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Publications (10 of 22) Show all publications
Cao, D., Matsakas, L., Zhang, J., Dong, L., Shi, Y., Zhu, J., . . . Mu, L. (2023). Biolubricant. In: Alok Kumar Patel; Amit Kumar Sharma (Ed.), Sustainable Production Innovations: Bioremediation and Other Biotechnologies (pp. 1-56). John Wiley & Sons
Open this publication in new window or tab >>Biolubricant
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2023 (English)In: Sustainable Production Innovations: Bioremediation and Other Biotechnologies / [ed] Alok Kumar Patel; Amit Kumar Sharma, John Wiley & Sons, 2023, p. 1-56Chapter in book (Other academic)
Place, publisher, year, edition, pages
John Wiley & Sons, 2023
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Biochemical Process Engineering; Machine Elements
Identifiers
urn:nbn:se:ltu:diva-103667 (URN)10.1002/9781119792888.ch1 (DOI)
Note

ISBN for host publication: 9781119791904, 9781119792888

Available from: 2024-01-15 Created: 2024-01-15 Last updated: 2024-01-15Bibliographically approved
Chen, J., Luo, Z., Dong, P., Wang, S., Ji, X., Zhu, J., . . . Mu, L. (2022). Slippage on Porous Spherical Superhydrophobic Surface Revolutionizes Heat Transfer of Non-Newtonian Fluid. Advanced Materials Interfaces, 9(34), Article ID 2201224.
Open this publication in new window or tab >>Slippage on Porous Spherical Superhydrophobic Surface Revolutionizes Heat Transfer of Non-Newtonian Fluid
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2022 (English)In: Advanced Materials Interfaces, ISSN 2196-7350, Vol. 9, no 34, article id 2201224Article in journal (Refereed) Published
Abstract [en]

In this study, a new strategy to achieve high-efficient heat transfer for non-Newtonian fluids with slippage using a stably prepared superhydrophobic coating is presented. A superhydrophobic coating is prepared on the inner surface of a sleeve at specific shear stress. The slippage and heat-transfer processes of the typical non-Newtonian fluid–1% carboxymethyl cellulose solutions on the superhydrophobic coating are investigated simultaneously. A novel porous spherical type of superhydrophobic coating with a contact angle of 168° is obtained. It is found that the shear stress in electrodeposition is a key parameter to control the morphology and wetting ability of the superhydrophobic coating. The slip length and enhancement factor of heat transfer for the non-Newtonian fluid on the coating are found in a range of 20–900 µm and 1.47 experimentally. A new parameter is proposed as Reynolds number Re divided by the dimensionless slip length ls* (Re/ls*) for the heat-transfer enhancement with slippage, which can be used as the guide for designing coating and selecting the operating conditions. The Re/ls* is <4, which can enhance the heat transfer via the slippage.

Place, publisher, year, edition, pages
John Wiley & Sons, 2022
Keywords
heat-transfer enhancement, non-Newtonian fluids, slippage, superhydrophobic surfaces, thermal resistance
National Category
Physical Chemistry
Research subject
Energy Engineering; Machine Elements
Identifiers
urn:nbn:se:ltu:diva-93737 (URN)10.1002/admi.202201224 (DOI)000867409300001 ()2-s2.0-85139752313 (Scopus ID)
Funder
Swedish Energy Agency, 45957-1Swedish Research Council Formas, 2019-01162
Note

Validerad;2022;Nivå 2;2022-12-05 (joosat);

Funder: National Natural Science Foundation of China (22178160, 21838004, 21808102); State Key Laboratory of Materials‐Oriented Chemical Engineering (ZK202005); Youth Foundation of Jiangsu Province (BK202203499);  Postgraduate Research & Practice Innovation Program of Jiangsu Province (SJCX21_0503); “Jiangsu Specially-Appointed Professor Plan” and “Excellent postdoctoral program” of Jiangsu Province

Available from: 2022-10-28 Created: 2022-10-28 Last updated: 2022-12-05Bibliographically approved
Mu, L., Dong, Y., Li, L., Gu, X. & Shi, Y. (2021). Achieving High Value Utilization of Bio-oil from Lignin Targeting for Advanced Lubrication. ES Materials & Manufacturing, 11, 72-80
Open this publication in new window or tab >>Achieving High Value Utilization of Bio-oil from Lignin Targeting for Advanced Lubrication
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2021 (English)In: ES Materials & Manufacturing, ISSN 2578-0611, Vol. 11, p. 72-80Article in journal (Refereed) Published
Abstract [en]

