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Bu Y, Wang J, Ni S, Lu Z, Guo Y, Yobas L. High-Performance Gel-Free and Label-Free Size Fractionation of Extracellular Vesicles with Two-Dimensional Electrophoresis in a Microfluidic Artificial Sieve. Anal Chem 2024; 96:3508-3516. [PMID: 38364051 DOI: 10.1021/acs.analchem.3c05290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2024]
Abstract
Extracellular vesicles (EVs) are cell-derived particles that exhibit diverse sizes, molecular contents, and clinical implications for various diseases depending on their specific subpopulations. However, fractionation of EV subpopulations with high resolution, efficiency, purity, and yield remains an elusive goal due to their diminutive sizes. In this study, we introduce a novel strategy that effectively separates EV subpopulations in a gel-free and label-free manner, using two-dimensional (2D) electrophoresis in a microfluidic artificial sieve. The microfabricated artificial sieve consists of periodically arranged micro-slit-well structures in a 2D array and generates an anisotropic electric field pattern to size fractionate EVs into discrete streams and steer the subpopulations into designated outlets for collection within a minute. Along with fractionating EV subpopulations, contaminants such as free proteins and short nucleic acids can be simultaneously directed to waste outlets, thus accomplishing both size fractionation and purification of EVs with high performance. Our platform offers a simple, rapid, and versatile solution for EV subpopulation isolation, which can potentially facilitate the discovery of biomarkers for specific EV subtypes and the development of EV-based therapeutics.
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Affiliation(s)
- Yang Bu
- Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR 999077, P. R. China
| | - Jinhui Wang
- Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR 999077, P. R. China
| | - Sheng Ni
- Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR 999077, P. R. China
| | - Zechen Lu
- Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR 999077, P. R. China
| | - Yusong Guo
- Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR 999077, P. R. China
| | - Levent Yobas
- Department of Electronic and Computer Engineering, Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR 999077, P. R. China
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Chai Z, Childress A, Busnaina AA. Directed Assembly of Nanomaterials for Making Nanoscale Devices and Structures: Mechanisms and Applications. ACS NANO 2022; 16:17641-17686. [PMID: 36269234 PMCID: PMC9706815 DOI: 10.1021/acsnano.2c07910] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Accepted: 10/06/2022] [Indexed: 05/19/2023]
Abstract
Nanofabrication has been utilized to manufacture one-, two-, and three-dimensional functional nanostructures for applications such as electronics, sensors, and photonic devices. Although conventional silicon-based nanofabrication (top-down approach) has developed into a technique with extremely high precision and integration density, nanofabrication based on directed assembly (bottom-up approach) is attracting more interest recently owing to its low cost and the advantages of additive manufacturing. Directed assembly is a process that utilizes external fields to directly interact with nanoelements (nanoparticles, 2D nanomaterials, nanotubes, nanowires, etc.) and drive the nanoelements to site-selectively assemble in patterned areas on substrates to form functional structures. Directed assembly processes can be divided into four different categories depending on the external fields: electric field-directed assembly, fluidic flow-directed assembly, magnetic field-directed assembly, and optical field-directed assembly. In this review, we summarize recent progress utilizing these four processes and address how these directed assembly processes harness the external fields, the underlying mechanism of how the external fields interact with the nanoelements, and the advantages and drawbacks of utilizing each method. Finally, we discuss applications made using directed assembly and provide a perspective on the future developments and challenges.
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Affiliation(s)
- Zhimin Chai
- State
Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing100084, China
- NSF
Nanoscale Science and Engineering Center for High-Rate Nanomanufacturing
(CHN), Northeastern University, Boston, Massachusetts02115, United States
| | - Anthony Childress
- NSF
Nanoscale Science and Engineering Center for High-Rate Nanomanufacturing
(CHN), Northeastern University, Boston, Massachusetts02115, United States
| | - Ahmed A. Busnaina
- NSF
Nanoscale Science and Engineering Center for High-Rate Nanomanufacturing
(CHN), Northeastern University, Boston, Massachusetts02115, United States
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4
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Shabaniverki S, Juárez JJ. Directed Assembly of Particles for Additive Manufacturing of Particle-Polymer Composites. MICROMACHINES 2021; 12:935. [PMID: 34442557 PMCID: PMC8401964 DOI: 10.3390/mi12080935] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 08/03/2021] [Accepted: 08/03/2021] [Indexed: 11/17/2022]
Abstract
Particle-polymer dispersions are ubiquitous in additive manufacturing (AM), where they are used as inks to create composite materials with applications to wearable sensors, energy storage materials, and actuation elements. It has been observed that directional alignment of the particle phase in the polymer dispersion can imbue the resulting composite material with enhanced mechanical, electrical, thermal or optical properties. Thus, external field-driven particle alignment during the AM process is one approach to tailoring the properties of composites for end-use applications. This review article provides an overview of externally directed field mechanisms (e.g., electric, magnetic, and acoustic) that are used for particle alignment. Illustrative examples from the AM literature show how these mechanisms are used to create structured composites with unique properties that can only be achieved through alignment. This article closes with a discussion of how particle distribution (i.e., microstructure) affects mechanical properties. A fundamental description of particle phase transport in polymers could lead to the development of AM process control for particle-polymer composite fabrication. This would ultimately create opportunities to explore the fundamental impact that alignment has on particle-polymer composite properties, which opens up the possibility of tailoring these materials for specific applications.
