Sta 449c thermal analyzer

UV-vis absorption spectra were obtained on a UV 3600 spectrophotometer (Shimazu, Japan).Fourier transform infrared (FTIR) spectra were collected on a Nicolet 6700 FTIR spectrometer (Nicolet, USA).X-ray diffraction (XRD) measurement was performed on a XRD-6000 diffractometer (Shimadzu, Japan), using Cu Kα radiation (λ = 1.5418 Å) with a scan rate 2 deg/min. Scanning electron microscopy (SEM) images were obtained on a Hitachi S-4800 field-emission scanning electron microscope (Hitachi, Japan).Transmission electron microscopy (TEM) images were collected with a JEM-2100 high-resolution transmission electron microscope (JEOL, Japan). The molar ratio of Mg²⁺/Al³⁺ in Mg-Al-LDH was determined by an optima 5300DV inductively coupled plasma atomic emission spectroscopy (ICP-AES, Perkin Elmer, USA). Thermogravimetry- differential scanning calorimetry (TG-DSC) analysis was performed on a STA 449C thermal analyzer (Netzsch, Germany) under the air flow with a heating rate of 10 K/min. The N₂ adsorption-desorption experiment was carried out by Micromeritics ASAP 2010 (Micromeritics, USA) at 77 K. Specific surface area of Mg-Al-LDH nanoflowers was calculated according to the Brunnauer-Emmett-Teller (BET) method.

β-CD, PS, β-CDCHOM, and PSCHOM powders (5–10 mg) were placed in an alumina crucible, respectively. The comprehensive thermal analysis was carried out by Netzsch STA449 C thermal analyzer (Netzsch Ltd., Serb, Germany). The heating temperature was from 30 °C to 425 °C, with the heating rate being 10°C/min and the N₂ flow rate maintained at 35 mL/min.