High-value utilization of biomass has been driven by increasingly growing industrial demands. Herein, we offer a strategy composed of depolymerization and esterification reaction of lignin to transfer to bio-oil with high liquid yield (79.75~85.25%), which is demonstrated as a high performance lubricant. Overall, the bio-oil has the excellent lubrication properties, where a significant wear reduction of 97.6% was observed as compared with polyethylene glycol 200. Meanwhile, the more ether and less acid in bio-oil could improve the anti-wear properties. This work provides a new application of utilizing lignin in advanced lubrication systems.

Place, publisher, year, edition, pages
Engineered Science Publisher, 2021
Keywords
Lignin, High-value, Lubrication, Bio-oil
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-83615 (URN)10.30919/esmm5f1146 (DOI)2-s2.0-85135716737 (Scopus ID)
Note

Validerad;2021;Nivå 1;2021-04-13 (johcin)

Available from: 2021-04-13 Created: 2021-04-13 Last updated: 2022-08-22Bibliographically approved
Wu, J., Yin, X., Mu, L., Feng, X., Lu, X. & Shi, Y. (2021). Hollow IF-MoS2/r-GO Nanocomposite Filled Polyimide Coating with Improved Mechanical, Thermal and Tribological Properties. Coatings, 11(1), Article ID 25.
Open this publication in new window or tab >>Hollow IF-MoS2/r-GO Nanocomposite Filled Polyimide Coating with Improved Mechanical, Thermal and Tribological Properties
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2021 (English)In: Coatings, ISSN 2079-6412, Vol. 11, no 1, article id 25Article in journal (Refereed) Published
Abstract [en]

Polyimide (PI) is one of the most excellent polymers for coating. However, the high friction coefficient and the high wear rate of pure PI limit its further applications. In this work, the hollow inorganic fullerene-like MoS2/reduced graphene oxide (HIF-MoS2/r-GO) nanocomposite filled PI coating is prepared by in situ polymerization. Reinforcement in mechanical strength and thermal stability is realized on the PI composite coating with incorporation of HIF-MoS2/r-GO, which performs better than carbon nanofiber (CNF). Reduced elastic modulus and hardness of HIF-MoS2/r-GO/PI coating is increased by 8.3% and 4.8%, respectively. The addition of HIF-MoS2/r-GO also results in 24% higher residual mass at 800 °C than CNF. Tribological study indicates that, HIF-MoS2/r-GO/PI achieves a wear rate reduction of 79% compared with pure PI under dry sliding condition, which is much more effective than other nanofillers including CNF, r-GO nanosheets and MoS2 nanoparticles. Under ionic liquid-lubricated condition, the presence of HIF-MoS2/r-GO in PI results in a 30% reduction in wear rate and 10% reduction in friction coefficient as compared to pure PI. It is thought that the HIF-MoS2/r-GO in PI can be slowly released to the frictional interface and form a protective film during sliding, in this way the aggregation problem is successfully solved.

Place, publisher, year, edition, pages
MDPI, 2021
Keywords
nanocomposite coating, structure, reinforcement, friction and wear, graphene, inorganic fullerene-like MoS2
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-82388 (URN)10.3390/coatings11010025 (DOI)000610001000001 ()2-s2.0-85098851107 (Scopus ID)
Funder
Vinnova, 2019-04866The Kempe Foundations, JCK-1740, JCK-1903.1Swedish Research Council Formas, 2016-01098, 2019-00904Swedish Research Council, 2019-04941Swedish Energy Agency, 2017-008200, 2018-003910
Note

Validerad;2021;Nivå 2;2021-01-14 (alebob);

Finansiär: National Natural Science Foundation of China (21908093, 21808102, 21838004, 91934302), China Postdoctoral Science Foundation (2020M671461)

Available from: 2021-01-14 Created: 2021-01-14 Last updated: 2021-02-11Bibliographically approved
Patel, A., Mu, L., Shi, Y., Rova, U., Christakopoulos, P. & Matsakas, L. (2021). Single-Cell Oils from Oleaginous Microorganisms as Green Bio-Lubricants: Studies on Their Tribological Performance. Energies, 14(20), Article ID 6685.
Open this publication in new window or tab >>Single-Cell Oils from Oleaginous Microorganisms as Green Bio-Lubricants: Studies on Their Tribological Performance
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2021 (English)In: Energies, E-ISSN 1996-1073, Vol. 14, no 20, article id 6685Article in journal (Refereed) Published
Abstract [en]

