Photonic crystals in biology

Poster Session, Tuesday, June 15
Theme A1 - B702
Antibacterial and Anticorrosive Glassy Films Prepared on Surface by Sol-Gel Method
Zerin Yeil 1,2,* , Ömer Kesmez 1,2 , Esin Burunkaya 1,2 , Nadir Kiraz 1,2 , Erturul Arpaç 1,2
1 Akdeniz University, Faculty of Science and Art, Department of Chemistry 07058 Antalya, Turkey
2 NANOen R&D Ltd., Antalya Technopolis, Akdeniz University Campus, 07058Antalya, Turkey
Abstract— Preparation and characterization of glass films consisting of SiO 2 , Li 2 O, Na 2 O, K 2 O or MgO in varying
compositions on stainless steel substrates by sol-gel method. Silver nitrate was also introduced into the sols for obtaining
antibacterial effect. Obtained films had high adherence to the substrates and they were also durable in acidic, basic or NaCl
environments. They also present a powerful antibacterial effect against E. coli.
Stainless steels (SS) are an important of class
alloys and are often used in many fields such as
automotive, construction, nuclear, chemical and
food industries. However, corrosion at atmospheric
conditions is the major problem for some stainless
steels. Additionally, for applications of stainless
steel as kitchenware, medical apparatus and
facilities of food processing, the existing and
breeding of microorganism on the surface of
stainless steel products do not meet health criteria.
Stainless steel is known to be affected by
microbiologically induced corrosion (MIC) attack
[1,2]. Usually, MIC consists of adherence of
bacteria or microorganisms to the surface of a
material and alteration of the composition of the
material [1]. Recently, researchers have focused on
this area, and ways for preventing MIC have been
suggested. Baena and co-workers [3] have
demonstrated that incorporation of Cu and Ag may
add antibacterial property to stainless steel.
Sreekumari et al. [4] has found that Ag is more
effective than Cu and Ni. Zhao et al. [5] has
suggested that surface ion-implantation using N + ,
O + and SiF 3 + can be effective in inhibiting the
bacterial adherence. Nanostructure has also been
shown to be effective against induced corrosion
attack [1].
The aim of this work was to obtain a hard,
sctracth and corrosion resistance, and antibacterial
thin films on SS substrates.
Stainless steel substrates were coated with the
prepared coating solution by spin coating method.
The coated substrates were cured at 200-350 o C for
2-3 h.
Figure 1. Surface photographs of (b) glass film coated
stainless steel (a) uncoated stainless steel after corrosion
test. [1]
stainless steel having glassy coating slightly
corroded at the end of 22 day period (Fig.1b).
a
Uncoated Surface
b
Coated Surface
Figure 2. The bacterial test results for E.coli are shown
in Figure.
In summary homogonous films having 300 ± 20
nm thickness were formed by spin coating.
Obtained films were scratch resistant and also
durable in acidic, basic or NaCl environments. The
films containing 3 % AgNO 3 was found to have a
powerful antibacterial effect against E. coli.
*Corresponding author: zerinyesil@hotmail.com
[1] Lo KH, Shek C H, Lai JKL (2009) Recent
developments in stainless steels. Mat. Sci.
Eng. R-Reports 65: 39-104.
[2] De Damborenea JJ, Cristóbal AB, Arenas MA,
López V, Conde A (2007) Selective dissolution of
austenite in AISI 304 stainless steel by bacterial
activity. Materials Letters 61: 821-823.
[3] Baena M, Marquez MC, Matres V, Botella J,
Ventosa A (2006) Bactericidal activity of copper and
niobium-alloyed austenitic stainless steel. Current
Microbiology: 53, 491-495.
[4] Sreekumari KR, Nandakumar K, Takao K,
Kikuchi Y (2003) Silver containing stainless steel as a
new outlook to abate bacterial adhesion and
microbiologically influenced corrosion. ISIJ
International 43 (1): 1799 2806.
[5] Zhao Q, Liu Y, Wang C, Wang S, Peng N, Jeynes
C (2008) Reduction of bacterial adhesion on ionimplanted
stainless steel surfaces. Med. Engin. Physic
30 (3): 341- 349.
The results of NaCl corrosion tests are shown in
Figure 1. It can be seen that the uncoated stainless
steel was severely corroded in 24 h (Fig.1a), but
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