1：Experimental Design and Method Selection:

The study involved evaluating optical properties of PEG mixtures, measuring transmittance and fluorescence during phase transitions, and enhancing electric conductivity by dissolving alkaline halide salts. Methods included temperature-controlled experiments using Peltier elements and conductivity measurements.

2：Sample Selection and Data Sources:

Samples were mixtures of PEGs with different molecular weights (e.g., PEG 300, 600, 1000, 2000, 6000) and alkaline halide salts (e.g., NaCl, NaBr, KI, CsI). Data were sourced from laboratory experiments with controlled heating and cooling processes.

3：List of Experimental Equipment and Materials:

Equipment included a miniaturized sample cell with aluminum plate, optical fibers, HeNe laser (633 nm), photodiode, Peltier element, thermocouple, pulsed green laser (527 nm, 10 ns), multichannel spectrometer (Ocean Optics, USB4000), hot plate, magnetic stirrer, conductivity meter (As-One, ECTestr11), glass plates with ITO coating, silicone rubber spacers, and various PEG and salt samples.

4：Experimental Procedures and Operational Workflow:

Procedures involved preparing PEG samples, measuring optical transmittance and fluorescence spectra during heating and cooling, dissolving salts in PEG, measuring solubility and electric conductivity, and conducting self-heating experiments with applied voltages.

5：Data Analysis Methods:

Data were analyzed by plotting transmittance vs. temperature, fluorescence spectra, solubility vs. salt type, conductivity vs. temperature, and current vs. voltage relationships, using statistical and graphical methods.