TiO₂ 나노입자와 3-MPTMS로 코팅 처리한 면섬유의 표면 특성과 항균성 및 광분해효과

Surface Characteristics, Antimicrobial and Photodegradation Effect of Cotton Fibers Coated with TiO₂ Nanoparticles and 3-Mercaptopropyltrimethoxysilane(3-MPTMS)

Abstract

In this study, cotton fabrics were coated with $TiO_2$ nanoparticles using 3-mercaptopropyltrimethoxysilane(3-MPTMS), which is highly reactive to cotton fabrics, as a medium, and the characteristics, antimicrobial properties, and photodegradation properties of the fibers were measured. The manufacturing process is as follows. (1) 3-MPTMS was added to isopropanol, and $TiO_2$ colloid was added to the mixture to prepare a solution. (2) Cellulose fibers were immersed in the prepared $3-MPTMS/TiO_2$ solution, stirred for 90 minutes at $45^{\circ}C$ in a constant temperature water bath, and dried thereafter. In order to identify the morphology of the cellulose fibers coated with $TiO_2$ nanoparticles, the surface was observed with a scanning electron microscope(SEM), and SEM-EDS was measured to identify the adhesion of $TiO_2$ nanoparticles. The SEM images showed $TiO_2$ nanoparticle and 3-MPTMS coated layers on the fibers and it was identified that $TiO_2$ nanoparticles were attached to the cellulose fibers. The antimicrobial activity of $3-MPTMS/TiO_2$-treated cotton fabrics was measured using a bacterial reduction method. $3-MPTMS/TiO_2$ cellulose fibers which was irradiated by ultra violet light, showed antimicrobial activity against Escherichia coli(ATCC 43895) and Staphylococcus aureus(ATCCBAA-1707) unlike unirradiated fibers. The cellulose fibers were stained with methylene blue and the photodegradation performance of the stained fabrics was analyzed. The stained fabrics showed high degradation performance with photolytic reactions of $TiO_2$ nanoparticles.

Figure 1. Mechanism scheme of photocatalytic reaction of TiO₂.

Figure 2. TEM image of TiO₂ nanoparticles in TiO₂ colloid solution.

Figure 3. SEM micrograph of (a) na‥ive cotton (b) treated cotton with TiO₂ nanoparticles/3-MPTMS.

Figure 4. 2D(left) and 3D(right) AFM images of (a) naive cotton (b) treated cotton with TiO₂ nanoparticles/3-MPTMS.

Figure 5. SEM-EDS analysis of (a) naive cotton (b) treated cotton with TiO₂ nanoparticles/‥ 3-MPTMS.

Figure 6. Total XPS spectra(left) and Ti region(right) XPS spectra of (a) naive cotton (b) treated cotton with TiO₂ nanoparticles/3-MPTMS.

Figure 7. Reaction scheme between TiO₂ nanoparticles, 3-MPTMS and cotton.

Figure 8. Approach by treatment condition for Ti atomic(%) attachment to cotton fiber : (a) atomic(%) of Ti on cotton fiber surface treated with 3-MPTMS and TiO₂ nanoparticles at different Ti concentration, (b) atomic(%) of Ti on cotton fiber surface treated with 3- MPTMS and TiO₂ nanoparticles at different temperatures, and (c) atomic(%) of Ti on cotton fiber surface treated with 3-MPTMS and TiO₂ nanoparticles at different time.

Figure 9. Atomic(%) of (a) Ti on cotton fiber surface, (b) treated with 3-MPTMS and TiO₂ nanoparticles afterwashing.

Figure 10. K/S spectra of methylene blue solution under UV irradiation at different periods of time in the presence of treated cotton with TiO₂ nanoparticles/3-MPTMS.

Table 1. Characteristics of fabrics used in this study

Table 2. Antimicrobial test results of cotton fabrics treated with 3-MPTMS and 3-MPTMS/TiO₂ nanoparticles