The Experts below are selected from a list of 20814 Experts worldwide ranked by ideXlab platform
John R. Reynolds - One of the best experts on this subject based on the ideXlab platform.
-
In situ Colorimetric Analysis of electrochromic polymer films and devices
Synthetic Metals, 2001Co-Authors: Barry C. Thompson, Philippe Schottland, Gursel Sonmez, John R. ReynoldsAbstract:Here we present an overview of an in situ method of electrochromic polymer characterization based on the CIE system of colorimetry. As illustrated here for PBuDOP (poly(3,4-butylenedioxypyrrole)), Colorimetric Analysis allows for precise understanding of color change and the accessible color states of an electrochromic polymer. This technique has proven to be a convenient method for the design and construction of electrochromic devices and promises to reduce trial and error in device construction while allowing for the fine-tuning and reproducibility of color.
-
In situ Colorimetric Analysis of electrochromic polymers and devices
Chemistry of Materials, 2000Co-Authors: Barry C. Thompson, Philippe Schottland, Kyukwan Zong, John R. ReynoldsAbstract:We report a Colorimetric method for the in situ study of electrochromic polymers based on the CIE system of colorimetry. This method is useful for the comparison of the electrochemical and optical properties of conjugated polymers, and for gaining control of the color of dual polymer electrochromic devices. Twelve electrochromic polymers were investigated using in situ Colorimetric Analysis in order to define their CIE coordinates and electrochemical potential windows. By controlling the electron density and steric interactions along conjugated polymer backbones, we have developed a set of electrochromic polymers that provides colors throughout the full range of color space. The applicability of the method is illustrated with a model dual polymer device based on poly(2-(3,4-ethylenedioxy)thienyl(biphenyl)) (PBEDOT-BP) and poly(3,6-bis(3,4-ethylenedioxy)thienyl)-N-methylcarbazole) (PBEDOT-NMeCz). This device yields green/brown colors (L* = 48, a* = 0, b* = 20 and L* = 44, a* = 6, b* = 26) interesting for e...
Barry C. Thompson - One of the best experts on this subject based on the ideXlab platform.
-
In situ Colorimetric Analysis of electrochromic polymer films and devices
Synthetic Metals, 2001Co-Authors: Barry C. Thompson, Philippe Schottland, Gursel Sonmez, John R. ReynoldsAbstract:Here we present an overview of an in situ method of electrochromic polymer characterization based on the CIE system of colorimetry. As illustrated here for PBuDOP (poly(3,4-butylenedioxypyrrole)), Colorimetric Analysis allows for precise understanding of color change and the accessible color states of an electrochromic polymer. This technique has proven to be a convenient method for the design and construction of electrochromic devices and promises to reduce trial and error in device construction while allowing for the fine-tuning and reproducibility of color.
-
In situ Colorimetric Analysis of electrochromic polymers and devices
Chemistry of Materials, 2000Co-Authors: Barry C. Thompson, Philippe Schottland, Kyukwan Zong, John R. ReynoldsAbstract:We report a Colorimetric method for the in situ study of electrochromic polymers based on the CIE system of colorimetry. This method is useful for the comparison of the electrochemical and optical properties of conjugated polymers, and for gaining control of the color of dual polymer electrochromic devices. Twelve electrochromic polymers were investigated using in situ Colorimetric Analysis in order to define their CIE coordinates and electrochemical potential windows. By controlling the electron density and steric interactions along conjugated polymer backbones, we have developed a set of electrochromic polymers that provides colors throughout the full range of color space. The applicability of the method is illustrated with a model dual polymer device based on poly(2-(3,4-ethylenedioxy)thienyl(biphenyl)) (PBEDOT-BP) and poly(3,6-bis(3,4-ethylenedioxy)thienyl)-N-methylcarbazole) (PBEDOT-NMeCz). This device yields green/brown colors (L* = 48, a* = 0, b* = 20 and L* = 44, a* = 6, b* = 26) interesting for e...
Hua Wang - One of the best experts on this subject based on the ideXlab platform.
-
In situ growth of CeO2 on g-C3N4 nanosheets toward a spherical g-C3N4/CeO2 nanozyme with enhanced peroxidase-like catalysis: a selective Colorimetric Analysis strategy for mercury(II ).
