1
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Alden S, Zhang L, Wang Y, Lavrik NV, Thorgaard SN, Baker LA. High-Throughput Single-Entity Electrochemistry with Microelectrode Arrays. Anal Chem 2024; 96:9177-9184. [PMID: 38780285 PMCID: PMC11154736 DOI: 10.1021/acs.analchem.4c01092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Revised: 05/09/2024] [Accepted: 05/09/2024] [Indexed: 05/25/2024]
Abstract
We describe micro- and nanoelectrode array analysis with an automated version of the array microcell method (AMCM). Characterization of hundreds of electrodes, with diameters ranging from 100 nm to 2 μm, was carried out by using AMCM voltammetry and chronoamperometry. The influence of solvent evaporation on mass transport in the AMCM pipette and the resultant electrochemical response were investigated, with experimental results supported by finite element method simulations. We also describe the application of AMCM to high-throughput single-entity electrochemistry in measurements of stochastic nanoparticle impacts. Collision experiments recorded 3270 single-particle events from 671 electrodes. Data collection parameters were optimized to enable these experiments to be completed in a few hours, and the collision transient sizes were analyzed with a U-Net deep learning model. Elucidation of collision transient sizes by histograms from these experiments was enhanced due to the large sample size possible with AMCM.
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Affiliation(s)
- Sasha
E. Alden
- Department
of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Lingjie Zhang
- Department
of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Yunong Wang
- Department
of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Nickolay V. Lavrik
- Center
for Nanophase Materials Sciences, Oak Ridge
National Laboratory, Oakridge, Tennessee 37830, United States
| | - Scott N. Thorgaard
- Department
of Chemistry, Grand Valley State University, Allendale, Michigan 49401, United States
| | - Lane A. Baker
- Department
of Chemistry, Texas A&M University, College Station, Texas 77843, United States
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2
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Saha T, Mukherjee S, Dickey MD, Velev OD. Harvesting and manipulating sweat and interstitial fluid in microfluidic devices. LAB ON A CHIP 2024; 24:1244-1265. [PMID: 38197332 DOI: 10.1039/d3lc00874f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2024]
Abstract
Microfluidic devices began to be used to facilitate sweat and interstitial fluid (ISF) sensing in the mid-2010s. Since then, numerous prototypes involving microfluidics have been developed in different form factors for sensing biomarkers found in these fluids under in vitro, ex vivo, and in vivo (on-body) settings. These devices transport and manipulate biofluids using microfluidic channels composed of silicone, polymer, paper, or fiber. Fluid flow transport and sample management can be achieved by controlling the flow rate, surface morphology of the channel, and rate of fluid evaporation. Although many devices have been developed for estimating sweat rate, electrolyte, and metabolite levels, only a handful have been able to proceed beyond laboratory testing and reach the stage of clinical trials and commercialization. To further this technology, this review reports on the utilization of microfluidics towards sweat and ISF management and transport. The review is distinguished from other recent reviews by focusing on microfluidic principles of sweat and ISF generation, transport, extraction, and management. Challenges and prospects are highlighted, with a discussion on how to transition such prototypes towards personalized healthcare monitoring systems.
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Affiliation(s)
- Tamoghna Saha
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695, USA.
| | - Sneha Mukherjee
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695, USA.
| | - Michael D Dickey
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695, USA.
| | - Orlin D Velev
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695, USA.
