had longer dissolution time compared to microbubbles chemically cross-linked (CC) alone, thermally cross-linked (TC) alone, and non-cross-linked microbubbles. Circular dichroism (CD) spectroscopy analysis revealed that percent reduction in alpha-helices of BSA was higher for the combined treatment of TC & CC when compared to other treatments. In contrast to non-cross-linked microbubbles where microbubble shell dissolved completely, a significant shell detachment was observed during the final phase of the dissolution for cross-linked microbubbles captured using high speed camera, depending upon the extent of cross-linking of the microbubble shell. SEM micrographs of the microbubble shell revealed the shell thickness of microbubbles treated with TC & CC to be highest compared to only thermally or only chemically cross-linked microbubbles. Comparison of microbubble dissolution data to a mass transfer model showed that shell resistance to gas permeation was highest for microbubbles subjected to a combined treatment of TC & CC.
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Affiliation(s)
- Aaqib H Khan
- Chemical Engineering, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar 382355, Gujarat India
| | - Swarupkumar Surwase
- Chemical Engineering, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar 382355, Gujarat India
| | - Xinyue Jiang
- Department of Mechanical Engineering, University College London (UCL), London WC1E 7JE, United Kingdom
| | - Mohan Edirisinghe
- Department of Mechanical Engineering, University College London (UCL), London WC1E 7JE, United Kingdom
| | - Sameer V Dalvi
- Chemical Engineering, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar 382355, Gujarat India
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6
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Preparation of Nanoparticle-Loaded Microbubbles via an Electrohydrodynamic Atomization Process. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12073621] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Microbubbles have been widely used in many research fields due to their outstanding physicochemical properties and unique structural characteristics, especially as ultrasonic contrast agents and drug delivery carriers. However, the stability of conventional microbubbles is generally poor, which limits the development of their applications. Loading nanoparticle to microbubbles has great potential in enhancing the stability of microbubbles. This paper reports for the first time the feasibility of one-step preparation of nanoparticle-loaded microbubbles by coaxial electrohydrodynamic atomization. Bovine serum albumin (BSA) was used as the model material of the bubble shell layer to study the effect of the loading of nanoparticles on the stability of microbubbles. The results show that the concentration of nanoparticles has a significant impact on the stability of microbubbles, and loading an appropriate amount of nanoparticles is helpful in improving the stability of microbubbles. The results also show that nanoparticle-loaded microbubbles with a size distribution in the range of 120–200 μm can be prepared under optimal conditions.
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7
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Sheng L, Chang Y, Deng J, Luo G. Taylor Bubble Generation Rules in Liquids with a Higher Viscosity in a T-Junction Microchannel. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.1c05015] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lin Sheng
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Yu Chang
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Jian Deng
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Guangsheng Luo
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
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8
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Deng B, Schroën K, de Ruiter J. Effects of dynamic adsorption on bubble formation and coalescence in partitioned-EDGE devices. J Colloid Interface Sci 2021; 602:316-324. [PMID: 34130178 DOI: 10.1016/j.jcis.2021.06.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 05/31/2021] [Accepted: 06/02/2021] [Indexed: 10/21/2022]
Abstract
HYPOTHESIS Dynamic adsorption effects can play a crucial role in bubble formation and stabilization. We hypothesize that microfluidic tools provide direct insights to these effects, and that the final bubble size depends on the intersection of time scales for bubble formation versus adsorption of proteins. EXPERIMENTS We use a microfluidic device to study Laplace pressure-driven formation of bubbles that are stabilized by whey proteins. Bubble behavior is studied as a function of the pressure difference imposed across the pores (Pd∗), and thus the bubble formation time (τ, ranging from μs to s), using highspeed recordings, quasi-static pressure arguments and a semi-empirical coalescence model. FINDINGS We observe two distinct bubble formation regimes, delimited by the pressure difference required to initiate bubble formation in pure water, Pd∗= 1400 mbar. When Pd∗<1400 mbar, protein adsorption is a requisite to lower the surface tension and initialize bubble formation. Individual bubbles (fixed d0~ 25 μm) are formed slowly with τ≫1 ms. When Pd∗ exceeds 1400 mbar, bubbles (fixed d0~ 16 μm) experience no adsorption lag and thus are formed at steeply increasing frequency, with τ < 1 ms. Interaction between these bubbles causes finite coalescence to a diameter dcoal that increases for lower τ. A minimum time of 0.4 ms is needed to immediately stabilize individual bubbles. Our study provides a promising microfluidic tool to study bubble formation and coalescence dynamics simultaneously.
