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Search for "surfactant" in Full Text gives 218 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

Photo-ignition process of multiwall carbon nanotubes and ferrocene by continuous wave Xe lamp illumination

  • Paolo Visconti,
  • Patrizio Primiceri,
  • Daniele Longo,
  • Luciano Strafella,
  • Paolo Carlucci,
  • Mauro Lomascolo,
  • Arianna Cretì and
  • Giuseppe Mele

Beilstein J. Nanotechnol. 2017, 8, 134–144, doi:10.3762/bjnano.8.14

Graphical Abstract
  • /ferrocene mixture in toluene, before the treatment (c), after ten minutes of sonication and other ten minutes of magnetic stirring (d) and after another sonication for ten minutes (e). MWCNT/ferrocene mixture after adding SDS surfactant. Absorption spectra of MWCNT/ferrocene soon after sonication and
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Published 13 Jan 2017

Sensitive detection of hydrocarbon gases using electrochemically Pd-modified ZnO chemiresistors

  • Elena Dilonardo,
  • Michele Penza,
  • Marco Alvisi,
  • Gennaro Cassano,
  • Cinzia Di Franco,
  • Francesco Palmisano,
  • Luisa Torsi and
  • Nicola Cioffi

Beilstein J. Nanotechnol. 2017, 8, 82–90, doi:10.3762/bjnano.8.9

Graphical Abstract
  • amount of palladium deposited on ZnO was about 1.0 atom %. The TOAB surfactant was almost completely removed from the Pd surface after annealing. In Figure 3, the SEM images of pristine and Pd-functionalized ZnO NRs after thermal annealing at 550 °C are reported. Pristine and functionalized ZnO reveal a
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Published 10 Jan 2017

Structural and tribometric characterization of biomimetically inspired synthetic "insect adhesives"

  • Matthias W. Speidel,
  • Malte Kleemeier,
  • Andreas Hartwig,
  • Klaus Rischka,
  • Angelika Ellermann,
  • Rolf Daniels and
  • Oliver Betz

Beilstein J. Nanotechnol. 2017, 8, 45–63, doi:10.3762/bjnano.8.6

Graphical Abstract
  • (C30) representing hydrocarbons of defined structure and length within the range of C23–C49 as established in the biological role models. Albumin and gelatin were substitutes for proteinogenic amino acids, with the surfactant Span 80 (Sorbitane monooleate) being used as a combined replacement for fatty
  • , standard deviation (Supporting Information File 1, Table S1)) showed a positive statistical correlation to the chemical compounds Vaseline, glycerine and SDS (sodium dodecyl sulfate), occurring mostly within the first generation of emulsions. The non-ionic surfactant Span 80 and the ionic surfactant AOT
  • , microcrystalline wax, poly(vinyl alcohol) (only at the highest sliding speed of 500 µm s−1), glycerine, gelatin and sodium dodecyl sulphate (SDS) showed a positive significant relationship with friction. In addition, friction was also negatively affected by the non-ionic surfactant Span 80 at an almost significant
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Published 06 Jan 2017

From iron coordination compounds to metal oxide nanoparticles

  • Mihail Iacob,
  • Carmen Racles,
  • Codrin Tugui,
  • George Stiubianu,
  • Adrian Bele,
  • Liviu Sacarescu,
  • Daniel Timpu and
  • Maria Cazacu

Beilstein J. Nanotechnol. 2016, 7, 2074–2087, doi:10.3762/bjnano.7.198

Graphical Abstract
  •  3d). The core–shell morphology is visible in Figure 3c, with an inorganic core covered by the surfactant. Nanoparticle samples (NPT4) were obtained starting from a FeAc2 ([Fe3O(CH3COO)6(H2O)3]NO3∙4H2O) cluster. TEM observations (Figure 4) revealed particles in the form of spheres with hair-like
  • NPT1b. Both samples were redispersed in hexane and ethanol and then centrifuged to remove excess surfactant. NPT2–NPT4 nanoparticles were prepared using a procedure similar to that described for NPT1a, but using the reagents amounts, reaction time and temperature indicated in Table 1. Preparation of
  • precipitated with ethanol and were then centrifuged. To remove excess surfactant, the washing procedure with ethanol and centrifugation were repeated three times. Dry thermal decomposition (calcination) (NPC series). Samples NPC1, NPC2 and NPC3 were prepared by heating of FeAc2, FeCrF and FePAZ, respectively
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Published 28 Dec 2016

