Differential Thermal Gravimetric Analysis Research Articles

Entropy analysis and grey correlation coefficient cluster analysis of multiple indexes of 5 kinds of condiments

Five condiments, including cinnamon, tangerine peel, clove, licorice, amomum, were selected as the research objects in Guangxi, China. The combustion heat, differential thermal gravimetric analysis, fat, crude fiber, trace element, calcium and ash content data for 5 condiments were determined. According to the combustion heat, differential thermal gravimetric analysis, fat, crude fiber, trace element, calcium and ash content data of condiments, we constructed a systematic multi-index comprehensive evaluation system using entropy analysis, gray pattern recognition and grey correlation coefficient cluster analysis. The multi-index comprehensive evaluation system established by the research provides a new idea for the nutritional evaluation of condiments. This research provides a strong scientific basis for the large-scale development of condiment resources and condiment classification research, basic support for the selection of condiment raw materials.

Synthesis of Organic Phosphor Materials for Display Devices

An organic light emitting diode (OLED) also known as organic electroluminescent diode is a display device like light emitting diode in which an emissive electroluminescent layer is a film of organic compound material that emits light in response to an electric current. This organic layer is situated in between two electrodes; typically at least one of these electrodes is transparent. The organic molecules have conductivity levels ranging from insulators to conductors, and are therefore considered as organic semiconductors. Organic semiconductors were synthesised byone of the method known as the method of Friedlander condensation reaction. Originally, the basic polymer synthesised organic material is group of Diphenylquinoline (DPQ) family which consisted of a single organic layer for OLED. The family members of DPQ were synthesised by bonding chlorine- methyl, bromine, methyl, methoxy, P- hydroxyl, P-Acetyl-biphenyl and P- Acetyl bi-chlorine to the original structure of DPQ at various positions. All the synthesised polymers show crystalline in nature and emits blue colour under UV in various acidic as well as basic solvents like acidic acid, formic acid, chloroform, dichloromethane, tetrahydrofuran etc. The synthesised phosphors were characterised by different techniques to study physical, optical and chemical properties such as Fourier Transform infra-red (FTIR), UV- Visible absorption and photoluminescence spectra, X-Ray diffraction spectra (X-RD), Thermo gravimetric analysis (TGA) and Differential thermal analysis (DTA). All The blue emitting organic phosphors has generated considerable interest owing to their good photoluminescence efficiencies.

Microstructure and Thermal Property of Designed Alginate-Based Polymeric Composite Foam Materials Containing Biomimetic Decellularized Elastic Cartilage Microscaffolds.

This study presents a designed alginate-based polymeric composite foam material containing decellularized elastic cartilage microscaffolds from porcine elastic cartilage by using supercritical fluid and papain treatment for medical scaffold biomaterials. The microstructure and thermal property of the designed alginate-based polymeric composite foam materials with various controlled ratios of alginate molecules and decellularized elastic cartilage microscaffolds were studied and characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and differential thermal gravimetric analysis (TGA/DTG). The microstructure and thermal property of the composite foam materials were affected by the introduction of decellularized elastic cartilage microscaffolds. The designed alginate-based polymeric composite foam materials containing decellularized elastic cartilage microscaffolds were ionically cross-linked with calcium ions by soaking the polymeric composite foam materials in a solution of calcium chloride. Additional calcium ions further improved the microstructure and thermal stability of the resulting ionic cross-linked alginate-based polymeric composite foam materials. Furthermore, the effect of crosslinking functionality on microstructures and thermal properties of the resulting polymeric composite foam materials were studied to build up useful information for 3D substrates for cultivating and growing cartilage cells and/or cartilage tissue engineering.

A multianalytical investigation of the physicochemical properties of white rock art pigments at the Nali and Tene Koro sites, Lembata, East Nusa Tenggara, Indonesia

