Phase Behavior ofN-(Isopropyl)propionamide in Aqueous Solution and Changes in Hydration Observed by FTIR Spectroscopy

2008 ◽  
Vol 112 (15) ◽  
pp. 4474-4477 ◽  
Author(s):  
Barbara Geukens ◽  
Filip Meersman ◽  
Erik Nies
Keyword(s):  
Aqueous Solution ◽  
Phase Behavior ◽  
Ftir Spectroscopy

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.

Effects of Alcohols and Counterions on the Phase Behavior of 1-Octyl-3-methylimidazolium Chloride Aqueous Solution

2007 ◽  
Vol 111 (40) ◽  
pp. 11708-11713 ◽  
Author(s):  
Guodong Zhang ◽  
Xiao Chen ◽  
Yurong Zhao ◽  
Yizhou Xie ◽  
Huayu Qiu
Keyword(s):  
Aqueous Solution ◽  
Phase Behavior

scholarly journals Anisotropic Interactions in Protein Mixtures: Self Assembly and Phase Behavior in Aqueous Solution

2012 ◽  
Vol 3 (6) ◽  
pp. 731-734 ◽  
Author(s):  
Anıl Kurut ◽  
Björn A. Persson ◽  
Torbjörn Åkesson ◽  
Jan Forsman ◽  
Mikael Lund
Keyword(s):  
Aqueous Solution ◽  
Phase Behavior ◽  
Self Assembly ◽  
Anisotropic Interactions

Phase Behavior of Copolymer-Homopolymer Mixtures in Aqueous Solution

1994 ◽  
Vol 98 (9) ◽  
pp. 2452-2458 ◽  
Author(s):  
Kewei Zhang ◽  
Mats Carlsson ◽  
Per Linse ◽  
Bjoern Lindman
Keyword(s):  
Aqueous Solution ◽  
Phase Behavior

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.

Sign in / Sign up

Export Citation Format

Share Document