Zbigniew Rozynek

Zbigniew Rozynek
Adam Mickiewicz University | UAM · Faculty of Physics

PhD

About

53
Publications
12,231
Reads
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1,127
Citations
Citations since 2016
27 Research Items
840 Citations
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
Additional affiliations
October 2019 - present
Adam Mickiewicz University
Position
  • Professor (Associate)
September 2018 - September 2019
Harvard University
Position
  • PostDoc Position
September 2015 - September 2018
Adam Mickiewicz University
Position
  • PostDoc Position
Education
September 2019 - October 2019
Adam Mickiewicz University
Field of study
  • Physics
September 2007 - October 2011
January 2006 - June 2006
University of Surrey
Field of study
  • Physics

Publications

Publications (53)
Article
Full-text available
Droplets covered by adsorbed particles display a wide range of research studies and applications, including stabilising emulsions used in the food or cosmetic industry, and fabricating new materials, such as microcapsules or multi-cavity structures. Pickering emulsions are commonly prepared by bulk emulsification techniques, for instance, by ultras...
Article
Full-text available
Drops covered by adsorbed particles are a prominent research topic because they hold promise for a variety of practical applications. Unlocking the enormous potential of particle-laden drops in new material fabrication, for instance, requires understanding how surface particles affect the electrical and deformation properties of drops, as well as d...
Article
Full-text available
One-dimensional conductive particle assembly holds promise for a variety of practical applications, in particular for a new generation of electronic devices. However, synthesis of such chains with programmable shapes outside a liquid environment has proven difficult. Here we report a route to simply 'pull' flexible granular and colloidal chains out...
Article
Full-text available
Janus and patchy particles have designed heterogeneous surfaces that consist of two or several patches with different materials properties. These particles are emerging as building blocks for a new class of soft matter and functional materials. Here we introduce a route for forming heterogeneous capsules by producing highly ordered jammed colloidal...
Article
Full-text available
Adsorption and assembly of colloidal particles at the surface of liquid droplets are at the base of particle-stabilized emulsions and templating. Here we report that electrohydrodynamic and electro-rheological effects in leaky-dielectric liquid drops can be used to structure and dynamically control colloidal particle assemblies at drop surfaces, in...
Article
Full-text available
Assembling microparticles into one-dimensional (1D) particle structures formed outside a liquid environment is challenging. This greatly hinders possible applications of such structures and the development of new materials. Herein, we demonstrate a simple, efficient, and easy-to-implement method for fabricating one particle–thick chain-like structu...
Article
Full-text available
Particle-covered droplets are used in several fundamental studies and practical applications. For many applications, it is important to understand the mechanics of these droplets subjected to induced external stresses, such as an electric field (E-field). Several research groups have studied the deformation and stability of droplets subjected to un...
Article
Full-text available
Understanding of the behavior of an individual droplet suspended in a liquid and subjected to a stress is important for studying and designing more complex systems, such as emulsions. Here, we present an experimental study of the behavior of a particle-covered droplet and its particle shell under compressive stress. The stress was induced by an app...
Article
Full-text available
Droplets covered with densely packed solid particles, often called Pickering droplets, are used in a variety of fundamental studies and practical applications. For many applications, it is essential to understand the mechanics of such particle-laden droplets subjected to external stresses. Several research groups have studied theoretically and expe...
Article
Full-text available
Electrically insulating objects immersed in a weakly conducting liquid may Quincke rotate when subjected to an electric field. Experimental and theoretical investigations of this type of electrorotation typically concern rigid particles and particle-free droplets. This work provides the basic features of electric field-induced rotation of particle-...
Article
Ferrofluids consisting of stabilized iron oxide nanoparticles and insulating oils have emerged as a promising substitute for liquid dielectrics in electrical engineering applications. Recent enhancements of electrical insulating liquids rely on preparation of ferrofluids on emerging insulating oils available on the market. The present work reports...