Nali and Tene Koro are Austronesian rock art sites located in Lembata, East Nusa Tenggara, Indonesia. At both sites, rock art images are painted on the surfaces of outcrop boulders. The rock art depicted at the Nali site is characterized by an anthropomorphic grayish-white image, while rock art at the Tene Koro site depicts a white boat equipped with an up-raked stern, a single mast, and a steering paddle. Since it was reported in 2018, information regarding the physicochemical properties of white pigments used at both sites remains unknown. Herein, a combined analytical strategy was employed to understand the physicochemical properties of the pigment used at the Nali and Tene Koro sites. Several characterization methods, including X-ray fluorescence (XRF), optical microscopy, secondary electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), vibrational spectroscopy (Raman and FTIR), X-ray photoelectron spectroscopy (XPS), and thermal gravimetric-differential thermal analysis (TG-DTA), were applied. The results demonstrated that the white pigment at the Nali site consists of gypsum as a major component and other clay minerals incorporated as minor phases as part of the geological formation of gypsum. On the other hand, the white pigment from the Tene Koro site comprises calcite as the main constituent and minor amounts of sulfur-bearing minerals (gypsum) as calcite weathering products. To the best of our knowledge, this is the first report of a physicochemical study of white pigments used in rock art in Indonesia.

Hydration investigation of negative temperature concrete at early age based on low-field nuclear magnetic resonance

Few control indexes and detection methods have considered the microstructure properties of negative temperature concrete. As such, construction-focused quality control of negative temperature concrete is still a problem that needs to be solved. In this paper, low-field nuclear magnetic resonance (LF-NMR) was used to monitor the in-situ distribution and dynamical variation of liquid water content in cement paste at both thawed (20 °C) and frozen (−15 °C) states. Results showed that LF-NMR could determine the optimal antifreeze dosage and pre-curing time. LF-NMR was also able to evaluate the properties of negative temperature concrete at early stages, and these properties coincided with the results of compressive strength test. Both LF-NMR and differential scanning calorimetry thermal gravimetric analysis (DSC-TGA) revealed that the main positive effect of the antifreeze on negative temperature concrete is the alleviation of frost heave stress, and not the promotion of hydration. Additionally, a theoretical hypothesis was proposed to explain the reason why concrete with low water/binder ratio is more sensitive to freezing damage at the early stages.

Study of the Viscosity and Thermal Characteristics of Polyolefins/Solvent Mixtures: Applications for Plastic Pyrolysis.

Plastic pollution is one of the biggest environmental problems that the world is currently facing. Pyrolysis is a frontier technique aimed at converting plastic waste back into virgin-quality resin. However, the transfer of the waste plastic feed into the pyrolysis reactor must be optimized before the process can be upscaled to a continuous process. In this study, a new solvent that reduces the viscosity of molten plastic was introduced and characterized. The results revealed that the polymers are soluble in the ratio of up to 75 wt % plastic and 25 wt % solvent at 240 °C. The viscosity of pure low-density polyethylene (LDPE), high-density polyethylene (HDPE), and polypropylene (PP) in the solvent was measured in different weight percentages of polymer in solvent (30–80 wt %) and at 160, 180, 200, 220, 240, and 260 °C. The viscosity decreased with the decreasing polymer-weight percentage and with increasing temperature. The viscosity of LDPE/solvent and PPs(isotactic)/solvent is much lower than for HDPE/solvent and PPp(polypropylene impact copolymer)/solvent. Differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA) were applied to characterize the thermal behavior of LDPE, HDPE, and PP in the solvent in three different weight percentages (25, 50, and 75 wt %). The DSC results indicate that in the mixture of PPs/solvent and LDPE/solvent the melting point of PP and LDPE decreases as the amount of solvent increases. Overall, these results indicate that the selected solvent is an effective agent to prepare waste plastics for pyrolysis.

Effect of ZrO2 Nanofiller on the Physical Properties of Epoxy Composites: Mechanical, Thermal and Dielectric

Abstract: In this present work, Zirconia nanoparticles were prepared by precipitation method, Zirconium Oxychloride (ZrOCl2.8H2O) and ammonia (NH3) as starting materials. The synthesized Zirconia nanoparticles were characterized by XRD and the grain size in nanoscale was confirmed. The sheets of neat epoxy resin and epoxy with addition of ZrO2 nanoparticles are primed by solution casting method. The structures of epoxy polymer and hardener were found out using FTIR analysis. The thermal properties were analyzed using Thermo Gravimetric Analysis (TGA) and Differential Thermal Analysis (DTA). Thermo gravimetric analysis has been employed to investigate the thermal characteristics and their mode of thermal degradation. Differential thermal analysis has been used to determine the glass transition temperature of epoxy nanocomposites. The mechanical properties like tensile and flexural studies were analyzed and thus influences of nanofiller loading on these parameters were found to be very low. Keywords: Epoxy, ZrO2 nanoparticles, Nanocomposites, Thermal stability, Dielectric properties, Tensile strength, Flexural strength.

