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Wyniki wyszukiwania dla: chitosan,%20platinum%20catalyst,%20carbonization
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Materiał węglowy ptrzymany na bazie karbonizowanego chitozanu domieszkowanego platyną = CARBON MATERIAL RECEIVED THROUGH CARBONIZATION OF CHITOSAN DOPED WITH PLATINUM
PublikacjaThe aim of this work was to investigate the impact of porous carbons with high nitrogen content onthe platinum catalyst performance properties. The system may be applied as well as cathodic catalyst for oxygenreduction in microbial fuel cells.We report a simple route for preparation of dispersed Platinum on the carbon support. Chitosan powder wasprotonated using aqueous solution of organic acid. The water from the pores was removed...
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A biofunctionalizable ink platform composed of catechol-modified chitosan and reduced graphene oxide/platinum nanocomposite
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Striking influence of NiO catalyst diameter on the carbonization of polypropylene into carbon nanomaterials and their high performance in the adsorption of oils
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Antimicrobial properties of chitosan solutions, chitosan films and gelatin-chitosan films
PublikacjaThe antimicrobial properties of chitosan solutions and films against selected bacteria and the effect of chitosan incorporation into gelatin films were studied. The bactericidal effect of chitosan solutions increased with time and temperature of sample incubation. Two psychrotrophic strains Pseudomonas fluorescens and Listeria innocua were more sensitive to chitosan than mesophilic strains Escherichia coli and Staphylococcus aureus....
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Striking Influence about HZSM-5 Content and Nickel Catalyst on Catalytic Carbonization of Polypropylene and Polyethylene into Carbon Nanomaterials
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Controllable Carbonization of Plastic Waste into Three-Dimensional Porous Carbon Nanosheets by Combined Catalyst for High Performance Capacitor
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Catalyzing Carbonization of Polypropylene Itself by Supported Nickel Catalyst during Combustion of Polypropylene/Clay Nanocomposite for Improving Fire Retardancy
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Crosslinking of Chitosan with Dialdehyde Chitosan as a New Approach for Biomedical Applications
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PLATINUM METALS REVIEW
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Chitosan-Based Membranes as Gentamicin Carriers for Biomedical Applications — Influence of Chitosan Molecular Weight
PublikacjaOver the past decade, much attention has been paid to chitosan as a potential drug carrier because of its non-toxicity, biocompatibility, biodegradability and antibacterial properties. The effect of various chitosan characteristics on its ability to carry different antibiotics is discussed in the literature. In this work, we evaluated the influence of the different molecular weights of this polymer on its potential as an antibacterial...
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Structure and Interactions in Chitosan Composites
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Recent progress in controlled carbonization of (waste) polymers
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WETTABILITY OF HYBRID CHITOSAN/PHOSPHOLIPID COATINGS
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Preparation and characterization of genipin cross-linked porous chitosan–collagen–gelatin scaffolds using chitosan–CO2 solution
PublikacjaNovel porous scaffolds composed of chitosan, collagen and gelatin were prepared by the multistep procedure involving final freeze-drying and characterized. To eliminate the need for residual acid removal from the material after drying, carbon dioxide saturation process was used for chitosan blend formulation. The use of CO2 for chitosan dissolution made the scaffold preparation process more reproducible and economically sustainable....
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Obtaining and Characterization of the PLA/Chitosan Foams with Antimicrobial Properties Achieved by the Emulsification Combined with the Dissolution of Chitosan by CO2 Saturation
PublikacjaA new method of obtaining functional foam material has been proposed. The materials were created by mixing the poly lactic acid (PLA) solution in chloroform, chitosan (CS) dissolved in water saturated with CO2 and polyethylene glycol (PEG), and freeze-dried for removal of the solvents. The composite foams were characterized for their structural (SEM, FT-IR, density, porosity), thermal (DSC), functional (hardness, elasticity, swelling...
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Obtaining and Characterization of the PLA/Chitosan Foams with Antimicrobial Properties Achieved by the Emulsification Combined with the Dissolution of Chitosan by CO2 Saturation
PublikacjaA new method of obtaining functional foam material has been proposed. The materials were created by mixing the poly lactic acid (PLA) solution in chloroform, chitosan (CS) dissolved in water saturated with CO2 and polyethylene glycol (PEG), and freeze-dried for removal of the solvents. The composite foams were characterized for their structural (SEM, FT-IR, density, porosity), thermal (DSC), functional (hardness, elasticity, swelling...
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Investigation of an elutable N-propylphosphonic acid chitosan derivative composition with a chitosan matrix prepared from carbonic acid solution
PublikacjaPorous chitosan composites using CO2 dissolution procedure and including water soluble N-propylphosphonic chitosan derivative (p-CHI) were obtained and characterized. In contrast to the control material, composites containing modified chitosan distinguished by a rapid moisture absorption and good adhesion to the skin. The FTIR analysis confirmed the presence of propylphosphonic group in the structure of the polymer. The porosity...