Article
Particle-stabilised emulsions are of interest to many scientists in both academia and industry as they hold promise for numerous applications. There is a lot of research effort put into developing new methods for their fabrication. Often, different experimental techniques are used for monitoring the process of the emulsion formation. However, the c...
Article
Full-text available
Similar to human skin, a monolayer of packed particles capillary bound to a liquid interface wrinkles when subjected to compressive stress. The induced wrinkles absorb the applied stress, and do not disappear unless the stress is removed. Experimental and theoretical investigations of wrinkle formation typically concern flat particle monolayers sub...
Article
Full-text available
Active, tunable and reversible opening and closing of particle shells on droplets may facilitate chemical reactions in droplets and enable various small-scale laboratory operations, including online detection, measurement, and adjustment of droplet liquid. Manipulating various types of particle shells in a controlled manner requires new routes. Thi...
Article
In the present work the incorporation of two model drugs, sulfamethoxazole (SMX) and trimethoprim (TMP) on the Li-fluorohectorite (LiFHt), synthetic clay mineral was evaluated. Understanding the interactions established between these two antibiotics-which are complementary forms from the pharmaceutical point of view-and LiFHt, allows to develop new...
Article
Full-text available
Being able to systematically modify the electric properties of nano- and microparticles opens up new possibilities for the bottom-up fabrication of advanced materials such as the fabrication of one-dimensional (1D) colloidal and granular materials. Fabricating 1D structures from individual particles offers plenty of applications ranging from electr...
Article
Full-text available
Different natural clay minerals, including halloysite, montmorillonite and kaolinite, have been proven to be efficient drug carriers providing for high and long lasting drug concentrations owing to their adsorption capacity and ion exchange property. Synthetic clays, however, are advantageous over the natural clay minerals in terms of purity of com...
Article
Full-text available
Fluid drops coated with particles, so-called Pickering drops, play an important role in emulsion and capsule applications. In this context, knowledge of mechanical properties and stability of Pickering drops are essential. Here we prepare Pickering drops via electric field-driven self-assembly. We use direct current (DC) electric fields to induce m...
Article
Full-text available
A designed assembly of particles at liquid interfaces offers many advantages for development of materials, and can be performed by various means. Electric fields provide a flexible method for structuring particles on drops, utilizing electrohydrodynamic circulation flows, and dielectrophoretic and electrophoretic interactions. In addition to the pr...
Article
We describe theoretically and validate experimentally the mechanism of formation of capillary bridges during pulling a beaded chain out from a liquid with a planar surface. There are two types of capillary bridges present in this system, namely the sphere-planar liquid surface bridge initially formed between the spherical bead leaving the liquid ba...
Article
In ultrasonic hyperthermia, ultrasound-induced heating is achieved by the absorption of wave energy and its conversion into heat. The effectiveness of ultrasounds can be improved by using sonosensitisers that greatly attenuate ultrasonic waves and then dissipate the acquired energy in the form of heat. One possible candidate for such a sonosensitis...
Article
Full-text available
Manipulation of particles at the surface of a droplet can lead to the formation of structures with heterogeneous surfaces, including patchy colloidal capsules or patchy particles. Here, we study the assembly and rearrangement of microparticles confined at the surface of oil droplets. These processes are driven by electric-field-induced hydrodynamic...
Article
Full-text available
A colloidosome, i.e., a selectively permeable capsule composed of colloidal particles forming a stable homogenous shell, is a tiny container that can be used for storage, transportation, and release of cargo species. There are many routes to preparing colloidosomes; dozens of examples of future applications of such colloidal capsules have been demo...
Article
Ultrasonic hyperthermia is a method of cancer treatment in which tumors are exposed to an elevated cytotoxic temperature using ultrasound (US). In conventional ultrasonic hyperthermia, the ultrasound-induced heating in the tumor is achieved through the absorption of wave energy. However, to obtain appropriate temperature in reasonable time, high US...
