Publications in journals ranked by Journal Citation Reports (JCR) 
Publications in other journals ranked by Ministry of Science and Higher Education
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Publications in other journals and conference proceedings
Affiliation to IPPT PAN

1.von Tiedemann P., Maciol K., Preis J., Sajkiewicz P., Frey H., Rapid One-Pot Synthesis of Tapered Star Copolymers via Ultra-Fast Coupling of Polystyryllithium Chain Ends, Polymer Chemistry, ISSN: 1759-9954, DOI: 10.1039/C8PY01656A, pp.1-7, 2019
von Tiedemann P., Maciol K., Preis J., Sajkiewicz P., Frey H., Rapid One-Pot Synthesis of Tapered Star Copolymers via Ultra-Fast Coupling of Polystyryllithium Chain Ends, Polymer Chemistry, ISSN: 1759-9954, DOI: 10.1039/C8PY01656A, pp.1-7, 2019

Abstract:
Highly efficient stoichiometric coupling of sterically hindered polystyryllithium (PS-Li) chain ends was achieved using tetra[3-(chloro-dimethylsilyl)propyl]silane (TCDMSPS) as the linking agent. Based on the disparate reactivities of isoprene (I, rI = 11.0) and styrene (S, rS = 0.049) in the anionic copolymerization in nonpolar media, poly(isoprene0.5-grad-styrene0.5) (P(I0.5-grad-S0.5)) tapered 4-arm star copolymers were synthesized in only two steps. The tapered 4-arm star copolymers (Mwtargeted = 40 to 160 kg mol-1) were synthesized with high star functionalities f (Mw,star/Mw,arm = 3.68 – 3.98), low dispersity (Ð = 1.08 – 1.15) and minimal residual precursor content (2-8 wt%), avoiding fractionation or other purification methods. Coupling kinetics measurements revealed that for the synthesis of polystyrene (PS) 4-arm stars (12 kg mol-1) a coupling efficiency of 98% was already achieved within 2 minutes. All star polymers were analyzed by size exclusion chromatography (SEC) viscometry with universal calibration (UC) as well as NMR spectroscopy. Well-defined nanofibers from the tapered copolymer stars were obtained via electrospinning.

2.Węglewski W., Krajewski M., Bochenek K., Denis P., Wysmołek A., Basista M., Anomalous size effect in thermal residual stresses in pressure sintered alumina-chromium composites, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2019.138111, Vol.762, No.138111, pp.1-10, 2019
Węglewski W., Krajewski M., Bochenek K., Denis P., Wysmołek A., Basista M., Anomalous size effect in thermal residual stresses in pressure sintered alumina-chromium composites, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2019.138111, Vol.762, No.138111, pp.1-10, 2019

Abstract:
This paper explores an anomalous size effect in thermal residual stresses occurring in the alumina matrix of Al2O3/Cr sintered composite upon varying the particle size of the chromium reinforcement. When a coarse chromium powder (45 µm mean particle size) is used the average residual stress in the alumina phase after cooling is compressive in accordance with the classical Eshelby solution. However, in the case of a fine chromium (5 µm mean particle size) it switches to tension. This effect, detected by photoluminescence piezospectroscopy, is also confirmed by X-ray and neutron diffraction experiments. As the classical micromechanics models are incapable to capture it, a finite element model is developed with the actual composite microstructure being reconstructed from the microtomography images. It is shown by numerical simulations that the anomalous size effect is associated with the complex microstructure of the composite fabricated with the fine chromium powder. It is also pointed out that the temperature dependence of the coefficients of thermal expansion of the matrix and the reinforcement affects the residual stress levels.