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Affiliation(s)
- Soheila Shabaniverki
- Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA;
| | - Jaime J. Juárez
- Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA;
- Center for Multiphase Flow Research and Education, Iowa State University, Ames, IA 50011, USA
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5
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Ramesh V, Rehbock C, Giera B, Karnes JJ, Forien JB, Angelov SD, Schwabe K, Krauss JK, Barcikowski S. Comparing Direct and Pulsed-Direct Current Electrophoretic Deposition on Neural Electrodes: Deposition Mechanism and Functional Influence. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:9724-9734. [PMID: 34357777 DOI: 10.1021/acs.langmuir.1c01081] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Electrophoretic deposition (EPD) of platinum nanoparticles (PtNPs) on platinum-iridium (Pt-Ir) neural electrode surfaces is a promising strategy to tune the impedance of electrodes implanted for deep brain stimulation in various neurological disorders such as advanced Parkinson's disease and dystonia. However, previous results are contradicting as impedance reduction was observed on flat samples while in three-dimensional (3D) structures, an increase in impedance was observed. Hence, defined correlations between coating properties and impedance are to date not fully understood. In this work, the influence of direct current (DC) and pulsed-DC electric fields on NP deposition is systematically compared and clear correlations between surface coating homogeneity and in vitro impedance are established. The ligand-free NPs were synthesized via pulsed laser processing in liquid, yielding monomodal particle size distributions, verified by analytical disk centrifugation (ADC). Deposits formed were quantified by UV-vis supernatant analysis and further characterized by scanning electron microscopy (SEM) with semiautomated interparticle distance analyses. Our findings reveal that pulsed-DC electric fields yield more ordered surface coatings with a lower abundance of particle assemblates, while DC fields produce coatings with more pronounced aggregation. Impedance measurements further highlight that impedance of the corresponding electrodes is significantly reduced in the case of more ordered coatings realized by pulsed-DC depositions. We attribute this phenomenon to the higher active surface area of the adsorbed NPs in homogeneous coatings and the reduced particle-electrode electrical contact in NP assemblates. These results provide insight for the efficient EPD of bare metal NPs on micron-sized surfaces for biomedical applications in neuroscience and correlate coating homogeneity with in vitro functionality.
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Affiliation(s)
- Vaijayanthi Ramesh
- Technical Chemistry I, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
| | - Christoph Rehbock
- Technical Chemistry I, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
| | - Brian Giera
- Center for Engineered Materials and Manufacturing, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - John J Karnes
- Center for Engineered Materials and Manufacturing, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Jean-Baptiste Forien
- Center for Engineered Materials and Manufacturing, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Svilen D Angelov
- Department of Neurosurgery, Hannover Medical School, 30625 Hannover, Germany
| | - Kerstin Schwabe
- Department of Neurosurgery, Hannover Medical School, 30625 Hannover, Germany
| | - Joachim K Krauss
- Department of Neurosurgery, Hannover Medical School, 30625 Hannover, Germany
| | - Stephan Barcikowski
- Technical Chemistry I, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
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Khan FSA, Mubarak NM, Tan YH, Khalid M, Karri RR, Walvekar R, Abdullah EC, Nizamuddin S, Mazari SA. A comprehensive review on magnetic carbon nanotubes and carbon nanotube-based buckypaper for removal of heavy metals and dyes. JOURNAL OF HAZARDOUS MATERIALS 2021; 413:125375. [PMID: 33930951 DOI: 10.1016/j.jhazmat.2021.125375] [Citation(s) in RCA: 94] [Impact Index Per Article: 31.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 02/01/2021] [Accepted: 02/06/2021] [Indexed: 06/12/2023]
Abstract
Industrial effluents contain several organic and inorganic contaminants. Among others, dyes and heavy metals introduce a serious threat to drinking waterbodies. These pollutants can be noxious or carcinogenic in nature, and harmful to humans and different aquatic species. Therefore, it is of high importance to remove heavy metals and dyes to reduce their environmental toxicity. This has led to an extensive research for the development of novel materials and techniques for the removal of heavy metals and dyes. One route to the removal of these pollutants is the utilization of magnetic carbon nanotubes (CNT) as adsorbents. Magnetic carbon nanotubes hold remarkable properties such as surface-volume ratio, higher surface area, convenient separation methods, etc. The suitable characteristics of magnetic carbon nanotubes have led them to an extensive search for their utilization in water purification. Along with magnetic carbon nanotubes, the buckypaper (BP) membranes are also favorable due to their unique strength, high porosity, and adsorption capability. However, BP membranes are mostly used for salt removal from the aqueous phase and limited literature shows their applications for removal of heavy metals and dyes. This study focuses on the existence of heavy metal ions and dyes in the aquatic environment, and methods for their removal. Various fabrication approaches for the development of magnetic-CNTs and CNT-based BP membranes are also discussed. With the remarkable separation performance and ultra-high-water flux, magnetic-CNTs, and CNT-based BP membranes have a great potential to be the leading technologies for water treatment in future.
