Electrochemically Switched Separation of Yttrium Ion Using Electroactive Nickel Hexacyanoferrate Thin Films in Rare Earth Metal Solution
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Electroactive nickel hexacyanoferrate (NiHCF) thin films were synthesized by cathodic deposition and investigated as electrochemically switched ion exchange (ESIX) materials for the separation of Y3+ from aqueous solutions. In 0.1 mol·L-1 Y(NO3)3 solution, cyclic voltammetry (CV) combined with electrochemical quartz crystal microbalance (EQCM) technique was used to investigate the electroactivity, reversibility of the film electrodes and the mechanism of ion exchange. The electrochemical behavior of NiHCF film electrodes was also compared with that in Sr(NO3)2 solutions. The ion selectivity of the film was investigated in 0.1 mol·L-1 solutions containing [Y(NO3)3 + Sr(NO3)2]. The elementary composition of NiHCF films in reduced and oxidized forms were also characterized by X-ray photoelectron spectroscopy (XPS). Experimental results show that the electroactive NiHCF films have reversible electrochemical behavior in aqueous solutions containing Y3+ and Sr2+, respectively. The NiHCF film electrodes displayed a high Y3+ selectivity in Y3+/Sr2+ binary mixtures and the Y3+ ions could be separated effectively from aqueous solutions by ESIX processes.Keywords:
Quartz Crystal Microbalance
A piezoelelctric quartz-crystal plate can be used as a microbalance (a quartz-crystal microbalance, QCM). When substances adsorbed on a gold electrode, a fundamental frequency of a QCM is decreased linearly with increasing mass on the electrode. The host molecule-immobilized QCM is used as a biosensor responding to the addition of guest molecules in aqueous solution in nanogram level.
Quartz Crystal Microbalance
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Quartz Crystal Microbalance
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Quartz crystal microbalance with dissipation (QCM-D) is a novel technology for the analysis of surface phenomena, which provides a real-time and label-free method of studying macromolecule adsorption and/or interaction on various surfaces with high sensitivity (1 ng/cm2). In recent years, the development of QCM-D instruments and mathematical modeling techniques has enabled a dramatic boost in QCM-D's novel applications in biomaterial research. In this chapter, we first explain the instrumentation and theory behind the QCM-D platform. Then some well-studied areas of application are introduced, including real-time monitoring adsorption and desorption kinetics; thickness, hydration and structural changes of attached biopolymers layers; mechanisms and kinetic studies of specific immunoassays; studies of the affinity of nanoscaled materials to biomolecules; and so on. Plenty of studies have also reported the design of a QCM-D sensor for immunosensing, with high specificity and sensitivity for food, agricultural and pharmaceutical applications.
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In recent years, there has been a rapid growth in the number of scientific reports in which the quartz crystal microbalance (QCM) technique has played a key role in elucidating various aspects of biological materials and their interactions. This article illustrates some key advances in the development of a special variation of this technique called quartz crystal microbalance with dissipation monitoring (QCM-D). The main feature and advantage of QCM-D, compared with the conventional QCM, is that it in addition to measuring changes in resonant frequency (Deltaf), a simultaneous parameter related to the energy loss or dissipation (DeltaD) of the system is also measured. Deltaf essentially measures changes in the mass attached to the sensor surface, while DeltaD measures properties related to the viscoelastic properties of the adlayer. Thus, QCM-D measures two totally independent properties of the adlayer. The focus of this review is an overview of the QCM-D technology and highlights of recent applications. Specifically, recent applications dealing with DNA, proteins, lipids, and cells will be detailed. This is not intended as a comprehensive review of all possible applications of the QCM-D technology, but rather a glimpse into a few highlighted application areas in the biomolecular field that were published in 2007.