Keywords:
thermal residual stress; metal-ceramic composites; size effect; microcomputed tomography, finite element analysis

3.Chrzanowska-Giżyńska J., Denis P., Giżyński M., Kurpaska Ł., Mihailescu I., Ristoscu C., Szymański Z., Mościcki T., Thin WBx and WyTi1−yBx films deposited by combined magnetron sputtering and pulsed laser deposition technique, APPLIED SURFACE SCIENCE, ISSN: 0169-4332, DOI: 10.1016/j.apsusc.2019.02.006, Vol.478, pp.505-513, 2019
Chrzanowska-Giżyńska J., Denis P., Giżyński M., Kurpaska Ł., Mihailescu I., Ristoscu C., Szymański Z., Mościcki T., Thin WBx and WyTi1−yBx films deposited by combined magnetron sputtering and pulsed laser deposition technique, APPLIED SURFACE SCIENCE, ISSN: 0169-4332, DOI: 10.1016/j.apsusc.2019.02.006, Vol.478, pp.505-513, 2019

Abstract:
The coatings of tungsten borides (WBx) and tungsten borides doped with titanium (WyTi1−yBx) were deposited by using combined magnetron sputtering - pulsed laser deposition technique. In the case of WBx coatings, pure tungsten target was evaporated by a laser pulse at 1064 nm wavelength and pure boron target was sputtered by a magnetron. In the case of WyTi1−yBx coatings, the W2B5 target was sputtered by the magnetron and titanium target was evaporated by the laser pulse at 1064 nm wavelength. The content of titanium dopant changed from 1.1 to 5.5 at.%. The microstructure, chemical and phase composition of deposited coatings were investigated by means of Scanning Electron Microscopy, Energy Dispersive X-Ray Spectroscopy, X-Ray Photoelectron Spectroscopy and X-Ray Diffractometry, respectively. The Vickers hardness and Young's modulus were determined by using the nanoindentation test. Nanocrystalline WB coatings with dominant WB2 phase were obtained at a substrate temperature of 520 °C. The coatings were superhard with a hardness of 47–50 GPa and the mean value of surface roughness was <6 nm. The WBx coatings doped with 5.5 at.% Ti had hardness similar to the coatings sputtered by magnetron from W2B5 target.

Keywords:
The superhard WyBx thin films was deposited with hybrid laser-magnetron technology, The MS-PLD method allows for the deposition of ternary borides such as WyTi1−yBx, The MS-PLD method enables to control the chemical and phase composition of films, The deposited films are smooth with hardness above 50 GPa, Crystalline films were deposited only on a substrate kept an elevated temperature

4.Enayati M.S., Neisiany R.E., Sajkiewicz P., Behzad T., Denis P., Pierini F., Effect of nanofiller incorporation on thermomechanical and toughness of poly (vinyl alcohol)-based electrospun nanofibrous bionanocomposites, Theoretical and Applied Fracture Mechanics, ISSN: 0167-8442, DOI: 10.1016/j.tafmec.2018.11.006, Vol.99, pp.44-50, 2019
Enayati M.S., Neisiany R.E., Sajkiewicz P., Behzad T., Denis P., Pierini F., Effect of nanofiller incorporation on thermomechanical and toughness of poly (vinyl alcohol)-based electrospun nanofibrous bionanocomposites, Theoretical and Applied Fracture Mechanics, ISSN: 0167-8442, DOI: 10.1016/j.tafmec.2018.11.006, Vol.99, pp.44-50, 2019

Abstract:
The current work studies the electrospun poly (vinyl alcohol) (PVA) nanofibers and its nanocomposites including nanohydroxy apatite (nHAp) and nHAp/cellulose nanofibers (CNFs), emphasizing the impact of nanofillers on the toughness of nanofibers. PVA nanofibers were incorporated with 10 wt% of nHAp and then various amounts of CNF were added to subsequent PVA/nHAp fibrous nanocomposites. The morphology of nonwoven mats was studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). While neat PVA nanofibers were smooth and uniform in thickness, the nanofiller loading resulted in thinner fibers with less uniformity. Furthermore, the thermal properties of the nonwoven network of fibers were characterized employing thermogravimetric analysis (TGA). Although the maximum loss mass temperature of PVA was partially reduced upon addition of nanofillers, the onset of decomposition was not altered. The mechanical characterizations were performed using static tensile and dynamic mechanical analysis (DMA). Compared to neat PVA mats, the tensile test of nanocomposites mats demonstrated the significant increase in Young’s modulus; however, strain at break was dramatically reduced. In addition, the fracture work was assessed from the area under the stress-strain curve, which showed brittleness of fibrous nanocomposites due to the nanofiller incorporation. Field emission SEM (FE-SEM) was employed to scan the fracture surface of stretched fibers. The increase in modulus of electrospun mats was also shown by DMA in frequency mode. In parallel, both tensile test and DMA confirmed the change in fracture of PVA fibers from a tough to brittle mode, due to the nanofiller addition.

