{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T17:00:10Z","timestamp":1790701210807,"version":"4.1.0"},"reference-count":29,"publisher":"American Chemical Society (ACS)","issue":"38","license":[{"start":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T00:00:00Z","timestamp":1789603200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003593","name":"Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100003593","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003401","name":"Funda??o de Amparo ? Pesquisa do Estado de Alagoas","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100003401","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,9,29]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Macaw palm (Acrocomia aculeata) almond oil was evaluated as a potential renewable heat-transfer fluid (HTF) candidate for medium-temperature solar thermal applications through thermophysical and chemical characterization. The oil was extracted using Soxhlet extraction and characterized by gas chromatography with flame ionization detection (GC-FID), Fourier transform infrared spectroscopy (FTIR), ultraviolet\u2013visible spectroscopy (UV\u2013Vis), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The extraction yield was 15.74 \u00b1 2.85% (w\/w), with an acid value of 3.44 \u00b1 0.02 mg KOH\u00b7g\u20131, density of 0.917 \u00b1 0.006 g\u00b7cm\u20133 at 20 \u00b0C, and kinematic viscosity of 29.75 \u00b1 0.76 mm2\u00b7s\u20131 at 40 \u00b0C. Fatty acid composition revealed a predominance of lauric acid (39.36%), followed by oleic (29.99%) and linoleic acids (14.47%), indicating a mixed saturated-unsaturated profile with implications for viscosity behavior and oxidative susceptibility. FTIR and UV\u2013Vis analyses confirmed the triglyceride structure and indicated early oxidation markers associated with unsaturated lipid fractions. Thermal analysis indicated the onset of measurable degradation around 300 \u00b0C, suggesting that continuous thermal-fluid operation should be maintained below this temperature. Compared with other vegetable oils previously investigated for thermal-fluid applications, macaw palm almond oil presents favorable density and viscosity characteristics, although oxidative stability and acid value remain engineering concerns requiring pretreatment or formulation improvements. These findings represent a first-stage screening assessment of macaw palm almond oil as a biobased HTF candidate and support further investigation involving oxidative aging, thermal cycling, corrosion compatibility, and pilot-scale validation.<\/jats:p>","DOI":"10.1021\/acsomega.6c06774","type":"journal-article","created":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T20:02:09Z","timestamp":1789675329000},"page":"57974-57984","source":"Crossref","is-referenced-by-count":0,"title":["Thermophysical\nand Chemical Evaluation of Macaw Palm\nAlmond Oil as a Biobased Heat-Transfer Fluid Candidate for Medium-Temperature\nSolar Thermal Applications"],"prefix":"10.1021","volume":"11","author":[{"given":"Markus AO","family":"Porangaba","sequence":"first","affiliation":[{"name":"Federal University of Alagoas (UFA) , , , ,","place":["Rio Largo, Alagoas, Brazil, 57100-000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thai\u0301s Meira","family":"Menezes","sequence":"additional","affiliation":[{"name":"Federal Rural University of Pernambuco (UFRPE) , , , ,","place":["Cabo de Santo Agostinho, Pernambuco, Brazil, 54518-430"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Isabella Colatino de Lima","family":"Veiga","sequence":"additional","affiliation":[{"name":"Federal University of Alagoas (UFA) , , , ,","place":["Rio Largo, Alagoas, Brazil, 57100-000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Natalia Angelita Albuquerque de","family":"Melo","sequence":"additional","affiliation":[{"name":"Federal University of Alagoas (UFA) , , , ,","place":["Rio Largo, Alagoas, Brazil, 57100-000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0307-8204","authenticated-orcid":true,"given":"Lucas","family":"Meili","sequence":"additional","affiliation":[{"name":"Federal University of Alagoas , , Av. Lourival Melo Mota, s\/n, Campus A.C. Simo\u0303es , Tabuleiro do Martins, , ,","place":["Maceio\u0301, Alagoas, Brazil, 57072-970"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julio Inacio Holanda