Imagine nano 2013-2
22
-
Upload
ain-tech -
Category
Technology
-
view
184 -
download
1
description
Antibacterial textiles based on poly-pyrrole nano-coatings
Transcript of Imagine nano 2013-2
ANTIBACTERIAL TEXTILES
BASED ON POLY-PYRROLE
NANO-COATINGSMaría Monteserín, Francisco Martín, Gonzalo G. María Monteserín, Francisco Martín, Gonzalo G.
Fuentes, Rafael J. Rodriguez
MATERIALS2
• indice
OUTLINEOUTLINE
- Introduction
- Previous remarks
- Objectives
- Experimental results
- Conclusions
3
Introduction
Bacteria on fabrics
Stains
Degradation
The proliferation of certain kind of bacteria on
textiles can cause several
undesired effects
Bad Odours
Infections
4
Technical
Sports Clothes
Biomedical
Textiles
For some applications of textiles, it is specially important to avoid these
adverse effects:
Introduction
Bacteria on Fabrics
5
Introduction
Technical approaches to develop antibacterial textiles
Fabric
- New raw materials (expensive, time-consuming)
- Modification of existing textile materials
BULK MODIFICATION SURFACE MODIFICATION
Incorporated
into the fiber
Coating of
the fiber
Fabric
Binded to
the fiber
Chemical bindingLeaching effect
6
Introduction
Antibacterial agents used on Fabrics
SilverQuaternary
ammonium salts
Chitosan Triclosan
N-halamine7
However, many of the commertially available
antibacterial agents used in textiles are either
environmentally toxic, have limited
antibacterial activity or are known to be
potentially cytotoxic.
Introduction
potentially cytotoxic.
ALTERNATIVE TEXTILE
MATERIALS AND/OR COATINGSWITH ANTIBACTERIAL PROPERTIES
8
Development of Antibacterial nano-coatingsfor technical and biomedical textiles based on
Plasma Polymerized Poly-Pyrrole
Objectives
9
• Biocompatible – No dangerous for thehuman being
• Easy to manipulate
• Tested antibacterial activity when isprepared by oxidative chemical synthesis*
WhyWhy
PolyPoly--PyrrolePyrrole??
Previous remarks
*Varesano A, Synthetic Metals. 2009;159:1082-1089.
Inherent conductive polymer (ICP)
Positive charges
Antibacterial activity
10
WhyWhy
PlasmaPlasma
PolymerizationPolymerization??
PE-CVD
Plasma Enhanced Chemical Vapor Deposition
Previous remarks
- Environmentally friendly technique – no solvents are used
- Low temperatures are achieved during the process, so
textile fibres are not damaged
- Easily industrializable process
11
WhatWhat isis
PlasmaPlasma
PolymerizationPolymerization??
Previous remarks
PE-CVD
Plasma Enhanced Chemical Vapor Deposition
RF discharge
Time
Pressure
Discharge power
Monomer flow
Carrier gas
Film structure
&
properties
Pyrrole gas
Poly-Pyrrole
deposition
Textile fabric
12
Conventionally synthetized
poly-pyrrole
Plasma polymerized
Previous remarks
Drawbacks
of plasma
polymerization
Loss of pyrrolePlasma polymerized
polymers
D. Merche et al. Thin solid films 520, 13, 2012, 4219–4236
Structure and properties
are highly dependent
on the deposition
parameters
Loss of pyrrole
functionalization
13
CHALLENGE
Trasfer the antibacterial activity observed in
chemically synthesized Poly-Pyrrole to the
plasma polymerized polymer by
Objectives
plasma polymerized polymer by
minimizing the loss of
funcionalization during plasma
polymerization
14
Deposition of poly-pyrrole coatings
on cotton fabrics
Experimental results
Cotton
15
HOMOGENEOUS
LOW ROUGHNESS
COATINGS
Optimization of the deposition process
Experimental results
Monomer flow rate
Time
Pressure
Gas Mixtures
Discharge power
DopingBroken
PPy
-CΞN
Incr
ea
sin
gp
ow
er
Non-conductive
Poly-pyrrole
No antibacterial
activity
16
DopingPPy
ring
Incr
ea
sin
g
Pyrrole1200 1000 800 600 400 200 00
20000
40000
60000
80000
100000
120000
140000
160000
180000
NKVV
Inte
nsity
(cp
s)
Binding Energy (eV)
27N 27D 28N 28D 29N 29D 30N 30D
survey
O1s
C1s
Si2p
Si2s
I3d
CKLL
OKVV
N1s
Optimization of the deposition process
Experimental results
Iodine Doping
Non-doped poly-pyrrole
NON-CONDUCTIVE
16
20
Induce the oxidation of polypyrrole structure
to obtain positive charges
17
Positive charges
N+
Doped poly-pyrrole
CONDUCTIVE 0
4
8
12
50 W 35 W 20 W
% N
+/N
Measurement of the antibacterial activity
Experimental results
ASTM E 2149-01 procedure for fabrics
- Quantitative method
- Dynamic contact conditions
Escherichia coli PPy Coated fabricEscherichia coli
+
PPy Coated fabric
Bacterium inoculum
In buffer solution
shaken at 190 rpm for 1 h
24 h at 37 °C
count the
surviving colonies
of bacteria
18
Measurement of the antibacterial activity
Experimental results
Good antibacterial
activity0
4
8
12
16
20
% N
+/N
0
10
20
30
40
50
60
70
80
90
50 W 35 W 20 W
% R
ed
uct
ion
of
ba
cte
ria
19
activity
Antibacterial activity against K. pneumoniae
0
50 W 35 W 20 W
Conclusions
CONCLUSIONS
Good antibacterial activity has been observed on cotton
fabrics coated with plasma polymerized poly-pyrrole.
Iodine-doping is necessary to induce the antibacterial behaviour of
poly-pyrrole deposited by plasma polymerization. Doping during
polymerization has been shown a much more effective method to induce
oxidation of poly-pyrrole.
20
ANTIBACTERIAL TEXTILES
BASED ON POLY-PYRROLE
NANO-COATINGSMaría Monteserín, Francisco Martín, Gonzalo G. María Monteserín, Francisco Martín, Gonzalo G.
Fuentes, Rafael J. Rodriguez
MATERIALS22