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Affiliation(s)
- Fahad Saleem Ahmed Khan
- Department of Chemical Engineering, Faculty of Engineering and Science, Curtin University, 98009 Miri, Sarawak, Malaysia
| | - Nabisab Mujawar Mubarak
- Department of Chemical Engineering, Faculty of Engineering and Science, Curtin University, 98009 Miri, Sarawak, Malaysia.
| | - Yie Hua Tan
- Department of Chemical Engineering, Faculty of Engineering and Science, Curtin University, 98009 Miri, Sarawak, Malaysia
| | - Mohammad Khalid
- Graphene & Advanced 2D Materials Research Group (GAMRG), School of Science and Technology, Sunway University, No. 5, Jalan University, Bandar Sunway, 47500 Petaling Jaya, Selangor, Malaysia
| | - Rama Rao Karri
- Petroleum, and Chemical Engineering, Faculty of Engineering, Universiti Teknologi Brunei, Brunei Darussalam
| | - Rashmi Walvekar
- Department of Chemical Engineering, School of Energy and Chemical Engineering, Xiamen University Malaysia, Jalan Sunsuria, Bandar Sunsuria, 43900 Sepang, Selangor, Malaysia
| | - Ezzat Chan Abdullah
- Department of Chemical Process Engineering, Malaysia-Japan International Institute of Technology (MJIIT) Universiti Teknologi Malaysia (UTM), Jalan Sultan Yahya Petra, 54100 Kuala Lumpur, Malaysia
| | | | - Shaukat Ali Mazari
- Department of Chemical Engineering, Dawood University of Engineering and Technology, Karachi 74800, Pakistan
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Sherief HH, Faltas MS, Ragab KE. Transient electrophoresis of a conducting spherical particle embedded in an electrolyte-saturated Brinkman medium. Electrophoresis 2021; 42:1636-1647. [PMID: 34118079 DOI: 10.1002/elps.202100063] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 05/09/2021] [Accepted: 06/03/2021] [Indexed: 11/11/2022]
Abstract
In this study, the time-dependent electrophoretic motion of a conducting spherical particle embedded in an arbitrary electrolyte solution saturated porous medium is investigated. The porous medium is uniformly charged and the embedded hard particle is charged with constant ζ -potential or constant surface charge density. The unsteady modified Brinkman equation with an electric force term, which governs the fluid velocity field, is used to model the porous medium and is solved by Laplace's transform technique. An analytical expression for the electrophoretic velocity of the spherical particle is obtained in Laplace transform domain as a function of the relevant parameters, and its inversion is obtained through numerical techniques. Also, in this study, the steady-state electrophoretic velocity is obtained analytically as linear functions of ζ -potential (or surface density charge) and the fixed charge density. The steady-state electrophoretic velocity is displayed graphically for various relevant parameters and compered with the available data in the literature. Also, the numerical values of the transient electrophoretic velocity are plotted versus the nondimensional elapsed time and discussed for different values of the Debye length parameter, density ratio, permeability of the porous medium, and for high and nonconducting particles.
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Affiliation(s)
- H H Sherief
- Faculty of Science, Department of Mathematics and Computer Science, Alexandria University, Alexandria, 21568, Egypt
| | - M S Faltas
- Faculty of Science, Department of Mathematics and Computer Science, Alexandria University, Alexandria, 21568, Egypt
| | - Kareem E Ragab
- Faculty of Science, Department of Mathematics and Computer Science, Alexandria University, Alexandria, 21568, Egypt
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8
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Saji VS. Electrophoretic-deposited Superhydrophobic Coatings. Chem Asian J 2021; 16:474-491. [PMID: 33465276 DOI: 10.1002/asia.202001425] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 01/17/2021] [Indexed: 02/04/2023]
Abstract
Electrophoretic deposition (EPD) is an excellent surface coating approach widely investigated for applications ranging from solar cells, batteries, electrochemical capacitors, solid oxide fuel cells, sensors, molecular sieves, corrosion-resistant coatings, and biomedical materials. On the other hand, superhydrophobic (SHPC) surfaces have enticed substantial recent research interest owing to their superb surface properties. Here, we provide a comprehensive review of electrophoretic-deposited SHPC coatings. Concise descriptions of EPD and superhydrophobicity are provided first, followed by a brief mentioning of works reported on electrophoretic-deposited SHPC coatings by one-step or two-step processing (§2.1). The next section (§2.2) delivers a comprehensive description of these reports based on the micro/nanoparticles used. Works reported in specific applications such as anti-corrosion, biomedical, and oil-separation are described in §2.3. Future scopes of research also presented.
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Affiliation(s)
- Viswanathan S Saji
- Center of Research Excellence in Corrosion, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran, 31261, Saudi Arabia
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9
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Lai YC, Keh HJ. Transient electrophoresis in a suspension of charged particles with arbitrary electric double layers. Electrophoresis 2021; 42:2126-2133. [PMID: 33433000 DOI: 10.1002/elps.202000336] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 12/16/2020] [Accepted: 01/04/2021] [Indexed: 11/07/2022]
Abstract
The startup of electrophoretic motion in a suspension of spherical colloidal particles, which may be charged with constant zeta potential or constant surface charge density, due to the sudden application of an electric field is analytically examined. The unsteady modified Stokes equation governing the fluid velocity field is solved with unit cell models. Explicit formulas for the transient electrophoretic velocity of the particle in a cell in the Laplace transforms are obtained as functions of relevant parameters. The transient electrophoretic mobility is a monotonic decreasing function of the particle-to-fluid density ratio and in general a decreasing function of the particle volume fraction, but it increases and decreases with a raise in the ratio of the particle radius to the Debye length for the particles with constant zeta potential and constant surface charge density, respectively. On the other hand, the relaxation time in the growth of the electrophoretic mobility increases substantially with an increase in the particle-to-fluid density ratio and with a decrease in the particle volume fraction but is not a sensitive function of the ratio of the particle radius to the Debye length. For specified values of the particle volume fraction and particle-to-fluid density ratio in a suspension, the relaxation times in the growth of the particle mobility in transient electrophoresis and transient sedimentation are equivalent.