Functionalized nanoclinoptilote as a novel and green catalyst for the synthesis of Mannich bases derived from 4-hydroxy coumarin

In this research, hexamethylene tetraamine propyl silane functionalized nano clinoptilolite (NCP@SiO3PrHMTA) as a novel, green, non-toxic, low cost, heterogeneous, and reusable nanocatalyst was designed, and developed. The structure of the nanocatalyst was fully characterized using various analytical techniques, including; X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS) and thermo gravimetric–differential thermal analysis (TG-DTA). The prepared nanocatalyst has been used as an efficient and recoverable catalyst for the synthesis of aminocoumarin Mannich bases by the three-component reaction of 4-hydroxycoumarin, aniline and aromatic aldehydes. In the presence of this novel nanocatalyst, aminocoumarin Mannich bases were obtained in excellent yields, high purity, and short reaction times under safe and clean conditions.

Optimization and Enhancement of Decorative Glass Organic Coating Properties Containing Ulexite Mineral

Today, glass coatings have a wide range in the industry and have been an important research topic. It is preferred to use glass as a decorative object especially in daily life. In this study, decorative glass coating was tried to be developed with the use of ulexite. The ulexite mineral is a mineral consisting of white round crystalline masses. Test results (visual, hydrophobicity, adhesion tests, etc.) showed that the use of ulexite with additives (potassium dichromate and surfactant) positively affects the coating properties in decorative glass coating production. In the experimental study, Taguchi Method was used as an optimization method and the results were analyzed to improve cost and quality to determine the optimum process parameters. TG-DTA (Thermal Gravimetric Differential Thermal Analysis) and SEM (Scanning Electron Microscope) methods were used to characterize the thermal properties and physical morphological properties of the coatings prepared. It was observed that the additives added in the coatings prepared did not have a negative effect on the structure of the coating. As a result, the additives used improved the properties of glass coatings and the results showed that additive coatings prepared in various industries can be evaluated.

Effect of cationic protein auxiliary on the reactive dyeing properties and structure of aramid fabric

Aramid fabric was plasticized and modified with combination of carrier CWP-N and cationic gelatin protein auxiliary. The dyeing property of the treated aramid fabric dyed with reactive dyes was evaluated. And the modification mechanism of aramid fabric and its reactive dyeing mechanism were analyzed. Then, the structures of the treated aramid fabric were characterized with Fourier transform infrared (FTIR), scanning electron micrograph (SEM), surface friction properties and X-ray diffraction analysis, respectively. In addition, the glass transition temperature and the thermal properties of the treated aramid fabric were investigated by differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA), respectively. The results showed that the dyeing properties of the treated aramid fabric to reactive dyes were improved highly. Compared with the untreated aramid fabric, the dye uptake of the treated aramid fabric increased by more than 2.7 times, the color depth (K/S value) after soaping increased by more than 8 times, and the dye total fixation rate increased by more than 3.2 times. The chemical structure and surface morphology of the treated aramid fabric were changed significantly. And the glass transition temperature of the treated aramid fabric was reduced. The main reason for the significant improvement of reactive dyeing properties of the treated aramid fabric was the change of its structure. However, the crystallinity of the treated aramid fabric was almost unchanged. And the thermal stability of the treated aramid fabric was reduced.

Thermogravimetry and associated characteristics of pearl millet cob and eucalyptus biomass using differential thermal gravimetric analysis for thermochemical gasification

Thermal decomposition behaviour of two different biomasses and their degradation kinetics were investigated by using thermogravimetric (TG) analysis under non-isothermal conditions. Pearl millet cob (PMC), an agro-waste that has not been studied adequately for gasification, and eucalyptus (EU) were pyrolytically degraded at three different heating rates, 10, 15, and 20 °C/min, in inert atmosphere from temperatures ambient to 1000 °C.Differential thermogravimetric analysis (DTG) was carried out to study componential degradation of the biomass components (cellulose, hemicellulose, and lignin). Higher cellulose and hemicellulose in PMC had a quicker pyrolysis rate than EU with higher lignin content. Flynn–Wall–Ozawa (FWO) and Distributed Activation Energy Model (DAEM) methods were used to study the kinetic characteristics of the biomasses. The activation energies obtained for PMC and EU were 75–196 and 172–208 kJ/mol by FWO method. The average values were found as 149.63 and 201.65 kJ/mol. The activation energy obtained using DAEM method for PMC and EU were found as 77–197 and 185–219 kJ/mol, respectively with average values being 150.71 and 205.06 kJ/mol, respectively. The PMC has the higher degradable fraction and a lower activation energy, indicating PMC is more appropriate biomass for producer gas generation as compared to EU.