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3
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Lou C, Yang H, Hou Y, Huang H, Qiu J, Wang C, Sang Y, Liu H, Han L. Microfluidic Platforms for Real-Time In Situ Monitoring of Biomarkers for Cellular Processes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2307051. [PMID: 37844125 DOI: 10.1002/adma.202307051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 09/05/2023] [Indexed: 10/18/2023]
Abstract
Cellular processes are mechanisms carried out at the cellular level that are aimed at guaranteeing the stability of the organism they comprise. The investigation of cellular processes is key to understanding cell fate, understanding pathogenic mechanisms, and developing new therapeutic technologies. Microfluidic platforms are thought to be the most powerful tools among all methodologies for investigating cellular processes because they can integrate almost all types of the existing intracellular and extracellular biomarker-sensing methods and observation approaches for cell behavior, combined with precisely controlled cell culture, manipulation, stimulation, and analysis. Most importantly, microfluidic platforms can realize real-time in situ detection of secreted proteins, exosomes, and other biomarkers produced during cell physiological processes, thereby providing the possibility to draw the whole picture for a cellular process. Owing to their advantages of high throughput, low sample consumption, and precise cell control, microfluidic platforms with real-time in situ monitoring characteristics are widely being used in cell analysis, disease diagnosis, pharmaceutical research, and biological production. This review focuses on the basic concepts, recent progress, and application prospects of microfluidic platforms for real-time in situ monitoring of biomarkers in cellular processes.
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Affiliation(s)
- Chengming Lou
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China
| | - Hongru Yang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China
| | - Ying Hou
- Institute for Advanced Interdisciplinary Research (IAIR), University of Jinan, Jinan, 250022, P. R. China
| | - Haina Huang
- Institute for Advanced Interdisciplinary Research (IAIR), University of Jinan, Jinan, 250022, P. R. China
| | - Jichuan Qiu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China
| | - Chunhua Wang
- Institute for Advanced Interdisciplinary Research (IAIR), University of Jinan, Jinan, 250022, P. R. China
| | - Yuanhua Sang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China
| | - Hong Liu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China
- Institute for Advanced Interdisciplinary Research (IAIR), University of Jinan, Jinan, 250022, P. R. China
| | - Lin Han
- Institute of Marine Science and Technology, Shandong University, Qingdao, Shandong, 266000, P. R. China
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4
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Pingulkar H, Maréchal S, Salmon JB. Directional drying of a colloidal dispersion: quantitative description with water potential measurements using water clusters in a poly(dimethylsiloxane) microfluidic chip. SOFT MATTER 2024; 20:1079-1088. [PMID: 38214172 DOI: 10.1039/d3sm01512b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2024]
Abstract
We have developed a poly(dimethylsiloxane) (PDMS) microfluidic chip to study the directional drying of a colloidal dispersion confined in a channel. Our measurements on a dispersion of silica nanoparticles once again revealed the phenomenology commonly observed for such systems: the formation of a porous solid with linear growth in the channel at short times, slowing down at longer times as the evaporation rate decreases. The growth of the solid is also accompanied by mechanical stresses that are released by the delamination of the solid from the channel walls and the formation of cracks. In addition to these observations, we report original measurements using hydrophilic filler in the PDMS formulation used (Sylgard-184). When the PDMS matrix is in contact with water, water molecules pool around these hydrophilic sites, resulting in the formation of microscopic water clusters whose size depends on the water potential ψ. In our work, we have used these water clusters to estimate the water potential profile in the channel as the porous solid grows. Using a transport model that also takes into account solid delamination in the channel, we then linked these water potential measurements to the hydraulic permeability of the porous solid. These measurements finally enabled us to show that the slowdown in the evaporation rate is due to the invasion of the porous solid by air/water nanomenisci at a critical capillary pressure ψcap.
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Affiliation(s)
- Hrishikesh Pingulkar
- CNRS, Solvay, LOF, UMR 5258, Université de Bordeaux, 178 av. Schweitzer, Pessac, 33600, France.
| | - Sonia Maréchal
- CNRS, Solvay, LOF, UMR 5258, Université de Bordeaux, 178 av. Schweitzer, Pessac, 33600, France.
| | - Jean-Baptiste Salmon
- CNRS, Solvay, LOF, UMR 5258, Université de Bordeaux, 178 av. Schweitzer, Pessac, 33600, France.
