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Polyacrylic acid

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https://www.readbyqxmd.com/read/29142881/smear-layer-removal-by-different-chemical-solutions-used-with-or-without-ultrasonic-activation-after-post-preparation
#1
Daniel Poletto, Ana Claudia Poletto, Andressa Cavalaro, Ricardo Machado, Leopoldo Cosme-Silva, Cássia Cilene Dezan Garbelini, Márcio Grama Hoeppner
Objectives: This study evaluated smear layer removal by different chemical solutions used with or without ultrasonic activation after post preparation. Materials and Methods: Forty-five extracted uniradicular human mandibular premolars with single canals were treated endodontically. The cervical and middle thirds of the fillings were then removed, and the specimens were divided into 9 groups: G1, saline solution (NaCl); G2, 2.5% sodium hypochlorite (NaOCl); G3, 2% chlorhexidine (CHX); G4, 11...
November 2017: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/29131605/poly-%C3%AF-methoxyalkyl-acrylate-s-a-nonthrombogenic-polymer-family-with-tunable-protein-adsorption
#2
Shingo Kobayashi, Miyuki Wakui, Yukihisa Iwata, Masaru Tanaka
A series of polyacrylates with different n-alkyl side chain lengths (one to six, and twelve carbons) and a ω-methoxy terminal group [poly(ω-methoxyalkyl acrylate): PMCxA] were prepared to study their nonthrombogenicity using human platelet adhesion, micro bicinchoninic acid (micro BCA) protein assay, and enzyme-linked immunosorbent assay (ELISA) tests. In all cases, human platelet adhesion was suppressed on the PMCxA coated substrates, and the number of human platelets adhered to the PMC3A [poly(3-methoxypropyl acrylate)] coated surface was comparable to that of commercialized nonthrombogenic coating agent poly(2-methoxyethyl acrylate) (PMEA, equal to PMC2A)...
November 13, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29127069/lectin-conjugated-ph-responsive-mesoporous-silica-nanoparticles-for-targeted-bone-cancer-treatment
#3
Marina Martínez-Carmona, Daniel Lozano, Montserrat Colilla, María Vallet-Regí
A novel multifunctional nanodevice based in doxorubicin (DOX)-loaded mesoporous silica nanoparticles (MSNs) as nanoplatforms for the assembly of different building blocks has been developed for bone cancer treatment. These building blocks consists of: i) a polyacrylic acid (PAA) capping layer grafted to MSNs via an acid-cleavable acetal linker, to minimize premature cargo release and provide the nanosystem of pH-responsive drug delivery ability; and ii) a targeting ligand, the plant lectin concanavalin A (ConA), able to selectively recognize, bind and internalize owing to certain cell-surface glycans, such as sialic acids (SA), overexpressed in given tumor cells...
November 7, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29102909/a-novel-and-efficient-method-on-the-recovery-of-nanosized-ceo2-in-ce-3-wastewater-remediation-using-modified-sawdust-as-adsorbent
#4
Shan Gao, Tiantian Luo, Qi Zhou, Wenjun Luo
In this study, by using heterogeneous esterification reaction and UV photo-induced technology, dendritic polyacrylic acid (PAA) was successfully grafted on to the surface of pinewood sawdust (PSD) particles to be used as an adsorbent and recovery medium for Ce(3+) from wastewater. 18 alkyl acid (stearic acid, SA), as a pre-modifier, was grafted onto the PSD surface. The outcome was the replacement of hydroxyl groups by hydrocarbon chains. Therefore, rich hydrogen atoms of the hydrocarbon chains on the PSD particles became sites whom can be taken away by photosensitizer molecules to form surface radicals...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29099794/hydrogel-film-immobilized-lactobacillus-brevis-rk03-for-%C3%AE-aminobutyric-acid-production
#5
Yi-Huang Hsueh, Wen-Chang Liaw, Jen-Min Kuo, Chi-Shin Deng, Chien-Hui Wu
Hydrogels of 2-hydroxyethyl methacrylate/polyethylene glycol diacrylate (HEMA/PEGDA) have been extensively studied for their use in biomedical and pharmaceutical applications owing to their nontoxic and highly hydrophilic characteristics. Recently, cells immobilized by HEMA/PEGDA hydrogels have also been studied for enhanced production in fermentation. Hydrogel films of HEMA/PEGDA copolymer were generated by Ultraviolet (UV)-initiated photopolymerization. The hydrogel films were used to immobilize viable Lactobacillus brevis RK03 cells for the bioconversion of monosodium glutamate (MSG) to γ-aminobutyric acid (GABA)...
