Showing 1-30 of 38 results for "

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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...
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...
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...
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...
Enyi Ye et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 17(11), 3074-3077 (2011-02-11)
The coating makes the wire bundle: High-quality free-standing copper nanowires have been successfully produced by disproportionation of Cu(+) in oleylamine. This provides an effective way to prepare high-quality copper nanowires, but also enriches synthetic routes to other nanostructures. These copper...
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...
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...
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...
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...
The potential clinical impact of quantum dots.
Swadeshmukul Santra
Nanomedicine (London, England), 7(5), 623-626 (2012-05-29)
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...
Byoung-Ho Kang et al.
Optics express, 18(17), 18303-18311 (2010-08-20)
We propose a highly efficient hybrid light-emitting device (LED) with a single active layer where CdSe/ZnS quantum dots (QDs) are dispersed as a guest material in a conjugated polymer (co-polymer) matrix used for a host material. In our structure, the...
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...
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...
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...
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)...
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...
Zeng, Z.; et al.
European Journal of Organic Chemistry, 1615-1615 (2008)
Hong Pan et al.
ACS nano, 8(6), 5468-5477 (2014-05-07)
Highly pathogenic avian influenza A viruses are emerging pandemic threats in human beings. Monitoring the in vivo dynamics of avian influenza viruses is extremely important for understanding viral pathogenesis and developing antiviral drugs. Although a number of technologies have been...
Valentina Cauda et al.
Journal of the American Chemical Society, 133(17), 6484-6486 (2011-04-13)
We report on a novel high temperature liquid phase "calcination" method with trioctylphosphine oxide (TOPO), tri-n-octylamine (TOA), and squalene for removing the template and strengthening the silica network in colloidal mesoporous silica (CMS) nanoparticles. For such materials, the common calcination...
Niemeyer, J.; et al.
European Journal of Inorganic Chemistry, 680-680 (2010)
Wettling, T.; et al.
Ger. Offen., 1993-1993 null
Suhua Wang et al.
Nanotechnology, 20(42), 425102-425102 (2009-09-26)
Positively charged and pH self-buffering quantum dots (Tren-QDs) were achieved by surface functionalization with tris(2-aminoethyl)amine (Tren) derivatives, which are attached to the inorganic cores of QDs through bidentate chelating of dithiocarbamates. The Tren-QDs exhibit pH buffering capability by absorbing or...
Urice Tohgha et al.
Chemical communications (Cambridge, England), 49(18), 1844-1846 (2013-01-31)
Semiconductor cadmium selenide (CdSe) quantum dots (QDs) exhibited mirror-image circular dichroism (CD) spectra in the visible region (350-570 nm) after replacing the trioctylphosphine oxide/oleic acid ligands on achiral nanocrystals with D- and L-cysteines. Chiroptical properties of cysteine-capped CdSe QDs depend...
Wesley E Smith et al.
ACS nano, 6(11), 9475-9484 (2012-10-09)
Semiconductor quantum dots (Qdots) are a promising new technology with benefits in the areas of medical diagnostics and therapeutics. Qdots generally consist of a semiconductor core, capping shell, and surface coating. The semiconductor core of Qdots is often composed of...
Shuang-Yuan Zhang et al.
Advanced materials (Deerfield Beach, Fla.), 24(32), 4369-4375 (2012-07-19)
The preparation of vertically or horizontally aligned self-assemblies of CoP nanowires is demonstrated for the first time by aging them in the reaction solution for a sufficient time at 20 or 0 °C. This strategy opens up a way for...
Belyakova, Z. V.; et al
Russ. J. Gen. Chem., 80, 728-728 (2010)
Longjun Wang et al.
Steroids, 89, 41-46 (2014-08-06)
An ultrasensitive and selective method is presented for the determination of diethylstilbestrol (DES) using time-resolved fluorescence immunoassay (TRFIA) based on double-codified gold nanoparticles (DC-AuNPs). In this system, the DC-AuNPs, that are gold nanoparticles (AuNPs) modified with anti-DES antibody and SH-dsDNA-biotin...
Supratim Giri et al.
Chemical communications (Cambridge, England), 47(14), 4195-4197 (2011-03-04)
A simple one-step flow focusing method was used to embed both magnetic nanoparticles and quantum dots in microbeads in controlled ratios to generate a large library of molecular barcodes for biological applications.
Iván Castelló Serrano et al.
Nanoscale, 6(22), 13623-13629 (2014-10-03)
We present herein two colour encoded silica nanospheres (2nanoSi) for the fluorescence quantitative ratiometric determination of trypsin in humans. Current detection methods for cystic fibrosis diagnosis are slow, costly and suffer from false positives. The 2nanoSi proved to be a...