Article
Full-text available
Ultrasonic hyperthermia is a method of cancer treatment in which tumors are exposed to an elevated cytotoxic temperature using ultrasound (US). In conventional ultrasonic hyperthermia, the ultrasound-induced heating in the tumor is achieved through the absorption of wave energy. However, to obtain appropriate temperature in reasonable time, high U...
Article
Full-text available
We experimentally investigate the rotation of plate shaped aggregates of clay mineral particles immersed in silicone oil. The rotation is induced by an external electric field. The rotation time is measured as a function of the following parameters: electric field strength, the plate geometry (length and width) and the dielectric properties of the...
Article
Full-text available
Patchy colloidal capsules, i.e., hollow structures with permeable heterogeneous surfaces, possess advantageous properties when compared with their homogenous counterparts. For example, owing to specific interactions between patches they can self-assemble into complex structures to form functional materials. Fabrication of patchy colloidal capsules...
Article
Full-text available
A good material for CO 2 capture should possess some specific properties: (i) a large effective surface area with good adsorption capacity, (ii) selectivity for CO 2 , (iii) regeneration capacity with minimum energy input, allowing reutilization of the material for CO 2 adsorption, and (iv) low cost and high environmental friendliness. Smectite cla...
Article
The magnetotactic bacteria synthesize chains of nano-sized magnetic particles that function as a compass needle to navigate in the direction of the earth’s magnetic field. Magnetosomes are bacterial magnetic nanoparticles containing iron mineral crystals of magnetite or greigite, enveloped by a natural biological membrane. The objective of the work...
Article
Full-text available
In this work we report X-Ray Diffraction (XRD) and Energy Dispersive X-Ray Spectroscopy (EDS) measurements to investigate the confined cation exchange process in saline aqueous suspen-sions of a synthetic clay mineral from Lithium-Fluorohectorite to Nickel-Fluorohectorite, as well as the reverse process from Nickel-Fluorohectorite to Lithium-Fluoro...
Article
Particles can adsorb strongly at liquid interfaces due to capillary forces, which in practice can confine the particles to the interface. Here we investigate the electrohydrodynamic flow driven packing and deformation of colloidal particle layers confined at the surface of liquid drops. The electrohydrodynamic flow has a stagnation point at the dro...
Article
Functionalities of clay-polymer nanocomposites are related to the degree of clay particle exfoliation and orientation within the polymer matrix. Exploration of new physical methods for such nanocomposite processing is currently an active field of research. In the present work, polypropylene-organoclay nanocomposites were prepared by melt intercalat...
Article
The aim of this work is to investigate the effect of surface modification of superparamagnetic magnetite nanoparticles (sterically stabilized by sodium oleate) by the dextran biocompatible layer on the rheological behavior of water-based magnetic fluids. The flow curves were measured as a function of the magnetic field strength by means of rheometr...
Article
We study the behavior of fluorohectorite synthetic clay particles dispersed in paraffin wax. We report wide-angle x-ray scattering related to electric-field-induced alignment of the embedded clay particles. The development of anisotropic arrangement of the particles is measured during melting and crystallization of the composites. The degree of ani...
Article
The combination of nanoparticles and polymers into nanocomposite gels has been shown to be a promising route to create soft materials with new or improved properties. In the present work we have made use of Laponite nanoparticles in combination with a poly(N-isopropylacrylamide) (PNIPAAM) polymer, and describe a phenomenon taking place during polym...
Conference Paper
The objective of the paper is to show that clay particles can be aligned in different hosting media, such as: silicone oil, paraffin-wax, polystyrene and ambient air. The use of an electric field is an easily controllable, non-intrusive manner of inducing such an alignment. Depending on the medium used, a large span in time constants for the orient...
Conference Paper
The response of rotational alignment of lithium fluorohectorite (Li-Fh) to an external electric field has been studied by employing image analysis. Large aggregates consisting of many single clay particles were prepared using a sedimentation technique in order to control both their shapes and sizes. Such aggregates have a layered structure which wa...
