Search results for: Lars Österlund

Items from 1 to 20 out of 26 results

article

Polarized and non‐polarized Raman spectroscopy of ZnO crystals: Method for determination of crystal growth and crystal plane orientation for nanomaterials

Jakob Thyr, Lars Österlund, Tomas Edvinsson

Journal of Raman Spectroscopy > 52 > 8 > 1395 - 1405

Analysis and determination of crystal orientation and exposed surface facets remain a challenge in nanomaterial science. In this work, we show that polarized and non‐polarized Raman spectroscopy can be useful tools to determine crystal plane orientation and conveniently be applied to spatial dimensions limited only by the diffraction limit of the excitation laser. The methodology is exemplified for...

article

Advanced Oxide Materials − Growth, Application, Characterization

Elżbieta Guziewicz, Albena Paskaleva, Mato Knez, Lars Österlund

physica status solidi (a) > 215 > 16 > n/a - n/a

article

Spectral Selective Solar Light Enhanced Photocatalysis: TiO₂/TiAlN Bilayer Films

Lars Österlund, Andreas Mattsson, Martin Brischetto, Joel Johansson Byberg, more

Topics in Catalysis > 2018 > 61 > 15-17 > 1607-1614

We demonstrate that spectral selective photocatalytic multilayer films can be tailored such that they can harness the full solar spectrum for enhanced photocatalytic gas-phase oxidation of acetaldehyde. Thin films of anatase TiO₂ were deposited on a thin solar absorber TiAlN film to fabricate bilayer TiO₂/TiAlN films by dc magnetron sputtering on aluminium substrates. The structural and optical properties...

article

Co-adsorption of oxygen and formic acid on rutile TiO2 (110) studied by infrared reflection-absorption spectroscopy

Andreas Mattsson, Lars Österlund

Surface Science > 2017 > 663 > C > 47-55

Adsorption of formic acid and co-adsorption with oxygen have been investigated on the rutile TiO₂(110) surface using p- and s-polarized infrared reflection-absorption spectroscopy (IRRAS) at O₂ exposures between 45 L to 8100 L and at temperatures between 273K and 343K. On the clean surface formic acid dissociates into a formate ion (formate) and a proton. Formate binds to two five-fold coordinated...

article

ZnO/spiral-shaped glass for solar photocatalytic oxidation of Reactive Red 120

Montaser Y. Ghaly, Mohamed Eid M. Ali, Lars Österlund, Ibrahim A. Khattab, more

Arabian Journal of Chemistry > 2017 > 10 > S2 > S3501-S3507

ZnO/glass spiral (GS) was prepared by immobilization of ZnO on GS with facile method, and was characterized by X-ray diffraction analysis (XRD), scanning electron microscope (SEM) and the crystallite size of ZnO on GS surface was calculated. SEM showed rod-like shape of ZnO particles on GS surface. Photocatalytic activity of prepared immobilized photocatalyst was investigated for decolourization and...

article

Fluctuation-enhanced and conductometric gas sensing with nanocrystalline NiO thin films: A comparison

Umut Cindemir, Maciej Trawka, Janusz Smulko, Claes-Göran Granqvist, more

Sensors and Actuators B: Chemical > 2017 > 242 > C > 132-139

Nanocrystalline thin films of NiO were prepared by advanced reactive gas deposition, and their responses to formaldehyde, ethanol and methane gases were studied via fluctuation-enhanced and conductometric methods Thin films with thicknesses in the 200–1700-nm range were investigated in as-deposited form and after annealing at 400 and 500°C. Morphological and structural analyses showed porous deposits...

article

Nanocrystalline diamond sensor targeted for selective CRP detection: an ATR-FTIR spectroscopy study

Per Ola Andersson, Pernilla Viberg, Pontus Forsberg, Fredrik Nikolajeff, more

Analytical and Bioanalytical Chemistry > 2016 > 408 > 14 > 3675-3680

Protein immobilization on functionalized fluorine-terminated nanocrystalline (NCD) films was studied by attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy using an immobilization protocol developed to specifically bind C-reactive protein (CRP). Using an ATR-FTIR spectroscopy method employing a force-controlled anvil-type configuration, three critical steps of the ex situ...

chapter

Nickel oxide thin film sensor for fluctuation-enhanced gas sensing of formaldehyde

Umut Cindemir, Lars Osterlund, Gunnar A. Niklasson, Claes-Goran Granqvist, more

2015 IEEE SENSORS > 1 - 4

2015 IEEE SENSORS

Nanocrystalline nickel-oxide-based thin films were prepared by advanced reactive gas deposition, and the response of these films to formaldehyde was studied by fluctuation-enhanced sensing. Morphological and structural analyses showed porous deposits of nickel oxide particles with face-centered cubic structure. Resistance fluctuations were measured upon exposure to ethanol, formaldehyde and methane...

