Determination of Hg(II) at sub-nanomolar levels: A comparative study with nanofibrous materials and continuous thin films

Ongun, Merve Zeyrek; Ertekin, Kadriye; Hızlıateş, Cevher Gündoğdu; Öter, Özlem; Ergün, Yavuz; Çelik, Erdal

doi:10.1016/j.snb.2013.01.055

Cited by 14 publications

(18 citation statements)

References 20 publications

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“…1.3). [74][75][76][77][78][79][80] Polymer/IL composites are obtained either by a simple casting of the liquid sensing cocktail on an appropriate support (commonly a polyester or glass slide) or by electrospinning. The resultant materials are continuous thin and bulk films (the thickness is several and 200 μm, respectively) Fig.…”

Section: ·2 Materials Varieties and Preparation Methodsmentioning

confidence: 99%

“…74 [74][75][76][77][78][79][80] Owing to the use of [EMIm]BF4 in EC and PMMA thin films, the sensitivity of the CO2 sensor increased, the hyperbolic response of the recognition element (HPTS)/(TOA)4 in the working concentration range of CO2 straightened, HPTS photostability was enhanced and the sensor lifetime was prolonged up to 95 days under ambient conditions. 75 Note that IL-free sensors completely lost their sensing capability within 3 days.…”

Section: ·2 Ionic Liquids As Additives In Polymer Matricesmentioning

confidence: 99%

“…74 [EMIm]BF4 served as an additive to EC and PMMA for fabricating the continuous thin films and the electrospun nanofibers for the sensitive, rapid, and reproducible fluorescent determination of metal ions. [77][78][79] In the course of Fe(III) determination, [EMIm]BF4 in the EC matrix provided a highly stable, spectroscopically available microenvironment for the immobilized recognition element N′-(4-cyanobenzylidene)-isonicotinohydrazide (CBINH). 77 The fluorophores 1,2-bis(4-methoxybenzylidene)hydrazine (M-AZM) and 2-(9-methyl-9H-carbazol-3-yl)-5-(pyridine-4-yl)-1,3,4-oxidiazole (ODC-3) that were doped into modified EC and PMMA matrices along with the anionic additive (potassium tetrakis-(4-chlorophenyl) borate) extracted Ag(I) and Hg(II) ions, respectively, because of the ionexchange mechanism.…”

Section: ·2 Ionic Liquids As Additives In Polymer Matricesmentioning

confidence: 99%

“…77 The fluorophores 1,2-bis(4-methoxybenzylidene)hydrazine (M-AZM) and 2-(9-methyl-9H-carbazol-3-yl)-5-(pyridine-4-yl)-1,3,4-oxidiazole (ODC-3) that were doped into modified EC and PMMA matrices along with the anionic additive (potassium tetrakis-(4-chlorophenyl) borate) extracted Ag(I) and Hg(II) ions, respectively, because of the ionexchange mechanism. 78,79 Meanwhile, potassium ions diffused from the membrane into the aqueous phase. Acting as a sink for acidic or basic species from the ambient air of the laboratory, [EMIm]BF4 enhanced the photostability of M-AZM and ODC-3 in the polymer matrices by up to 7 and 5 months, respectively.…”

Section: ·2 Ionic Liquids As Additives In Polymer Matricesmentioning

confidence: 99%

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Applications of Ionic Liquids for the Development of Optical Chemical Sensors and Biosensors

et al. 2017

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This paper reviews the primary literature reporting the use of ionic liquids (ILs) in optical sensing technologies. The optical chemical sensors that have been developed with the assistance of ILs are classified according to the type of resultant material. Key aspects of applying ILs in such sensors are revealed and discussed. They include using ILs as solvents for the synthesis of sensor matrix materials; additives in polymer matrices; matrix materials; modifiers of the surfaces; and multifunctional sensor components. The operational principles, design, texture, and analytical characteristics of the offered sensors for determining CO2, O2, metal ions, CN -, and various organic compounds are critically discussed. The key advantages and disadvantages of using ILs in optical sensing technologies are defined. Finally, the applicability of the described materials for chemical analysis is evaluated, and possibilities for their further modernization are outlined.

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Section: ·2 Materials Varieties and Preparation Methodsmentioning

confidence: 99%

Section: ·2 Ionic Liquids As Additives In Polymer Matricesmentioning

confidence: 99%

Section: ·2 Ionic Liquids As Additives In Polymer Matricesmentioning

confidence: 99%

Section: ·2 Ionic Liquids As Additives In Polymer Matricesmentioning

confidence: 99%

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Applications of Ionic Liquids for the Development of Optical Chemical Sensors and Biosensors

