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Polyacrylate acid

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https://www.readbyqxmd.com/read/28327587/in-situ-characterization-of-the-initial-effect-of-water-on-molecular-interactions-at-the-interface-of-organic-inorganic-hybrid-systems
#1
Sven Pletincx, Lena Trotochaud, Laura-Lynn Fockaert, Johannes M C Mol, Ashley R Head, Osman Karslıoğlu, Hendrik Bluhm, Herman Terryn, Tom Hauffman
Probing initial interactions at the interface of hybrid systems under humid conditions has the potential to reveal the local chemical environment at solid/solid interfaces under real-world, technologically relevant conditions. Here, we show that ambient pressure X-ray photoelectron spectroscopy (APXPS) with a conventional X-ray source can be used to study the effects of water exposure on the interaction of a nanometer-thin polyacrylic acid (PAA) layer with a native aluminum oxide surface. The formation of a carboxylate ionic bond at the interface is characterized both with APXPS and in situ attenuated total reflectance Fourier transform infrared spectroscopy in the Kretschmann geometry (ATR-FTIR Kretschmann)...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28322540/a-rapid-recovery-double-crosslinking-hydrogel-with-stable-mechanical-properties-and-high-resilience-triggered-by-visible-light
#2
Longxiang Zhu, Jianhui Qiu, Eiichi Sakai, Kazushi Ito
The designed tough hydrogels, depending on energy dissipation mechanism, possess excellent biocompatibility, stimuli-responsiveness and outstanding mechanical properties. However, the application of hydrogels are greatly limited in actuators and sensors for the lack of instantaneous recovery and resilience. In this work, we synthesized a double crosslinking polyacrylic acid hydrogel via a simple, one-pot, visible-light-trigger polymerization, where carboxymethyl cellulose as initiator and the first cross-linker, N,N'-methylene bisacrylamide (MBA) as the second cross-linker...
March 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28320261/rheological-and-sensory-properties-of-hydrophilic-skin-protection-gels-based-on-polyacrylates
#3
Agnieszka Kulawik-Pióro, Joanna Kurpiewska, Agnieszka Kułaszka
INTRODUCTION: With the current increases in occupational skin diseases, literature data attesting the decreasing efficiency of barrier creams with respect to the manufacturer's declarations, and legal regulations granting skin protection gels for employees, research is required to analyse and evaluate the recipes used for hydrophilic skin protection gels based on polyacrylates. METHODS: This study investigated the rheological properties, pH, and sensory perception of hydrophilic barrier gels based on polyacrylates...
March 21, 2017: International Journal of Occupational Safety and Ergonomics: JOSE
https://www.readbyqxmd.com/read/28316987/selective-removal-of-hemoglobin-from-blood-using-hierarchical-copper-shells-anchored-to-magnetic-nanoparticles
#4
Youxun Liu, Yaokun Wang, Mingyang Yan, Juan Huang
Hierarchical copper shells anchored on magnetic nanoparticles were designed and fabricated to selectively deplete hemoglobin from human blood by immobilized metal affinity chromatography. Briefly, CoFe2O4 nanoparticles coated with polyacrylic acid were first synthesized by a one-pot solvothermal method. Hierarchical copper shells were then deposited by immobilizing Cu(2+) on nanoparticles and subsequently by reducing between the solid CoFe2O4@COOH and copper solution with NaBH4. The resulting nanoparticles were characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectrometry, X-ray photoelectron spectroscopy, and vibrating sample magnetometry...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28274489/re-mineralizing-dentin-using-an-experimental-tricalcium-silicate-cement-with-biomimetic-analogs
#5
Xin Li, Jan De Munck, Kumiko Yoshihara, Mariano Pedano, Kirsten Van Landuyt, Zhi Chen, Bart Van Meerbeek
OBJECTIVES: To characterize the re-mineralization potential of an experimental zirconium oxide (ZrO2) containing tricalcium silicate (TCS) cement, TCS 50, with the incorporation of biomimetic analogs at demineralized dentin. METHODS: Class-I cavities were prepared in non- carious human third molars. The dentin cavities were demineralized using a pH-cycling protocol, involving 50 cyclic immersions in pH-4.8 and pH-7 baths for 0.5h and 2.5h, successively. The cavities were filled with TCS 50 with/without biomimetic analogs (3% polyacrylic acid, 8% sodium trimetaphosphate) being added to the mixed TCS 50 cement prior to application...