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Affiliation(s)
- Boxin Deng
- Wageningen University, Food Process Engineering Group, Bornse Weilanden 9, 6708 WG Wageningen, The Netherlands
| | - Karin Schroën
- Wageningen University, Food Process Engineering Group, Bornse Weilanden 9, 6708 WG Wageningen, The Netherlands
| | - Jolet de Ruiter
- Wageningen University, Food Process Engineering Group, Bornse Weilanden 9, 6708 WG Wageningen, The Netherlands.
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9
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Lim AE, Lam YC. Vertical Squeezing Route Taylor Flow with Angled Microchannel Junctions. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c02324] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- An Eng Lim
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
| | - Yee Cheong Lam
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
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10
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Sheng L, Chen Y, Wang K, Deng J, Luo G. General rules of bubble formation in viscous liquids in a modified step T-junction microdevice. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2021.116621] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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11
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Sheng L, Chen Y, Deng J, Luo G. High‐frequency formation of bubble with short length in a capillary embedded step T‐junction microdevice. AIChE J 2021. [DOI: 10.1002/aic.17376] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Lin Sheng
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering Tsinghua University Beijing China
| | - Yuchao Chen
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering Tsinghua University Beijing China
| | - Jian Deng
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering Tsinghua University Beijing China
| | - Guangsheng Luo
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering Tsinghua University Beijing China
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12
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Chen Y, Sheng L, Deng J, Luo G. Geometric Effect on Gas–Liquid Bubbly Flow in Capillary-Embedded T-Junction Microchannels. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c00262] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuchao Chen
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Lin Sheng
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Jian Deng
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Guangsheng Luo
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
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13
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Melich R, Zorgani A, Padilla F, Charcosset C. Preparation of perfluorocarbon emulsions by premix membrane emulsification for Acoustic Droplet Vaporization (ADV) in biomedical applications. Biomed Microdevices 2020; 22:62. [DOI: 10.1007/s10544-020-00504-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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Sánchez Quintero E, Gordillo JM. Method of mass production of monodisperse microbubbles aided by intense pressure gradients. AIChE J 2020. [DOI: 10.1002/aic.16659] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Enrique Sánchez Quintero
- Área de Mecánica de Fluidos, Departamento de Ingenería Aeroespacial y Mecánica de Fluidos Universidad de Sevilla Sevilla Spain
| | - Jose M. Gordillo
- Área de Mecánica de Fluidos, Departamento de Ingenería Aeroespacial y Mecánica de Fluidos Universidad de Sevilla Sevilla Spain
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15
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Sohrabi S, Kassir N, Keshavarz Moraveji M. Droplet microfluidics: fundamentals and its advanced applications. RSC Adv 2020; 10:27560-27574. [PMID: 35516933 PMCID: PMC9055587 DOI: 10.1039/d0ra04566g] [Citation(s) in RCA: 85] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Revised: 09/03/2020] [Accepted: 07/09/2020] [Indexed: 01/09/2023] Open
Abstract
Droplet-based microfluidic systems have been shown to be compatible with many chemical and biological reagents and capable of performing a variety of operations that can be rendered programmable and reconfigurable. This platform has dimensional scaling benefits that have enabled controlled and rapid mixing of fluids in the droplet reactors, resulting in decreased reaction times. This, coupled with the precise generation and repeatability of droplet operations, has made the droplet-based microfluidic system a potent high throughput platform for biomedical research and applications. In addition to being used as micro-reactors ranging from the nano- to femtoliter (10-15 liters) range; droplet-based systems have also been used to directly synthesize particles and encapsulate many biological entities for biomedicine and biotechnology applications. For this, in the following article we will focus on the various droplet operations, as well as the numerous applications of the system and its future in many advanced scientific fields. Due to advantages of droplet-based systems, this technology has the potential to offer solutions to today's biomedical engineering challenges for advanced diagnostics and therapeutics.
