Format

Send to

Choose Destination
See comment in PubMed Commons below
Nanomaterials (Basel). 2017 Aug 12;7(8). pii: E220. doi: 10.3390/nano7080220.

Preparation of Magnetic Nanoparticles via a Chemically Induced Transition: Role of Treating Solution's Temperature.

Author information

1
School of Physical Science and Technology, Southwest University, Chongqing 400715, China. zhangting07@email.swu.edu.cn.
2
School of Physical Science and Technology, Southwest University, Chongqing 400715, China. 15552267851@163.com.
3
School of Physical Science and Technology, Southwest University, Chongqing 400715, China. hezhenho@swu.edu.cn.
4
School of Physical Science and Technology, Southwest University, Chongqing 400715, China. linyq@swu.edu.cn.
5
School of Physical Science and Technology, Southwest University, Chongqing 400715, China. liuzm@swu.edu.cn.
6
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China. lidecai@tsinghua.edu.cn.
7
School of Physical Science and Technology, Southwest University, Chongqing 400715, China. aizhong@swu.edu.cn.
8
School of Physical Science and Technology, Southwest University, Chongqing 400715, China. qxy2001@swu.edu.cn.

Abstract

Using FeOOH/Mg(OH)₂ as precursor and FeCl₂ as the treating solution, we prepared γ-Fe₂O₃ based nanoparticles. The FeCl₂ treating solution catalyzes the chemical reactions, dismutation and oxygenation, leading to the formation of products FeCl₃ and Fe₂O₃, respectively. The treating solution (FeCl₂) accelerates dehydration of the FeOOH compound in the precursor and transforms it into the initial seed crystallite γ-Fe₂O₃. Fe₂O₃ grows epitaxially on the initial seed crystallite γ-Fe₂O₃. The epitaxial layer has a magnetically silent surface, which does not have any magnetization contribution toward the breaking of crystal symmetry. FeCl₃ would be absorbed to form the FeCl₃·6H₂O surface layer outside the particles to form γ-Fe₂O₃/FeCl₃·6H₂O nanoparticles. When the treating solution's temperature is below 70 °C, the dehydration reaction of FeOOH is incomplete and the as-prepared samples are a mixture of both FeOOH and γ-Fe₂O₃/FeCl₃·6H₂O nanoparticles. As the treating solution's temperature increases from 70 to 90 °C, the contents of both FeCl₃·6H₂O and the epitaxial Fe₂O₃ increased in totality.

KEYWORDS:

FeCl2 solution; magnetization; temperature; γ-Fe2O3 nanoparticle

PMID:
28805690
DOI:
10.3390/nano7080220
Free full text

Conflict of interest statement

The authors declare that they have no conflicts of interest.

PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Multidisciplinary Digital Publishing Institute (MDPI)
    Loading ...
    Support Center