March 5, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28263023/gold-nanoparticles-based-solid-phase-microextraction-coatings-for-determining-organochlorine-pesticides-in-aqueous-environmental-samples
#6
Adrián Gutiérrez-Serpa, Priscilla Rocío-Bautista, Verónica Pino, Francisco Jiménez-Moreno, Ana I Jiménez-Abizanda
The use of solid-phase microextraction coatings based on gold nanoparticles was investigated, focusing the attention on the preparation of nanoparticles with non-classical reduction agents of HAuCl4 such as gallic acid and H2 O2 , rather than the conventional sodium citrate. All nanoparticles were characterized by diode array spectroscopy, whereas novel nanoparticles prepared with gallic acid and H2 O2 were also characterized by microscopic techniques. Solid-phase microextraction coatings were prepared with a layer-by-layer approach...
March 6, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28256055/solvent-free-method-for-the-determination-of-lignin-derived-phenols-in-sediments
#7
Mayara Pinto, Morgana Frena, Luiz Augusto Dos Santos Madureira
A solvent-free method that uses headspace solid-phase microextraction and gas chromatography with flame ionization detection is proposed for the determination of lignin-derived phenols in sediments. The extraction and derivatization conditions for the simultaneous analysis of acetosyringone, acetovanillone, syringaldehyde, vanillin, ferulic acid, syringic acid, vanillic acid, p-hydroxybenzoic acid and p-coumaric acid were optimized using a central composite design. After optimization, the best results were obtained with the following conditions: exposure of the polyacrylate fiber to the headspace with 60 μL of N,O-bis(trimethylsilyl)trifluoroacetamide as a derivatizing agent for 15 min and then extraction in the headspace of 100 mg of sediment (previously spiked with lignin-derived phenols) for 35 min...
March 3, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28252022/simultaneous-removal-of-atrazine-and-copper-using-polyacrylic-acid-functionalized-magnetic-ordered-mesoporous-carbon-from-water-adsorption-mechanism
#8
Yaoyu Zhou, Fengfeng Zhang, Lin Tang, Jiachao Zhang, Guangming Zeng, Lin Luo, Yuanyuan Liu, Pei Wang, Bo Peng, Xiaocheng Liu
Highly efficient simultaneous removal of atrazine and Cu(II) was accomplished using synthesized polyacrylic acid-functionalized magnetic ordered mesoporous carbon (P-MMC) as compared to magnetic ordered mesoporous carbon (MMC) and ordered mesoporous carbon (OMC). The mutual effects and interactive mechanism of their adsorption onto P-MMC were investigated systematically by binary, preloading and thermodynamic adsorption procedures. In both binary and preloading systems, the adsorption of atrazine was inhibited to some extent by the presence of Cu(II) because of selective recognition and direct competition, but the presence of atrazine had negligible effect on Cu(II) desorption...
March 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28248076/multifunctional-theranostic-agent-of-cu2-oh-po4-quantum-dots-for-photoacoustic-image-guided-photothermal-photodynamic-combination-cancer-therapy
#9
Wei Guo, Zhenyu Qiu, Chongshen Guo, Dandan Ding, Tianchan Li, Fei Wang, Jianzhe Sun, Nannan Zheng, Shaoqin Liu
Image-guided phototherapy is considered to be a prospective technique for cancer treatment because it can provide both oncotherapy and bioimaging, thus achieving an optimized therapeutic efficacy and higher treatment accuracy. Compared to complicated systems with multiple components, using a single material for this multifunctional purpose is preferable. In this work, we strategically fabricated poly(acrylic acid)- (PAA-) coated Cu2(OH)PO4 quantum dots [denoted as Cu2(OH)PO4@PAA QDs], which exhibit a strong near-infrared photoabsorption ability...