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Affiliation(s)
- Somayeh Sohrabi
- Department of Chemical Engineering, Amirkabir University of Technology, Tehran Polytechnic Iran
| | - Nour Kassir
- Department of Chemical Engineering, Amirkabir University of Technology, Tehran Polytechnic Iran
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16
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Kumar P, Pathak M. Pressure Transient during Wettability-Mediated Droplet Formation in a Microfluidic T-Junction. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c01504] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Piyush Kumar
- Sustainable Energy Research Laboratory, Mechanical Engineering Department, Indian Institute of Technology, Patna, Bihar 801103, India
| | - Manabendra Pathak
- Sustainable Energy Research Laboratory, Mechanical Engineering Department, Indian Institute of Technology, Patna, Bihar 801103, India
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17
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Deng B, de Ruiter J, Schroën K. Application of Microfluidics in the Production and Analysis of Food Foams. Foods 2019; 8:E476. [PMID: 31614474 PMCID: PMC6835574 DOI: 10.3390/foods8100476] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 10/07/2019] [Accepted: 10/09/2019] [Indexed: 12/13/2022] Open
Abstract
Emulsifiers play a key role in the stabilization of foam bubbles. In food foams, biopolymers such as proteins are contributing to long-term stability through several effects such as increasing bulk viscosity and the formation of viscoelastic interfaces. Recent studies have identified promising new stabilizers for (food) foams and emulsions, for instance biological particles derived from water-soluble or water-insoluble proteins, (modified) starch as well as chitin. Microfluidic platforms could provide a valuable tool to study foam formation on the single-bubble level, yielding mechanistic insights into the formation and stabilization (as well as destabilization) of foams stabilized by these new stabilizers. Yet, the recent developments in microfluidic technology have mainly focused on emulsions rather than foams. Microfluidic devices have been up-scaled (to some extent) for large-scale emulsion production, and also designed as investigative tools to monitor interfaces at the (sub)millisecond time scale. In this review, we summarize the current state of the art in droplet microfluidics (and, where available, bubble microfluidics), and provide a perspective on the applications for (food) foams. Microfluidic investigations into foam formation and stability are expected to aid in optimization of stabilizer selection and production conditions for food foams, as well as provide a platform for (large-scale) production of monodisperse foams.
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Affiliation(s)
- Boxin Deng
- Food Process Engineering Group, Wageningen University, Bornse Weilanden 9, 6708 WG Wageningen, The Netherlands.
| | - Jolet de Ruiter
- Food Process Engineering Group, Wageningen University, Bornse Weilanden 9, 6708 WG Wageningen, The Netherlands.
| | - Karin Schroën
- Food Process Engineering Group, Wageningen University, Bornse Weilanden 9, 6708 WG Wageningen, The Netherlands.
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18
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Chen Z, Pulsipher KW, Chattaraj R, Hammer DA, Sehgal CM, Lee D. Engineering the Echogenic Properties of Microfluidic Microbubbles Using Mixtures of Recombinant Protein and Amphiphilic Copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:10079-10086. [PMID: 30768278 PMCID: PMC6698903 DOI: 10.1021/acs.langmuir.8b03882] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Microbubbles are used as ultrasound contrast agents in medical diagnosis and also have shown great promise in ultrasound-mediated therapy. However, short lifetime and broad size distribution of microbubbles limit their applications in therapy and imaging. Moreover, it is challenging to tailor the echogenic response of microbubbles to make them suitable for specific applications. To overcome these challenges, we use microfluidic flow-focusing to prepare monodisperse microbubbles with a mixture of a recombinant amphiphilic protein, oleosin, and a synthetic amphiphilic copolymer, Pluronic. We show that these microbubbles have superior uniformity and stability under ultrasonic stimulation compared to commercial agents. We also demonstrate that by using different Pluronics, the echogenic response of the microbubbles can be tailored. Our work shows the versatility of using the combination of microfluidics and protein/copolymer mixtures as a method of engineering microbubbles. This tunability could potentially be important and powerful in producing microbubble agents for theranostic applications.