Keywords:
Electrospun nanocomposites, Nanofillers, Toughness, Mechanical properties

5.Kołbuk D., Urbanek O., Denis P., Choińska E., Sonochemical coating as an effective method of polymeric nonwovens functionalization, Journal of Biomedical Materials Research Part A, ISSN: 1549-3296, DOI: 10.1002/jbm.a.36751, pp.1-11, 2019
Kołbuk D., Urbanek O., Denis P., Choińska E., Sonochemical coating as an effective method of polymeric nonwovens functionalization, Journal of Biomedical Materials Research Part A, ISSN: 1549-3296, DOI: 10.1002/jbm.a.36751, pp.1-11, 2019

Abstract:
A surface of polymeric nonwovens may be coated with various types of nanoparticles for medical applications, filtration, and so forth. However, quite often methods used for surface modification are difficult to scale up or are not applicable for polymers. In this article, we present one-step process enabling nonwovens functionalization. Poly(l-lactide-co-glicolide) (PLGA) nonwovens were prepared by electrospinning process and coated with hydroxyapatite nanoparticles (HAp) using ultrasonic processing. The effect of the process was evaluated with various techniques. HAp layer was successfully attached without loss of structural properties of HAp or PLGA nonwovens. The analysis confirmed the decrease of hydrophobicity of coated nonwoven, as well as its biocompatibility, making this material valuable from the perspective of medical applications. The sonochemical functionalization of polymeric nonwovens may be considered as an effective and economic method, enhancing surface properties of electrospun nonwovens for various applications.

Keywords:
lectrospinning, fibrous composites, nanoparticles, surface modification, ultrasonic treatment

6.Woźniak M., Chlanda A., Oberbek P., Heljak M., Czarnecka K., Janeta M., John Ł., Binary bioactive glass composite scaffolds for bone tissue engineering—Structure and mechanical properties in micro and nano scale. A preliminary study, Micron, ISSN: 0968-4328, DOI: 10.1016/j.micron.2018.12.006, Vol.119, pp.64-71, 2019
Woźniak M., Chlanda A., Oberbek P., Heljak M., Czarnecka K., Janeta M., John Ł., Binary bioactive glass composite scaffolds for bone tissue engineering—Structure and mechanical properties in micro and nano scale. A preliminary study, Micron, ISSN: 0968-4328, DOI: 10.1016/j.micron.2018.12.006, Vol.119, pp.64-71, 2019

Abstract:
Composite scaffolds of bioactive glass (SiO 2 -CaO) and bioresorbable polyesters: poly- l -lactic acid (PLLA) and polycaprolactone (PCL) were produced by polymer coating of porous foams. Their structure and mechanical properties were investigated in micro and nanoscale, by the means of scanning electron microscopy, PeakForce Quantitative Nanomechanical Property Mapping (PF-QNM) atomic force microscopy, micro-computed tomography and contact angle measurements. This is one of the first studies in which the nanomechanical properties (elastic modulus, adhesion) were measured and mapped simultaneously with topography imaging (PF-QNM AFM) for bioactive glass and bioactive glass – polymer coated scaffolds. Our findings show that polymer coated scaffolds had higher average roughness and lower stiffness in comparison to pure bioactive glass scaffolds. Such coating-dependent scaffold properties may promote different cells-scaffold interaction.

