Investigation of the photocatalytic efficiency of tantalum alkoxy carboxylate-derived Ta₂O₅ nanoparticles in rhodamine B removal

• Subia Ambreen,
• Mohammad Danish,
• Narendra D. Pandey and
• Ashutosh Pandey

Beilstein J. Nanotechnol. 2017, 8, 604–613, doi:10.3762/bjnano.8.65

• water resources has become a major concern. Contamination of water by organic dyes is a threat as these molecules are non-biodegradable and highly toxic. Conventional waste water treatments (to remove solids, organic matter and, sometimes, nutrients from wastewater) such as coarse screening, grit

• removal, sedimentation and filtration are not very effective in removing organic dyes. Advanced oxidation processes (AOPs) receive a lot of interest in this regard, and photocatalysis by semiconductors is the most extensively investigated AOP. Metal oxide nanoparticles (NPs), for example TiO2, ZnO, SnO2

Nanoscale isoindigo-carriers: self-assembly and tunable properties

• Tatiana N. Pashirova,
• Andrei V. Bogdanov,
• Lenar I. Musin,
• Julia K. Voronina,
• Irek R. Nizameev,
• Marsil K. Kadirov,
• Vladimir F. Mironov,
• Lucia Ya. Zakharova,
• Shamil K. Latypov and
• Oleg G. Sinyashin

Beilstein J. Nanotechnol. 2017, 8, 313–324, doi:10.3762/bjnano.8.34

• micellar structures of different types in micellar anionic surfactant solutions (sodium dodecyl sulfate) was determined. These findings are of practical importance and are of potential interest for the design of drug delivery systems and new nanomaterials. Keywords: drug delivery systems; dyes; isoindigo

• hydropohobic solutes including drugs. Furthermore, the solubilization of organic hydrophobic dyes makes it possible to detect the formation of micelles in solution [67]. In Figure 4a, the dependence of the absorbance of hydrophobic dye (Sudan I) on the concentration of isoindigo derivatives 2g and 2h is shown

• available classical anionic (SDS), cationic (CTAB) and nonionic (Tween 80) surfactants. Because isatin and isoindigo derivatives are new dyes, their extinction coefficients were determined for the first time. UV–vis absorption spectra of 2a–h and 3 in chloroform are presented in Figures S11–S18 (Supporting

Performance of natural-dye-sensitized solar cells by ZnO nanorod and nanowall enhanced photoelectrodes

• Saif Saadaoui,
• Mohamed Aziz Ben Youssef,
• Moufida Ben Karoui,
• Rached Gharbi,
• Emanuele Smecca,
• Vincenzina Strano,
• Salvo Mirabella,
• Alessandra Alberti and
• Rosaria A. Puglisi

Beilstein J. Nanotechnol. 2017, 8, 287–295, doi:10.3762/bjnano.8.31

• Dipartimento di Fisica e Astronomia, Università di Catania, via S. Sofia 64, Catania, Italy 10.3762/bjnano.8.31 Abstract In this work, two natural dyes extracted from henna and mallow plants with a maximum absorbance at 665 nm were studied and used as sensitizers in the fabrication of dye-sensitized solar

• semiconductor in DSSCs [2][3][4][5]. Besides, the TiO2 offers high electronic mobility for photogenerated electron collection, a suitable band gap, which adapts to the injection of the electrons of most studied dyes, and high surface area to enhance the dye loading by anchoring the dye [6][7]. Zinc oxide (ZnO

• complete the reaction [2][10]. Different high-raked commercial dyes, such as N719 or N3, have been widely studied in the literature and their performance has been proven. Because these organometallic dyes contain environmental pollutants, such as heavy metals [6], recent studies have focused on finding a

Photocatalysis applications of some hybrid polymeric composites incorporating TiO₂ nanoparticles and their combinations with SiO₂/Fe₂O₃

• Andreea Laura Chibac,
• Tinca Buruiana,
• Violeta Melinte and
• Emil C. Buruiana

Beilstein J. Nanotechnol. 2017, 8, 272–286, doi:10.3762/bjnano.8.30

• drugs, pesticides, dyes, and plastics. On the basis of this information, we tried to prepare stable photocatalytic materials with good activity against phenolic pollutants under UV–visible light starting from TiO2 NPs with and without Si–O–Si sequences and/or Fe2O3 NPs immobilized in a polymer network

• hybrid polymeric films in the degradation of other pollutants such as dyes (methylene blue, methyl orange, nile red) in a fashion similar to the above molecules should be tested. Conclusion Polymeric composites containing TiO2 NPs, pure or combined with Si–O–Si linkages and/or Fe2O3 NPs were prepared via