Biolubricants refer to eco-friendly, biodegradable, and non-toxic lubricants. Their applications are still limited compared to mineral oils; however, their sustainable credentials are making them increasingly attractive. Vegetable oils are frequently used for this purpose. However, vegetable oils have issues of low lipid productivity, dependence on climatic conditions, and need for agricultural land. Microbial oils represent a more sustainable alternative. To ensure their widespread applicability, the suitability of microbial oils from a physicochemical point of view needs to be de-termined first. In this study, oils obtained from various oleagenic microbes—such as microalgae, thraustochytrids, and yeasts—were characterized in terms of their fatty acid profile, viscosity, friction coefficient, wear, and thermal stability. Oleaginous microalgal strains (Auxenochlorella protothe-coides and Chlorella sorokiniana), thraustochytrids strains (Aurantiochytrium limacinum SR21 and Au-rantiochytrium sp. T66), and yeast strains (Rhodosporidium toruloides and Cryptococcus curvatus) synthesized 64.5%, 35.15%, 47.89%, 47.93%, 56.42%, and 52.66% of lipid content, respectively. Oils from oleaginous microalgae (A. protothecoides and C. sorokiniana) and yeasts (R. toruloides and C. curvatus) possess excellent physicochemical and tribological qualities due to high amount of monounsatu-rated fatty acids (oleic acid C18:1 content, 56.38%, 58.82%, 46.67%, 38.81%) than those from oleaginous thraustochytrids (A. limacinum SR21 and Aurantiochytrium sp. T66; 0.96%, 0.08%, respectively) supporting their use as renewable and biodegradable alternatives to traditional mineral oil-based lubricants. Oil obtained from microalgae showed a lower friction coefficient than oils obtained from yeasts and thraustochytrids.

Place, publisher, year, edition, pages
MDPI, 2021
Keywords
microbial oil, tribology, microalgae, yeast, thraustochytrids, biolubricants
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Biochemical Process Engineering; Machine Elements
Identifiers
urn:nbn:se:ltu:diva-87724 (URN)10.3390/en14206685 (DOI)000715306200001 ()2-s2.0-85117280607 (Scopus ID)
Funder
Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning, 2019-01162Swedish Research Council, .2019-04941
Note

Validerad;2021;Nivå 2;2021-11-02 (beamah)

Available from: 2021-11-02 Created: 2021-11-02 Last updated: 2023-09-05Bibliographically approved
Zhou, Q., Dong, L., Wu, J., Shi, Y., Feng, X., Lu, X., . . . Mu, L. (2021). Versatile Ionic Gel Driven by Dual Hydrogen Bond Networks: Toward Advanced Lubrication And Self-Healing. ACS Applied Polymer Materials, 3(11), 5932-5941
Open this publication in new window or tab >>Versatile Ionic Gel Driven by Dual Hydrogen Bond Networks: Toward Advanced Lubrication And Self-Healing
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2021 (English)In: ACS Applied Polymer Materials, ISSN 2637-6105, Vol. 3, no 11, p. 5932-5941Article in journal (Refereed) Published
Abstract [en]

From one to more, the same raw materials giving rise to multifarious products is one of the goals of researchers to pursue industrial efficiency. Herein, we designed a formula (controlling the content of the matrix) to prepare two functional ionic gels, integrating the excellent lubrication, thermal conductivity, and self-healing ability to meet different industrial demands of the lubrication and biomedical fields. Deep eutectic solvents (DESs) of urea/choline chloride (UCC) and glycerol/choline chloride (GCC) were locked in polyacrylamide (PAM) ionic gel formed by acrylamide (AM) and a photoinitiator by freer-adical polymerization. The unique dual hydrogen bond network in the ionic gel causes the material to exhibit a low wear rate, which can effectively reduce the wear of metal contact. With the addition of PAM, the ionic gel has excellent mechanical strength and good recovery performance. Unexpectedly, this dense hydrogen bond network enhances thermal conductivity by optimizing phonon and electron transfer. The versatile ionic gel has a good application prospect as a substitute for industrial lubricants and medical device materials.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2021
Keywords
ionic gel, dual hydrogen bond networks, lubrication, self-healing, thermal conductivity, mechanical strength
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-88126 (URN)10.1021/acsapm.1c01189 (DOI)000719860800060 ()2-s2.0-85118694868 (Scopus ID)
Note

