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Sikes JC, Wonner K, Nicholson A, Cignoni P, Fritsch I, Tschulik K. Characterization of Nanoparticles in Diverse Mixtures Using Localized Surface Plasmon Resonance and Nanoparticle Tracking by Dark-Field Microscopy with Redox Magnetohydrodynamics Microfluidics. ACS PHYSICAL CHEMISTRY AU 2022; 2:289-298. [PMID: 35915589 PMCID: PMC9335947 DOI: 10.1021/acsphyschemau.1c00046] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
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Redox magnetohydrodynamics
(RMHD) microfluidics is coupled with
dark-field microscopy (DFM) to offer high-throughput single-nanoparticle
(NP) differentiation in situ and operando in a flowing mixture by localized surface plasmon resonance (LSPR)
and tracking of NPs. The color of the scattered light allows visualization
of the NPs below the diffraction limit. Their Brownian motion in 1-D
superimposed on and perpendicular to the RMHD trajectory yields their
diffusion coefficients. LSPR and diffusion coefficients provide two
orthogonal modalities for characterization where each depends on a
particle’s material composition, shape, size, and interactions
with the surrounding medium. RMHD coupled with DFM was demonstrated
on a mixture of 82 ± 9 nm silver and 140 ± 10 nm gold-coated
silica nanospheres. The two populations of NPs in the mixture were
identified by blue/green and orange/red LSPR and their scattering
intensity, respectively, and their sizes were further evaluated based
on their diffusion coefficients. RMHD microfluidics facilitates high-throughput
analysis by moving the sample solution across the wide field of view
absent of physical vibrations within the experimental cell. The well-controlled
pumping allows for a continuous, reversible, and uniform flow for
precise and simultaneous NP tracking of the Brownian motion. Additionally,
the amounts of nanomaterials required for the analysis are minimized
due to the elimination of an inlet and outlet. Several hundred individual
NPs were differentiated from each other in the mixture flowing in
forward and reverse directions. The ability to immediately reverse
the flow direction also facilitates re-analysis of the NPs, enabling
more precise sizing.
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Affiliation(s)
- Jazlynn C. Sikes
- University of Arkansas Department of Chemistry and Biochemistry, Fayetteville, Arkansas 72701, United States
| | - Kevin Wonner
- Ruhr University Bochum, Faculty of Chemistry and Biochemistry, Chair of Analytical Chemistry II, Bochum 44801, Germany
| | - Aaron Nicholson
- University of Arkansas Department of Chemistry and Biochemistry, Fayetteville, Arkansas 72701, United States
| | - Paolo Cignoni
- Ruhr University Bochum, Faculty of Chemistry and Biochemistry, Chair of Analytical Chemistry II, Bochum 44801, Germany
| | - Ingrid Fritsch
- University of Arkansas Department of Chemistry and Biochemistry, Fayetteville, Arkansas 72701, United States
| | - Kristina Tschulik
- Ruhr University Bochum, Faculty of Chemistry and Biochemistry, Chair of Analytical Chemistry II, Bochum 44801, Germany
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Miles M, Bhattacharjee B, Sridhar N, Fajrial AK, Ball K, Lee YC, Stowell MHB, Old WM, Ding X. Flattening of Diluted Species Profile via Passive Geometry in a Microfluidic Device. MICROMACHINES 2019; 10:E839. [PMID: 31801276 PMCID: PMC6952922 DOI: 10.3390/mi10120839] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 11/18/2019] [Accepted: 11/26/2019] [Indexed: 12/02/2022]
Abstract
In recent years, microfluidic devices have become an important tool for use in lab-on-a-chip processes, including drug screening and delivery, bio-chemical reactions, sample preparation and analysis, chemotaxis, and separations. In many such processes, a flat cross-sectional concentration profile with uniform flow velocity across the channel is desired to achieve controlled and precise solute transport. This is often accommodated by the use of electroosmotic flow, however, it is not an ideal for many applications, particularly biomicrofluidics. Meanwhile, pressure-driven systems generally exhibit a parabolic cross-sectional concentration profile through a channel. We draw inspiration from finite element fluid dynamics simulations to design and fabricate a practical solution to achieving a flat solute concentration profile in a two-dimensional (2D) microfluidic channel. The channel possesses geometric features to passively flatten the solute profile before entering the defined region of interest in the microfluidic channel. An obviously flat solute profile across the channel is demonstrated in both simulation and experiment. This technology readily lends itself to many microfluidic applications which require controlled solute transport in pressure driven systems.
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Affiliation(s)
- Michael Miles
- Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309-0552, USA; (M.M.); (N.S.); (A.K.F.); (Y.C.L.); (M.H.B.S.)
| | - Biddut Bhattacharjee
- Department Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO 80309-0552, USA; (B.B.); (K.B.)
| | - Nakul Sridhar
- Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309-0552, USA; (M.M.); (N.S.); (A.K.F.); (Y.C.L.); (M.H.B.S.)
| | - Apresio Kefin Fajrial
- Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309-0552, USA; (M.M.); (N.S.); (A.K.F.); (Y.C.L.); (M.H.B.S.)
| | - Kerri Ball
- Department Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO 80309-0552, USA; (B.B.); (K.B.)
| | - Yung Cheng Lee
- Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309-0552, USA; (M.M.); (N.S.); (A.K.F.); (Y.C.L.); (M.H.B.S.)
| | - Michael H. B. Stowell
- Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309-0552, USA; (M.M.); (N.S.); (A.K.F.); (Y.C.L.); (M.H.B.S.)
- Department Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO 80309-0552, USA; (B.B.); (K.B.)
| | - William M. Old
- Department Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO 80309-0552, USA; (B.B.); (K.B.)
| | - Xiaoyun Ding
- Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309-0552, USA; (M.M.); (N.S.); (A.K.F.); (Y.C.L.); (M.H.B.S.)
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Nash CK, Fritsch I. Poly(3,4-ethylenedioxythiophene)-Modified Electrodes for Microfluidics Pumping with Redox-Magnetohydrodynamics: Improving Compatibility for Broader Applications by Eliminating Addition of Redox Species to Solution. Anal Chem 2016; 88:1601-9. [DOI: 10.1021/acs.analchem.5b03182] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christena K. Nash
- Department
of Chemistry and
Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Ingrid Fritsch
- Department
of Chemistry and
Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
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Ngamchuea K, Eloul S, Tschulik K, Compton RG. Advancing from Rules of Thumb: Quantifying the Effects of Small Density Changes in Mass Transport to Electrodes. Understanding Natural Convection. Anal Chem 2015; 87:7226-34. [DOI: 10.1021/acs.analchem.5b01293] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kamonwad Ngamchuea
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Shaltiel Eloul
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Kristina Tschulik
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Richard G. Compton
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
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