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1
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HIGHLY SENSITIVE CHITOSAN-BASED OPTICAL FLUORESCENT SENSOR FOR GASEOUS METHYLAMINE DETECTION

100%
Mironenko A. Y., Sergeev A. A., Nazirov A. E., Voznesenskiy S. S., Bratskaya S. Y., Mirochnik A. G.
Progress on Chemistry and Application of Chitin and its Derivatives
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2017
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vol. 22
159-165
EN
An optical fluorescent sensor based on a chitosan thin film co-doped with Eu3+ and a bromothymol blue pH indicator has been developed. Near-UV to visible (350–400 nm) excitation of the europium (III) chelate complexes with 1,3-diphenyl-1,3-propanedione exhibits a typical lanthanide emission with maximum at 618 nm. Luminescent spectra of the Eu3+ complex were found to be insensitive to the presence of methylamine gas. Therefore, bromothymol blue, a non-fluorescent pH indicator with an absorbance maximum of deprotonated form close to the Eu3+ emission band was added to the film to provide a non-fluorescent reversible response to different methylamine concentrations, which can be detected by measuring the Eu3+ emission.
2
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Electrical Properties of BaCeO₃-Based Electrolytes for use in Dual Protonic Ceramic-Solid Oxide Fuel Cells

100%
Gawel R., Przybylski K.
Acta Physica Polonica A
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2017
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vol. 131
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issue 5
1361-1366
EN
Bulk samples consisting of BaCe_{0.85}Y_{0.15}O_{3-δ} (BCY15) and Ce_{0.85}Y_{0.15}O_{2-δ} (YDC15) compounds, mixed together in different ratios, were studied as potential electrolytes in dual protonic ceramic-solid oxide fuel cells and compared with non-composite BCY15 and YDC15. The microstructures of the sintered materials indicate that BCY15 exhibits the largest grains, whereas composites have greater visible porosity than the non-composite samples. From X-ray diffraction studies it follows that BCY15 and YDC15 consist mainly of one phase, whereas the composites are two-phase materials. Electrochemical impedance spectroscopy studies at different temperatures show that the composite materials are capable of conduction the order of 10¯³ S/cm at temperatures above 500°C in a hydrogen-containing atmosphere. Furthermore, activation energy values of the conductivity determined for the composites in air atmosphere are between those obtained for BCY15 (E_{a}=0.590±0.017 eV) and YDC15 (E_{a}=1.132±0.008 eV). From this it follows that both phases of the composites influence the electrical conductivity of the materials. In conclusion, BCY15 and the BCY15-YDC15 composites show promise for future use as electrolytes in dual protonic ceramic-solid oxide fuel cells.
3
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The Influence of the Forced Movement of Components on the Structure in Fabricated AlSi/CrxCy Composite Castings

100%
Dulęba A., Cholewa M., Scelina D.
Archives of Foundry Engineering
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2012
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issue 1
4
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Application of resistance change measurement method to evaluation of the degree of destruction in carbon composite

89%
Pyrzanowski P., Pyrzanowski P.
Archive of Mechanical Engineering
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2008
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vol. 55
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issue 2
5
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The Microstructure and Magnetoelectric Properties of Multiferroic Composites

88%
Bartkowska J. A., Bochenek D., Niemiec P.
Archives of Metallurgy and Materials
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2018
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vol. 63
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issue 2
6
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Multinanosensors Based on MWCNTs and Biopolymer Matrix - Production and Characterization

88%
Tomova A., Gentile G., Grozdanov A., Errico M., Paunović P., Avella M., Dimitrov A.
Acta Physica Polonica A
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2017
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vol. 132
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issue 4
1251-1255
EN
This study presents the results of the design and characterization of a gas sensor with PMMA/CNTs chemiresistor as sensing element for detection of organic vapors. Multi wall carbon nanotubes (MWCNTs) produced at our lab (by method of pyrolysis, outer diameter d=10÷40 nm, purity ≈94%) were incorporated into biocompatible polymer matrix. Poly(methyl methacrylate) - PMMA - and nanocomposite films were obtained using casting solution technique. Produced nanocomposite films were investigated with thermogravimetric analysis, differential scanning calorimetry, X-ray analysis, scanning electron microscopy, and Fourier transform infrared, while the sensors activity was determined by the changes in electrical resistance of the nanocomposite films due to acetone and chloroform exposure. The response to these vapors was evaluated and it was shown that PMMA/MWCNTs composites exhibit changes in electroresistivity. Sensitivity was calculated to be in 0.58-54.6 range (30 min exposed to acetone) and 0.53-10.35 (30 min exposed to chloroform). The results presented in this paper show that CNTs are able to improve the overall performances of polymer based sensors.
7
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Diacryloyl Derivative of Mannitol – Synthesis and Application in Gelcasting of Al2O3-ZrO2 Composites

