Kim, Jin Hee Rhee, Inkyu Jung, Yong Chae Ha, Sumin Kim, Yoong Ahm 2024-01-20T00:31:15Z 2024-01-20T00:31:15Z 2021-09-05 2017-10 1976-4251 https://pubs.kist.re.kr/handle/201004/122203 We demonstrated the sensitivity of optically active single-walled carbon nanotubes (SWCNTs) with a diameter below 1 nm that were homogeneously dispersed in cement composites under a mechanical load. Deoxyribonucleic acid (DNA) was selected as the dispersing agent to achieve a homogeneous dispersion of SWCNTs in an aqueous solution, and the dispersion state of the SWCNTs were characterized using various optical tools. It was found that the addition of a large amount of DNA prohibited the structural evolution of calcium hydroxide and calcium silicate hydrate. Based on the in-situ Raman and X-ray diffraction studies, it was evident that hydrophilic functional groups within the DNA strongly retarded the hydration reaction. The optimum amount of DNA with respect to the cement was found to be 0.05 wt%. The strong Raman signals coming from the SWCNTs entrapped in the cement composites enabled us to understand their dispersion state within the cement as well as their interfacial interaction. The G and G' bands of the SWCNTs sensitively varied under mechanical compression. Our results indicate that an extremely small amount of SWCNTs can be used as an optical strain sensor if they are homogeneously dispersed within cement composites. English 한국탄소학회 Optical sensitivity of DNA-dispersed single-walled carbon nanotubes within cement composites under mechanical load Article 10.5714/CL.2017.24.090 1 Carbon Letters, v.24, no.1, pp.90 - 96 Carbon Letters 24 1 90 96 N scie scopus kci ART002278251 000418324700012 2-s2.0-85032788551 Chemistry, Multidisciplinary Materials Science, Multidisciplinary Chemistry Materials Science Article RAMAN-SCATTERING MICROSTRUCTURE GRAPHENE SOLUBILIZATION FLUORESCENCE BEHAVIOR MORTAR PASTES SSDNA cement composite single walled carbon nanotube DNA compressive strength Raman