文章信息/Info

Title:

Preparation of Co3Fe7/ Carbon Nanofibers Aerogel with High Absorption Properties Derived from Bacterial Cellulose

文章編號:

1674-3962(2022)07-0563-10

作者:

張子強; 劉博文; 方艷; 劉慶雷

（上海交通大學 金屬基復合材料國家重點實驗室，上海 200240）

Author(s):

ZHANG Ziqiang; LIU Bowen; FANG Yan; LIU Qinglei

(State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China)

關鍵詞:

細菌纖維素; 三維互聯網狀結構; 鈷鐵碳納米纖維氣凝膠; 吸波性能

Keywords:

bacterial cellulose;  three-dimensional mesh interconnection structure;  Co3Fe7 carbon nanofibers aerogel;  microwave absorption performance

分類號:

TB34

DOI:

10.7502/j.issn.1674-3962.202008020

文獻標志碼:

A

摘要:

隨著電磁污染的日益嚴重，“薄、寬、輕、強”的新型復合微波吸收材料受到了人們的廣泛關注。然而，新型復合微波吸收材料的制備工藝相對復雜、機械加工性能較差、電磁性能難以調控，阻礙了其發展和應用。以來源豐富、具有三維互聯網狀結構的可再生資源——細菌纖維素為碳源，利用其表面具有的大量羥基吸附鈷鐵離子，再通過一步碳化還原法制備了鈷鐵碳納米纖維 (Co3Fe7/CNF)氣凝膠。研究表明，Co3Fe7/CNF氣凝膠呈三維互聯網狀結構，具有高孔隙、超低密度和高微波吸收性能。當碳化溫度為900 ℃時，Co3Fe7/CNF氣凝膠與石蠟混合物在低負載（質量分數約為3%）、薄厚度（3.5 mm）下的反射損耗為-47.5 dB，表明細菌纖維素生物質材料在滿足“薄、寬、輕、強”為導向的微波吸收材料方面顯示出巨大的潛力。

Abstract:

With the increasingly serious electromagnetic pollution, “thin, wide, light and strong” new composite microwave absorbing materials have attracted extensive attention. However, the development and application of new composite microwave absorbing materials are hindered by comparatively complex fabrication process, weak machinability and difficulty in regulation of electromagnetic properties. Here, as a rich renewable resource with a three-dimensional mesh interconnection structure, bacterial cellulose (BC), whose surface is rich in hydroxyl groups for absorbing cobalt and iron ions, is used as a carbon source to prepare Co3Fe7 carbon nanofibers (Co3Fe7/CNF) aerogel by one-step carbon reduction method. The research shows that Co3Fe7/CNF aerogel has three-dimensional mesh interconnection structure, high porosity, ultra-low density and high microwave absorption performance. When the carbonization temperature is 900 ℃, the reflection loss (RL) of Co3Fe7/CNF aerogel and paraffin mixture with low load (~3wt%) and thin thickness (3.5 mm) is -47.5 dB, indicating that BC biomass materials show great potential in “thin, wide, light and strong” microwave absorbing materials.