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

α-((4-Cyanobenzoyl)oxy)-ω-methyl poly(ethylene glycol): a new stabilizer for silver nanoparticles

  • Jana Lutze,
  • Miguel A. Bañares,
  • Marcos Pita,
  • Andrea Haase,
  • Andreas Luch and
  • Andreas Taubert

Beilstein J. Nanotechnol. 2017, 8, 627–635, doi:10.3762/bjnano.8.67

Graphical Abstract
  • function of the pH value both for the free stabilizer and for the polymers bound to the surface of the silver nanoparticles using 1H NMR spectroscopy and zeta potential measurements. The polymer shows a high stability between pH 3 and 9. At pH 12 and higher the polymer coating is degraded over time
  • removed from the heating bath for DLS and zeta-potential measurements. Analytical methods Gel permeation chromatography. GPC measurements were done on two 300 × 8 mm2 PSS-GRAM (7 µm particles) columns with porosities of 102–103 Å in N-methyl-2-pyrrolidone (NMP + 0.5 wt % LiBr at 70 °C and a flow rate of
  • synthesis, that is, no dilution or other sample processing was performed prior to Raman analysis. NMR spectroscopy. 1H NMR spectra were recorded on a Bruker Avance 300 MHz or 500 MHz spectrometer in D2O with TMS as an internal standard. Light scattering and zeta potential. The hydrodynamic diameter Rh and
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Published 15 Mar 2017

Uptake of the proteins HTRA1 and HTRA2 by cells mediated by calcium phosphate nanoparticles

  • Olga Rotan,
  • Katharina N. Severin,
  • Simon Pöpsel,
  • Alexander Peetsch,
  • Melisa Merdanovic,
  • Michael Ehrmann and
  • Matthias Epple

Beilstein J. Nanotechnol. 2017, 8, 381–393, doi:10.3762/bjnano.8.40

Graphical Abstract
  • temperature. Analytical methods Dynamic light scattering (DLS) and zeta potential determinations were performed with a Zetasizer Nano series instrument (Malvern Nano-ZS, laser: λ = 532 nm) using the Smoluchowski approximation and taking the data from the Malvern software without further correction. The
  • (Table 2). All nanoparticles had a hydrodynamic diameter between 250 and 350 nm. The zeta potential reflects the corresponding charge of the polyelectrolyte polymer used for the stabilization (CMC: negative charge, PEI: positive charge) that indicates the colloidal stability of the nanoparticles in
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Published 07 Feb 2017

Comparison of four methods for the biofunctionalization of gold nanorods by the introduction of sulfhydryl groups to antibodies

  • Xuefeng Wang,
  • Zhong Mei,
  • Yanyan Wang and
  • Liang Tang

Beilstein J. Nanotechnol. 2017, 8, 372–380, doi:10.3762/bjnano.8.39

Graphical Abstract
  • treatment induced a 5 nm red shift after the binding of anti-IgG. Moreover, the nanorods showed no aggregation as can be deduced from the lack of peak broadening and alteration of the spectra for all samples. Table S1 (Supporting Information File 1) presents a summary of the change in the zeta potential of
  • the GNR surfaces after binding of anti-IgG. The four modified anti-IgG all induced a decrease in zeta potential after conjugation. This is consistent with previously reported observations that GNR surface potentials decrease after bioconjugation from highly positive surface charges packed with CTAB, a
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Published 06 Feb 2017

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

Graphical Abstract
  • only little with increasing concentration (Table S2, Supporting Information File 1). The zeta potential of 2h particles is about −30 ± 1 mV (Figure S5, Supporting Information File 1). The increase in temperature up to 50 °С is shown to result in the breaking of the particles of the short-chain
  • about 1 and about 200 nm in diameter (Figure 6b). The former most likely correspond to SDS micelles, while the latter represent mixed structures of SDS and the isoindigo derivative. In the SDS–2a system an increase in zeta potential is observed (Figure 6c). According to our results and literature data
  • [77][78], the zeta potential of SDS micelles is about −70 mV, while the mixed aggregates of SDS and 2a have a zeta potential of about −110 mV. In the case of compound 3, there is a decrease in the zeta potential of SDS micelles by ca. 20 mV. Most probably, 2a molecules are incorporated and dissolved
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Published 01 Feb 2017