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Affiliation(s)
- Yi C Lai
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
| | - Huan J Keh
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
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Li MX, Keh HJ. Start-Up Electrophoresis of a Cylindrical Particle with Arbitrary Double Layer Thickness. J Phys Chem B 2020; 124:9967-9973. [PMID: 33085892 DOI: 10.1021/acs.jpcb.0c07436] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The start-up of electrophoretic motion of a charged circular cylindrical particle in an unbounded solution of arbitrary electrolytes is analytically investigated. The modified Stokes equation for the transient fluid flow field is solved by using the Laplace transform. Analytical formulas for the time-evolving electrophoretic velocities of the dielectric cylinder are determined for the transversely and axially imposed electric fields, and they can be superimposed linearly for an imposed electric field of arbitrary direction. The transient electrophoretic velocities normalized by their respective steady-state values increase monotonically with an increase in the ratio of the particle radius to the Debye screening length but decrease monotonically with an increase in the particle-to-fluid density ratio, keeping the other parameter unchanged. The normalized electrophoretic acceleration of the particle decreases monotonically with the elapsed time. In general, the electrophoretic velocity of the cylindrical particle is not collinear with the arbitrarily oriented imposed electric field. The effect of the relaxation time for the transient electrophoresis is much more important for a cylindrical particle than for a spherical particle.
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Affiliation(s)
- Meng X Li
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Huan J Keh
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
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11
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Lai YC, Keh HJ. Transient electrophoresis of a charged porous particle. Electrophoresis 2020; 41:259-265. [DOI: 10.1002/elps.201900413] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 11/29/2019] [Accepted: 12/23/2019] [Indexed: 11/05/2022]
Affiliation(s)
- Yi C. Lai
- Department of Chemical EngineeringNational Taiwan University Taipei Taiwan
| | - Huan J. Keh
- Department of Chemical EngineeringNational Taiwan University Taipei Taiwan
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Kalinina EG, Pikalova EY. New trends in the development of electrophoretic deposition method in the solid oxide fuel cell technology: theoretical approaches, experimental solutions and development prospects. RUSSIAN CHEMICAL REVIEWS 2019. [DOI: 10.1070/rcr4889] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The key features and challenges of the use of electrophoretic deposition for the formation of functional layers of solid oxide fuel cells are considered. Theoretical models and experimental results of the studies of electrophoretic deposition are presented. The analysis covers the physicochemical deposition mechanisms, methods for preparing suspensions and conditions necessary for obtaining thin-film electrode and protective single- and multi-layers with both dense and porous structure for solid oxide fuel cells. The prospects of theoretical simulations of the method and its potential practical applications are evaluated.
The bibliography includes 282 references.
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Lo YJ, Lei U. Measurement of the real part of the Clausius-Mossotti factor of dielectrophoresis for Brownian particles. Electrophoresis 2019; 41:137-147. [PMID: 31661554 DOI: 10.1002/elps.201900345] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Revised: 10/20/2019] [Accepted: 10/24/2019] [Indexed: 11/09/2022]
Abstract
A method is proposed for measuring the real part of the Clausius-Mossotti factor ( K r ) of dielectrophoresis for Brownian particles based on a solution of the Smoluchowski equation using a designed polydimethysilloxane microchannel with planar hyperbolic electrodes on its glass substrate. An approximate two-dimensional spring-like dielectrophoretic force is generated in the device, and the data necessarily measured is the time evolution of the in-plane particle displacement undergoing confined Brownian motion. Validity of the measurement was checked against the zeta potentials in the literature based on the classical theory of surface conductance using polystyrene particles of size of one micron. As the dielectrophoretic force depends on K r , which is usually unknown for bio-particles and some engineered particles, and is seldom measured; this study is important from the academic point of view and could be helpful for the manipulation and characterization of sub-micron particles using dielectrophoresis. Extension of the method to the measurement of permanent dipole moment and total polarizability of particle was developed theoretically and discussed by incorporating an optical tweezer into the present device.