Keywords:
Bone tissue engineering, Composite scaffold, Bioactive glass, Mechanical properties

7.Jeznach O., Kołbuk D., Sajkiewicz P., Aminolysis of Various Aliphatic Polyesters in a Form of Nanofibers and Films, Polymers, ISSN: 2073-4360, DOI: 10.3390/polym11101669, Vol.11, No.1669, pp.1-16, 2019
Jeznach O., Kołbuk D., Sajkiewicz P., Aminolysis of Various Aliphatic Polyesters in a Form of Nanofibers and Films, Polymers, ISSN: 2073-4360, DOI: 10.3390/polym11101669, Vol.11, No.1669, pp.1-16, 2019

Abstract:
Surface functionalization of polymer scaffolds is a method used to improve interactions of materials with cells. A frequently used method for polyesters is aminolysis reaction, which introduces free amine groups on the surface. In this study, nanofibrous scaffolds and films of three different polyesters–polycaprolactone (PCL), poly(lactide-co-caprolactone) (PLCL), and poly(l-lactide) (PLLA) were subjected to this type of surface modification under the same conditions. Efficiency of aminolysis was evaluated on the basis of ninhydrin tests and ATR–FTIR spectroscopy. Also, impact of this treatment on the mechanical properties, crystallinity, and wettability of polyesters was compared and discussed from the perspective of aminolysis efficiency. It was shown that aminolysis is less efficient in the case of nanofibers, particularly for PCL nanofibers. Our hypothesis based on the fundamentals of classical high speed spinning process is that the lower efficiency of aminolysis in the case of nanofibers is associated with the radial distribution of crystallinity of electrospun fiber with more crystalline skin, strongly inhibiting the reaction. Moreover, the water contact angle results demonstrate that the effect of free amino groups on wettability is very different depending on the type and the form of polymer. The results of this study can help to understand fundamentals of aminolysis-based surface modification.

Keywords:
aminolysis, polyester, electrospinning, nanofibers, film, surface chemical modification

8.Cegielska O., Sajkiewicz P., Targeted Drug Delivery Systems for the Treatment of Glaucoma: Most Advanced Systems Review, Polymers, ISSN: 2073-4360, DOI: 10.3390/polym11111742, Vol.11, No.1742, pp.1-18, 2019
Cegielska O., Sajkiewicz P., Targeted Drug Delivery Systems for the Treatment of Glaucoma: Most Advanced Systems Review, Polymers, ISSN: 2073-4360, DOI: 10.3390/polym11111742, Vol.11, No.1742, pp.1-18, 2019

Abstract:
Each year, new glaucoma drug delivery systems are developed. Due to the chronic nature of the disease, it requires the inconvenient daily administration of medications. As a result of their elution from the eye surface and penetration to the bloodstream through undesired permeation routes, the bioavailability of active compounds is low, and systemic side effects occur. Despite numerous publications on glaucoma drug carriers of controlled drug release kinetics, only part of them consider drug permeation routes and, thus, carriers’ location, as an important factor affecting drug delivery. In this paper, we try to demonstrate the importance of the delivery proximal to glaucoma drug targets. The targeted delivery can significantly improve drug bioavailability, reduce side effects, and increase patients’ compliance compared to both commercial and scientifically developed formulations that can spread over the eye surface or stay in contact with conjunctival sac. We present a selection of glaucoma drug carriers intended to be placed on cornea or injected into the aqueous humor and that have been made by advanced materials using hi-tech forming methods, allowing for effective and convenient sustained antiglaucoma drug delivery.

Keywords:
hydrogels, nanofibers, electrospinning, glaucoma, ophthalmology

9.Niemczyk-Soczyńska B., Gradys A., Kołbuk D., Krzton-Maziopa A., Sajkiewicz P., Crosslinking Kinetics of Methylcellulose Aqueous Solution and Its Potential as a Scaffold for Tissue Engineering, Polymers, ISSN: 2073-4360, DOI: 10.3390/polym11111772, Vol.11, No.1772, pp.1-17, 2019
Niemczyk-Soczyńska B., Gradys A., Kołbuk D., Krzton-Maziopa A., Sajkiewicz P., Crosslinking Kinetics of Methylcellulose Aqueous Solution and Its Potential as a Scaffold for Tissue Engineering, Polymers, ISSN: 2073-4360, DOI: 10.3390/polym11111772, Vol.11, No.1772, pp.1-17, 2019

