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Polyacrylate acid

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https://www.readbyqxmd.com/read/29241114/understanding-the-impact-of-cationic-polyacrylamide-on-anaerobic-digestion-of-waste-activated-sludge
#1
Dongbo Wang, Xuran Liu, Guangming Zeng, Jianwei Zhao, Yiwen Liu, Qilin Wang, Fei Chen, Xiaoming Li, Qi Yang
Previous investigations showed that cationic polyacrylamide (cPAM), a flocculant widely used in wastewater pretreatment and waste activated sludge dewatering, deteriorated methane production during anaerobic digestion of sludge. However, details of how cPAM affects methane production are poorly understood, hindering deep control of sludge anaerobic digestion systems. In this study, the mechanisms of cPAM affecting sludge anaerobic digestion were investigated in batch and long-term tests using either real sludge or synthetic wastewaters as the digestion substrates...
December 5, 2017: Water Research
https://www.readbyqxmd.com/read/29239079/smart-solid-electrolyte-interphase-layer-for-long-life-lithium-metal-anodes
#2
Nian-Wu Li, Yang Shi, Ya-Xia Yin, Xian-Xiang Zeng, Jin-Yi Li, Cong-Ju Li, Li-Jun Wan, Rui Wen, Yu-Guo Guo
Lithium (Li) metal is a promising anode material for high-energy density batteries. However, the unstable and static solid electrolyte interphase (SEI) can be destroyed by the dynamic Li plating/stripping behavior on the Li anode surface, leading to side reactions and Li dendrites growth. Herein, we design a smart Li polyacrylic acid (LiPAA) SEI layer with high stretchability to address the dynamic Li plating/stripping processes by the self-adapting interface regulation, which is demonstrated by in situ AFM process...
December 14, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29212330/gastric-mucus-and-mucuslike-hydrogels-thin-film-lubricating-properties-at-soft-interfaces
#3
Troels Røn, Navin J Patil, Fatemeh Ajalloueian, Sankaranarayanan Rishikesan, Bruno Zappone, Ioannis S Chronakis, Seunghwan Lee
Mucus is a viscous slime that plays a vital role in protecting and lubricating biological tissues, in particular, soft epithelium interfaces such as in the stomach, intestines, and esophagus. Previous attempts to generate mucus models that mimick or simulate its characteristics have been predominantly focused on the rheological properties. This study investigates both rheological and tribological shear properties of thin films of gastric mucus from a porcine source and its mimics at compliant soft interfaces...
December 5, 2017: Biointerphases
https://www.readbyqxmd.com/read/29211472/tuning-the-viscoelastic-gel-transition-of-single-wall-carbon-nanotubes-embedded-in-ph-responsive-polyelectrolyte-solutions
#4
Atiđa Selmani, Antonio Tavera-Vazquez, Cristina Garza, Rolando C Castillo
We present the detailed rheological changes that occur when small quantities of single-wall carbon nanotubes are dispersed in a polyacrylic acid water solution, around the overlap polymer concentration, up to the gel point. Here, pH is used to tune the gel formation. Suspensions of nanotubes at pH ≤ 5 are exfoliated and dispersed by the polymer. Contacts between the nanotubes are mainly through polymer entangling, and the suspension is viscoelastic. At pH > 5, the polymer is charged, and the solution is not so good solvent for the nanotubes anymore...
December 6, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29183857/understanding-the-generation-and-maintenance-of-supersaturation-during-the-dissolution-of-amorphous-solid-dispersions-using-modulated-dsc-and-1h-nmr
#5
Shrawan Baghel, Helen Cathcart, Niall J O'Reilly
In this study, the dissolution behaviour of dipyridamole (DPM) and cinnarizine (CNZ) spray-dried amorphous solid dispersions (ASDs) using polyvinyl pyrrolidone (PVP) and polyacrylic acid (PAA) as a carrier matrix were evaluated and compared. The drug concentrations achieved from the dissolution of PVP and PAA solid dispersions were significantly greater than the equilibrium solubility of crystalline DPM and CNZ in phosphate buffer pH 6.8 (PBS 6.8). The maximum drug concentration achieved by dissolution of PVP and PAA solid dispersions did not exceed the theoretically calculated apparent solubility of amorphous DPM and CNZ...
November 25, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29180764/synthesis-and-implication-of-novel-poly-acrylic-acid-nanosorbent-embedded-hydrogel-composite-for-lead-ion-removal
#6
Mayuri Bhatia, Satish Babu Rajulapati, Shirish Sonawane, Amandeep Girdhar
Lead stands second among the deadly heavy metal pollutants owing to the incompetent mechanism possessed by the human body for its removal. A polymeric hydrogel in the form of composite was prepared using acrylic acid (monomer) and novel nanofiller that possess super adsorbent properties with restricted gel seepage into flowing ionic liquid. The filler used is an adsorbent which is biocompatible, biodegradable, economical, abundant, non-hazardous and easy to synthesize. The invariably porous nanofiller, the Nanobentonite(clay), was synthesized using ion exchange reaction by creating acidic environment for accelerated dispersion with exfoliation by CTAB to enhance cation exchange capacity...
November 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29179089/on-the-rheology-of-mixed-systems-of-hydrophobically-modified-polyacrylate-microgels-and-surfactants-role-of-the-surfactant-architecture
#7
Luís Alves, Björn Lindman, Björn Klotz, Axel Böttcher, Hans-Martin Haake, Filipe E Antunes
HYPOTHESIS: The rheological control of suspensions is of key interest in the formulation design. A chemically cross-linked hydrophobically modified poly(acrylic acid) (HMCL-PAA), used as rheology modifier, is pH sensitive and shows swelling behavior above a critical pH due to the ionization of the acrylic acid groups. At low pH, HMCL-PAA suspensions are liquid and turbid. The binding of surfactants to HMCL-PAA, at low pH conditions, can result in significant changes on rheology and transparency of the polymeric suspensions, due to the swelling of the microgel particles...
