A5056036784- Coagulation and Flocculation Studies
- Surfactants and Colloidal Systems
- Nuclear Physics and Applications
- Minerals Flotation and Separation Techniques
- Electrostatics and Colloid Interactions
- Pickering emulsions and particle stabilization
- Quantum Electrodynamics and Casimir Effect
- Lipid Membrane Structure and Behavior
- Per- and polyfluoroalkyl substances research
- Photonic Crystals and Applications
- Scientific Research and Discoveries
- Iron oxide chemistry and applications
- Photonic Crystal and Fiber Optics
- NMR spectroscopy and applications
- Antimicrobial Peptides and Activities
- Biocrusts and Microbial Ecology
- Hemoglobin structure and function
- Effects and risks of endocrine disrupting chemicals
- Additive Manufacturing Materials and Processes
- Atomic and Subatomic Physics Research
- Polymer Science and PVC
- Microfluidic and Bio-sensing Technologies
- Diatoms and Algae Research
- Mechanical and Optical Resonators
- Particle Dynamics in Fluid Flows
RISE Research Institutes of Sweden
2018-2024
Uppsala University
2010-2018
Lipid nanocapsules (LNCs) are increasingly being used for various drug delivery applications due to their versatile nature and ability carry a wide variety of therapeutic molecules. In the present investigation, small-angle X-ray (SAXS) neutron scattering (SANS) techniques were elucidate structure LNCs. Overall, size measurements obtained from SAXS SANS complemented with dynamic light scattering, zeta potential, cryogenic transmission electron microscopy measurements. The structural aspects...
Abstract Additive manufacturing (or 3D printing) opens the possibility of creating new designs and objects with materials rapidly economically. Particularly for use polymers polymer composites, simple printers can make high quality products, these be produced easily in offices, schools workshops laboratories. This technology has opened a route many to test ideas or custom devices. It is possible manufacture complex geometries that would difficult even impossible create traditional methods....
Dispersions of cubic liquid crystalline phases, also known as cubosomes, have shown great promise delivery vehicles for a wide range medicines. Due to their ordered structure, comprising alternating hydrophilic and hydrophobic domains, cubosomes possess unique properties compatibility with both water-soluble -insoluble drugs. However, the drug mechanism cubosome interaction human cells bacteria are still poorly understood. Herein, we reveal how loaded cathelicidin antimicrobial peptide...
An extract from the seeds of Moringa oleifera tree that is principally a low molecular mass protein known to be efficient as coagulating agent for water treatment. The present paper investigates adsorption purified silica interfaces in order elucidate mechanism its function flocculent. Neutron reflection permits determination structure and composition interfacial layers at solid/solution interface. Dense with about 5.5 mg m−2 were found concentrations above 0.025% wt. overall thickness dense...
Measurements of a well-characterised standard sample can verify the performance an instrument. Typically, small-angle neutron scattering instruments are used to investigate wide range samples and may often be in number configurations. Appropriate useful test different aspects hardware as well that data reduction analysis software. on with intrinsic characteristics designs round robin not only better characterise for wider conditions but also, perhaps more importantly, reveal limits current...
Proteins extracted from the seeds of Moringa trees are effective flocculents for particles dispersed in water and attractive as a natural sustainable product use purification. Studies with model system consisting polystyrene latex have shown that protein adsorbs to surface causes flocculation unusually dense aggregates. Small-angle neutron scattering exploits contrast matching deuterated D2O highlight bound has adsorbed amount reaches about 3 mg m−2. The form very compact flocs characterized...
The adsorption of sodium bis 2-ethylhexyl sulfosuccinate, NaAOT, to a sapphire surface from aqueous solution has been studied by neutron reflection at concentrations above the critical micelle concentration (cmc). Complementary measurements bulk structure were made with small-angle scattering and grazing incidence scattering. At about 1% wt (10 × cmc), lamellar phase NaAOT was observed both in bulk. seen interface for 2% is 35 ± 2 Å thick bilayer adsorbed maximum packing density, followed an...