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Affiliation(s)
- Zhuo Chen
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Katherine W. Pulsipher
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Rajarshi Chattaraj
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Department of Radiology, University of Pennsylvania Medical Center, Philadelphia, Pennsylvania 19104, United States
| | - Daniel A. Hammer
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Chandra M. Sehgal
- Department of Radiology, University of Pennsylvania Medical Center, Philadelphia, Pennsylvania 19104, United States
| | - Daeyeon Lee
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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19
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Aramide B, Kothandaraman A, Edirisinghe M, Jayasinghe SN, Ventikos Y. General Computational Methodology for Modeling Electrohydrodynamic Flows: Prediction and Optimization Capability for the Generation of Bubbles and Fibers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:10203-10212. [PMID: 30892903 DOI: 10.1021/acs.langmuir.8b03763] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The application of an electric field on a fluid in motion gives rise to unique features and flow manipulation capabilities. Technologies ranging from bubble formation, droplet generation, fiber spinning, and many others are predicated on this type of flows, often referred to as Electrohydrodynamics (EHD). In this paper, we present a numerical methodology that allows for the modeling of such processes in a generalized way. The method can account for the premixing of various liquid species, the injection of gases in the mixture and the interaction of such complex multiphase flow with an electric field, static or AC. The domain in which these processes take place can be of arbitrary geometric complexity, allowing for design and optimization of complex EHD devices. Our study looks at the critical phases of some of these processes and emphasizes the strong coupling of fluid mechanics and electric fields and the influence of the electric field on fluid flow and vice versa. The conservation of mass and momentum, with appropriate additional force terms coming from the presence of the electric field, and the electrostatic equations are coupled together and solved using the Finite Volume method. The Volume of Fluid (VoF) technique is used to track free surfaces dynamically. The solution procedure iteratively computes electric body and surface forces and then includes those into the Navier-Stokes equation to predict the velocity field and other fluid parameters. No initial shape is assumed for the fluid(s) and charge distributions. The methodology presented handles two-dimensional, axisymmetric. and full three-dimensional cases of arbitrary geometric complexity, allowing for mixing and microfluidic configurations of high levels of realism. We highlight the capability of the method by demonstrating cases like the formation of a Taylor cone, microfluidic bubble generation, jet evolution, and droplet breakup. Results agree well with both existing experimental and computational reports.
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Affiliation(s)
- Babatunde Aramide
- Department of Mechanical Engineering , University College London , London , WC1E 7JE , United Kingdom
| | - Anjana Kothandaraman
- Department of Mechanical Engineering , University College London , London , WC1E 7JE , United Kingdom
| | - Mohan Edirisinghe
- Department of Mechanical Engineering , University College London , London , WC1E 7JE , United Kingdom
| | - Suwan N Jayasinghe
- Department of Mechanical Engineering , University College London , London , WC1E 7JE , United Kingdom
| | - Yiannis Ventikos
- Department of Mechanical Engineering , University College London , London , WC1E 7JE , United Kingdom
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20
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Fatemi N, Devos C, Cordt G, Gerven T, Kuhn S. Effect of Sodium Dodecyl Sulfate on the Continuous Crystallization in Microfluidic Devices Using Microbubbles. Chem Eng Technol 2019. [DOI: 10.1002/ceat.201900172] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Naghmeh Fatemi
- KU LeuvenDepartment of Chemical Engineering Celestijnenlaan 200F 3001 Leuven Belgium
| | - Cedric Devos
- KU LeuvenDepartment of Chemical Engineering Celestijnenlaan 200F 3001 Leuven Belgium
| | - Glenn Cordt
- KU LeuvenDepartment of Chemical Engineering Celestijnenlaan 200F 3001 Leuven Belgium
| | - Tom Gerven
- KU LeuvenDepartment of Chemical Engineering Celestijnenlaan 200F 3001 Leuven Belgium
| | - Simon Kuhn
- KU LeuvenDepartment of Chemical Engineering Celestijnenlaan 200F 3001 Leuven Belgium
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21
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Lim AE, Lim CY, Lam YC, Lim YH. Effect of microchannel junction angle on two-phase liquid-gas Taylor flow. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2019.03.044] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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22
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Mi S, Weldetsadik NT, Hayat Z, Fu T, Zhu C, Jiang S, Ma Y. Effects of the Gas Feed on Bubble Formation in a Microfluidic T-Junction: Constant-Pressure versus Constant-Flow-Rate Injection. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b01262] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sheng Mi
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Netsanet Tesfaye Weldetsadik
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Zafar Hayat
