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Dissertations / Theses on the topic 'Biolubricants'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Wang, Min. "Biolubricants and Biolubrication." Doctoral thesis, KTH, Yt- och korrosionsvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156632.

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The main objective of this thesis work was to gain understanding of the principles of biolubrication, focusing on synergistic effects between biolubricants. To this end surface force and friction measurements were carried out by means of Atomic Force Microscopy, using hydrophilic and hydrophobic model surfaces in salt solutions of high ionic strength (≈ 150 mM) in presence of different biolubricants. There was also a need to gain information on the adsorbed layers formed by the biolubricants. This was achieved by using a range of methods such as Atomic Force Microscopy PeakForce imaging, Quart

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2

Bahari, Adli. "Investigation into tribological performance of vegetable oils as biolubricants at severe contact conditions." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/19524/.

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The concern about the pollution created by the use of mineral oil based lubricants and the depletion stock of petroleum has inspired research on alternative lubricants known as biolubricants. The tribological performance of vegetable oils (palm oil and soybean oil) as biolubricants and their blends with mineral oil and anti-wear additives was evaluated in order to assess their potential use in automotive engines. The tests were performed using a reciprocating ball-on-flat test-rig at severe contact conditions with grey cast iron specimens. The performance was compared with a commercial mineral

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3

Yao, Linxing. "Synthesis of fatty acid derivatives as potential biolubricants and their physical properties and boundary lubrication performances." [Ames, Iowa : Iowa State University], 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3355548.

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4

Silva, Sabrina Spagnolo Pedro da. "Síntese de sebacato de dioctila empregando lipases." Universidade do Estado do Rio de Janeiro, 2012. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=5393.

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A crescente demanda por lubrificantes obtidos a partir de fontes renováveis vem incentivando a pesquisa por alternativas sustentáveis. O objetivo principal deste trabalho foi investigar a síntese de sebacato de dioctila a partir da reação de esterificação entre o ácido sebácico e o 1-octanol empregando biocatalisadores e catalisador químico convencional (ácido sulfúrico). Alguns parâmetros reacionais foram estudados: tipo de lipase comercial imobilizada (Novozym 435, Lipozyme RM IM e Lipozyme TL IM), temperatura, razão molar ácido/álcool, concentração de lipase, métodos de remoção da água do m

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5

Teixeira, Kelly Cristina dos Santos. "Study of composition and stability in emulsions made from vegetable oil lubricants." Universidade Federal do CearÃ, 2008. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=2593.

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AgÃncia Nacional do PetrÃleo<br>EmulsÃes a base de Ãleos lubrificantes vegetais foram preparadas com intuito de fornecer embasamento cientÃfico para futuras formulaÃÃes de fluidos de corte âemulsionÃveisâ. AtravÃs da construÃÃo de diagramas de fases e utilizando o conceito de BHL, fez-se a escolha do melhor sistema emulsionado, levando-se em consideraÃÃo os aspectos principais relacionados Ã concentraÃÃo de surfactante, de fase aquosa e fase oleosa. Foram construÃdos diagramas representativos para o sistema blend S40/T80-Ãgua-biolubrificante empregando os valores de BHL (9, 10, 11 e 12). O sis

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6

Luna, Francisco Murilo Tavares de. "Estudos de AvaliaÃÃo e Melhoramento de Produtos para IndÃstria de PetrÃleo e de Bioderivados." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=8315.

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Neste trabalho foram realizados estudos para avaliaÃÃo e modificaÃÃo de derivados de petrÃleo e de bioderivados. Na primeira parte deste estudo foi avaliada a seletividade de adsorÃÃo de C8 aromÃticos em peneiras moleculares comerciais. A separaÃÃo dos isÃmeros de xilenos Ã um importante processo na indÃstria petroquÃmica. As tÃcnicas de cromatografia em headspace e pulsos cromatogrÃficos foram utilizadas para obtenÃÃo de dados experimentais de equilÃbrio de adsorÃÃo. Esta abordagem pode ser muito Ãtil para a seleÃÃo de adsorventes, bem como para investigar a variaÃÃo na seletividade em relaÃÃ

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7

Essono, Abaga Ange-Godefroy. "Valorisation non alimentaire des huiles de friture usagées en tant que biolubrifiants." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0313.