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Affiliation(s)
- Ying-Jie Lo
- Institute of Applied Mechanics, National Taiwan University, Taipei, 10617, Taiwan, Republic of China
| | - U Lei
- Institute of Applied Mechanics, National Taiwan University, Taipei, 10617, Taiwan, Republic of China
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14
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Barrett DJ, Linley MD, Best SM, Cameron RE. Fabrication of free standing collagen membranes by pulsed-electrophoretic deposition. Biofabrication 2019; 11:045017. [DOI: 10.1088/1758-5090/ab331d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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15
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Heise S, Forster C, Heer S, Qi H, Zhou J, Virtanen S, Lu T, Boccaccini AR. Electrophoretic deposition of gelatine nanoparticle/chitosan coatings. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.03.145] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Pritchet D, Moser N, Ehmann K, Cao J, Huang J. Quantifying Discretization Errors in Electrophoretically-Guided Micro Additive Manufacturing. MICROMACHINES 2018; 9:E447. [PMID: 30424380 PMCID: PMC6187608 DOI: 10.3390/mi9090447] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 08/31/2018] [Accepted: 09/04/2018] [Indexed: 11/16/2022]
Abstract
This paper presents process models for a new micro additive manufacturing process termed Electrophoretically-guided Micro Additive Manufacturing (EPμAM). In EPμAM, a planar microelectrode array generates the electric potential distributions which cause colloidal particles to agglomerate and deposit in desired regions. The discrete microelectrode array nature and the used pulse width modulation (PWM) technique for microelectrode actuation create unavoidable process errors-space and time discretization errors-that distort particle trajectories. To combat this, we developed finite element method (FEM) models to study trajectory deviations due to these errors. Mean square displacement (MSD) analysis of the computed particle trajectories is used to compare these deviations for several electrode geometries. The two top-performing electrode geometries evaluated by MSD were additionally investigated through separate case studies via geometry variation and MSD recomputation. Furthermore, separate time-discretization error simulations are also studied where electrode actuating waveforms were simulated. The mechanical impulse of the electromechanical force, generated from these waveforms is used as the basis for comparison. The obtained results show a moderate MSDs variability and significant differences in the computed mechanical impulses for the actuating waveforms. The observed limitations of the developed process model and of the error comparison technique are briefly discussed and future steps are recommended.
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Affiliation(s)
- David Pritchet
- Mechanical Engineering Department, Northwestern University, Evanston, IL 60208, USA.
| | - Newell Moser
- Mechanical Engineering Department, Northwestern University, Evanston, IL 60208, USA.
| | - Kornel Ehmann
- Mechanical Engineering Department, Northwestern University, Evanston, IL 60208, USA.
| | - Jian Cao
- Mechanical Engineering Department, Northwestern University, Evanston, IL 60208, USA.
| | - Jiaxing Huang
- Materials Science and Engineering Department, Northwestern University, Evanston, IL 60208, USA.
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Bakhshandeh S, Amin Yavari S. Electrophoretic deposition: a versatile tool against biomaterial associated infections. J Mater Chem B 2018; 6:1128-1148. [PMID: 32254176 DOI: 10.1039/c7tb02445b] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Biomaterial-associated infections (BAIs) are today considered as one of the most withering complications of orthopedic implant surgery. Even though BAIs occur relatively infrequently in primary joint replacement surgeries (incidence rates around 1-2%), revision arthroplasties carry up to 40% risk of infection recurrence, with devastating consequences for the patient and significant associated cost. Once the responsible pathogens, mainly bacteria, attach to the surface of the biomaterial, they start creating layers of extracellular matrix with complex architectures, called biofilms. These last mentioned, encapsulate and protect bacteria by hindering the immune response and impeding antibiotics from reaching the pathogens. To prevent such an outcome, the surface of the biomaterials, in particular implants, can be modified in order to play the role of inherent drug delivery devices or as substrates for antibacterial/multifunctional coating deposition. This paper presents an overview of novel electrochemically-triggered deposition strategies, with a focus on electrophoretic deposition (EPD), a versatile and cost-effective technique for organic and inorganic material deposition. Other than being a simple deposition tool, EPD has been recently employed to create novel micro/nanostructured surfaces for multi-purpose antibacterial approaches, presented in detail in this review. In addition, a thorough comparison and assessment of the latest antibacterial and multifunctional compounds deposited by means of EPD have been reported, followed by a critical reflection on current and future prospects of the topic. The relative simplicity of EPD's application, has, by some means, undermined the fundamental requirement of rationality of multifunctional coating design. The demanding practical needs for a successful clinical translation in the growing fields of tissue engineering and antibacterial/multifunctional implant coatings, calls for a more systematic in vitro experimental design rationale, in order to make amends for the scarcity of significant in vivo and clinical studies.
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Affiliation(s)
- Sadra Bakhshandeh
- Department of Orthopedics, University Medical Centre Utrecht, Utrecht, The Netherlands.