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Taotao Fu
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Chunying Zhu
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Shaokun Jiang
- The 718th Research Institute of China Shipbuilding Industry Corporation, No. 17 Zhanlan Road, Handan City, Hebei Province 056027, China
| | - Youguang Ma
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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23
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Melich R, Valour JP, Urbaniak S, Padilla F, Charcosset C. Preparation and characterization of perfluorocarbon microbubbles using Shirasu Porous Glass (SPG) membranes. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2018.09.058] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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24
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Wu L, Han Y, Zhang Q, Zhu L, Zhang C, Zhao R. Molecular Dynamics Simulation: Influence of External Electric Field on Bubble Interface in Air Flotation Process. Chem Res Chin Univ 2018. [DOI: 10.1007/s40242-018-8195-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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25
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Salari A, Gnyawali V, Griffiths IM, Karshafian R, Kolios MC, Tsai SSH. Shrinking microbubbles with microfluidics: mathematical modelling to control microbubble sizes. SOFT MATTER 2017; 13:8796-8806. [PMID: 29135012 DOI: 10.1039/c7sm01418j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Microbubbles have applications in industry and life-sciences. In medicine, small encapsulated bubbles (<10 μm) are desirable because of their utility in drug/oxygen delivery, sonoporation, and ultrasound diagnostics. While there are various techniques for generating microbubbles, microfluidic methods are distinguished due to their precise control and ease-of-fabrication. Nevertheless, sub-10 μm diameter bubble generation using microfluidics remains challenging, and typically requires expensive equipment and cumbersome setups. Recently, our group reported a microfluidic platform that shrinks microbubbles to sub-10 μm diameters. The microfluidic platform utilizes a simple microbubble-generating flow-focusing geometry, integrated with a vacuum shrinkage system, to achieve microbubble sizes that are desirable in medicine, and pave the way to eventual clinical uptake of microfluidically generated microbubbles. A theoretical framework is now needed to relate the size of the microbubbles produced and the system's input parameters. In this manuscript, we characterize microbubbles made with various lipid concentrations flowing in solutions that have different interfacial tensions, and monitor the changes in bubble size along the microfluidic channel under various vacuum pressures. We use the physics governing the shrinkage mechanism to develop a mathematical model that predicts the resulting bubble sizes and elucidates the dominant parameters controlling bubble sizes. The model shows a good agreement with the experimental data, predicting the resulting microbubble sizes under different experimental input conditions. We anticipate that the model will find utility in enabling users of the microfluidic platform to engineer bubbles of specific sizes.
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Affiliation(s)
- A Salari
- Biomedical Engineering Graduate Program, Ryerson University, Toronto, Canada
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26
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Shi S, Wang Y, Bai S, Ding M, Chen W. Migration-plugging properties and plugging mechanism of microfoam. J DISPER SCI TECHNOL 2017. [DOI: 10.1080/01932691.2016.1272057] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Shenglong Shi
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, China
| | - Yefei Wang
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, China
| | - Shixun Bai
- College of Engineering and Applied Science, University of Wyoming, Laramie, Wyoming, USA
| | - Mingchen Ding
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, China
| | - Wuhua Chen
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, China
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27
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Zhang C, Fu T, Zhu C, Jiang S, Ma Y, Li HZ. Dynamics of bubble formation in highly viscous liquids in a flow-focusing device. Chem Eng Sci 2017. [DOI: 10.1016/j.ces.2017.06.026] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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28
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Hernandez-Alvarado F, Kalaga DV, Turney D, Banerjee S, Joshi JB, Kawaji M. Void fraction, bubble size and interfacial area measurements in co-current downflow bubble column reactor with microbubble dispersion. Chem Eng Sci 2017. [DOI: 10.1016/j.ces.2017.05.006] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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29
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Shi S, Wang Y, Bai S, Li Z, Ding M, Chen W. Pore-Scale Studies on the Stability of Microfoam and the Effect of Parameters on Its Bubble Size. J DISPER SCI TECHNOL 2016. [DOI: 10.1080/01932691.2015.1058168] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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30
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Lin H, Chen J, Chen C. A novel technology: microfluidic devices for microbubble ultrasound contrast agent generation. Med Biol Eng Comput 2016; 54:1317-30. [DOI: 10.1007/s11517-016-1475-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2015] [Accepted: 02/15/2016] [Indexed: 12/16/2022]