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5
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Pan B, Karadaghi LR, Brutchey RL, Malmstadt N. A Multistep, Multicomponent Extraction and Separation Microfluidic Route to Recycle Water-Miscible Ionic Liquid Solvents. Ind Eng Chem Res 2024; 63:489-497. [PMID: 38223501 PMCID: PMC10785803 DOI: 10.1021/acs.iecr.3c03312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 11/16/2023] [Accepted: 12/06/2023] [Indexed: 01/16/2024]
Abstract
Recycling ionic liquid (IL) solvents can reduce the lifecycle cost of these expensive solvents. Liquid-liquid extraction is the most straightforward approach to purify IL solvents and is typically performed with an immiscible washing agent (e.g., water). Herein, we describe a recycling route for water-miscible ILs in which direct recycling is usually challenging. We use hydrophobic ILs as accommodating agents to draw the water-miscible IL from the aqueous washing stream. A biphasic slug flow of the mixed ILs and water is then separated by using a membrane. The water-miscible IL can then be drawn out from the mixed IL phase with acidified water and dried under vacuum. Both the water-miscible IL and the accommodating agent are then recycled. Here, we demonstrated a proof-of-concept of this process by recycling 1-butyl-3-methylimidazolium trifluoromethanesulfonate (BMIM-OTf) in the presence of the accommodating agent 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMIM-NTf2) and acidified water. We then demonstrated the capacity to recycle 1-butyl-1-methylpyrrolidinium triflate (BMPYRR-OTf) from a realistic synthetic application: Pt nanoparticle synthesis in the water-miscible IL.
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Affiliation(s)
- Bin Pan
- Mork
Family Department of Chemical Engineering and Materials Science, University of Southern California, 925 Bloom Walk, Los Angeles, California 90089-1211, United States
| | - Lanja R. Karadaghi
- Department
of Chemistry, University of Southern California, 840 Downey Way, Los Angeles, California 90089-0744, United States
| | - Richard L. Brutchey
- Department
of Chemistry, University of Southern California, 840 Downey Way, Los Angeles, California 90089-0744, United States
| | - Noah Malmstadt
- Mork
Family Department of Chemical Engineering and Materials Science, University of Southern California, 925 Bloom Walk, Los Angeles, California 90089-1211, United States
- Department
of Chemistry, University of Southern California, 840 Downey Way, Los Angeles, California 90089-0744, United States
- Department
of Biomedical Engineering, University of
Southern California, 1042 Downey Way, Los Angeles, California 90089-0260, United States
- USC
Norris Comprehensive Cancer Center, University
of Southern California, 1441 Eastlake Ave, Los Angeles, California 90033, United States
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6
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Eddine MA, Carvalho A, Schmutz M, Salez T, de Chateauneuf-Randon S, Bresson B, Belbekhouche S, Monteux C. Sieving and Clogging in PEG-PEGDA Hydrogel Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:15085-15094. [PMID: 37823796 DOI: 10.1021/acs.langmuir.3c02153] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/13/2023]
Abstract
Hydrogels are promising systems for separation applications due to their structural characteristics (i.e., hydrophilicity and porosity). In our study, we investigate the permeation of suspensions of rigid latex particles of different sizes through free-standing hydrogel membranes prepared by photopolymerization of a mixture of poly(ethylene glycol) diacrylate (PEGDA) and large poly(ethylene glycol) (PEG) chains of 300,000 g·mol-1 in the presence of a photoinitiator. Atomic force microscopy and cryoscanning electron microscopy (cryoSEM) were employed to characterize the structures of the hydrogel membranes. We find that the 20 nm particle permeation depends on both the PEGDA/PEG composition and the pressure applied during filtration. In contrast, we do not measure a significant permeation of the 100 nm and 1 μm particles, despite the presence of large cavities of 1 μm evidenced by the cryoSEM images. We suggest that the PEG chains induce local nanoscale defects in the cross-linking of PEGDA-rich walls separating the micrometer-sized cavities, which control the permeation of particles and water. Moreover, we discuss the decline of the permeation flux observed in the presence of latex particles compared to that of pure water. We suggest that a thin layer of particles forms on the surface of the hydrogels.
