The effect of particle size on fourier-transform infrared photoacoustic spectra

1986 ◽  
Vol 146 ◽  
pp. 25-39 ◽  
Author(s):  
Charles Q. Yang ◽  
William G. Fateley
Keyword(s):  
Particle Size ◽  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Photoacoustic Spectra ◽  
Effect Of Particle Size

Mixed Alkali Halide Dilution Matrices for Diffuse Reflectance Infrared Spectrometry: Effect of Particle Size

1989 ◽  
Vol 43 (8) ◽  
pp. 1293-1294 ◽  
Author(s):  
Mollie L. E. Tevrucht ◽  
Peter R. Griffiths
Keyword(s):  
Particle Size ◽  
Fourier Transform ◽  
Infrared Spectra ◽  
Alkali Halide ◽  
Diffuse Reflectance ◽  
Fourier Transform Infrared ◽  
Infrared Spectrometry ◽  
Mixed Alkali ◽  
Effect Of Particle Size ◽  
Diffuse Reflectance Infrared

Diffuse reflectance Fourier transform infrared spectra of coal diluted in two different alkali halide matrices were compared. Pure KBr and mixed CsI/KBr were tested for use as dilution matrices. When the variable of particle size was controlled, KBr was found to be the better diluent.

scholarly journals KARAKTERISASI NANOPARTIKEL EKSTRAK ETANOL KAYU MANIS (Cinnamomum burmanii) DENGAN KITOSAN SODIUM TRIPOLIFOSFAT SEBAGAI KANDIDAT ANTIOKSIDAN

2020 ◽  
Vol 13 (2) ◽  
Author(s):  
Irma Antasionasti ◽  
Imam Jayanto ◽  
Surya Sumantri Abdullah ◽  
Jainer Pasca Siampa
Keyword(s):  
Antioxidant Activity ◽  
Particle Size ◽  
Fourier Transform ◽  
Sulfonic Acid ◽  
Ethanol Extract ◽  
Fourier Transform Infrared ◽  
Total Phenolic ◽  
Total Flavonoids Content ◽  
Reducing Activity

Ekstrak etanol kayu manis memiliki kandungan fenol yang tinggi yang berpotensi sebagai antioksidan tetapi memiliki bioavailabilitas yang rendah pada kondisi ukuran partikel yang besar. Oleh karena itu, dilakukan analisis karakteristik nanopartikel ekstrak etanol kayu manis. Tujuan penelitian untuk membuat dan mengevaluasi karakteristik nanopartikel ekstrak kayu manis sebagai kandidat antioksidan secara in vitro. Preparasi nanopartikel ekstrak etanol kayu manis dengan metode gelasi ionik. Nanopartikel ekstrak etanol kayu manis memiliki ukuran partikel sebesar 400,3 nm dengan potential zeta +6,60 mV. Spektra Fourier Transform Infrared (FTIR) menunjukkan adanya gugus hidroksil dan gugus amida dari kitosan dan gugus fosfat dari STPP. Studi aktivitas antioksidan secara in vitro dengan metode 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid (ABTS) dan reduksi besi III menunjukkan bahwa nanopartikel ekstrak etanol kayu manis memiliki aktivitas antioksidan yang lebih kecil dibandingkan ekstrak tetapi masih dalam kategori sangat kuat. Aktivitas antioksidan yang diberikan dipengaruhi oleh kandungan total fenolik dan total flavonoid secara berturut-turut sebesar 75,685 ± 1,408 % EAG dan 60,546 ± 0,670 % EK untuk ekstrak etanol kayu manis serta 61,845 ± 0,529 % EAG dan 57,939 ± 0,446 % EK untuk nanopartikel ekstrak etanol kayu manis. Penerapan teknologi nanopartikel pada ekstrak etanol kayu manis melalui ikat silang antara kitosan-TPP dapat mempertahankan aktivitas antioksidannya.ABSTRACT Ethanol extract of cinnamon has a high phenol content which is potential as an antioxidant but has a low bioavailability under conditions of large particle size. Therefore, nanoparticles were prepared for the ethanol extract of cinnamon. The aim of this research was to make and evaluate the characteristics of cinnamon nanoparticles as antioxidant candidates in vitro. The cinnamon nanoparticles were prepared using the ionic gelation method. Cinnamon nanoparticles has a particle size of 400,3 nm with a zeta potential of +6,60 mV. Fourier Transform Infrared (FTIR) spectra showed the presence of a hydroxyl and amida group from chitosan and a phosphate group from STPP. In vitro antioxidant activity studies with the 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid (ABTS) method and ferric reducing activity power showed that cinnamon nanoparticle has smaller antioxidant activity than the extract but is still in the very strong category. The antioxidant activity given is influenced by the total phenolic and total flavonoids content 75.685 ± 1.408% EAG and 60.546 ± 0.670% EK for cinnamon ethanol extract. and 61.845 ± 0.529% EAG and 57.939 ± 0.446% EK for cinnamon ethanol extract nanoparticles, respectively The application of nanoparticle technology to the ethanol extract of cinnamon through chitosan-TPP cross-linking can maintain its antioxidant activity.

Transformations to reduce the effect of particle size in mid-infrared spectra of biomass

The Analyst ◽  
2018 ◽  
Vol 143 (21) ◽  
pp. 5191-5201
Author(s):  
Borja Cantero-Tubilla ◽  
Larry P. Walker
Keyword(s):  
Particle Size ◽  
Fourier Transform ◽  
Chemical Composition ◽  
Ftir Spectroscopy ◽  
Infrared Spectra ◽  
Mid Infrared ◽  
Powerful Technique ◽  
Effect Of Particle Size ◽  
Chemical Pretreatments

Fourier Transform InfraRed (FTIR) spectroscopy is a very powerful technique for the characterization of the chemical composition of biomass and its modifications occurring during thermochemical and chemical pretreatments.