Effect of functionalized silicon carbide nano‐particles as additive in cross‐linked PVA based composites for vibration damping application

AbstractIn this research study, a comprehensive effort has been made to functionalize silicon carbide particles using the acidic oxidation with nitric acid to obtain homogeneous stabilized distribution of activated SiC particles within a polymer matrix, and develop functionalized silicon carbide (f‐SiC) particle reinforced polyvinyl alcohol (PVA) based cross‐linked composite. After fabrication of functionalized silicon carbide (f‐SiC) particle reinforced polyvinyl alcohol based cross‐linked composite with varying f‐SiC weight percentages of PVA (0%, 1%, 2%, 3%, and 4%) were placed to various investigations. Processed samples are initially examined based by the physical tests (water absorption tests), followed by mechanical test (tensile test) and then micro‐structural tests (scanning electron microscopy). Lastly, thermal tests were also concluded which involved the dynamic mechanical, differential thermal and thermo gravimetric analysis. The cross‐linked polyvinyl alcohol‐based composite with 2 weight % of f‐SiC content is observed to be the superlative of all the compositions under this research study that was confirmed by the mechanical and micro‐structural tests. This composite material shows high storage modulus with visco‐elastic behavior, therefore, the material can be utilized to diminish the transmission of noise, as a shock absorber and vibration isolator.

Synthesis and physico-chemistry properties of a diesel-like fuel produced from waste polypropylene pyrolysis oil

In this work, pyrolysis experiments were carried out in a stainless steel semi-batch reactor to produce a diesel-like fuel from waste polypropylene (PP). Aiming to maximize the liquid oil yield, the optimal reactor operating conditions (e. g. heating rate, batch time, degradation temperature, and N2 flow rate) was obtained by the investigation of the thermal behavior of the waste PP using Differential Scanning Calorimetry (DSC) and Thermal Gravimetric Analysis (TGA). The waste PP pyrolysis oil was successfully purified by adsorption onto activated carbon, resulting in a colorant removal percentage of 49.56% as well as in the removal of the particle matter. The functional groups of purified waste PP pyrolysis oil (PWPO) and the Brazilian commercial S-10 diesel fuel were obtained and compared using Fourier Transform Infrared Spectroscopy (FTIR) and Gas Chromatography Coupled to Mass Spectrometry (GC-MS). According to the experimental results, the proposed thermal pyrolysis process has shown a very high liquid oil yield of about 94 wt%, and fuel heavy and light hydrocarbons were identified in PWPO. It was observed that PWPO has physico-chemistry properties similar to those of commercial S-10 diesel fuel, enhancing the high lower heating value (LHV) of about 43.06 MJ/kg. The work findings pointed out the synthetic diesel-like fuel as a promising alternative for cycle diesel engines, dropping the use of fossil fuels without reducing energy efficiency.

New fluorinated azo/schiff base liquid crystals: synthesis, characterisation, mesomorphic study and DFT calculations

ABSTRACT A homologues series of 12 new asymmetric fluorinated azobenzene-Schiff Bases, 2-((E)-(3-chloro-4-fluorophenyl)diazenyl)-5-(((E)-arylidene) amino) anilines (Aa-l) of three rings consist of different alkyloxy groups varying carbon chain length n = 2 to n = 18 at one end and the other end of the compounds is linked to polar atoms like chlorine and fluorine on an aromatic ring at position 3 and 4 respectively were synthesised. The proposed structures of all new mesogens (Aa-l) were confirmed by FT-IR, 1H-NMR, 13C-NMR, 19F NMR and elemental analysis. The mesomorphic behaviour, optical properties and thermal stability of all new compounds have been investigated by polarised optical microscopy (POM), differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). Characteristic textures of smectic A phase were observed for all new mesogenic compounds. The photo-isomerisation property of azo compounds under UV light was also studied. Further, density functional theory (DFT) calculations were carried out to investigate thermal and geometrical parameters of all newly prepared mesogens. Moreover, the relationship between the calculated and experimentally measured parameters has been correlated to understand the effect of the structural parameters on the mesomorphic behaviour.