75%
Pietrzak E., Antosik A., Wiecińska P., Kubica D., Sakowicz A., Prokurat N.
Archives of Metallurgy and Materials
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2018
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vol. 63
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issue 2
8
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CHARACTERISATION OF THIN CHITOSAN FILMS FOR GUIDED TISSUE REGENERATION PURPOSES

75%
Lewandowska K., Furtos G. F.
Progress on Chemistry and Application of Chitin and its Derivatives
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2017
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vol. 22
118-124
EN
The morphology and structure of thin films containing chitosan (Ch) with montmorillonite (MMT) were characterised by scanning electron microscopy (SEM), atomic force microscopy (AFM) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). Thin films of two chitosan samples and a composition of chitosan with montmorillonite were formed by casting methods from acetic acid solutions and were soaked in a simulated body fluid (SBF) solution at 37C for 14 days. The samples were compared before and after soaking. The obtained results showed growth of new phases containing calcium in all prepared films.
9
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SURFACE PROPERTIES OF CHITOSAN COMPOSITES WITH POLY(VINYL ALCOHOL) AND HYDROXYAPATITE

75%
Lewandowska K.
Progress on Chemistry and Application of Chitin and its Derivatives
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2015
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vol. 20
177-182
EN
Surface properties of composites containing chitosan (Ch), poly(vinyl alcohol) (PVA) with hydroxyapatite (HAP) were investigated by contact angle measurements and atomic force microscopy (AFM). Thin films of Ch/HAP and Ch/PVA/HAP composites have been formed by casting methods from acetic acid solutions. Measurements of the contact angle for diiodomethane (D), and glycerol (G) on the surface of chitosan films, Ch/HAP and chitosan/PVA/HAP films were made and surface free energy was calculated. It was found that chitosan/HAP or Ch/PVA/HAP blend surface is enriched in high surface energy component i.e. chitosan. The study of composites by AFM showed a completely different morphology when compared with unmodified components. The roughness of composites increase after the addition of hydroxyapatite. This may indicates a strong interaction between the polymeric components and inorganic additive.
10
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Densification and Mechanical Properties of 439L Steel Composites Blended with Fifteen Micron-Size Silicon Carbide Particles

75%
Lee S. W., Shin H., Rhee K. Y.
Archives of Metallurgy and Materials
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2019
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vol. 64
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issue 3
11
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The Mechanism of the Surface Alloy Layer Creation for Cast Steel

75%
Walasek A., Szajnar J.
Archives of Foundry Engineering
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2012
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issue 1
12
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Effect of Processing Conditions on Selected Properties of Polyamide 6 Composites Filled by Modified Bentonite

75%
Gnatowski A., Gołębski R., Stachowiak K., Gnatowski A., Gołębski R., Stachowiak K.
Archives of Metallurgy and Materials
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2021
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vol. 66
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issue 2
13
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Influence of mechanical alloying process on structural, mechanical and tribological behaviours of CNT reinforced aluminium composites – a statistical analysis

75%
Manikandan P., Elayaperumal A., Franklin Issac R., Manikandan P., Elayaperumal A., Franklin Issac R.
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2021
14
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NIR photoresponse in the mixed phthalocyanine films

