External conditions and interactions in room-temperature phosphorescence of hydroxyl aromatics adsorbed on solid surfaces containing poly(acrylic acid)

1983 ◽  
Vol 55 (7) ◽  
pp. 1084-1089 ◽  
Author(s):  
R. A. Dalterio ◽  
R. J. Hurtubise
Keyword(s):  
Acrylic Acid ◽  
Room Temperature ◽  
Solid Surfaces ◽  
Room Temperature Phosphorescence ◽  
External Conditions ◽  
Poly Acrylic Acid

Crystallization of vaterite and aragonite on chitin whiskers

2021 ◽  
Vol 16 (2) ◽  
pp. 23-30
Author(s):  
Michael Ikpi Ofem
Keyword(s):  
Calcium Carbonate ◽  
Acrylic Acid ◽  
Room Temperature ◽  
Spherical Shape ◽  
Time Frame ◽  
Sem Images ◽  
Volume Fractions ◽  
Chitin Whiskers ◽  
Calcium Carbonate Polymorphs ◽  
Poly Acrylic Acid

The need for the possibility of producing calcium carbonate crystals by the evaporation method within five minutes and the growth of different calcium carbonate polymorphs on chitin whiskers within the same time frame at room temperature necessitated these report. Chitin whiskers (CHWs) were used as insoluble substrates, while poly (acrylic) acid (PAA) is used as soluble additive. The crystals were grown in chitin whiskers, Poly (acrylic) acid and CHW/PAA composites. The volume fractions for aragonite, vaterite, and calcite are 0.10, 0.25, and 0.65, respectively, in the absence of chitin whiskers or Poly (acrylic) acid. Calcite and aragonite volume fractions decrease in favour of vaterite when PAA and or CHWs were added. SEM images in the absence of CHWs and PAA shows rhombohedral calcites that display steady and step like plane appearances with an average edge of between 1.3 and 1.4 μm. In the presence of only CHWs, the SEM images show a mixture of ellipsoidal and spherical shape vaterites. The spherical vaterites have smooth, rough, and some irregular surfaces. Rod-like aragonite polymorphs were seen when only PAA was used as the template. In the presence of both PAA and CHWs, the rhombohedral shape showed roughness with irregular faces. Keywords: Chitin whisker, Calcium carbonate, Calcium, vaterite aragonite, Polymorph, Mole fraction

Long-lived emission at room temperature of harmane dispersed in poly (acrylic acid)-poly (vinyl alcohol) polymer network

1999 ◽  
Vol 81 (3) ◽  
pp. 225-229 ◽  
Author(s):  
Jucimar M de Souza ◽  
Paulo N M. dos Anjos ◽  
Walter M de Azevedo ◽  
Alberto S Marques
Keyword(s):  
Acrylic Acid ◽  
Vinyl Alcohol ◽  
Room Temperature ◽  
Polymer Network ◽  
Poly Vinyl Alcohol ◽  
Poly Acrylic Acid

Room-Temperature Imprinting Poly(acrylic acid)/Poly(allylamine hydrochloride) Multilayer Films by Using Polymer Molds

Langmuir ◽  
2007 ◽  
Vol 23 (6) ◽  
pp. 3254-3259 ◽  
Author(s):  
Yingxi Lu ◽  
Xiaoling Chen ◽  
Wei Hu ◽  
Nan Lu ◽  
Junqi Sun ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Room Temperature ◽  
Multilayer Films ◽  
Allylamine Hydrochloride ◽  
Poly Acrylic Acid

Photoresponsive nanostructures of azobenzene-containing block copolymers at solid surfaces

2021 ◽  
Author(s):  
Shaodong Sun ◽  
Chenrui Yuan ◽  
Zhulu Xie ◽  
Wen-Cong Xu ◽  
Qijin Zhang ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Block Copolymers ◽  
Acrylic Acid ◽  
Self Assembly ◽  
The Self ◽  
Solid Surfaces ◽  
Copolymer Poly ◽  
Poly Acrylic Acid

The self-assembly properties and photoresponsive behaviours of an azobenzene-containing block copolymer poly(acrylic acid-block-6-(4-(p-tolyldiazenyl)phenoxy)hexyl acrylate) (PAA-b-PAzo) are reported. As azobenzene has reversible trans–cis photoisomerization abilities, the trans PAA-b-PAzo solutions were converted...

scholarly journals Hydrogen-Bonding-Driven Self-Assembly of PEGylated Organosilica Nanoparticles with Poly(acrylic acid) in Aqueous Solutions and in Layer-by-Layer Deposition at Solid Surfaces

Langmuir ◽  
2011 ◽  
Vol 28 (1) ◽  
pp. 299-306 ◽  
Author(s):  
Galiya S. Irmukhametova ◽  
Brian J. Fraser ◽  
Joseph L. Keddie ◽  
Grigoriy A. Mun ◽  
Vitaliy V. Khutoryanskiy
Keyword(s):  
Hydrogen Bonding ◽  
Acrylic Acid ◽  
Aqueous Solutions ◽  
Self Assembly ◽  
Solid Surfaces ◽  
Layer By Layer ◽  
Layer Deposition ◽  
Poly Acrylic Acid

scholarly journals Temperature and pH-Dependent Response of Poly(Acrylic Acid) and Poly(Acrylic Acid-co-Methyl Acrylate) in Highly Concentrated Potassium Chloride Aqueous Solutions

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 486
Author(s):  
Aleksander Sinek ◽  
Maria Kupczak ◽  
Anna Mielańczyk ◽  
Marcin Lemanowicz ◽  
Shin-ichi Yusa ◽  
...  
Keyword(s):  
Phase Transition ◽  
Acrylic Acid ◽  
Methyl Acrylate ◽  
Room Temperature ◽  
Hydrodynamic Diameter ◽  
Solution Ph ◽  
Zeta Potentials ◽  
Linear Poly ◽  
Cloud Point Temperature ◽  
Poly Acrylic Acid

In this study, the phase transition phenomena of linear poly(acrylic acid) (PAA) and linear or star-shaped poly(acrylic acid-co-methyl acrylate) (P(AA-co-MA)) in highly concentrated KCl solutions were investigated. The effects of polymer molecular weight, topology, and composition on their phase transition behavior in solution were investigated. The cloud point temperature (TCP) of polymers drastically increased as the KCl concentration (CKCl) and solution pH increased. CKCl strongly influenced the temperature range at which the phase transition of PAA occurred: CKCl of 1.0–2.2 M allowed the phase transition to occur between 30 and 75 °C. Unfortunately, at CKCl above 2.6 M, the TCP of PAA was too high to theoretically trigger the crystallization of KCl. The addition of hydrophobic methyl acrylate moieties decreased the TCP into a temperature region where KCl crystallization could occur. Additionally, the hydrodynamic diameters (Dh) and zeta potentials of commercial PAA samples were examined at room temperature and at their TCP using dynamic light scattering. The salt concentration (from 1 to 3 M) did not impact the hydrodynamic diameter of the molecules. Dh values were 1500 and 15 nm at room temperature and at TCP, respectively.

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.

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