Nanoscale, 2020Co-Authors: Xiaoting Zhao, Ruotong Gang, Hua WangAbstract:Cerium dioxide (CeO2) nanocatalysts were initially grown in situ on 2D graphitic carbon nitride (g-C3N4) nanosheets to yield the nanocomposites g-C3N4/CeO2 with a spherical structure for the catalysis-based Colorimetric Analysis of Hg2+ ions in blood and wastewater. As the synergetic introduction of g-C3N4 nanosheets might promote the electron transfer in CeO2, the resulting g-C3N4/CeO2 nanozyme was found to present greatly enhanced catalytic activity, as demonstrated by the steady-state kinetic studies, which is nearly 4-fold higher than that of pure CeO2. Moreover, the g-C3N4/CeO2 nanozymes would aggregate in the presence of Hg2+ ions due to the strong interaction between Hg2+ and the nitrogen of g-C3N4, leading to a decrease of catalysis rationally depending on the Hg2+ ion concentration. A Colorimetric Analysis strategy is therefore developed for the selective detection of Hg2+ ions separately in the complex samples of blood and wastewater, showing a linear concentration range from 0.50 nM to 800 nM with the LOD of 0.23 nM as exemplified for Hg2+ ions in blood. Also, the recovery tests indicated that the developed Colorimetric method can allow for the accurate Analysis of Hg2+ ions in wastewater and blood. Such a route for the fabrication of composite nanozymes by growing catalytic nanomaterials on conductive 2D substrates may be extended to the design of other kinds of nanozymes with enhanced catalytic performances for developing catalysis-based detection platforms.
-
Mineralizing gold-silver bimetals into hemin-melamine matrix: A nanocomposite nanozyme for visual Colorimetric Analysis of H2O2 and glucose
Analytica chimica acta, 2019Co-Authors: Huan Liu, Yue Hua, Yuanyuan Cai, Luping Feng, Hua WangAbstract:Abstract A nanocomposite nanozyme has been fabricated through mineralizing gold-silver bimetals into Hemin (Hem)-coupled melamine (MA) polymer matrix for visual Colorimetric Analysis of H2O2 and glucose. Catalytic Hem was cross-linked onto MA scaffold for the mineralization of Au–Ag bimetals yielding the rod-like nanocomposite of MA-Hem/Au–Ag. It was discovered that the resulting nanocomposite could present high aqueous stability and especially improved catalysis, which was more than four-fold higher than that of native Hem. Catalytic kinetics studies indicate that the prepared nanocomposite nanozyme could present much higher affinities to the substrates than those of native Hem or even horseradish peroxidase. Herein, the so mineralized Au–Ag bimetals with the “silver effect” would act as “nanowires” for promoting the electron transferring of nanocomposite nanozyme. Moreover, the Hem-coupled MA polymer matrix with high specific surface area could ensure the high adsorption capacity for the reactant substrates and targeting analytes. The application feasibility of the developed nanocomposite nanozyme was demonstrated subsequently by the Colorimetric assays for H2O2 and glucose separately in milk and blood samples, with the linear ranges of 0.010–2.50 mM and 0.0050–2.0 mM, respectively. Such a bimetal mineralization-based fabrication route may open a new door toward the design of diverse nanocomposites nanozymes with improved catalysis and adsorption performances.