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Affiliation(s)
- Malak Alaa Eddine
- Laboratoire Sciences et Ingénierie de la Matière Molle, ESPCI Paris, 10 rue Vauquelin, 75231 Cedex 05 Paris, France
- Université Paris Est Creteil, CNRS, Institut Chimie et Matériaux Paris Est, UMR 7182, 2 Rue Henri Dunant, 94320 Thiais, France
| | - Alain Carvalho
- Université de Strasbourg, CNRS, Institut Charles Sadron, 23 rue du Loess, 67034 Cedex 02 Strasbourg, France
| | - Marc Schmutz
- Université de Strasbourg, CNRS, Institut Charles Sadron, 23 rue du Loess, 67034 Cedex 02 Strasbourg, France
| | - Thomas Salez
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33400 Talence, France
| | | | - Bruno Bresson
- Laboratoire Sciences et Ingénierie de la Matière Molle, ESPCI Paris, 10 rue Vauquelin, 75231 Cedex 05 Paris, France
| | - Sabrina Belbekhouche
- Université Paris Est Creteil, CNRS, Institut Chimie et Matériaux Paris Est, UMR 7182, 2 Rue Henri Dunant, 94320 Thiais, France
| | - Cécile Monteux
- Laboratoire Sciences et Ingénierie de la Matière Molle, ESPCI Paris, 10 rue Vauquelin, 75231 Cedex 05 Paris, France
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7
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Wang E, Laurent LC, Hall DA, Lo YH. Sample preconcentration through airjet-induced liquid phase enrichment. LAB ON A CHIP 2023; 23:4033-4043. [PMID: 37603416 DOI: 10.1039/d3lc00481c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/23/2023]
Abstract
Sample preparation is essential for nucleic acid assays, affecting their sensitivity and reliability. However, this process often results in a significant loss or dilution of the analyte, which becomes a bottleneck that limits downstream assay performance, particularly for assays that accept a limited input sample volume. To overcome this challenge, we present an evaporative-based sample enrichment method that uses an airjet to concentrate analytes within a small, defined volume by reversing the coffee-ring effect. A small, concentrated sample can then be collected for analysis to increase the initial sample load. The effectiveness of the reported airjet enrichment was quantified using qPCR of λ-DNA, HeLa-S3 RNA, and heat-inactivated SARS-CoV-2 samples. Comparisons between airjet enrichment and conventional evaporative concentration methods demonstrated significant advantages of airjet enrichment, including the ability to concentrate a high percentage of analyte within a 1 μL volume. The enrichment method was then integrated and adapted for various fluid volumes commonly found in nucleic acid sample preparation procedures. Here, airjet enrichment reduced the overall Cq by an average of 9.27 cycles for each analyte, resulting in a 600-fold enrichment from the initial concentration. To perform selective enrichment and prevent salt-based interference in downstream analysis, PEG was added to reduce the co-enrichment of salt. In addition, a preliminary study was conducted to explore the integration of airjet enrichment into ELISA using rabbit IgG as a model antigen. These findings demonstrate how airjet enrichment can be easily integrated into existing laboratory protocols with minimal modification and significantly improve the performance of biosensors.
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Affiliation(s)
- Edward Wang
- Department of Aerospace and Mechanical Engineering, Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA, USA.
| | - Louise C Laurent
- Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Diego, La Jolla, CA, USA
| | - Drew A Hall
- Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, CA, USA
| | - Yu-Hwa Lo
- Department of Aerospace and Mechanical Engineering, Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA, USA.
- Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, CA, USA
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8
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Syms RRA, Wright S. Solvent-pumped evaporation concentration on paper in linear and radial geometries. BIOMICROFLUIDICS 2023; 17:044103. [PMID: 37576441 PMCID: PMC10415022 DOI: 10.1063/5.0161199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Accepted: 07/17/2023] [Indexed: 08/15/2023]
Abstract
Solvent-pumped evaporation-driven concentration of an initial distribution of solutes on a porous substrate is considered in one and two dimensions. Approximate analytic solutions to the isotropic advection-dispersion equations are first found for a Gaussian kernel and an infinite domain, following the smoothed particle approximation. Analytic solutions for more general initial distributions are then found as sums of Gaussians, and comparison is made with numerical solutions. In each case, initial distributions are advected toward the stagnation point and concentrated. Two-dimensional analysis is then extended to describe anisotropy in permeability and diffusion, and hydrodynamic dispersion. Radial-flow experiments are performed using filter papers and water-soluble dyes. Diffusion coefficients, temperature and humidity profiles, and the evolution of spot distributions are measured. The results confirm minor anisotropy in permeability and diffusion, limited hydrodynamic dispersion, and largely uniform evaporation. Péclet numbers over 2500 are demonstrated. Evaporation-driven concentration provides a mechanism for solute transport over long timescales. Potential applications lie in the design of paper spray microanalytical devices operating by solvent pumping rather than capillary flow.
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Affiliation(s)
- Richard R. A. Syms
- EEE Department, Imperial College London, Exhibition Road, London SW7 2AZ, United Kingdom
| | - Steven Wright
- EEE Department, Imperial College London, Exhibition Road, London SW7 2AZ, United Kingdom
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9
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Cochard-Marchewka P, Bremond N, Baudry J. Droplet-based microfluidic platform for viscosity measurement over extended concentration range. LAB ON A CHIP 2023; 23:2276-2285. [PMID: 37070737 DOI: 10.1039/d3lc00073g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Rheology of concentrated protein solutions is crucial for the understanding of macromolecular crowding dynamics as well as the formulation of protein therapeutics. The cost and scarcity of most protein samples prevents wide-scale rheological studies as conventional viscosity measurement methods require large sample volume. There is a growing need for a precise and robust viscosity measurement tool that minimizes consumption and simplifies the handling of highly concentrated protein solutions. This objective is achieved by combining microfluidics and microrheology: we developed a specific microsystem to study the viscosity of aqueous solutions at high concentrations. The PDMS chip allows in situ production, storing and monitoring of water-in-oil nanoliter droplets. We perform precise viscosity measurements inside individual droplets by particle-tracking microrheology of fluorescent probes. Pervaporation of water through a PDMS membrane induces aqueous droplet shrinking, concentrating the sample up to 150 times, thus allowing viscosity measurements along an extended concentration range in just one experiment. The methodology is precisely validated by studying the viscosity of sucrose solutions. Two model proteins are also studied with sample consumption reduced to as little as 1 μL of diluted solution, showcasing the viability of our approach for the study of biopharmaceuticals.
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Affiliation(s)
- Paul Cochard-Marchewka
- Laboratoire Colloïdes et Matériaux Divisés, Institut Chimie, Biologie, Innovation, UMR 8231, ESPCI Paris, CNRS, Université Paris Sciences et Lettres, 75005 Paris, France.
| | - Nicolas Bremond
- Laboratoire Colloïdes et Matériaux Divisés, Institut Chimie, Biologie, Innovation, UMR 8231, ESPCI Paris, CNRS, Université Paris Sciences et Lettres, 75005 Paris, France.
| | - Jean Baudry
- Laboratoire Colloïdes et Matériaux Divisés, Institut Chimie, Biologie, Innovation, UMR 8231, ESPCI Paris, CNRS, Université Paris Sciences et Lettres, 75005 Paris, France.