November 3, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29099164/synthesis-and-characterization-of-an-injectable-and-hydrophilous-expandable-bone-cement-based-on-poly-methyl-methacrylate
#6
Zhao Yang, Lei Chen, Yuxin Hao, Yuan Zang, Xiong Zhao, Lei Shi, Yang Zhang, Yafei Feng, Chao Xu, Faqi Wang, Xinli Wang, Bowen Wang, Chenxin Liu, Yufei Tang, Zixiang Wu, Wei Lei
Poly(methyl methacrylate) (PMMA), the most common bone cement, has been used as a graft substitute in orthopedic surgeries such as vertebroplasty. However, an undesirable minor crack in the bone-cement interface provoked by shrinkage during polymerization and high elastic modulus of conventional PMMA bone cement dramatically increases the risk of vertebral body refracture postsurgery. Thus, herein, a hydrophilous expandable bone cement was synthesized based on a PMMA commercial cement (Mendec Spine Resin), acrylic acid (AA), and styrene (St)...
November 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29084177/a-highly-flexible-supercapacitor-based-on-mno%C3%A2-rgo-nanosheets-and-bacterial-cellulose-filled-gel-electrolyte
#7
Haojie Fei, Nabanita Saha, Natalia Kazantseva, Robert Moucka, Qilin Cheng, Petr Saha
The flexible supercapacitors (SCs) of the conventional sandwich-type structure have poor flexibility due to the large thickness of the final entire device. Herein, we have fabricated a highly flexible asymmetric SC using manganese dioxide (MnO₂) and reduced graphene oxide (RGO) nanosheet-piled hydrogel films and a novel bacterial cellulose (BC)-filled polyacrylic acid sodium salt-Na₂SO₄ (BC/PAAS-Na₂SO₄) neutral gel electrolyte. Apart from being environmentally friendly, this BC/PAAS-Na₂SO₄ gel electrolyte has high viscosity and a sticky property, which enables it to combine two electrodes together...
October 30, 2017: Materials
https://www.readbyqxmd.com/read/29080616/a-new-approach-for-development-of-vaccine-against-visceral-leishmaniasis-lipophosphoglycan-and-polyacrylic-acid-conjugates
#8
Adil M Allahverdiyev, Rabia Cakir Koc, Melahat Bagirova, Serhat Elcicek, Serap Yesilkir Baydar, Olga Nehir Oztel, Emrah Sefik Abamor, Sezen Canim Ates, Murat Topuzogullari, Sevil Isoglu Dincer, Zeynep Akdeste
OBJECTIVE: To determine the antileishmanial vaccine effectiveness of lipophosphoglycan (LPG) and polyacrylic acids (PAA) conjugates on in vivo mice models. METHODS: LPG molecule was isolated and purified from large-scale Leishmania donovani parasite culture. Protection efficacies of LPG alone, in combination with Freund's adjuvant, in a physical mixture and in conjugate (consisting of various LPG concentrations) with PAA, were comparatively determined by various techniques, such as cultivation with the micro-culture method, assessment of in vitro infection rates of peritoneal macrophages, determination of parasite load in liver with Leishman-Donovan Units, and detection of cytokine responses...
September 2017: Asian Pacific Journal of Tropical Medicine
https://www.readbyqxmd.com/read/29065833/on-the-importance-of-polyurethane-and-polyurea-nanosystems-for-future-drug-delivery
#9
Pau Rocas, Cristina Cuscó, Josep Rocas, Fernando Albericio
BACKGROUND: During the last decade, polyurethanes and polyureas (PUUa) have emerged as promising alternatives to classical polyacrylate-, polyester- and polyamino acid-based drug delivery nanosystems. Not only are polyurethanes and polyureas biocompatible and biodegradable, but they also facilitate the manufacture of nanoparticles of one order superior in size in quantitative yields. The versatile chemistry reduce the amount of organic solvents required and allows the straightforward multifunctionalization of polymer of these compounds helps to precursors with the desired targeting molecule at each stage of the process...
October 19, 2017: Current Drug Delivery
https://www.readbyqxmd.com/read/29039678/electrochemical-properties-of-sulfurized-polyacrylonitrile-cathode-for-lithium-sulfur-batteries-effect-of-polyacrylic-acid-binder-and-fluoroethylene-carbonate-additive
#10
Hee Min Kim, Jang-Yeon Hwang, Doron Aurbach, Yang-Kook Sun
Sulfurized carbonized polyacrylonitrile (S-CPAN) is a promising cathode material for Li-S batteries owing to the absence of polysulfide dissolution phenomena in the electrolyte solutions and thus the lack of a detrimental shuttle mechanism. However, challenges remain in achieving high performance at practical loading because of large volume expansion of S-CPAN electrodes and lithium anode degradation at high current densities. To mitigate this problem, we propose a novel cell design including poly(acrylic acid) (PAA) binder for improved integrity of the composite electrodes and fluoroethylene carbonate (FEC) as additive in the electrolyte solutions for stabilizing the lithium metal surface...
