Ultrasensitive and selective detection of MnO4− in aqueous solution with fluorescent microgels

Zhu, Zhaolin; Xue, Jinqiao; Wen, Bin; Ji, Wei; Du, Binyang; Nie, Jun

doi:10.1016/j.snb.2019.04.103

Cited by 29 publications

(16 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar phenomena had been previously observed. 30,47 Furthermore, such thermosensitive fluorescence of PNI-5VAQ microgels was also reversible. The full fluorescent spectra of PNI-5VAQ microgel aqueous suspension during the cooling process are shown in Figure S5.…”

Section: ■ Results and Discussionmentioning

confidence: 93%

“…The reports of microgels with self-regulating properties were few. 20,29,30 van Hest and co-workers reported that a pHresponsive hybrid microgel, which was prepared by free radical emulsion polymerization of poly(oligoethylene glycol methacrylate) (POEGMA), N,N-diethylaminoethyl methacrylate (DEAEMA), and ethylene glycol dimethacrylate (EGDMA) and chemically functionalized with urease and fluorescein moieties, exhibited self-regulated size switch and fluorescence intensity mediated by the urease-based enzymatic reaction. 20 In this case, the acidic urea and alkaline ammonia generated from urea by urease formed the nonequilibrium feedback loop for the self-regulating properties of the microgels.…”

Section: ■ Introductionmentioning

confidence: 99%

“…29 We reported recently the PNI−MSPC microgels with self-regulating hydrodynamic size and fluorescence properties via feeding a chemical fuel, namely sodium dithionite (Na 2 S 2 O 4 ), which were fabricated via surfactant-free emulsion polymerization (SFEP) by using NIPAm as the monomer and a dichlorinated 1,1′-di [4-(vinyl)benzyl]-4,4′-pyridinium salt (MSPC 2+ •2Cl − ) as the cross-linker. 30 The two-step reversible redox nonequilibrium processes of viologen moieties in the PNI−MSPC microgels rendered the PNI−MSPC microgels self-regulating properties. 30 In the present work, we further reported a new type of functional microgels, coded as PNI-xVAQ microgels, with selfregulating properties and internal phase-separated nanodomains, which were fabricated via SFEP with NIPAm as the main monomer, 2-vinylanthraquinone (VAQ) as the comonomer, N,N′-methylenebis(acrylamide) (BIS) as the cross-linker, and 2,2′-azobis(2-methylpropionamidine) dihydrochloride (AIBA) as the initiator, as shown in Scheme 1.…”

Section: ■ Introductionmentioning

confidence: 99%

“…30 The two-step reversible redox nonequilibrium processes of viologen moieties in the PNI−MSPC microgels rendered the PNI−MSPC microgels self-regulating properties. 30 In the present work, we further reported a new type of functional microgels, coded as PNI-xVAQ microgels, with selfregulating properties and internal phase-separated nanodomains, which were fabricated via SFEP with NIPAm as the main monomer, 2-vinylanthraquinone (VAQ) as the comonomer, N,N′-methylenebis(acrylamide) (BIS) as the cross-linker, and 2,2′-azobis(2-methylpropionamidine) dihydrochloride (AIBA) as the initiator, as shown in Scheme 1.…”

Section: ■ Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Multiresponsive Microgels with Phase-Separated Nanodomains and Self-Regulating Properties via Incorporation of Anthraquinone Moieties

Zhu

Dong

et al. 2020

Langmuir

Self Cite

View full text Add to dashboard Cite

Of the multitude of stimuli-responsive microgels, it is still a challenge to achieve multiple responsivenesses to one single stimulus, which can even revert to the corresponding original state autonomously after stimulus. In this work, we reported a series of anthraquinone functionalized microgels (PNI-xVAQ) with thermosensitivity and redox-actuated self-regulating color, size, and fluorescent properties, which were easily synthesized via surfactant-free emulsion copolymerization (SFEP) with N-isopropylacrylamide (NIPAm) as the monomer, 2-vinylanthraquinone (VAQ) as the comonomer, and N,N′-methylenebis(acrylamide) (BIS) as the cross-linker in an aqueous solution at 70 °C. The hydrophobic interactions of comonomer VAQ also led to the formation of internal phase-separated hydrophobic nanodomains in the obtained PNI-xVAQ microgels. The self-regulating color, size, and fluorescence changes of the PNI-xVAQ microgels were reliant on the nonequilibrium redox process of anthraquinone moieties by the addition of sodium dithionite as the chemical fuel to activate the positive feedback that was the reduction of anthraquinone to transient anthraquinone radical anions, following the slow oxidation of anthraquinone radical anions by autonomous “breathing” oxygen in air as the delayed negative feedback. These autonomous self-regulating properties of the PNI-xVAQ microgel were recyclable to a certain extent by repeated feeding of sodium dithionite.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 93%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Multiresponsive Microgels with Phase-Separated Nanodomains and Self-Regulating Properties via Incorporation of Anthraquinone Moieties

