Real Time Measurement of Functional Groups Substitution on Fluorocarbon Surface by ATR FT-IR

2004 ◽  
Vol 843 ◽  
Author(s):  
Yuki Sato ◽  
Masataka Murahara
Keyword(s):  
Contact Angle ◽  
Formic Acid ◽  
Real Time ◽  
Functional Groups ◽  
Attenuated Total Reflectance ◽  
Untreated Sample ◽  
Total Reflectance ◽  
Real Time Measurement ◽  
Hydrophilic Group ◽  
Ft Ir

ABSTRACTThe photochemical reaction process steps in substituting the functional groups on the surface of fluorocarbon [FEP] by irradiating an Xe2 excimer lamp on water or formic acid and FEP placed on the attenuated total reflectance [ATR] prism, has been measured in real time. These steps include, water photo-dissociation, the defluorination of the FEP and the hydrophilic group substitution.In case of formic acid, the absorption peaks of the -CHO in the region of 2940 cm−1 and the -COOH in the region of 1710 cm−1 decreased respectively by photo dissociation, but that of the -OH in the region of 3300cm−1 increased. The results indicated that the -CHO and -COOH have turned to -OH.Furthermore, the contact angle with water was measured. When compared to the untreated sample, whose contact angle was 110 degrees, the contact angle of the sample treated with water and the Xe2 lamp irradiation for 25 minutes became 31 degrees, and that of the sample modified with formic acid and the lamp irradiated for 25 minutes further improved to 17 degrees. This implies that the hydrophilic groups were produced more in formic acid than in water.

Real time measurement of photochemical surface reactions by using a total reflection prism

2005 ◽  
Vol 890 ◽  
Author(s):  
Yuki Sato ◽  
Yuji Sato ◽  
Masataka Murahara
Keyword(s):  
Contact Angle ◽  
Real Time ◽  
Irradiation Time ◽  
Ammonia Solution ◽  
Attenuated Total Reflectance ◽  
Untreated Sample ◽  
Ammonia Water ◽  
Real Time Measurement ◽  
Reaction Solution ◽  
Reaction Processes

ABSTRACTThe photochemical reaction processes, i.e., photo-dissociation of a reaction solution, defluorination of fluorocarbon [FEP], and substitution of a hydrophilic group, were measured in real time, when irradiating a Xe2 excimer lamplight on the water or ammonia solution as a reaction solution and FEP placed on the attenuated total reflectance [ATR] prism. In case of ammonia solution, with the increase in irradiation time, the absorption peaks of 3300 cm−1 and 1650 cm−1 gradually decreased, and the new absorption of -CF2-NH2 gradually appeared at 1410 cm−1, which presented the strongest absorption after UV irradiation for 25 minutes. The results indicate that the ammonia water has turned to amino groups. In addition, the contact angle of water was measured. When compared to the untreated sample, whose contact angle was 110 degrees, the contact angle of the sample treated with water became 31 degrees after the Xe2 lamp irradiation for 25 minutes, and that of the sample modified by ammonia water further improved to 27 degrees after the irradiation for 25 minutes.

Molecular Orientation Study of the Drying of Latex in Real Time Using the Variable-Angle Attenuated Total Reflectance Technique

2002 ◽  
Vol 56 (10) ◽  
pp. 1251-1258 ◽  
Author(s):  
Eun-Mi Shin ◽  
Jack L. Koenig
Keyword(s):  
Real Time ◽  
Film Formation ◽  
Polymer Chains ◽  
Attenuated Total Reflectance ◽  
Total Reflectance ◽  
Dichroic Ratio ◽  
Variable Angle ◽  
Orientation Function ◽  
Ft Ir ◽  
The Fourier Transform

The changes in orientation of polymer chains during the drying of latex have been studied. The Fourier transform infrared spectroscopy-attenuated total reflectance (FT-IR ATR) technique was used to obtain dichroic ratios. The variable-angle ATR technique was used to profile the dichroic ratio changes at different depths in the films. Using the dichroic ratio and the Hermans orientation function, it was possible to monitor the orientation changes of the polymer chains during latex drying in real time. New insights into the film formation process during the different stages of drying and condensation were obtained.

