Uniform Poly(acrylic acid)-Functionalized Lanthanide-Doped LaVO4Nanophosphors with High Colloidal Stability and Biocompatibility

2015 ◽  
Vol 2015 (27) ◽  
pp. 4546-4554 ◽  
Author(s):  
Nuria O. Nuñez ◽  
Paola Zambrano ◽  
Jorge García-Sevillano ◽  
Eugenio Cantelar ◽  
Sara Rivera-Fernández ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Colloidal Stability ◽  
Poly Acrylic Acid

scholarly journals Radiation synthesis of poly(acrylic acid) nanogels for drug delivery applications – post-synthesis product colloidal stability

Nukleonika ◽  
2021 ◽  
Vol 66 (4) ◽  
pp. 179-186
Author(s):  
Beata P. Rurarz ◽  
Natalia Gibka ◽  
Małgorzata Bukowczyk ◽  
Sławomir Kadłubowski ◽  
Piotr Ulański
Keyword(s):  
Drug Delivery ◽  
Acrylic Acid ◽  
Colloidal Stability ◽  
Biologically Active ◽  
Cross Linking ◽  
Synthesis Product ◽  
High Dose ◽  
Water Radiolysis ◽  
Drug Delivery Applications ◽  
Poly Acrylic Acid

Abstract Synthesis of polymer nanogels (NGs) for biomedical applications is considered to be a very promising application in radiation engineering. Under high-dose pulse irradiation of dilute aqueous polymer solution, reactive species generated by water radiolysis can create multiple radicals on each macromolecule and consequently induce intramolecular cross-linking of polymer chains, resulting in NG formation. The obtained products are free from harmful monomers, initiators, and cross-linking agents, which makes them potentially applicable for drug delivery applications. One of the biggest challenges in handling and use of nanoparticles, however, is the colloidal stability, when aqueous suspensions are stored for prolonged periods. Therefore, development of the best protocols for the particular nanocarrier storage is key. To address this need, we have performed the prospective study in which we systematically assessed the influence of various processing and storage scenarios feasible in our lab, on the colloidal stability of the radiation-synthesized poly(acrylic acid) (PAA) NG particles in suspension. This allowed us to choose the optimal way of handling the product after its synthesis. We confirmed that none of the strategies we used and tested are substantially detrimental to our product. Filtration with 0.2-μm filters was proven sufficient for sample purification and prolonged storage in aqueous suspension did not exert a negative effect on the colloidal stability of particles suspension. We have also demonstrated that lyoprotectant-free lyophilization was suitable for our polymer nanoparticles. This is an important fact for further application of particles as nanocarriers for biologically active compounds such as targeting ligands or therapeutic moieties.

Effect of poly(acrylic acid) and poly(vinyl alcohol) on the solubility of colloidal BaTiO3 in an aqueous medium

2003 ◽  
Vol 18 (5) ◽  
pp. 1266-1274 ◽  
Author(s):  
Ungyu Paik ◽  
Vincent A. Hackley ◽  
Jaeho Lee ◽  
Sangkyu Lee
Keyword(s):  
Acrylic Acid ◽  
Vinyl Alcohol ◽  
Colloidal Stability ◽  
Dielectric Materials ◽  
Poly Vinyl Alcohol ◽  
Acidic Ph ◽  
Incongruent Dissolution ◽  
Solution Interface ◽  
Materials Used ◽  
Poly Acrylic Acid

The influence of poly(acrylic acid) (PAA) and poly(vinyl alcohol) (PVA) on Ba dissolution from the BaTiO3-aqueous solution interface was investigated. Incongruent dissolution of Ba impacts the colloidal stability, microstructure, and electrical properties of BaTiO3 and related perovskite dielectric materials used in the manufacture of ceramic capacitors. The solubility characteristics of BaTiO3 were influenced significantly by the presence of PAA and PVA. PAA, which forms weak monodentate complexes with Ba2+, acted as both a passivating and a sequestering agent, depending on pH. Both PAA and PVA provided some degree of passivation in the acidic pH region. Above pH 8, where BaTiO3 solubility decreases sharply, PVA had a moderate passivating effect, whereas solubility was enhanced by PAA with a positive linear dependence on concentration. The adsorptive and electrokinetic behavior of colloidal BaTiO3 with respect to PAA and PVA are correlated with the observed passivating and sequestering properties of these polymers.

scholarly journals Colloidal stability and catalytic activity of cerium oxide nanoparticles in cell culture media

RSC Advances ◽  
2020 ◽  
Vol 10 (65) ◽  
pp. 39373-39384 ◽  
Author(s):  
Xiaohui Ju ◽  
Anna Fučíková ◽  
Břetislav Šmíd ◽  
Jaroslava Nováková ◽  
Iva Matolínová ◽  
...  
Keyword(s):  
Cell Culture ◽  
Catalytic Activity ◽  
Acrylic Acid ◽  
Cerium Oxide ◽  
Colloidal Stability ◽  
Culture Media ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Cell Culture Media ◽  
Poly Acrylic Acid

Cerium oxide nanoparticles coated with poly(acrylic acid) exhibited high colloidal stability and preserved catalytic activity in cell culture media.

