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What causes the low viscosity of ether-functionalized ionic liquids? Its dependence on the increase of free volume

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : What causes the low viscosity of ether-functionalized ionic liquids? Its dependence on the increase of free volume
นักวิจัย : Chen, Zhengjian , Xue, Tong , Lee, Jong-Min
คำค้น : -
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2555
อ้างอิง : Chen, Z., Xue, T., & Lee, J.-M. (2012). What causes the low viscosity of ether-functionalized ionic liquids? Its dependence on the increase of free volume. RSC advances, 2(28), 10564-10574. , 2046-2069 , http://hdl.handle.net/10220/10573 , http://dx.doi.org/10.1039/c2ra21772d
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : RSC advances
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

A series of 12 ether-functionalized room temperature ionic liquids (RTILs) and their alkyl counterparts (short of an oxygen atom) were prepared and characterized to investigate the reason for the alkoxy chain effect on decreasing viscosity and how to best apply it. In addition to the ability of the alkoxy chains to decrease viscosity (ηO/η, as low as 0.594) and its activation energy (ΔEη, as low as -4.14 kJ mol−1), they were also found to be able to increase the total free volume (ΔFVO, up to 4.93 mL mol−1), by using density and surface tension. Furthermore, both the obtained ηO/η and ΔEη values for the 12 pairs of RTILs show a strong decreasing dependence on ΔFVO. Accordingly, the reason for the alkoxy chain effect on decreasing viscosity was proposed to be due to the ability of the highly flexible alkoxy chains to increase the total free volume, which offers the convenience of transport for the adjacent molecules. To maximize this effect, the alkoxy groups were supposed to contain a rod-like alkyl tail and a short –CH2– spacer between the ether O atom and the cationic N atom, and be in an environment without hydrogen bond donors. Generally, the ether-functionalized pyrrolidinium and ammonium RTILs possess high conductivity (up to 4.97 mS cm−1 at 25 °C) and wide electrochemical windows (~5.75 V), indicating their significant promise for electrochemical applications.

บรรณานุกรม :
Chen, Zhengjian , Xue, Tong , Lee, Jong-Min . (2555). What causes the low viscosity of ether-functionalized ionic liquids? Its dependence on the increase of free volume.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Chen, Zhengjian , Xue, Tong , Lee, Jong-Min . 2555. "What causes the low viscosity of ether-functionalized ionic liquids? Its dependence on the increase of free volume".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Chen, Zhengjian , Xue, Tong , Lee, Jong-Min . "What causes the low viscosity of ether-functionalized ionic liquids? Its dependence on the increase of free volume."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2555. Print.
Chen, Zhengjian , Xue, Tong , Lee, Jong-Min . What causes the low viscosity of ether-functionalized ionic liquids? Its dependence on the increase of free volume. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2555.