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Search for "quantum dots" in Full Text gives 211 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

Nanoparticle shapes by using Wulff constructions and first-principles calculations

  • Georgios D. Barmparis,
  • Zbigniew Lodziana,
  • Nuria Lopez and
  • Ioannis N. Remediakis

Beilstein J. Nanotechnol. 2015, 6, 361–368, doi:10.3762/bjnano.6.35

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  • implementations are Wulffman [19] and VESTA [20]. Among the first uses of the Wulff construction for the characterization of nanoparticles are experiments by H. Topsøe and co-workers for Cu-based catalysts [21][22], and the theory of Müller and Kern for epitaxially strained semiconductor quantum dots [23]. Since
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Published 03 Feb 2015

Comparative evaluation of the impact on endothelial cells induced by different nanoparticle structures and functionalization

  • Lisa Landgraf,
  • Ines Müller,
  • Peter Ernst,
  • Miriam Schäfer,
  • Christina Rosman,
  • Isabel Schick,
  • Oskar Köhler,
  • Hartmut Oehring,
  • Vladimir V. Breus,
  • Thomas Basché,
  • Carsten Sönnichsen,
  • Wolfgang Tremel and
  • Ingrid Hilger

Beilstein J. Nanotechnol. 2015, 6, 300–312, doi:10.3762/bjnano.6.28

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  • nanoparticles on endothelial cells. Our findings will help to design new nanoparticles with optimized properties concerning biocompatibility and uptake behavior with respect to the respective intended application. Keywords: cell viability; gold nanoparticles; internalization; Janus particles; quantum dots
  • . Colloidal semiconductor nanocrystals or quantum dots (QDs) with their outstanding fluorescence properties also play a distinct role in life science. QDs exhibit high stability against photo bleaching and they are easily tunable in color. Several studies demonstrated their feasibility for detection of
  • Fe3O4) and quantum dots (QDs). 1) Gold nanoparticles (GNP): The gold colloids with a core size of approximately 40 nm in diameter were synthesized according to Rosman et al. [45] and were spherically or rod-like shaped. GNP without surface functionalization were transferred to 0.1 M
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Published 27 Jan 2015

The effect of surface charge on nonspecific uptake and cytotoxicity of CdSe/ZnS core/shell quantum dots

  • Vladimir V. Breus,
  • Anna Pietuch,
  • Marco Tarantola,
  • Thomas Basché and
  • Andreas Janshoff

Beilstein J. Nanotechnol. 2015, 6, 281–292, doi:10.3762/bjnano.6.26

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  • -particle tracking), was shown to compromise the integrity of the cytoskeletal and plasma membrane dynamics, as evidenced by electric cell–substrate impedance sensing. Keywords: biocompatibility; CdSe/ZnS; cytotoxicity; ECIS; quantum dots; single-particle tracking; Introduction Quantum dots (QDs) are
  • core synthesis The synthesis of the CdSe core of the quantum dots and the ZnS shell followed a modified prescription from Mahler et al. [47] The Se injection solution was prepared by heating 64 mg of Se, 4 mL of trioctylphosphine, 1.5 mL of oleylamine and 1 g of tetradecylphosphonic acid under argon
  • -Planck-Institute for Dynamics and Self-Organization (MPIDS), Laboratory for Fluid Dynamics, Pattern Formation and Biocomplexity, Am Fassberg 17, 37077 Goettingen, Germany 10.3762/bjnano.6.26 Abstract In this work, cytotoxicity and cellular impedance response was compared for CdSe/ZnS core/shell quantum
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Published 26 Jan 2015

Overview about the localization of nanoparticles in tissue and cellular context by different imaging techniques

  • Anja Ostrowski,
  • Daniel Nordmeyer,
  • Alexander Boreham,
  • Cornelia Holzhausen,
  • Lars Mundhenk,
  • Christina Graf,
  • Martina C. Meinke,
  • Annika Vogt,
  • Sabrina Hadam,
  • Jürgen Lademann,
  • Eckart Rühl,
  • Ulrike Alexiev and
  • Achim D. Gruber