Tavares","family":"Neto","sequence":"additional","affiliation":[{"name":"Federal University of Alagoas (UFA) , , , ,","place":["Rio Largo, Alagoas, Brazil, 57100-000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amanda Santana","family":"Peiter","sequence":"additional","affiliation":[{"name":"Federal University of Alagoas (UFA) , , , ,","place":["Rio Largo, Alagoas, Brazil, 57100-000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Leonardo Faustino Lacerda de","family":"Souza","sequence":"additional","affiliation":[{"name":"Federal University of Alagoas (UFA) , , , ,","place":["Rio Largo, Alagoas, Brazil, 57100-000"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,17]]},"reference":[{"key":"2026092911104607400_cit1","doi-asserted-by":"publisher","first-page":"114551","DOI":"10.1016\/j.rser.2024.114551","article-title":"The economics of concentrating solar power (CSP): Assessing\ncost competitiveness and deployment potential","volume":"200","author":"Khan","year":"2024","journal-title":"Renewable Sustainable Energy Rev."},{"key":"2026092911104607400_cit2","doi-asserted-by":"publisher","first-page":"383","DOI":"10.1016\/j.apenergy.2015.01.125","article-title":"Heat transfer fluids\nfor concentrating solar power systems \u2013 A review","volume":"146","author":"Vignarooban","year":"2015","journal-title":"Appl. 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Clean Technol."},{"key":"2026092911104607400_cit5","doi-asserted-by":"publisher","first-page":"112844","DOI":"10.1016\/j.rser.2022.112844","article-title":"Latest developments, assessments\nand research trends\nfor next generation of concentrated solar power plants using liquid\nheat transfer fluids","volume":"168","author":"Arias","year":"2022","journal-title":"Renewable Sustainable\nEnergy Rev."},{"key":"2026092911104607400_cit6","doi-asserted-by":"publisher","DOI":"10.1002\/eng2.12576","article-title":"A brief review\nof liquid heat transfer\nmaterials used in concentrated solar power systems and thermal energy\nstorage devices of concentrated solar power systems","volume":"5","author":"Wang","year":"2023","journal-title":"Eng. 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F.\n          \n          Avaliac\u0327a\u0303o\ndas propriedades de o\u0301leos vegetais visando a produc\u0327a\u0303o\nde biodiesel, Master\u2019s thesis; Universidade\nFederal da Parai\u0301ba: Joa\u0303o\nPessoa, 2010."},{"key":"2026092911104607400_cit20","volume-title":"Handbook of Food Science,\nTechnology, and Engineering","author":"Hui","year":"2005"},{"key":"2026092911104607400_cit21","first-page":"91","article-title":"Infrared\nspectrometry, in:","volume-title":"Spectrometric Identification\nof Organic Compounds","author":"Silverstein","year":"1991","edition":"5th"},{"key":"2026092911104607400_cit22","volume-title":"Espectroscopia\nno infravermelho na caracterizac\u0327a\u0303o de compostos orga\u0302nicos","author":"Barbosa","year":"2007"},{"key":"2026092911104607400_cit23","unstructured":"Oliveira, I. 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V.\n          \n          Caracterizac\u0327a\u0303o\ndas propriedades te\u0301rmicas e reolo\u0301gicas em o\u0301leo\nde buriti (Mauritia flexuosa L.) e o\u0301leo de macau\u0301ba (Acrocomia\naculeata), Master\u2019s thesis; Universidade\nFederal do Rio de Janeiro: Rio de\nJaneiro, 2009."}],"container-title":["ACS Omega"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pubs.acs.org\/doi\/pdf\/10.1021\/acsomega.6c06774","content-type":"application\/pdf","content-version":"vor","intended-application":"unspecified"},{"URL":"https:\/\/pubs.acs.org\/acsodf\/article-pdf\/11\/38\/57974\/68546582\/acsomega.6c06774.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/pubs.acs.org\/acsodf\/article-pdf\/11\/38\/57974\/68546582\/acsomega.6c06774.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T16:09:31Z","timestamp":1790698171000},"score":1,"resource":{"primary":{"URL":"https:\/\/pubs.acs.org\/acsodf\/article\/11\/38\/57974\/5432151\/Thermophysical-and-Chemical-Evaluation-of-Macaw"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9,17]]},"references-count":29,"journal-issue":{"issue":"38","published-online":{"date-parts":[[2026,9,17]]},"published-print":{"date-parts":[[2026,9,29]]}},"URL":"https:\/\/doi.org\/10.1021\/acsomega.6c06774","relation":{},"ISSN":["2470-1343"],"issn-type":[{"value":"2470-1343","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,9,17]]}}}