Effect of Anderson localization on light emission from gold nanoparticle aggregates

  • Mohamed H. Abdellatif,
  • Marco Salerno,
  • Gaser N. Abdelrasoul,
  • Ioannis Liakos,
  • Alice Scarpellini,
  • Sergio Marras and
  • Alberto Diaspro

Beilstein J. Nanotechnol. 2016, 7, 2013–2022, doi:10.3762/bjnano.7.192

Graphical Abstract
  • shows a peak at ≈521 nm which is much sharper (FWHM ≈40 nm) than both cases of quartz and glass substrate. This confirms that the surfactant in the colloidal solution prevents the AuNPs from aggregating [8]. The theoretical simulation of the absorption of the spherical AuNPs is finally shown in Figure
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Published 16 Dec 2016

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

Graphical Abstract
  • fabricating polymer nanocomposites [20][21][22][23]. To favor the dispersion of LDH platelets into polymers, hybrid surfactant (usually dodecyl sulphate)-intercalated LDH were prepared and incorporated into polymer matrices such as polyethylene [24], polypropylene [25], poly(methyl methacrylate) [26
  • ], elastomers [27], epoxy polymers [28], poly(ε-caprolactone) [29], polyesters [30], polyurethane [31] and polyimide [21]. Alternatively, Leroux et al. described the preparation of a hybrid LDH phase intercalated by an anionic polymerizable surfactant acting further as an anchor that compatibilizes the
  • inorganic LDH with the polymer matrix during the polymerization [32]. Water soluble macromolecules such as poly(vinyl alcohol), poly(acrylic acid) (PAA), poly(styrene sulfonate) were also intercalated into the layered structure to avoid the use of surfactant molecules which can alter nanocomposite
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Published 15 Dec 2016

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

Graphical Abstract
  • the PL detection towards the nanotube diameters. The energy diagram shown at the right-hand side of Figure 2a represents a two-component system consisting of the anionic surfactant SDBS and the SWNTs in water, where the anionic surfactant forms micelles around the nanotubes having typical exciton
  • between the surfactant (at premicellar and micellar concentrations) and the dye. Referring to our previous studies on the interaction of SDBS and astraphloxin (a polymethine dye with cyanines at both terminal groups) resulting in the aggregation of the dye. There is no such behaviour in the case of DOB
  • -719. In addition, we have studied the three-component system of DOB-719, SDBS, and SWNTs, where an extra amount of surfactant was added (see Supporting Information File 1, Figures S3–S5) to obtain a concentration of SDBS above the critical micellar concentration of 0.15 mg/mL [22]. The three-component
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Published 14 Dec 2016

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

Graphical Abstract
  • tetraethoxysilane (TEOS) and tetramethoxysilane (TMOS) although this methodology may involve the use of other alkoxysilanes as well as diverse metal alkoxides [14]. The influence of the surfactant incorporated into the organoclay on the characteristics of the obtained materials has been pointed out recently [15][16
  • ]. The methodology has been also applied to organoclays derived from fibrous clays (e.g., sepiolite) in which the presence of the surfactant at the external surface results in the formation of silica NP of diverse characteristics depending on the nature of both, silane precursor and surfactant present at
  • and sepiolite fibrous clay, in which SiO2-clay organoheterostructures are used for further assembling ZnO NP. In this way, heterostructures in which the surfactant is still present are formed from TMOS and organoclays derived from two types of silicates (smectites and sepiolite) and then the formed
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Published 12 Dec 2016

In situ formation of reduced graphene oxide structures in ceria by combined sol–gel and solvothermal processing

