Determination of the hygroscopic equilibrium and isosteric heat of aji chili pepper

Andrade, Ednilton Tavares de; Figueira, Vitor G.; Teixeira, Luciana Pinto; Taveira, José Henrique da Silva; Borém, Flávio Meira

doi:10.1590/1807-1929/agriambi.v21n12p865-871

Cited by 6 publications

(5 citation statements)

References 16 publications

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“…The lighter column color corresponds to higher water content. Experimental results fit well with Sigma-Copace model [17] (Figure S4, Supporting Information). d) Dynamic microscopy images show that hygroscopic CaCl 2 powder spontaneously absorbs water from air to form a solution, which can be used as an electrolyte.…”

Section: Supercapacitor With Self-healable Electrolytesupporting

confidence: 56%

Hygroscopic Chemistry Enables Fire‐Tolerant Supercapacitors with a Self‐Healable “Solute‐in‐Air” Electrolyte

Xia

Zhang

et al. 2022

Advanced Materials

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retardants such as triphenyl phosphate (TPP) [6] and triethyl phosphate (TEP) [7] can prevent thermal runaway, while materials that shutdown at high temperatures such as positive-temperature-coefficient (PTC) electrode [8] and polyethylene-coated separator [9] can stop the further thermal runaway. Extinguishing agents such as 1,1,1,2,2,3,4,5,5,5-decafluoro-3-methoxy-4-(trifluoromethyl)-pentane (DMTP) [10] and heptafluoropropane [11] can put out fires caused by thermal runaway. While using nonflammable materials can prevent fires, [12] high temperatures still irreversibly damage the devices, resulting in a lack of reliability. Ideally, we need a device that is not only non-flammable at high temperatures to achieve high-safety but also maintains/recovers its performance after burning to achieve high-reliability, which we call "fire-tolerant" here. A typical supercapacitor has two electrodes, a separator, and the electrolyte. [13] While the electrode and separator can be replaced with non-flammable or even fire-tolerant materials, [14] there are currently no corresponding electrolytes that are stable at fire temperatures. [15] We propose using a self-healable electrolyte. A typical electrolyte consists of solute and solvent. [16] At high temperatures, though the solvent evaporates, the remained solute could be thermally stable. The electrolyte could be recovered either by refilling with fresh solvent or recapturing the evaporated solvent. For a self-healable electrolyte to recapture evaporated solvents from the environment, the solutes must be able to absorb water from the air (hygroscopic).Here, we report a high-reliability fire-tolerant supercapacitor that can restore itself after burning. The core is the hygroscopic CaCl 2 solute in the air, which spontaneously absorbs water from the air to form a CaCl 2 solution, used as a self-healable "solutein-air" electrolyte. The electrolyte evaporates at high temperatures and regenerates itself by spontaneously recapturing water (solvent) from the air at low temperatures (Scheme 1a), allowing the supercapacitor to revive its function after temporary failure from burning. To ensure the thermal stability of other components, thermally stable electrodes and separators were selected. To allow the CaCl 2 solute to contact air, we punched one hole on each side of a common coin cell case to form a semiopen supercapacitor. With the above changes to a conventional supercapacitor, a fire-tolerant supercapacitor is constructed with a reversible solvent evaporating/condensing High-temperature-induced fire is an extremely serious safety risk in energy storage devices; which can be avoided by replacing their components with nonflammable materials. However; these devices are still destroyed by the high-temperature decomposition; lacking reliability. Here, a fire-tolerant supercapacitor is further demonstrated that recovers after burning with a self-healable "solute-in-air" electrolyte. Using fire-tolerant electrodes and separator with a semiopen device configuration; hygroscopic CaCl 2...

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Section: Supercapacitor With Self-healable Electrolytesupporting

confidence: 56%

Hygroscopic Chemistry Enables Fire‐Tolerant Supercapacitors with a Self‐Healable “Solute‐in‐Air” Electrolyte

Xia

Zhang

et al. 2022

Advanced Materials

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“… Isotherm Chili pepper Varieties EMC (dry base) Net isosteric heat of sorption (kJ . mol −1 ) Reference Desorption Lamuyo 0.050–0.060 0.700–74.200 ( Vega-Gálvez et al., 2007 ) Black peppercorns 0.020–0.700 0.500–73.310 ( Yogendrarajah et al., 2015 ) Sweet peppers 0.050–0.380 -14.000–50.000 ( Sahu and Tiwari, 2007 ) Bursa 0.080–0.450 0.7000–38.000 ( Kaymak-Ertekin and Sultanoglu, 2001 ) Aji 0.070–0.550 145.220–202.270 ( Andrade et al., 2017 ) Bico 0.100–0.750 10.270–47.500 ( Santos et al., 2015 ) M a reko Fana 0.050–0.550 0.003–20.000 Current study Adsorption Lamuyo 0.050–0.800 0.700–36.900 ( Vega-Gálvez et al., 2007 ) Black peppercorns 0.040–0.700 0.800–28.060 ( Yogendrarajah et al., 2015 ) Polyster 0.110–0.860 25.000–45.000 ( Kaleemullah and Kailappan, 2004 ) Bursa 0.060–0.350 0.006–20.000 ( Kaymak-Ertekin and Sultanoglu, 2001 ) M a reko Fana 0.030–0.350 0.030–17.000 Current study …”