Abstract:
Thermosensitive, physically crosslinked injectable hydrogels are in the area of interests of various scientific fields. One of the representatives of this materials group is an aqueous solution of methylcellulose. At ambient conditions, methylcellulose (MC) is a sol while on heating up to 37 °C, MC undergoes physical crosslinking and transforms into a gel. Injectability at room temperature, and crosslinkability during subsequent heating to physiological temperature raises hopes, especially for tissue engineering applications. This research work aimed at studying crosslinking kinetics, thermal, viscoelastic, and biological properties of MC aqueous solution in a broad range of MC concentrations. It was evidenced by Differential Scanning Calorimetry (DSC) that crosslinking of MC is a reversible two-stage process, manifested by the appearance of two endothermic effects, related to the destruction of water cages around methoxy groups, followed by crosslinking via the formation of hydrophobic interactions between methoxy groups in the polymeric chains. The DSC results also allowed the determination of MC crosslinking kinetics. Complementary measurements of MC crosslinking kinetics performed by dynamic mechanical analysis (DMA) provided information on the final storage modulus, which was important from the perspective of tissue engineering applications. Cytotoxicity tests were performed using mouse fibroblasts and showed that MC at low concentration did not cause cytotoxicity. All these efforts allowed to assess MC hydrogel relevance for tissue engineering applications.

Keywords:
methylcellulose, thermosensitive hydrogel, crosslinking kinetics, DSC, DMA, cellular tests

10.Budnicka M., Szymaniak M., Kołbuk D., Ruśkowski P., Gadomska-Gajadhur A., Biomineralization of poly-l-lactide spongy bone scaffolds obtained by freeze-extraction method, Journal of Biomedical Materials Research Part B: Applied Biomaterials, ISSN: 1552-4973, DOI: 10.1002/jbm.b.34441, pp.1-12, 2019
Budnicka M., Szymaniak M., Kołbuk D., Ruśkowski P., Gadomska-Gajadhur A., Biomineralization of poly-l-lactide spongy bone scaffolds obtained by freeze-extraction method, Journal of Biomedical Materials Research Part B: Applied Biomaterials, ISSN: 1552-4973, DOI: 10.1002/jbm.b.34441, pp.1-12, 2019

Abstract:
Implants in the form of polymer scaffolds are commonly used to regenerate bone tissue after traumas or tooth extractions. However, few implant formation methods enable building polymer scaffolds allowing to reconstruct larger bone losses without immune response. Spacious, porous poly-l-lactide implants with considerable volume were obtained using the phase inversion method with the freeze-extraction variant. The calcium phosphate (CaP) coating was deposited on implant surfaces with the biomimetic method to improve the implant's osteoconductivity. The substitues morphology was characterized-porosity, size and shape of pores; mechanical properties, mass absorbability of implants before and after mineralization. The characteristics were provided with scanning electron microscopy (SEM), static compression test and hydrostatic weighing, respectively. The presence of CaPs in the entire volume of the implant was confirmed with SEM and infrared spectroscopy with Fourier transform (FTIR). The biocompatibility of scaffolds was confirmed with in vitro quantitative test and microscopic observations. The obtained results show that the implants can be used in tissue engineering as a vehicle of platelet-rich plasma to regenerate critical spongy bone losses.

