Sensor Array for Water Analysis Based on Interdigitated Electrodes Modified With Fiber Films of Poly(Lactic Acid)/Multiwalled Carbon Nanotubes

Oliveira, Juliano Elvis de; Grassi, Viviane; Scagion, Vanessa P.; Mattoso, Luiz H. C.; Glenn, Gregory M.; Medeiros, Eliton S.

doi:10.1109/jsen.2012.2226715

Cited by 26 publications

(19 citation statements)

References 39 publications

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“…There are very few studies reporting the production of SBS nanocomposites. Oliveira, Grassi et al (2013) showed that PLA nanocomposites reinforced with multi-walled carbon nanotubes (MWCNT) was effective in biosensors for the detection of hydrogen peroxide.…”

Section: Introductionmentioning

confidence: 99%

Solution blow spun nanocomposites of poly(lactic acid)/cellulose nanocrystals from Eucalyptus kraft pulp

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Oliveira

Williams

et al. 2017

Carbohydrate Polymers

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Cellulose nanocrystals (CNCs) were extracted from Eucalyptus kraft pulp by sulfuric acid hydrolysis, and esterified with maleic anhydride (CNC). The incorporation of sulfate ester groups on the cellulose surface resulted in higher stability of the nanoparticles in aqueous suspensions and lower thermal stability. Then, PLA/CNC and PLA/CNC nanocomposites were successfully obtained by solution blow spinning (SBS) using dimethyl carbonate (DMC) as solvent. CNC and CNC indicated to be acting both as nucleating agents or growth inhibitors of PLA crystal and tends to favor the formation of PLA crystals of higher stability. A fraction of the nanocrystals indicate to be exposed on the surface of the PLA fibers, since the hydrophilicity of the composite films increased significantly. Such composites may have potential application as filtering membranes or adsorbents.

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Section: Introductionmentioning

confidence: 99%

Solution blow spun nanocomposites of poly(lactic acid)/cellulose nanocrystals from Eucalyptus kraft pulp

Parize

Oliveira

Williams

et al. 2017

Carbohydrate Polymers

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“…Authors combined Fourier transform infrared spectroscopy (FTIR) and Langmuir isotherms (surface pressure vs. area) to explore the physical interactions formed between lignin phenyl groups and Cu 2+ ions dispersed in an aqueous solution to explain the observed differences in impedance measurements [49]. Multi-walled carbon nanotubes (MWCNT) and polylactic acid (PLA) nanofiber nanocomposites were explored in a similar impedimetric e-tongue integrated into a flow injection analysis system to analyze potable waters contaminated with trace levels of heavy metals (Ba 2+ (1.0 ppm), Cd 2+ (0.001 ppm), Cu 2+ (0.01 ppm), Pb 2+ (0.01 ppm), Ni 2+ (0.025 ppm), Mn 2+ (0.1 ppm), and Fe 3+ (0.3 ppm)) [50], enabling the distinction of contaminants through principal component analysis (PCA). Later, Teodoro et al explored ternary nanocomposites based on electrospun nylon nanofibers, cellulose nanowhiskers, and silver nanoparticles as the sensing layers.…”

Section: E-tongues Applied In Heavy Metals Detectionmentioning

confidence: 99%

Heavy Metal/Toxins Detection Using Electronic Tongues

2019

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The growing concern for sustainability and environmental preservation has increased the demand for reliable, fast response, and low-cost devices to monitor the existence of heavy metals and toxins in water resources. An electronic tongue (e-tongue) is a multisensory array mostly based on electroanalytical methods and multivariate statistical techniques to facilitate information visualization in a qualitative and/or quantitative way. E-tongues are promising analytical devices having simple operation, fast response, low cost, easy integration with other systems (microfluidic, optical, etc) to enable miniaturization and provide a high sensitivity for measurements in complex liquid media, providing an interesting alternative to address many of the existing environmental monitoring challenges, specifically relevant emerging pollutants such as heavy metals and toxins.

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“…Multi solid-state sensor arrays as electronic tongues (e-tongues) can fulfill these requirements, once they make use of the global selectivity concept, in which a set of sensors is able to classify complex solutions, even with similar composition, without the requirement of specific interactions [12][13][14][15]. An important aspect is the design and composition of the sensing layers of the e-tongues [15][16][17][18][19], which can provide a different analytical profile for each analyzed solution. Although generating a great amount of data, statistical analysis and chemometric tools can help reaching the classification of complex solutions, even with very similar compositions [14].…”

Section: Introductionmentioning

confidence: 99%

Tuning the Electrical Properties of Electrospun Nanofibers with Hybrid Nanomaterials for Detecting Isoborneol in Water Using an Electronic Tongue

et al. 2019

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The presence of contaminants in water is a subject of paramount importance nowadays, which can make water improper to human consumption even when these contaminants are present at very low concentrations, causing health issues and economic losses. In this work, we evaluated the performance of nanocomposites based on nylon 6,6/chitosan electrospun nanofibers modified by cellulose nanowhiskers combined with functional materials like silver nanoparticles, gold nanoparticles, and reduced graphene oxide to be used as sensing layers of an electronic tongue (e-tongue) to detect Isoborneol. This compound, found in some plants and essential oils, is used as a natural repellent and also to produce many other chemicals. Additionally, its chemical structure is related to that of 2-methylisoborneol, a critical pollutant in aqueous media. The synergism between the nanomaterials combined with electrospun nanofibers could be verified by the enhancement of the charge transference ability. Additionally, electrical capacitance data measured with the impedimetric e-tongue were treated by Principal Component Analysis (PCA), and revealed the sensing system was able to discriminate samples contaminated with Isoborneol at nanomolar concentrations. Moreover, the electronic tongue system could detect Isoborneol in real water samples under different concentrations.

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Sensor Array for Water Analysis Based on Interdigitated Electrodes Modified With Fiber Films of Poly(Lactic Acid)/Multiwalled Carbon Nanotubes

Cited by 26 publications

References 39 publications

Solution blow spun nanocomposites of poly(lactic acid)/cellulose nanocrystals from Eucalyptus kraft pulp

Solution blow spun nanocomposites of poly(lactic acid)/cellulose nanocrystals from Eucalyptus kraft pulp

Heavy Metal/Toxins Detection Using Electronic Tongues

Tuning the Electrical Properties of Electrospun Nanofibers with Hybrid Nanomaterials for Detecting Isoborneol in Water Using an Electronic Tongue

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