XPS and NEXAFS studies of aliphatic and aromatic amine species on functionalized surfaces

Graf, Nora; Yeğen, Eda; Groß, Thomas; Lippitz, Andreas; Weigel, Wilfried; Krakert, Simone; Terfort, Andreas; Unger, Wolfgang

doi:10.1016/j.susc.2009.07.029

Cited by 391 publications

(385 citation statements)

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“…Note that the N/Si ratio for all coatings is approximately 1.0 as expected for the APS precursor. The O/Si and O/N ratios (Table 5) confirm [55,60] 23 AE 2 2 2AE 2 2 3 AE 2 C1 285.0 AE 0.2 C-C/C-R (H) [55,60] 31 AE 2 3 7AE 2 2 5 AE 2 C2 286.0 AE 0.2 C-N [55,60] 13 AE 2 2 1AE 2…”

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confidence: 68%

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Adhesion Improvement between Epoxy and Stainless Steel Using a Silane Coupling Agent in an Atmospheric Plasma Process

Ponte

Ghosh

Kakaroglou

et al. 2014

Plasma Process. Polym.

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3‐Aminopropyltriethoxysilane coatings have been deposited on stainless steel (SS) samples by means of an atmospheric pressure dielectric barrier discharge as an adhesive promotion layer in epoxy resin/SS composites. A multi‐diagnostic analytical approach (FTIR, XPS) was used for the chemical characterization of the deposited coating with regard to improvement of adhesively bonded joint strength. The effect of a plasma post‐treatment after the plasma coating deposition was compared to a thermal post‐treatment. Both enhanced the siloxane networking resulting in a significant adhesion improvement. Fracture strength between SS and epoxy was increased with more than 20 MPa.

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confidence: 68%

“…C5 5N [55,60] 28 AE 2 9 AE 2 1 8 AE 2 C4 287.9 AE 0.2 C5 5O/N-C5 5O [55,60] 4 AE 1 9 AE 1 1 0 AE 1 C5 288.9 AE 0.2 C Ã OOH(R) [55,60] In addition, the plasma post treatment is promoting the formation of (protonated) amines and nitro groups (N4, N5). In either case, these results are coherent with the previous observation based on FTIR.…”

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confidence: 99%

Adhesion Improvement between Epoxy and Stainless Steel Using a Silane Coupling Agent in an Atmospheric Plasma Process

Ponte

Ghosh

Kakaroglou

et al. 2014

Plasma Process. Polym.

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“…This is in good agreement with binding energy values previously reported in the literature for elemental selenium (see Tables S1 and S2 The signal of C 1s can be fitted into three components with binding energies located at 284.8, 286.3 and 288.1 eV, corresponding to hydrocarbon chains (C x H y ), alpha-carbon (α-C) + C-N, and carboxylic acid (COOH groups), respectively [35,36]. The N 1s peak is centered at 400.1 eV and lays in the range corresponding to nitrogen containing groups (such as amine or amide groups) [17,36,37]. The O 1s signal can be fitted into two components at 531.7 and 532.9 eV, corresponding to hydroxyl (─OH) and carboxylate (─COOH) groups, respectively [38] (see Figure S1 in the SI).…”

Section: Xps Analysismentioning

confidence: 99%

Adsorption of zinc by biogenic elemental selenium nanoparticles

Jain

Jordan

Schild

et al. 2015

Chemical Engineering Journal

128

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The adsorption of Zn 2+ ions onto biogenic elemental selenium nanoparticles (BioSeNPs) was investigated. BioSeNPs were produced by reduction of selenite (SeO 3 2− ) in the presence of anaerobic granules from a full scale upflow anaerobic sludge blanket (UASB) reactor treating paper mill wastewater. The BioSeNPs have an iso-electric point at pH 3.8 at 5 mM background electrolyte concentration. X-ray photoelectron spectroscopy showed the presence of a layer of extracellular polymeric substances on the surface of BioSeNPs providing colloidal stability. Batch adsorption experiments showed that the uptake of Zn 2+ ions by BioSeNPs was fast and occurred at a pH as low as 3.9. The maximum adsorption capacity observed was 60 mg of zinc adsorbed per g of BioSeNPs. The Zn 2+ ions adsorption on the BioSeNPs was largely unaffected by the presence of Na + and Mg 2+ , but was impacted by the presence of Ca 2+ and Fe 2+ ions.