November 20, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29174649/from-fly-ash-waste-slurry-to-functional-adsorbent-for-valuable-rare-earth-ion-separation-an-ingenious-combination-process-involving-modification-dewatering-and-grafting
#8
Qi Zhou, Tiantian Luo, Heng Yang, Cheng Liang, Luru Jing, Wenjun Luo
Acid extracting aluminum from fly ash would produce pestilent secondary fly ash slurry with strong acidity, high content of Cl- and residual Al3+ that is difficult to be further used. In order to achieve the zero emission, a potential integrated treatment process for reutilization was proposed in this paper. By intelligent use of residual Al3+ in sludge as catalyst, hydrophobic modification of solid particle was taken with fatty acid via a heterogeneous esterification at normal temperature. Due to the solvophobic force, moisture content of its filter cake was 36...
November 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29162884/copolymers-enhance-selective-bacterial-community-colonization-for-potential-root-zone-applications
#9
Vy T H Pham, Pandiyan Murugaraj, Falko Mathes, Boon K Tan, Vi Khanh Truong, Daniel V Murphy, David E Mainwaring
Managing the impact of anthropogenic and climate induced stress on plant growth remains a challenge. Here we show that polymeric hydrogels, which maintain their hydrous state, can be designed to exploit functional interactions with soil microorganisms. This microbial enhancement may mitigate biotic and abiotic stresses limiting productivity. The presence of mannan chains within synthetic polyacrylic acid (PAA) enhanced the dynamics and selectivity of bacterial ingress in model microbial systems and soil microcosms...
November 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29161509/variation-in-the-supersaturation-and-phase-behavior-of-ezetimibe-amorphous-solid-dispersions-upon-dissolution-in-different-biorelevant-media
#10
Ahmed Elkhabaz, Sreya Sarkar, Janny K Dinh, Garth J Simpson, Lynne S Taylor
The delivery of poorly water-soluble drugs using amorphous solid dispersions (ASDs) has been widely acknowledged as a promising strategy for enhancing oral bioavailability. Upon dissolution, ASDs have accelerated dissolution rates and yield supersaturated solutions leading to higher apparent solubilities. Understanding the complex phase behavior of ASDs during dissolution is crucial for developing an effective formulation. Since the absorption of a lipophilic, high permeability drug is determined primarily by the intraluminal dissolution process and the final concentration achieved, there is a need for evaluation in biorelevant dissolution media that simulate both fasting and fed gastrointestinal states...
November 21, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29156307/gum-xanthan-psyllium-cl-poly-acrylic-acid-co-itaconic-acid-based-adsorbent-for-effective-removal-of-cationic-and-anionic-dyes-adsorption-isotherms-kinetics-and-thermodynamic-studies
#11
Sukriti Chaudhary, Jitender Sharma, Balbir S Kaith, Satender Yadav, Ashish Kumar Sharma, Aayushi Goel
The present work highlights the synthesis of the adsorbent based on Gum xanthan-psyllium hybrid backbone graft co-polymerized with polyacrylic acid-co-polyitaconic acid chains for the rapid sequestration of auramine-O (Aur-O) and eriochrome black-T (EBT) dyes from the aqueous fluid. The excellent dye removal efficiency of 90.53% for EBT and 95.63% for Aur-O was found at initial dye concentration of 30mgL(-1) (EBT) and 15 mgL(-1) (Aur-O) 40mL(-1) with an adsorbent dose of 600mg within time duration of 5h and 323K temp...
November 17, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29155787/synthesis-of-core-shell-lanthanide-doped-upconversion-nanocrystals-for-cellular-applications
#12
Xiangzhao Ai, Linna Lyu, Jing Mu, Ming Hu, Zhimin Wang, Bengang Xing
Lanthanide-doped upconversion nanocrystals (UCNs) have attracted much attention in recent years based on their promising and controllable optical properties, which allow for the absorption of near-infrared (NIR) light and can subsequently convert it into multiplexed emissions that span over a broad range of regions from the UV to the visible to the NIR. This article presents detailed experimental procedures for high-temperature co-precipitation synthesis of core-shell UCNs that incorporate different lanthanide ions into nanocrystals for efficiently converting deep-tissue penetrable NIR excitation (808 nm) into a strong blue emission at 480 nm...
November 10, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29148694/ambient-aqueous-synthesis-of-ultrasmall-ni0-85se-nanoparticles-for-non-invasive-photoacoustic-imaging-and-combined-photothermal-chemo-therapy-of-cancer
#13
Xianwen Wang, Fei Li, Xu Yan, Yan Ma, Zhaohua Miao, Liang Dong, Huajian Chen, Yang Lu, Zhengbao Zha
Big size induced long-term retention in the body has hampered the translational applications of many reported nanomedicine. Herein, we reported a multifunctional theranostic agent composed of ultrasmall polyacrylic acid functionalized Ni0.85Se nanoparticles (PAA-Ni0.85Se NPs), which were successfully obtained through a facile ambient aqueous precipitation strategy. Without exhibiting any noticeable toxicity, the as-prepared PAA-Ni0.85Se NPs (average diameter of 6.40 ± 1.89 nm) showed a considerable absorption in near-infrared (NIR) region and high photothermal conversion efficiency (PTCE) of 54...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29142881/smear-layer-removal-by-different-chemical-solutions-used-with-or-without-ultrasonic-activation-after-post-preparation
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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