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The chitosan – Porphyrazine hybrid materials and their photochemical properties
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Customizing nano-chitosan for sustainable drug delivery
PublikacjaChitosan is a natural polymer with acceptable biocompatibility, biodegradability, and mechanical stability; hence, it has been widely appraised for drug and gene delivery applications. However, there has been no comprehensive assessment to tailor-make chitosan cross-linkers of various types and functionalities as well as complex chitosan-based semi- and full-interpenetrating networks for drug delivery systems (DDSs). Herein, various...
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Effect of transglutaminase on the solubility of chitosan-gelatin films
PublikacjaCelem pracy było zmniejszenie rozpuszczalności folii chitozanowo-żelatynowych w środowisku wodnym o różnym pH, poprzez usieciowanie składników przy użyciu transglutaminazy. Niemodyfikowane enzymatycznie folie rozpuszczały się w temperaturze pokojowej w 86 i 64% odpowiednio w buforze o pH 3 i 6. Ich rozpuszczalność została ograniczona do 19-23% po usieciowaniu polimerów enzymem w stężeniu 0.2mg/ml filmotwórczego roztworu. Enzymatycznie...
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Chitosan-based inks for 3D printing and bioprinting
PublikacjaThe advent of 3D-printing/additive manufacturing in biomedical engineering field has introduced great potential for the preparation of 3D structures that can mimic native tissues. This technology has accelerated the progress in numerous areas of regenerative medicine, especially led to a big wave of biomimetic functional scaffold developments for tissue engineering demands. In recent years, the introduction of smart bio-inks has...
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Chitosan-based nanomaterials for removal of water pollutants
PublikacjaThe rise of micropollutants presents a significant threat to both the environment and human well-being, requiring effective strategies for their mitigation. Chitin serves as the precursor for chitosan, composed of two monomers featuring acetamido and amino groups. Chitosan possesses several noteworthy attributes, including its ability to bind water and fat, humidity content, solubility, consistent molecular weight, and various...
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Structure of Small Platinum Clusters Revised
PublikacjaW pracy opisano wyniki obliczeń metodą DFT struktury 2-15 atomowych klastrów platyny.
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Biological properties of chitosan/Eudragit E 100 and chitosan/poly(4-vinylpyridine) coatings electrophoretically deposited on AgNPs-decorated titanium substrate
PublikacjaThe objective of the study was the determination of the response, in contact with human osteoblast-like MG-63 cells, of electrophoretically deposited coatings composed of chitosan (CS), Eudragit E 100 (EE100), or poly(4- vinylpyridine) (P4VP) on a silver nanoparticle (AgNPs)-decorated titanium substrate. Before deposition, the substrate was coated with silver by electro-reduction of silver nitrate. The coatings deposition was carried...
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Photosensitive chitosan for visible-light water pollutant degradation
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Kinetics of the crosslinking reaction between genipin and chitosan solutions
PublikacjaThe kinetics of the chitosan crosslinking reaction with genipin was examined. The strong relationship was found between crosslinking agent concentration, chitosan concentration, temperature and gelling time. Data obtained will be used in the proper selection of optimal genipin concentration for crosslinking chitosan solutions.
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Chitosan/Silk Fibroin Materials for Biomedical Applications—A Review
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The Characterization of Scaffolds Based on Dialdehyde Chitosan/Hyaluronic Acid
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BEHAVIOUR OF TiO2/CHITOSAN DISPERSION AS A FUNCTION OF SOLUTION pH
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Cytocompatibility, antibacterial, and corrosion properties of chitosan/polymethacrylates and chitosan/poly(4‐vinylpyridine) smart coatings, electrophoretically deposited on nanosilver‐decorated titania nanotubes
PublikacjaThe development of novel implants subjected to surface modification to achieve high osteointegration properties at simultaneous antimicrobial activity is a highly current problem. This study involved different surface treatments of titanium surface, mainly by electrochemical oxidation to produce a nanotubular oxide layer (TNTs), a subsequent electrochemical reduction of silver nitrate and decoration of a nanotubular surface with...
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Effects triggered by platinum nanoparticles on primary keratinocytes
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Cis-Dichloridobis(ethyldiphenylphosphine-ĸP)platinum(II)
PublikacjaTytułowy związek został otrzymany w reakcji K2PtCl4 z PEtPh2. Atom platyny wykazuje typową dla Pt(II) koordynację płasko-kwadratową. W powyższej metodzie otrzymuje się wyłącznie izomer cis. Upakowanie cząsteczek w krysztale wzmocnione jest poprzez słabe oddziaływania międzycząsteczkowe C-H...Cl.
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Platinum group elements: a challenge for environmental analytics
PublikacjaW pracy opisano problemy związane z analityką platynowców (Platinum Group Elements - PGE) w próbkach środowiskowych (kurz uliczny, materia zawieszona, gleba i osady denne, wody, ścieki, próbki biologiczne). Scharakteryzowano poszczególne etapy procedury analitycznej mogące być źródłem błędów oraz powodować szereg trudności. Opisano sposoby pobierania, przechowywania i utrwalania próbek przeznaczonych do badań. Przedstawiono również...
