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Mohammad Outokesh et al.
Journal of microencapsulation, 28(4), 248-257 (2011-05-07)
A novel microcapsule adsorbent for separation of uranium from phosphoric acid solutions was developed by immobilizing the di(2-ethylhexyl) phosphoric acid-trioctyl phosphine oxide extractants in the polymeric matrix of calcium alginate. Physical characterization of the microcapsules was accomplished by scanning electron...
Miguel Álvaro-Benito et al.
Journal of immunology (Baltimore, Md. : 1950), 194(2), 803-816 (2014-12-17)
During the adaptive immune response, MHCII proteins display antigenic peptides on the cell surface of APCs for CD4(+) T cell surveillance. HLA-DM, a nonclassical MHCII protein, acts as a peptide exchange catalyst for MHCII, editing the peptide repertoire. Although they...
Jiyoun Lee et al.
Environmental toxicology, 25(6), 593-600 (2009-07-04)
With an increasing use of quantum dots (QDs) in many applications, their potential hazard is of growing concern. However, little is known about their ecotoxicity, especially in vivo. In the present study, we employed freshwater macroinvertebrate, Daphnia magna, to evaluate...
Stefano Vezzoli et al.
ACS nano, 9(8), 7992-8003 (2015-07-28)
We present a method that allows determining the band-edge exciton fine structure of CdSe/CdS dot-in-rods samples based on single particle polarization measurements at room temperature. We model the measured emission polarization of such single particles considering the fine structure properties...
Sang Cheol Lee
Bioresource technology, 192, 340-345 (2015-06-10)
Selective removal of acetic acid from simulated hemicellulosic hydrolysates containing xylose and sulfuric acid was attempted in a batch emulsion liquid membrane (ELM) system with organophosphorus extractants. Various experimental variables were used to develop a more energy-efficient ELM process. Total...
Noah J Orfield et al.
ACS nano, 12(5), 4206-4217 (2018-05-02)
Quantum dots (QDs) are steadily being implemented as down-conversion phosphors in market-ready display products to enhance color rendering, brightness, and energy efficiency. However, for adequate longevity, QDs must be encased in a protective barrier that separates them from ambient oxygen...
Ji-Tao Song et al.
Dalton transactions (Cambridge, England : 2003), 44(25), 11314-11320 (2015-05-27)
In this study, silica coated Au nanospheres (Au@SiO2) were prepared by a reverse microemulsion method; subsequently, a layer of fluorescent quantum dots (QDs) were adsorbed onto it and then it was coated with silica again. After modifying with PVP, the...
Matthew A Koc et al.
ACS nano, 11(2), 2075-2084 (2017-01-24)
The reabsorption of photoluminescence within a medium, an effect known as the inner filter effect (IFE), has been well studied in solutions, but has garnered less attention in regards to solid-state nanocomposites. Photoluminescence from a quantum dot (QD) can selectively...
H El-Didamony et al.
Journal of hazardous materials, 244-245, 596-602 (2012-12-01)
Phosphogypsum (PG), primary byproduct from phosphoric acid production, is accumulated in large stockpiles and occupies vast areas of land. Phosphogypsum is a technologically enhanced naturally occurring radioactive material (TE-NORM) that contains radionuclides from (238)U and (232)Th decay series which are...
Sujoy Biswas et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 91, 222-227 (2012-03-03)
An extractive spectrophotometric analytical method has been developed for the determination of uranium in ore leach solution. This technique is based on the selective extraction of uranium from multielement system using a synergistic mixture of 2-ethylhexyl phosphonic acid-mono-2-ethylhexyl ester (PC88A)...
Fengjia Fan et al.
Nature, 544(7648), 75-79 (2017-03-23)
Colloidal quantum dots (CQDs) feature a low degeneracy of electronic states at the band edges compared with the corresponding bulk material, as well as a narrow emission linewidth. Unfortunately for potential laser applications, this degeneracy is incompletely lifted in the...
Chloé Grazon et al.
Nature communications, 11(1), 1276-1276 (2020-03-11)
Bacteria are an enormous and largely untapped reservoir of biosensing proteins. We describe an approach to identify and isolate bacterial allosteric transcription factors (aTFs) that recognize a target analyte and to develop these TFs into biosensor devices. Our approach utilizes...
Aditya Sharma et al.
Analytical chemistry, 84(7), 3082-3089 (2012-03-03)
We present results of the studies relating to preparation of Langmuir-Blodgett (LB) monolayers of tri-n-octylphosphine oxide-capped cadmium selenide quantum dots (QCdSe) onto indium-tin oxide (ITO) coated glass substrate. The monolayer behavior has been studied at the air-water interface under various...
Dahin Kim et al.
ACS nano, 11(12), 12461-12472 (2017-11-14)
To capitalize on shape- and structure-dependent properties of semiconductor nanorods (NRs), high-precision control and exquisite design of their growth are desired. Cadmium chalcogenide (CdE; E = S or Se) NRs are the most studied class of such, whose growth exhibits...
Freddy T Rabouw et al.
ACS nano, 9(10), 10366-10376 (2015-09-22)
Conventional colloidal quantum dots (QDs) suffer from rapid energy losses by nonradiative (Auger) processes, leading to sub-ns lifetimes in all excited states but the lowest-energy single exciton. Suppression of interband Auger decay, such as biexciton Auger recombination, has been achieved...