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Le projet de recherche appliquée portait sur la valorisation des huiles de friture usagées en tant que biolubrifiant pour chaîne de tronçonneuse. Ces huiles collectées dans les différentes enseignes de restauration présentent une teneur élevée en composés polaires, une acidité élevée, une grande variabilité dans leur composition en acides gras, relatives aux différentes marques d'huiles végétales utilisées. Ces mélanges d'huiles végétales (colza, tournesol, arachide, palme, coprah), déjà valorisés dans la filière des biocarburants, présentent des propriétés physico-chimiques intéressantes (ind

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8

García, Colomer Albert. "Diseño, selección y producción de nuevos biolubricantes." Doctoral thesis, Universitat Ramon Llull, 2011. http://hdl.handle.net/10803/48759.

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L'objectiu del projecte és el desenvolupament de nous processos químics per a la modificació dels subproductes obtinguts en la producció del biodiésel, per obtenir ésters de propietats millorades com lubricants. Les tres propietats més importants que ha de tenir un fluid per al seu ús com lubricant són: viscositat, propietats en fred i estabilitat oxidativa. Els biolubricants de 1ª generació mostren una sèrie de limitacions quan són comparats amb els seus equivalents en base petroli. A causa de les condicions d'operació, els lubricants han de suportar altes temperatures (estabilitat química i

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9

Ugye, Rachel Serumun. "Characterization of palm olein (oil) as base oil for biolubricant production." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20321.

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This research work is on the determination of the properties of palm oil as potential base oil for producing bio based lubricants. The samples analysed were obtained from the open markets in the South West, South East and South South zones of Nigeria. Some of the physical and chemical properties such as viscosity, flash point, pour point, cloud point, specific gravity, acid number, noack volatility and aniline point were analysed. The samples were degummed, neutralised and bleached to remove the red colour (carotene) and gummy materials. The bleached samples were tested to determine the above

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10

Safari, Alaleh. "Time dependent flow of biolubricant and suspended particles behavior within total hip replacement." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/405947.

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Total hip replacement (THR) has been one of the most successful surgeries in the 21st century. Ultra-high-molecular-weight-polyethylene (UHMWPE) shows favorable mechanical and tribological properties when used as a bearing surface material in THR. However, produced UHMWPE wear particles challenge increasing the THR lifetimes. Bone loss (osteolysis) initiated by these wear particles is a major cause of total joint arthroplasty failure in both hip and knee prosthesis. In addition to improving the wear resistance of bearing surfaces to reduce wear, wear debris distribution mechanisms within the

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11

Almasi, Sara. "Nouveau catalyseur et système d'agitation vibrant pour l'amélioration de la production de biodiesel et de biolubricant." Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSEP039.

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L'impact environnemental dû à l'utilisation de carburants et de lubrifiants non renouvelables, associé aux préoccupations liées au changement climatique, a accru la demande de sources d'énergie durables. Les produits d'origine biologique, tels que le biodiesel et les biolubrifiants, sont apparus comme des alternatives aux carburants et lubrifiants minéraux en raison de leur disponibilité, de leur caractère renouvelable, de leurs faibles émissions de gaz, de leur non-toxicité et de leur biodégradabilité. Bien que le biodiesel et les biolubrifiants soient généralement produits par la réaction de

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12

Kuzminska, Maryna. "Catalyseurs hétérogènes d’estérification pour l’oléo-chimie." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0015/document.

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Le but de cette thèse est de développer des catalyseurs hétérogènes utilisés dans l’estérification de l’acide oléique en triméthylpropane afn de produire un bio-lubrifiant : le triméthylolpropane trioléate. Quatre groupes de catalyseurs furent étudiés 1) hétéropolyacides (HPA) immobilisés sur de la silice après dépôt d’oxyde de zirconium; une forte immobilisation des HPA sur la silice fut obtenue avec notamment une bonne résistance au phénomène de lixiviation garantissant une bonne stabilité du catalyseur. 2) silice macroporeuse (Si(HIPE)) fonctionnalisée avec trois différentes phases actives

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13

Alves, Roger Pereira. "Síntese e caracterização de biolubrificante derivado do óleo de linhaça." Universidade Federal de Goiás, 2015. http://repositorio.bc.ufg.br/tede/handle/tede/4422.