article

Differential cellular responses in healthy mice and in mice with established airway inflammation when exposed to hematite nanoparticles

Åsa Gustafsson, Ulrika Bergström, Lina Ågren, Lars Österlund, more

Toxicology and Applied Pharmacology > 2015 > 288 > 1 > 1-11

The aim of this study was to investigate the inflammatory and immunological responses in airways and lung-draining lymph nodes (LDLNs), following lung exposure to iron oxide (hematite) nanoparticles (NPs). The responses to the hematite NPs were evaluated in both healthy non-sensitized mice, and in sensitized mice with an established allergic airway disease. The mice were exposed intratracheally to...

article

Changes in secondary structure of α-synuclein during oligomerization induced by reactive aldehydes

Yixiao Cai, Christofer Lendel, Lars Österlund, Alex Kasrayan, more

Biochemical and Biophysical Research Communications > 2015 > 464 > 1 > 336-341

The oxidative stress-related reactive aldehydes 4-hydroxy-2-nonenal (HNE) and 4-oxo-2-nonenal (ONE) have been shown to promote formation of α-synuclein oligomers in vitro. However, the changes in secondary structure of α-synuclein and the kinetics of the oligomerization process are not known and were the focus of this study. Size exclusion chromatography showed that after 1 h of incubation, HNE induced...

article

In Situ FTIR Spectroscopy Study of the Photodegradation of Acetaldehyde and azo Dye Photobleaching on Bismuth‐Modified TiO₂

Jiří Henych, Václav Štengl, Andreas Mattsson, Lars Österlund

Photochemistry and Photobiology > 91 > 1 > 48 - 58

The photocatalytic properties of bismuth‐modified titania were studied by photobleaching of two aqueous azo dyes solutions (Reactive Black 5 and Acid Orange 7), and by photoinduced decomposition (PID) of acetaldehyde using in situ FTIR spectroscopy. Low bismuth doping concentrations up to 3 at.% is shown to lead to an increased photobleaching rate of both azo dyes solutions. Too high Bi dopant concentrations...

article

Role of bismuth in nano-structured doped TiO₂ photocatalyst prepared by environmentally benign soft synthesis

Jiří Henych, Václav Štengl, Martin Kormunda, Andreas Mattsson, more

Journal of Materials Science > 2014 > 49 > 9 > 3560-3571

An environmentally benign synthesis method was used to prepare a nearly uniform dispersion of TiO₂ nanoparticles modified by bismuth for photocatalytic purposes. The role of bismuth in the catalyst structure was evaluated using numerous methods such as XRPD, HTXRPD, TEM and HRTEM, and XPS, as well as Raman, FTIR, and UV–Vis spectroscopy. The bismuth doping significantly improved the photocatalytic...

article

Large Uptake of Titania and Iron Oxide Nanoparticles in the Nucleus of Lung Epithelial Cells as Measured by Raman Imaging and Multivariate Classification

Linnea Ahlinder, Barbro Ekstrand-Hammarström, Paul Geladi, Lars Österlund

Biophysical Journal > 2013 > 105 > 2 > 310-319

It is a challenging task to characterize the biodistribution of nanoparticles in cells and tissue on a subcellular level. Conventional methods to study the interaction of nanoparticles with living cells rely on labeling techniques that either selectively stain the particles or selectively tag them with tracer molecules. In this work, Raman imaging, a label-free technique that requires no extensive...

article

Adsorption of trimethyl phosphate and triethyl phosphate on dry and water pre-covered hematite, maghemite, and goethite nanoparticles

Peter Mäkie, Per Persson, Lars Österlund

Journal of Colloid And Interface Science > 2013 > 392 > Complete > 349-358

Adsorption of trimethyl phosphate (TMP) and triethyl phosphate (TEP) on well-characterized nanoparticles of hematite (α-Fe ₂ O ₃ ), maghemite (γ-Fe ₂ O ₃ ), and goethite (α-FeOOH) has been studied by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), 2D correlation DRIFTS analysis, and X-ray photoelectron spectroscopy (XPS) on dry and water...

article

Enhancement of TiO2 behavior on photocatalytic oxidation of MO dye using TiO2/AC under visible irradiation and sunlight radiation

Tarek S. Jamil, Montaser Y. Ghaly, Nady A. Fathy, Tarek A. Abd el-halim, more

Separation and Purification Technology > 2012 > 98 > Complete > 270-279

The activated carbon loaded TiO ₂ photocatalyst was prepared and characterized by FT-IR, scanning electron micrograph (SEM) and X-ray diffraction (XRD). The photocatalytic efficiency of activated carbon loaded TiO ₂ was evaluated by photocatalytic oxidation of Methyl Orange (MO) dye in aqueous medium using visible and solar light. TiO ₂ /AC exhibited higher photocatalytic oxidation...