Quartz Crystal Microbalance
Characterization
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Sensors of quartz crystal microbalance (QCM) based on thin nano scale films for detection of volatile chemicals by utilizing resonance frequency change allow to detect at the trace mass change of the chemicals attached on surfaces of the QCM at nano gram level. Development of the detection film for the QCM sensor is important, because the characteristics of the QCM sensor depend on the structure of the detection film. The detection mechanisms of the QCM sensors are classified into three types as follows: a) direct reaction type, b) hybrid reaction type, c) detection membrane type (increase or decrease system). The recently developed sensors detected volatile chemicals at extremely low concentrations almost independent on temperature and humidity.
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In this paper we study the possibility to develop an alternative Analytical Method for Investigation in Real‐Time of Liquid Properties, the layout and the operation with Quartz Crystal Microbalance (QCM) Systems. The quartz crystal microbalance (QCM) can be accepted as a powerful technique to monitor adsorption and desorption processes at interfaces in different chemical and biological areas. In our paper, Quartz Crystal Microbalance is used to monitor in real‐time the polymer adsorption followed by azoic dye adsorption and then copolymer adsorption as well as optimization of interaction processes and determination of solution effects on the analytical signal. The solutions of azoic dye (5⋅10−4 g/L, 5⋅10−5 g/L and 5⋅10−6 g/L in DMF) are adsorbed at gold electrodes of QCM and the sensor responses are estimated through decrease and increase of QCM frequency. Also, the response of the sensor at maleic anhydride (MA) copolymer with styrene St (MA‐St copolymer concentration of solution: 5⋅10−4 g/L; 5⋅10−5 g/L and 5⋅10−6 g/L in DMF) is fast, large, and reversible. The detailed investigation showed the fact that the Quartz Crystal Microbalance is a modern method to study a wider number of physical and chemical properties related to the surface and interfacial processes of synthesized copolymer leading to a higher reliability of the research results.
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Maleic anhydride
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The quartz crystal microbalance with dissipation (QCM-D) represented a substantial breakthrough in the use of the QCM sensor in diverse applications ranging from environmental monitoring to biomedical diagnostics. To obtain the required selectivity and sensitivity of a volatile organic compounds (VOC) sensor, it is necessary to coat the QCM sensor with a sensing film. As the QCM sensor is coated with the sensing film, an increase in the dissipation factor occurs, resulting in a shorter and shorter ring-down time. This decrease in ring-down time makes it difficult to implement the QCM-D method in an economical and portable configuration from the perspective of large-scale applications. To compensate for this effect, a regenerative method is proposed by which the damping effect produced by the sensing film is eliminated. In this sense, a regenerative circuit as an extension to a virtual instrument is proposed to validate the experimental method. The simulation of the ring-down time for the QCM sensor in the air considering the effect of the added sensing film, followed by the basic theoretical concepts of the regenerative method and the experimental results obtained, are analyzed in detail in this paper.
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膜を用いた浄水処理には従来の処理と比較して様々な利点がある一方で,膜ファウリングが大きな問題となる.近年の研究においてバイオポリマーと総称される高分子量親水性有機物が膜ファウリングの発生に強く関与することが示唆されている.本研究では特徴の異なる複数の原水よりバイオポリマーを回収・精製し,これらが発生させる膜ファウリングの差異について検討した.バイオポリマー濃度を統一して実施した膜ろ過試験では原水毎に膜ファウリング発生速度が明らかに異なっており,原水が異なるとバイオポリマーの特性が変化することが示された.バイオポリマー特性の差異はLC-OCDを用いた分子量分布測定,赤外スペクトル分析においても明白であり,バイオポリマーの大半が多糖類より構成される場合には不可逆的ファウリングの発生をより深刻にする可能性が示された.消散監視機能付き水晶振動子マイクロバランス(QCM-D)による分析では興味深い結果が得られた.QCM-D分析において膜材質ポリマーであるPVDFとの高い親和性が示されたバイオポリマーが高い膜ファウリングポテンシャルを有していた.また,バイオポリマーの粘弾性がファウリングの可逆性を説明する可能性が示唆された.今後QCM-Dを用いた分析データを充実させていくことで,膜ファウリングが発生しにくい膜材質を適切に選定できる可能性がある.
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Biofouling
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