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18
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Chen R, Cai X, Ma K, Zhou Y, Wang Y, Jiang T. The fabrication of double-layered chitosan/gelatin/genipin nanosphere coating for sequential and controlled release of therapeutic proteins. Biofabrication 2017; 9:025028. [DOI: 10.1088/1758-5090/aa70c3] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Höhn S, Braem A, Neirinck B, Virtanen S. Albumin coatings by alternating current electrophoretic deposition for improving corrosion resistance and bioactivity of titanium implants. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 73:798-807. [DOI: 10.1016/j.msec.2016.12.129] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 11/16/2016] [Accepted: 12/21/2016] [Indexed: 11/30/2022]
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20
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Electrophoretic deposition and characterization of chitosan/bioactive glass composite coatings on Mg alloy substrates. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.02.081] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Braem A, De Brucker K, Delattin N, Killian MS, Roeffaers MBJ, Yoshioka T, Hayakawa S, Schmuki P, Cammue BPA, Virtanen S, Thevissen K, Neirinck B. Alternating Current Electrophoretic Deposition for the Immobilization of Antimicrobial Agents on Titanium Implant Surfaces. ACS APPLIED MATERIALS & INTERFACES 2017; 9:8533-8546. [PMID: 28211996 DOI: 10.1021/acsami.6b16433] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
One prominent cause of implant failure is infection; therefore, research is focusing on developing surface coatings that render the surface resistant to colonization by micro-organisms. Permanently attached coatings of antimicrobial molecules are of particular interest because of the reduced cytoxicity and lower risk of developing resistance compared to controlled release coatings. In this study, we focus on the chemical grafting of bioactive molecules on titanium. To concentrate the molecules at the metallic implant surface, we propose electrophoretic deposition (EPD) applying alternating current (AC) signals with an asymmetrical wave shape. We show that for the model molecule bovine serum albumin (BSA), as well as for the clinically relevant antifungal lipopeptide caspofungin (CASP), the deposition yield is drastically improved by superimposing a DC offset in the direction of the high-amplitude peak of the AC signal. Additionally, in order to produce immobilized CASP coatings, this experimental AC/DC-EPD method is combined with an established surface activation protocol. Principle component analysis (PCA) of time-of-flight secondary ion mass spectrometry (ToF-SIMS) data confirm the immobilization of CASP with higher yield as compared to a diffusion-controlled process, and higher purity than the clinical CASP starting suspensions. Scratch testing data indicate good coating adhesion. Importantly, the coatings remain active against the fungal pathogen C. albicans as shown by in vitro biofilm experiments. In summary, this paper delivers a proof-of-concept for the application of AC-EPD as a fast grafting tool for antimicrobial molecules without compromising their activities.
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Affiliation(s)
- Annabel Braem
- KU Leuven Department of Materials Engineering (MTM), Kasteelpark Arenberg 44, 3001 Heverlee, Belgium
| | - Katrijn De Brucker
- KU Leuven Centre of Microbial and Plant Genetics (CMPG), Kasteelpark Arenberg 20, 3001 Heverlee, Belgium
| | - Nicolas Delattin
- KU Leuven Centre of Microbial and Plant Genetics (CMPG), Kasteelpark Arenberg 20, 3001 Heverlee, Belgium
| | - Manuela S Killian
- Department of Materials Science and Engineering, Chair for Surface Science and Corrosion, Friedrich-Alexander-University of Erlangen-Nuremberg , Martensstrasse 7, 91058 Erlangen, Germany
| | - Maarten B J Roeffaers
- KU Leuven Center for Surface Chemistry and Catalysis (COK), Kasteelpark Arenberg 23, 3001 Leuven, Belgium
| | - Tomohiko Yoshioka
- Biomaterials Laboratory, Graduate School of Natural Science and Technology, Okayama University , 3-1-1, Tsushima, Kita-ku, Okayama 700-8530, Japan
| | - Satoshi Hayakawa
- Biomaterials Laboratory, Graduate School of Natural Science and Technology, Okayama University , 3-1-1, Tsushima, Kita-ku, Okayama 700-8530, Japan
| | - Patrik Schmuki
- Department of Materials Science and Engineering, Chair for Surface Science and Corrosion, Friedrich-Alexander-University of Erlangen-Nuremberg , Martensstrasse 7, 91058 Erlangen, Germany
| | - Bruno P A Cammue
- KU Leuven Centre of Microbial and Plant Genetics (CMPG), Kasteelpark Arenberg 20, 3001 Heverlee, Belgium
- Department of Plant Systems Biology, Vlaams Instituut voor Biotechnologie (VIB) , Technologiepark 927, 9052 Ghent, Belgium
| | - Sannakaisa Virtanen
- Department of Materials Science and Engineering, Chair for Surface Science and Corrosion, Friedrich-Alexander-University of Erlangen-Nuremberg , Martensstrasse 7, 91058 Erlangen, Germany
| | - Karin Thevissen
- KU Leuven Centre of Microbial and Plant Genetics (CMPG), Kasteelpark Arenberg 20, 3001 Heverlee, Belgium
| | - Bram Neirinck
- KU Leuven Department of Materials Engineering (MTM), Kasteelpark Arenberg 44, 3001 Heverlee, Belgium
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22
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Biscombe CJC. Die Entdeckung der elektrokinetischen Phänomene: Was ist wirklich geschehen? Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201608536] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Christian J. C. Biscombe
- Department of Chemical and Biomolecular Engineering; The University of Melbourne; Parkville VIC 3010 Australien
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Biscombe CJC. The Discovery of Electrokinetic Phenomena: Setting the Record Straight. Angew Chem Int Ed Engl 2016; 56:8338-8340. [DOI: 10.1002/anie.201608536] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 10/11/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Christian J. C. Biscombe
- Department of Chemical and Biomolecular Engineering; The University of Melbourne; Parkville VIC 3010 Australia
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Wang X, Zhou L, Lu L, Lobo FL, Li N, Wang H, Park J, Ren ZJ. Alternating Current Influences Anaerobic Electroactive Biofilm Activity. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:9169-9176. [PMID: 27485403 DOI: 10.1021/acs.est.6b00813] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Alternating current (AC) is known to inactivate microbial growth in suspension, but how AC influences anaerobic biofilm activities has not been systematically investigated. Using a Geobacter dominated anaerobic biofilm growing on the electrodes of microbial electrochemical reactors, we found that high frequency AC ranging from 1 MHz to 1 kHz (amplitude of 5 V, 30 min) showed only temporary inhibition to the biofilm activity. However, lower frequency (100 Hz, 1.2 or 5 V) treatment led to 47 ± 19% permanent decrease in limiting current on the same biofilm, which is attributed to the action of electrohydrodynamic force that caused biofilm damage and loss of intercellular electron transfer network. Confocal microscopy images show such inactivation mainly occurred at the interface between the biofilm and the electrode. Reducing the frequency further to 1 Hz led to water electrolysis, which generated gas bubbles that flushed all attached cells out of the electrode. These findings provide new references on understanding and regulating biofilm growth, which has broader implications in biofouling control, anaerobic waste treatment, energy and product recovery, and general understanding of microbial ecology and physiology.
