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Keyword Author: Microfluidics

Molecularly Engineered Fluorescent Magnetic Microrobots for Sensing High-Energy Nitroaromatic Explosives in Highly Acidic Aqueous Environments

Among various analytical sensing approaches currently in use, fluorescence sensing is known for its high sensitivity, rapid response, and applicability in monitoring a wide range of target molecules. Pairing an appropriate navigation system with a fluorescent molecule that can carry it to inaccessible or hard-to-reach environments can pave the way for remote and selective sensing …

Molecularly Engineered Fluorescent Magnetic Microrobots for Sensing High-Energy Nitroaromatic Explosives in Highly Acidic Aqueous Environments Read More »

(Bio)Analytical chemistry enabled by 3D printing: Sensors and biosensors

3D printing has revolutionized the concept of object manufacturing, making an enormous impact on industry and economy. The technology has found a niche in countless fields, including scientific research. It has rendered practical solutions to scientific problems by offering tailored-shaped devices with exquisite control in design and geometry and through the versatility of printable materials. …

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Chemically Modified Graphenes as Detectors in Lab-on-Chip Device

Graphene materials hold immense potentials for electrochemical detectors in lab-on-chip devices. The electronic and electrochemical properties of graphene based materials are significantly affected by the fabrication routes and by the structural features, such as density of defects and amount of oxygen containing groups. Therefore it is paramount to evaluate various graphene-based materials prior to their …

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Graphene based nanomaterials as electrochemical detectors in Lab-on-a-chip devices

Graphene related materials have received significant attention as new and advantageous materials for electrochemistry. Here we present an evaluation of graphene oxide amperometric detectors in microfluidics devices and we compare the results to those obtained at graphite microparticles and bare glassy carbon electrodes. We evaluate the influence on peak currents (sensitivity) and peak width (resolution …

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Nanomaterials as electrochemical detectors in microfluidics and CE: Fundamentals, designs, and applications

The different approaches for constructing nanomaterial-based detectors for conventional CE and microchip electrophoresis are described in this review. They include three main types of nanomaterials, including carbon nanotubes, nanoparticles, and nanorods in various designs. The fundamental reasons for the enhanced detection performance of nanomaterial-based detectors, such as higher sensitivity, improved limits of detection, and higher …

Nanomaterials as electrochemical detectors in microfluidics and CE: Fundamentals, designs, and applications Read More »

Effects of heterogeneous electron-transfer rate on the resolution of electrophoretic separations based on microfluidics with end-column electrochemical detection

We demonstrate here that the electrode kinetics of an electrochemical detector contributes greatly to the resolution of the analyte bands in microchip electrophoresis systems with amperometric detection. The separation performance in terms of resolution and theoretical plate number can be improved and tailored by selecting or modifying the working electrode and/or by controlling the detection …

Effects of heterogeneous electron-transfer rate on the resolution of electrophoretic separations based on microfluidics with end-column electrochemical detection Read More »

Contactless conductivity detection for microfluidics: Designs and applications

Different methods for construction of contactless conductivity detectors (CCD) for microchip electrophoresis device are described in this review. This includes three main schemes of CCD for microchips, such as (i) the detection electrodes are placed along the microchannel from outside of the microchip and they are insulated from the channel by the cover lid of …

Contactless conductivity detection for microfluidics: Designs and applications Read More »

Microfluidics in amino acid analysis

Microfluidic devices have been widely used to derivatize, separate, and detect amino acids employing many different strategies. Virtually zero-dead volume interconnections and fast mass transfer in small volume microchannels enable dramatic increases in on-chip derivatization reaction speed, while only minute amounts of sample and reagent are needed. Due to short channel path, fast subsecond separations …

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Microchip flow-injection analysis of trace 2,4,6-trinitrotoluene (TNT) using mercury-amalgam electrochemical detector

This paper reports on a microfluidic device for the flow-injection/electrochemistry analysis of nitroaromatic explosive. The response is very fast (150assays/h), highly sensitive (detection limit 7.0 mu gL(-1),), reproducible and stable (R.S.D. = 2.0%; n=30) and linear (over 20-100 [mu g L-1 range). Relevant experimental parameters have been optimized. The new microsystem offers great promise for …

Microchip flow-injection analysis of trace 2,4,6-trinitrotoluene (TNT) using mercury-amalgam electrochemical detector Read More »

Analysis of nerve agents using capillary electrophoresis and laboratory-on-a-chip technology

The nerve agents belong among the most toxic compounds produced by human kind. While they have been used very sporadically until now, typically in local conflicts or by local terrorists groups, the global increase in terrorist activity in the recent years has generated tremendous demand for innovative tools capable of detecting nerve agents. Fast, sensitive …

Analysis of nerve agents using capillary electrophoresis and laboratory-on-a-chip technology Read More »

New materials for electrochemical sensing VII. Microfluidic chip platforms

This overview covers important aspects of microfluidic chip platforms as new materials for electrochemical (EC) sensing. It describes important trends in constructing detectors and their electronics on microfluidic chip platforms, the importance of selecting appropriate detector materials, and the different detection modes in on-chip amperometry, conductometry and potentiometry. We pay particular attention to the latest …

New materials for electrochemical sensing VII. Microfluidic chip platforms Read More »

Analysis of explosives via microchip electrophoresis and conventional capillary electrophoresis: A review

The upsurge in terrorist activity has generated tremendous demand for innovative tools capable of detecting major industrial, military, and home-made (improvised) explosives. Fast, sensitive, and reliable detection of explosives in the field is a very important issue in nowadays. CE, especially in its miniaturized format (lab-on-a-chip), offers great possibilities to create portable, field deployable, rapidly …

Analysis of explosives via microchip electrophoresis and conventional capillary electrophoresis: A review Read More »

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