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31
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Muijlwijk K, Berton-Carabin C, Schroën K. Cross-flow microfluidic emulsification from a food perspective. Trends Food Sci Technol 2016. [DOI: 10.1016/j.tifs.2016.01.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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32
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33
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Zhang WH, Zhang J, Zhao B, Zhu P. Microbubble Size Distribution Measurement in a DAF System. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b00109] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Wen-Hui Zhang
- Tianjin Key Laboratory of Pulp & Paper, College of Material Science & Chemical Engineering, Tianjin University of Science &Technology, Tianjin 300457, China
| | - Jinzhao Zhang
- Tianjin Key Laboratory of Pulp & Paper, College of Material Science & Chemical Engineering, Tianjin University of Science &Technology, Tianjin 300457, China
| | - Bo Zhao
- Tianjin Key Laboratory of Pulp & Paper, College of Material Science & Chemical Engineering, Tianjin University of Science &Technology, Tianjin 300457, China
| | - Penghui Zhu
- Tianjin Key Laboratory of Pulp & Paper, College of Material Science & Chemical Engineering, Tianjin University of Science &Technology, Tianjin 300457, China
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34
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Peng H, Xu Z, Chen S, Zhang Z, Li B, Ge L. An easily assembled double T-shape microfluidic devices for the preparation of submillimeter-sized polyacronitrile (PAN) microbubbles and polystyrene (PS) double emulsions. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2014.12.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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35
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Parhizkar M, Edirisinghe M, Stride E. The effect of surfactant type and concentration on the size and stability of microbubbles produced in a capillary embedded T-junction device. RSC Adv 2015. [DOI: 10.1039/c4ra15167d] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This work presents the effect of various surfactants on microbubble formation, size and stability in a capillary embedded T-Junction microfluidic device.
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Affiliation(s)
- M. Parhizkar
- Department of Mechanical Engineering
- University College London
- London
- UK
| | - M. Edirisinghe
- Department of Mechanical Engineering
- University College London
- London
- UK
| | - E. Stride
- Department of Mechanical Engineering
- University College London
- London
- UK
- Institute of Biomedical Engineering
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36
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37
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Shams MM, Dong M, Mahinpey N. Viscosity and rheological behavior of microbubbles in capillary tubes. AIChE J 2014. [DOI: 10.1002/aic.14434] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Mohammad Mehdi Shams
- Schulich School of Engineering; Dept. of Chemical and Petroleum Engineering; University of Calgary; Calgary Alberta Canada T2N 1N4
| | - Mingzhe Dong
- Schulich School of Engineering; Dept. of Chemical and Petroleum Engineering; University of Calgary; Calgary Alberta Canada T2N 1N4
- College of Petroleum Engineering; China University of Petroleum (Huadong); Qingdao, Shandong China
| | - Nader Mahinpey
- Schulich School of Engineering; Dept. of Chemical and Petroleum Engineering; University of Calgary; Calgary Alberta Canada T2N 1N4
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38
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Wang WT, Chen R, Xu JH, Wang YD, Luo GS. One-step microfluidic approach for controllable production of gas-in-water-in-oil (G/W/O) double emulsions and hollow hydrogel microspheres. RSC Adv 2014. [DOI: 10.1039/c4ra01526f] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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39
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Chen J, Wang S, Ke H, Cai S, Zhao Y. Gas–liquid two-phase flow splitting at microchannel junctions with different branch angles. Chem Eng Sci 2013. [DOI: 10.1016/j.ces.2013.10.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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40
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Yang L, Wang K, Mak S, Li Y, Luo G. A novel microfluidic technology for the preparation of gas-in-oil-in-water emulsions. LAB ON A CHIP 2013; 13:3355-3359. [PMID: 23824066 DOI: 10.1039/c3lc50652e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
This paper presents a novel microfluidic method for the controllable generation of uniform gas-in-oil-in-water double emulsions with ultra-thin liquid films (2-12 μm) covering microbubbles (116-180 μm). This method combines one dispersion stage and a mass transfer-induced phase separation process in a simple co-flowing microchannel, instead of a complicated microfluidic device fabrication and a multistage dispersion process. In our experiments, CO2-alkane gas mixtures (dispersed phase) and NaOH aqueous solutions (continuous phase) were utilized as working systems. The main factors affecting the diameter of the inner bubble and the volume of the oil film are discussed. Through our method, the monodispersed gas-in-oil-in-water emulsions can be prepared in a simple and precise way.