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Mechanism of MxOynanoparticles/CNTs for catalytic carbonization of polyethylene and application to flame retardancy
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An influence of molecular weight, deacetylation degree of chitosan xerogels on their antimicrobial activity and cytotoxicity. Comparison of chitosan materials obtained using lactic acid and CO2 saturation.
PublikacjaThis paper presents a comparison of the antimicrobial activity and cytotoxicity against L929 cells of chitosan xerogels prepared by dissolving the polymer in a solution of lactic acid (LA) or carbonic acid (CO2) and then freeze-drying. There was no simple relationship between the antimicrobial activity and cytotoxicity of the samples obtained using both techniques (LA and CO2). Chitosan materials obtained by the LA method in a...
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Heterogeneous Oxidation of Phenolic Compounds with Photosensitizing Catalysts Incorporated into Chitosan
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Chitosan as Valuable Excipient for Oral and Topical Carvedilol Delivery Systems
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The Application of Chitosan as a Modifier for Lubricating Greases Based on Vegetable Oil
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Chitosan, Collagen and Gelatin in the design of novel materials with antimicrobial acticity
PublikacjaMedical devices containing and releasing antiinfective agents directly on the site of injury are a common group of materials available and widely used in treating difficult to heal wounds. Sustained contact of the active agent to the damaged tissue, needed to inhibit infection and preservation of microbiological purity of the wound, is provided by the immobilization antimicrobial agents on the surface of the matrix material or...
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Antibacterial activity of gelatin-based films incorporated with chitosan or silver
PublikacjaFolie żelatynowe z dodatkiem srebra jonowego powodowały redukcję komórek Escherichia coli i Staphylococcus aureus o 90% pod powierzchnią folii. Nie obserwowano natomiast strefy zahamowania wzrostu dookoła krążków folii. W przypadku filmów chitozanowych lub żelatynowo-chitozanowych ich przeciwdrobnoustrojowa aktywność zależała od stopnia deacetylacji chitozanu.
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Synthesis and Physicochemical Characteristics of Chitosan-Based Polyurethane Flexible Foams
PublikacjaThe use of shrimp waste to obtain chitosan (Ch) is an essential issue, considering a circular economy, waste management, and its application to environmentally friendly materials. In this study, northern prawn shells were utilized to obtain Ch, which could then be used for synthesizing chitosan-based polyurethane (PUR+Ch) foams with different Ch concentration. The chemical structure, morphology, hardness, thermal properties, viscoelastic...
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CHARACTERISATION OF CHITOSAN/HYALURONIC ACID BLEND FILMS MODIFIED BY COLLAGEN
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Chitosan blends containing hyaluronic acid and collagen. Compatibility behaviour
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THE INFLUENCE OF THE TYPE SOLVENT ON THE STRUCTURE OF CHITOSAN BLENDS WITH HYALURONIC ACID
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Preparation and Surface Characterization of Chitosan-Based Coatings for PET Materials
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Chitosan-Based Nanoparticles as Effective Drug Delivery Systems—A review
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WETTABILITY OF CHITOSAN-MODIFIED AND LIPID/POLYPEPTIDE-COATED PEEK SURFACES
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cis-Dichloridobis(diethylphenylphosphine-kappa-P)platinum(II)
PublikacjaZwiązek [PtCl2(Et2PhP)2] został otrzymany w postaci krystalicznej i zbadany metodą rentgenowskiej analizy strukturalnej. W syntezie otrzymuje się izomer cis. Atom platyny wykazuje nieco zniekształconą koordynację płasko-kwadratową. Struktura krystaliczna jest dodatkowo stabilizowana przez słabe wewnątrz- i międzyczasteczkowe wiązania wodorowe typu C-H...Cl.
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Environmental Fate of Traffic-Derived Platinum Group Metals
PublikacjaCiągle wprowadzane standardy odnośne emisji gaz spalinowych determinują rozwój przemysłu motoryzacyjnego oraz stymulują poszukwianie nowych przyjaznych środowiskowo rozwiązań dla transportu drogowego. Jednym z takich rozwiązań było wprowadzenie konwerterów gazów spalinowych w pojazdach mechanicznych które zawierały metali z grupy platynowców (PGM). Obok niezaprzeczalnych korzyści, zastosowanie PGM w konwerterach spalin nie jest...
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Photophysics of electrophosphorescent platinum (II) porphyrin in solid films
PublikacjaW pracy badano elektronowe procesy w porfirynowym kompleksie platyny (PtOEP) umieszczonej w matrycy polimerowej lub w postaci warstw uzyskanych przez próżniowe naparowanie. Mierzono widma absorpcji i emisji oraz wykonano pomiary elektromodulowanej luminescencji i fotoprzewodnictwa. Przeprowadzono wszechstronną dyskusję własności stanów wzbudzenia elektronowego w PtOEP w kontekscie zastosowania tego związku w organicznych diodach...