63%
Pakhomov G., Kuzin E., Murel A.
Open Physics
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2006
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vol. 4
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issue 4
494-502
EN
The structure, optical and conducting properties of thin vacuum deposited films of erbium bisphthalocyanine (Pc2Er) and its mixtures with metal-free phthalocyanine (H2Pc) have been studied with particular reference to the near infrared (NIR). It has been found that, in spite of intense optical absorbance over the UV/Vis/NIR domain, pure Pc2Er films are weakly photoconductive. However, in the mixed Pc2Er/H2Pc films the photocurrent signal was detected in the NIR range of 1200–1500 nm, which is associated with optical activity of Pc2Er molecules.
15
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Ocena programu profilaktycznego zdrowia jamy ustnej u pacjentów niepełnosprawnych intelektualnie

63%
Paszyńska E., Jurga J., Dyszkiewicz-Konwińska M., Mehr K.
Pediatria i Medycyna Rodzinna
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2009
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vol. 5
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issue 4
271-275
EN
The purpose of the study was to evaluate the efficacy of the program by assessing the caries prevalence DMFT (decayed, missing and filled teeth) and periodontal status CPITN (community periodontal index of treatment needs) indices. Fissure sealant retention was also assessed in vivo. Material and method: Preventive program consisted of supervised tooth brushing twice a day, tooth brushing with Duraphat paste (Colgate-Palmolive, Poland Sp. z o.o.; concentration of fluoride 5000 ppm), on 10 occasions over a year and sealant application to sound posterior teeth. For fissure sealing two different materials: Fuji VII and Helioseal F, were used by means of a split-mouth model. Altogether 87 teeth were sealed in 15 female patients age 16 to 25. A full oral examination was carried out before initiating the program and after two years of its application. Results: The preliminary examination showed a high (8.24) mean DMFT, a high (52.08%) percentage of bleeding quadrants and 22.2% calculus presence. After this 2 year preventive program no caries was detected in the fissure sealed teeth and material was present in 90.7% of those sealed with Fuji VII and 83% with Helioseal F. Bleeding and calculus presence decreased to 42.8% and 20.8% respectively. Conclusions: A combination of topical fluoridation and fissure sealing appears to be an effective method of caries prevention in people with mental retardation.
PL
Celem badań była ocena skuteczności zastosowanego profilaktycznego programu zdrowia jamy ustnej oparta na badaniach stomatologicznych z zastosowaniem epidemiologicznych wskaźników próchnicy DMFT (wskaźnik intensywności próchnicy określający zapadalność na próchnicę – decayed, missing and filled teeth; polski skrót: PUWZ) i chorób przyzębia CPITN (wskaźnik periodontologicznych potrzeb leczniczych – community periodontal index of treatment needs). Ponadto założono porównanie retencji materiałów uszczelniających in vivo. Materiał i metoda: Zastosowano program profilaktyczny składający się z nadzorowanego szczotkowania zębów 2 razy dziennie, 10-krotnego w ciągu roku szczotkowania uzębienia pastą Duraphat (stężenie fluoru 5000 ppm) oraz uszczelnienia bruzd zdrowych zębów tylnych. Do uszczelnienia zastosowano 2 rodzaje materiałów: oparty na żywicy Helioseal F i cement szkłojonomerowy Fuji VII metodą split-mouth, które założono w 87 zębach. Programem zostało objętych 15 osób płci żeńskiej w wieku od 16 do 25 lat. Badanie stanu jamy ustnej przeprowadzono przed wdrożeniem programu, a podczas jego trwania badano biorących udział w 6-miesięcznych odstępach. Badanie końcowe przeprowadzono po okresie dwóch lat od wdrożenia działań profilaktycznych. Wyniki: Badanie wstępne wykazało wysoką wartość PUWZ (8,24) oraz wysoki odsetek kwadrantów z krwawieniem (52,08%) i obecnością kamienia nazębnego (22,02%). W ostatnim badaniu po okresie 2 lat nie stwierdzono w żadnym z uszczelnianych zębów wystąpienia zmian próchnicowych, a utrzymanie się materiału uszczelniającego wynosiło 90,7% w przypadku Fuji VII i 83% w zębach uszczelnionych Helioseal F. Zmniejszyło się krwawienie z dziąseł (42,8%) oraz występowanie kamienia nazębnego (20,8%). Wnioski: Zastosowany program profilaktyczny oraz laki szczelinowe skutecznie zapobiegają próchnicy u osób z niepełnosprawnością intelektualną.
16
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Studies of properties of polypropylene/halloysite composites

