Influence of Dispersant on the Dispersion Stability of Nano-CoFe2O4 Refrigeration Oil

2011 ◽  
Vol 399-401 ◽  
pp. 430-438
Author(s):  
Guan Nan Li ◽  
Mei Bo Xing ◽  
Rui Xiang Wang
Keyword(s):  
Fourier Transform ◽  
Infrared Spectrum ◽  
High Stability ◽  
Fourier Transform Infrared ◽  
Dispersion Stability ◽  
Mass Ratio ◽  
Ft Ir ◽  
Mineral Lubricant ◽  
Observation Method ◽  
Surface Modified

Abstract. Adding dispersants like surfactants and polymers to modify nanoparticles surface is an effective way to enhance the dispersion stability of nanoparticles in refrigeration oil. In this paper, many groups of nano-CoFe2O4refrigeration oil were prepared. In order to obtain the most effective kind of dispersant and the optimum additive amount, sedimentation observation method was employed for evaluation of the dispersion stability of CoFe2O4nanoparticles in 3GS mineral lubricant. The spectral behavior of the surface modified nano-CoFe2O4was studied by Fourier transform infrared (FT-IR) spectrometer. It was revealed that the optimized mass ratio between nano-CoFe2O4and dispersant ratio is 2 to 5; a relatively appropriate dispersant for nano-CoFe2O4would be Tween40, Tween60, Span80, Span80; Tween60 was the best. It was also illustrated in the infrared spectrum that nano-CoFe2O4particles surface modified by Tween60 was connected by organic groups in Tween60. Thus, the particles changed from hydrophilic to lipophilic and performed good dispersity and high stability when dispersed in mineral refrigeration oil.

Preparation of a Novel Prepolymer of Polyurethane Acrylate

2012 ◽  
Vol 554-556 ◽  
pp. 153-156 ◽  
Author(s):  
Shu Zhen Tan ◽  
Yi Wang ◽  
Yi Fu Zhang ◽  
Wei Long Zhou
Keyword(s):  
Fourier Transform ◽  
Infrared Spectrum ◽  
Fourier Transform Infrared ◽  
Toluene Diisocyanate ◽  
Formaldehyde Resin ◽  
Hydroxyethyl Methacrylate ◽  
Hydroxyl Value ◽  
Polyurethane Acrylate ◽  
Methacrylate Group ◽  
Ft Ir

A new prepolymer of polyurethane acrylate (PUA) was synthesized from cyclohexanone- formaldehyde resin (CFR) with high hydroxyl value, toluene diisocyanate (TDI) and 2-hydroxyethyl methacrylate (HEMA) by using dibutyltion dilaurate as catalyst via two steps. The result from Fourier transform infrared spectrum (FT-IR) showed that methacrylate group was introduced into the terminal of CFR by using TDI as bridge and curable PUA was obtained. Then, the PUA was cured by using azodiisobutyronitrile as catalyst at 110-130°C for 2h. The resulting product has excellent solvent resistance.

Infrared Photoacoustic Spectroscopy of Conducting Polymers. I. Undoped and n-Doped Polyacetylene

1981 ◽  
Vol 35 (6) ◽  
pp. 557-559 ◽  
Author(s):  
Stephen M. Riseman ◽  
Stuart I. Yaniger ◽  
Edward M. Eyring ◽  
David Macinnes ◽  
Alan Graham Macdiarmid ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectrum ◽  
Conducting Polymers ◽  
Infrared Spectra ◽  
Photoacoustic Spectroscopy ◽  
Fourier Transform Infrared ◽  
Spectral Shifts ◽  
Ft Ir ◽  
Infrared Photoacoustic Spectroscopy

Fourier transform infrared photoacoustic (FT-IR-PA) spectroscopy has been used to obtain the first published infrared spectrum of a heavily n-doped polyacetylene. Comparisons are made with the FT-IR-PA spectrum of undoped polyacetylene. All the infrared peaks in the FT-IR-PA spectrum of undoped polyacetylene agree in wavelength to ±10 cm−1 with transmission infrared peaks previously assigned by Shirakawa and Ikeda. Spectral shifts and intensity differences between the n-doped and undoped polyacetylene are similar to changes noted previously in the infrared spectra of p-doped polyacetylenes.

Improvements of the Tensile Strength of Phenolic Resin Adhesive by Surface-Modified Nanocrystalline Cellulose

2014 ◽  
Vol 1073-1076 ◽  
pp. 43-46
Author(s):  
Hao Zhang ◽  
Xiao Chun Li ◽  
Ming Zhu ◽  
Liang Hong ◽  
Gao Li Chu
Keyword(s):  
Tensile Strength ◽  
Fourier Transform ◽  
Phenolic Resin ◽  
Fourier Transform Infrared ◽  
Nanocrystalline Cellulose ◽  
National Standard ◽  
Resin Adhesive ◽  
Wetting Property ◽  
Ft Ir ◽  
Surface Modified

In this study, the tensile strength of phenolic resin adhesive was reinforced by the use of surface-modified nanocrystalline cellulose (NCC). The original NCC was modified by 3-methacryloxy-propyltrimethoxysilane (MPS) to improve the wetting property with the phenolic resin adhesive. The phenolic resin adhesive with surface-modified NCC was analyzed by Fourier transform infrared (FT-IR). Tensile strength of the modified phenolic resin adhesive was tested according to Chinese National Standard GB/T 2567-2008. The results showed that the wetting property between NCC modified by MPS and phenolic resin adhesive was increased by 21.7% and the tensile strength of phenolic resin adhesive with modified NCC was enhanced from 6.25 MPa to 15.97 MPa.

