Unexpected Emergence of Carbon-Centered Radicals from Piezoelectric Effect in Oleic Acid-Capped BaTiO3.
ACS Nano
; 18(13): 9645-9655, 2024 Apr 02.
Article
in En
| MEDLINE
| ID: mdl-38501440
ABSTRACT
The utilization of alkyl radicals (â¢R) for hypoxic tumor therapy has great prospects due to its O2-independence and high reactivity. However, correlational initiators for in vivo activation remain scarce. Here, we report that ultrasound excitation of oleic acid-capped BaTiO3 (OA@BaTiO3) can result in an â¢R cascade and hence a means to conquer hypoxic tumors. Mechanistic studies find that the â¢R signal disappears when OA@BaTiO3 undergoes acid washing post-treatment, which is a common procedure for removing the unwanted byproduct BaCO3. Combined with the infrared spectrum analysis, acid treatment was proven to weaken the peaks at 2840-2970 cm-1 characteristic of -CH2- and terminal -CH3 stretching vibration of OA. There is compelling evidence that high temperature thermal oxidation of OA involves the generation of â¢R. Thus, acid washing is considered to remove the loosely bound yet catalytically active OA. And piezoelectric BaTiO3, a potential electron-hole redox catalyst, can sensitize these OA molecules and disintegrate them to â¢R. This unexpected discovery provides us with a distinctive mentality to seek diverse â¢R initiators for tumor ablation, as well as an additional perspective on the postprocessing of synthetic materials.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
ACS Nano
Year:
2024
Document type:
Article
Country of publication:
United States