Zhu

Dong

et al. 2020

Langmuir

Self Cite

View full text Add to dashboard Cite

show abstract

“…Potassium permanganate (KMnO 4 ) is a well-known strong oxidant which widely serves as a disinfectant in our daily life or is used in the treatment of pollutants in water [ 45 , 46 ]. However, excess MnO 4 − in drinking or environmental water can lead to respiratory infections and skin irritation [ 47 , 48 , 49 ]. Therefore, the content of residual MnO 4 − in treated water should be strictly monitored.…”

Section: Introductionmentioning

confidence: 99%

Microfluidic Production of Autofluorescent BSA Hydrogel Microspheres and Their Sequential Trapping for Fluorescence-Based On-Chip Permanganate Sensing

Liu

Xiang

et al. 2020

Sensors

View full text Add to dashboard Cite

Microfabrication technologies have extensively advanced over the past decades, realizing a variety of well-designed compact devices for material synthesis, separation, analysis, monitoring, sensing, and so on. The performance of such devices has been undoubtedly improved, while it is still challenging to build up a platform by rationally combining multiple processes toward practical demands which become more diverse and complicated. Here, we present a simple and effective microfluidic system to produce and immobilize a well-defined functional material for on-chip permanganate (MnO4−) sensing. A droplet-based microfluidic approach that can continuously produce monodispersed droplets in a water-in-oil system is employed to prepare highly uniform microspheres (average size: 102 μm, coefficient of variation: 3.7%) composed of bovine serum albumin (BSA) hydrogel with autofluorescence properties in the presence of glutaraldehyde (GA). Each BSA hydrogel microsphere is subsequently immobilized in a microchannel with a hydrodynamic trapping structure to serve as an independent fluorescence unit. Various anions such as Cl−, NO3−, PO43−, Br−, BrO3−, ClO4−, SCN−, HCO3−, and MnO4− are individually flowed into the microchannel, resulting in significant fluorescence quenching only in the case of MnO4−. Linear correlation is confirmed at an MnO4− concentration from 20 to 80 μM, and a limit of detection is estimated to be 1.7 μM. Furthermore, we demonstrate the simultaneous immobilization of two kinds of different microspheres in parallel microchannels, pure BSA hydrogel microspheres and BSA hydrogel microspheres containing rhodamine B molecules, making it possible to acquire two fluorescence signals (green and yellow). The present microfluidics-based combined approach will be useful to record a fingerprint of complicated samples for sensing/identification purposes by flexibly designing the size and composition of the BSA hydrogel microspheres, immobilizing them in a desired manner and obtaining a specific pattern.

show abstract

Poly(N‐isopropylacrylamide) and Its Copolymers: A Review on Recent Advances in the Areas of Sensing and Biosensing

Das,

Babu,

Chakraborty

et al. 2024

Adv Funct Materials

View full text Add to dashboard Cite

Stimuli‐responsive polymers have received increasing attention for various applications due to their ability to adapt physical and chemical properties in response to external environmental stimuli. In this regard, poly(N‐isopropylacrylamide) (PNIPAM) is the most extensively studied stimuli‐responsive polymer and, consequently has been prominently featured in (bio)‐sensor development, adaptive coating technology, drug delivery, wound healing, tissue regeneration, artificial actuator design, sensor technology, responsive coatings, and soft robotics. This success can be mainly attributed to the accessible and versatile nature of the PNIPAM platform, thus allowing the synthesis of a wide variety of copolymer architectures, topologies and compositions. Within this review, the structural and compositional features of PNIPAM‐based materials in sensor and biosensor applications are discussed with a focus on the literature from 2016 until now. The reader is provided with the current state of the art regarding PNIPAM‐based sensor development and their molecular design. Finally, the challenges ahead in the successful implementation of PNIPAM‐based sensors are highlighted, as well as the opportunities in the rational design of improved PNIPAM‐based sensors. Altogether, this review provides comprehensive insights into the exciting and rapidly expanding field of PNIPAM‐based sensing systems, which will benefit the chemical, pharmaceutical, textile, and biotech industries is believed.

show abstract

Ultrasensitive and selective detection of MnO4− in aqueous solution with fluorescent microgels

Cited by 29 publications

References 49 publications

Multiresponsive Microgels with Phase-Separated Nanodomains and Self-Regulating Properties via Incorporation of Anthraquinone Moieties

Multiresponsive Microgels with Phase-Separated Nanodomains and Self-Regulating Properties via Incorporation of Anthraquinone Moieties

Microfluidic Production of Autofluorescent BSA Hydrogel Microspheres and Their Sequential Trapping for Fluorescence-Based On-Chip Permanganate Sensing

Poly(N‐isopropylacrylamide) and Its Copolymers: A Review on Recent Advances in the Areas of Sensing and Biosensing

Contact Info

Product

Resources

About