Beilstein J. Nanotechnol. 2015, 6, 263–280, doi:10.3762/bjnano.6.25

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  • ]. In this regard, the increased brightness and photostability of a fluorescent dye when incorporated into the core of SiO2-NP are particularly welcome [83]. Of note, some specifically engineered NP may hold inherent fluorescent properties, such as inorganic quantum dots (QD) [76]. QD used in
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Published 23 Jan 2015

Tailoring the ligand shell for the control of cellular uptake and optical properties of nanocrystals

  • Johannes Ostermann,
  • Christian Schmidtke,
  • Christopher Wolter,
  • Jan-Philip Merkl,
  • Hauke Kloust and
  • Horst Weller

Beilstein J. Nanotechnol. 2015, 6, 232–242, doi:10.3762/bjnano.6.22

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  • and specificity in a broad in vitro test is demonstrated. Keywords: biolable; cellular uptake; fluorescence quenching; poylmeric micelles; quantum dots; Introduction One of the main challenges in using high quality nanoparticles for biological applications is to ensure that the ligand system
  • has shown to drastically enhance the fluorescence properties, namely the fluorescence quantum efficiency, of encapsulated CdSe/CdS/ZnS and CdSe/CdxZn(1-x)S/ZnS core–shell–shell quantum dots (QDs). This enhancement can be explained to a certain extent by the cross-linking of the micelles but further
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Published 21 Jan 2015

Caveolin-1 and CDC42 mediated endocytosis of silica-coated iron oxide nanoparticles in HeLa cells

  • Nils Bohmer and
  • Andreas Jordan

Beilstein J. Nanotechnol. 2015, 6, 167–176, doi:10.3762/bjnano.6.16

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  • was chosen as a model cell line. Hela cells are a well-established malignant cell line, which was widely used to study the uptake of iron oxide nanoparticles [18][21][24][32], gold nanoparticles [33][34] and other particle systems like quantum dots [35] or polymer particles [36][37]. To gain insights
  • human alveolar epithelial cells and polystyrene nanoparticles around 100 nm [38] as well as polymer coated gold nanoparticles with a core size around 13 nm [39]. On the other hand there are studies showing the uptake of different nanoparticles by HeLa cells such as quantum dots [35], PEG-PLA particles
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Published 14 Jan 2015

The distribution and degradation of radiolabeled superparamagnetic iron oxide nanoparticles and quantum dots in mice

  • Denise Bargheer,
  • Artur Giemsa,
  • Barbara Freund,
  • Markus Heine,
  • Christian Waurisch,
  • Gordon M. Stachowski,
  • Stephen G. Hickey,
  • Alexander Eychmüller,
  • Jörg Heeren and
  • Peter Nielsen

Beilstein J. Nanotechnol. 2015, 6, 111–123, doi:10.3762/bjnano.6.11

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  • , Germany Institute of Physical Chemistry and Electrochemistry, Technical University of Dresden, Bergstr. 66b, 01069 Dresden, Germany 10.3762/bjnano.6.11 Abstract 51Cr-labeled, superparamagnetic, iron oxide nanoparticles (51Cr-SPIOs) and 65Zn-labeled CdSe/CdS/ZnS-quantum dots (65Zn-Qdots) were prepared
  • /CdS/ZnS-Qdots in the liver. Keywords: biodistribution; chromium(III); 51Cr; quantum dots; SPIOs; zinc metabolism; 65Zn; Introduction Quantum dots (Qdots) are semiconductor nanocrystals (2–100 nm in diameter) that combine a strong, size-tunable photoluminescence with robust photostability, which
  • the iron oxide core of SPIOs under similar experimental conditions was unsuccessful. However, a distinct incorporation of 65ZnCl2 occurred when CdSe/CdS/ZnS core/shell/shell quantum dots were synthesized (Figure 1). Both hydrophobic nanoparticle cores were encapsulated using the same polymer to render
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Published 09 Jan 2015

Synthesis of boron nitride nanotubes and their applications

  • Saban Kalay,
  • Zehra Yilmaz,
  • Ozlem Sen,
  • Melis Emanet,
  • Emine Kazanc and
  • Mustafa Çulha