Template-controlled piezoactivity of ZnO thin films grown via a bioinspired approach

  • Nina J. Blumenstein,
  • Fabian Streb,
  • Stefan Walheim,
  • Thomas Schimmel,
  • Zaklina Burghard and
  • Joachim Bill

Beilstein J. Nanotechnol. 2017, 8, 296–303, doi:10.3762/bjnano.8.32

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  • zeta potential of SAMs with COOH- and SO3H-functional groups in dependence on the pH [40]. They found that the sulfonate SAM is more negatively charged (−115 mV) compared to the carboxylate one (−75 mV) at a pH of 9, which corresponds to the pH of the mineralization solution used in this study. This
  • ions as can be seen from the pKa values reported by Rived et al. [43]. Therefore, it is probable that the surface charge of the used templates is lower in methanol than it could be expected from zeta potential measurements in water. Nevertheless, the polarity of the two templates is high enough to
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Published 30 Jan 2017

Comparison of four functionalization methods of gold nanoparticles for enhancing the enzyme-linked immunosorbent assay (ELISA)

  • Paula Ciaurriz,
  • Fátima Fernández,
  • Edurne Tellechea,
  • Jose F. Moran and
  • Aaron C. Asensio

Beilstein J. Nanotechnol. 2017, 8, 244–253, doi:10.3762/bjnano.8.27

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  • maintained until the flask reached room temperature. AuNPs and conjugates were characterized by dynamic light scattering (DLS) using a zeta potential analysis system (Zetasizer Nano Z, Malvern Instrumentd, Worcestershire, UK), field emission scanning electron microscope (Carl Zeiss) and UV–vis
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Published 25 Jan 2017

Performance of colloidal CdS sensitized solar cells with ZnO nanorods/nanoparticles

  • Anurag Roy,
  • Partha Pratim Das,
  • Mukta Tathavadekar,
  • Sumita Das and
  • Parukuttyamma Sujatha Devi

Beilstein J. Nanotechnol. 2017, 8, 210–221, doi:10.3762/bjnano.8.23

Graphical Abstract
  • (150 W) as an excitation source with a bandpass of 5 nm at room temperature. The fluorescence quantum yield of the colloidal CdS solution was measured on the steady state fluorometer using an additional integrating sphere [32]. Zeta potential measurements were carried out on a Horiba Nanoparticle
  • temperature. This is an indication of the ratio of the number of fluorescence quanta to the number of absorbed quanta which is directly proportional to the fluorescence lifetime. Zeta potential (ζ) measurements were also carried out to verify the stability of the CdS NPs in ethanol. A zeta potential value of
  • . Photovoltaic parameters of colloidal CdS-sensitized ZnO solar cells. Reported performance of CdS-sensitized ZnO-based solar cells. Supporting Information Supporting Information File 26: Additional Experimental Information. Quantitative EDAX spectrum and zeta potential measurement of synthesized colloidal CdS
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Published 23 Jan 2017

Streptavidin-coated gold nanoparticles: critical role of oligonucleotides on stability and fractal aggregation

