Functional transformation of Fourier-transform mid-infrared spectrum for improving spectral specificity by simple algorithm based on wavelet-like functions

Palencia, Manuel

doi:10.1016/j.jare.2018.05.009

Cited by 73 publications

(29 citation statements)

References 17 publications

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“…1750 cm −1 was -C=O-absorption [18,19]. 1441 cm −1 was the -COO absorption peak [20]. Obvious CF 3 absorption peak appeared at 1110 cm −1 [21].…”

Section: Infrared Spectrum Of Color Paste Corresponding To Coatingmentioning

confidence: 95%

Effect of Different Color Paste on Properties of Fluorine Resin/Aluminum Infrared Low Emissivity Coating

Yan

2020

Coatings

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The effect of the four kinds of red, dark yellow, purple, and black pastes on the properties of fluorine resin/aluminum low emissivity coating was studied. The infrared emissivity coatings with red and black pastes were higher than the coatings with dark yellow and purple pastes. The hardness of the coatings with red, dark yellow, and purple color pastes was 6H, and that with black pastes was 6B. The adhesion and impact resistance of dark yellow coating was better, followed by red and purple, and the adhesion and impact resistance of black coating was the worst. Electrochemical polarization curves indicated that fluorine resin coatings with purple paste had better corrosion resistance. After the salt water resistance test, there was no obvious loss of light in the coatings with the four kinds of color pastes. The purple paste coating had no obvious loss of light and less bubble, suggesting that the fluorine resin/aluminum low emissivity coating with purple paste had better performance. The results of this study provide a new prospect for the application of infrared low emissivity coating in infrared stealth and compatibility with visible light.

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“…1750 cm −1 was -C=O-absorption [18,19]. 1441 cm −1 was the -COO absorption peak [20]. Obvious CF 3 absorption peak appeared at 1110 cm −1 [21].…”

Section: Infrared Spectrum Of Color Paste Corresponding To Coatingmentioning

confidence: 95%

Effect of Different Color Paste on Properties of Fluorine Resin/Aluminum Infrared Low Emissivity Coating

Yan

2020

Coatings

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“…Otra banda característica es la del grupo de los alcanos, en este caso polímeros de carbohidratos, con frecuencias de 2939 ~ 2946 cm -1 encontrado en todas las gomas de algarrobo, menos en la muestra de goma arábiga (López, Córdova, Goycoolea, Valdez, Onofre y Mendoza, 2012). Esto se debe a la presencia de moléculas de agua en la mezcla, lo que usualmente genera una expansión de la señal del grupo O-H solapando otras absorciones de importancia (Palencia, 2018). La aplicación de la segunda derivada ayuda a la separación de picos solapados, sin embargo al ser un procedimiento matemático este posee limitaciones, lo cual podría resultar en una distorsión del espectro (Rieppo, Saarakkala, Närhi, Helminen, Jurvelin y Rieppo.…”

Section: Análisis Por Espectroscopia Irunclassified

ANÁLISIS POR ESPECTROSCOPIA DE INFRARROJOS (FTIR) DEL EXUDADO DEL ÁRBOL DE ALGARROBO Prosopis juliflora (FABACEAE)

Gallegos

López

Meneses

2020

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La goma de algarrobo es un exudado proveniente de las ramas y troncos de los árboles del género Prosopis, tiene una semejanza a la goma arábiga y posee potenciales aplicaciones en el área farmacéutica, de alimentos, industria cosmética, etc. El algarrobo se encuentra en regiones secas y semi secas del Ecuador. En el presente trabajo se analizaron por espectroscopia FTIR, tres muestras de goma de algarrobo y una muestra de goma arábiga grado alimenticio, para la obtención y comparación de espectros. Las muestras provenientes del árbol Prosopis juliflora, fueron recolectadas en tres áreas de la provincia de Manabí-Ecuador: Bahía de Caráquez (Zona 1), Portoviejo (Zona 2) y Puerto López (Zona 3). Se obtuvieron espectros FTIR de cada una de las muestras y se compararon con espectros de la bibliografía. Los espectros de infrarrojos presentaron semejanza entre los dos tipos de gomas, algarrobo y arábiga, así como con los de la bibliografía; se efectuó una comparación analítica entre los dos tipos para la obtención de porcentajes de correlación, estos fueron de 80,37; 79,83 y 79,66 % para las zonas 1, 2 y 3 respectivamente. Los resultados obtenidos abren una línea de investigación para la posible utilización de la goma de algarrobo ecuatoriana como una nueva y accesible alternativa al uso de la goma arábiga.

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“…Since feed and stripping phases are aqueous systems, with a relatively low concentration of solutes, spectra were transformed and analyzed functional-enhanced derivative spectroscopy or FEDS transform (FEDS) in order to increase the spectral resolution and achieve the identification of highly overlapped signals. [33,34] Figure 2. Rates of flux for gallic acid in the feed phase, J1 (A), membrane phase, Jm (B) and stripping phase, J2 (C).…”

Section: Study Of Distribution and Transport Of Polyphenols By Bulk Liquid Membranementioning

confidence: 99%

Study of time-dependent diffusion coefficient membrane systems and its application to extractions from sugarcane bagasse

Palencia¹,

Mora²,

Lerma³

2019

J. Sci. Technol. Appl.

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It is widely recognized that the mathematical modeling of mass transfer in membrane processes is an essential component not only for understanding the underlying mechanisms associated with the transport, but also that is a powerful tool for design, cost estimation, control and scale-up of extraction processes. Here, a simple methodological approach for the study and description of diffusional changes during the extraction and transport processes in liquid membrane systems is developed and evaluated in the extraction and transport of gallic acid from aqueous solutions. It is concluded that, in comparison with the use of flux and distribution coefficient in function on time, a more sensitive description of diffusion coefficient can be performed using mass-transport coefficient in function on the time. In addition, it is concluded that, during the polyphenol extraction by liquid membrane based on castor oil and Cyanex 921, transportation can be affected by dissolution of membrane phase in the feed phase, and evidenced by a negative value of g in function of time. Diffusion coefficientLiquid membrane Mass-transport coefficient Coupled transport M.

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Functional transformation of Fourier-transform mid-infrared spectrum for improving spectral specificity by simple algorithm based on wavelet-like functions

Abstract: Graphical abstract

Cited by 73 publications

References 17 publications

Effect of Different Color Paste on Properties of Fluorine Resin/Aluminum Infrared Low Emissivity Coating

Effect of Different Color Paste on Properties of Fluorine Resin/Aluminum Infrared Low Emissivity Coating

ANÁLISIS POR ESPECTROSCOPIA DE INFRARROJOS (FTIR) DEL EXUDADO DEL ÁRBOL DE ALGARROBO Prosopis juliflora (FABACEAE)

Study of time-dependent diffusion coefficient membrane systems and its application to extractions from sugarcane bagasse

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