  • Jingxia Yang,
  • Johannes Ofner,
  • Bernhard Lendl and
  • Ulrich Schubert

Beilstein J. Nanotechnol. 2016, 7, 1815–1821, doi:10.3762/bjnano.7.174

Graphical Abstract
  • mmol) was dissolved in 1,2-dimethoxyethane (10 mL), followed by the addition of acetaldoxime (10 mmol) and stirring for 30 min, addition of the surfactant F127 (0.025 mmol) and additionally stirring for 1 h. No water was added during this stage. Different proportions of GO (0–0.2 g) were then added
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Published 23 Nov 2016

Effective intercalation of zein into Na-montmorillonite: role of the protein components and use of the developed biointerfaces

  • Ana C. S. Alcântara,
  • Margarita Darder,
  • Pilar Aranda and
  • Eduardo Ruiz-Hitzky

Beilstein J. Nanotechnol. 2016, 7, 1772–1782, doi:10.3762/bjnano.7.170

Graphical Abstract
  • examples, organoclays containing alkylammonium surfactant species [20][22] or polyethylene glycol as plasticizer [21] were required to produce the zein-based materials. Nevertheless, the process of formation of zein–montmorillonite biohybrids making use of sodium-exchanged montmorillonite (Na
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Published 18 Nov 2016

Viability and proliferation of endothelial cells upon exposure to GaN nanoparticles

  • Tudor Braniste,
  • Ion Tiginyanu,
  • Tibor Horvath,
  • Simion Raevschi,
  • Serghei Cebotari,
  • Marco Lux,
  • Axel Haverich and
  • Andres Hilfiker

Beilstein J. Nanotechnol. 2016, 7, 1330–1337, doi:10.3762/bjnano.7.124

Graphical Abstract
  • cell function. Many studies have tried treating endothelial cells with peptide-coated nanoparticles, with the final outcome dependent upon the surfactant bound to the nanoparticle rather than the nanoparticle itself [11][12]. We propose the use of “smart materials” for such purposes. GaN could be a
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Published 23 Sep 2016

Fabrication and characterization of branched carbon nanostructures

  • Sharali Malik,
  • Yoshihiro Nemoto,
  • Hongxuan Guo,
  • Katsuhiko Ariga and
  • Jonathan P. Hill

Beilstein J. Nanotechnol. 2016, 7, 1260–1266, doi:10.3762/bjnano.7.116

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  • air, which removes amorphous impurities and etches/oxidizes the MWCNTs at defect sites without damaging the sidewalls [31]. In many nanocarbon material applications the presence of residual surfactant or organic residues can be a problem, but this is not the case here. The experimental procedure
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Published 05 Sep 2016

Mesoporous hollow carbon spheres for lithium–sulfur batteries: distribution of sulfur and electrochemical performance

  • Anika C. Juhl,
  • Artur Schneider,
  • Boris Ufer,
  • Torsten Brezesinski,
  • Jürgen Janek and
  • Michael Fröba

Beilstein J. Nanotechnol. 2016, 7, 1229–1240, doi:10.3762/bjnano.7.114

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  • another 18 h at room temperature, the suspension was neutralized with hydrochloric acid (32%) to precipitate the core–shell particles. The precipitate was centrifuged and dried at 60 °C before removing the surfactant by calcination at 550 °C for 6 h in air. Synthesis of hollow carbon spheres The synthesis
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Published 30 Aug 2016

Tunable longitudinal modes in extended silver nanoparticle assemblies

  • Serene S. Bayram,
  • Klas Lindfors and
  • Amy Szuchmacher Blum

Beilstein J. Nanotechnol. 2016, 7, 1219–1228, doi:10.3762/bjnano.7.113

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  • for larger-scale synthesis due to technical limitations. Other attempts such as assembling on templates of λ-DNA networks have not demonstrated the ability to generate discrete plasmonic modes, and, since they are substrate-based, lack the versatility of tuning the plasmonic bands [24]. Surfactant
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Published 26 Aug 2016

Reasons and remedies for the agglomeration of multilayered graphene and carbon nanotubes in polymers