Keywords:
bone graft, calcium phosphate(s), cell culture

11.Jenczyk P., Gawrońska M., Dera W., Chrzanowska-Giżyńska J., Denis P., Jarząbek D.M., Application of SiC particles coated with a protective Ni layer for production of Ni/SiC co-electrodeposited composite coatings with enhanced tribological properties, CERAMICS INTERNATIONAL, ISSN: 0272-8842, DOI: 10.1016/j.ceramint.2019.08.063, Vol.45, pp.23540-23547, 2019
Jenczyk P., Gawrońska M., Dera W., Chrzanowska-Giżyńska J., Denis P., Jarząbek D.M., Application of SiC particles coated with a protective Ni layer for production of Ni/SiC co-electrodeposited composite coatings with enhanced tribological properties, CERAMICS INTERNATIONAL, ISSN: 0272-8842, DOI: 10.1016/j.ceramint.2019.08.063, Vol.45, pp.23540-23547, 2019

Abstract:
In this paper, the mechanical properties of composites consisting of electroplated Ni and co-electrodeposited SiC particles, coated with a thin protective layer of Ni, were studied. The protective layer was on the SiC particles prior to adding them to the electrolyte bath. It was demonstrated that due to the application of the protective layer it was possible to decrease sliding friction force, and improve the wear resistance, of the composite coatings in comparison with standard electroplated composite coatings made of Ni and co-electrodeposited pure SiC particles. Coating SiC particles with Ni was achieved by means of a PVD process. The main advantage of this step is avoiding oxidation of the surface of the particles during the contact with an electrolyte. Particles protected from oxidation lead to stronger interfacial bonding between the matrix and the reinforcement. Furthermore, better bonding protects the SiC particles from being extracted from the matrix by a counter-probe during friction and wear tests. The influence of the particle's concentration is studied. A smaller friction force and constant wear rate was observed.

Keywords:
Wear, Friction, Interfacial bonding strength, Metal matrix composites, Silicon carbide, Electrodeposited nickel

12.Misztal-Faraj B., Pęcherski R.B., Denis P., Jarecki L., Modeling of oriented crystallization kinetics of polymers in the entire range of uniaxial molecular orientation, POLYMER, ISSN: 0032-3861, DOI: 10.1016/j.polymer.2019.04.037, Vol.173, pp.141-157, 2019
Misztal-Faraj B., Pęcherski R.B., Denis P., Jarecki L., Modeling of oriented crystallization kinetics of polymers in the entire range of uniaxial molecular orientation, POLYMER, ISSN: 0032-3861, DOI: 10.1016/j.polymer.2019.04.037, Vol.173, pp.141-157, 2019

Abstract:
Closed-form analytical formulas describing kinetics of oriented crystallization under constant or variable amorphous orientation and isothermal or non-isothermal conditions are derived, valid in the whole range of orientation. Master relation for the deformation free energy vs. orientation factor, or tensile stress, is derived accounting for non-linear effects of finite chain extensibility. The Avrami-Evans model is expanded to account for the effects of orientation in thermodynamic driving force of nucleation and crystal growth. Involvement of predetermined and spontaneous nucleation varies strongly with the orientation and leads to domination of spontaneous nucleation at high orientations. Crystallization half-time involving separated or coexisting predetermined and spontaneous nucleation is discussed. A formula predicting equal contribution of both nucleation modes vs. orientation factor and temperature is derived and ranges of domination of the modes are discussed. Example computations illustrate the model predictions for an example polymer (PLLA) and are in good agreement with the experimental results.

Keywords:
Amorphous orientation, Oriented crystallization kinetics, Nucleation rate

13.Chlanda A., Oberbek P., Heljak M., Górecka Ż., Czarnecka K., Chen K.-S., Woźniak M.J., Nanohydroxyapatite adhesion to low temperature plasma modified surface of 3D-printed bone tissue engineering scaffolds - qualitative and quantitative study, SURFACE AND COATINGS TECHNOLOGY, ISSN: 0257-8972, DOI: 10.1016/j.surfcoat.2019.07.070, Vol.375, pp.637-644, 2019
Chlanda A., Oberbek P., Heljak M., Górecka Ż., Czarnecka K., Chen K.-S., Woźniak M.J., Nanohydroxyapatite adhesion to low temperature plasma modified surface of 3D-printed bone tissue engineering scaffolds - qualitative and quantitative study, SURFACE AND COATINGS TECHNOLOGY, ISSN: 0257-8972, DOI: 10.1016/j.surfcoat.2019.07.070, Vol.375, pp.637-644, 2019