Raman and Fourier-transform infrared photoacoustic spectra of granularZrO2

1997 ◽  
Vol 55 (14) ◽  
pp. 8847-8851 ◽  
Author(s):  
Liu Fangxin ◽  
Yang Jinlong ◽  
Zhao Tianpeng
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Photoacoustic Spectra

A Novel Calibration Method for the Quantification of Respirable Particles in Mining Scenarios Using Fourier Transform Infrared Spectroscopy

2020 ◽  
pp. 000370282096806
Author(s):  
Robert Stach ◽  
Teresa Barone ◽  
Emanuele Cauda ◽  
Boris Mizaikoff
Keyword(s):  
Particle Size ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Sample Preparation ◽  
Least Squares ◽  
Partial Least Squares ◽  
Partial Least Squares Regression ◽  
Fourier Transform Infrared ◽  
Respirable Dust ◽  
Least Squares Regression

The exposure of mining workers to crystalline particles, e.g., alpha quartz in respirable dust, is a ubiquitous global problem in occupational safety and health at surface and underground operations. The challenge of rapid in-field monitoring for direct assessment and adoption of intervention has not been solved satisfactorily to date, as conventional analytical methods such as X-ray diffraction and infrared spectroscopy require laboratory environments, complex system handling, tedious sample preparation, and are limited by, e.g., addressable particle size. A novel monitoring approach was developed for potential in-field application enabling the quantification of crystalline particles in the respirable regime based on transmission infrared spectroscopy. This on-site approach analyzes samples of dust in ambient air collected onto PVC filters using respirable dust sampling devices. In the present study, we demonstrate that portable Fourier transform infrared (FT-IR) spectroscopy in combination with multivariate data analysis provides a versatile tool for the identification and quantification of minerals in complex real-world matrices. Without further sample preparation, the loaded filters are immediately analyzed via transmission infrared spectroscopy, and the mineral amount is quantified in real-time using a partial least squares regression algorithm. Due to the inherent molecular selectivity for crystalline as well as organic matrix components, infrared spectroscopy uniquely allows to precisely determine the particle composition even in complex samples such as dust from coal mines or clay-rich environments. For establishing a robust partial least squares regression model, a method was developed for generating calibration samples representative in size and composition for respirable mine dust via aerodynamic size separation. Combined with experimental design strategies, this allows tailoring the calibration set to the demands of air quality management in underground mining scenarios, i.e., the respirable particle size regime and the matrix of the target analyte.

scholarly journals Synthesis and evaluation of a novel monomeric amine as sodium montmorillonite swelling inhibitor

2017 ◽  
Vol 36 (1-2) ◽  
pp. 655-668 ◽  
Author(s):  
Weichao Du ◽  
Xiaolin Pu ◽  
Jinsheng Sun ◽  
Xiao Luo ◽  
Yanna Zhang ◽  
...  
Keyword(s):  
Particle Size ◽  
Fourier Transform ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Fresh Water ◽  
Fourier Transform Infrared ◽  
X Ray Diffraction ◽  
Sodium Montmorillonite ◽  
X Ray ◽  
Bromide Solution

A novel monomeric amine sodium montmorillonite swelling inhibitor: N1, N2-ditetradecy- N1, N1, N2, N2-tetrakis (2-hydroxyethyl) ethane-1,2-diaminium bromide was obtained from diethanolamine, 1-bromotetradecane, and 1, 2-dibromoethane. N1, N2-ditetradecy- N1, N1, N2, N2-tetrakis (2-hydroxyethyl) ethane-1,2-diaminium bromide was characterized by means of Fourier transform infrared, 1H NMR spectroscopy, elemental analysis, linear swelling tests, particle size distribution tests, X-ray diffraction, and thermogravimetric. Linear swelling tests showed that the swelling height of sodium montmorillonite in 1.0 wt% N1, N2-ditetradecy- N1, N1, N2, N2-tetrakis (2-hydroxyethyl) ethane-1,2-diaminium bromide solution was only 2.0 mm after 16 h (fresh water was 5.0 mm). Particle size distribution tests exhibited that the median diameter and mean particle size of sodium montmorillonite in 1.0 wt% N1, N2-ditetradecy- N1, N1, N2, N2-tetrakis (2-hydroxyethyl) ethane-1,2-diaminium bromide solution obviously increased to 16.1 and 85.4 µm, respectively (fresh water was 8.1 and 21.8 µm). In thermogravimetric tests, in comparison with pure sodium montmorillonite, the decrease of water content in sodium montmorillonite/ N1, N2-ditetradecy- N1, N1, N2, N2-tetrakis (2-hydroxyethyl) ethane-1,2-diaminium bromide indicated N1, N2-ditetradecy- N1, N1, N2, N2-tetrakis (2-hydroxyethyl) ethane-1,2-diaminium bromide expelled the water molecules out of the interlayer, which was beneficial to wellbore stability. Fourier transform infrared spectra of certain concentration N1, N2-ditetradecy- N1, N1, N2, N2-tetrakis (2-hydroxyethyl) ethane-1,2-diaminium bromide/sodium montmorillonite indicated the successful physical adsorption and interaction between N1, N2-ditetradecy- N1, N1, N2, N2-tetrakis (2-hydroxyethyl) ethane-1,2-diaminium bromide with sodium montmorillonite. In addition, the results of X-ray diffraction tests showed the obtained 1.0 wt% N1, N2-ditetradecy- N1, N1, N2, N2-tetrakis (2-hydroxyethyl) ethane-1,2-diaminium bromide solution could remarkably reduce the interlayer distance of wet sodium montmorillonite (from 1.94 to 1.37 nm).

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