000132788 001__ 132788
000132788 005__ 20240322114950.0
000132788 0247_ $$2doi$$a10.1016/j.micromeso.2023.112940
000132788 0248_ $$2sideral$$a137715
000132788 037__ $$aART-2024-137715
000132788 041__ $$aeng
000132788 100__ $$aMelián-Cabrera, Ignacio
000132788 245__ $$aOn the surface area per volumetric loading: Its pronounced improvement in densely-packed SWCNT by double-function purification
000132788 260__ $$c2024
000132788 5203_ $$aVolumetric loading is often a critical parameter in process design rather than weight. In this work, we have assessed the volumetric textural parameters of purified single-walled carbon nanotube materials (SWCNT). Purification is a necessary step in the SWCNT manufacturing process as they contain a metal residue inherent to their synthesis. Nitric acid treatment was applied for both metal removal and carbon structural/textural modification. Results show that the volumetric BET area is enhanced in ca. 500% with respect to the non-purified SWCNT (ca. 160% per mass), where both volumetric microporosity and external surfaces are enhanced. For such optimal material, the SWCNT structure remains well-defined though changes are observed (densification, more interstitial space, cutting of the tubes and amorphous carbon being formed). Three intrinsic factors contribute to the volumetric BET's enhancement: the bulk density and the mass-based surface parameters; microporous and external surfaces. The bulk density is enhanced due to a structural densification, thus more carbon is available per volume despite heavier metals (Ni, Y) being removed. One indirect factor, the MOx-removal effect, affects both intrinsic surface parameters. After studying this effect in depth, it was found that the microporosity is truly and largely enhanced due to newly-formed interstitial space. The external surface area is slightly improved but to a much lesser extent than microporosity. Overall, the factors dominating the volumetric BET for our system and applied experimental conditions are the bulk density, microporosity and MOx-removal effect. Concerning the conventional mass-based BET, microporosity and MOx-removal effect are the dominating factors. The study also reveals that mesoporosity control in these materials is possible, in comparison to previous studies.
000132788 536__ $$9info:eu-repo/grantAgreement/ES/DGA/E13-20R$$9info:eu-repo/grantAgreement/EC/H2020/823717/EU/Enabling Science and Technology through European Electron Microscopy/ESTEEM3$$9This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 823717-ESTEEM3$$9info:eu-repo/grantAgreement/ES/MICINN/RYC-2018-024561-I
000132788 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000132788 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000132788 700__ $$aMercadal, Juan J.
000132788 700__ $$0(orcid)0000-0002-5229-2717$$aMayoral, Alvaro
000132788 700__ $$aFierro, José Luis G.
000132788 773__ $$g366 (2024), 112940 [13 pp.]$$pMicroporous mesoporous mater.$$tMICROPOROUS AND MESOPOROUS MATERIALS$$x1387-1811
000132788 8564_ $$s9739643$$uhttps://zaguan.unizar.es/record/132788/files/texto_completo.pdf$$yVersión publicada
000132788 8564_ $$s2730546$$uhttps://zaguan.unizar.es/record/132788/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000132788 909CO $$ooai:zaguan.unizar.es:132788$$particulos$$pdriver
000132788 951__ $$a2024-03-22-11:47:24
000132788 980__ $$aARTICLE