| PDMS | polydimethylsiloxane |
| 3D | three-dimensional |
| FPX | Fricke-PVA-xylenol orange |
| PVA | poly(vinyl alcohol) |
| XO | xylenol orange |
| AFM | atomic force microscopy |
| MRI | magnetic resonance imaging |
| TE | echo time |
| TR | repetition time |
| TI | inversion time |
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