TELKOMNIKA, Vol.14, No.3A, September 2016, pp. 306~312 ISSN: 1693-6930,
accredited A by DIKTI, Decree No: 58DIKTIKep2013 DOI: 10.12928TELKOMNIKA.v14i3A.4438
306
Received March 27, 2016; Revised July 22, 2016; Accepted August 3, 2016
The Field-Induced Effect of Light Transmission for FeOOH-ZnFe2O4 Ferrofluids Control
Anrong Wang
1
, Pengzhi Wei
2
, Yufeng Shao
3
, Xiangfei Nie
4
, Kezhong Liang
5
, Haiyan Huang
6
1,3,4,5,6
Key Laboratory of Signal and Information Processing, Chongqing Three Gorges University, Wanzhou District, Chongqing, 404100, P. R. China
2
College of Science, Harbin Engineering University, Nangang District, Harbin, 150006, P. R. China Corresponding author, e-mail: wang_an_rong163.com
Abstract
The paper is supposed to find the change of the light transmission rate with the change of time of the same volume fraction of ZnFe
2
O
4
ferrofluids, FeOOH ferrofluids and FeOOH-ZnFe
2
O
4
binary ferrofluids, applied in different magnetic field, in parallel to the light direction. The field-induced effects of
light transmission for the three ferrofluids are compared, so as to explore the reason from the microstructure change of the ferrofluids.
Keywords: Ferrofluids, magnetic field, light transmission, field-induced effect Copyright © 2016 Universitas Ahmad Dahlan. All rights reserved.
1. Introduction
Ferrofluids refer to the colloidal suspensions dispersed of the strong magnetic nanoparticles in certain carried liquid. Applied in the magnetic field, magnetic particles form a
chain, orderly arrange along the direction of the magnetic field, creating optical anisotropy. Researches have been carried out on light transmission change and resilience of magnetic
nanoparticles under the effect of the magnetic field [1-3]. Based on that [4], the paper is to make a comparison of the field-induced effect of light transmission for weak magnetic ZnFe
2
O
4
ferrofluids, FeOOH ferrofluids and FeOOH-ZnFe
2
O
4
binary ferrofluids, as well as to present the rule and mechanism of the field-deduced light transmission.
2. Materials and Methods 2.1. The Preparation of Samples
The ZnFe
2
O
4
and α-FeOOH nanoparticles are produced by chemical co-precipitation
technology with FeCl
3
, ZnCl
2
, NaOH, HCl, and HNO
3
. Then Q = 0.04,
v
=0.4 FeOOH of ionic ferrofluid and Q = 0.04,
v
=0.4 ionic ferrofluid are synthesized, in the end, FeOOH mixed with magnetic liquid ZnFe
2
O
4
as FeOOH-ZnFe
2
O
4
dual magnetic liquid. The FeOOH-ZnFe
2
O
4
binary ferrofluids are obtained by mixing both the ferrofluids.
The samples are ZnFe
2
O
4
ferrofluids, FeOOH ferrofluids and FeOOH-ZnFe
2
O
4
binary ferrofluids, in the flat glass case, made into 15mm×15mm×0.53mm film-like light transmission
samples.
2.2. Experimental Apparatus Figure of Field-Deduced Light Transmission
As shown in Figure 1, a laser beam L produced by He-Ne laser irradiate spectroscope b, divided into two beams of light L
1
and L
2
. Beams L
1
go through the magnetic field sample with e
1
magnetic liquids in, then pass the adjustable polarizer c
1
, and expose to the silicon photocell f
1
. Beam L
2
directly go through the magnetic liquid e
2
sample for reference, then pass the adjustable polarizer C
2
, and expose to the silicon photocell f
2
. Silicon photocell f
1
and f
2
convert the light signal strength of L
1
and L
2
, respectively, for the current intensity, which are input and analyzed by the computer, to get the intensity of laser beams L
1
and L
2
. The values of intensity of the I
1
, I
2
, are marked by silicon photocell electrical signal mV for intensity value. To
ISSN: 1693-6930
TELKOMNIKA Vol. 14, No. 3A, September 2016 : 306 – 312
307 measure light transmission, one need to adjust adjustable polarizer light L
1
and L
2
until equal light intensity values is reached. The
＝
beam intensity ratio η I
1
I
2
is defined as light transmittance, namely relative transmittance of light. Without magnetic field, the relative light
transmittance is 1, with magnetic field, the relative light transmittance can tell the influence of field-deduced light transmission for the ferrofluids. At room temperature, the effect of field-
deduced light transmission for samples ZnFe
2
O
4
ferrofluids, FeOOH ferrofluids and FeOOH- ZnFe
2
O
4
binary ferrofluids are measured, the corresponding mechanism are analyzed theoretically.
Figure 1. The sketch map of experimental device
3. Results 3.1. The TEM and VSM Measure of ZnFe