Section: Resultsmentioning

confidence: 99%

Effect of maturity on the moisture sorption isotherm of chili pepper (Mareko Fana variety)

Getahun

Gabbiye

Delele

et al. 2020

Heliyon

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The moisture sorption isotherm at three maturity levels of the M a reko Fana chili pepper variety (red, brown and green) has been studied in this paper. The sorption isotherm was determined based on the standard static gravimetric method using a glycerol-water mixture in a relative humidity range of 10–92% at three temperature levels and nonlinear regression analysis was used to select suitable sorption models. The Clasius - Clapeyron equation was implemented to determine the isosteric heat of sorption of the chili pepper using the experimental equilibrium moisture content at different sorption temperature levels. The results showed that the GAB model was well fitted for green chili pepper, while the OSWIN model described well the brown and red chili variant. There was a difference in net isosteric heat between the adsorption and desorption isotherm of chili pepper maturity. For green chili, the maximum value of the net isosteric heat was 18 kJ mol −1 and 20 kJ mol −1 for adsorption and desorption isotherms, respectively and it decreased exponentially as moisture content increased. The desorption heat was higher than the adsorption heat for each maturity of chili pepper which indicated the existence of hysteresis in the sorption process. In comparison to literature data reported for different chili varieties, M a reko Fana has a lower heat of sorption and monolayer moisture content.

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“…As well as there being different methods for collecting isotherm data, various equations ( Supplementary Table 1 , Figure 4 ) have been used to model the data and there are numerous papers in the food science literature where model fits for the different equations have been compared (e.g., Chen, 2003 ; Andrade et al, 2017 ; Zeymer et al, 2019 ; Mallek-Ayadi et al, 2020 ). This serves to emphasize that there should be caution in interpreting sorption isotherms, especially when parameters are given theoretical significance; the results will depend on the software used for analysis but, even more critically, on data quality and quantity (i.e., moisture range covered and number of points and replicates used for isotherm determination).…”

Section: Isotherm Methodology: Determination and Modelingmentioning

confidence: 99%

“…However, these equations are incorrect from a theoretical point of view caused by the absence of Henry's law limit; as the RH tends to zero, the moisture content tends to finite values, whereas it should tend to zero (Labuza and Altunakar, 2020 ). Furthermore, these theoretical equations are often out-performed by empirical or, if temperature is included, semi-empirical equations, including for example, Caurie, Chung-Pfost, Copace, Halsey, Henderson, Oswin, Peleg and Smith, and their respective modifications (Chen, 2003 ; Andrade et al, 2017 ; Zeymer et al, 2019 ; Mallek-Ayadi et al, 2020 ) ( Figure 4 , Supplementary Table 1 , Supplementary Figure 1 ).…”

Section: Isotherm Methodology: Determination and Modelingmentioning

confidence: 99%

Seed Moisture Isotherms, Sorption Models, and Longevity

2022

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Seed moisture sorption isotherms show the equilibrium relationship between water content and equilibrium relative humidity (eRH) when seeds are either losing water from a hydrated state (desorption isotherm) or gaining water from a dry state (adsorption isotherm). They have been used in food science to predict the stability of different products and to optimize drying and/or processing. Isotherms have also been applied to understand the physiological processes occurring in viable seeds and how sorption properties differ in relation to, for example, developmental maturity, degree of desiccation tolerance, or dormancy status. In this review, we describe how sorption isotherms can help us understand how the longevity of viable seeds depends upon how they are dried and the conditions under which they are stored. We describe different ways in which isotherms can be determined, how the data are modeled using various theoretical and non-theoretical equations, and how they can be interpreted in relation to storage stability.

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Determination of the hygroscopic equilibrium and isosteric heat of aji chili pepper

Cited by 6 publications

References 16 publications

Hygroscopic Chemistry Enables Fire‐Tolerant Supercapacitors with a Self‐Healable “Solute‐in‐Air” Electrolyte

Hygroscopic Chemistry Enables Fire‐Tolerant Supercapacitors with a Self‐Healable “Solute‐in‐Air” Electrolyte

Effect of maturity on the moisture sorption isotherm of chili pepper (Mareko Fana variety)

Seed Moisture Isotherms, Sorption Models, and Longevity

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