  • Roberta D'Agata,
  • Pasquale Palladino and
  • Giuseppe Spoto

Beilstein J. Nanotechnol. 2017, 8, 1–11, doi:10.3762/bjnano.8.1

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  • spectroscopic, dynamic light scattering (DLS), zeta-potential (ζ), transmission electron microscopy (TEM) and SPR investigations of ODN-functionalized SA-mediated AuNPs are here presented with the aim to provide fundamental information useful to improve performances of biosensing assays using SA-mediated AuNPs
  • spectra shown in Figure 4A (left axis) and by SPR data shown in Figure 6C (right axis), respectively. Extinction spectra (400–800 nm) of AuNP-SA in the presence of free biotin (1.28 mM) titrated with unbiotinylated DNA (solutions: 100 nM, 200 nM and 400 nM, respectively). Data from TEM, DLS and zeta
  • potential characterization of nanoparticles (mean ± SD; n = 6 samples × 3 replicate). 0.1 nM nanoparticle dispersion in H2O. Acknowledgements We acknowledge support from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 633937, project ULTRAPLACAD.
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Published 02 Jan 2017

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

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  • polydispersity index, (in the 100 μg/mL colloidal solution of O-dots, the hydrodynamic diameter was about 300 ± 200 nm), and negative zeta-potential (in the range of pH 5.0…9.0, ζ = −31…−35 mV, see Supporting Information File 1, Figure S16). Such behaviour resembles the properties of surfactants that are prone
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Published 02 Dec 2016

Chitosan-based nanoparticles for improved anticancer efficacy and bioavailability of mifepristone

  • Huijuan Zhang,
  • Fuqiang Wu,
  • Yazhen Li,
  • Xiping Yang,
  • Jiamei Huang,
  • Tingting Lv,
  • Yingying Zhang,
  • Jianzhong Chen,
  • Haijun Chen,
  • Yu Gao,
  • Guannan Liu and
  • Lee Jia

Beilstein J. Nanotechnol. 2016, 7, 1861–1870, doi:10.3762/bjnano.7.178

Graphical Abstract
  • (Miniflex II, Rigaku, Japan). The X-ray source was Cu Kα radiation (30 kV, 15 mA). AFM images were obtained on a Multimode 8 AFM series (Bruker, USA) in tapping/AC mode. The mean particle size and zeta potential of the MCNs were determined by dynamic light scattering using a Nanotrac® Wave Particle Size and
  • Zeta Potential Analyzer (Microtrac Inc, Montgomeryville, PA). Encapsulation efficiency (EE) and drug loading (DL) capacity The EE and the DL of MIF in the MCNs was analyzed by high performance liquid chromatography (HPLC). Briefly, an accurately weighed quantity of the MCN powder was suspended in a
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Published 28 Nov 2016

Hydrophilic silver nanoparticles with tunable optical properties: application for the detection of heavy metals in water

  • Paolo Prosposito,
  • Federico Mochi,
  • Erica Ciotta,
  • Mauro Casalboni,
  • Fabio De Matteis,
  • Iole Venditti,
  • Laura Fontana,
  • Giovanna Testa and
  • Ilaria Fratoddi

Beilstein J. Nanotechnol. 2016, 7, 1654–1661, doi:10.3762/bjnano.7.157

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  • ), zeta potential (ζ-potential) measurements and scanning tunneling microscopy (STM). Further, to demonstrate the environmental application of our AgNPs, we also applied them for heavy metal sensing by detecting visible color modification due to SPR spectral changes. We found that these negatively charged
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Published 09 Nov 2016

Antitumor magnetic hyperthermia induced by RGD-functionalized Fe3O4 nanoparticles, in an experimental model of colorectal liver metastases

  • Oihane K. Arriortua,
  • Eneko Garaio,
  • Borja Herrero de la Parte,
  • Maite Insausti,
  • Luis Lezama,
  • Fernando Plazaola,
  • Jose Angel García,
  • Jesús M. Aizpurua,
  • Maialen Sagartzazu,
  • Mireia Irazola,
  • Nestor Etxebarria,
  • Ignacio García-Alonso,
  • Alberto Saiz-López and
  • José Javier Echevarria-Uraga

Beilstein J. Nanotechnol. 2016, 7, 1532–1542, doi:10.3762/bjnano.7.147

Graphical Abstract
  • hydrodynamic size for Fe3O4@PMAO_RGD (in a 1:10 PBS/H2O solution) nanoparticles increased until the particles reached a diameter of 111 nm. The zeta potential value at 24 h confirms the high stability of the aqueous solutions of Fe3O4@PMAO (−41 mV), but the stability decreases until −15 mV when RGD is adhered
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Published 28 Oct 2016

