Dtg 60h

Thermal stability of the resulting polymer system was studied by differential thermal analysis (DTA). The studies were carried out on the differential thermal analyzer DTG-60H (Shimadzu, Kyoto, Japan) with a heating rate of 2.5 deg min⁻¹ in an air atmosphere.

The FTIR spectra of the microcapsules, LO, polyurethane resin, and the extracted core were recorded by using FTIR spectrometer (Frontier, Perkin Elmer, Shanghai, China) in attenuated total reflectance (ATR) mode with the range of 4000 to 650 cm⁻¹. The core material was separated from broken microcapsules by centrifugation with EtOAc.
The TG curves of microcapsules, LO and polyurethane resin were recorded by using thermogravimetric analyzer (DTG-60(H), SHIMADZU, Kyoto, Japan) in N₂ environment. The sample mass was approximately 5 mg and the test temperature range was 40 to 600 °C with a heating rate of 10 °C/min.
The morphology of microcapsules was observed by a scanning electron microscope (SEM, SU8020, Hitachi). Microcapsules were spread on conductive tape and sputtered with gold. To observe the internal structure, some of the microcapsules were intentionally broken.
The size distribution of microcapsules was measured by a Mastersizer particle size analyzer (Mastersizer 2000, Malvern).

Thermal stability was measured using a thermogravimetric analyser (Shimadzu DTG 60H, Kyoto, Japan). Samples weighing 10 mg were placed in an alumina crucible and evaluated by increasing the temperature constantly from 30 to 950 °C. All measurements were made under the flow of the dynamic nitrogen gas carrier with a flow rate of 20 mL/min. The loss of weight was obtained from the TGA curve of a plot of weight loss (%) versus temperature (°C).

X-ray diffraction experiments (XRD-6000, Shimadzu, Kyoto, Japan) were performed using CuK radiation (λ = 0.15406 nm), operated at 40 kV and 30 mA, goniometer speed of 2°/min, angular step of 0.02, and a counting time of 0.6 s. The chemical analysis was determined by X-ray fluorescence spectrometry (EDX 720-Shimadzu, Kyoto, Japan). Thermogravimetry (TG) and differential thermal analysis (DTA) were performed under an air atmosphere, with a heating rate of 12.5 °C/min (DTG-60H-Shimadzu, Kyoto, Japan) in a platinum crucible from room temperature to 1000 °C. Fourier-transform infrared spectroscopy (FTIR) was recorded in the spectral range from 4000 cm⁻¹ to 400 cm⁻¹, 32 scans with a resolution of 4 cm⁻¹ by attenuated total reflectance (ATR) accessory in diffuse reflectance mode at room temperature (Perkin Elmer, Spectrum 400—Waltham, MA, USA). The surface area quantification was carried out using the Brunauer–Emmett–Teller (BET) method utilizing N₂ adsorption (Nova 1200e Quantachrome Autosorb iQ, Anton Paar, Graz, Austria) [54 (link),55 (link)]. Zeta potential was measured using a Zetasizer Nano Zs (Malvern Instruments, Malvern, England) for isoelectric titration through pH titration. The pH of the solutions was adjusted with 0.100 mol·L⁻¹ NH₄OH or 0.500 mol·L⁻¹ HNO₃.

UV-vis spectral measurements were carried out with an Agilent HP8453 diode array spectrometer. The crystals of Au₅₂Cu₇₂ nanoalloys were re-dissolved in dichloromethane (CH₂Cl₂) for spectral measurements. TGA was carried out on a thermogravimetric analyzer (DTG-60H, Shimadzu Instruments, Inc.) with 4.613 mg of particles in a SiO₂ pan at a heating rate of 10 °C min⁻¹ in an Ar atmosphere. Two or three crystals of Au₅₂Cu₇₂ were picked and dissolved 0.5 mL fresh aqua regia. After ultrasonic dissolution for 3 h, the 5 ml ultrapure water was added into above solution, which can be used to test with ICP-MS. Electrospray ionization (ESI) mass spectra were acquired using a Bruker Q-TOF mass spectrometer equipped with ESI source. The sample was dissolved in methylbenzene (~1 mg ∙ ml⁻¹) and then mixed with a dry methanol solution of CsOAc (30 mM) by a 3:1 vol ratio. The sample was infused at 180 μL ∙ h⁻¹ directly. The source temperature was kept at 50 °C with the spray voltage keeping at 4 kV.