{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,23]],"date-time":"2026-03-23T04:14:09Z","timestamp":1774239249684,"version":"3.50.1"},"reference-count":26,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2021,6,16]],"date-time":"2021-06-16T00:00:00Z","timestamp":1623801600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["CENTRO 01-0145-FEDER-031884"],"award-info":[{"award-number":["CENTRO 01-0145-FEDER-031884"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100014717","name":"Programa Operacional Regional do Centro","doi-asserted-by":"publisher","award":["CENTRO 01-0145-FEDER-031884"],"award-info":[{"award-number":["CENTRO 01-0145-FEDER-031884"]}],"id":[{"id":"10.13039\/501100014717","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nanomaterials"],"abstract":"<jats:p>The surface properties of two sepiolite samples and one palygorskite sample were compared using inverse gas chromatography (IGC). Samples were previously conditioned at appropriate temperatures for the removal of all zeolitic water. Dispersive (or Lifshitz\u2013van der Waals) component of the surface energy (\u03b3sd), specific interactions (\u2212\u0394Gas) with \u03c0 electron donor bases (1-alkenes), and nanomorphology indices (IM\u03c7T) based on the injections of cycloalkanes and a branched alkane were measured. From IGC data, at 240 \u00b0C, it was found that the palygorskite was clearly distinguished from the sepiolites. The palygorskite possessed a lower \u03b3sd, larger \u2212\u0394Gas with 1-alkenes, and remarkably higher IM\u03c7T. Slight differences could also be observed between the two sepiolite samples with the same origin. The results were rationalized in terms of the structural features of the two studied minerals. The larger channels of the sepiolite allow for a better insertion of the n-alkanes (longer retention times) while excluding the bulkier probes, such as cyclooctane or 2,2,4-trimethylpentane. Accordingly, the corresponding \u03b3sd values were larger and the IM\u03c7T values were lower (higher surface nanoroughness) for the sepiolites. Regarding Lewis acid\u2013base properties, all the sample\u2019s surfaces evidenced a very strong amphoteric character. The present results highlight the potential of the evaluated samples for, e.g., adsorption processes with volatile organic compounds or matrix\u2013filler interactions regarding the production of composite structures with Lewis acid\u2013base matrices.<\/jats:p>","DOI":"10.3390\/nano11061579","type":"journal-article","created":{"date-parts":[[2021,6,16]],"date-time":"2021-06-16T21:58:32Z","timestamp":1623880712000},"page":"1579","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Comparison of Surface Properties of Sepiolite and Palygorskite: Surface Energy and Nanoroughness"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6093-9974","authenticated-orcid":false,"given":"Ricardo","family":"Almeida","sequence":"first","affiliation":[{"name":"CIEPQPF\u2014Chemical Process Engineering and Forest Products Research Centre, Department of Chemical Engineering, University of Coimbra, Rua S\u00edlvio Lima, P\u00f3lo II, PT-3030-790 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4717-6305","authenticated-orcid":false,"given":"Eduardo","family":"Ferraz","sequence":"additional","affiliation":[{"name":"Techn&Art, Polytechnic Institute of Tomar, Quinta do Contador, Estrada da Serra, PT-2300-313 Tomar, Portugal"},{"name":"Geobiotec, Geosciences Department, Campus Universit\u00e1rio de Santiago, University of Aveiro, PT-3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4612-2519","authenticated-orcid":false,"given":"Julio","family":"Santar\u00e9n","sequence":"additional","affiliation":[{"name":"Tolsa, SA, Research & Technology for New Businesses, Ctra. de Madrid a Rivas Jarama, 35, ES-28031 Madrid, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1474-767X","authenticated-orcid":false,"given":"Jos\u00e9 A. F.","family":"Gamelas","sequence":"additional","affiliation":[{"name":"CIEPQPF\u2014Chemical Process Engineering and Forest Products Research Centre, Department of Chemical Engineering, University of Coimbra, Rua S\u00edlvio Lima, P\u00f3lo II, PT-3030-790 Coimbra, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2021,6,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"4573","DOI":"10.1016\/j.jece.2018.07.001","article-title":"Evaluation of two fibrous clay minerals (sepiolite and palygorskite) for CO2 capture","volume":"6","author":"Cecilia","year":"2018","journal-title":"J. Environ. Chem. 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