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

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  • Analyst 100 spectrophotometer. The microwave used was a Prolabo Synthewave. A Varian SpectrAA 55 AAS was used to detect potential traces of iron in the supernatants after collecting nanoparticles. Zeta potential measurements were determined by DLS analysis using a Malvern Zetasizer nanoZS model
  • synthesis, the coating of maghemite and a characterization of the physicochemical properties of the material [20][22]. As illustrated in Figure 1, PEIP can be customized to contain more or less phosphonated groups, by varying the percentage of amines modified (P%). Between pH 3 and 10, the zeta potential is
  • positive but decreases with the percentage of phosphonation (see Figure S2 in Supporting Information File 1). After the point of zero charge (PZC), the phosphonates induce a negative charge, whereas non-phosphonated PEI-NP display a zeta potential of 0 mV, making PEI-NP unstable at basic pH. The efficiency
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Published 13 Oct 2016

Straightforward and robust synthesis of monodisperse surface-functionalized gold nanoclusters

  • Silvia Varela-Aramburu,
  • Richard Wirth,
  • Chian-Hui Lai,
  • Guillermo Orts-Gil and
  • Peter H. Seeberger

Beilstein J. Nanotechnol. 2016, 7, 1278–1283, doi:10.3762/bjnano.7.118

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  • indicated by the zeta potential (Figure S7, Supporting Information File 1). To better understand the role of the stabilizing agent used to prepare Glc-NCs, XPS was employed (Figure S8, Supporting Information File 1). The gold core of the nanoclusters (confirmed by the Au 4f scan) is stabilized through an Au
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Published 08 Sep 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

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Published 12 Aug 2016

Multiwalled carbon nanotube hybrids as MRI contrast agents

  • Nikodem Kuźnik and
  • Mateusz M. Tomczyk

Beilstein J. Nanotechnol. 2016, 7, 1086–1103, doi:10.3762/bjnano.7.102

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  • organic functional groups of the L3 ligand. In order to assess the charge of species, zeta potential measurements were performed and turned out to be a very informative tool for covering the nanotubes with polyelectrolytes, e.g., a step-by-step analysis gave a slightly negative zeta potential SPIO/oMWCNT
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Review
Published 27 Jul 2016

Antibacterial activity of silver nanoparticles obtained by pulsed laser ablation in pure water and in chloride solution

  • Brunella Perito,
  • Emilia Giorgetti,
  • Paolo Marsili and
  • Maurizio Muniz-Miranda

Beilstein J. Nanotechnol. 2016, 7, 465–473, doi:10.3762/bjnano.7.40

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  • obtained by laser ablation [32]. In order to study the long-term colloidal stability and the electrical characteristics of the NP surface, the zeta potential was measured. The obtained values are reported in Table 1. Apart from the AgNPsLiClps sample, all samples exhibited a bimodal distribution of the
  • zeta potential. In all cases, the zeta potential is strongly negative, indicating excellent long-term stability of the NPs, as already assessed by Giorgetti et al. [32]. Furthermore, as expected, the adsorption of chloride ions shifts the zeta potential of the samples obtained in LiCl solution towards
  • more negative values. The negative zeta potential of the colloids obtained in water is due to the adsorption of hydroxide anions from the aqueous medium, whereas for the colloids obtained in LiCl solution it is due to the preferential adsorption of chloride anions on the silver surface [35]. We have
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Published 18 Mar 2016

Surface coating affects behavior of metallic nanoparticles in a biological environment

  • Darija Domazet Jurašin,
  • Marija Ćurlin,
  • Ivona Capjak,
  • Tea Crnković,
  • Marija Lovrić,
  • Michal Babič,
  • Daniel Horák,
  • Ivana Vinković Vrček and
  • Srećko Gajović