FR-IR Molecular Microanalysis System

1990 ◽  
Vol 48 (2) ◽  
pp. 270-271
Author(s):  
John A. Reffner ◽  
William T. Wihlborg
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Integrated System ◽  
Morphological Examination ◽  
Fully Integrated ◽  
Ir Microscopy ◽  
Normal Functions ◽  
Infrared Microspectroscopy ◽  
Infrared Spectral ◽  
Ft Ir

The IRμs™ is the first fully integrated system for Fourier transform infrared (FT-IR) microscopy. FT-IR microscopy combines light microscopy for morphological examination with infrared spectroscopy for chemical identification of microscopic samples or domains. Because the IRμs system is a new tool for molecular microanalysis, its optical, mechanical and system design are described to illustrate the state of development of molecular microanalysis. Applications of infrared microspectroscopy are reviewed by Messerschmidt and Harthcock.Infrared spectral analysis of microscopic samples is not a new idea, it dates back to 1949, with the first commercial instrument being offered by Perkin-Elmer Co. Inc. in 1953. These early efforts showed promise but failed the test of practically. It was not until the advances in computer science were applied did infrared microspectroscopy emerge as a useful technique. Microscopes designed as accessories for Fourier transform infrared spectrometers have been commercially available since 1983. These accessory microscopes provide the best means for analytical spectroscopists to analyze microscopic samples, while not interfering with the FT-IR spectrometer’s normal functions.

Fourier transform infrared spectrum of 13C32S2 in the 3v3 band region

1996 ◽  
Vol 89 (4) ◽  
pp. 1145-1155
Author(s):  
JACQUES WALRAND ◽  
GHISLAIN BLANQUET ◽  
JEAN-FRANCOIS BLAVIER ◽  
HARALD BREDOHL ◽  
IWAN DUBOIS
Keyword(s):  
Fourier Transform ◽  
Infrared Spectrum ◽  
Fourier Transform Infrared ◽  
Band Region

On-Chip Micro–Electro–Mechanical System Fourier Transform Infrared (MEMS FT-IR) Spectrometer-Based Gas Sensing

2016 ◽  
Vol 70 (5) ◽  
pp. 897-904 ◽  
Author(s):  
Mazen Erfan ◽  
Yasser M Sabry ◽  
Mohammad Sakr ◽  
Bassem Mortada ◽  
Mostafa Medhat ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Mechanical System ◽  
Gas Sensing ◽  
Fourier Transform Infrared ◽  
Micro Electro Mechanical System ◽  
Ft Ir ◽  
On Chip

Tetrachlorodibenzo-p-Dioxin Isomer Differentiation by Capillary Gas Chromatography Fourier Transform-Infrared Spectroscopy

1987 ◽  
Vol 41 (5) ◽  
pp. 809-820 ◽  
Author(s):  
James Grainger ◽  
Leslie T. Gelbaum
Keyword(s):  
Gas Chromatography ◽  
Fourier Transform ◽  
Vapor Phase ◽  
Valence Bond ◽  
Fourier Transform Infrared ◽  
Molecular Geometry ◽  
Ether Linkage ◽  
Relative Electron ◽  
Ft Ir ◽  
Infrared Frequencies

Reference infrared vapor-phase spectra of the 22 tetrachlorodibenzo-dioxin (TCDD) isomers were recorded at low microgram concentrations. These reference spectra of synthetic mixture components separated chromatographically or by spectral subtraction exhibit distinct infrared spectra for each isomer. The infrared frequencies are delineated in correlation tables and are interpreted in terms of substitution patterns which determine the strength of the ether linkage. Absorbance values in the 1330–1280 cm−1 (C-O-C asymmetric stretch) region correlate with specific substitution patterns and molecular geometry. Relative electron-withdrawing capacities for chlorinated aromatic rings in TCDD isomers were estimated on the basis of relative capacities determined for model compounds. Qualitative correlations were established between electron-withdrawing capacities and the effects of resonance and field interactions on the ether linkage absorption frequencies of individual TCDD isomers. Gas chromatography Fourier transform infrared (GC/FT-IR) isomer assignments are generally consistent with those obtained by proton Fourier transform nuclear magnetic resonance (1H FT/NMR) and flame ionization gas chromatography (GC/FID). A chromatographically independent method of assigning TCDD isomer structures on the basis of ether linkage asymmetric stretching frequencies was established by utilization of valence-bond approximations. GC/FT-IR assignments for several TCDD isomers differ from isomer assignments in previously published results. A user-generated, vapor-phase reference library, containing individual TCDD spectra and spectra of isomer pairs that are incompletely resolved on chromatographic columns, correctly identified each isomer in variety of mixtures by means of a software algorithm.

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