Beilstein J. Nanotechnol. 2015, 6, 84–102, doi:10.3762/bjnano.6.9

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  • amino groups and its use as a good dispersion agent [79]. The BNNTs were first coated with PLL and then with quantum dots (QDs) to observe the cellular uptake of PLL–BNNTs in C2C12 mouse myoblast cells. To observe the energy dependence of the uptake mechanism of the PLL–BNNTs, sodium azide was used to
  • carriers of boron atoms. Figure 9 shows how the BNNTs were functionalized with PLL, a fluorescent probe (quantum dots) and folic acids. PLLs were wrapped around the BNNTs to induce a hydrophilic property. In addition, the BNNTs were coated with folic acids for selective interaction with the tumor cells
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Published 08 Jan 2015

The fate of a designed protein corona on nanoparticles in vitro and in vivo

  • Denise Bargheer,
  • Julius Nielsen,
  • Gabriella Gébel,
  • Markus Heine,
  • Sunhild C. Salmen,
  • Roland Stauber,
  • Horst Weller,
  • Joerg Heeren and
  • Peter Nielsen

Beilstein J. Nanotechnol. 2015, 6, 36–46, doi:10.3762/bjnano.6.5

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  • resulted in a more neutral particle (B), reaction with PEG-bisamine in an even cationic particle (C) as seen in electrophoresis (left Quantum dots, right SPIOs with the same polymer-coating and the same pegylation). Modification of the EDC concentration resulted in gradually PEGylated products, which can
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Published 06 Jan 2015

Nanoparticle interactions with live cells: Quantitative fluorescence microscopy of nanoparticle size effects

  • Li Shang,
  • Karin Nienhaus,
  • Xiue Jiang,
  • Linxiao Yang,
  • Katharina Landfester,
  • Volker Mailänder,
  • Thomas Simmet and
  • G. Ulrich Nienhaus

Beilstein J. Nanotechnol. 2014, 5, 2388–2397, doi:10.3762/bjnano.5.248

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  • with widely differing sizes. We have selected very small gold nanoclusters (AuNCs, diameter ≈3 nm) stabilized with dihydrolipoic acid (DHLA), semiconductor core-shell quantum dots (CdSe/ZnS, ≈10 nm) coated with D-penicillamine (DPA) and relatively large polystyrene (PS) NPs (≈100 nm) with different
  • , some general conclusions are drawn as to how the NP size affects the mechanistic details of the uptake process. Results and Discussion NP characterization We have synthesized differently sized, water-soluble NPs, including intrinsically luminescent D-penicillamine-coated quantum dots (DPA-QDs) [28
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Published 11 Dec 2014

Synthesis of radioactively labelled CdSe/CdS/ZnS quantum dots for in vivo experiments

  • Gordon M. Stachowski,
  • Christoph Bauer,
  • Christian Waurisch,
  • Denise Bargheer,
  • Peter Nielsen,
  • Jörg Heeren,
  • Stephen G. Hickey and
  • Alexander Eychmüller

Beilstein J. Nanotechnol. 2014, 5, 2383–2387, doi:10.3762/bjnano.5.247

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  • nanomaterials have been developed for applications in the field of bio-labelling. For the visualization of transport processes in the body, organs and cells, luminescent quantum dots (QDs) make for highly useful diagnostic tools. However, intercellular routes, bio-distribution, metabolism during degradation or
  • phase transfer of the QDs. Keywords: biomarker; CdSe/CdS/ZnS; quantum dots; radioactive labelling; 65Zn; Introduction Two decades of research and investigation in the field of luminescent semiconductor nanoparticles, also known as quantum dots (QDs), have now passed since the fundamental work of
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Published 10 Dec 2014

Inorganic Janus particles for biomedical applications

  • Isabel Schick,
  • Steffen Lorenz,
  • Dominik Gehrig,
  • Stefan Tenzer,
  • Wiebke Storck,
  • Karl Fischer,
  • Dennis Strand,
  • Frédéric Laquai and
  • Wolfgang Tremel

