Structural, optical, and electrical properties of cellulose/titanate nanosheets composite with enhanced protection against gamma irradiation
Issued Date
2023-01-01
Resource Type
ISSN
02728842
Scopus ID
2-s2.0-85165643582
Journal Title
Ceramics International
Rights Holder(s)
SCOPUS
Bibliographic Citation
Ceramics International (2023)
Suggested Citation
Maluangnont T., Kwamman T., Pulphol P., Pongampai S., Charoonsuk T., Pakawanit P., Seriwattanachai C., Kanjanaboos P., Vittayakorn N. Structural, optical, and electrical properties of cellulose/titanate nanosheets composite with enhanced protection against gamma irradiation. Ceramics International (2023). doi:10.1016/j.ceramint.2023.07.147 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/88193
Title
Structural, optical, and electrical properties of cellulose/titanate nanosheets composite with enhanced protection against gamma irradiation
Other Contributor(s)
Abstract
Two-dimensional (2D) materials have emerged as a promising functional filler in nanocomposites due to their unique anisotropy and resilience to harsh conditions. We report herein the use of Ti0.91O2 nanosheets as a protective component against γ-irradiation to cellulose paper. The titanate nanosheets were prepared via a sequence of solid-state synthesis of lepidocrocite-type Cs0.7Ti1.825O4, proton exchange to H0.7Ti1.825O4·H2O, and exfoliation with tetrabutylammonium hydroxide. The nanosheets were incorporated into the commercial cellulose filter paper by a simple dip coating up to 0.6 mg cm−2, equivalent to 10 wt% TiO2. The nanosheets distribution was demonstrated by energy dispersive X-ray (EDX) mapping, synchrotron radiation X-ray tomographic microscopy (SRXTM), and atomic force microscopy (AFM). It is found that γ-irradiation (up to 50 kGy) destroyed the cellulose Iβ crystallinity of uncoated paper, but this is less pronounced in the cellulose/titanate nanosheets composite. This was also confirmed by the lack of a 235 nm-absorption characteristics of irradiation-induced decomposition product(s) in nanosheets-containing papers, which also exhibit UVA shielding property. The coated samples remained white while the uncoated ones were darkened with γ-irradiation. In addition, the nanosheets-coated papers showed dielectric permittivity, loss tangent, and AC conductivity which were invariant of the γ-dose, unlike those from the uncoated ones. Our work demonstrates the use of lead-free Ti0.91O2 nanosheets as a γ-shielding component to slow down/prevent structural, optical, and electrical properties damages in cellulose paper, which could extend to other nature-derived materials.