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Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2015-04-16T14:44:01Z No. of bitstreams: 2 Dissertação - Roger Pereira Alves - 2015.pdf: 1984653 bytes, checksum: acab08cd2cf2271fa365158234c85c93 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)<br>Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2015-04-16T14:52:13Z (GMT) No. of bitstreams: 2 Dissertação - Roger Pereira Alves - 2015.pdf: 1984653 bytes, checksum: acab08cd2cf2271fa365158234c85c93 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)<br>Made

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14

Cavalcanti, Synara Lucien de Lima. "Caracteriza??o do ?leo de carna?ba para uso como biolubrificante." Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15720.

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Made available in DSpace on 2014-12-17T14:58:23Z (GMT). No. of bitstreams: 1 SynaraLLC_DISSERT.pdf: 6169690 bytes, checksum: faa4a0309db3cf8ab6507bf4b090a9cc (MD5) Previous issue date: 2014-02-03<br>Lubricant is responsible for reducing the wear on the friction protect the metal against oxidation, corrosion and dissipates excess heat, making it essential for the balance of a mechanical system, consequently prolonging the useful life of such a system. The origin of lubricating oils is usually mineral being extracted from the petroleum. But the search for a new source of production of lubrican

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15

Fontana, Josilma F?tima. "Extra??o de ferro da cera de carna?ba utilizando sistemas microemulsionados." Universidade Federal do Rio Grande do Norte, 2011. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15816.

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Made available in DSpace on 2014-12-17T15:01:26Z (GMT). No. of bitstreams: 1 JosilmaFF_DISSERT_Parcial.pdf: 436034 bytes, checksum: 128f71801f48233150a514d2629a577b (MD5) Previous issue date: 2011-02-11<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>The constant search for biodegradable materials for applications in several fields shows that carnauba wax can be a viable alternative in the manufacturing of biolubricants. Carnauba wax is the unique among the natural waxes to have a combination of properties of great importance. In previous studies it was verified the

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16

Sanchez, Annie Alexandra Ceron. "Produção de ésteres alquílicos com potencial lubrificante por transesterificação enzimática do óleo de palmiste e álcoois superiores." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/97/97132/tde-07082018-155844/.

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Os biolubrificantes têm incrementado progressivamente a sua importância sobre os lubrificantes derivados do petróleo devido às rigorosas regulamentações governamentais, o esgotamento das reservas de petróleo e especialmente pelo alto impacto e efeito tóxico dos óleos petroquímicos no ambiente. Os ésteres de óleos naturais podem ser usados como biolubrificantes e são obtidos por transesterificação dos triacilgliceróis com álcoois superiores. A transesterificação enzimática de óleos com álcoois metílico e etílico é um processo muito estudado para a produção de biodiesel, porém outros ésteres pod

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17

García, Ortiz Andrea. "Zeolitas y metales soportados como catalizadores para la obtención de productos de química fina a partir de la biomasa." Doctoral thesis, Universitat Politècnica de València, 2019. http://hdl.handle.net/10251/130212.

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[ES] En esta Tesis Doctoral se presenta la obtención de productos de alto valor añadido a partir de moléculas plataforma derivadas de la biomasa tales como HMF, glicerina, ácido levulínico y alcoholes grasos. Se ha llevado a cabo la síntesis de dioles con interés como monómeros para la obtención de polímeros biodegradables mediante acetalización del HMF con glicerina utilizando aluminosilicatos micro y mesoporosos como catalizadores ácidos heterogéneos. Los resultados obtenidos mostraron que la zeolita bidimensional (ITQ-2) y el material mesoporoso estructurado (MCM-41) poseen las característ

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18

Vaca, Medina Guadalupe. "Elaboration des émulsions natives issues des graines oléoprotéagineuses et transformation catalytique de la fraction lipidique en biolubrifiants écolabellisables." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0103/document.

