Use of bio-nano composites as protective coating on natural stone surfaces
Ocak, Yılmaz.

Use of bio-nano composites as protective coating on natural stone surfaces

Ocak, Yılmaz.

Yazar Ek Girişi
Ocak, Yılmaz.

Yayın Bilgileri
[s.l.]: [s.n.], 2013.

Fiziksel Tanımlama
xiv, 121 leaves.: ill.+ 1 computer laser optical disc.

Historical monuments are important heritages to pass cultural values to next generations. Most of the historical monuments were composed of natural stones like marble. SO2 and NOx reacts with marble composed primarily of calcite (CaCO3) is a dry deposition process, gypsum (CaSO4.2H2O) and nitrocalcite (Ca(NO3)2.4H2O) are formed after reaction. The polylactic acid (PLA), 2, 5 and 7 wt.% montmorillonite (MMT) clay added PLA (PLA/MMT2, PLA/MMT5 and PLA/MMT7) bio-nano composites coated and uncoated surfaces were tested for capillary water absorption, water vapor permeability, color alteration, and surface hydrophobicity regarding the nanofiller concentrations before reaction. Results indicated that the bio-nano composite coatings didn’t alter the color of the marble, improved the hydrophobicity and barrier properties of the marbles. The level of layered silicate delamination in the PLA matrix and structural characterizations of PLA nanocomposite coatings were affected the barrier properties of the composites coatings. The X-ray diffraction (XRD), atomic force microscopy (AFM) and scanning transmission electron microscopy (STEM) analysis pointed out that 5% layered silicates were homogenously dispersed in the polymer matrix, exfoliated structures also were observed in some parts of the polymer matrix and nano particles enhanced the nano-composite coating barrier performance. The protection capabilities of the bio-nano composite coatings were studied in laboratory setup (include nearly 8 ppm SO2) and ambient city atmosphere (include nearly 8 ppb SO2 and 64 ppb NO2). The PLAMMT5 bio-nano composite showed significant reduction (~5 times) in the crust formation after 180 days SO2-calcite reaction in laboratory and 9-10 times after 20 months ambient city exposures for outdoor conditions. Bio-nano composites also decreased the kinetic parameters such as rate constant (ks) and effective diffusivity (De) values of the marbles. These results indicated that PLA/MMT bio-nano composite coating seems to be significant promising materials as protective coating agents in reducing the effects of atmospheric pollutants on the marble surfaces.

Konu Başlığı
Monuments -- Conservation and restoration
Nanocomposites (Materials).
Protective coatings.

Yazar Ek Girişi
Sofuoğlu, Aysun.

Tüzel Kişi Ek Girişi
İzmir Institute of Technology. Chemical Engineering.

Tek Biçim Eser Adı
Thesis (Doctoral)--İzmir Institute of Technology: Chemical Engineering.
İzmir Institute of Technology: Chemical Engineering--Thesis (Doctoral).

Elektronik Erişim
Access to Electronic Versiyon.

KütüphaneMateryal TürüDemirbaş NumarasıYer NumarasıDurumu/İade Tarihi
IYTETezT001166TA418.9.N35 O15 2013Tez Koleksiyonu