Non-isothermal crystallization of LiNaGe4O9 glass

The glass of lithium-sodium tetragermanate LiNaGe4O9 is crystallized on heating under the control of differential scanning calorimetry and thermal gravimetric analysis. The measurements were prepared in the temperature range 300-870 K and showed the relatively weak endothermic DSC anomaly and 40-50 K above the single exothermic peak. The endothermic anomaly observed at Tg testified to softening the glass structure whereas the exothermic peak at TC manifested crystallization of the amorphous phase. Studying of TGA demonstrated smooth nearly linear dependences without any visible anomalies. Varying the heating rate from 1.2 up to 40 K/min resulted in noticeable increase of the characteristic temperatures Tg and TC. Lower limit of the glass transition temperature Tg0 was estimated with the help of the existing model. The mechanism of the LiNaGe4O9 glass crystallization is discussed.

Preclinical efficacy study of a porous biopolymeric scaffold based on gelatin-hyaluronic acid-chondroitin sulfate in a porcine burn injury model: role of critical molecular markers (VEGFA, N-cadherin, COX-2), gamma sterilization efficacy and a comparison of healing potential to Integra™

Development of scaffold from biopolymers can ease the requirements for donor skin autograft and plays an effective role in the treatment of burn wounds. In the current study, a porous foam based, bilayered hydrogel scaffold was developed using gelatin, hyaluronic acid and chondroitin sulfate (G-HA-CS). The fabricated scaffold was characterized physicochemically for pre- and post-sterilization efficacy by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). In-vitro studies proved that the scaffold promoted cellular proliferation. The efficacy of G-HA-CS scaffold was compared with Integra™ at different time points (7, 14, 21 and 42 days), in a swine second degree burn wound model. Remarkable healing potential of the scaffold was evident from the wound contraction rate, reduction of IL-6, TNF-α and C3. The expression of healing markers TGF-β1 and collagen 1 revealed significant skin regeneration with regulated fibroblast activation towards the late phase of healing (p < 0.001 at day 21 and 42 vs. control). Expression of Vascular Endothelial Growth Factor A (VEGFA), vimentin and N-cadherin were found to favor angiogenesis and skin regeneration. Mechanistically, scaffold promoted wound healing by modulation of CD-45, cyclooxygenase-2 and MMP-2. Thus, the promising results with foam based scaffold, comparable to Integra™ in swine burn injury model offer an innovative lead for clinical translation for effective management of burn wound.

Thermoelectric properties of Cu2Se sintered in high-pressure H2 or N2 atmosphere

For practical application in thermoelectric modules, thermoelectric materials need to be manufactured into legs with high-density. However, during the process of hot-pressing or spark plasma sintering, sublimation and instability of the materials especially for Te and Se-based compounds requires to be considered. In this work, Cu2Se were prepared by high-hydrogen/nitrogen–pressure sintering technology. High-pressure atmosphere inhibited the volatilization of Se, enabling formation of single-phase high-density Cu2Se bulk materials. Moreover, characterization results of X-ray diffraction, differential scanning calorimetry and thermal gravimetric analyses show that small amount of hydrogen and nitrogen atoms can be incorporated into the lattice of Cu2Se, lowering the thermal conductivity to 0.7–0.8 Wm−1K−1 compared with 1.1 Wm−1K−1 for the counterpart Cu2Se. A maximal figure of merit value of 0.25 at room-temperature was obtained for Cu2Se via sintering in 18 MPa hydrogen at 400 °C. Our high-pressure sintering approach may open a new route for shaping volatile materials into dense thermoelectric legs.

