Optofluidic Technology for Water Quality Monitoring

Wang, Ning; Dai, Ting; Lei, Lei

doi:10.3390/mi9040158

Cited by 18 publications

(16 citation statements)

References 53 publications

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“…Between the solution samples and the OFC, there were two quartz sheets (5 mm × 5 mm × 100 µm) inserted to avoid the influence on the optical absorption test. The details and cross section of the Z-shaped flow cell are shown in Figure 1b, which is mainly constructed by PDMS-based microchannel with the dimension of 10 mm (L) × 1.5 mm (W) × 1.5 mm (H), and a couple of optical fiber collimators output with a multimode optical fiber (MMF) pigtail embedded on both sides of the flow cell [15]. The fabrication details are similar to our previous work [6].…”

Section: Device Designmentioning

confidence: 99%

An Integrated Optofluidic Platform Enabling Total Phosphorus On-Chip Digestion and Online Real-Time Detection

et al. 2020

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This paper presents a total phosphorus online real-time monitoring system integrated with on-chip digestion based on the merits of optofluidic technology. The integrated optofluidic device contains a hollow optical fiber employed for pretreatment and digestion of phosphorus solution samples, a polydimethylsiloxane (PDMS)-based micromixer with convergent–divergent walls designed to enable sufficient mixing and chromogenic reaction, and a couple of optical fiber collimators attached with a Z-shaped flow cell for optical detection. Details of system design and fabrication are introduced in this paper. In the experiment, on-chip digestion of four typical phosphates in aqueous solution including organophosphorus and inorganic phosphorus is investigated under different reaction conditions, such as digestion temperature, concentration of oxidant and pH value, and the optimal reaction parameters are explored under different conditions. Meanwhile, we demonstrate the online real-time monitoring function of the optofluidic device, and the digestion mechanisms of four different phosphates are analyzed and discussed. Compared with the national standard method, we find that the measurement accuracy and sensitivity are acceptable when the concentration of total phosphorus is between 0.005–0.9 mg/L (by weight of P) in aqueous solution, which covers the range defined in the national standard. The traditional digestion time of several hours is greatly reduced to less than 10 s, and the content of total phosphorus can be obtained in a few minutes. The integrated optofluidic device can significantly shorten the test time and reduce the sample amount, and also provides a versatile platform for the real-time detection and analysis of many biochemical samples.

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Section: Device Designmentioning

confidence: 99%

An Integrated Optofluidic Platform Enabling Total Phosphorus On-Chip Digestion and Online Real-Time Detection

et al. 2020

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“…In this frame, microfluidics and lab-on-a-chip (LOC) developments propose low-cost, multiparameter, real-time, continuous monitoring methods [4,5] while focusing on electrochemical [6] and optical [7] detection techniques. In order to deal with selectivity, beyond the use of several microalgae, the functional integration of electrochemical and optical methods will be required.…”

Section: Introductionmentioning

confidence: 99%

Accurate physiological monitoring using lab-on-a-chip platform for aquatic micro-organisms growth and optimized culture

Belaidi

Salvagnac

Souleille

et al. 2020

Sensors and Actuators B: Chemical

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The present work was dedicated to the development of a lab-on-chip microsystem for the monitoring of microalgal photosynthetic activity. Thanks to integrated electrochemical microcells, dissolved oxygen O2 concentrations due to photosynthetic microalgal activity were measured in a continuous way and oxygen production rates of microalgae cultures were finally determined in the frame of artificial night/day cycles. Application was performed by studying the physiological metabolisms of the green microalga Chlamydomonas reinhardtii. First, the different growth dynamics of microalgal cultures were characterized, enabling the determination of the induction, "exponential growth", "declining growth rate" and stationary phases. Then, the influences of carbon-based nutrients, such as sodium bicarbonate HCO3Na and methanol CH3OH, as well as of pollutants, such as silver nitrate AgNO3, were studied, evidencing contradictory behaviors according to the competition between nutritional properties, toxicity effects and acclimation phenomena. This paves the way to the development of analysis microsystems for the understanding of microalgal metabolisms as well as for the improvement of microalgae growth processes and associated industrial production.

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“…A flourishing field of application of integrated-optic technologies is optical sensing and biochemical analysis on lab-on-chip optofluidic devices [3][4][5]. In these contexts, requirements on the modulation frequency may be less stringent than in telecommunications.…”

Section: Introductionmentioning

confidence: 99%

Resonant opto-mechanical modulators and switches by femtosecond laser micromachining

et al. 2020

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In this work we demonstrate novel integrated-optics modulators and switches, realized in a glass substrate by femtosecond laser pulses. These devices are based on oscillating microcantilevers, machined by water-assisted laser ablation. Single mode-optical waveguides are laser-inscribed inside the cantilever beam and continue in the substrate beyond the cantilever's tip. By exciting the resonant oscillation of the mechanical structure, coupling between the waveguide segments is varied in time. Operation frequencies are in the range of tens of kilohertz, thus they markedly overcome the response-time limitation of other glass-based modulators, which rely on the thermo-optic effect. These components may be integrated in more complex waveguide circuits or optofluidic lab-on-chips, to provide periodic and high-frequency modulation of the optical signals.

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Optofluidic Technology for Water Quality Monitoring

Cited by 18 publications

References 53 publications

An Integrated Optofluidic Platform Enabling Total Phosphorus On-Chip Digestion and Online Real-Time Detection

An Integrated Optofluidic Platform Enabling Total Phosphorus On-Chip Digestion and Online Real-Time Detection

Accurate physiological monitoring using lab-on-a-chip platform for aquatic micro-organisms growth and optimized culture

Resonant opto-mechanical modulators and switches by femtosecond laser micromachining

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