Soft ionic liquid based resistive memory characteristics in a two terminal discrete polydimethylsiloxane cylindrical microchannel

2020 ◽  
Vol 8 (38) ◽  
pp. 13368-13374
Author(s):  
Muhammad Umair Khan ◽  
Gul Hassan ◽  
Jinho Bae
Keyword(s):  
Ionic Liquid ◽  
Acrylic Acid ◽  
Sodium Hydroxide ◽  
Sodium Salt ◽  
Resistive Memory ◽  
Cylindrical Microchannel ◽  
Memory Characteristics ◽  
Poly Acrylic Acid

This paper proposes a novel soft ionic liquid (IL) electrically functional device that displays resistive memory characteristics using poly(acrylic acid) partial sodium salt (PAA-Na+:H2O) solution gel and sodium hydroxide (NaOH) in a thin polydimethylsiloxane (PDMS) cylindrical microchannel.

Reactions of macroions with ester and carboxylic groups of polymers

1987 ◽  
Vol 52 (9) ◽  
pp. 2194-2203
Author(s):  
Miloslav Kučera ◽  
Dušan Kimmer ◽  
Karla Majerová ◽  
Josef Majer
Keyword(s):  
Maleic Anhydride ◽  
Acrylic Acid ◽  
Methyl Methacrylate ◽  
Bond Formation ◽  
Covalent Bond ◽  
The Other ◽  
Poly Methyl Methacrylate ◽  
Other Hand ◽  
Carboxylic Groups ◽  
Poly Acrylic Acid

In the reaction of dianions with poly(methyl methacrylate), only an insignificant amount of insoluble crosslinked product is obtained. If, however, the concentration of grafting dianions approaches that of ester groups, the amount of poly(methyl methacrylate) which may thus be crosslinked becomes quite significant. Dications, too, can bring about crosslinking of only an insignificant number of poly(methyl methacrylate) chains. Carboxylic groups in poly(acrylic acid) react with dianions and dications in an anhydrous medium similarly to ester groups. On the other hand, in the presence of a cocatalytic amount of water dications are more readily bound to carboxylic groups, forming a covalent bond. The relatively highest efficiency was observed in the bond formation between dication and the poly[styrene-alt-(maleic anhydride)], both in an anhydrous medium and in the presence of H2O.

Fabrication and Characterization of Chitosan-Poly(acrylic acid) Magnetic Nanospheres

2009 ◽  
Vol 9 (2) ◽  
pp. 1287-1290 ◽  
Author(s):  
Yuqing Ge ◽  
Song Zhang ◽  
Shiying He ◽  
Yu Zhang ◽  
Ning Gu
Keyword(s):  
Acrylic Acid ◽  
Magnetic Nanospheres ◽  
Fabrication And Characterization ◽  
Poly Acrylic Acid

Synthesis, characterization, and their some chemical and biological properties of PVA/PAA/nPS hydrogel nanocomposites: Hydrogel and wound dressing

2020 ◽  
Vol 35 (3) ◽  
pp. 203-215
Author(s):  
Mehmet Emin Diken ◽  
Berna Koçer Kizilduman ◽  
Begümhan Yilmaz Kardaş ◽  
Enes Emre Doğan ◽  
Mehmet Doğan ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Acrylic Acid ◽  
Infrared Spectra ◽  
Vinyl Alcohol ◽  
Fourier Transform Infrared ◽  
Poly Vinyl Alcohol ◽  
Seed Particles ◽  
Fourier Transform Infrared Spectra ◽  
Hydrogel Nanocomposites ◽  
Poly Acrylic Acid

The nanocomposite hydrogels were prepared by dispersing of the nanopomegranate seed particles into poly(vinyl alcohol)/poly(acrylic acid) blend matrix in an aqueous medium by the solvent casting method. These hydrogels were characterized using scanning electron microscopy, Fourier transform infrared spectra, differential scanning calorimetry, and optical contact angle instruments. The nanopomegranate seed, blend, and hydrogel nanocomposites were tested for microbial activity. In addition, cytocompatibilities of these blend and hydrogel nanocomposites/composites were tested on human lymphocyte with in vitro MTS cell viability assays. Fourier transform infrared spectra revealed that esterification reaction took place among functional groups in the structure of poly(vinyl alcohol) and poly(acrylic acid). The hydrophilic properties of all hydrogels decreased with increasing nanopomegranate seed content. The mean diameters of the nanopomegranate seed particles were about 88 nm. Nanopomegranate seed particles demonstrated antibacterial properties against gram-positive bacteria, Staphylococcus aureus, and gram-negative bacteria, Escherichia coli. The lymphocyte viabilities increased after addition of nanopomegranate seeds into the polymer blend. The swelling behavior of blend and hydrogels was dependent on the cross-linking density created by the reaction between poly(vinyl alcohol)/poly(acrylic acid) blend and nanopomegranate seed. Scanning electron microscopy images were highly consistent with Fourier transform infrared spectra, differential scanning calorimetry, and antibacterial activity results.

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