scholarly journals Synthesis of epoxy resins derivatives of naphthalene-2,7-diol and their cross-linked products

2019 ◽  
Vol 138 (6) ◽  
pp. 4349-4358 ◽  
Author(s):  
K. Fila ◽  
M. Gargol ◽  
M. Goliszek ◽  
B. Podkościelna
Keyword(s):  
Fourier Transform ◽  
Epoxy Resins ◽  
Attenuated Total Reflectance ◽  
Cross Linking ◽  
Total Reflectance ◽  
Before And After ◽  
Ft Ir ◽  
The Cross ◽  
Derivatives Of ◽  
Epoxy Groups

Abstract The aim of this study was the synthesis of three different epoxy compounds based on naphthalene-2,7-diol (2,7-NAF.EP, 2,7-NAF.WEP, 2,7-NAF.P.EP) and then their cross-linking by triethylenetetramine (TETA). All epoxides were prepared by the reaction of naphthalene-2,7-diol with epichlorohydrin but under different conditions and with other catalysts. The structures of the obtained compounds before and after the cross-linking reactions were confirmed by the attenuated total reflectance Fourier transform infrared spectroscopy (ATR/FT-IR). The ATR/FT-IR spectra of cross-linked compounds show disappearance of the C–O–C bands (about 915 cm−1) derived from the epoxy groups. DSC and TG/DTG measurements indicated that the obtained materials possess good thermal resistance; they are stable up to about 250 °C. The hardness of the cross-linked products was determined using the Shore D method. The highest value of hardness was obtained for the 2,7-NAF.EP-POL. Additionally, the UV–Vis absorption spectra of the obtained polymers were registered and evaluated.

scholarly journals Real-Time Measurement of Ammonia (NH3) in Artillery Smoke Using a Passive FT-IR Remote Sensor

ACS Omega ◽  
2019 ◽  
Vol 4 (16) ◽  
pp. 16768-16773
Author(s):  
Jong-Seon Kim ◽  
Hyunwoo Nam ◽  
Hyeon Jeong Kim ◽  
Jae Hwan Lee ◽  
Byeong Hwang Park
Keyword(s):  
Real Time ◽  
Time Measurement ◽  
Real Time Measurement ◽  
Remote Sensor ◽  
Ft Ir

Real-time liquid-phase organic reaction monitoring with mid-infrared attenuated total reflectance dual frequency comb spectroscopy

2019 ◽  
Vol 356 ◽  
pp. 39-45 ◽  
Author(s):  
Daniel I. Herman ◽  
Eleanor M. Waxman ◽  
Gabriel Ycas ◽  
Fabrizio R. Giorgetta ◽  
Nathan R. Newbury ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Real Time ◽  
Frequency Comb ◽  
Attenuated Total Reflectance ◽  
Reaction Monitoring ◽  
Dual Frequency ◽  
Organic Reaction ◽  
Mid Infrared ◽  
Total Reflectance

Observations of surface-mediated reduction of Pu(VI) to Pu(IV) on hematite nanoparticles by ATR FT-IR

2015 ◽  
Vol 103 (8) ◽  
Author(s):  
Hilary P. Emerson ◽  
Brian A. Powell
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Attenuated Total Reflectance ◽  
Mineral Surfaces ◽  
Hematite Nanoparticles ◽  
Total Reflectance ◽  
Ft Ir ◽  
First Time ◽  
Mediated Reduction

AbstractPrevious studies have shown that mineral surfaces may facilitate the reduction of plutonium though the mechanisms of the reduction are still unknown. The objective of this study is to use batch sorption and attenuated total reflectance Fourier transform infrared spectroscopy experiments to observe the surface-mediated reduction of plutonium on hematite nanoparticles. These techniques allow for in situ measurement of reduction of plutonium with time and may lead to a better understanding of the mechanisms of surface mediated reduction of plutonium. For the first time, ATR FT-IR peaks for Pu(VI) sorbed to hematite are measured at ∼ 916 cm

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