A5013045993- Quantum Dots Synthesis And Properties
- Advanced Cellulose Research Studies
- Polymer Surface Interaction Studies
- Acoustic Wave Resonator Technologies
- Advanced Sensor and Energy Harvesting Materials
- ZnO doping and properties
- Surface Modification and Superhydrophobicity
- Electrospun Nanofibers in Biomedical Applications
- Perovskite Materials and Applications
- Porphyrin and Phthalocyanine Chemistry
- Luminescence and Fluorescent Materials
- Calcium Carbonate Crystallization and Inhibition
- Adsorption and biosorption for pollutant removal
- Environmental remediation with nanomaterials
- Molecular Junctions and Nanostructures
- Chalcogenide Semiconductor Thin Films
- Iron oxide chemistry and applications
- Advanced biosensing and bioanalysis techniques
- Nanocomposite Films for Food Packaging
- Optical Coatings and Gratings
- Carbon Nanotubes in Composites
- bioluminescence and chemiluminescence research
- Geochemistry and Geologic Mapping
- Organic Electronics and Photovoltaics
- Photodynamic Therapy Research Studies
King Abdullah University of Science and Technology
2014-2015
KTH Royal Institute of Technology
2011-2013
Heidelberg University
2010-2011
The Young's modulus of multilayer films containing nanofibrillated cellulose (NFC) and polyethyleneimine (PEI) was determined using the strain-induced elastic buckling instability for mechanical measurements (SIEBIMM) technique.(1) Multilayer were built up on polydimethylsiloxane substrates electrostatic layer-by-layer assembly. At 50% relative humidity, SIEBIMM gave a constant 1.5 ± 0.2 GPa 35−75 nm thick films. Conversely, in vacuum, 10 times larger, at 17.2 1.2 GPa. A slight decrease...
Thin UV-blocking films of poly(methyl methacrylate) (PMMA) and ZnO quantum dots (QDs) were built-up by spin-coating. Ellipsometry reveals average thicknesses 9.5 8.6 nm per bilayer before after heating at 100 °C for one hour, respectively. The surface roughness measured Atomic force microscopy (AFM) was 3.6 8.4 the ten films, linear increase in thickness as well low increment indicates a stratified multilayer structure smooth interface without aggregation. absorption UV radiation increased...
This study describes the removal of Chromium(VI) from aqueous solutions using surface tailored superparamagnetic iron oxide nanoparticles (SPION) coated with bis(2,4,4-trimethylpentyl)dithiophosphinic acid (Cyanex-301). The synthesized Cyanex-301 SPION has been characterized by Transmission Electron Microscopy (TEM), Fourier-Transfer Infrared Spectroscopy (FT-IR), X-ray Photonic (XPS), and Thermogravimetric Analysis (TGA). adsorption mechanism was proposed to be via complexation between...
In the present study, we introduce a novel method for in vivo imaging of biodistribution single wall carbon nanotubes (SWNTs) labeled with recombinant thermo-stable Luciola cruciata luciferase (LcL). addition, highlight new application green fluorescent proteins which they are utilized as moieties SWNTs. Carbon show great positive potential compared to other drug nanocarriers respect loading capacity, cell internalization, and biodegradability. We have also studied effect binding mode...
Absorbent layers of semiconductor quantum dots (QDs) are now used as material platforms for low‐cost, high‐performance solar cells. The metal oxide nanoparticles an acceptor layer have become integral part the next generation cell. To achieve sufficient electron transfer and subsequently high conversion efficiency in these cells, however, energy‐level alignment interfacial contact between donor units needed. Here, layer‐by‐layer (LbL) technique is to assemble ZnO (NPs), providing adequate...
We show the possibility of modulating triplet-state lifetime cationic porphyrins on surface CdTe quantum dots.
Novel features of the adsorption humic acid on surface aluminium oxide were revealed by means an in situ study quartz crystal microbalance with dissipation (QCM-D). The shows a special case at pH 3 where takes place two steps. Each step has characteristic thickness, kinetics and viscoelasticity. While first low fast almost no viscoelastic character, indicating rigidly adsorbed monolayer, second is much higher slower significant large diffuse layer bulk contributions. In contrast, 5 6.8 was...
The incorporation of nanoparticles into polyelectrolytes thin films opens the way to a broad range applications depending on functionality nanoparticles. In this work, ZnO and poly(acrylic acid) (PAA) were built up using layer-by-layer technique. thickness 20-bilayer film is about 120 nm with surface roughness 22.9 as measured by atomic force microscopy (AFM). Thin ZnO/PAA block UV radiation starting at wavelength 361 due absorption although are highly transparent. Due their high porosity,...
The use of metal oxide interlayers in polymer solar cells has great potential because oxides are abundant, thermally stable, and can be used flexible devices. Here, a layer-by-layer (LbL) protocol is reported as facile, room-temperature, solution-processed method to prepare electron transport layers from commercial ZnO nanoparticles polyacrylic acid (PAA) with controlled tunable porous structure, which provides large interfacial contacts the active layer. Applying LbL approach bulk...
Fluorescence enhancement of organic fluorophores shows tremendous potential to improve image contrast in fluorescence-based bioimaging. Here, we present an experimental study the interaction two cationic porphyrins, meso-tetrakis(1-methylpyridinium-4-yl)porphyrin chloride (TMPyP) and meso-tetrakis(4-N,N,N-trimethylanilinium)porphyrin (TMAP), with surfactant-stabilized zinc oxide nanoparticles (ZnO NPs) based on several steady-state time-resolved techniques. We show first measurements...
The adsorption of humic acid (HA) on an Al2O3 surface in the presence Gd3+ was studied situ by quartz crystal microbalance with dissipation (QCM-D) and ex ellipsometry XPS. Adsorption a HA/Gd3+ complex yielded adlayer mass 354 ng cm−2, is characterized relatively high indicating significant viscoelastic character. viscoelasticity enhanced salt water molecules penetrating causing it to stretch. dry state average thickness about 23 Å as measured ellipsometry. Ellipsometry revealed slower...
Abstract Recent findings have shown that it is possible to use the Layer-by-Layer technique create nanofibrillated cellulose / polyethyleneimine interference films whose colour change with relative humidity. This study uses different optical models describe spectral ellipsometry measurements data of and how film properties alter in dry humid environments. The results indicate water condensation initially filling surface pores within seconds whereas relaxation adjust added a slower process...