63%
Szczygielska A., Kijeński J.
Polish Journal of Chemical Technology
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2011
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vol. 13
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issue 3
61-65
EN
The results of the studies on the synthesis, mechanical and thermal properties of polypropylene composites with various amount of halloysite filler are presented. Halloysite (HNT) belongs to the silica type characterized by a two-layer 1:1 structure. This work was aimed to develop a method for the modification of halloysite in its prime use as a filler for polypropylene by extrusion. The composites contain 1, 3, 5 and 7 wt.% of HNT. The degree of crystallinity of the composites decrease with increasing halloysite content. The results confirm the expectations that composites of interesting physicochemical, mechanical and thermal properties can be obtained. The mechanical properties studied show that the filler modification method used leads to the synthesis of polymer composites of improved thermal and mechanical properties.
17
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Sound Radiation Characteristics of Acoustically Thick Composite Cylinders and Their Experimental Verification

63%
Josephine Kelvina Florence S., Renji K., Josephine Kelvina Florence S., Renji K.
Archives of Acoustics
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2021
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vol. 46
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issue 3
18
Content available remote

Biodegradable Polymer Composites with Nitrogen- and Phosphorus-Containing Waste Materials as the Fillers/Biodegradowalne Kompozyty Polimerowe Wypełnione Odpadami Zawierającymi Azot I Fosfor

51%
Treinyte J., Grazuleviciene V., Ostrauskaite J.
Ecological Chemistry and Engineering S
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2014
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vol. 21
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issue 3
515-528
EN
Composites consisting of polyvinyl alcohol, nitrogen- and phosphorus-containing waste materials were prepared and studied as materials for encapsulation of mineral fertilizers By-products of biodiesel production (rapeseed cake, crude glycerol), horn meal (waste product of haberdashery) and phosphogypsum (by-product of the production of phosphorus fertilizers) were used as the fillers of the composites. The films of the composites with the different amounts of nitrogen and phosphorus were prepared using different fillers or their mixtures. Mechanical, properties of the films, hygroscopicity, solubility in water were studied. The composites developed were used for the encapsulation of mineral fertilizers. It was established that encapsulation resulted in the increase of the time of release of the fertilizers. The developed slow-release fertilizers represent a combination of inorganic and organic compounds. The organic part consists of nitrogen- and phosphorus containing horn meal and rapeseed cake. Since assimilation of organic substances is considerably longer, nitrogen and phosphorus of these components will be available for plants much later than inorganic nitrogen and phosphorus. Thus the composite film will not only decrease the rate of desorption of the components from the granules of the fertilizers but will also prolong the impact of the fertilizers on the plants.
PL
Wytworzono materiały kompozytowe, składające się z alkoholu poliwinylowego, zawierające odpady z azotem i fosforem. Badano możliwości zastosowania tych materiałów do kapsułkowania nawozów mineralnych. Jako wypełniacze kompozytów były wykorzystywane produkty uboczne wytwarzania biopaliwa do silników wysokoprężnych (makuch rzepakowy, surowy glicerol), mączka rogowa (produkt odpadowy z produkcji pasmanteryjnej) i fosfogips (produkt uboczny produkcji nawozów fosforowych). Wytworzono folie kompozytowe z różnymi ilościami azotu i fosforu, różnymi wypełniaczami lub ich mieszaninami. Badano właściwości mechaniczne folii, ich higroskopijność i rozpuszczalność w wodzie. Otrzymane kompozyty zostały wykorzystane do kapsułkowania nawozów mineralnych. Stwierdzono, że kapsułkowanie spowodowało zwiększenie czasu uwalniania nawozów. Opracowane nawozy powolnego uwalniania stanowią kombinację związków nieorganicznych i organicznych. Organiczna część składa się z mączki rogowej i makucha rzepakowego, zawierających azot i fosfor. Ponieważ asymilacja substancji organicznych jest znacznie dłuższa, azot i fosfor z tych składników będą dostępne dla roślin znacznie później niż z substancji nieorganicznych. W ten sposób folia z kompozytu nie tylko zmniejszy szybkość desorpcji składników z granulek nawozów, ale również przedłuży wpływ nawozów na rośliny.
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