Electrochemical characterization and metal speciation of silver LLDPE
nanocomposite films
Irene Domínguez*a, Antonio Doménech-Carbó*b, Josep P. Cerisueloa, Gracia LópezCarballoa, Pilar Hernández-Muñoza, Rafael Gavaraa
a
Packaging Lab., Instituto de Agroquímica y Tecnología de los Alimentos, IATA-
CSIC, Av. Agustín Escardino 7, 46980 Paterna, Spain
b
Departament de Química Analítica, Universitat de València, Dr. Moliner 50, 46100
Burjassot, València, Spain.
Supporting information
Figure S.1. UV-Vis absorption spectra of the silver solutions used in the preparation of
silver doped LLDPE films: AgCL (blue), AgYL (green) and AgBW (red). Coloured
solutions were diluted with water before spectra recorded -AgYL (1:4) and AgBW
(1:7).
Figure S.2. Oxidative induction time curves of LLPE control sample and silver doped
LLDPE films.
Figure S.3. DSC analysis of LLDPE control sample and silver doped LLDPE films:
AgCL (blue), AgYL (green) and AgBW (red).
Figure S.4. Experimental Nyquist diagrams (black circles) for EIS at OCP of: a)
PECL@Ag (black) and b) PEYL@Ag films immersed into in 0.25 M HAc/NaAc buffer
at pH 4.75. Red lines/circles represent the theoretical impedance spectra obtained from
equivalent circuit fitting to experimental data using the equivalent circuits represented
as inset (a) and the inset in Fig. 7b (b).
Figure S.1.
1.6
1.4
1.2
Absorbance
1.0
0.8
0.6
0.4
0.2
0.0
300
400
500
600
Wavelenght (nm)
700
800
Figure S.2.
1.0
Heat Flow (W/g)
0.8
0.6
0.4
0.2
0.0
-0.2
0
2
4
6
Time (min)
8
10
12
Figure S.3.
Figure S.4.
CPE1
a)
Rs
Rct
b)
Table S.1. Values for the elements of the equivalent circuit in Fig. 8b for EIS spectra of
PEYL@Ag and PEBW@Ag films. Experimental conditions in caption for Figs. 7 and
8.
Element PEYL@Ag PEBW@Ag Element PEYL@Ag
PEBW@Ag
Rs ()
234
181
W (SI)
3,1x10-5
1,0x10-12
R1 ()
1,2x103
5,2x104
C (F)
2,9x10-7
9,0x10-5
R2 ()
526
260
Q1 (SI)
3,4x10-6 (0,42) 7,7x10-6 (0,62)
Q2 (SI)
4,5x10-7 (0,84) 1,6x10-9 (0,95)