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10
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Syms RRA, Wright S. Paper-based evaporation concentrators: Comparison of linear and radial geometries. BIOMICROFLUIDICS 2023; 17:014102. [PMID: 36619875 PMCID: PMC9815885 DOI: 10.1063/5.0129510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 12/13/2022] [Indexed: 06/17/2023]
Abstract
Paper-based evaporation concentrators with linear and radial geometries are compared. A new method of finding approximate analytic solutions of the advection-dispersion equation is proposed, based on the behavior of concentrators with infinite sources. Analytic approximations are compared with numerical solutions, and the advantage of radial concentration is highlighted: linear concentration rates scale with the square root of the Péclet number Pe while radial rates scale with Pe itself, leading to faster radial concentration beyond a critical value. Experiments are performed with Brilliant Blue FCF dye, using optical transmission and the Beer-Lambert law for quantitation. Dye concentrations are chosen for operation in the linear absorbance regime. Radial concentration is demonstrated under ambient conditions on filter paper disks with 60 mm diameter evaporation areas fed from a perimeter source, in a reverse of the well-known "coffee stain" experiment. Airflow enhanced concentration in strips and wedges is compared directly, using laser-patterned chromatography paper. The advantage of radial concentration is confirmed (and enhanced by diversion of concentrate to the corners of strips) and concentration factors greater than ∼ 500 (the dynamic range of measurement) are obtained in ∼2 h using 30 mm long columns.
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11
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Eddine MA, Belbekhouche S, de Chateauneuf-Randon S, Salez T, Kovalenko A, Bresson B, Monteux C. Large and Nonlinear Permeability Amplification with Polymeric Additives in Hydrogel Membranes. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Malak Alaa Eddine
- Laboratoire Sciences et Ingénierie de la Matière Molle, ESPCI Paris, 10 rue Vauquelin, Cedex05 75231Paris, France
- CNRS, Institut Chimie et Matériaux Paris Est, Université Paris Est Créteil, UMR 7182, 2 Rue Henri Dunant, 94320Thiais, France
| | - Sabrina Belbekhouche
- CNRS, Institut Chimie et Matériaux Paris Est, Université Paris Est Créteil, UMR 7182, 2 Rue Henri Dunant, 94320Thiais, France
| | | | - Thomas Salez
- CNRS, Univ. Bordeaux, LOMA, UMR 5798, F-33400Talence, France
| | - Artem Kovalenko
- Laboratoire Sciences et Ingénierie de la Matière Molle, ESPCI Paris, 10 rue Vauquelin, Cedex05 75231Paris, France
| | - Bruno Bresson
- Laboratoire Sciences et Ingénierie de la Matière Molle, ESPCI Paris, 10 rue Vauquelin, Cedex05 75231Paris, France
| | - Cécile Monteux
- Laboratoire Sciences et Ingénierie de la Matière Molle, ESPCI Paris, 10 rue Vauquelin, Cedex05 75231Paris, France
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12
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Yandrapalli N, Antonietti M. Dewetting-Assisted Interface Templating: Complex Emulsions to Multicavity Particles. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2203265. [PMID: 35961950 PMCID: PMC9561762 DOI: 10.1002/advs.202203265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 07/20/2022] [Indexed: 06/15/2023]
Abstract
Interfacial tension-driven formation of intricate microparticle geometries from complex emulsions is presented in this work. Emulsion-templating is a reliable platform for the generation of a diverse set of microparticles. Here, water-in-styrene-in-water complex emulsions undergo reproducible metamorphosis, i.e., from liquid state emulsions to solid structured microparticles are employed. In contrast to the traditional usage of glass-based microfluidics, polydimethylsiloxane (PDMS) swelling behavior is employed to generate complex emulsions with multiple inner cores. In the presence of block copolymer surfactant, these emulsions undergo gravity-driven dewetting of styrene, to transform into membranous structures with compartments. Further polymerization of styrene skeletal remains resulted in microparticles with interesting geometries and intact membranes. Mechanical and confocal microscopic studies prove the absence of polystyrene within these membranes. Using osmotic pressure, membrane rupture and release of encapsulated gold nanoparticles from such polymerized emulsions leading up to applications in cargo delivery and membrane transport are promoted. Even after membrane rupture, the structured microparticles have shown interesting light-scattering behavior for applications in structural coloring and biosensing. Thereby, proving PDMS-based swelling as a potential methodology for reproducible production of complex emulsions with a potential to be transformed into membranous emulsions or solid microparticles with intricate structures and multiple applications.