Finn Purcell-Milton et al.
ACS nano, 11(9), 9207-9214 (2017-08-19)
Core/shell quantum dots (QDs) are of high scientific and technological importance as these nanomaterials have found a number of valuable applications. In this paper, we have investigated the dependence of optical activity and photoluminescence upon CdS shell thickness in a...
Yong Tao et al.
Journal of chromatography. A, 1216(35), 6259-6266 (2009-07-28)
By using ionic liquid as membrane liquid and tri-n-octylphosphine oxide (TOPO) as additive, hollow fiber supported liquid phase microextraction (HF-LPME) was developed for the determination of five sulfonamides in environmental water samples by high-performance liquid chromatography with ultraviolet detection The...
Jungkon Kim et al.
Aquatic toxicology (Amsterdam, Netherlands), 97(2), 116-124 (2010-01-20)
The potential ecotoxicological consequences about semiconductor crystal nanoparticles (NPs) are a growing concern. However, our understanding of the mechanism of toxicity in NPs is very limited, especially under varying environmental conditions such as ultraviolet (UV) light. We performed an in...
Lisa A McConnachie et al.
Nanotoxicology, 7(2), 181-191 (2012-01-24)
Because of their unique optical properties, quantum dots (QDs) have become a preferred system for ultrasensitive detection and imaging. However, since QDs commonly contain Cd and other heavy metals, concerns have been raised regarding their toxicity. QDs are thus commonly...
Harikrishna Bavireddi et al.
The Analyst, 137(21), 5123-5127 (2012-09-25)
Highly fluorescent water soluble glyco-quantum dots were synthesized using a sonochemical procedure. The synthetic approach is based on specific host-guest interactions between β-cyclodextrin (β-CD) and trioctylphosphine oxide (TOPO) surfactant on quantum dots. The modified QDs were analyzed by a combination...
Sangheon Lee et al.
Scientific reports, 5, 17472-17472 (2015-12-08)
Semiconductor sensitized solar cells, a promising candidate for next-generation photovoltaics, have seen notable progress using 0-D quantum dots as light harvesting materials. Integration of higher-dimensional nanostructures and their multi-composition variants into sensitized solar cells is, however, still not fully investigated...
M Vibin et al.
Journal of fluorescence, 21(4), 1365-1370 (2011-01-12)
Trioctylphosphine oxide capped cadmium selenide quantum dots, synthesized in organic media were rendered water soluble by silica overcoating. Silanisation was done by a simple reverse microemulsion method using aminopropyl silane as the silica precursor. Further, the strong photoluminescence of the...
Sean W Depner et al.
ACS nano, 8(5), 4678-4688 (2014-04-23)
We demonstrate that the degree of branching of the alkyl (R) chain in a Hf(OR)4 precursor allows for control over the length of HfO2 nanocrystals grown by homocondensation of the metal alkoxide with a metal halide. An extended nonhydrolytic sol-gel...
Jiaji Cheng et al.
ACS nano (2018-05-24)
Ligand-induced chirality in semiconductor nanocrystals (NCs) has attracted attention because of the tunable optical properties of the NCs. Induced circular dichroism (CD) has been observed in CdX (X = S, Se, Te) NCs and their hybrids, but circularly polarized luminescence...
Sotirios Christodoulou et al.
Nature communications, 6, 7905-7905 (2015-07-30)
Strain in colloidal heteronanocrystals with non-centrosymmetric lattices presents a unique opportunity for controlling optoelectronic properties and adds a new degree of freedom to existing wavefunction engineering and doping paradigms. We synthesized wurtzite CdSe nanorods embedded in a thick CdS shell...
Min Xie et al.
Nanotechnology, 23(3), 035602-035602 (2011-12-17)
Bead-based optical encoding or magnetic encoding techniques are promising in high-throughput multiplexed detection and separation of numerous species under complicated conditions. Therefore, a self-assembly strategy implemented in an organic solvent is put forward to fabricate fluorescent-magnetic dual-encoded nanospheres. Briefly, hydrophobic...
The potential clinical impact of quantum dots.
Swadeshmukul Santra
Nanomedicine (London, England), 7(5), 623-626 (2012-05-29)
Avichai Marcovici et al.
ACS nano, 12(10), 10016-10023 (2018-09-27)
Controlled assembly of nanostructures is a key challenge in nanotechnology. In this work, we introduce an approach for the controlled assembly of 1D nanodumbbells-Au-tipped semiconductor nanorods-into arbitrary 2D higher architectures, by their chemical docking to nanopatterned functionalities. We realized the...
M Vibin et al.
Biological trace element research, 142(2), 213-222 (2010-07-21)
Recently, quantum dots derived from trace elements like cadmium and selenium have attracted widespread interest in biology and medicine. They are rapidly being used as novel tools for both diagnostic and therapeutic purposes. In this report, we evaluated the distribution...
Anastasiia Smirnova et al.
Physical chemistry chemical physics : PCCP, 22(26), 14992-14997 (2020-07-01)
Radiolytic stability is one of the main requirements of the substances that are used in the chemistry of nuclear cycle or in the radiopharmaceutical chemistry. Herein, we proposed an approach for the prediction of radiolytic stability by the estimation of...
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