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Affiliation(s)
- Xin Wang
- MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, Nankai University , No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China
| | - Lean Zhou
- MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, Nankai University , No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China
| | - Lu Lu
- Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder , Boulder, Colorado 80309, United States
| | - Fernanda Leite Lobo
- Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder , Boulder, Colorado 80309, United States
| | - Nan Li
- Tianjin Key Lab of Indoor Air Environmental Quality Control, School of Environmental Science and Engineering, Tianjin University , No. 92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Heming Wang
- Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder , Boulder, Colorado 80309, United States
| | - Jaedo Park
- Department of Electrical Engineering, University of Colorado Denver , Denver, Colorado 80204, United States
| | - Zhiyong Jason Ren
- Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder , Boulder, Colorado 80309, United States
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25
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Liu J, Wu Z, Li T, Zhou D, Zhang K, Sheng Y, Cui J, Zhang H, Yang B. Electrophoretic deposition of fluorescent Cu and Au sheets for light-emitting diodes. NANOSCALE 2016; 8:395-402. [PMID: 26616393 DOI: 10.1039/c5nr06599b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Electrophoretic deposition (EPD) is a conventional method for fabricating film materials from nanometer-sized building blocks, and exhibits the advantages of low-cost, high-efficiency, wide-range thickness adjustment, and uniform deposition. Inspired by the interest in the application of two-dimensional (2D) nanomaterials, the EPD technique has been recently extended to building blocks with 2D features. However, the studies are mainly focused on simplex building blocks. The utilization of multiplex building blocks is rarely reported. In this work, we demonstrate a controlled EPD of Cu and Au sheets, which are 2D assemblies of luminescent Cu and Au nanoclusters. Systematic investigations reveal that both the deposition efficiency and the thickness are determined by the lateral size of the sheets. For Cu sheets with a large lateral size, a high ζ-potential and strong face-to-face van der Waals interactions facilitate the deposition with high efficiency. However, for Au sheets, the small lateral size and ζ-potential limit the formation of a thick film. To solve this problem, the deposition dynamics are controlled by increasing the concentration of the Au sheets and adding acetone. This understanding permits the fabrication of a binary EPD film by the stepwise deposition of Cu and Au sheets, thus producing a luminescent film with both Cu green emission and Au red emission. A white light-emitting diode prototype with color coordinates (x, y) = (0.31, 0.36) is fabricated by employing the EPD film as a color conversion layer on a 365 nm GaN clip and further tuning the amount of deposited Cu and Au sheets.
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Affiliation(s)
- Jiale Liu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
| | - Zhennan Wu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
| | - Tingting Li
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
| | - Ding Zhou
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
| | - Kai Zhang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
| | - Yu Sheng
- Department of Dermatology, First Affiliated Hospital, Harbin Medical University, Harbin 150001, P. R. China.
| | - Jianli Cui
- Department of Hand & Foot Surgery, The First Hospital of Jilin University, Changchun 130021, P. R. China.
| | - Hao Zhang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
| | - Bai Yang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
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26
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Jones PV, Huey S, Davis P, McLemore R, McLaren A, Hayes MA. Biophysical separation of Staphylococcus epidermidis strains based on antibiotic resistance. Analyst 2015; 140:5152-61. [PMID: 26086047 PMCID: PMC4541286 DOI: 10.1039/c5an00906e] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Accepted: 06/06/2015] [Indexed: 11/21/2022]
Abstract
Electrophoretic and dielectrophoretic approaches to separations can provide unique capabilities. In the past, capillary and microchip-based approaches to electrophoresis have demonstrated extremely high-resolution separations. More recently, dielectrophoretic systems have shown excellent results for the separation of bioparticles. Here we demonstrate resolution of a difficult pair of targets: gentamicin resistant and susceptible strains of Staphylococcus epidermidis. This separation has significant potential implications for healthcare. This establishes a foundation for biophysical separations as a direct diagnostic tool, potentially improving nearly every figure of merit for diagnostics and antibiotic stewardship. The separations are performed on a modified gradient insulator-based dielectrophoresis (g-iDEP) system and demonstrate that the presence of antibiotic resistance enzymes (or secondary effects) produces a sufficient degree of electrophysical difference to allow separation. The differentiating factor is the ratio of electrophoretic to dielectrophoretic mobilities. This factor is 4.6 ± 0.6 × 10(9) V m(-2) for the resistant strain, versus 9.2 ± 0.4 × 10(9) V m(-2) for the susceptible strain. Using g-iDEP separation, this difference produces clear and easily discerned differentiation of the two strains.