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Affiliation(s)
- Naresh Yandrapalli
- Max Planck Institute of Colloids and InterfacesDepartment of Colloid ChemistryAm Mühlenberg 114476PotsdamGermany
| | - Markus Antonietti
- Max Planck Institute of Colloids and InterfacesDepartment of Colloid ChemistryAm Mühlenberg 114476PotsdamGermany
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13
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Oliveira ACM, Araújo DAG, Pradela-Filho LA, Takeuchi RM, Trindade MAG, Dos Santos AL. Threads in tubing: an innovative approach towards improved electrochemical thread-based microfluidic devices. LAB ON A CHIP 2022; 22:3045-3054. [PMID: 35833547 DOI: 10.1039/d2lc00387b] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Thread-based microfluidic analytical devices have received growing attention since threads have some advantages over other materials. Compared to paper, threads are also capable of spontaneously transporting fluid due to capillary action, but they have superior mechanical strength and do not require hydrophobic barriers. Therefore, thread-based microfluidic devices can be inexpensively fabricated with no need for external pumps or sophisticated microfabrication apparatus. Despite these outstanding features, achieving a controlled and continuous flow rate is still a challenging task, mainly due to fluid evaporation. Here, we overcome this challenge by inserting a cotton thread into a polyethylene tube aiming to minimize fluid evaporation. Also, a cotton piece was inserted into the outlet reservoir to improve the wicking ability of the device. This strategy enabled the fabrication of an innovative electrochemical thread in a tubing microfluidic device that was capable to hold a consistent flow rate (0.38 μL s-1) for prolonged periods, allowing up to 100 injections in a single device by simply replacing the cotton piece in the outlet reservoir. The proposed device displayed satisfactory analytical performance for selected model analytes (dopamine, hydrogen peroxide, and tert-butylhydroquinone), in addition to being successfully used for quantification of nitrite in spiked artificial saliva samples. Beyond the flow rate improvement, this "thread-in-tube" strategy ensured the protection of the fluid from external contamination while making it easier to connect the electrode array to the microchannels. Thus, we envision that the thread in a tube strategy could bring interesting improvements to thread-based microfluidic analytical devices.
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Affiliation(s)
- Ana Clara Maia Oliveira
- Instituto de Ciências Exatas e Naturais do Pontal, Universidade Federal de Uberlândia, 38304-402, Ituiutaba, Brazil.
- Instituto de Química, Universidade Federal de Uberlândia, 38400-902, Uberlândia, Brazil
| | - Diele Aparecida Gouveia Araújo
- Instituto de Ciências Exatas e Naturais do Pontal, Universidade Federal de Uberlândia, 38304-402, Ituiutaba, Brazil.
- Instituto de Química, Universidade Federal de Uberlândia, 38400-902, Uberlândia, Brazil
| | - Lauro Antonio Pradela-Filho
- Instituto de Ciências Exatas e Naturais do Pontal, Universidade Federal de Uberlândia, 38304-402, Ituiutaba, Brazil.
- Instituto de Química, Universidade Federal de Uberlândia, 38400-902, Uberlândia, Brazil
| | - Regina Massako Takeuchi
- Instituto de Ciências Exatas e Naturais do Pontal, Universidade Federal de Uberlândia, 38304-402, Ituiutaba, Brazil.
- Instituto de Química, Universidade Federal de Uberlândia, 38400-902, Uberlândia, Brazil
| | - Magno Aparecido Gonçalves Trindade
- Faculdade de Ciências Exatas e Tecnologia, Universidade Federal da Grande Dourados, Rodovia Dourados-Itahum, km 12, 79804-970 Dourados, Mato Grosso do Sul, Brazil
| | - André Luiz Dos Santos
- Instituto de Ciências Exatas e Naturais do Pontal, Universidade Federal de Uberlândia, 38304-402, Ituiutaba, Brazil.
- Instituto de Química, Universidade Federal de Uberlândia, 38400-902, Uberlândia, Brazil
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