article

Influence of phonon confinement, surface stress, and zirconium doping on the Raman vibrational properties of anatase TiO₂ nanoparticles

Christian Lejon, Lars Österlund

Journal of Raman Spectroscopy > 42 > 11 > 2026 - 2035

We present a comprehensive analysis of the Raman spectra of pure and zirconium‐doped anatase TiO₂ nanoparticles. To account for the wavenumber shifts of the E_g(ν₆) mode as a function of particle size (L) and dopant concentration (x), a modification of the standard phonon confinement model (PCM) is introduced, which takes into account the contribution of surface stress by means of the Laplace–Young...

article

Photodegradation of DMMP and CEES on zirconium doped titania nanoparticles

Andreas Mattsson, Christian Lejon, Václav Štengl, Snejana Bakardjieva, more

Applied Catalysis B: Environmental > 2009 > 92 > 3-4 > 401-410

The structure and photocatalytic activity of Zr doped TiO₂ nanocrystallites with a varying Zr content between 0 and 15wt% prepared by an efficient and environmentally benign method has been studied by vibrational spectroscopy, TEM and XRD. It is shown that the presence of Zr⁴⁺ ions stabilizes the anatase structure and delays phase transformation to rutile upon annealing as well as retarding grain...

article

Effect of sample preparation and humidity on the photodegradation rate of CEES on pure and Zn doped anatase TiO2 nanoparticles prepared by homogeneous hydrolysis

Lars Österlund, Václav Štengl, Andreas Mattsson, Snejana Bakardjieva, more

Applied Catalysis B: Environmental > 2009 > 88 > 1-2 > 194-203

Pure titania and titania doped with Zn ²⁺ were prepared by homogeneous hydrolysis in aqueous solution with urea and thioacetamide as precipitating agents. The materials were characterized by XRD, TEM, BET and BJH analysis, which show microporous, nanaocrytsalline anatase phase titania in the size range 4–5nm and specific surface area 200–500m ² /g. Adsorption and photocatalytic decomposition...

article

Bacterial and mammalian cell response to poly(3-sulfopropyl methacrylate) brushes loaded with silver halide salts

Madeleine Ramstedt, Barbro Ekstrand-Hammarström, Andrey V. Shchukarev, Anders Bucht, more

Biomaterials > 2009 > 30 > 8 > 1524-1531

This study investigates the antibacterial and cytotoxic effect of surfaces with sulphonate brushes containing silver salts. By using the same type of samples for both cytotoxicity and antibacterial studies, these two parameters could be compared in a controlled way. The silver was incorporated into the brush in four different forms to enable release of silver ions at different concentrations and different...

article

Adsorption and Solar Light Decomposition of Acetone on Anatase TiO ₂ and Niobium Doped TiO ₂ Thin Films

Andreas Mattsson, Michael Leideborg, Karin Larsson, Gunnar Westin, more

The Journal of Physical Chemistry B > 2006 > 110 > 3 > 1210 - 1220

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Keywords

PHOTOCATALYSIS (4)
TIO2 (4)
ADSORPTION (2)
CEES (2)
CO OXIDATION (2)
DEGRADATION (2)
ETHANOL (2)
FLUCTUATION-ENHANCED SENSING (2)
FORMALDEHYDE (2)
FTIR (2)
GAS SENSOR (2)
HEMATITE (2)
NICKEL OXIDE (2)
RAMAN SPECTROSCOPY (2)
ZNO (2)
4-HYDROXY-2-NONENAL (1)
4-OXO-2-NONENAL (1)
AGGREGATION (1)
ALPHA-SYNUCLEIN (1)
AMYLOID (1)
ANTIBACTERIAL (1)
ATR-FTIR (1)
BICARBONATE (1)
BIOSENSOR (1)
BISTABLE REACTIONS (1)
CATALYSIS (1)
CRP (1)
CRYSTAL ORIENTATION (1)
CYTOTOXIC (1)
DECOLOURIZATION (1)
DEMENTIA WITH LEWY BODIES (1)
DENSITY MEASUREMENT (1)
DFT (1)
DIFFUSE REFLECTANCE (1)
DIFFUSE REFLECTANCE INFRARED FOURIER TRANSFORM SPECTROSCOPY (1)
DMMP (1)
ELECTRON-BEAM LITHOGRAPHY (1)
EXTINCTION (1)
FILMS (1)
FORMIC ACID (1)
FOURIER TRANSFORM INFRARED SPECTROSCOPY (1)
GAS DETECTORS (1)
GAS EVAPORATION (1)
GOETHITE (1)
HOMOGENEOUS HYDROLYSIS (1)
HYDROXYL RADICAL (1)
IGNITION (1)
INFLAMMATION (1)
INFRARED REFLECTION ABSORPTION SPECTROSCOPY (1)
INFRARED SPECTROSCOPY (1)
IRON OXIDE (1)
KINETIC PHASE TRANSITIONS (1)
MAGHEMITE (1)
METAL ION RELEASE (1)
METHANE (1)
MO (1)
NANOCRYSTALLINE DIAMOND (1)
NANOPARTICLES (1)
OLIGOMERS (1)
OXIDATIVE STRESS (1)
PARKINSON'S DISEASE (1)
PHONON CONFINEMENT (1)
PLATINUM (1)
PLATINUM OXIDE (1)
PROTEIN BINDERS (1)
PT (1)
PT/AL2O3 (1)
RAMAN (1)
REACTIVE OXYGEN SPECIES (1)
REACTIVE RED 120 (1)
SILVER (1)
SOLAR PHOTOCATALYTIC (1)
SPECTRAL SELECTIVE FILMS (1)
STEP-RESPONSE EXPERIMENTS (1)
SURFACE MODIFICATION (1)
SURFACE STRESS (1)
TEMPERATURE MEASUREMENT (1)
TEMPERATURE SENSORS (1)
TIALN (1)
TIO2 NANOPARTICLES (1)
TIO2/AC (1)
TRIETHYL PHOSPHATE (1)
TRIMETHYL PHOSPHATE (1)
X-RAY PHOTOELECTRON SPECTROSCOPY (1)
XANES (1)
ZIRCONIUM (1)
ZIRCONIUM DOPING (1)
Α-FE2O3 (1)
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Elsevier (14)
ACS (4)
Wiley (4)
Springer (3)
ieee (1)

