1：Experimental Design and Method Selection:

The study uses a pyrolysis route to synthesize aligned porous Si-O-C ceramics from polysiloxane precursors, with hydrotalcite (LDH) added to achieve aligned macroporosity during crosslinking. The methodology involves crosslinking of polymer mixtures followed by pyrolysis in an inert atmosphere.

2：Sample Selection and Data Sources:

Three polymeric precursor samples (R02, R10, R18) with varying weight ratios of PHMS to TMTVS (R=2, 10, 18) were synthesized. PDMS content was fixed at 75% of PHMS weight, and LDH amount equal to TMTVS weight.

3：List of Experimental Equipment and Materials:

Precursors include polymethylhydrosiloxane (PHMS), vinyl terminated polydimethylsiloxane (PDMS), cyclic tetramethyl-tetravinlycyclotetrasiloxane (TMTVS), hydrotalcite (LDH), and platinum catalyst. Equipment includes FT-IR spectrometer, TGA/DTG analyzer, tubular furnace, XRD, SEM, FE-SEM, BET analyzer, and X-ray computed tomography.

4：Experimental Procedures and Operational Workflow:

Precursors were mixed and stirred with Pt catalyst, cured at 230°C on a hot plate, and pyrolyzed in a tubular furnace at 4°C/min to 1000°C in argon atmosphere with 1h dwell time. Characterization involved FT-IR, TGA, XRD, SEM, FE-SEM, BET, BJH, and X-ray CT.

5：Data Analysis Methods:

Data were analyzed using FT-IR for chemical bonds, TGA for thermal decomposition, XRD for amorphous nature, SEM and FE-SEM for pore morphology, BET and BJH for surface area and pore size distribution, and X-ray CT for pore alignment and size.