  • Rasheed Atif and
  • Fawad Inam

Beilstein J. Nanotechnol. 2016, 7, 1174–1196, doi:10.3762/bjnano.7.109

Graphical Abstract
  • mechanical stirring, to disentangle the nano-filler followed by the enclosure of dispersed nano-filler in a polymer matrix or a surfactant complex. This enclosure hinders the re-aggregation and yields a metastable dispersion. Or the nano-filler is disentangled by dispersion in a suitable solvent. In the case
  • surfactant solution. The reactions involved are carried out in argon atmosphere [117]. A typical disorder band in Raman spectrum gives proof of the sidewall functionalization. This sidewall functionalization not only improves purity and solubility, but it also changes the physical properties. In fact, the
  • driving force for the formation of aggregates. The CNT dispersion can be enhanced by non-ionic surfactants in case of water-soluble polymers [40]. Both ionic and non-ionic aqueous surfactant solutions can be used to disperse the CNT in low concentrations. Examples of surfactants include sodium
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Published 12 Aug 2016

An ellipsometric approach towards the description of inhomogeneous polymer-based Langmuir layers

  • Falko O. Rottke,
  • Burkhard Schulz,
  • Klaus Richau,
  • Karl Kratz and
  • Andreas Lendlein

Beilstein J. Nanotechnol. 2016, 7, 1156–1165, doi:10.3762/bjnano.7.107

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  • will observe lateral movement for almost every surfactant film. This movement originates from thermal and/or surface pressure gradients or even from air draft. This movement does not significantly hinder the recording of a fully focused IE or BAM image, which takes about one second; whereas it takes
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Published 08 Aug 2016

Photocurrent generation in carbon nanotube/cubic-phase HfO2 nanoparticle hybrid nanocomposites

  • Protima Rauwel,
  • Augustinas Galeckas,
  • Martin Salumaa,
  • Frédérique Ducroquet and
  • Erwan Rauwel

Beilstein J. Nanotechnol. 2016, 7, 1075–1085, doi:10.3762/bjnano.7.101

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  • reaction by-products typical of nonaqueous sol–gel routes using precursors that do not contain hydrate species. Here, the amine species capping acts not only as a surfactant but also as a shape and size controlling agent during growth of the NP. Since our MWCNTs were not acid treated, the particles are
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Published 26 Jul 2016

Synthesis of cobalt nanowires in aqueous solution under an external magnetic field

  • Xiaoyu Li,
  • Lijuan Sun,
  • Hu Wang,
  • Kenan Xie,
  • Qin Long,
  • Xuefei Lai and
  • Li Liao

Beilstein J. Nanotechnol. 2016, 7, 990–994, doi:10.3762/bjnano.7.91

Graphical Abstract
  • pressures, cobalt nanowires were synthesized by chemical reduction in aqueous solution with the assistance of polyvinylpyrrolidone (PVP) as surfactant under moderate conditions for the first time, while an external magnetic field of 40 mT was applied. Uniform linear cobalt nanowires with relatively smooth
  • . Keywords: aqueous solution; cobalt nanowires; external magnetic field; magnetic properties; surfactant; Findings In recent years, cobalt nanowires, as a ferromagnetic material, have attracted considerable attention due to their outstanding magnetic properties and excellent performance in applications in
  • preparing cobalt nanowires in aqueous solution up to now [13]. In our previous studies, we have successfully prepared nickel and nickel/copper nanowires [14][15][16], and cobalt nanowires were synthesized using NaBH4 as initiator without surfactant in ethylene glycol solution with an external magnetic field
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Published 07 Jul 2016

Reconstitution of the membrane protein OmpF into biomimetic block copolymer–phospholipid hybrid membranes

  • Matthias Bieligmeyer,
  • Franjo Artukovic,
  • Stephan Nussberger,
  • Thomas Hirth,
  • Thomas Schiestel and
  • Michaela Müller

