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Polyacrylate acid

Alexander I Wiechert, Wei-Po Liao, Eunice Hong, Candice E Halbert, Sotira Yiacoumi, Tomonori Saito, Costas Tsouris
This study focuses on the influence of hydrophilic groups and metal-ion loading on adsorbent polymer conformation, which controls access to adsorption sites and may limit adsorption capacity. Gaining a better understanding of the factors that influence conformation may yield higher-capacity adsorbents. Polyamidoxime (PAO), deuterated-PAO polyacrylic acid diblock copolymers (d-PAO-b-PAA), and randomly configured copolymers (PAO-co-PAA) were synthesized and characterized by neutron reflectometry in air and D2 O...
April 6, 2018: Journal of Colloid and Interface Science
Yong Fu, Yue Huang, Jianshe Hu
A novel functional hybrid mesoporous composite material (CMP) based on chitosan and MCM-41-PAA was reported and its application as an excellent adsorbent for Hg(II) ions was also investigated. Innovatively, MCM-41-PAA was prepared by using diatomite and polyacrylic acid (PAA) with integrated polymer-silica hybrid frameworks, and then CMP was fabricated by introducing MCM-41-PAA to chitosan using glutaraldehyde as a cross-linking agent. The structure and morphology of CMP were characterized by X-ray diffraction, Fourier transform infrared spectra, thermogravimetric analysis, scanning electron microscopy and Brunauer-Emmett-Teller measurements...
March 2018: Royal Society Open Science
Lei Xu, Yiran Shao, Chengkang Chang, Yingchun Zhu
Tumor hypoxia is known to result in radiotherapy resistance and traditional radiotherapy using super-hard X-ray irradiation can cause considerable damage to normal tissue. Therefore, formamide peroxide (FPO) with high reactive oxygen content was employed to enhance the oxygen concentration in tumor cells and increase the radio-sensitivity of low-energy soft-X-ray. To improve stability of FPO, FPO is encapsulated into polyacrylic acid (PAA)-coated hollow mesoporous silica nanoparticles (FPO@HMSNs-PAA). On account of the pH-responsiveness of PAA, FPO@HMSNs-PAA will release more FPO in simulated acidic tumor microenvironment (pH 6...
April 12, 2018: Materials
Esteban Piccinini, Jimena S Tuninetti, Joseba Irigoyen Otamendi, Sergio E Moya, Marcelo Ceolín, Fernando Battaglini, Omar Azzaroni
Interfacial supramolecular architectures displaying mesoscale organized components are of fundamental importance for developing materials with novel or optimized properties. Nevertheless, engineering the multilayer assembly of different building blocks onto a surface and exerting control over the internal mesostructure of the resulting film is still a challenging task in materials science. In the present work we demonstrate that the integration of surfactants (as mesogenic agents) into layer-by-layer (LbL) assembled polyelectrolyte multilayers offers a straightforward approach to control the internal film organization at the mesoscale level...
April 4, 2018: Physical Chemistry Chemical Physics: PCCP
Salvatore Sauro, Timothy Watson, Agustin Pascual Moscardó, Arlinda Luzi, Victor Pinheiro Feitosa, Avijit Banerjee
OBJECTIVE: To evaluate the effect of load-cycle aging and/or 6 months artificial saliva (AS) storage on bond durability and interfacial ultramorphology of resin-modified glass ionomer cement (RMGIC) applied to dentine air-abraded using Bioglass 45S5 (BAG) with/without polyacrylic acid (PAA) conditioning. METHODS: RMGIC (Ionolux, VOCO) was applied onto human dentine specimens prepared with silicon-carbide abrasive paper or air-abraded with BAG with or without the use of PAA conditioning...
March 30, 2018: Journal of Dentistry
Tian Liang, Chunjie Yan, Xujian Li, Sen Zhou, Hongquan Wang
In the development of industrial life, an enormous amount of silica fume (SF) has been accumulated and cannot be reused properly, and a large quantity of rare-earth elements in industrial wastewater has been inappropriately discharged, both of which pose a threat to human health and the environment. By using UV photocatalytic grafting technology, a polymer brush grafted from modified SF, which can be used as a high efficiency adsorbent, can solve both problems at the same time. Specifically, SF was firstly silanol-functionalized by γ-methacryloxypropyltrimethoxysilane (KH570), then grafted with polyacrylic acid brushes by UV photocatalytic grafting to finally obtain the adsorbent...