Beilstein J. Nanotechnol. 2014, 5, 2346–2362, doi:10.3762/bjnano.5.244

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  • properties [16][17]. Since the 1980s [16][18][19], there has been a huge research effort in optimizing the characteristics of hetero-structured semiconductors with extraordinary optical properties. Xie et al. [13] demonstrated the design of CdSe quantum dots covered by a multishell structure from CdS and ZnS
  • yield governed by the electronic passivation of the surface, whereas the quantum yield was decreased for a shell thickness of more than two multilayers, which was attributed to lattice imperfections within the shell (Figure 2c) [13]. Recent developments in the fields of hetero-structured quantum dots
  • exploration of their physicochemical properties and large scale applications in the near future. Illustrations of the transition from isotropic to anisotropic particles. a) Evolution of the PL-peak position, b) schematic representation, and c) evolution of the PL-quantum yield for several core-shell quantum
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Published 05 Dec 2014

Advanced atomic force microscopy techniques II

  • Thilo Glatzel,
  • Ricardo Garcia and
  • Thomas Schimmel

Beilstein J. Nanotechnol. 2014, 5, 2326–2327, doi:10.3762/bjnano.5.241

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  • batteries for a comparison of their nanoscale electrical, electrochemical, and morphological properties [6] or the analysis of CdS quantum dots on TiO2 by a combination of AFM and X-ray photoelectron spectroscopy [7]. The folding and rupture of graphene on SiC analyzed by non-contact AFM and Kelvin probe
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Published 03 Dec 2014

Biopolymer colloids for controlling and templating inorganic synthesis

  • Laura C. Preiss,
  • Katharina Landfester and
  • Rafael Muñoz-Espí

Beilstein J. Nanotechnol. 2014, 5, 2129–2138, doi:10.3762/bjnano.5.222

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  • . [5] prepared chitosan/silica composite microspheres by mixing an aqueous solution of the biopolymer with commercial nanosized silica particles. The obtained microparticles were dried afterwards. In further examples, chitosan matrices have also been used to immobilize CdSe quantum dots [6] and γ-Fe2O3
  • particles were obtained (Figure 3). Analogous to the DNA case, peptidic supports have also been used for the deposition of metals [53] and semiconductor chalcogenide quantum dots [54][55][56][57][58][59][60][61][62][63][64][65]. B2. Biopolymer particles as “supports”: In the area of preparation of hollow
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Published 17 Nov 2014

Effects of surface functionalization on the adsorption of human serum albumin onto nanoparticles – a fluorescence correlation spectroscopy study

  • Pauline Maffre,
  • Stefan Brandholt,
  • Karin Nienhaus,
  • Li Shang,
  • Wolfgang J. Parak and
  • G. Ulrich Nienhaus

Beilstein J. Nanotechnol. 2014, 5, 2036–2047, doi:10.3762/bjnano.5.212

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  • Fe–Pt nanoparticles (NPs, 6 nm radius), CdSe/ZnS quantum dots (QDs, 5 nm radius) and Au and Ag nanoclusters (1–4 nm radius), which are enshrouded by various water-solubilizing surface layers exposing different chemical functional groups (carboxyl, amino and both), thereby endowing the NPs with
  • four orders of magnitude. These variations can be understood in terms of specific Coulombic interactions between the proteins and the NP surfaces. Keywords: fluorescence correlation spectroscopy; human serum albumin; nanoparticles; protein corona; quantum dots; Introduction In recent years, both
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Published 07 Nov 2014

Data-adaptive image-denoising for detecting and quantifying nanoparticle entry in mucosal tissues through intravital 2-photon microscopy

  • Torsten Bölke,
  • Lisa Krapf,
  • Regina Orzekowsky-Schroeder,
  • Tobias Vossmeyer,
  • Jelena Dimitrijevic,
  • Horst Weller,
  • Anna Schüth,
  • Antje Klinger,
  • Gereon Hüttmann and
  • Andreas Gebert

