Surface Properties of Ionic Liquids: A Mass Spectrometric View Based on Soft Cluster-Induced Desorption
Surface Properties of Ionic Liquids: A Mass Spectrometric View Based on Soft Cluster-Induced Desorption
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DOI：
10.1021/jasms.2c00038
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发表时间：
2022-06-01
影响因子：
3.2
通讯作者：
Duerr, Michael
中科院分区：
文献类型：
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作者：
Bomhardt, Karolin;Schneider, Pascal;Duerr, Michael
采用中性团簇诱导脱附/电离（DINeC）结合质谱（MS）研究了离子液体（IL）表面的分子组成。基于DINeC-MS的表面灵敏度，根据IL组分的分子结构，在本体IL表面上区分阳离子或阴离子的积累。特别地，具有长烷基链的阳离子在表面上聚集，但这种趋势随着相应阴离子的增大而减小;在较大阴离子和较小阳离子的情况下，甚至可以逆转。对于IL的薄层，阳离子和阴离子之间的比率，如在质谱中检测到的，被发现进一步受到基板表面。
Desorption/ionization induced by neutral clusters (DINeC) in combination with mass spectrometry (MS) was used for the investigation of the molecular composition of the surface of ionic liquids (IL). Based on the surface sensitivity of DINeC-MS, accumulation of either cations or anions was discriminated on the surface of bulk IL depending on the molecular structure of the IL components. In particular, cations with long alkyl chains aggregate on the surface, but this tendency is more reduced the larger the respective anion is; in the case of larger anions and smaller cations, it can be even reversed. For thin layers of IL, the ratio between cations and anions as detected in the mass spectra was found to be further influenced by the substrate surface.