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Affiliation(s)
- Lu Yang
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing, China
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41
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Herrada MA, Gañán-Calvo AM, Montanero JM. Theoretical investigation of a technique to produce microbubbles by a microfluidic T junction. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:033027. [PMID: 24125364 DOI: 10.1103/physreve.88.033027] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Indexed: 05/25/2023]
Abstract
A microfluidic technique is proposed to produce microbubbles. A gaseous stream is injected through a T junction into a channel transporting a liquid current. The gas adheres to a hydrophobic strip printed on the channel surface. When the gas and liquid flow rates are set appropriately, a gaseous rivulet flows over that strip. The rivulet breaks up downstream due to a capillary pearling instability, which leads to a monodisperse collection of microbubbles that can be much smaller than the channel size. The physics of the process is theoretically investigated, using both full numerical simulation of the Navier-Stokes equations and a linear stability analysis of an infinite gaseous rivulet driven by a coflowing liquid stream. This stability analysis allows one to determine a necessary condition to get this effect in a T junction device. It also provides reasonably good predictions for the size of the produced microbubbles as obtained from numerical experiments.
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Affiliation(s)
- M A Herrada
- Escuela Superior de Ingenieros, Universidad de Sevilla, Camino de los Descubrimientos s/n, E-41092 Sevilla, Spain
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43
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Phillips LC, Puett C, Sheeran PS, Wilson Miller G, Matsunaga TO, Dayton PA. Phase-shift perfluorocarbon agents enhance high intensity focused ultrasound thermal delivery with reduced near-field heating. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2013; 134:1473-82. [PMID: 23927187 PMCID: PMC3745500 DOI: 10.1121/1.4812866] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2012] [Revised: 01/04/2013] [Accepted: 01/08/2013] [Indexed: 05/19/2023]
Abstract
Ultrasound contrast agents are known to enhance high intensity focused ultrasound (HIFU) ablation, but these perfluorocarbon microbubbles are limited to the vasculature, have a short half-life in vivo, and may result in unintended heating away from the target site. Herein, a nano-sized (100-300 nm), dual perfluorocarbon (decafluorobutane/dodecafluoropentane) droplet that is stable, is sufficiently small to extravasate, and is convertible to micron-sized bubbles upon acoustic activation was investigated. Microbubbles and nanodroplets were incorporated into tissue-mimicking acrylamide-albumin phantoms. Microbubbles or nanodroplets at 0.1 × 10(6) per cm(3) resulted in mean lesion volumes of 80.4 ± 33.1 mm(3) and 52.8 ± 14.2 mm(3) (mean ± s.e.), respectively, after 20 s of continuous 1 MHz HIFU at a peak negative pressure of 4 MPa, compared to a lesion volume of 1.0 ± 0.8 mm(3) in agent-free control phantoms. Magnetic resonance thermometry mapping during HIFU confirmed undesired surface heating in phantoms containing microbubbles, whereas heating occurred at the acoustic focus of phantoms containing the nanodroplets. Maximal change in temperature at the target site was enhanced by 16.9% and 37.0% by microbubbles and nanodroplets, respectively. This perfluorocarbon nanodroplet has the potential to reduce the time to ablate tumors by one-third during focused ultrasound surgery while also safely enhancing thermal deposition at the target site.
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Affiliation(s)
- Linsey C Phillips
- Department of Biomedical Engineering, University of North Carolina at Chapel Hill, 109 Mason Farm Road, 304 Taylor Hall, CB 7575, Chapel Hill, North Carolina 27599, USA.
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44
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Casey J, Sennoga C, Mulvana H, Hajnal JV, Tang MX, Eckersley RJ. Single bubble acoustic characterization and stability measurement of adherent microbubbles. ULTRASOUND IN MEDICINE & BIOLOGY 2013; 39:903-914. [PMID: 23473537 DOI: 10.1016/j.ultrasmedbio.2012.12.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Revised: 12/10/2012] [Accepted: 12/11/2012] [Indexed: 06/01/2023]
Abstract
This article examines how the acoustic and stability characteristics of single lipid-shelled microbubbles (MBs) change as a result of adherence to a target surface. For individual adherent and non-adherent MBs, the backscattered echo from a narrowband 2-MHz, 90-kPa peak negative pressure interrogation pulse was obtained. These measurements were made in conjunction with an increasing amplitude broadband disruption pulse. It was found that, for the given driving frequency, adherence had little effect on the fundamental response of an MB. Examination of the second harmonic response indicated an increase of the resonance frequency for an adherent MB: resonance radius increasing of 0.3 ± 0.1 μm for an adherent MB. MB stability was seen to be closely related to MB resonance and gave further evidence of a change in the resonance frequency due to adherence.