Changes of scattering are observed as the grazing angle incidence an incoming beam increases and probes different depths in samples. A model has been developed to describe intensity grazing-incidence small-angle neutron (GISANS) experiments. This includes significant effects instrument resolution, sample transmission, which depends on both absorption scattering, structure. The calculations tested with self-organized structures two colloidal samples size particles that were measured...
The paper describes the adsorption of purified protein from seeds Moringa oleifera to a sapphire interface and effects addition anionic surfactant sodium dodecylsulfate (SDS) cationic hexadecyltrimethylammonium bromide (CTAB). Neutron reflection was used determine structure composition interfacial layers adsorbed at solid/solution interface. maximum surface excess found be about 5.3 mg m−2. does not desorb solid/liquid when rinsed with water. Addition SDS increases reflectivity indicating...
Aerosol-OT (sodium bis 2-ethylhexyl sulfosuccinate or NaAOT) adsorbs to hydrophilic sapphire solid surfaces. The structure of the formed bilayer has been determined over concentration range 0.2-7.4 mM NaAOT. It was found that hydrocarbon tails pack at maximum packing limit very low concentrations, and thickness concentration-independent. adsorption increase with concentration, surfactant molecules closer laterally. area per molecule change from 138 ± 25 51 4 A(2) studied, layer being...
Sedimentation, or creaming, of samples can significantly alter the amount material in beam during small-angle scattering experiments. Simple rotating mounts that ameliorate this effect are described and design criteria carefully discussed. A modular permits simple adaptation to various instruments different sample cells. Temperature control range 10 °C below ambient about +40 has been implemented using air flow a Peltier device. Example ultra neutron data shown exploit simplicity capability...
The design of sample cells to study solid/liquid interfaces by neutron reflection is presented. Use standardized components and a modular has allowed wide range experiments that include grazing incidence scattering conventional small-angle scattering. Features reduce background are emphasized. Various flow arrangements fill replenish the liquid in cell as well continuous stirring described.
The three-dimensional crystal structure of charge stabilised polystyrene latex in deionised water was investigated by small-angle neutron diffraction. Crystallisation with a grain size approximately 1 × cm2 observed when the sample flowed gently to 2 mm path cell. Bragg scattering peaks arising from were under rotation about three perpendicular axes sample. diffraction patterns indicate clearly that there is cubic close packed 110 axis cell wall. Rotations small steps show large changes and...
Experimental studies have been made to test the idea that seed proteins from Moringa oleifera which are novel, natural flocculating agents for many particles could be used promote adhesion at planar interfaces and hence provide routes useful nanostructures. The bind irreversibly silica interfaces. Surfaces had exposed protein solutions rinsed were then dispersions of sulfonated polystyrene latex. Atomic force microscopy was count particle density identified sticking probability close 1....
Quartz crystal microbalance with dissipation (QCM-D) monitoring is used to investigate the adsorption processes at liquid-solid interfaces and applied increasingly characterize viscoelastic properties of complex liquids. Here, we contribute new insights into latter field by using QCM-D structure near interface high-frequency charge-stabilized polystyrene particles (radius 37 nm) dispersed in water. The study reveals changes increasing ionic strength particle concentration. Replacing water a...
We report on the formation of large two-dimensional domains (about 20 cm2) oriented and ordered structures polystyrene particles dispersed in water at a solid/liquid interface. Gentle flow sample into holder shear strain rate about 0.1 s−1 caused air/latex meniscus to self-assemble regular structure both solid silica or alumina surfaces. Scattering experiments show that particle separation surface was same as bulk determined by repulsion arising from charges particles. Close-packed planes...
The use of DEHP (diethylhexyl phthalate) is now banned for most applications in Europe; the exception blood bags, where its toxicity overshadowed by ability to extend storage life red cells. Another plasticiser, BTHC (butanoyl trihexyl citrate), used paediatric bags but does not stabilise cells as effectively. Interactions between plasticisers and lipids are investigated with a phospholipid, DMPC, understand increased stability presence well bioaccumulation identify differences BTHC. Mixed...