October 19, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29022639/glucose-oxidase-and-polyacrylic-acid-based-water-swellable-enzyme-polymer-conjugates-for-promoting-glucose-detection
#11
Jungyeon Ji, Han-Ik Joh, Yongjin Chung, Yongchai Kwon
Glucose oxidase (GOx) and polyacrylic acid (PAA) based water swellable non-toxic enzyme-polymer conjugate (PAA-GOx) was immobilized on a substrate consisting of graphene oxide (GO) and polyethyleneimine (PEI) (GO-PEI) and the electrochemical performances of the new catalyst were investigated. According to the measurements, although the amount of GOx immobilized on PAA-GOx was lower than that on glutaraldehyde (GA)-GOx, which is a conventionally used conjugate, its catalytic activity was 9.6 times higher than that of GA-GOx...
October 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28990335/next-generation-magnetic-nanocomposites-cytotoxic-and-genotoxic-effects-of-coated-and-uncoated-ferric-cobalt-boron-fecob-nanoparticles-in-vitro
#12
Katharina Netzer, Galateja Jordakieva, Angelika M Girard, Alexandra C Budinsky, Alexander Pilger, Lukas Richter, Nadezhda Kataeva, Joerg Schotter, Jasminka Godnic-Cvar, Peter Ertl
Metal nanoparticles (NPs) have unique physicochemical properties and a widespread application scope depending on their composition and surface characteristics. Potential biomedical applications and the growing diversity of novel nanocomposites highlight the need for toxicological hazard assessment of next-generation magnetic nanomaterials. Our study aimed to evaluate the cytotoxic and genotoxic properties of coated and uncoated ferric cobalt boron (FeCoB) NPs (5-15 nm particle size) in cultured human dermal fibroblasts (NHDFs)...
October 9, 2017: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/28972896/size-effect-on-oral-absorption-in-polymer-functionalized-mesoporous-carbon-nanoparticles
#13
Fu Ran, Wei Lei, Yu Cui, Jian Jiao, Yuling Mao, Shengyu Wang, Siling Wang
In this manuscript, the effect of the particle size of polymer-functionalized mesoporous carbon (MPP) nanoparticles on enhancing oral absorption of a water-insoluble drug is first investigated. The insoluble drug, fenofibrate (Fen), was selected as the model drug loaded in the MPP nanoparticles. MPP nanoparticles with different particle sizes were designed for improving the oral bioavailability of drugs, in which the branched polyethyleneimine (PEI) and polyacrylic acid (PAA) were modified on the surfaces of mesoporous carbon nanoparticles (MCNs) with amide bonds...
September 23, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28968132/nanorod-suprastructures-from-a-ternary-graphene-oxide-polymer-cspbx3-perovskite-nanocrystal-composite-that-display-high-environmental-stability
#14
Aizhao Pan, Matthew J Jurow, Fen Qiu, Juan Yang, Baoyi Ren, Jeffrey J Urban, Ling He, Yi Liu
Despite the exceptional optoelectronic characteristics of the emergent perovskite nanocrystals, the ionic nature greatly limits their stability, and thus restricts their potential applications. Here we have adapted a self-assembly strategy to access a rarely reported nanorod suprastructure that provide excellent encapsulation of perovskite nanocrystals by polymer-grafted graphene oxide layers. Polyacrylic acid-grafted graphene oxide (GO-g-PAA) was used as a surface ligand during the synthesis of the CsPbX3 perovskite nanocrystals (NCs), yielding particles (5-12 nm) with tunable halide compositions that were homogeneously embedded in the GO-g-PAA matrix...
October 4, 2017: Nano Letters
https://www.readbyqxmd.com/read/28952308/intramolecular-self-enhanced-nanochains-functionalized-by-an-electrochemiluminescence-reagent-and-its-immunosensing-application-for-the-detection-of-urinary-%C3%AE-2-microglobulin
#15
Hui-Yun Yang, Hai-Jun Wang, Cheng-Yi Xiong, Ya-Qin Chai, Ruo Yuan
In this study, polyethylenimine (PEI) is discovered to possess a noticeable amplification effect for the electrochemiluminescence (ECL) of N-(aminobutyl)-N-(ethylisoluminol) (ABEI); thus, a novel self-enhanced ECL reagent (ABEI-PEI) is prepared by covalent cross-linking. Because of the shortened electron-transfer path and reduced energy loss, the intramolecular ECL reaction between ABEI and PEI exhibited enhanced luminous efficiency compared with the traditional intermolecular ECL reaction. Owing to the amine-rich property of PEI, abundant ABEI could be immobilized on the molecular chains of PEI to strengthen the luminous intensity of ABEI-PEI...
