Preparation and characterization of lactate-intercalated Co-Fe layered double hydroxides and exfoliated nanosheet film with low infrared emissivity

被引：45

作者：

Zhu, Yunxia ^{[1
]}

Zhou, Yuming ^{[1
]}

Zhang, Tao ^{[1
]}

He, Man ^{[1
]}

Wang, Yongjuan ^{[1
]}

Yang, Xiaoming ^{[2
]}

Yang, Yong ^{[1
]}

机构：

[1] Southeast Univ, Optoelect Funct Mat & Engn Lab, Sch Chem & Chem Engn, Nanjing 211189, Jiangsu, Peoples R China

[2] Suzhou Sidike New Mat Technol Co Ltd, Suzhou 215400, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2012年 / 263卷

关键词：

Lactate; Co-Fe layered double hydroxides; Delamination; Nanosheet film; MOLECULAR-DYNAMICS SIMULATION; NANOCOMPOSITE; HYDROTALCITE; DELAMINATION; LDH;

D O I：

10.1016/j.apsusc.2012.09.014

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Lactate-intercalated Co-Fe layered double hydroxides (LDHs) were successfully prepared by coprecipitation and hydrothermal method. In this process, divalent metal ions as precursors can be obtained from the reduction reaction of lactic acid and metal powder (cobalt and ferrous). In order to obtain Fe3+, H2O2 (30%) was used to oxidize Fe2+. Meanwhile, the produced lactate was intercalated into the LDHs interlayers to compensate the positively charged layers. The as-synthesized LDHs were studied by element chemical analysis, powder X-ray diffraction (XRD), FT-IR spectroscopy, thermogravitry (TG) and differential scanning calorimetry (DSC), TEM. The results indicated that the basal spacing value of the LDHs was larger than that of lactate-intercalated Mg-Al or Zn-Al LDHs. It proved that the lactate anions were inserted into the gallery in the form of dimers which made it easy to be delaminated in water. The obtained nanosheets were deposited on the substrates to form the film which was characterized by TEM and AFM, and infrared emissivity value (8-14 mu m) was also investigated. The infrared emissivity values of Co-Fe LDHs were lower than that of Zn-Al which took advantage of the special electronic structure in Co and Fe. Besides, the orderly structure and the reduction of the interfacial deficiency of the film made the values further reduced. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.

引用

页码：132 / 138

页数：7