Guo Mingbo, Wang Yijun, Zhang Lei, Lu Junran, Gong Chang, Zhang Wanning, Fang Yuxi, Zhu Xinyuan, Che Shunai
State Key Laboratory of Synergistic Chem-Bio Synthesis, School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Shanghai Jiao Tong University, Shanghai 200240, China.
SSI New Material (Zhenjiang) Co., Ltd., 7 Songlin Mountain Road, Zhenjiang 212006, China.
Nanomaterials (Basel). 2025 Apr 23;15(9):639. doi: 10.3390/nano15090639.
Zeolite is increasingly recognized for its enhancement of low-frequency acoustic performance in microspeakers. The aging characteristics of zeolite have been regarded as the critical factor for the commercial viability of mobile phones products, but the mechanism remains ambiguous. Here, the low-frequency acoustic performance of hierarchically structured ZSM-5 was investigated through aging with water and acetic acid (AA). It was discovered that water vapor augmented the resonance offset as it enhanced the structure of the zeolite, resulting in a lower water content. The resonance offset of ZSM-5 significantly decreased after the adsorption of AA vapor, as excessive AA was adsorbed through both physical and chemical adsorption, causing partial destruction of supermicropore and mesopores. The performance of ZMS-5 stored with vapor of AA and water mixture did not significantly deteriorate, indicating that water effectively protected the pores of zeolite to prevent excessive adsorption of AA. This was attributed to the fact that water was adsorbed by Brønsted acid sites of ZSM-5 more preferentially than AA, thereby avoiding excessive adsorption of AA.
沸石因其对微型扬声器低频声学性能的增强作用而越来越受到认可。沸石的老化特性被视为手机产品商业可行性的关键因素，但其机制仍不明确。在此，通过用水和乙酸（AA）进行老化处理，研究了分级结构ZSM-5的低频声学性能。研究发现，水蒸气增强了沸石的结构，导致含水量降低，从而增大了共振偏移。ZSM-5在吸附AA蒸气后，共振偏移显著降低，因为过量的AA通过物理和化学吸附被吸附，导致超微孔和中孔部分破坏。用AA和水混合物的蒸气储存的ZMS-5的性能没有显著恶化，这表明水有效地保护了沸石的孔，防止AA过度吸附。这归因于水比AA更优先被ZSM-5的布朗斯台德酸位点吸附，从而避免了AA的过度吸附。