March 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28230077/cartilage-like-electrostatic-stiffening-of-responsive-cryogel-scaffolds
#10
G S Offeddu, I Mela, P Jeggle, R M Henderson, S K Smoukov, M L Oyen
Cartilage is a structural tissue with unique mechanical properties deriving from its electrically-charged porous structure. Traditional three-dimensional environments for the culture of cells fail to display the complex physical response displayed by the natural tissue. In this work, the reproduction of the charged environment found in cartilage is achieved using polyelectrolyte hydrogels based on polyvinyl alcohol and polyacrylic acid. The mechanical response and morphology of microporous physically-crosslinked cryogels are compared to those of heat-treated chemical gels made from the same polymers, as a result of pH-dependent swelling...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28223195/cell-stress-response-to-two-different-types-of-polymer-coated-cobalt-ferrite-nanoparticles
#11
Jasna Lojk, Klemen Strojan, Katarina Miš, Boštjan Vladimir Bregar, Iva Hafner Bratkovič, Maruša Bizjak, Sergej Pirkmajer, Mojca Pavlin
Potential nanoparticle (NP) toxicity is one of crucial problems that limit the applicability of NPs. When designing NPs for biomedical and biotechnological applications it is thus important to understand the mechanisms of their toxicity. In this study, we analysed the stress responses of previously designed polyacrylic acid (PAA) and polyethylenimine (PEI) coated NPs on primary human myoblasts (MYO) and B16 mouse melanoma cell line. Negatively charged PAA did not induce cell toxicity, reactive oxygen species (ROS) or activate the transcription factor NF-κB in either cell line even at high concentrations (100μg/ml)...
March 15, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28210914/comparison-of-histopathological-characteristics-of-polyacrylate-polyalcohol-copolymer-with-dextranomer-hyaluronic-acid-after-injection-beneath-the-bladder-mucosa-layer-a-rabbit-model
#12
Abdol-Mohammad Kajbafzadeh, Shabnam Sabetkish, Reza Khorramirouz, Nastaran Sabetkish
OBJECTIVES: To compare short- and long-term local tissue reaction of polyacrylate polyalcohol copolymer (PPC) with dextranomer/hyaluronic acid (DHA) in rabbits. METHODS: Eight healthy New Zealand rabbits were randomly divided into two groups. In group I (control group), DHA was injected just beneath the mucosal layer of the bladder wall, while PPC was injected in group II. Subcutaneous injection of both bulking agents was also performed in nude mice. Histological evaluations with leukocyte common antibody (LCA), CD68, CD31, and CD34 were conducted on biopsies 1 and 6 months postoperatively...
February 16, 2017: International Urology and Nephrology
https://www.readbyqxmd.com/read/28197592/photonic-nanorods-with-magnetic-responsiveness-regulated-by-lattice-defects
#13
Huiru Ma, Kai Tang, Wei Luo, Lin Ma, Qian Cui, Wei Li, Jianguo Guan
Herein, we use experiments and numerical simulations to demonstrate a novel class of magnetically responsive photonic crystals (MRPCs) based on photonic nanorods which exhibit multiple optical properties in a magnetic field (H) due to their fixed photonic nanorods and H-tunable lattice defects. As an example, superparamagnetic Fe3O4@polyvinyl pyrrolidone (PVP)@SiO2 photonic nanorods were fabricated through a polyacrylic acid-catalysed hydrolysis-condensation reaction of γ-mercaptopropyltrimethoxysilane around chain-like PC templates formed by monodispersed Fe3O4@PVP particles under H...
February 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/28196394/synthesis-and-evaluation-of-a-triblock-copolymer-zno-nanoparticles-from-poly-%C3%AE%C2%B5-caprolactone-and-poly-acrylic-acid-as-a-potential-drug-delivery-carrier
#14
Lida Ahmadkhani, Ali Baghban, Shahram Mohammadpoor, Rovshan Khalilov, Abolfazl Akbarzadeh, Taras Kavetskyy, Siamak Saghfi, Aygun N Nasibova
Through the present paper, a triblock copolymer containing pH-responsive (polyacrylic acid-b-polycaprolactone -b-polyacrylic acid) (PAA-b-PCL-b-PAA) was synthesized by using the ring-opening polymerization (ROP) of ε-caprolactone (ε-CL) and the reversible addition fragmentation chain transfer (RAFT) polymerization of the acrylic acid methods, as the drug carrier. Blends of the nanocrystalline zinc oxide nanoparticles (n-ZnO) and triblock copolymer treated from the solution have been used to make the hybrid polymer-metal oxide for the preparation of the drug loaded nanocomposite...
February 14, 2017: Drug Research
https://www.readbyqxmd.com/read/28189036/corrigendum-to-polyethylenimine-polyacrylic-acid-nanocomposites-type-of-bonding-does-influence-the-gene-transfer-efficacy-and-cytotoxicity-colloids-surf-b-biointerfaces-140-2016-117-20
#15
S K Tripathi, Z Ahmadi, K C Gupta, P Kumar
No abstract text is available yet for this article.
