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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 31 for “"Polyacrylic Acid"”.
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Reinforcement of Hydrogels via Polyacrylic Acid Nanoparticles Induced Calcium Carbonate Crystallization
… This was evaluated by producing a hydrogel from polyacrylic acid nanoparticles and then inducing crystallization of CaCO3 throughout the system. This system's loss and storage modulus was evaluated using rheologic frequency sweeps to determine how the material's properties change after the …
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A Study of the Polyacrylic Acid - Sodium Hydroxide System Using Thin-Film Dialysis
Polyacrylic acid is one of the simplest poly- carboxylic acids possible... The carboxyl protons are easily removed by titration with a base. This affords a readily available system for studies of polyelectrolyte properties. | Numerous examples exist in the literature of studies of the binding of …
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LIQUID PLASTICS AS A NEW ENVIRONMENTAL PROBLEM? AN INTEGRATED RISK ASSESSMENT OF POLYVINYL ALCOHOL, POLYETHYLENE GLYCOL, POLYVINYL PYRROLIDONE AND POLYACRYLIC ACID
… (PVP), polyethylene glycol (PEG), and polyacrylic acid (PAA)—using the freshwater fish Danio rerio and the crustacean Daphnia magna as model organisms. The impacts were assessed at multiple levels of biological organization, including molecular, cellular, physiological, organismal, and …
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Μελέτη στη συγκόλληση διαφόρων σύνθετων ρητινών μεταξύ τους
… 320 GRID PAPER, TREATED WITH 37% O-PHOSPHORIC ACID OR POLYACRYLIC ACID AND REPAIREDWITH THE NEW COMPOSITE RESIN. THE RESINS WERE REPAIRED WITH THE SAME ONES BUT ALSO THE SMALL PARTICLE ONE WITH THE HYBRID AND VICE VERSA AND THE TWO MICROFILLED WERE PAIRED BETWEEN THEM. SPECIMENS SAME IN …
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Effect of the fractionation and immobilization on the sorption properties of humanic acid
… soil components, aluminum oxide and humic acid, on the sorption behavior of 2,4-dichlorophenol under laboratory conditions selected to model the soil systems. Humic acid is very heterogeneous in terms of physical and chemical properties. To reduce the chemical heterogeneity of the extracted …
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Nickel powder precipitation by high-pressure hydrogen reduction
… were studied namely; a morphology modifier (a polyacrylic acid derivative) used as an additive and iron which is an inherent impurity.
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Microleakage in new resin-modified glass ionomer cements using new no-rinse conditioners : an in-vitro study
… with newly developed no-rinse conditioners or polyacrylic acid. Materials and methods: Standardized cavity preparations were made, centered on the cementoenamel junction of the buccal surface, on 96 extracted human molars divided in 8 groups (n = 12). G1 Ketac Nano with Ketac Nano Primer, G2 …
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Quantitative analysis and modeling of microembolic phenomena
… study focused on novel expandable/deformable Polyacrylic acid microspheres (PAA-MS) for use as catheter-deliverable therapeutic emboli. These emboli expand in aqueous media such as blood and remain unexpanded in custom delivery media. The techniques developed to investigate therapeutic …
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Surface modifications of iron oxide nanoparticles for biological applications
… size-monodispersity were synthesized with oleic acid as their native ligands. These hydrophobic and non-functionalized MPs have magnetic properties that are suitable for various biological applications. Surface modifications were studied for transferring these MPs into biological environments as …
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Untersuchungen zur Anbindung von Proteinen und Peptiden an Biomaterialien sowie zur Schädigung dieser Proteine und Peptide durch reaktive Sauerstoff-Spezies
… Si3N4 as well as to the surface of polylactic acid plastic film grafted with polyacrylic acid was examined: at the surface of TiAl6V4 and Si3N4 about 70 molecules of horse radish peroxidase per 1 µm² could be covalently bound, whereas to the grafted polylactic acid plastic film about 25*105 …
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Biological applications of weal polyelectrolyte multilayers
… were studied using three different polymers - polyacrylic acid (PAA), poly(allylamine hydrochloride) (PAH), polyacrylamide (PAAm). The first part of this thesis focuses on patterning polyelectrolyte multilayers found to resist mammalian cell adhesion, with ligands that promote specific …
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Effects of the polymeric binder system in slurry-based three dimensional printing of ceramics
… effects related to the polymeric binder system polyacrylic acid (PAA, MW 60000) and its interaction with the ceramic powder bed. Methods for retrieving structures characteristic of the minimum feature, referred to as the "binder primitive," and for characterizing the size and shape of the binder …
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Assembly and post-assembly manipulation of polyelectrolyte multilayers for control of bacterial attachment and viability
… (polyallylamine hydrochloride (PAH) and polyacrylic acid (PAA)) with distinct mechanical moduli (1-100 MPa). Once characterized, these PEMs showed that, under certain conditions, bacterial attachment correlated with increasing modulus. Thus, substrata stiffness was found to be an …
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Intercalation d'anions organiques dans des composés lamellaires de type hydrotalcite.
… of a series of long chain aliphatic dicarboxylic acids (HO$\sb2$C-(CH$\sb2)\rm\sb{p}$-CO$\sb2$H) with $\rm0\leq p\leq14$, in the interlayers of pyroaurite yielded lamellar organominerals characterized by an interlayer spacing between 9.7 A and 22.8 A. These d$\sb{001}$ values are indicative of a …
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Size and chemistry selective membranes from block polymer templates
… the PDMA interior may be deprotected to a polyacrylic acid (PAA) functionality. Facile amidation chemistry of these deprotected PI-PS-P(Acrylate) templates to PI-PS-PAA membranes demonstrates these devices are versatile in their tunable capacity for size and chemistry separation of target …
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Developement of Natural Multifunctional Cosmetic Ingredients Using Biotechnological Approach
… loss (TEWL) , skin erythema and skin topography. Polyacrylic acid hydrogel was used as a vehicle for GFEPS (1 % and 5% wlw), as well as for five other commercially available polysaccharides. The results have shown a significant increase in skin hydration produced by GFEPS. It also outperformed all …
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Design and Synthesis of Stimuli-Responsive Polymers with Programmable Cleavability
… approach to degradable polymers towards a polyacrylic acid system optimized for biodegradability. A computational model offers parameters for controlling degradation fragment molecular weight and dispersity that are validated experimentally, and the material performance properties of the …
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The physical properties, water sensitivity and long term durability performance of vegetal concrete
… straw), a linseed oil pre-treatment and a polyacrylic acid-based viscosity modifying admixture (VMA). The mixes were characterised regarding their bulk density, particle size distribution, water absorption, thermal and mechanical characteristics. The second part of the thesis is devoted to …
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Design of advanced reverse osmosis and nanofiltration membranes for water purification
… to avoid adsorption of foulants like humic acid. A layer of water-soluble polymer such as polyvinyl alcohol (PVA), polyacrylic acid (PAA), polyvinyl sulfate (PVS) or sulfonated poly(ether ether ketone) (SPEEK), was adsorbed onto the surface of a positively charged membrane. The resultant …
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