Abstract:
Biodegradable 3D-printed polycaprolactone scaffolds for bone tissue engineering applications have been extensively studied as they can provide an attractive porous architecture mimicking natural bone, with tunable physical and mechanical properties enhancing positive cellular response. The main drawbacks of polycaprolactone-based scaffolds, limiting their applications in tissue engineering are: their hydrophobic nature, low bioactivity and poor mechanical properties compared to native bone tissue. To overcome these issues, the surface of scaffolds is usually modified and covered with a ceramic layer. However, a detailed description of the adhesion forces of ceramic particles to the polymer surface of the scaffolds is still lacking. Our present work is focused on obtaining PCL-based composite scaffolds to strengthen the architecture of the final product. In this manuscript, we report qualitative and quantitative evaluation of low temperature plasma modification followed by detailed studies of the adhesion forces between chemically attached ceramic layer and the surface of polycaprolactone-nanohydroxyapatite composite 3D-printed scaffolds. The results suggest modification-dependent alteration of the internal structure and morphology, as well as mechanical and physical scaffold properties recorded with atomic force microscopy. Moreover, changes in the material surface were followed by enhanced adhesion forces binding the ceramic layer to polymer-based scaffolds.

Keywords:
Surface modification, Low temperature plasma, Atomic force microscopy, Bone tissue engineering

14.Oberbek P., Kozikowski P., Czarnecka K., Sobiech P., Jakubiak S., Jankowski T., Inhalation exposure to various nanoparticles in work environment—contextual information and results of measurements, Journal of Nanoparticle Research, ISSN: 1388-0764, DOI: 10.1007/s11051-019-4651-x, Vol.21, No.222, pp.1-24, 2019
Oberbek P., Kozikowski P., Czarnecka K., Sobiech P., Jakubiak S., Jankowski T., Inhalation exposure to various nanoparticles in work environment—contextual information and results of measurements, Journal of Nanoparticle Research, ISSN: 1388-0764, DOI: 10.1007/s11051-019-4651-x, Vol.21, No.222, pp.1-24, 2019

Abstract:
Outside the wide range of potential benefits, the use of nanomaterials can endanger human health, mostly through skin contact and the risk of inhalation. This article presents the results of harmonized measurements with contextual information on the emission of nanoparticles during the manufacturing and application of nanotechnology products. The purpose of the research was to investigate the actual levels of exposure to nano-objects in real working conditions in chosen Polish companies. Measurements were carried out in various workplaces: during silver nanoparticle synthesis, production of thin nanocarbon layers, 3D-printing with the use of a nanohydroxyapatite-polymer composite and the production of special seals from thin glass foils. Research was conducted on the basis of task-based measurements and offline microscopic analysis. Real-time particle DiSCmini counters were used to determine the nano-object concentration during different processes and events: samplers for collecting air dust, and a scanning electron microscope to confirm the presence of nanoparticles emitted from selected sources. Average particle sizes obtained with analysis of microscopic images were as follows: 46.7 ± 13.4 nm, 19.8 ± 4.8 nm, 22.4 ± 7.6 nm, 49.2 ± 26.3 nm respectively for workplaces. The concentration during significant events was referred to the background particle level. During one of the repeated processes, an unexpected and extremely high nanoparticle emission was recorded, which, in the long run, could cause a health hazard to workers. The studies have shown the importance of collective protective measures, revealed unexpected sources of accidentally generated nanoparticles and allowed to obtain knowledge about levels of exposure to nanoparticles during the various processes.

Keywords:
Nanoparticles, Ultrafine particles, Occupational exposure, Field monitoring, Occupational health, Real-time measurement

15.Zaszczyńska A., Sajkiewicz P., Gradys A., Kołbuk D., Urbanek O., Cellular studies on piezoelectric polyvinylidene fluoride nanofibers subjected to ultrasounds stimulations, ENGINEERING OF BIOMATERIALS / INŻYNIERIA BIOMATERIAŁÓW, ISSN: 1429-7248, Vol.XXII, No.153, pp.25-25, 2019