Intercalation and structural aspects of macroRAFT agents into MgAl layered double hydroxides

• Dessislava Kostadinova,
• Ana Cenacchi Pereira,
• Muriel Lansalot,
• Franck D’Agosto,
• Elodie Bourgeat-Lami,
• Fabrice Leroux,
• Christine Taviot-Guého,
• Sylvian Cadars and
• Vanessa Prevot

Beilstein J. Nanotechnol. 2016, 7, 2000–2012, doi:10.3762/bjnano.7.191

• matrices [5][6][7]. For instance, hybrid LDH involving amino acids, peptides, nucleosides, nucleic acids [8][9][10], biopolymers [11][12] and various drugs [13][14][15] were investigated to develop efficient systems for therapeutic applications [16][17]. Various dyes (sulfonated spyrospiran, methyl orange

A dioxaborine cyanine dye as a photoluminescence probe for sensing carbon nanotubes

• Mohammed Al Araimi,
• Petro Lutsyk,
• Anatoly Verbitsky,
• Yuri Piryatinski,
• Mykola Shandura and
• Aleksey Rozhin

Beilstein J. Nanotechnol. 2016, 7, 1991–1999, doi:10.3762/bjnano.7.190

• sidewall with π-conjugated organic compounds [9][10][11][12]. Considering sensors, particular attention has to be paid to the PL enhancement in aqueous media, like the complexation and resonant energy transfer (RET) from cyanine dyes to the SWNTs covered by anionic surfactants in water [12]. However, a

• emergence of new PL peaks in the range of excitation wavelength at 650–780 nm, where the PL emission of the SWNTs is very low. Generally, polymethine dyes with a terminal dioxaborine group have intense PL signals, efficient two-photon absorption, high hyperpolarizability [13], and features of effective PL

• ) via the RET. This way, DOB-719 (donor of energy) and SWNT (acceptor of energy) form nanostructured complexes via non-covalent interaction. As a result, the diagrams model the emergence of new PL peaks due to formation of non-covalent complexes of DOB-719 with the SWNT. The complexes of such dyes have

Organoclay hybrid materials as precursors of porous ZnO/silica-clay heterostructures for photocatalytic applications

• Marwa Akkari,
• Pilar Aranda,
• Abdessalem Ben Haj Amara and
• Eduardo Ruiz-Hitzky

Beilstein J. Nanotechnol. 2016, 7, 1971–1982, doi:10.3762/bjnano.7.188

• of the prepared heterostructures were characterized by diverse physico-chemical techniques (such as XRD, FTIR, TEM, FE-SEM). The efficiency of these new porous ZnO/SiO2-clay heterostructures as potential photocatalysts in the degradation of organic dyes and the removal of pharmaceutical drugs in

Controlled supramolecular structure of guanosine monophosphate in the interlayer space of layered double hydroxide

• Gyeong-Hyeon Gwak,
• Istvan Kocsis,
• Yves-Marie Legrand,
• Mihail Barboiu and
• Jae-Min Oh

Beilstein J. Nanotechnol. 2016, 7, 1928–1935, doi:10.3762/bjnano.7.184

• ability towards cationic dyes or nucleoside through noncovalent interactions. Due to its characteristic structure having K+ in the center, G4 quartets can be considered as scaffolds for artificial ion channels. We have reported a stable G4 membrane film utilizing guanosine and bis(3-aminopropyl

Facile fabrication of luminescent organic dots by thermolysis of citric acid in urea melt, and their use for cell staining and polyelectrolyte microcapsule labelling

• Nadezhda M. Zholobak,
• Anton L. Popov,
• Alexander B. Shcherbakov,
• Nelly R. Popova,
• Mykhailo M. Guzyk,
• Valeriy P. Antonovich,
• Alla V. Yegorova,
• Yuliya V. Scrypynets,
• Inna I. Leonenko,
• Alexander Ye. Baranchikov and
• Vladimir K. Ivanov

Beilstein J. Nanotechnol. 2016, 7, 1905–1917, doi:10.3762/bjnano.7.182

• crystals (quantum dots, Q-dots) are a good alternative to common fluorescent dyes in a variety of biomedical applications, mainly due to their high photostability and relatively large Stokes shift [1][2][3], but Q-dots typically contain heavy metals (lead, cadmium) and chalcogens (selenium, tellurium

• properties of low toxicity, being environmentally friendly, offering simple synthetic routes and low cost, as well as having comparable optical properties to traditional quantum dots and organic dyes [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Photoluminescent C-dots are superior in terms of