March 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Xue-Ping Cai, Bin Zhang, Xiao-Bo Chen, Hai-Yang Ding, Bing-Ren Gu, Hong-Ping Xie
Cationic poly-diallyldimethylammonium (PDADMAC), green CdTe quantum dots (QDs) or red CdS coated CdTe QDs, and anionic polyacrylic acid (PAA) were respectively assembled on the nano-carrier SiO2 to prepare green fluorescence composite nanoparticles (GF-QDs) and red ones (RF-QDs) with the structure SiO2 /PDADMAC/QD/PDADMAC/PAA. The sandwich structure "PDADMAC/QD/PDADMAC" on the nano-carrier not only realized the protection to fluorescence of QDs but also avoided the fluorescence shielding of silica shell for the assembled QDs...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Ang Li, Yunfei Jia, Shengtong Sun, Yisheng Xu, Burcu Minsky, Martien Abraham Cohen Stuart, Helmut Cölfen, Regine von Klitzing, Xuhong Guo
Underwater adhesion is crucial to many marine life forms living a sedentary life style. Amongst them, mussel adhesion has been mostly studied, which inspires numerous investigations of 3,4-dihydroxyphenylalanine (DOPA)-based organic adhesives. In contrast, reef-buliding oysters represent another important "inorganic" strategy of marine molluscs for adhesion by generating biomineralized organic-inorganic adhesives, which is still rarely studied and no synthetic analogues have ever been reported so far...
March 8, 2018: ACS Applied Materials & Interfaces
Nemany Abdelhamid Nemany Hanafy, Alessandra Quarta, Marzia Maria Ferraro, Luciana Dini, Concetta Nobile, Maria Luisa De Giorgi, Sonia Carallo, Cinzia Citti, Antonio Gaballo, Giuseppe Cannazza, Rosaria Rinaldi, Gianluigi Giannelli, Stefano Leporatti
LY2157299 (LY), which is very small molecule bringing high cancer diffusion, is a pathway antagonist against TGFβ. LY dosage can be diluted by blood plasma, can be captured by immune system or it might be dissolved during digestion in gastrointestinal tract. The aim of our study is to optimize a "nano-elastic" carrier to avoid acidic pH of gastrointestinal tract, colon alkaline pH, and anti-immune recognition. Polygalacturonic acid (PgA) is not degradable in the gastrointestinal tract due to its insolubility at acidic pH...
March 6, 2018: International Journal of Molecular Sciences
Qiang Chen, Jiajia Jing, Hongfei Qi, Ifty Ahmed, Haiou Yang, Xianhu Liu, T L Lu, Aldo R Boccaccini
Structural and compositional modification of metallic implant surfaces is being actively investigated in order to achieve improved bone-to-implant bonding. In this study, a strategy to modify bulk metallic surfaces by electrophoretic deposition (EPD) of short phosphate glass fibers (sPGF) is presented. Random and aligned orientation of sPGF embedded in a polyacrylic acid (PAA) matrix is achieved by vertical and horizontal EPD, respectively. The influence of EPD parameters on the degree of alignment is investigated to pave the way for the fabrication of highly aligned sPGF structures in large areas...
March 5, 2018: ACS Applied Materials & Interfaces
Marcella Cabrera Berg, Ana Raquel Benetti, Mark T F Telling, Tilo Seydel, Dehong Yu, Luke L Daemen, Heloisa N Bordallo
: Hydrogen dynamics in a time range from hundreds of femtoseconds (fs) to nanoseconds (ns) can be directly analyzed using neutron spectroscopy, where information on the inelastic and quasi-elastic scattering, hereafter INS and QENS, can be obtained. In this study, we applied these techniques to understand how the nanoscale mobility of the aqueous solution of polyacrylic acid (PAA) used in conventional Glass Ionomer Cements (GIC) changes under confinement. Combining the spectroscopic analysis with calorimetric results we were able to separate distinct motions within the liquid and in the GIC's...
March 5, 2018: ACS Applied Materials & Interfaces
Jing Zhang, Richard J M Lynch, Timothy F Watson, Avijit Banerjee
OBJECTIVE: To investigate the remineralisation of chitosan pre-treated enamel white spot lesions (WSLs) by bioglass in the presence of the pellicle layer. METHODS: 50 artificial enamel white spot lesions were created by acidic gel. Two lesions were used to investigate the formation of the pellicle layer by treating with human whole saliva for 3 minutes. 48 lesions were assigned to 6 experimental groups (n = 8): (1) bioactive glass slurry, (2) bioactive glass containing polyacrylic acid (BG + PAA) slurry, (3) chitosan pre-treated WSLs with BG slurry (CS-BG), (4) chitosan pre-treated WSLs with BG + PAA slurry (CS-BG + PAA), (5) "standard" remineralisation solution (RS) and (6) de-ionised water (negative control, NC)...
February 20, 2018: Journal of Dentistry
Jingke Liu, Wei Zhao, Shaohui Li, Aixia Zhang, Yuzong Zhang, Songyan Liu
The volatile compounds in proso millet wine were extracted by headspace solid-phase microextraction (85 μm polyacrylate (PA), 100 μm polydimethylsiloxane (PDMS), 75 μm Carboxen (CAR)/PDMS, and 50/30 μm divinylbenzene (DVB)/CAR/PDMS fibers), and analyzed using gas chromatography-mass spectrometry; the odor characteristics and intensities were analyzed by the odor activity value (OAV). Different sample preparation factors were used to optimize this method: sample amount, extraction time, extraction temperature, and content of NaCl...