Beilstein J. Nanotechnol. 2014, 5, 2016–2025, doi:10.3762/bjnano.5.210

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  • microscopy (2PM); denoising; in vivo imaging; nanoparticles; signal to noise ratio (SNR); quantum dots; Introduction Imaging methods applied to detect fluorescent nanoparticles in mucosal tissues should provide high optical resolution and allow large volumes to be scanned. An important and versatile tool
  • /ZnS-core/shell/shell quantum dots (QDs) used in this study were provided by the Center for Applied Nanotechnology, CAN GmbH, Germany (CANdots, Series A). These nanocrystals are originally dispersed in a nonpolar organic solvent. To allow for bioapplications they were transferred into the aqueous phase
  • authors thank Dr. Jan Niehaus (CAN-GmbH, Germany) and Sören Becker (University of Hamburg, Germany) for kindly providing the quantum dots used in this study. Supported by Deutsche Forschungsgemeinschaft (GE 647/10, HU 629/4, WE 2059/8).
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Published 06 Nov 2014

Carbon nano-onions (multi-layer fullerenes): chemistry and applications

  • Juergen Bartelmess and
  • Silvia Giordani

Beilstein J. Nanotechnol. 2014, 5, 1980–1998, doi:10.3762/bjnano.5.207

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  • research on carbon nanostructures. Biological and environmental applications Biological imaging: In contrast to other carbon nanomaterials such as CNTs [52] or carbon quantum dots [53], CNOs have not been widely employed in biological marking, yet. A first report was published in 2011 by Sarkar et al. by
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Published 04 Nov 2014

Silicon and germanium nanocrystals: properties and characterization

  • Ivana Capan,
  • Alexandra Carvalho and
  • José Coutinho

Beilstein J. Nanotechnol. 2014, 5, 1787–1794, doi:10.3762/bjnano.5.189

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  • models and the more elaborate k·p perturbation theory have been used to give insight into the quantum confinement [39], dispersion, as well as on the dependence of the electronic levels of nanocrystals and quantum dots on strain and electric fields [40]. Such results are general and have been helpful to
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Published 16 Oct 2014

Controlling the optical and structural properties of ZnS–AgInS2 nanocrystals by using a photo-induced process

  • Takashi Yatsui,
  • Fumihiro Morigaki and
  • Tadashi Kawazoe

Beilstein J. Nanotechnol. 2014, 5, 1767–1773, doi:10.3762/bjnano.5.187

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  • ], quantum dots (QDs) [4], quantum wells [5], and quantum rings [6]. Kawazoe et al., have demonstrated the room-temperature operation of AND-gate and NOT-gate devices using InAs QD pairs [7]. In a nanophotonic device, near-field energy-transfer via a dipole-forbidden energy state, which is unattainable in
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Published 14 Oct 2014

Experimental techniques for the characterization of carbon nanoparticles – a brief overview

  • Wojciech Kempiński,
  • Szymon Łoś,
  • Mateusz Kempiński and
  • Damian Markowski

Beilstein J. Nanotechnol. 2014, 5, 1760–1766, doi:10.3762/bjnano.5.186

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  • as a quantum dots matrix [35][44]. In such a matrix, where CNs are structurally connected by some mechanical linkages (carbon chains or graphene fragments [34]), there exists a system of potential barriers, similar to the those formed by a dielectric separator in granular metals. The barriers depend
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Published 13 Oct 2014

Influence of surface-modified maghemite nanoparticles on in vitro survival of human stem cells

  • Michal Babič,
  • Daniel Horák,
  • Lyubov L. Lukash,
  • Tetiana A. Ruban,
  • Yurii N. Kolomiets,
  • Svitlana P. Shpylova and
  • Oksana A. Grypych

Beilstein J. Nanotechnol. 2014, 5, 1732–1737, doi:10.3762/bjnano.5.183

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  • for the above mentioned purposes [9]. Monosized iron oxide nanoparticles, sometimes called ultra-small superparamagnetic iron oxide nanoparticles, play the dominant role. Quantum dots, gold and, recently, also upconversion nanoparticles are used less frequently. The main advantages of iron oxides
  • (magnetite Fe3O4 or maghemite γ-Fe2O3) are their simple preparation and their magnetic properties, which are necessary for detection. Moreover, it is convenient that iron oxides are readily metabolized in the body. From this point of view, quantum dots are disqualified due to their toxicity. Like in every
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Published 08 Oct 2014