• -delivery vehicles in living beings [31][32]. Earlier, such microcapsules had been decorated using other luminescent labels, including organic dyes [33], rare-earth phosphate nanocrystals [34] and visible [35][36] or near-infrared emitting chalcogenide Q-dots [36]. Results and Discussion O-dot formation and

Role of RGO support and irradiation source on the photocatalytic activity of CdS–ZnO semiconductor nanostructures

• Suneel Kumar,
• Rahul Sharma,
• Vipul Sharma,
• Gurunarayanan Harith,
• Vaidyanathan Sivakumar and
• Venkata Krishnan

Beilstein J. Nanotechnol. 2016, 7, 1684–1697, doi:10.3762/bjnano.7.161

• of these pollutants, particularly dyes, are carcinogenic and mutagenic [2]. Thus, there is an urgent need for removal of these pollutants as these are harmful to both human and environment [3]. Previous studies have extensively explored the role of semiconductor oxides mainly ZnO, TiO2 in the

• [11], ozonization [12] and adsorption [13], as these methods are unable to remove the contaminants completely. Some recent studies have reported ZnO as a better photocatalytic material in the degradation of organic dyes in aqueous solutions, because of high charge carrier mobility and significantly

Scanning probe microscopy studies on the adsorption of selected molecular dyes on titania

• Jakub S. Prauzner-Bechcicki,
• Lukasz Zajac,
• Piotr Olszowski,
• Res Jöhr,
• Antoine Hinaut,
• Thilo Glatzel,
• Bartosz Such,
• Ernst Meyer and
• Marek Szymonski

Beilstein J. Nanotechnol. 2016, 7, 1642–1653, doi:10.3762/bjnano.7.156

• , Jagiellonian University, Łojasiewicza 11, 30-348 Krakow, Poland Department of Physics, University of Basel, Klingelbergstr. 82, 4056 Basel, Switzerland 10.3762/bjnano.7.156 Abstract Titanium dioxide, or titania, sensitized with organic dyes is a very attractive platform for photovoltaic applications. In this

• context, the knowledge of properties of the titania–sensitizer junction is essential for designing efficient devices. Consequently, studies on the adsorption of organic dyes on titania surfaces and on the influence of the adsorption geometry on the energy level alignment between the substrate and an

• charge separation and transport functions are separated. Now, the properties of the semiconductor–sensitizer junction may increase the conversion efficiency in the photovoltaic device. In view of this, it is essential to study the adsorption properties and the charge transfer of organic dyes on the

Nano- and microstructured materials for in vitro studies of the physiology of vascular cells

• Alexandra M. Greiner,
• Adria Sales,
• Hao Chen,
• Sarah A. Biela,
• Dieter Kaufmann and
• Ralf Kemkemer

Beilstein J. Nanotechnol. 2016, 7, 1620–1641, doi:10.3762/bjnano.7.155

An efficient recyclable magnetic material for the selective removal of organic pollutants

• Clément Monteil,
• Nathalie Bar,
• Agnès Bee and
• Didier Villemin

Beilstein J. Nanotechnol. 2016, 7, 1447–1453, doi:10.3762/bjnano.7.136

• Da) was purchased from BASF, phosphorous acid, formaldehyde, hydrochloric acid and sodium hydroxide were obtained from VWR and dyes (methylene blue, MB, and methyl orange, MO) from Sigma-Aldrich. Dialysis tubings were bought from Roth. Absorbance was measured by using a UV–visible Perkin-Elmer

• of the NP-PEIP in removing pollutants was determined by the adsorption of two organic dyes used as contaminants models: the positively charged (regardless of the pH value) methylene blue (MB) and the negatively charged (from pH 3.4 to basic pH) methyl orange (MO). Such dyes are pollutants themselves

• , which are considerably harder to remove, the concentration of the dyes was kept below 5·10−4 mol·L−1 in all the experiments. This choice of low concentration (which is not a strict limitation) is dictated by the need to be close to the most common pollutions that are often diffuse and characterized by

High performance Ce-doped ZnO nanorods for sunlight-driven photocatalysis

• Bilel Chouchene,
• Tahar Ben Chaabane,
• Lavinia Balan,
• Emilien Girot,
• Kevin Mozet,
• Ghouti Medjahdi and
• Raphaël Schneider

Beilstein J. Nanotechnol. 2016, 7, 1338–1349, doi:10.3762/bjnano.7.125

• been developed and their ability to degrade cyanide anions [28] or organic dyes [29][30][31][32][33] like methylene blue or methyl-orange has been demonstrated. The preparation of Ce–Cu, Ce–Pd or Ce–Ag co-doped photocatalysts to enhance the solar or the visible light catalytic response was also

