Surface morphology of the crumpled GO or rGO samples was investigated using a field emission scanning electron microscope (SEM) (LEO 1530 VP) operating at 10.0 kV for low-, medium- and high-resolution imaging. Before the SEM imaging, the crumpled graphene structures were coated with a layer of AuPd (~2 nm). Transmission electron microscopy (TEM) was performed using a JEOL 2100F TEM/STEM at an acceleration voltage of 200 kV with GO nanosheets on lacey carbon grids. TCE containing aqueous samples were analyzed using a Shimadzu GC-2010 with a Restek Rxi-624Sil MS column following the US EPA 551.1 method. The interlayer spacing before and after compression were identified by X-ray diffraction spectrometry (XRD) on a Bruker AXS D8 Advance instrument with Cu KR radiation (λ = 1.5418 Å). The change of resistance of rGO-PDMS samples in response to chemical exposure was measured by using a portable standard multimeter (Fluke).
Gc 2010
Manufactured by Restek
The GC-2010 is a gas chromatograph designed for analytical laboratory use. It is capable of separating and detecting a wide range of volatile and semi-volatile compounds. The GC-2010 features advanced electronics and precise temperature control to ensure reliable and reproducible results. Further details on the specific features and capabilities of this product are not available.
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Lab products found in correlation
2100f tem stem, by JEOL (1 mentions)
Rxi 624sil ms column, by Restek (1 mentions)
Axs d8 advance, by Bruker (1 mentions)
Ltq velos esi ion trap mass spectrometer, by Thermo Fisher Scientific (1 mentions)
500 mhz spectrometer, by Bruker (1 mentions)
Rtx 5 column, by Restek (1 mentions)
4 methylvaleric acid, by Merck Group (1 mentions)
4 protocols using gc 2010
1
Characterization of Crumpled Graphene
2
Analytical Characterization of Organic Compounds
3
Volatile Fatty Acid Production Analysis
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Volatile fatty production (VFA) for each of the 28, 48, and 72-hour fermentation periods was measured in the IVF as previously described [15] (link). The sample preparation of IVF for VFA analysis was at a ratio of 4:1 of IVF to 20% metaphosphoric acid spiked to 11 mM with 4-methylvaleric acid (Sigma-Aldrich; Castle Hill, NSW, Australia) as internal standard to achieve a sample concentration of 2.2 mM internal standard. Samples were prepped in 1.5 mL microcentrifuge vials and stored at -20˚C. Sample vials were thawed at 4˚C and centrifuged for 20 min at 13,500 g and 4˚C (Labnet Prism R; Edison, NJ, USA). A 0.5 mL subsamples of clear supernatant was extracted using glass Pasteur pipettes and analysed by GC using a Shimadzu GC-2010 (Kyoto, JPN) equipped with a Restek Stabilwax (30 m × 0.25 mm × 0.25 mm) fused silica column and FID. Initial column temperature was 90˚C and ramped up at 3˚C/min until 155˚C temperature was achieved and was held for 8.3 min. Injector temperature was held at 220˚C and FID at 250˚C. Ultra high purity N2 was used as the carrier gas at 1.5 mL/min and the injection was 1.0 mL.
4
GC-MS Analysis of Garlic Essential Oil
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Bulbs (1.0 kg) of A. sativum were purchased on the public market in the city of Sobral, CE and in the laboratory were crushed and packed in a 5 L flask, together with 1.5 L of water, being then subjected to the hydrodistillation process in Clevenger-type apparatus for a period of 4 h. The oil obtained was dried with anhydrous sodium sulfate (~ 1 g), filtered and kept under refrigeration for further analysis.
The chemical composition of the essential oil was determined by gas chromatography analysis using a mass spectrometry detector (CG-EM), performed on a Shimadzu instrument model GC-2010 (quadrupole), with electron impact at 70 eV , RTX-5MS methyl polysiloxane column (30 mx 0.25 mm x 0.25 μm, Restek), injection mode with 1: 100 flow division, helium carrier gas with 1.00 mL.min-1 flow, injector temperature 250 °C and ion source at 230 °C. Chromatographic oven programming: initial temperature of 70 °C, with heating ramp from 4 °C.min -1 to 180 °C and addition of 10 °C /min to 250 °C at the end of the run (34.5 min) . The identification of the compounds was carried out by analyzing the fragmentation patterns shown in the mass spectra with those present in the database provided by the equipment (NIST version 2.0 of 2012 -243,893 compounds), calculation of the Retention Index (IR) and data from the literature.
The chemical composition of the essential oil was determined by gas chromatography analysis using a mass spectrometry detector (CG-EM), performed on a Shimadzu instrument model GC-2010 (quadrupole), with electron impact at 70 eV , RTX-5MS methyl polysiloxane column (30 mx 0.25 mm x 0.25 μm, Restek), injection mode with 1: 100 flow division, helium carrier gas with 1.00 mL.min-1 flow, injector temperature 250 °C and ion source at 230 °C. Chromatographic oven programming: initial temperature of 70 °C, with heating ramp from 4 °C.min -1 to 180 °C and addition of 10 °C /min to 250 °C at the end of the run (34.5 min) . The identification of the compounds was carried out by analyzing the fragmentation patterns shown in the mass spectra with those present in the database provided by the equipment (NIST version 2.0 of 2012 -243,893 compounds), calculation of the Retention Index (IR) and data from the literature.
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