Donor–acceptor graphene-based hybrid materials facilitating photo-induced electron-transfer reactions

  • Anastasios Stergiou,
  • Georgia Pagona and
  • Nikos Tagmatarchis

Beilstein J. Nanotechnol. 2014, 5, 1580–1589, doi:10.3762/bjnano.5.170

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  • materials composed of graphene and photoactive components, such as porphyrins and phthalocyanines, have been prepared and evaluated regarding photo-induced charge transfer phenomena [16][17][18]. Moreover, semiconducting quantum dots such as CdS [19][20][21][22], CdSe [23][24][25][26], CdTe [27][28], ZnO
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Published 18 Sep 2014

Synthesis of hydrophobic photoluminescent carbon nanodots by using L-tyrosine and citric acid through a thermal oxidation route

  • Venkatesh Gude

Beilstein J. Nanotechnol. 2014, 5, 1513–1522, doi:10.3762/bjnano.5.164

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  • as heterogeneous graphene quantum dots (GQDs) [15]. Many research groups developed synthetic routes to obtain CNDs without using surface passivating agents, by using natural resources like candle soot [6], orange juice [7], banana juice [16], ground soybeans [17], waste paper [18], and paper ash [19
  • structural defects [2][5][15][20]. Recently, Cushing et al. reported that the origin of excitation wavelength dependent emission, the continuous red shift and the broadening of bands is due to a “giant red-edge effect” of heterogeneous graphene quantum dots. The giant red-edge effect appears because the
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Published 11 Sep 2014

The cell-type specific uptake of polymer-coated or micelle-embedded QDs and SPIOs does not provoke an acute pro-inflammatory response in the liver

  • Markus Heine,
  • Alexander Bartelt,
  • Oliver T. Bruns,
  • Denise Bargheer,
  • Artur Giemsa,
  • Barbara Freund,
  • Ludger Scheja,
  • Christian Waurisch,
  • Alexander Eychmüller,
  • Rudolph Reimer,
  • Horst Weller,
  • Peter Nielsen and
  • Joerg Heeren

Beilstein J. Nanotechnol. 2014, 5, 1432–1440, doi:10.3762/bjnano.5.155

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  • .5.155 Abstract Semiconductor quantum dots (QD) and superparamagnetic iron oxide nanocrystals (SPIO) have exceptional physical properties that are well suited for biomedical applications in vitro and in vivo. For future applications, the direct injection of nanocrystals for imaging and therapy represents
  • : hepatocytes; inflammation; Kupffer cells; liver sinusoidal endothelial cells; nanoparticle toxicity; nanoparticle uptake; quantum dots; superparamagnetic iron-oxide nanocrystals; Introduction The superior optical properties of QDs compared to organic dyes render them promising candidates for the demands of
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Published 02 Sep 2014

Surface processes during purification of InP quantum dots

  • Natalia Mordvinova,
  • Pavel Emelin,
  • Alexander Vinokurov,
  • Sergey Dorofeev,
  • Artem Abakumov and
  • Tatiana Kuznetsova

Beilstein J. Nanotechnol. 2014, 5, 1220–1225, doi:10.3762/bjnano.5.135

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  • , B-2020 Antwerp, Belgium 10.3762/bjnano.5.135 Abstract Recently, a new simple and fast method for the synthesis of InP quantum dots by using phosphine as phosphorous precursor and myristic acid as surface stabilizer was reported. Purification after synthesis is necessary to obtain samples with good
  • precursor takes place, which leads to a better surface passivation. The electrophoretic purification technique does not increase luminescence efficiency but yields very pure quantum dots in only a few minutes. Additionally, the formation of In(OH)3 during the low temperature synthesis was explained
  • . Purification of quantum dots is a very significant part of postsynthetical treatment that determines the properties of the material. But this subject is not sufficiently discussed in the literature. The paper is devoted to the processes that occur at the surface of quantum dots during purification. A new
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Published 06 Aug 2014
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