Functional diversity of resilin in Arthropoda

• Jan Michels,
• Esther Appel and
• Stanislav N. Gorb

Beilstein J. Nanotechnol. 2016, 7, 1241–1259, doi:10.3762/bjnano.7.115

• by single conventional dyes. Chemical reactions with the Masson and Mallory dyes were mentioned to stain resilin red. Staining of resilin with aqueous solutions of methylene blue and toluidine blue is a common method and can provide good information about the presence and distribution of resilin

• . When resilin is stained with one of these two dyes, it does not show metachromasia. Among the amino acids that form resilin, dityrosine and trityrosine exhibit a relatively pronounced autofluorescence. This autofluorescence is present in natural resilin-containing structures and in isolated resilin

Optical absorption signature of a self-assembled dye monolayer on graphene

• Tessnim Sghaier,
• Sylvain Le Liepvre,
• Céline Fiorini,
• Ludovic Douillard and
• Fabrice Charra

Beilstein J. Nanotechnol. 2016, 7, 862–868, doi:10.3762/bjnano.7.78

• interactions between the constituent molecules, as early predicted by McRay and Kasha [2]. A well-known example is the spectral shift induced by the self-association of cyanine dyes in solution [3]. Depending on the aggregation pattern of the dyes, either bathochromically shifted J-bands or hypsochromically

• original photonic processes. An atomically precise positioning of self-associated molecular dyes can be achieved either in vacuum or at the solution–substrate interface by self-assembly techniques. In particular, perylene-3,4,9,10-tetracarboxylic-3,4,9,10-diimide (PTCDI) and its sibling molecule perylene

• -3,4,9,10-tetracarboxylic dianhydride (PTCDA), have become archetypes for photonic applications of dyes [12], for self-organized adsorption on various atomically flat surfaces [13], and for their combination. Indeed, optical differential reflectance spectroscopy [14], photoluminescence, or Raman diffraction

Gold nanoparticles covalently assembled onto vesicle structures as possible biosensing platform

• M. Fátima Barroso,
• M. Alejandra Luna,
• Juan S. Flores Tabares,
• Cristina Delerue-Matos,
• N. Mariano Correa,
• Fernando Moyano and
• Patricia G. Molina

Beilstein J. Nanotechnol. 2016, 7, 655–663, doi:10.3762/bjnano.7.58

• and condensation of silicon alkoxides into organized inorganic materials (dioctadecyldimethylammonium bromide and didodecyldimethylammonium bromide). Thus, gold nanoparticles (AuNPs) form stable complexes with hydrophobic drugs and dyes. These drugs and dyes are successfully released into cells [9

Novel roles for well-known players: from tobacco mosaic virus pests to enzymatically active assemblies

• Claudia Koch,
• Fabian J. Eber,
• Carlos Azucena,
• Alexander Förste,
• Stefan Walheim,
• Thomas Schimmel,
• Alexander M. Bittner,
• Holger Jeske,
• Hartmut Gliemann,
• Sabine Eiben,
• Fania C. Geiger and
• Christina Wege

Beilstein J. Nanotechnol. 2016, 7, 613–629, doi:10.3762/bjnano.7.54

• (length: 300 nm) in combination with functional ligands such as peptides, enzymes, dyes, drugs or inorganic materials is advantageous for applications ranging from biomedical imaging and therapy approaches over surface enlargement of battery electrodes to the immobilization of enzymes. TMV building blocks

• dyes for imaging purposes either tracing the virus itself, or targeting specific cells or organs [73][74][75][76], antigens for the development of vaccines as reviewed in great detail [77][78][79], drugs or imaging reagents for increasingly elaborated biomedical applications [80][81][82] with numerous

• , batteries, photoelectrochemical cells or environmental remediation [63][93][94][95][96][97][98][99][100][101][102][103][104][105][106][107][108][109][110][111][112][113], as scaffolds for the display of reporter dyes, nanoparticles or contrast agents such as gadolinium complexes, for light harvesting

Single-molecule mechanics of protein-labelled DNA handles

• Vivek S. Jadhav,
• Dorothea Brüggemann,
• Florian Wruck and
• Martin Hegner

Beilstein J. Nanotechnol. 2016, 7, 138–148, doi:10.3762/bjnano.7.16

• out of focus or the known blinking of fluorescing quantum dots [32] (Figure 8). This single molecule fluorescence experiment clearly visualizes the specific binding of a protein to the biotinylated end of the dsDNA. Since the dsDNA was not labelled with intercalating dyes in this fluorescence