Beilstein J. Nanotechnol. 2016, 7, 246–262, doi:10.3762/bjnano.7.23

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  • bars are 100 nm. Zeta-potential (ζ) values of differently coated silver (AgNPs) and superparamagnetic iron oxide nanoparticles (SPIONs) in ultrapure water (UW), biological medium (BM) and biological medium supplemented with 0.1% bovine serum albumin (BMP) after 1 h at 25 °C. Coating agents: trisodium
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Published 15 Feb 2016

Chemical bath deposition of textured and compact zinc oxide thin films on vinyl-terminated polystyrene brushes

  • Nina J. Blumenstein,
  • Caroline G. Hofmeister,
  • Peter Lindemann,
  • Cheng Huang,
  • Johannes Baier,
  • Andreas Leineweber,
  • Stefan Walheim,
  • Christof Wöll,
  • Thomas Schimmel and
  • Joachim Bill

Beilstein J. Nanotechnol. 2016, 7, 102–110, doi:10.3762/bjnano.7.12

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  • static contact angle of Milli-Q water on the modified and unmodified samples were measured on a Contact Angle Measurement System G10 from Kruess. The results are an average of at least five measurements. Zeta-potential measurements Measurements of the ζ-potential were performed on a SurPASS
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Published 25 Jan 2016

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

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  • ), and zeta potential. PLGA nanoparticles were (249 ± 4) nm in diameter, showing a narrow size distribution (PDI 0.04 ± 0.02) and a zeta potential of (−53 ± 1) mV. After adsorption of the initial layer of polyethylenimine (PEI), the particles were washed as described in the Experimental section. The
  • obtained PLGA–PEI nanoparticles showed only a minor increase in particle diameter (266 ± 4) nm and no significant increase in PDI (0.07 ± 0.03), which indicates no aggregation of nanoparticles taking place during adsorption or washing. The zeta potential was inverted to a positive value of (+35 ± 4) mV
  • (degree of ionization ≈30%), and pH 7 (degree of ionization ≈ 80%), respectively. PAA adsorption was successful in all cases, which can be concluded from the inversion of the zeta potential from positive to negative values (Table 1). As shown in Table 1, an obvious trend comparing the zeta potential after
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Published 30 Dec 2015

Chemiresistive/SERS dual sensor based on densely packed gold nanoparticles

  • Sanda Boca,
  • Cosmin Leordean,
  • Simion Astilean and
  • Cosmin Farcau

Beilstein J. Nanotechnol. 2015, 6, 2498–2503, doi:10.3762/bjnano.6.259

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  • : for FA-capped nanoparticles (21 nm) the obtained hydrodynamic diameter was larger than for bare colloidal nanoparticles (18 nm) (Figure S2, Supporting Information File 1). Zeta potential measurements of the concentrated suspension show an average value of ζ = −32 mV, which prove a good electrostatic
  • . Particle morphology was determined by transmission electron microscopy (TEM) using a JEOL JEM1010 microscope. Zeta potential and hydrodynamic diameter of the particles were determined by using a Zetasizer Nano-ZS90 (Malvern Instruments). SERS spectra were recorded with a confocal Raman microscope (Witec
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Published 29 Dec 2015

Ultrastructural changes in methicillin-resistant Staphylococcus aureus induced by positively charged silver nanoparticles

  • Dulce G. Romero-Urbina,
  • Humberto H. Lara,
  • J. Jesús Velázquez-Salazar,
  • M. Josefina Arellano-Jiménez,
  • Eduardo Larios,
  • Anand Srinivasan,
  • Jose L. Lopez-Ribot and
  • Miguel José Yacamán