February 20, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Luck Tosan Ereku, Ruth E Mackay, Pascal Craw, Angel Naveenathayalan, Thomas Stead, Manorharanehru Branavan, Wamadeva Balachandran
A point of care device utilising Lab-on-a-Chip technologies that is applicable for biological pathogens was designed, fabricated and tested showing sample in to answer out capabilities. The purpose of the design was to develop a cartridge with the capability to perform nucleic acid extraction and purification from a sample using a chitosan membrane at an acidic pH. Waste was stored within the cartridge with the use of sodium polyacrylate to solidify or gelate the sample in a single chamber. Nucleic acid elution was conducted using the RPA amplification reagents (alkaline pH)...
February 12, 2018: Analytical Biochemistry
Roland Masa, Ágota Deák, Gábor Braunitzer, Zsolt Tóth, Judit Kopniczky, István Pelsőczi-Kovács, Krisztina Ungvári, Imre Dékány, Kinga Turzó
Failure of dental implants is caused mainly by peri-implant infections resulting in loss of supporting bone. Since there is no ideal therapy of peri-implantitis, the focus of research has been shifted toward better prevention and the development of antibacterial surfaces. In our study we examined the attachment and proliferation of primary epithelial and MG-63 osteosarcoma cells on Ti dental implants coated with photocatalytic nanohybrid films. Two polyacrylate resin based layers were investigated on commercially pure (CP4) Ti discs: 60 wt% TiO2/40 wt% copolymer and 60 wt% Ag-TiO2/40 wt% copolymer ([Ag] = 0,001 wt%)...
June 1, 2018: Journal of Nanoscience and Nanotechnology
Zhonghua Huang, Mengkun Li, Na Li, Xinyuan Tang, Zhiyu Ouyang
Membrane technology is now being widely used in the field of water treatment for its unique advantages. Layer-by-layer (LbL) self-assembly technique is a convenient and versatile method of modified nanofiltration (NF) membranes fabrication, which can be used to control the thickness and the surface properties of membranes by chemical deposition of polyelectrolytes. Herein, a new kind of composite NF membrane with enhanced antibacterial properties was successfully fabricated through LbL self-assembly method, having polyether sulfone (PES) ultrafiltration (UF) membrane as support layer, N-[(2-hydroxy-3-trimethylammonium)propyl] chloride chitosan (HTCC) and polyacrylic acid (PAA) as active layer, and epichlorohydrin (ECH) as crosslinking reagent...
July 1, 2018: Journal of Nanoscience and Nanotechnology
Dorota Wójcik-Pastuszka, Iwona Golonka, Andrzej Drys, Jobst B Mielck, Maria Twarda, Witold Musiał
BACKGROUND: Gastric residence time is the key factor affecting the bioavailability of active pharmaceutical ingredients absorbed mainly through the gastric mucous membrane and influencing the local activity of some drugs. OBJECTIVES: The aim of this study was the development of a new composition of non-effervescent floating tablets and the evaluation of the effect of an anionic polymer and compressive force on the floating properties and release characteristics of tablets containing a model alkaline drug, chlorhexidine (CHX)...
December 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
Kenta Morita, Takahiro Suzuki, Yuya Nishimura, Kazuhisa Matsumoto, Chiya Numako, Kazuyoshi Sato, Masao Nakayama, Ryohei Sasaki, Chiaki Ogino, Akihiko Kondo
Polyacrylic acid (PAA)-modified titanium peroxide nanoparticles (PAA-TiOx NPs) are promising radiosensitizers. PAA-TiOx NPs were synthesized from commercial TiO2 nanoparticles that were modified with PAA and functionalized by H2O2 treatment. To realize practical clinical uses for PAA-TiOx NPs, their tissue distribution and acute toxicity were evaluated using healthy mice and mice bearing tumors derived from xenografted MIAPaCa-2 human pancreatic cancer cells. Healthy mice were injected with PAA-TiOx NPs at 25 mg/kg body weight via the tail vein, and tumor-bearing mice were injected either into the tumor locally or via the tail vein...
February 7, 2018: Journal of Bioscience and Bioengineering
Quanguo He, Jun Liu, Jing Liang, Xiaopeng Liu, Du Tuo, Wen Li
Solubility parameter-dependent drug releasing property is essential in practical drug delivery systems (DDS), and how to combine magnetic nanoparticles(NPs) and suitable polymer coating towards DDS is always a crucial and valuable challenge in biomedical application. Herein, a controllable drug delivery model with a surface having a chemically tunable solubility parameter is presented using hollow magnetite/polyacrylic acid (Fe₃O₄/PAA) nanocomposites as nanocarrier towards DDS. This composite is prepared by simply coating the modified hollow Fe₃O₄ with PAA...
February 6, 2018: Materials
Seema Saroj, Sadhana J Rajput
A multifaceted therapeutic platform has been proposed for controlled delivery of Etoposide (ETS) leading to a synergistic advantage of maximum therapeutic efficacy and diminished toxicity. A state of the art pH responsive nanoparticles (NPs) MSNs-PAA consisting of mesoporous silica nanoparticles core and polymeric shell layers, were developed for controlled release of model anti-cancer drug ETS. Graft onto strategy was employed and amination served as an interim step, laying a vital foundation for functionalization of the MSN core with hydrophilic and pH responsive polyacrylic acid (PAA)...
February 7, 2018: Drug Development and Industrial Pharmacy
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