Laser-induced fluorescence visualization of ion transport in a pseudo-porous capacitive deionization microstructure

Demirer, Onur N.; Hidrovo, Carlos

doi:10.1007/s10404-013-1228-3

Cited by 12 publications

(12 citation statements)

References 32 publications

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“…The microfluidic based power generation system has the potential to be readily integrated with existing lab on a chip or in vitro diagnostic microdevices, so we expect that self-powered micro/ nanodevices with a reduced volume and weight can be realized in the near future. Moreover, like previous visualization studies for the ion transport phenomenon using fluorescent dyes, [34][35][36] the ion transport according to the variations of surface properties and geometrical changes can not only be measured with current recording but can also be visualized with fluorescent dyes using the proposed system, so that it can contribute to revealing the still-unclear fundamental mechanism of power-generation.…”

Section: Introductionmentioning

confidence: 97%

Tunable reverse electrodialysis microplatform with geometrically controlled self-assembled nanoparticle network

et al. 2015

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Clean and sustainable energy generation from ambient environments is important not only for large scale systems, but also for tiny electrical devices, because of the limitations of batteries or external power sources. Chemical concentration gradients are promising energy resources to power micro/nanodevices sustainably without discharging any pollutants. In this paper, an efficient microplatform based on reverse electrodialysis, which enables high ionic flux through three dimensional nanochannel networks for high power energy generation, is demonstrated. Highly effective cation-selective nanochannel networks are realized between two microfluidic channels with geometrically controlled in situ self-assembled nanoparticles in a cost-effective and simple way. The nano-interstices between the assembled nanoparticles have a role as collective three-dimensional nanochannel networks and they allow higher ionic flux under concentration gradients without decreasing diffusion potential, compared to standard one-dimensional nanochannels. An in-depth experimental study with theoretical analysis shows that the electrical power of the presented system can be flexibly tuned or further optimized by changing the size, material, and shape of the assembled nanoparticles or by the geometric control of the microchannel. This microfluidic power generation system can be readily integrated with existing lab on a chip systems in the near future and can also be utilized to investigate nanoscale electrokinetics.

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Section: Introductionmentioning

confidence: 97%

Tunable reverse electrodialysis microplatform with geometrically controlled self-assembled nanoparticle network

et al. 2015

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“…To remove ions from the electrolyte solution, a potential of approximately 1 V is applied across two porous electrodes. 55 They studied the transport of the charged fluorescent dyes using concentrations in the μMrange. The storage capacity of the system is proportional to the effective surface area of the electrodes and the potential applied across the electrodes.…”

Section: Capacitive Deionizationmentioning

confidence: 99%

“…In addition to early experimental methods, which were limited to electroĲchemical) analysis at the in-and outlet of desalination system such as CDI, 18,[65][66][67][68][69] in situ measurements using fluorescence microscopy can visualize ion transport, local salt concentration and flow profiles. CDI on-chip was performed by Suss et al 54 and Demirer et al 55 who investigated charging behavior of the cell. An example is the implementation of ED on-chip by Kwak et al 40 who studied the optimal operation mode of ED in terms of energy efficiency.…”

Section: Applicationsmentioning

confidence: 99%

Microfluidic desalination techniques and their potential applications

2015

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In this review we discuss recent developments in the emerging research field of miniaturized desalination. Traditionally desalination is performed to convert salt water into potable water and research is focused on improving performance of large-scale desalination plants. Microfluidic desalination offers several new opportunities in comparison to macro-scale desalination, such as providing a platform to increase fundamental knowledge of ion transport on the nano- and microfluidic scale and new microfluidic sample preparation methods. This approach has also lead to the development of new desalination techniques, based on micro/nanofluidic ion-transport phenomena, which are potential candidates for up-scaling to (portable) drinking water devices. This review assesses microfluidic desalination techniques on their applications and is meant to contribute to further implementation of microfluidic desalination techniques in the lab-on-chip community.

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“…22 Recently CDI has been applied on a chip by using pseudo-porous as well as porous electrodes. 23,24 Suss et al have visualized the transport of Cl − ions through fluorescence microscopy, demonstrating that the process is diffusion limited. Time-dependent ion selectivity was analyzed by Zhao et al who concluded that single valent ions are first absorbed by the electrical double layer and in time replaced with divalent ions.…”

Section: Introductionmentioning

confidence: 99%

Capacitive deionization on-chip as a method for microfluidic sample preparation

et al. 2015

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Desalination as a sample preparation step is essential for noise reduction and reproducibility of mass spectrometry measurements. A specific example is the analysis of proteins for medical research and clinical applications. Salts and buffers that are present in samples need to be removed before analysis to improve the signal-to-noise ratio. Capacitive deionization is an electrostatic desalination (CDI) technique which uses two porous electrodes facing each other to remove ions from a solution. Upon the application of a potential of 0.5 V ions migrate to the electrodes and are stored in the electrical double layer. In this article we demonstrate CDI on a chip, and desalinate a solution by the removal of 23% of Na(+) and Cl(-) ions, while the concentration of a larger molecule (FITC-dextran) remains unchanged. For the first time impedance spectroscopy is introduced to monitor the salt concentration in situ in real-time in between the two desalination electrodes.

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Laser-induced fluorescence visualization of ion transport in a pseudo-porous capacitive deionization microstructure

Cited by 12 publications

References 32 publications

Tunable reverse electrodialysis microplatform with geometrically controlled self-assembled nanoparticle network

Tunable reverse electrodialysis microplatform with geometrically controlled self-assembled nanoparticle network

Microfluidic desalination techniques and their potential applications

Capacitive deionization on-chip as a method for microfluidic sample preparation

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