Validerad;2021;Nivå 2;2021-11-30 (johcin);

For funding details: https://pubs.acs.org/doi/10.1021/acsapm.1c01189

Available from: 2021-11-30 Created: 2021-11-30 Last updated: 2021-12-09Bibliographically approved
Shetty, P., Mu, L. & Shi, Y. (2020). Fat mimicking compounds as grease thickeners in Poly(ethylene glycol)/water: Adopting the solution from history. Journal of Colloid and Interface Science, 578, 619-628
Open this publication in new window or tab >>Fat mimicking compounds as grease thickeners in Poly(ethylene glycol)/water: Adopting the solution from history
2020 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 578, p. 619-628Article in journal (Refereed) Published
Abstract [en]

Water-based lubricants are thought to be the next generation green lubricants, however, there are very few developments of aqueous grease lubricants. Here, water-based grease lubricants were developed using the food fat replacers. The concept of using fat replacers was inspired by the historical usage of fat as a lubricant. Dextrins were chosen as the fat replacers and mixture of water and PEG as the base fluid. Dextrins with different molecular weights were selected to study its effect on the rheological, tribological and thermal behavior of the gels. It was found that only higher molecular weight dextrins will form the colloidal gels, whereas low molecular weight dextrins will form the colloidal solution. The SEM images of the dried samples showed the agglomerated micro-spherical network with the void to hold the base fluid. It was found that, at an optimum concentration, the fat replacers showed 35–58% lower friction and 29–41% lower wear than the pure PEG200/water solution regardless of their molecular weight. The spherical shaped colloidal particles will form the film over the metal surface by nano-filling and these particles will act as nano-bearings which will reduce the wear and friction. These gel lubricants can be used where the highly biodegradable and bio-compatible green lubricant is needed.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Maltodextrin, Gel lubricant, Grease, Nano-bearing, Colloid
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-79601 (URN)10.1016/j.jcis.2020.06.039 (DOI)000571859100001 ()32554144 (PubMedID)2-s2.0-85086430682 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-06-26 (alebob)

Available from: 2020-06-16 Created: 2020-06-16 Last updated: 2020-10-12Bibliographically approved
Wang, R., Mu, L., Bao, Y., Lin, H., Ji, T., Shi, Y., . . . Wu, W. (2020). Holistically Engineered Polymer–Polymer and Polymer–Ion Interactions in Biocompatible Polyvinyl Alcohol Blends for High‐Performance Triboelectric Devices in Self‐Powered Wearable Cardiovascular Monitorings. Advanced Materials, 32(32), Article ID 2002878.
Open this publication in new window or tab >>Holistically Engineered Polymer–Polymer and Polymer–Ion Interactions in Biocompatible Polyvinyl Alcohol Blends for High‐Performance Triboelectric Devices in Self‐Powered Wearable Cardiovascular Monitorings
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2020 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 32, no 32, article id 2002878Article in journal (Refereed) Published
Abstract [en]

The capability of sensor systems to efficiently scavenge their operational power from stray, weak environmental energies through sustainable pathways could enable viable schemes for self‐powered health diagnostics and therapeutics. Triboelectric nanogenerators (TENG) can effectively transform the otherwise wasted environmental, mechanical energy into electrical power. Recent advances in TENGs have resulted in a significant boost in output performance. However, obstacles hindering the development of efficient triboelectric devices based on biocompatible materials continue to prevail. Being one of the most widely used polymers for biomedical applications, polyvinyl alcohol (PVA) presents exciting opportunities for biocompatible, wearable TENGs. Here, the holistic engineering and systematic characterization of the impact of molecular and ionic fillers on PVA blends’ triboelectric performance is presented for the first time. Triboelectric devices built with optimized PVA‐gelatin composite films exhibit stable and robust triboelectricity outputs. Such wearable devices can detect the imperceptible skin deformation induced by the human pulse and capture the cardiovascular information encoded in the pulse signals with high fidelity. The gained fundamental understanding and demonstrated capabilities enable the rational design and holistic engineering of novel materials for more capable biocompatible triboelectric devices that can continuously monitor vital physiological signals for self‐powered health diagnostics and therapeutics.

