Characterization of Dielectric Properties of Nanocellulose from Wood and Algae for Electrical Insulator Applications
Characterization of Dielectric Properties of Nanocellulose from Wood and Algae for Electrical Insulator Applications
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DOI：
10.1021/acs.jpcb.5b00715
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发表时间：
2015-05-07
影响因子：
3.3
通讯作者：
Mihranyan, Albert
中科院分区：
文献类型：
--
作者：
Le Bras, David;Stromme, Maria;Mihranyan, Albert
纤维素是用于充油高功率变压器和电缆的最古老的电绝缘材料之一。然而，关于纳米纤维素用于电绝缘体应用的介电性质的报道很少。本研究的目的是表征来自木材的两种纳米纤维素类型的介电性质，即，纳米原纤化纤维素（NFC）和藻类，即，刚毛藻纤维素，用于电绝缘体应用。的纤维素材料，其特征在于与X-射线衍射，氮气和水分吸附等温线，氦比重瓶，机械测试，和介电光谱在各种相对湿度。与NFC相比，藻类纳米纤维素样品更结晶，并且在低和中等相对湿度下具有较低的水分吸附能力。另一方面，它的多孔性更大，导致强度比NFC低，介电损耗比NFC高。可以得出结论，纳米纤维素的固态性质可能对电绝缘体应用的介电性质产生实质性影响。
Cellulose is one of the oldest electrically insulating materials used in oil-filled high-power transformers and cables. However, reports on the dielectric properties of nanocellulose for electrical insulator applications are scarce. The aim of this study was to characterize the dielectric properties of two nanocellulose types from wood, viz., nanofibrillated cellulose (NFC), and algae, viz., Cladophora cellulose, for electrical insulator applications. The cellulose materials were characterized with X-ray diffraction, nitrogen gas and moisture sorption isotherms, helium pycnometry, mechanical testing, and dielectric spectroscopy at various relative humidities. The algae nanocellulose sample was more crystalline and had a lower moisture sorption capacity at low and moderate relative humidities, compared to NFC. On the other hand, it was much more porous, which resulted in lower strength and higher dielectric loss than for NFC. It is concluded that the solid-state properties of nanocellulose may have a substantial impact on the dielectric properties of electrical insulator applications.