Photonic crystals in biology

Poster Session, Tuesday, June 15
Theme A1 - B702
Synthesis of Silver Nanoparticles Using Reverse Micelle System
Leyla Budama*, Burçin Acar, Önder Topel, Numan Hoda
Akdeniz University Department of Chemistry, Antalya-Turkey
Abstract-In this study, silver nanoparticles were synthesized using reverse micelles of polystyrene-block-polyacrylic acid as
nanoreactor. Reduction of silver ions to Ag 0 was performed by NaBH 4 . Formation of nanoparticles was confirmed by UV-vis
spectrophotometer and transmission electron microscope.
Nanoparticles have attracted considerable and increasing
attention in the academic research area and industry last
few decades. Because of the novel physical and chemical
properties different from bulk systems, nanoparticles are
used in a variety of material science and engineering such
as optics, electronics, magnetic media and catalysis [1-6].
Among various metal nanoparticles silver nanoparticles
are of special interest due to their unique optical and
electrical properties, as well as for their potential
biomedical applications [7-9]. Many strategies have been
developed for the preparation of silver nanoparticles,
including micro emulsion techniques [10], organic-water
two phase synthesis [11], and aqueous solution reduction
[12–14].
In this present research, silver nanoparticles were
produced using reverse micelle as nanoreactor.
Polystyrene-block-polyacrylic acid (PS-b-PAA)
copolymer used as reverse micelle forming agent in
organic solvent. PS block forms corona and PAA block
forms core of the micelle. Firstly, copolymer was
synthesized by ATRP and characterized NMR and GPC.
After dissolving copolymer in toluene, AgNO 3 was added
to solution as nanoparticle precursor. When AgNO 3 was
reduced to Ag 0 by adding NaBH 4 , colour of the solution
turned to brown-yellow confirming the formation of Ag
nanoparticles. UV-vis spectrum of solution has shown
characteristic absorption peak between 400-450 nm
illustrated in Figure 1. After a drop of solution was cast on
carbon coated cupper grid and solvent was evaporated,
film was analyzed by TEM. Figure 2 shows TEM image of
Ag nanoparticles. The mean diameter of nanoparticles is
12(3) nm. This work was supported by TUBITAK under
the Grant No. TBAG-108T806.
Figure 1. UV-vis spectrum of Ag nanoparticles in PS-b-PAA
micelles.
Figure 2. TEM image of Ag nanoparticles.
*Corresponding Author: leylabudama@akdeniz.edu.tr
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