Fesem 6700f electron microscope

The CCOD–Tra mixture was injected using a single-channel needle (diameter: 29 G), CHI-C–Tra and ODex were mixed for approximately 10 s, and then the hydrogel prepolymer was added to the syringe channel and extruded.
The cylindrical hydrogel was cut into two pieces and dyed with different colors. Then, it was pieced together under certain pressure. After 5 minutes, the self-healing ability of the hydrogel was observed.
The microstructure of CCOD and CCOD-BP was lyophilized, and a layer 2 nm thick was sputtered on the surface of the sample to increase its conductivity. The microstructure of the hydrogels was observed under a JEOL FESEM 6700F electron microscope, and the energy of the primary electron was 3 kV.
Similar to the previous test scheme, the cylindrical hydrogel was prepared with a 30 mm diameter and 4 mm height. In all the experiments, the parallel plate geometry diameter was 25 mm, and the temperature of 25 °C, frequency of 0.1 Hz, and oscillatory stress of 1 Pa were kept constant. The self-healing ability of the hydrogel was tested by the rheological test in continuous step strain measurements at a fixed frequency of 10 rad s⁻¹. Each strain interval was kept as 150 s.

UV-visible absorption spectra were measured using a Lambda 800 UV-vis spectrophotometer. Photoluminescent (PL) spectroscopy was measured with a Shimadzu RF-5301 PC spectrophotometer. Dynamic light scattering (DLS) and zeta potential measurements were performed using a Zetasizer NanoZS (Malvern Instruments). The excitation wavelength was 400 nm. PL quantum yields (PLQYs) of QDs were calculated at room temperature using quinine in 0.5 mol L⁻¹ H₂SO₄ aqueous solution as the reference. Transmission electron microscopy (TEM) was performed using a Hitachi H-800 electron microscope at an acceleration voltage of 200 kV with a CCD camera. High-resolution TEM (HRTEM) imaging was performed by a JEM-2100F electron microscope at 200 kV. A scanning electron microscope (SEM) image was implemented with a JEOL FESEM 6700F electron microscope with primary electron energy of 3 kV. X-ray powder diffraction (XRD) investigation was taken using a Siemens D5005 diffractometer. Inductive coupled plasma emission spectrometry (ICP) was performed with a PerkinElmer Optima 3300DV analyser. Luminous efficacy, CIE (Commission Internationale de L'Eclairage 1931), color temperature, and other properties of devices were taken using HAAS2000. The color of light was identified by the CIE colorimetry system. Any color could be described by the chromaticity (x, y) coordinates on the CIE diagram.