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Affiliation(s)
- Jonathan Casey
- Imaging Sciences Department, Imperial College, London, UK
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45
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Abstract
Droplet-based microfluidics or digital microfluidics is a subclass of microfluidic devices, wherein droplets are generated using active or passive methods. The active method for generation of droplets involves the use of an external factor such as an electric field for droplet generation. Two techniques that fall in this category are dielectrophoresis (DEP) and electrowetting on dielectric (EWOD). In passive methods, the droplet generation depends on the geometry and dimensions of the device. T-junction and flow focusing methods are examples of passive methods used for generation of droplets. In this chapter the methods used for droplet generation, mixing of contents of droplets, and the manipulation of droplets are described in brief. A review of the applications of digital microfluidics with emphasis on the last decade is presented.
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Affiliation(s)
- Sanjiv Sharma
- Institute of Biomedical Engineering & Department of Chemistry, Imperial College, London, UK.
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46
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Zhao Y, Chen G, Ye C, Yuan Q. Gas–liquid two-phase flow in microchannel at elevated pressure. Chem Eng Sci 2013. [DOI: 10.1016/j.ces.2012.10.011] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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47
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Hashmi A, Yu G, Reilly-Collette M, Heiman G, Xu J. Oscillating bubbles: a versatile tool for lab on a chip applications. LAB ON A CHIP 2012; 12:4216-27. [PMID: 22864283 DOI: 10.1039/c2lc40424a] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
With the fast development of acoustic and multiphase microfluidics in recent years, oscillating bubbles have drawn more-and-more attention due to their great potential in various Lab on a Chip (LOC) applications. Many innovative bubble-based devices have been explored in the past decade. In this article, we first briefly summarize current understanding of the physics of oscillating bubbles, and then critically summarize recent advancements, including some of our original work, on the applications of oscillating bubbles in microfluidic devices. We intend to highlight the advantages of using oscillating bubbles along with the challenges that accompany them. We believe that these emerging studies on microfluidic oscillating bubbles will be revolutionary to the development of next-generation LOC technologies.
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Affiliation(s)
- Ali Hashmi
- Mechanical Engineering, Washington State University, Vancouver, USA
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48
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Chen R, Dong PF, Xu JH, Wang YD, Luo GS. Controllable microfluidic production of gas-in-oil-in-water emulsions for hollow microspheres with thin polymer shells. LAB ON A CHIP 2012; 12:3858-3860. [PMID: 22733304 DOI: 10.1039/c2lc40387k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Here we developed a simple and novel one-step approach to produce G/O/W emulsions with high gas volume fractions in a capillary microfluidic device. The thickness of the oil layer can be controlled easily by tuning the flow rates. We successfully used the G/O/W emulsions to prepared hollow microspheres with thin polymer shells.
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Affiliation(s)
- Ran Chen
- The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
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49
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Ben Abdelwahed MA, Wielhorski Y, Bizet L, Bréard J. Characterisation of bubbles formed in a cylindrical T-shaped junction device. Chem Eng Sci 2012. [DOI: 10.1016/j.ces.2012.04.025] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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50
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Wang K, Lu Y, Yang L, Luo G. Microdroplet coalescences at microchannel junctions with different collision angles. AIChE J 2012. [DOI: 10.1002/aic.13825] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Kai Wang
- Dept. of Chemical Engineering; The State Key Laboratory of Chemical Engineering; Tsinghua University; Beijing; 100084; People's Republic of China
| | - Yangcheng Lu
- Dept. of Chemical Engineering; The State Key Laboratory of Chemical Engineering; Tsinghua University; Beijing; 100084; People's Republic of China
| | - Lu Yang
- Dept. of Chemical Engineering; The State Key Laboratory of Chemical Engineering; Tsinghua University; Beijing; 100084; People's Republic of China
| | - Guangsheng Luo
- Dept. of Chemical Engineering; The State Key Laboratory of Chemical Engineering; Tsinghua University; Beijing; 100084; People's Republic of China
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