Pressure Effect on the Hydration Properties of Poly(N-isopropylacrylamide) in Aqueous Solution Studied by FTIR Spectroscopy

2005 ◽  
Vol 38 (21) ◽  
pp. 8923-8928 ◽  
Author(s):  
Filip Meersman ◽  
Jing Wang ◽  
Yuqing Wu ◽  
Karel Heremans
Keyword(s):  
Aqueous Solution ◽  
Ftir Spectroscopy ◽  
Pressure Effect ◽  
Hydration Properties

scholarly journals Demicellization of Polyethylene Oxide in Water Solution under Static Magnetic Field Exposure Studied by FTIR Spectroscopy

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Emanuele Calabrò ◽  
Salvatore Magazù
Keyword(s):  
Magnetic Field ◽  
Aqueous Solution ◽  
Ftir Spectroscopy ◽  
Static Magnetic Field ◽  
Polyethylene Oxide ◽  
Water Solution ◽  
Infrared Region ◽  
Bending Vibrations ◽  
Field Exposure ◽  
Methylene Groups

FTIR spectroscopy was used to investigate the alterations of the vibration bands in the mid-infrared region of Polyethylene oxide in aqueous solution at 25 mg/mL concentration under exposure up to 4 h to a static magnetic field at 200 mT. FTIR spectroscopic analysis of PEO solution in the range 3500–1000 cm−1 evidenced the stretching vibrations of ether band, C–H symmetric-antisymmetric and bending vibrations of methylene groups, and the C–O–C stretching band. A significant decrease in intensity of symmetric and asymmetric stretching CH2 vibration bands occurred after 2 h and 4 h of exposure, followed by a significant decrease in intensity of scissoring bending in plane CH2 vibration around 1465 cm−1. Finally, the C–O–C stretching band around 1080 cm−1 increased in intensity after 4 h of exposure. This result can be attributed to the increase of formation of the intermolecular hydrogen bonding that occurred in PEO aqueous solution after SMF exposure, due to the reorientation of PEO chain after exposure to SMF. In this scenario, the observed decrease in intensity of CH2 vibration bands can be understood as well considering that the reorientation of PEO chain under the applied SMF induces PEO demicellization.

Influence of pressure on the state of poly(N-isopropylacrylamide) and poly(N,N-diethylacrylamide) derived polymers in aqueous solution as probed by FTIR-spectroscopy

Polymer ◽  
2010 ◽  
Vol 51 (16) ◽  
pp. 3653-3659 ◽  
Author(s):  
Matthias Pühse ◽  
Martina Keerl ◽  
Christine Scherzinger ◽  
Walter Richtering ◽  
Roland Winter
Keyword(s):  
Aqueous Solution ◽  
Ftir Spectroscopy ◽  
The State

GENERATING A STREAM WITH A STABLE FORMALDEHYDE CONCENTRATION IN THE LABORATORY

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Mitham Al-faliti ◽  
Ashraf Aly Hassan ◽  
Bruce Dvorak
Keyword(s):  
Aqueous Solution ◽  
Fourier Transform ◽  
Ftir Spectroscopy ◽  
Gaseous Phase ◽  
Phosphate Buffer ◽  
Formaldehyde Concentration ◽  
Formaldehyde Solution ◽  
Trickling Filter ◽  
Aqueous Formaldehyde Solution ◽  
Aqueous Formaldehyde

A laboratory-scale bio-trickling filter (BTF) was initialized to evaluate the removal of formaldehyde biologically. However, generating formaldehyde gas in the lab is one of the grand challenges hindering research efforts. Formaldehyde was introduced into the gaseous phase by aerating the required air flowrate through a diluted formaldehyde solution mixed with methanol as a stabilizer by a bubbler. However, achieving stable gaseous influent concentrations of formaldehyde was challenging since it polymerizes while volatilizing. Resulting in paraformaldehyde. The resulting white powder clogged the pipes and generated uneven gaseous concentrations. To solve this problem, sodium hydroxide (NaOH) was added with a phosphate buffer to the aqueous formaldehyde solution to maintain the pH between 7.00-7.20. Additionally, the aqueous solution needed to be heated at 60℃ to eliminate the polymerization. The exhausted formaldehyde by volatilization was replaced by a continuous supply of aqueous diluted formaldehyde solution to keep the volume and mass of the aqueous solution and formaldehyde constant, respectively. Stable gaseous concentration was achieved for extended periods of time and verified by Fourier transform infrared (FTIR) spectroscopy.

Hydration properties determining the reactivity of nitrite in aqueous solution

2014 ◽  
Vol 43 (32) ◽  
pp. 12164-12174 ◽  
Author(s):  
Saowapak Vchirawongkwin ◽  
Chinapong Kritayakornupong ◽  
Anan Tongraar ◽  
Viwat Vchirawongkwin
Keyword(s):  
Aqueous Solution ◽  
Quantitative Analysis ◽  
Steric Effects ◽  
Nitrite Ion ◽  
Hydration Properties ◽  
Hydration Structure ◽  
Rigorous Method

Quantitative analysis of the QMCF MD trajectories requires a rigorous method to organize the chaotic data into informative data, clarifying the anisotropy of the hydration structure around the nitrite ion. These results suggested the steric effects of water in the bond directions.

Pressure Effect on the Chain Shrinkage of Poly(vinylpyrrolidone) Induced by Complexation with a Hydrophobic Compound in Aqueous Solution

1998 ◽  
Vol 31 (25) ◽  
pp. 8840-8844 ◽  
Author(s):  
Naoki Tanaka ◽  
Motoyoshi Takemura ◽  
Takashi Konno ◽  
Shigeru Kunugi
Keyword(s):  
Aqueous Solution ◽  
Pressure Effect ◽  
Hydrophobic Compound
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