Sonochemical co-deposition of antibacterial nanoparticles and dyes on textiles

• Ilana Perelshtein,
• Anat Lipovsky,
• Nina Perkas,
• Tzanko Tzanov and
• Aharon Gedanken

Beilstein J. Nanotechnol. 2016, 7, 1–8, doi:10.3762/bjnano.7.1

• nanoparticles on the fabric surface. It was shown that the antibacterial behavior of the metal oxides was not influenced by the presence of the dyes. Higher K/S values were achieved by sonochemical deposition of the dyes in comparison to a dip-coating (exhaustion) process. The stability of the antibacterial

• properties and the dye fastness was studied for 72 h in saline solution aiming at medical applications. Keywords: antibacterial nanoparticles; coating stability; dyes; sonochemical coating; Introduction The preferred technique for coating with nanoparticles (NPs) in most scientific and industrial examples

• process led to the partial reduction of Ag+ to metallic Ag, while AgCl was also formed due to the presence of Cl−. In the current work we describe the deposition of two different functional materials on textiles, e.g., dyes and biocidal NPs that were synthesized and embedded onto the surface from a

pH-Triggered release from surface-modified poly(lactic-co-glycolic acid) nanoparticles

• Manuel Häuser,
• Klaus Langer and
• Monika Schönhoff

Beilstein J. Nanotechnol. 2015, 6, 2504–2512, doi:10.3762/bjnano.6.260

• ultrathin polyelectrolyte multilayers (PEM) with well adjustable properties and architecture. Layer build-up is based on alternating adsorption of cationic and anionic compounds, such as polyelectrolytes [15], proteins [16], nucleic acids [17][18], dyes [19], and even colloids [14] onto the surface of

• commonly applied to detect anionic polymers [29] or dyes [30]. The obtained release data reveal valuable information about the pH-tunability of PAA in the complexed state within a polyelectrolyte multilayer. The quantification of released PDADMAC is a direct evidence of PEM decomposition and marks their

Silica-coated upconversion lanthanide nanoparticles: The effect of crystal design on morphology, structure and optical properties

• Uliana Kostiv,
• Miroslav Šlouf,
• Hana Macková,
• Alexander Zhigunov,
• Hana Engstová,
• Katarína Smolková,
• Petr Ježek and
• Daniel Horák

Beilstein J. Nanotechnol. 2015, 6, 2290–2299, doi:10.3762/bjnano.6.235

• tracking [8], bioimaging [9] and photodynamic therapy [10]. Lanthanide-doped upconversion nanoparticles emit visible light upon excitation by near-IR light (NIR). Compared with organic dyes and semiconductor quantum dots, upconversion nanoparticles have attractive chemical and optical properties, as well

Au nanoparticle-based sensor for apomorphine detection in plasma

• Chiara Zanchi,
• Andrea Lucotti,
• Matteo Tommasini,
• Sebastiano Trusso,
• Ugo de Grazia,
• Emilio Ciusani and
• Paolo M. Ossi

Beilstein J. Nanotechnol. 2015, 6, 2224–2232, doi:10.3762/bjnano.6.228

• from a straightforward SERS label (RH6G) to organic dyes of interest in art conservation (Alizarin, Purpurin) to small proteins (lysozime). These results also indicate that there is a trade-off between the size of the analyte and the average size of the inter-island channels where the analyte is pinned

A facile method for the preparation of bifunctional Mn:ZnS/ZnS/Fe₃O₄ magnetic and fluorescent nanocrystals

• Houcine Labiadh,
• Tahar Ben Chaabane,
• Romain Sibille,
• Lavinia Balan and
• Raphaël Schneider

Beilstein J. Nanotechnol. 2015, 6, 1743–1751, doi:10.3762/bjnano.6.178

• ; Introduction Semiconductor nanocrystals with a diameter of approximately 1–10 nm, also referred to as quantum dots (QDs), have attracted great attention due to their unique optical and electronic properties, which are not observed in bulk semiconductor materials [1][2][3]. Compared to conventional organic dyes

Imaging of carbon nanomembranes with helium ion microscopy

• André Beyer,
• Henning Vieker,
• Robin Klett,
• Hanno Meyer zu Theenhausen,
• Polina Angelova and
• Armin Gölzhäuser

Beilstein J. Nanotechnol. 2015, 6, 1712–1720, doi:10.3762/bjnano.6.175

• /Si wafers [12], but on other substrates, CNMs are not (or only barely) visible. In particular, it is not possible to directly image freestanding CNMs by regular optical microscopy. Indirect optical methods require the attachment of particles, fluorescent dyes [13], metallic nanostructures [14] or