Sublimation enthalpy of homemade peroxide explosives using a theoretically supported non-linear equation

Espinosa-Fuentes, Eduardo; Castro-Suarez, John R.; Meza-Payares, Daniel; Pacheco‐Londoño, Leonardo C.; Hernández‐Rivera, Samuel P.

doi:10.1007/s10973-014-4088-5

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…The experimental thermal profile of nitrobenzoic and acetyl salicylic acid [23] compounds showed high concordance with one of the models in Table 1. This behavior is reflected in the R 2 value, which was closer to one.…”

Section: Discussionsupporting

confidence: 54%

“…As stated above, the proposed models were obtained using different approaches of the A. Einstein distribution [23] is as follows: below 50 K and above 300 K, the heat capacity change at constant pressure (C p ) is constant, from 30 to 70 K it behaves as a straight line, and between 0 and 70 K as a quadratic function. In addition to these approaches, a model using the full Einstein's equation was also proposed (see Fig.…”

Section: Mathematical Deduction Of the Thermal Profile Modelmentioning

confidence: 99%

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Nonlinear models of the experimental thermal profile

Espinosa-Fuentes

Pájaro-Payares

Colpas-Castillo

et al. 2015

J Therm Anal Calorim

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This manuscript deals with a mathematical analysis of the functions that should be used in the Clausius-Clapeyron thermodynamic modeling, which is usually modeled as a linear fit; this research emphasizes that the thermal models are nonlinear even taking into account the heat capacity functions as a constant. Specifically, the mathematical analysis of the thermal models proposes what equations should be used depending on the type of enthalpy function. Consequently, the enthalpy functions depend on the model of the heat capacity proposed by Albert Einstein. The magnitude of the errors that would be committed by using linear regressions was also estimated, as is the case for the vast majority of publications in this area. This study also shows how the models behave in a wide temperature range and how they are becoming apparently linear as the temperature range decreases.

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Section: Discussionsupporting

confidence: 54%

Section: Mathematical Deduction Of the Thermal Profile Modelmentioning

confidence: 99%

Nonlinear models of the experimental thermal profile

Espinosa-Fuentes

Pájaro-Payares

Colpas-Castillo

et al. 2015

J Therm Anal Calorim

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show abstract

“…As stated above, the proposed models were obtained using different approaches of the A. Einstein distribution [20], which were considered as follows: at low (below 50 o K) and high (above 300 o K) temperatures, the heat capacity change at constant pressure (Cp) behaves as a constant, from 30 o K to 70 o K behaves as a straight line, and at temperatures between 0 o K and 70 o K behaves as a quadratic function; In addition to these approaching, It was also proposed a model using Full Einstein's equation (see Figure 1), by finding the different thermodynamic models of which several of them have been previously used in related studies. An important result, is that the thermodynamical model considering the Cp as a constant and the model considering the full Einstein function are significantly similar, which after considering the combined log-exponential term negligible (eq.8), both expressions are identical.…”

Section: Mathematical Deduction Of the Thermal Decaying Modelmentioning

confidence: 99%

Non Linear Thermal Decaying Functions

Fuentes¹,

Cervantes²,

Castillo³

2015

Proceedings of the 13th Latin American and Caribbean Conference for Engineering and Technology Engineering Education Facing The

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The present manuscript deals with a deep mathematical analysis of the functions that should be used in the Clausius Clapeyron thermodynamic modelling, which is usually modelled linearly, this research emphasizes that the thermal models are nonlinear even taking into account the heat capacities as a constant. Specifically, the mathematical analysis of the thermal decaying models proposes what equations should be used depending on the type of enthalpy function. Consequently, the enthalpy functions depend on the model of the heat capacity proposed by Albert Einstein. The magnitude of the errors that would be committing by using linear regressions on experimental data were also estimated; as is the case for the vast majority of publications in this area. The study also shows how the models behave in wide temperature range; and how they are becoming apparent linear as the temperature range decreases.

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“…Sin embargo, en su proceso de análisis químicos, pasos de preparación de muestras son llevados a cabo alargando el tiempo de análisis y dificultando su uso en el campo. En los últimos años, métodos analíticos basados en el uso de la espectroscopia en especial Infrarrojo (IR) y Raman han demostrado ser útiles para el análisis de diferentes compuestos quimicos [11][12][13], incluyendo drogas en diferentes productos farmacéuticos, desde el proceso de su manufactura hasta validación del producto final [14][15]. La espectroscopia IR y Raman tienen la capacidad de producir vibraciones entre los átomos de un compuestos, por lo que se le llama comúnmente espectroscopia vibracional, de esta manera podemos obtener información molecular característica de una determinada sustancia química.…”

Section: Introductionunclassified

Vibrational detection of acetaminophen in commercials tablets by ATR-FTIR spectroscopy and Chemometrics

Castro-Suarez¹

2017

Proceedings of the 15th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Global Partnership F

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Acetaminophen (AAP) is active ingredient very used in many pharmaceutical preparations. AAP is a pain reliever and a fever reducer drug. Generally, it is used to treat many conditions such as headache, muscle aches, arthritis, backache, toothaches, colds, and fevers. Standard methods most used for AAP chemical detection are based on chromatography and spectrophotometry techniques, these methods generally imply a sample preparation step, while FTIR based methods do not. Hence, an analytical methods based on IR spectroscopy are very important for the pharmaceutical industry and law enforcement agency, given that allow obtain a way easy and fast molecular information for its detection. In effort for attaining a reliable identification procedure for qualitative determination of AAP in different pharmaceuticals product, an additional chemometrics treatment of ATR-FTIR data is proposed. The proposed method was tested on solid samples containing API. The statistical routine of principal component analysis (PCA) yielded excellent results. The results show that the multivariate sensor is useful for detection of AAP in the drugs tested. Using the proposed method allowed to know if drug is present as desired product or it is counterfeit drugs.

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Sublimation enthalpy of homemade peroxide explosives using a theoretically supported non-linear equation

Cited by 6 publications

References 28 publications

Nonlinear models of the experimental thermal profile

Nonlinear models of the experimental thermal profile

Non Linear Thermal Decaying Functions

Vibrational detection of acetaminophen in commercials tablets by ATR-FTIR spectroscopy and Chemometrics

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