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Les recherches que nous présentons dans ce mémoire s'inscrivent dans le cadre du projet européen IBIOLAB[1] qui vise à la création de biolubrifiants écolabellisables. Tout d'abord, une approche d'ingénierie inverse a été réalisée pour déterminer le rôle des tensioactifs natifs des graines oléoprotéagineuses dans la stabilisation des oléosomes dans l'eau. Ceci a permis par la suite une approche générique avec la mise en œuvre d'un procédé intégré qui permet la libération des lipides sous forme émulsionnée. Une étape optionnelle consiste en l'hydrolyse enzymatique in situ des triglycérides. L'ac

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19

Cheng, Hsiang-Jung, and 鄭翔戎. "Lubrication Properties of Biolubricants from Rice Straw and Coffee Dregs." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/7zqw7g.

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碩士<br>國立虎尾科技大學<br>機械與機電工程研究所<br>100<br>Nowadays, an environmental-safe biolubricant was emphasized due to the environment protection and the rapid depletion of world fossil fuel reserves. Many scientist used refined plant oil of cash crop, for example Sunflower Oil, Canola Oil, Coconut oil etc. If the litter can be refined to lubricant, the economic benefits would be raised. If rice straw and coffee dregs can be used as bio-additive of lubricant, it will be an important source of renewable and sustainable energy. The objective of this study was to assess the lubrication and friction characteri

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20

Madankar, Chandu Shankarrao. "Development of green process for the production of biolubricants from castor oil." Thesis, 2014. http://localhost:8080/xmlui/handle/12345678/6650.

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21

Lakin, Benjamin Alan. "Developing a cationic contrast agent for computed tomographic imaging of articular cartilage and synthetic biolubricants for early diagnosis and treatment of osteoarthritis." Thesis, 2015. https://hdl.handle.net/2144/15185.

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Osteoarthritis (OA) causes debilitating pain for millions of people, yet OA is typically diagnosed late in the disease process after severe damage to the articular cartilage has occurred and few treatment options exist. Furthermore, destructive techniques are required to measure cartilage biochemical and mechanical properties for studying cartilage function and changes during OA. Hence, research and clinical needs exist for non-destructive measures of cartilage properties. Various arthroscopic (e.g., ultrasound probes) and imaging (e.g., MRI or CT) techniques are available for assessing cartil

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22

PATHAK, VARUN. "SOME STUDIES ON SYNTHESIS AND TRIBOLOGICAL PROPERTIES OF BIOLUBRICANT DERIVED FROM CASTOR OIL." Thesis, 2014. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15619.

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The world today is facing severe oil crisis and environmental pollution, thus there is a great urgency of developing and applying bio based products as a substitute to mineral oil based products. Rapid industrialization and automation in the last decade has increased the demand of mineral oil based lubricant that will get exhausted in the years to come. Also in addition to the above fact, the biodegradability of mineral -oil based lubricants is around 25% maximum. About 50% of all lubricants sold worldwide end up in the Environment. Due to extensive use of mineral oil based lubricants, s

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23

CHEN, JIA-QI, and 陳家齊. "The Effect of Nano-Particle CuO in the Full Coffee Biolubricant on the Tribology Properties." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/4ng8kc.

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24

HSU, YU-JOU, and 徐羽柔. "Investigation of the best pre-clinical regulation plan for medical device commercialization - A case study of biolubricant molecules." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/cxtr79.

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碩士<br>國立臺北科技大學<br>化學工程與生物科技系化學工程碩士班<br>107<br>In recent years, artificial intelligence and innovative technology have been continually applied to develop innovative medical devices for the biomedical industry. Accordingly, related regulations and standards have been stipulated. To ensure that innovative medical devices comply with safety- and effectiveness-related regulations for the innovative fields, related testing such as preclinical testing, substantial-equivalence testing, and clinical trials must be performed to yield results within a rational range. From product development to commerci

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