Beilstein J. Nanotechnol. 2016, 7, 881–892, doi:10.3762/bjnano.7.80

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  • (0.01% w/v) is below its cmc value and a channel-like structure, formed by the surfactant is very unlikely. Current fluctuations through single and multiple channels were recorded in voltage-clamp mode using an Axon Axopatch 200B amplifier (Molecular Devices, Sunnyvale, USA) with a capacitive headstage
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Published 21 Jun 2016

The role of morphology and coupling of gold nanoparticles in optical breakdown during picosecond pulse exposures

  • Yevgeniy R. Davletshin and
  • J. Carl Kumaradas

Beilstein J. Nanotechnol. 2016, 7, 869–880, doi:10.3762/bjnano.7.79

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  • account for separation by surfactant or coupling molecules on the particles surface while still keeping a strong plasmonic coupling effect [43]. The 3D geometry was reduced to one quarter of the full geometry (see Figure 1) by utilizing symmetry planes and absorbing boundary conditions. PEC and PMC
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Published 16 Jun 2016

Direct formation of gold nanorods on surfaces using polymer-immobilised gold seeds

  • Majid K. Abyaneh,
  • Pietro Parisse and
  • Loredana Casalis

Beilstein J. Nanotechnol. 2016, 7, 809–816, doi:10.3762/bjnano.7.72

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  • “seed solution” containing small gold nanoparticles is added to a “growth solution” in which particles grow by slow diffusion of gold atoms onto the surface of the seeds to form GNRs. The growth solution contains Au(III) ions, a reducing agent and a surfactant. Many efforts also have been made to align
  • size and preferred growth planes of {111}. On the other hand, it is proposed [40] that cetyltrimethylammonium bromide (CTAB), used as a surfactant in this work, has a preferential binding to specific side faces of gold particles, slowing down the nucleation on these side planes and allowing growth of
  • -reduction procedure without using any surfactant, capping agent or reducing agent in the solid form. Fabrication of Au–PMMA nanocomposites using UV irradiation has been reported previously in [30]. Briefly, PMMA with two different molecular weights, Mw, was chosen (P1 with Mw = 120 kDa, d = 1.188 and P2
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Published 06 Jun 2016

Assembling semiconducting molecules by covalent attachment to a lamellar crystalline polymer substrate

  • Rainhard Machatschek,
  • Patrick Ortmann,
  • Renate Reiter,
  • Stefan Mecking and
  • Günter Reiter

Beilstein J. Nanotechnol. 2016, 7, 784–798, doi:10.3762/bjnano.7.70

Graphical Abstract
  • process [7][11], we refrained from adding surfactants as we wanted to avoid to have surfactant molecules included in the monolayers transferred onto a solid substrate. Accordingly, we spread CPE45 nanocrystals from a 1:1 methanol–water dispersion onto a water surface at pH 11. After Langmuir–Schäfer
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Published 02 Jun 2016

Magnetic switching of nanoscale antidot lattices

  • Ulf Wiedwald,
  • Joachim Gräfe,
  • Kristof M. Lebecki,
  • Maxim Skripnik,
  • Felix Haering,
  • Gisela Schütz,
  • Paul Ziemann,
  • Eberhard Goering and
  • Ulrich Nowak

Beilstein J. Nanotechnol. 2016, 7, 733–750, doi:10.3762/bjnano.7.65

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Published 24 May 2016

Tight junction between endothelial cells: the interaction between nanoparticles and blood vessels

  • Yue Zhang and
  • Wan-Xi Yang

Beilstein J. Nanotechnol. 2016, 7, 675–684, doi:10.3762/bjnano.7.60

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  • equilibrium molecular dynamics simulations [84]. An experimental investigation showed a positive correlation between the concentration of Cu nanoparticles and the viscosity of viscoelastic surfactant solutions [85]. Interestingly, viscoelastic nanofluids containing multiwalled carbon nanotubes also showed non
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Published 06 May 2016

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

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  • process of FeCl2 and FeCl3. Using an adsorptive process the vesicles structure was incorporated with super-paramagnetic iron oxide nanoparticles [7]. Additionally, the molecular deposition of silica from water was carried out [8]. Silica-coated unilamellar surfactant vesicles were prepared by hydrolysis
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Published 02 May 2016
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