UV crosslinked poly(acrylic acid): a simple method to bio-functionalize electrolyte-gated OFET biosensors

2015 ◽  
Vol 3 (25) ◽  
pp. 5049-5057 ◽  
Author(s):  
M. Y. Mulla ◽  
P. Seshadri ◽  
L. Torsi ◽  
K. Manoli ◽  
A. Mallardi ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Organic Semiconductor ◽  
Simple Method ◽  
Acid Coating ◽  
Poly Acrylic Acid

A sensitive EGOFET biosensor fabricated by anchoring bioprobes through a UV crosslinked poly(acrylic acid) coating deposited on an organic semiconductor.

Spectroscopic and Electronic Properties of Layer-by-Layer Assembled Gamma-Irradiated Silver/Poly(Acrylic Acid) Nanocomposites

2015 ◽  
Vol 1098 ◽  
pp. 19-24 ◽  
Author(s):  
Ken Aldren S. Usman ◽  
Lawrence John Paulo L. Trinidad ◽  
Leon M. Payawan
Keyword(s):  
Thin Films ◽  
Acrylic Acid ◽  
Electronic Properties ◽  
Indium Tin Oxide ◽  
Layer By Layer ◽  
Simple Method ◽  
Silica Surfaces ◽  
Vis Spectroscopy ◽  
Gamma Irradiated ◽  
Poly Acrylic Acid

Layer-by-layer (L-b-L) assembly is a simple method that is useful in immobilizing nanomaterials into thin films. However, the retention of the optical and photogalvanic property of the nanoparticles and the functionalization of these materials are the common issues raised regarding this technique. In this study, L-b-L thin films were prepared from γ-radiation reduced,silver/poly (acrylic acid) nanocomposites (Ag/PAA). Negatively surface charged nanocomposites were immobilized on different silica surfaces, namely quartz, Indium Tin Oxide-modified glass and ordinary glass. Characterization of the solution and bound form of the nanocomposites were done to evaluate the retention of their novel properties. The size distribution of the solution-phased Ag/PAA was assessed using dynamic light scattering (DLS). The surface morphology, spectroscopic and electronic properties of the multilayer films were characterized using atomic force microscopy (AFM), scanning electron microscopy (SEM), UV-vis spectroscopy, surface plasmon resonance (SPR) and cyclic voltammetry (CV).

scholarly journals Facile TEMPO Immobilization onto Poly(acrylic acid)-Modified Magnetic Nanoparticles: Preparation and Property

2017 ◽  
Vol 2017 ◽  
pp. 1-8
Author(s):  
Guohui Huang ◽  
Xiaoxuan Liu ◽  
Yiling Bei ◽  
Huiqing Ma
Keyword(s):  
Magnetic Nanoparticles ◽  
Acrylic Acid ◽  
Polymer Chain ◽  
Magnetic Particles ◽  
Esterification Reaction ◽  
Catalyst Recycling ◽  
Simple Method ◽  
Nanocomposite Catalyst ◽  
Modified Magnetic Nanoparticles ◽  
Poly Acrylic Acid

Adding catalysts to magnetic polyvalent supports facilitating catalyst recycling and recovery seems feasible. Polymer-modified magnetic nanocomposites for organocatalyst immobilization are a plausible approach to this technology. Here, we present facile and efficient method for 2,2′,6,6′-tetramethylpiperidinyl-1-oxy (TEMPO) immobilization onto polymer-modified magnetic nanoparticles under mild reaction conditions. Poly(acrylic acid) was chosen to graft from magnetic nanoparticle through a simple inverse emulsion polymerization technique. The resulting poly(acrylic acid) magnetic nanocomposite is an ideal material to immobilize the organocatalyst 4-hydroxy-2,2′,6,6′-tetramethylpiperidinyl-1-oxy (H-TEMPO) via an esterification reaction with pendant carboxyl group on the polymer chain. Instrumental analysis confirmed that poly(acrylic acid) chain was grafted on the silica-coated magnetic particles by this simple method while maintaining their magnetic properties; elemental analysis indicated that TEMPO was efficiently immobilized onto the polymer chain. The catalysis tests under both Anelli and Minisci system showed that the nanocomposite catalyst exhibits proper selectivity and activity for the alcohol/aldehyde transformation. Recycling experiments showed that stability and reusability of the nanocomposite catalyst were satisfying.

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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