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Affiliation(s)
- Paul V. Jones
- Arizona State University , Department of Chemistry and Biochemistry , Tempe , AZ 85287 , USA . ; Fax: +(480) 965-2747 ; Tel: +(480) 965-2566
| | - Shannon Huey
- Arizona State University , Department of Chemistry and Biochemistry , Tempe , AZ 85287 , USA . ; Fax: +(480) 965-2747 ; Tel: +(480) 965-2566
| | - Paige Davis
- Arizona State University , Department of Chemistry and Biochemistry , Tempe , AZ 85287 , USA . ; Fax: +(480) 965-2747 ; Tel: +(480) 965-2566
| | - Ryan McLemore
- Arizona State University , Department of Chemistry and Biochemistry , Tempe , AZ 85287 , USA . ; Fax: +(480) 965-2747 ; Tel: +(480) 965-2566
| | - Alex McLaren
- Arizona State University , Department of Chemistry and Biochemistry , Tempe , AZ 85287 , USA . ; Fax: +(480) 965-2747 ; Tel: +(480) 965-2566
| | - Mark A. Hayes
- Arizona State University , Department of Chemistry and Biochemistry , Tempe , AZ 85287 , USA . ; Fax: +(480) 965-2747 ; Tel: +(480) 965-2566
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27
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Abstract
Electrophoretic deposition of ligand-free platinum nanoparticles has been studied to elucidate how wettability, indicated by contact angle measurements, is linked to vital parameters of the electrophoretic deposition process. These parameters, namely the colloid concentration, electric field strength and deposition time, have been systematically varied in order to determine their influence on the contact angle. Additionally, scanning electron microscopy has been used to confirm the homogeneity of the achieved coatings.
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28
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Abstract
Magnesium and magnesium alloys are gaining considerable attention for use in biomedical applications due to their capability to completely resorb in the human body without noticeable side effects. For structural biomedical applications however, the resorption rate is too large. In order to decrease this rate researchers are investigating magnesium alloys with an increased corrosion resistance and/or biodegradable coatings, such as dense protein layers, which retard the resorption.In this work, we demonstrate the electrophoretic deposition of Bovine Serum Albumin (BSA) directly onto pure magnesium substrates using unbalanced alternating fields (AC-EPD). The effect of the obtained coatings on the corrosion behavior of the substrates was evaluated by potentiodynamic polarization. The results show that an albumin layer deposited by AC-EPD from a 50/50 ethanol/H2O medium significantly reduces the corrosion rate.
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29
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Rodríguez-Pérez M, Chacón C, Palacios-González E, Rodríguez-Gattorno G, Oskam G. Photoelectrochemical water oxidation at electrophoretically deposited WO3 films as a function of crystal structure and morphology. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.03.022] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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30
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Clavijo S, Membrives F, Boccaccini AR, Santillán MJ. Characterization of polyetheretherketone particle suspensions for electrophoretic deposition. J Appl Polym Sci 2014. [DOI: 10.1002/app.40953] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Silvia Clavijo
- FCAI, University of Cuyo; Av. San Martin 5600 San Rafael Argentina
| | | | - Aldo R. Boccaccini
- Institute of Biomaterials, University of Erlangen-Nuremberg; 91058 Erlangen Germany
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31
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Iso Y, Takeshita S, Isobe T. Electrophoretic deposition and characterization of transparent nanocomposite films of YVO4:Bi3+,Eu3+ nanophosphor and silicone-modified acrylic resin. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:1465-71. [PMID: 24437553 DOI: 10.1021/la404707r] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
We fabricated nanocomposite films from an aqueous suspension of red-emitting YVO4:Bi(3+),Eu(3+) nanoparticles (hydrodynamic size: 22 ± 6 nm) and silicone-modified acrylic resin nanoparticles of (60 ± 15 nm) by electrophoretic deposition under application of a constant voltage. The nanocomposite films were formed from these negatively charged nanoparticles on ITO-coated glass substrates on the anodic side at the volume ratio of nanophosphor:resin ∼ 40:60. According to transmission electron microscopy observations, the YVO4:Bi(3+),Eu(3+) nanoparticles are well-dispersed around the resin nanoparticles. The fabricated films are transparent to the naked eye under white light because both nanoparticles show no absorption and low light scattering in the visible region. A silicone-modified acrylic resin film without the nanophosphor exhibits no absorption in the UV region (>300.0 nm). However, the fabricated nanocomposite films show near-UV absorption owing to the interband transition between the valence band and the conduction band of the YVO4:Bi(3+),Eu(3+) nanoparticles. A sharp emission peak corresponding to the (5)D0 → (7)F2 transition of Eu(3+) is observed at 619.5 nm, under 365.0 nm excitation, for each nanocomposite film. The photoluminescence intensity at 619.5 nm under 365.0 nm excitation is proportional to 1-10(-OD) (OD: optical density at 365.0 nm) for film thicknesses ≤6 μm. This is attributed to the low light scattering from both nanoparticles in the nanocomposite film. Conversely, the observed photoluminescence intensity for film thicknesses >6 μm is higher than the value expected from the proportional relationship. This suggests that the excitation of the nanophosphors efficiently occurs due to multiple scattering of excitation light.
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Affiliation(s)
- Yoshiki Iso
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University , 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
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