October 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28927614/fast-microwave-assisted-green-synthesis-of-xanthan-gum-grafted-acrylic-acid-for-enhanced-methylene-blue-dye-removal-from-aqueous-solution
#16
Edwin Makhado, Sadanand Pandey, Philiswa N Nomngongo, James Ramontja
In the present project, graft polymerization was employed to synthesis a novel adsorbent using acrylic acid (AA) and xanthan gum (XG) for cationic methylene dye (MB(+)) removal from aqueous solution. The XG was rapidly grafted with acrylic acid (CH2=CHCOOH) under microwave heating. Fourier-transform infrared spectroscopy (FTIR), Proton Nuclear magnetic resonance spectroscopy ((1)H NMR), scanning electron microscopy (SEM), X-ray diffraction (XRD) and Thermal gravimetric analysis (TGA) techniques were used to verify the adsorbent formed under optimized reaction conditions...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917099/a-versatile-bio-based-material-for-efficiently-removing-toxic-dyes-heavy-metal-ions-and-emulsified-oil-droplets-from-water-simultaneously
#17
Daikun Li, Qing Li, Daoyong Mao, Ningning Bai, Hongzhou Dong
Developing versatile materials for effective water purification is significant for environment and water source protection. Herein, a versatile bio-based material (CH-PAA-T) was reported by simple thermal cross-linking chitosan and polyacrylic acid which exhibits excellent performances for removing insoluble oil, soluble toxic dyes and heavy metal ions from water, simultaneously. The adsorption capacities are 990.1mgg(-1) for methylene blue (MB) and 135.9mgg(-1) for Cu(2+), which are higher than most of present advanced absorbents...
December 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28887975/synthesis-of-silk-fibroin-g-paa-composite-using-h2o2-hrp-and-characterization-of-the-in-situ-biomimetic-mineralization-behavior
#18
Buguang Zhou, Min He, Ping Wang, Haitian Fu, Yuanyuan Yu, Qiang Wang, Xuerong Fan
Silk fibroin (SF) as a bioactive protein can offer growth substrates for hydroxyapatite (HAp) deposition. In the current work, graft copolymerization of acrylic acid (AA) onto fibroin chains was carried out using hydrogen peroxide-horseradish peroxidase (H2O2-HRP) catalytic system, SF-g-polyacrylic acid (PAA) membranes was prepared subsequently, followed by in situ biomimetic mineralization in the Ca/P solutions, aiming at promoting the deposition of HAp and endowing the fibroin-based biocomposite with enhanced bioactivity...
December 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28880381/evaluation-of-feasibility-of-1-5%C3%A2-tesla-prostate-mri-using-body-coil-rf-transmit-in-a-patient-with-an-implanted-vagus-nerve-stimulator
#19
Christopher P Favazza, Heidi A Edmonson, Chi Ma, Yunhong Shu, Joel P Felmlee, Robert E Watson, Krzysztof R Gorny
PURPOSE: To assess risks of RF-heating of a vagus nerve stimulator (VNS) during 1.5 T prostate MRI using body coil transmit and to compare these risks with those associated with MRI head exams using a transmit/receive head coil. METHODS: Spatial distributions of radio-frequency (RF) B1 fields generated by transmit/receive (T/R) body and head coils were empirically assessed along the long axis of a 1.5 T MRI scanner bore. Measurements were obtained along the center axis of the scanner and laterally offset by 15 cm (body coil) and 7 cm (head coil)...
September 7, 2017: Medical Physics
https://www.readbyqxmd.com/read/28834635/effects-of-the-formulations-of-silicon-based-composite-anodes-on-their-mechanical-storage-and-electrochemical-properties
#20
Birhanu Desalegn Assresahegn, Daniel Bélanger
In this work, the effects of the formulation of silicon-based composite anodes on their mechanical, storage, and electrochemical properties were investigated. The electrode formulation was changed through the use of hydrogenated or modified (through the covalent attachment of a binding additive such as polyacrylic acid) silicon and acetylene black or graphene sheets as conducting additives. A composite anode with a covalently grafted binder had the highest elongation without breakages and strong adhesion to the current collector...
October 23, 2017: ChemSusChem
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