Journal

Journal of Catalysis (3)
The Journal of Physical Chemistry B (3)
Applied Catalysis B: Environmental (2)
Journal of Raman Spectroscopy (2)
Analytical and Bioanalytical Chemistry (1)
Arabian Journal of Chemistry (1)
Biochemical and Biophysical Research Communications (1)
Biomaterials (1)
Biophysical Journal (1)
Journal of Colloid And Interface Science (1)
Journal of Materials Science (1)
Langmuir (1)
Photochemistry and Photobiology (1)
Sensors and Actuators B: Chemical (1)
Separation and Purification Technology (1)
Surface Science (1)
Topics in Catalysis (1)
Toxicology and Applied Pharmacology (1)
physica status solidi (a) (1)
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INFONA - science communication portal

Search results for: Lars Österlund

Polarized and non‐polarized Raman spectroscopy of ZnO crystals: Method for determination of crystal growth and crystal plane orientation for nanomaterials

Advanced Oxide Materials − Growth, Application, Characterization

Spectral Selective Solar Light Enhanced Photocatalysis: TiO₂/TiAlN Bilayer Films

Co-adsorption of oxygen and formic acid on rutile TiO2 (110) studied by infrared reflection-absorption spectroscopy

ZnO/spiral-shaped glass for solar photocatalytic oxidation of Reactive Red 120

Fluctuation-enhanced and conductometric gas sensing with nanocrystalline NiO thin films: A comparison

Nanocrystalline diamond sensor targeted for selective CRP detection: an ATR-FTIR spectroscopy study

Nickel oxide thin film sensor for fluctuation-enhanced gas sensing of formaldehyde

Differential cellular responses in healthy mice and in mice with established airway inflammation when exposed to hematite nanoparticles

Changes in secondary structure of α-synuclein during oligomerization induced by reactive aldehydes

In Situ FTIR Spectroscopy Study of the Photodegradation of Acetaldehyde and azo Dye Photobleaching on Bismuth‐Modified TiO₂

Role of bismuth in nano-structured doped TiO₂ photocatalyst prepared by environmentally benign soft synthesis

Large Uptake of Titania and Iron Oxide Nanoparticles in the Nucleus of Lung Epithelial Cells as Measured by Raman Imaging and Multivariate Classification

Adsorption of trimethyl phosphate and triethyl phosphate on dry and water pre-covered hematite, maghemite, and goethite nanoparticles

Enhancement of TiO2 behavior on photocatalytic oxidation of MO dye using TiO2/AC under visible irradiation and sunlight radiation

Influence of phonon confinement, surface stress, and zirconium doping on the Raman vibrational properties of anatase TiO₂ nanoparticles

Photodegradation of DMMP and CEES on zirconium doped titania nanoparticles

Effect of sample preparation and humidity on the photodegradation rate of CEES on pure and Zn doped anatase TiO2 nanoparticles prepared by homogeneous hydrolysis

Bacterial and mammalian cell response to poly(3-sulfopropyl methacrylate) brushes loaded with silver halide salts

Adsorption and Solar Light Decomposition of Acetone on Anatase TiO ₂ and Niobium Doped TiO ₂ Thin Films

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