Place, publisher, year, edition, pages
John Wiley & Sons, 2020
Keywords
biocompatible polymers, cardiovascular monitoring, self‐powered devices, triboelectric nanogenerators, wearable sensors
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-80136 (URN)10.1002/adma.202002878 (DOI)000543738100001 ()32596980 (PubMedID)2-s2.0-85087159948 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-08-20 (alebob)

Available from: 2020-07-01 Created: 2020-07-01 Last updated: 2020-08-20Bibliographically approved
Patel, A., Mu, L., Shi, Y., Rova, U., Christakopoulos, P. & Matsakas, L. (2020). Novel Biorefinery Approach Aimed at Vegetarians Reduces the Dependency on Marine Fish Stocks for Obtaining Squalene and Docosahexaenoic Acid. ACS Sustainable Chemistry and Engineering, 8(23), 8803-8813
Open this publication in new window or tab >>Novel Biorefinery Approach Aimed at Vegetarians Reduces the Dependency on Marine Fish Stocks for Obtaining Squalene and Docosahexaenoic Acid
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2020 (English)In: ACS Sustainable Chemistry and Engineering, E-ISSN 2168-0485, Vol. 8, no 23, p. 8803-8813Article in journal (Refereed) Published
Abstract [en]

Squalene and docosahexaenoic acid (DHA) have gained substantial market share as dietary supplements and vital nutraceuticals due to their beneficial effects on human health. Marine fish are the main commercial source of these nutraceuticals, but a growing global demand, issues of sustainability, and an expanding vegan and vegetarian population has prompted the search for alternatives. Oils obtained from oleaginous microorganisms such as microalgae, diatoms, certain fungi, and thraustochytrids are alternatives to fish oils for omega-3 fatty acids. Among these, DHA is now being mined from thraustochytrids due to its highest proportion in their lipids, however, this strategy is not cost-effective. One way to offset such elevated production costs is to simultaneously extract other high value-added biological products from these oleaginous microorganisms. Here, we propose a novel biorefinery process based on single-step purification of squalene from total lipids extracted from an oleaginous thraustochytrid cultivated on non-edible forest biomass. To render the process economically feasible and sustainable, additional squalene-free lipids were exploited for enrichment of DHA; whereas leftover lipids generated as by-product during the process were tested as a novel biolubricant.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2020
Keywords
DHA, squalene, biolubricant, biorefinery, thraustochytrids
National Category
Bioprocess Technology Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Biochemical Process Engineering; Machine Elements
Identifiers
urn:nbn:se:ltu:diva-79161 (URN)10.1021/acssuschemeng.0c02752 (DOI)000541876900034 ()2-s2.0-85085628061 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-07-10 (johcin)

Available from: 2020-06-03 Created: 2020-06-03 Last updated: 2023-09-05Bibliographically approved
Shetty, P., Mu, L. & Shi, Y. (2020). Polyelectrolyte Cellulose Gel with PEG/Water: Toward Fully Green Lubricating Grease. Carbohydrate Polymers, 230, Article ID 115670.
Open this publication in new window or tab >>Polyelectrolyte Cellulose Gel with PEG/Water: Toward Fully Green Lubricating Grease
2020 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 230, article id 115670Article in journal (Refereed) Published
Abstract [en]

Developing a fully green lubricant is an urgent need due to the growing consciousness of environmental protection and dwindling resources. In this work, fully green gel lubricants were developed out of cellulose derivatives as gelator and mixture of water and poly(ethylene glycol) 200 (PEG 200) as the base fluid. The non-ionic hydroxyethyl cellulose (HEC) and anionic sodium carboxymethyl cellulose (NaCMC) were chosen to understand the effect of ionic and non-ionic gelators on the thermal, rheological and the tribological properties of the gel lubricant. HEC or NaCMC is demonstrated as effective additive to reduce wear, stabilize friction coefficient and enhance the thermal stability of developed lubricants. It is shown that anionic gelator will result in producing lower friction and wear in comparison to non-ionic gelator, which may be attributed to the possible tribo-film formation due to the negative charge in the NaCMC molecules and its larger molecular weight.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Cellulose, Green, lubricant, PEG/Water, Gel
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-76921 (URN)10.1016/j.carbpol.2019.115670 (DOI)000504402300109 ()31887933 (PubMedID)2-s2.0-85075898313 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-01-13 (johcin)

Available from: 2019-11-28 Created: 2019-11-28 Last updated: 2022-10-27Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-4893-0886

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