Article
A series of nanostructured titanium oxide particles were synthesized by a simple wet chemical method and characterized by means of small-angle x-ray scattering (SAXS)/wide-angle x-ray scattering (WAXS), atomic force microscope (AFM), scanning electron microscope (SEM), transmission electron microscope (TEM), thermal analysis, and rheometry. Tetrabu...
Article
This report focuses on both the characterization of organically modified fluorohectorite (Fh) clay particles and their electric-field-induced alignment when suspended in a non-polar liquid (silicone oil). Thermal decomposition temperatures of the surfactant molecules adsorbed on the clay surfaces and those being intercalated between clay crystallin...
Article
The effect of magnetic field on the structure formation in an oil-based magnetic fluid with various concentrations of magnetite particles was studied. The evaluation of the experimental data obtained from small-angle X-ray scattering and ultrasonic attenuation indicates the formation of chain-like aggregates composed of magnetite particles. The exp...
Article
The electric field induced structuring in clay–oil suspensions has been studied by means of wide angle x-ray scattering (WAXS), rheometry, scanning electron microscopy (SEM), as well as leak current density and dielectric constant measurements. The clay particles' orientation distribution was inferred from the azimuthal changes of the clay diffract...
Article
We have demonstrated a facile carbonate-assisted hydrothermal route for synthesis of well-defined nanoporous copper oxide microstructures with high surface area. The nanoporous CuO microstructures were synthesised by adding sodium hydrogen carbonate (NaHCO3) to an aqueous solution of copper chloride (CuCl2) in the presence of poly(vinylpyrrolidone)...
Article
We describe a rapid environmentally friendly wet-chemical approach to synthesize extremely stable non-toxic, biocompatible, water-soluble monodispersed gold nanoparticles (AuNPs) in one step at room temperature. The particles have been successfully achieved in just a few minutes by merely adding sodium hydroxide (NaOH) acting as an initiator for th...
Article
Cetyltrimethylammonium bromide (CTAB) modified synthetic laponite is synthesized by an ion exchange method and characterized by simultaneous small-angle X-ray scattering (SAXS) and wide angle X-ray scattering (WAXS), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive spectrometry (EDS), at...
Article
In the general context of self-assembly of nanolayered clay, we have studied both kaolinite and montmorillonite guided assembly into chain-like structures in gelatin hydrogel. The electrorheological (ER) elastomers, containing clay particles which dispersed in gelatin/water matrix, were prepared with or without the applied DC electric field and cro...
Article
The dynamic chain and column formation of 5wt.% clay particles suspended in silicone oil has been studied using synchrotron Wide Angle X-Ray Scattering (WAXS) technique and rheometry. The anisotropic arrangement of particles described by the global order parameter S has been investigated. The WAXS data have also allowed distinguishing between the c...
Conference Paper
This paper presents three different Microassembly examples. The first part of the paper presents a solution based on a laser system, next a contact-less microdispensing system and finally an innovative hot air stream joining system. One of the most remarkable differences between these methods is the different material requirements: meanwhile the la...
Conference Paper
This paper describes the first steps for the fabrication of low-cost cantilever arrays, developed at RAL, on non-silicon polymer substrates with vertical interconnects, produced at Profactor. The deflection and actuation of these cantilevers is based on the bimorph thermal actuation principle. The fabrication of the cantilever arrays requires many...
Conference Paper
Few technical fields are so multidisciplinary and present so challenging demands as microtechnologies. The Research and Training Network "Advanced Methods and Tools for Handling and Assembly in Microtechnology" (ASSEMIC) addresses this research field at a European scale. ASSEMIC brings together a consortium of 14 participants, focusing their effort...

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Projects (2)
Project
The project aims to investigate the process of preparation of oil-in-oil particle-stabilized emulsions (also called Pickering emulsions) using ultrasound and the electric field. The characteristics of such prepared emulsions are presented as well as their potential applications, i.e. heating under the alternating magnetic field and fabrication of colloidal capsules for magnetic particles used as stabilizers.