-
Fluorimetric and Colorimetric Analysis of total iron ions in blood or tap water using nitrogen-doped carbon dots with tunable fluorescence
New Journal of Chemistry, 2018Co-Authors: Fengjuan Liu, Yue Hua, Yao Jiang, Chuan Fan, Liyan Zhang, Chunxian Zhang, Ning Song, Yingjie Kong, Hua WangAbstract:Fluorimetric and Colorimetric Analysis strategies have been developed for simultaneously probing Fe3+ and Fe2+ ions in blood or tap water using nitrogen-doped carbon dots (N-Cdots). Herein, the N-Cdots were prepared using melamine by a neutralization heat reaction one-step synthesis route showing high aqueous solubility and environmental stability. Importantly, unlike common carbon dots (Cdots) that generally display one emission of blue fluorescence, they can display excitation-dependent tunable emissions. Moreover, the bright blue-green fluorescence of N-Cdots could be specifically quenched by Fe3+ or Fe2+ ions simultaneously, showing a color change. Herein, the fluorescent quenching of N-Cdots is thought to result from the aggregation of N-Cdots triggered by the unique coordination interactions between Fe3+ or Fe2+ ions and amine and amide groups of N-Cdots. The developed Analysis strategies were employed for the evaluation of the total iron levels in blood or tap water, with a detection limit down to about 5.0 nM, exemplified for Fe3+ ions. These strategies could be promising for use in practical applications for the clinical diagnosis of iron-relative diseases (i.e., anemia and cancers) and environmental monitoring of iron pollution. In addition, this one-step neutralization heat reaction route as a facile green synthesis candidate may be tailored for the fabrication of a variety of Cdots, especially those with doped heteroatoms (i.e., nitrogen) for extensive applications in biomedical and environmental fields.
Philippe Schottland - One of the best experts on this subject based on the ideXlab platform.
-
In situ Colorimetric Analysis of electrochromic polymer films and devices
Synthetic Metals, 2001Co-Authors: Barry C. Thompson, Philippe Schottland, Gursel Sonmez, John R. ReynoldsAbstract:Here we present an overview of an in situ method of electrochromic polymer characterization based on the CIE system of colorimetry. As illustrated here for PBuDOP (poly(3,4-butylenedioxypyrrole)), Colorimetric Analysis allows for precise understanding of color change and the accessible color states of an electrochromic polymer. This technique has proven to be a convenient method for the design and construction of electrochromic devices and promises to reduce trial and error in device construction while allowing for the fine-tuning and reproducibility of color.
-
In situ Colorimetric Analysis of electrochromic polymers and devices
Chemistry of Materials, 2000Co-Authors: Barry C. Thompson, Philippe Schottland, Kyukwan Zong, John R. ReynoldsAbstract:We report a Colorimetric method for the in situ study of electrochromic polymers based on the CIE system of colorimetry. This method is useful for the comparison of the electrochemical and optical properties of conjugated polymers, and for gaining control of the color of dual polymer electrochromic devices. Twelve electrochromic polymers were investigated using in situ Colorimetric Analysis in order to define their CIE coordinates and electrochemical potential windows. By controlling the electron density and steric interactions along conjugated polymer backbones, we have developed a set of electrochromic polymers that provides colors throughout the full range of color space. The applicability of the method is illustrated with a model dual polymer device based on poly(2-(3,4-ethylenedioxy)thienyl(biphenyl)) (PBEDOT-BP) and poly(3,6-bis(3,4-ethylenedioxy)thienyl)-N-methylcarbazole) (PBEDOT-NMeCz). This device yields green/brown colors (L* = 48, a* = 0, b* = 20 and L* = 44, a* = 6, b* = 26) interesting for e...
Run Zhang - One of the best experts on this subject based on the ideXlab platform.
-
Resorufin-based responsive probes for fluorescence and Colorimetric Analysis.
Journal of materials chemistry. B, 2020Co-Authors: Lu Tian, Huan Feng, Zhichao Dai, Run ZhangAbstract:The fluorescence imaging technique has attracted increasing attention in the detection of various biological molecules in situ and in real-time owing to its inherent advantages including high selectivity and sensitivity, outstanding spatiotemporal resolution and fast feedback. In the past few decades, a number of fluorescent probes have been developed for bioassays and imaging by exploiting different fluorophores. Among various fluorophores, resorufin exhibits a high fluorescence quantum yield, long excitation/emission wavelength and pronounced ability in both fluorescence and Colorimetric Analysis. This fluorophore has been widely utilized in the design of responsive probes specific for various bioactive species. In this review, we summarize the advances in the development of resorufin-based fluorescent probes for detecting various analytes, such as cations, anions, reactive (redox-active) sulfur species, small molecules and biological macromolecules. The chemical structures of probes, response mechanisms, detection limits and practical applications are investigated, which is followed by the discussion of recent challenges and future research perspectives. This review article is expected to promote the further development of resorufin-based responsive fluorescent probes and their biological applications.