Effects of Nucleotides on the Denaturation of F Actin: A Differential Scanning Calorimetry and FTIR Spectroscopy Study

1997 ◽  
Vol 236 (3) ◽  
pp. 798-803 ◽  
Author(s):  
Hélène Bombardier ◽  
Patrick Wong ◽  
Claude Gicquaud
Keyword(s):  
Differential Scanning Calorimetry ◽  
Ftir Spectroscopy ◽  
Spectroscopy Study ◽  
Scanning Calorimetry

scholarly journals An Infrared Spectroscopy Study of the Conformational Evolution of the Bis(trifluoromethanesulfonyl)imide Ion in the Liquid and in the Glass State

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Oriele Palumbo ◽  
Francesco Trequattrini ◽  
Francesco Maria Vitucci ◽  
Maria Assunta Navarra ◽  
Stefania Panero ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Ionic Liquid ◽  
Glassy State ◽  
Far Infrared ◽  
Energy Separation ◽  
Vibration Frequencies ◽  
Spectroscopy Study ◽  
Boltzmann Factor ◽  
Scanning Calorimetry ◽  
B3lyp Level

We measure the far-infrared spectrum of N,N-Dimethyl-N-ethyl-N-benzylammonium (DEBA) bis(trifluoromethanesulfonyl)imide (TFSI) ionic liquid (IL) in the temperature range between 160 and 307 K. Differential scanning calorimetry measurements indicate that such IL undergoes a glass transition around 210 K. DFT calculations allow us to assign all the experimental absorptions to specific vibrations of the DEBA cation or of the two conformers of the TFSI anion. We find that the vibration frequencies calculated by means of the PBE0 functional are in better agreement with the experimental ones than those calculated at the B3LYP level, largely used for the attribution of vibration lines of ionic liquids. Experimentally we show that, in the liquid state, the relative concentrations of the two conformers of TFSI depend on temperature through the Boltzmann factor and the energy separation,ΔH, is found to be≈2 kJ/mol, in agreement with previous calculations and literature. However, in the glassy state, the concentrations of the cis-TFSI and trans-TFSI remain fixed, witnessing the frozen state of this phase.

scholarly journals Characterization of S-layer proteins of Lactobacillus by FTIR spectroscopy and differential scanning calorimetry

2009 ◽  
Vol 50 (1) ◽  
pp. 68-77 ◽  
Author(s):  
P. Mobili ◽  
A. Londero ◽  
T.M.R. Maria ◽  
M.E.S. Eusébio ◽  
G.L. De Antoni ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Ftir Spectroscopy ◽  
Scanning Calorimetry

Characterization of Spin on Glass Using Thermo Analytical Techniques and Ftir Spectroscopy

1990 ◽  
Vol 204 ◽  
Author(s):  
M. Speciale ◽  
C. La Rosa ◽  
D. Grasso ◽  
A. Porto ◽  
P. Lanza ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Ftir Spectroscopy ◽  
Analytical Techniques ◽  
Experimental Results ◽  
Thermal Treatments ◽  
Cross Polarization ◽  
Scanning Calorimetry ◽  
Thermoanalytical Techniques ◽  
Different Temperatures

ABSTRACTThe curing of a commercial ethoxymethyl-phosphosiloxane at different temperatures and under various gas ambients was characterised using NMR, thermoanalytical techniques, and FTIR spectroscopy. DSC (Differential Scanning Calorimetry) and DTG (Differential Thermo Gravimetry) were employed to characterize the reactions that occur during thermal treatments in O2 or N2 atmospheres. FTIR spectroscopy and CP (Cross Polarization) 133C - NMR were used to detect the presence of the hydroxyl and organic groups in the cured samples. The experimental results identified three different temperatures (400,580,700°C) that define important stages of the curing reaction. In particular, for annealing at temperatuires up to 580°C in 02, DSC, DTG and FTIR spectra showed the elimination of the organic groups. However, when the annealing was carried out in N2 up to 700°C, these groups are retained.

Curing Kinetics of Silicone Epoxy Resin Containing Fluorene

2014 ◽  
Vol 936 ◽  
pp. 28-33 ◽  
Author(s):  
Wei Xing Deng ◽  
Yuan Wei Zhong ◽  
Jie Qin ◽  
Xue Bing Huang ◽  
Jin Wen Peng
Keyword(s):  
Activation Energy ◽  
Differential Scanning Calorimetry ◽  
Ftir Spectroscopy ◽  
Epoxy Resin ◽  
1H Nmr ◽  
Chemical Structure ◽  
Curing Kinetics ◽  
Curing Agent ◽  
Scanning Calorimetry ◽  
Kinetics Of

A new epoxy resin based on dichlorosilane and 9,9-bis (4-hydroxyphenyl) fluorene was synthesized to produce a highly heat-resistant network. The chemical structure was characterized with FTIR spectroscopy and 1H-NMR. 4-4′-Diaminodiphenylsulfone (DDS) was used as the curing agent. The curing kinetics of different epoxy/DDS systems were investigated using non-isothermal differential scanning calorimetry (DSC). The results showed that the values of activation energy (E) were affected by the chemical structure of epoxy resin, and BPEBF exhibited lower curing reactivity towards DDS compared to E-51.

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