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Selective detection of Al3+ and citric acid with a fluorescent amphiphile

19-11-2014 | Ziya Köstereli; Kay Severin, Organic & Biomolecular Chemistry, 2014

An amphiphilic fluorescent dye with a disulfonated BODIPY head group and a heptadecyl side chain is described. In buffered aqueous solution, the amphiphile can form aggregates with a critical micelle concentration of [[similar]] 20 μM. The aggregation of the dye is associated with a strong ...


Adsorption of Lysozyme on Silver and Its Influence on Silver Release

14-11-2014 | Xin Wang; Gunilla Herting; Inger Odnevall Wallinder; Eva Blomberg, Langmuir, 2014

Silver is increasingly used in antimicrobial coatings of biomedical devices and implants to hinder infections. As proteins have been shown to largely influence the extent of released metals from various metal surfaces at biological conditions, silver may also be influenced in the same way. The ...


Arsenic-Rich Acid Mine Water with Extreme Arsenic Concentration: Mineralogy, Geochemistry, Microbiology, and Environmental Implications

14-11-2014 | Juraj Majzlan; Jakub Plášil; Radek Škoda; Johannes Gescher; Felix Kögler; Anna Rusznyak; Kirsten Küsel; Thomas R. Ne ..., Environmental Science & Technology, 2014

Extremely arsenic-rich acid mine waters have developed by weathering of native arsenic in a sulfide-poor environment on the 10th level of the Svornost mine in Jáchymov (Czech Republic). Arsenic rapidly oxidizes to arsenolite (As2O3), and there are droplets of liquid on the arsenolite crust with ...


Sensors, Vol. 14, Pages 21535-21548: Magnetic Bead-Based Colorimetric Immunoassay for Aflatoxin B1 Using Gold Nanoparticles

14-11-2014 | Wang, Xu ; Niessner, Reinhard ; Knopp, Dietmar, Sensors, 2014

A competitive colorimetric immunoassay for the detection of aflatoxin B1 (AFB) has been established using biofunctionalized magnetic beads (MBs) and gold nanoparticles (GNPs). Aflatoxin B1-bovine serum albumin conjugates (AFB-BSA) modified MBs were employed as capture probe, which could ...


Ionic‐liquid‐based, manual‐shaking‐ and ultrasound‐assisted, surfactant‐enhanced emulsification microextraction for the determination of three fungicide residues in juice samples

13-11-2014 | Xiaochu Chen, Xiangwei You, Fengmao Liu, Fan Hou, Xu Zhang, Journal of Separation Science, 2014

A novel manual shaking and ultrasound‐assisted surfactant‐enhanced emulsification microextraction method was developed for the determination of three fungicides in juice samples. In this method, the ionic liquid, 1‐ethyl‐3‐methylimidazolium bis[(trifluoromethyl)sulfonyl]imide, instead of a ...


Cyclodextrins and Surfactants in Aqueous Solution above the Critical Micelle Concentration: Where Are the Cyclodextrins Located?

13-11-2014 | Marina Tsianou; Ankitkumar I. Fajalia, Langmuir, 2014

Cyclodextrins (CDs) are known to bind surfactant molecules below the surfactant critical micelle concentration (CMC); however, interactions of CDs with surfactant micelles (above the CMC) are not well understood. In particular, direct structural evidence of the location of CDs in the different ...


Microcontact Imprinting of Algae for Biofuel Systems: The Effects of the Polymer Concentration

13-11-2014 | Mei-Hwa Lee; James L. Thomas; Ming-Yuan Lai; Ching-Ping Shih; Hung-Yin Lin, Langmuir, 2014

Microcontact imprinting of cells often involves the deposition of a polymer solution onto a monolayer cell stamp, followed by solvent evaporation. Thus, the concentration of the polymer may play an important role in the final morphology and efficacy of the imprinted film. In this work, various ...


Admittance Detector for High Impedance Systems: Design and Applications

13-11-2014 | Min Zhang; Brian N. Stamos; Purnendu K. Dasgupta, Analytical Chemistry, 2014

We describe an admittance detector for high impedance systems (small capillary bore and/or low solution specific conductance). Operation in the low frequency range (≤1 kHz, much lower than most relevant publications) provides optimum response to conductance changes in capillaries ≤20 μm in bore. ...


Core-Liquid-Induced Transition from Coaxial Electrospray to Electrospinning of Low-Viscosity Poly(lactide-co-glycolide) Sheath Solution

12-11-2014 | C. J. Luo; M. Edirisinghe, Macromolecules, 2014

Co-electrospinning has demonstrated that polymer solutions below the entanglement concentration can be made into fibers as an encapsulated core in an electrospinnable sheath solution containing a carrier/template polymer. The carrier polymer may require removal at a later stage. This work shows ...


Understanding the Selective Etching of Electrodeposited ZnO Nanorods

12-11-2014 | Benoit N. Illy; Bridget Ingham; Michael F. Toney; Iris Nandhakumar; Mary P. Ryan, Langmuir, 2014

ZnO nanotubes were prepared by selective dissolution of electrodeposited nanorods. The effect of solution pH, rod morphology, and chloride ion concentration on the dissolution mechanism was studied. The selective etching was rationalized in terms of the surface energy of the different ZnO crystal ...


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