Beilstein J. Nanotechnol. 2015, 6, 2396–2405, doi:10.3762/bjnano.6.246

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  • of AgNP species is referred to as the third species, and it is central to the study of the bactericidal and ultrastructural effects of AgNPs against methicillin-sensitive Staphylococcus aureus (MSSA) and MRSA. By acquiring zeta potential measurements before and after the filtration of Ag colloids
  • spectroscopy (EDS), along with calculating the MIC50 inhibitions of AgNPs on MRSA and MSSA as well as zeta potential measurements to investigate the charged-particle nature of silver nanoparticles. The study revealed that our 1 nm average sized AgNPs induced pore formation, cell wall thinning, cell content
  • ). The measured distribution was log–normal distributed with a size distribution range of 0.5 to 24 nm and average size of 1 nm (Figure 1b). Zeta potential measurements The zeta potential value increased with time from −2.9 mV to +13.4 mV over a 120 h time period (Figure 2). This shift to positive zeta
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Published 15 Dec 2015

Green and energy-efficient methods for the production of metallic nanoparticles

  • Mitra Naghdi,
  • Mehrdad Taheran,
  • Satinder K. Brar,
  • M. Verma,
  • R. Y. Surampalli and
  • J. R. Valero

Beilstein J. Nanotechnol. 2015, 6, 2354–2376, doi:10.3762/bjnano.6.243

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  • ionic surfactants can reduce the zeta potential of Ag NPs from −20 to −50 mV, which is favorable for stabilization. They concluded that non-ionic surfactants can form a layer with inhibition function to prevent the formation of other nuclei and consequently lead to monodisperse NPs [100]. Lu et al
  • showed SPR centered at 404 nm with average particle size measured to fall within the range of 13 nm. Their FTIR study admitted the role of sulfate groups of polysaccharide in reduction of AgNO3. Also, the zeta potential measurement (−35.05 mV) confirmed the capping of anionic polysaccharide on the
  • , 6, 24 and 48 h, respectively. According to the measured zeta potential of 54.5 mV, they concluded that the synthesized Ag NPs had acceptable stability [4]. In another study, they studied the antibacterial activity of different sizes of Ag NPs against two different bacteria and observed that Ag NPs
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Published 10 Dec 2015

Fabrication of hybrid graphene oxide/polyelectrolyte capsules by means of layer-by-layer assembly on erythrocyte cell templates

  • Joseba Irigoyen,
  • Nikolaos Politakos,
  • Eleftheria Diamanti,
  • Elena Rojas,
  • Marco Marradi,
  • Raquel Ledezma,
  • Layza Arizmendi,
  • J. Alberto Rodríguez,
  • Ronald F. Ziolo and
  • Sergio E. Moya

Beilstein J. Nanotechnol. 2015, 6, 2310–2318, doi:10.3762/bjnano.6.237

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  • polyallylamine hydrochloride (PAH) and polystyrenesulfonate sodium salt (PSS). Capsules where characterized by transmission electron microscopy (TEM), atomic force microscopy (AFM), dynamic light scattering (DLS) and Raman microscopy, the constituent layers by zeta potential and GO by TEM, XRD, and Raman and
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Published 04 Dec 2015

Electroviscous effect on fluid drag in a microchannel with large zeta potential

  • Dalei Jing and
  • Bharat Bhushan

Beilstein J. Nanotechnol. 2015, 6, 2207–2216, doi:10.3762/bjnano.6.226

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  • . Nevertheless, the study on the combined effect of EDL with large zeta potential up to several hundred millivolts and surface charge depenedent-slip on the micro/nano flow is still needed. In this paper, the nonlinear Poisson–Boltzmann equation for electrical potential and ion distribution in non-overlapping
  • potential on the pressure-driven flow in a microchannel with no-slip and charge-dependent slip conditions. The results show that the EDL leads to an increase in the fluid drag, but that slip can reduce the fluid drag. When the zeta potential is large enough, the electroviscous effect disappears for flow in
  • the microchannel under a no-slip condition. However, the retardation of EDL on the flow and the enhancement of slip on the flow counteract each other under a slip condition. The underlying mechanisms of the effect of EDL with large zeta potential on fluid drag are the high net ionic concentration near
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Published 24 Nov 2015
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