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Modulating the Selective Enrichment and Depletion of Ions Using Electrorheological Fluids in Variable-Area Microchannels.
Langmuir
January 2025
Mechanical Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur-721302, India.
Electrorheological fluids are suspensions that are characterized by a strong functional dependence of their constitutive behavior on the local electric field. While such fluids are known to be promising in different applications of microfluidics including electrokinetic flows, their capabilities of controlling ion transport and preferential solute segregation in confined fluidic systems remain to be explored. In this work, we bring out the unique role of electrorheological fluids in orchestrating the selective enrichment and depletion of charged species in variable area microfluidic channels.
View Article and Find Full Text PDFCapillary electrophoresis separations with Betaine:Urea, a deep eutectic solvent as the separation medium.
Anal Chim Acta
January 2025
School of Pharmacy, Jiangsu University, Zhenjiang, 212013, PR China. Electronic address:
Background: Capillary electrophoresis (CE) is a highly versatile separation technique widely used in analytical chemistry. Traditionally, CE can be categorized as either aqueous or non-aqueous systems based on the buffer solvents employed. For decades, non-aqueous CE has been predominantly associated with the use of organic solvents, a perception deeply ingrained in the scientific community.
View Article and Find Full Text PDFMitigating CaCO crystal nucleation and growth through continuous ion displacement via alternating electric fields.
Nat Commun
January 2025
Department of Civil & Environmental Engineering, University of California Los Angeles (UCLA), Los Angeles, CA, USA.
Article Synopsis
- Using alternating currents (AC) can effectively prevent the formation of mineral crystals on surfaces in contact with super-saturated fluids, such as heat exchangers and pipes.
- The study demonstrates that periodic charging and discharging of the electrical double layer (EDL) on titanium sheets in super-saturated CaCO solutions inhibits both crystal nucleation and growth due to enhanced ion migration.
- Operating at 4 V and frequencies between 0.1-10 Hz results in over 96% reduction in turbidity and over 92% reduction in calcium carbonate coverage, showcasing a promising method for controlling mineral scaling in various industrial applications.
Physicochemical characteristics of chitosan molecules: Modeling and experiments.
Adv Colloid Interface Sci
December 2024
Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, PL-30239 Krakow, Poland. Electronic address:
Chitosan, a biocompatible polysaccharide, finds a wide range of applications, inter alia as an antimicrobial agent, stabilizer of food products, cosmetics, and in the targeted delivery of drugs and stem cells. This work represents a comprehensive review of the properties of chitosan molecule and its aqueous solutions uniquely combining theoretical modeling and experimental results. The emphasis is on physicochemical aspects which were sparsely considered in previous reviews.
View Article and Find Full Text PDFShort Communication: Ultralow Voltage Electrokinetic Particle Trapping in DC-iEK Devices Using 9 V Alkaline Batteries as Power Supply.
Electrophoresis
November 2024
School of Engineering and Sciences, Tecnologico de Monterrey, Monterrey, Nuevo Leon, Mexico.
Article Synopsis
- The study explores the use of direct current insulator-based electrokinetic (DC-iEK) microfluidic devices powered by 9 V alkaline batteries to trap 2-µm fluorescent polystyrene particles.
- Particle trapping efficiency improved significantly with a higher voltage (18 V) compared to using a single battery, which only resulted in sporadic trapping.
- The findings suggest that lower voltages in DC-iEK systems are better suited for precise particle characterization rather than high-performance applications like separation or filtering.
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