et al. 2017

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“…不仅可将多种合成和天然聚合物电纺成单一纳米纤维 [2,3] , 还可以得到复合纳米纤维材料, 例如同轴纺丝 [4] 、三轴纺丝 [5,6] 、多层交叉纺丝等 [7～9] 技术的应用, 推动了该技术的快速发展. 由于纳米纤维材料性能的优良特性, 在膜过滤器 [10,11] 、组织工程支架 [12,13] 、生物工程 [14] 、临床医学 [15,16] 、超敏传感器 [17,18] 、锂电池材料 [19] 和超级电容器 [20] 等方面具有巨大的研究价值. 然而, 目前能进行静电纺丝的常用聚合物种类还相对较少, 主要集中在聚乙烯醇(PVA) [21,22] 、聚丙烯腈(PAN) [23,24] 、聚乙烯吡咯烷酮 (PVP) [5,6,25] 等, 而对多糖类物质和天然聚合物的静电纺丝研究一直是该领域的难点 [26～28] , 极度限制了静电纺丝研究的进一步发展.…”

Section: 引言unclassified

Study on Synthesis, Rheological and Electrospinning Functional Materials of Carboxymethyl Cellulose Lithium (CMC-Li)

邱磊¹,

邵自强²,

王建全³

et al. 2013

Acta Chim. Sinica

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The study on electrospinning of natural polysaccharide polymer to be nano-crystallized is still difficult in the current time. Carboxymethyl cellulose sodium (CMC-Na) was successfully synthesized and acidized to obtain carboxymethyl cellulose hydrogen (CMC-H), and new ionic cellulose ether CMC-Li was synthesized by alkalization, and then we analyzed the difference of structure between the three products. By comparing the rheological measurement and analysis of CMC-Na and CMC-Li, which have different mass fractions, it is found that they both show the characteristics of non-Newtonian fluid. The non-Newtonian index of CMC-Li is lower than that of CMC-Na when the degree of substitution (DS) and viscosity of both is similar. For the same material, the ionic cellulose ether solution of lower DS and higher concentration shows the lower non-Newtonian index. For the structure and property characteristic of polymers, it was easy to combine them with water-soluble hydroxyl terminated high molecular weight polyethylene oxide (PEO) to allocate the excellent electrospinning solution. Processing conditions were adjusted to a flow rate of 4 mL/h, an applied voltage of 25 kV, the spinning distance of 12 cm, the better appearance of nanofibers whose average diameter is about 70 nm can be obtained. In the process of electrospinning, hydroxyl lithium ester enolates was obtained by reductive reaction of the ionized Li ＋ with active hydroxyl, which caused the molecular structure to be destroyed. CMC-Li showed the exceptional Non-Newtonian fluid properties and had the better spinning performance than CMC-Na. When the surface tension of liquid was damaged by external electric force of spinning voltage to balance each other, the obtained morphology of the fiber was better. Nano-aluminum powder is coated with CMC-Li to form composite nanofibers, and carbonized at the high temperatures. Al/CNF/Li composite fiber was obtained in which nano particles were uniformly distributed. We preliminarily studied the obtained composite material that remained morphology and structure of fiber, which lays the foundation for the later research that the material is applied to soluble membrane, tissue engineering scaffolds, biological medicine, lithium battery and super capacitor, etc. The satisfactory effects have been achieved through analysis of IR, Rheology and SEM. The paper expands the type of polysaccharide polymer that can be electrospun and filled the void of related research, and it also lays the foundation for the study on nano functional materials of new ionic cellulose ether.

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Colorimetric Nanofibers as Optical Sensors

Schoolaert

Hoogenboom

Clerck

2017

Adv Funct Materials

110

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Sensors play a major role in many applications today, ranging from biomedicine to safety equipment, where they detect and warn us about changes in the environment. Nanofibers, characterized by high porosity, flexibility, and a large specific surface area, are the ideal material for ultrasensitive, fastresponding, and user-friendly sensor design. Indeed, a large specific surface area increases the sensitivity and response time of the sensor as the contact area with the analyte is enlarged. Thanks to the flexibility of membranes, nanofibrous sensors cannot only be applied in high-end analyte detection, but also in personal, daily use. Many different nanofibrous sensors have already been designed; albeit, the most straightforward and easiest-to-interpret sensor response is a visual change in color, which is of particular interest in the case of warning signals. Recently, many researchers have focused on the design of so-called colorimetric nanofibers, which typically involve the incorporation of a colorimetric functionality into the nanofibrous matrix. Many different strategies have been used and explored for colorimetric nanofibrous sensor design, which are outlined in this feature article. The many examples and applications demonstrate the value of colorimetric nanofibers for advanced optical sensor design, and could provide directions for future research in this area.

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Determination of Hg(II) at sub-nanomolar levels: A comparative study with nanofibrous materials and continuous thin films

Cited by 14 publications

References 20 publications

Applications of Ionic Liquids for the Development of Optical Chemical Sensors and Biosensors

Applications of Ionic Liquids for the Development of Optical Chemical Sensors and Biosensors

Study on Synthesis, Rheological and Electrospinning Functional Materials of Carboxymethyl Cellulose Lithium (CMC-Li)

Colorimetric Nanofibers as Optical Sensors

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