February 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28166432/quantitative-histochemistry-for-macrophage-biodistribution-on-mice-liver-and-spleen-after-the-administration-of-a-pharmacological-relevant-dose-of-polyacrylic-acid-coated-iron-oxide-nanoparticles
#16
Daniela Rodrigues, Marisa Freitas, Vera Marisa Costa, Manuel Arturo Lopez-Quintela, José Rivas, Paulo Freitas, Félix Carvalho, Eduarda Fernandes, Paula Silva
Understanding in vivo biodistribution of iron oxide nanoparticles (IONs), and the involvement of the phagocyte system in this process, is crucial for the assessment of their potential health risk. In the present study, the histochemical expression of iron in liver and spleen sections of CD-1 mice (aged 8 weeks) was quantified, 24 h after intravenous administration of polyacrylic acid-coated IONs (PAA-coated IONs) (8, 20, 50 mg/kg). Organ sections were stained with Perls' Prussian blue for iron detection, followed by the quantification of iron deposition with ImageJ software...
March 2017: Nanotoxicology
https://www.readbyqxmd.com/read/28126393/cross-linked-pluronic-g-polyacrylic-acid-microgel-system-for-the-controlled-release-of-doxorubicin-in-pharmaceutical-formulations
#17
Y Tian, N Grishkewich, L Bromberg, T Alan Hatton, Kam C Tam
The binding of doxorubicin (DOX) to cross-linked Pluronic F127-g-PAA-EGDMA and L92-g-PAA-EGDMA microgels at different alpha (α) and salt concentrations was investigated using isothermal titration calorimetric (ITC), optical and scanning electron microscopic techniques (SEM). We seek to elucidate the mechanisms of interaction and the release of DOX from cross-linked microgels composed of Pluronic and poly(acrylic acid). The ITC results indicated a high binding affinity of DOX to the microgel, which is a function of salt concentrations due to the impact of electrostatic shielding on the DOX-binding process...
January 23, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28112652/effect-of-optimized-three-component-antiscalant-mixture-on-calcium-carbonate-scale-deposition
#18
Zhanhui Shen, Jialu Shi, Shuzhan Zhang, Jing Fan, JianSheng Li
The mixture of 1-hydroxyethane-1,1-diphosphonic acid (HEDP), and polyacrylic acid (PAA) and synthesized hydrolyzed polymaleic anhydride (HPMA) was optimized by using simplex lattice of Design-Expert software through calcium carbonate precipitation method. The optimum mass ratio of HEDP, PAA and synthesized HPMA was obtained at 10/10/80, which showed excellent performance on controlling calcium carbonate deposition. The antiscale efficiency of the optimum mixture was 84% and 95%, respectively, in the calcium carbonate precipitation test and the calcium carbonate scale deposit test...
January 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28099000/application-of-nano-fe-iii-tannic-acid-complexes-in-modifying-aqueous-acrylic-latex-for-controlled-release-coated-urea
#19
Yazhen Shen, Changwen Du, Jianmin Zhou, Fei Ma
Acrylic latexes are valuable waterborne materials used in controlled-release fertilizers. Controlled-release urea coated with these latexes releases a large amount of nutrients, making it difficult to meet the requirement of plants. Herein, Fe(III)-tannic acid (TA) complexes were blended with acrylic latex and subsequently reassembled on a surface of polyacrylate particles. These complexes remarkably retarded the release of urea (the preliminary solubility was decreased from 22.3 to 0.8%) via decreasing the coating tackiness (Tg was increased from 4...
January 30, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28098453/surface-engineered-multifunctional-eu-gd2o3-nanoplates-for-targeted-and-ph-responsive-drug-delivery-and-imaging-applications
#20
Arindam Saha, Subas Chandra Mohanta, Kashmiri Deka, Pritam Deb, Parukuttyamma Sujatha Devi
In this paper, we report the synthesis of surface-engineered multifunctional Eu:Gd2O3 triangular nanoplates with small size and uniform shape via a high-temperature solvothermal technique. Surface engineering has been performed by a one-step polyacrylate coating, followed by controlled conjugation chemistry. This creates the desired number of surface functional groups that can be used to attach folic acid as a targeting ligand on the nanoparticle surface. To specifically deliver the drug molecules in the nucleus, the folate density on the nanoparticle surface has been kept low...
February 1, 2017: ACS Applied Materials & Interfaces
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