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“…The two broad peaks at higher energies in the spectrum of Gd acetate in Figure 7 both originate from σ* resonances. Peak number 5 (294 eV) can be assigned to C-C bonds (σ* C-C ) and possibly also to C-N (σ* C-N ) bonds, whereas peak number 6 (300 eV) is assigned to σ* C-O in acetate (Graf et al 2009;Hasselström et al 1998). In the nanoparticle spectrum the presence of carbonates on the nanoparticle surface partly alters the line shape and increases the intensity of the last mentioned σ* resonance, since carbonate σ* C-O transitions overlap with the corresponding transition in acetate (Stöhr 1992).…”

Section: Figurementioning

confidence: 99%

A simple polyol-free synthesis route to Gd2O3 nanoparticles for MRI applications: an experimental and theoretical study

et al. 2012

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In all kinds of gadolinium based contrast agents, the presence of free gadolinium ions have to be avoided due to the cytotoxicity. The conventional way of producing a gadolinium based contrast agent is to form a chelate, i.e. stabilizing the metal ion using a chelating agent (for example DTPA or DOTA) but recently nanoparticles is an initial step towards biocompatible and directed nanoparticles.The main focus is on a material that in the nearby future will be the core of an The experimental results are supported by theoretical modeling studies.Theoretical IR spectra of three different Gd acetate complexes are presented as well as calculated NEXAFS spectra of one of the Gd acetate complexes and an isolated acetate group. These calculations were performed to elucidate the molecular capping of the synthesized particles. 5 EXPERIMENTAL DETAILS ChemicalsAll chemicals were used as received. Gadolinium(III) acetate hydrate (SigmaAldrich, 99.9 %), tetramethylammonium hydroxide (Sigma-Aldrich, >97 % ), ethyl acetate (Fisher Scientific, 99.99 %), dimethyl sulfoxide (Merck, 99.9 %), ammonium acetate (Merck, >96%), ethanol (Kemetyl, 99.5 %). For preparation of water based solutions, Milli-Q water (ρ > 18.2 MΩ) was used. A commercial gadolinium oxide nanopowder (Aldrich, < 100 nm, 99.8 %) was used as a reference. Preparation of Gd 2 O 3 nanoparticlesThe preparation of Gd 2 O 3 nanoparticles was based on a method previously used for producing nanocrystalline ZnO (Schwartz et al. 2003). As Zn 2+ is divalent and Ethyl acetate was added and the mixture was centrifuge washed (3500 rpm) at least three times with ethyl acetate before it was diluted in deionized water. A total amount of 0.28 g ammonium acetate was added to one whole batch to increase the water solubility. Powder samples were air dried. The yield of the sample is dependent on the washing procedure. The gadolinium content after three times of centrifuge washing with ethyl acetate is roughly 60-65 % of the initial amount added in the synthesis.6 Instrumentation X-ray diffraction XRD measurements were carried out with a Philips XRD powder diffractometer using Cu Kα radiation (λ = 1.5418 Å, 40kV, 40 mA). The 2θ step-size was 0.025° and the time per step 4 s. Air dried powder samples were used in the preparation.High-resolution transmission electron microscopy TEM measurements were performed on a FEI Tecnai G 2 electron microscope operated at 200 kV. Sample preparation was done by letting 1-2 drops of Gd 2 O 3 in water dry on an amorphous carbon-covered copper grid.Dynamic light scattering DLS measurements were carried out on an ALV/DLS/SLS-5022F system from ALV-GmbH, Langen Germany, using a HeNe laser at 632.8 nm with 22 mW output power. Prior to the measurements, the samples were temperature stabilized in a thermostat bath at 22.1 °C for at least 10 minutes. The scattering angle was 90°. 15 Gd 2 O 3 samples dispersed in MilliQ water were studied in DLS, and the long term stability of the suspensions were studied by repeated measurements during a period of 6 weeks.ζ Pot...

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XPS and NEXAFS studies of aliphatic and aromatic amine species on functionalized surfaces

Cited by 391 publications

References 59 publications

Adhesion Improvement between Epoxy and Stainless Steel Using a Silane Coupling Agent in an Atmospheric Plasma Process

Adhesion Improvement between Epoxy and Stainless Steel Using a Silane Coupling Agent in an Atmospheric Plasma Process

Adsorption of zinc by biogenic elemental selenium nanoparticles

A simple polyol-free synthesis route to Gd2O3 nanoparticles for MRI applications: an experimental and theoretical study

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