Quaternary Trimethyl Chitosan Chloride Capped Bismuth Nanoparticles with Positive Surface Charges: Catalytic and Antibacterial Activities

Quaternary trimethyl chitosan-stabilized bismuth nanoparticles (QTMC-BiNPs) with positive surface charges were uniquely synthesized and fully characterized. In the synthesis, Quaternary Trimethyl Chitosan (QTMC), a water-soluble derivative of chitosan (CTS) was prepared using two-step reductive methylation. The new biopolymeric functionalized ligand was further used as capping agent for the synthesis of QTMC-BiNPs which was applied as antibacterial and catalytic agents. The reaction was carried out at room temperature without the use of energy consuming or high-cost instruments. The QTMC and nanocomposites were characterized by proton nuclear magnetic resonance (1H NMR), attenuated total reflection Fourier-transform infrared, UV–visible, X-ray diffraction, X-ray photoelectron spectroscopy and energy dispersive X-ray spectroscopic techniques. The topology and morphology of the composites were examined with scanning electron microscopy and high-resolution transmission electron microscopy. Thermogravimetric and differential thermal gravimetric analysis were also conducted. The degree of quaternization and degree of dimethylation values of 63.33 and 11.75%, respectively obtained for QTMC confirmed that the main product is a quaternary derivative. The average particle size of QTMC-BiNPs was evaluated to be between 30 and 45 nm. The QTMC-BiNPs revealed clear and uniform lattice fringes with an estimated interplanar d-spacing of 0.32 nm confirming the formation of highly crystalline nanocomposites. A further insight into the antibacterial activities of this nanomaterial were carefully examined on Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) using resazurin based microdilution method for Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC). The obtained results revealed that both bacteria pathogens were effectively inhibited/killed by the QTMC-BiNPs at very low concentrations. The MIC of 15.63 and 125 µg/mL were recorded against E. coli and S. aureus, respectively while the MBC of 31.25 and 500.00 µg/mL were estimated against E. coli and S. aureus, respectively. An extensive evaluation of the catalytic capability of the nanocomposites towards the reduction of 4-nitrophenol to 4-aminophenol was also carried out with highly promising result.

Synthesis and Characterization of Bio-Based Amorphous Polyamide From Dimethyl furan-2,5-dicarboxylate

In this research, bio-based polyamide (bio-PA) was synthesized from dimethyl furan-2,5-dicarboxylate and 1,3-cyclohexanedimethanamine by melt polymerization. The properties of bio-PA were analyzed by Fourier transform infrared spectrometer (FTIR), nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and thermal gravimetric analysis (TGA), respectively. The results show that this bio-PA presents high glass transition temperature (Tg) from 150 °C to 180 °C and poor crystallization due to the asymmetric rigid structure of cyclohexane and furan. Its molecular weight is low, ascribing to the large steric hindrance from cyclohexane and furan, and the side reaction of N-methylation and decarboxylation. Besides, the results of solubility reveal that this bio-PA can be dissolved in DMSO, DMF and DMAC.

Structural, microstructural and thermal characterization of layer-structured CaSi2 produced by clean combustion synthesis method

Layer-structured calcium silicide (CaSi2) is prepared using a fast and clean combustion synthesis (CS) method, employing silica as the silicon source. The CS process was characterized by the occurrence of an ignition reaction at 510 °C, leading to the formation of CaO, CaSi2, Ca14Si19, and Ca3SiO5 which is converted into CaSi2 with minor amounts of Si after an acid treatment. The mechanism involved in the CS process is discussed. The structure and microstructure of the CS-CaSi2 is characterized and compared with the commercial CaSi2, and the outcomes are discussed based on the Ca-Si binary phase diagram. In comparison with the latter, the CS-CaSi2 has a considerably greater purity, with loosely stacked structure, providing a surface area of around 43 m2 g−1. The thermal analysis of the CS-CaSi2 is conducted under high purity argon and air flow of 100 mL min−1, comprising differential scanning calorimetry (DSC) and thermal gravimetric (TG) analysis. The analysis conducted under argon provides evidence for the occurrence of the melting event at 1037 °C. Under air, the material is almost stable below 800 °C, while the oxidation is detected at higher temperatures. The oxidation peak of the material is realized from the corresponding DSC thermogram to take place at 1028 °C. The oxidation event is suggested to occur through two stages. At the first stage (T < 1030 °C), the event can be explained by the oxidation of calcium content of CaSi2. The second oxidation stage taking place at higher temperatures can be related to the oxidation of Si, with a lower rate. The Li-storage performances of the commercial CaSi2 and CS-CaSi2 are evaluated.