Tga701 thermogravimetric analyzer

Manufactured by Leco

Sourced in United States

The TGA701 Thermogravimetric Analyzer is a laboratory instrument designed to measure the change in the mass of a sample as a function of temperature or time. It provides precise and accurate data on the thermal properties and composition of materials.

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Lab products found in correlation

Nanomer 1 31ps, by Merck Group (1 mentions) Nanomer pgv, by Merck Group (1 mentions)

5 protocols using tga701 thermogravimetric analyzer

Comprehensive Biomass Characterization Protocol

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Unstored and stored (composite of triplicate biological replicates) lyophilized samples were run in triplicate for proximate, elemental CHN, and elemental S analyses as described previously [19 (link)]. Proximate analysis was preformed using a LECO TGA701 Thermogravimetric Analyzer (St. Joseph, MI, USA) following ASTM D 5142-09 [42 ] to determine moisture, volatile, ash, and fixed carbon content. Ultimate analysis was performed using a LECO TruSpec CHN and S add-on module following ASTM D5373-10 [43 , 44 (link)] and ASTM D4239-10 [42 ], respectively, to determine elemental carbon, hydrogen, nitrogen, and sulfur concentrations. Protein content was determined by multiplying the elemental nitrogen content by a conversion factor of 4.78 [45 (link)].

Wendt L.M., Kinchin C., Wahlen B.D., Davis R., Dempster T.A, & Gerken H. (2019). Assessing the stability and techno-economic implications for wet storage of harvested microalgae to manage seasonal variability. Biotechnology for Biofuels, 12, 80.

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Thermal Degradation of Nanoclay Samples

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Nanoclay samples (i.e., unmodified, bentonite (Nanomer PGV) and surface-modified clays: Nanomer I.31PS (0.5–5 wt % aminopropyltriethoxysilane and 15–35 wt % octadecylamine), I.34TCN (25–30 wt % methyl dihydroxylethyl hydrogenated tallow ammonium), and I.44P (35–45 wt % dimethyl dialkyl amine); Supplementary Figure 1a) were purchased from Sigma-Aldrich. Thermal degradation by incineration of such nanoclays was performed at 900 °C using a TGA701 Thermogravimetric Analyzer (LECO). Briefly, samples were heated at 6 °C/min from 25 to 105 °C in nitrogen to measure the moisture content and at 43 °C/min from 105 to 950 °C to determine the high volatile content. Next, samples were evaluated for ash content at 15 °C/min in O atmosphere and between 550 and 900 °C. Resultant ash was collected and used as a model for thermally degraded byproduct formation (referred to hereafter as PGV900, I31900, I34900, and I44900).^{23 (link),24 (link)}

Stueckle T.A., White A., Wagner A., Gupta R.K., Rojanasakul Y, & Dinu C.Z. (2019). Impacts of Organomodified Nanoclays and Their Incinerated Byproducts on Bronchial Cell Monolayer Integrity. Chemical research in toxicology, 32(12), 2445-2458.

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Thermal Degradation of Nanomer Clay Samples

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Samples of PGV, I.31PS, I.34TCN, and I.44P were thermally degraded using a TGA701 Thermogravimetric Analyzer from LECO; degradation was used to mimic the disposal generation in municipal solid waste plants.¹⁹ Differences in mass from unheated samples were monitored as a function of temperature and used to calculate % content change. Moisture content of the samples (around 0.5 g each) was determined in the 25 °C to 105 °C range, in nitrogen, at a rate of 6 °C/min, while high temperature volatile content was determined in the 105 °C to 950 °C range, in nitrogen, at a rate of 43 °C/min. Finally, ash content was determined in the 550 °C to 900 °C range, in oxygen, at a rate of 15 °C/min (Table S1). The resulting individual byproduct was collected to serve as the end of life cycle sample assessment, i.e., thermally degraded Nanomer PGV (PGV900), thermally degraded Nanomer I.31PS (I.31PS900), thermally degraded Nanomer I.34TCN (I.34TCN900), and thermally degraded Nanomer I.44P (I.44P900) respectively.

Wagner A., White A.P., Stueckle T.A., Banerjee D., Sierros K.A., Rojanasakul Y., Agarwal S., Gupta R.K, & Dinu C.Z. (2017). Early assessment and correlations of nanoclay’s toxicity to their physical and chemical properties. ACS applied materials & interfaces, 9(37), 32323-32335.

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Comprehensive Food Composition Analysis

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The moisture and ash contents in the samples were determined by using a TGA701 Thermo-gravimetric Analyzer (Leco Corporation, St. Joseph, MI, USA). The TGA measured weight loss as a function of temperature (105 °C and 650 °C for moisture and ash, respectively) under controlled conditions, and automatically determined the moisture and ash contents in the samples with the selected program. The nitrogen content was determined with an in-house Kjeldahl method based on ISO 20483, ISO 5983-2 and AOAC 2011.11 methods by using a Kjeltec TM8400 analyzer (Foss Analytical Ltd., Höganäs, Sweden). A conversion factor of 6.25 was used to calculate total protein content. The total fat content was determined using the SoxCap TM 2047 in combination with the Soxtec TM 2050 extraction system (Foss Ltd., Hillerød, Denmark) with a preparatory acid hydrolysis step and diethyl ether extraction according to ISO 6492. The total carbohydrate content was calculated with the following formula:

Logrén N., Hiidenhovi J., Kakko T., Välimaa A.L., Mäkinen S., Rintala N., Mattila P., Yang B, & Hopia A. (2022). Effects of Weak Acids on the Microbiological, Nutritional and Sensory Quality of Baltic Herring (Clupea harengus membras). Foods, 11(12), 1717.

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Thermal Degradation of PLA-Cloisite 30B

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Cloisite 30B (CC) was obtained from Southern Clay Products (Gonzales, TX) and, per the manufacturer specifications, organically modified via an ion-exchange reaction with methyl, tallow, bis-2-hydroxyethyl, quaternary ammonium (Scheme S1) at a concentration of 90 meq/100 g clay. Polylactic acid 6752 (PLA; NatureWorks) was melt-mixed with CC loaded at a 5 wt. %, in a Thermo-Haake internal mixer operating at 200 °C and 80 rpm for 5 min. Thin films were then molded at 200 °C using a compression press to form PLA-CC nanocomposites (PLACC), as well as PLA films to be used as controls.
Samples of PLA and PLACC (1 g per sample) were thermally degraded using a TGA701 Thermogravimetric Analyzer (LECO) to mimic their disposal. To determine the moisture content, the samples were heated in nitrogen at a rate of 6 °C/min and in a range of temperatures from 25 °C to 105 °C. To determine the volatile content, the samples were heated from 105 °C to 950 °C, also in nitrogen and at a rate of 43 °C/min. Finally, to determine the ash content, the samples were heated from 550 °C to 900 °C in oxygen, at a rate of 15 °C/min. The resulting ash was collected to serve as a model of the byproducts resulted from incineration i.e., thermally degraded PLA-CC nanocomposite (PLACC900).

Wagner A., White A.P., Tang M.C., Agarwal S., Stueckle T.A., Rojanasakul Y., Gupta R.K, & Dinu C.Z. (2018). Incineration of Nanoclay Composites Leads to Byproducts with Reduced Cellular Reactivity. Scientific Reports, 8, 10709.

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