Article
Chemistry, Applied
Svetlana N. Gorbacheva, Anastasiya Y. Yadykova, Sergey O. Ilyin
Summary: A new approach to produce biodegradable low-temperature greases based on CAB/ATBC systems is proposed, with CAB gelation reducing the wear coefficient but increasing the friction coefficient. The introduction of various solid additives, especially PTFE at 10% concentration, has been shown to improve the tribological properties of gel greases.
CARBOHYDRATE POLYMERS
(2021)
Article
Biochemistry & Molecular Biology
Jose F. Rubio-Valle, Jose E. Martin-Alfonso, Maria E. Eugenio, David Ibarra, Jose M. Oliva, Paloma Manzanares, Concepcion Valencia
Summary: This work presents the chemical and structural characterization of a lignin-rich residue from bioethanol production of olive stones, and explores its potential for developing nanostructures through electrospinning and castor oil structuring. The results reveal that the olive stone lignin-rich residue (OSL) has a high lignin content and specific structural properties. The electrospun nanostructures obtained from OSL and cellulose triacetate exhibit different morphologies, which are highly influenced by the rheological properties of the polymer solutions. Furthermore, the uniform nanofiber mats can be dispersed in castor oil, forming gel-like dispersions. The rheological properties are affected by the membrane concentration, OSL:CT weight ratio, and morphology of the electrospun nanostructures.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2024)
Article
Chemistry, Applied
Annelies E. Blok, Dieuwerke P. Bolhuis, Heleen V. M. Kibbelaar, Daniel Bonn, Krassimir P. Velikov, Markus Stieger
Summary: The utilization of plant waste materials for functional ingredients such as microfibrillated cellulose (MFC) has potential in sustainable food production. This study compared the rheological, tribological, and sensory properties of MFC dispersions and xanthan gum (XG) solutions, and found significant differences in sensory perceptions at higher concentrations of MFC, indicating the need for further improvement.
FOOD HYDROCOLLOIDS
(2021)
Article
Materials Science, Paper & Wood
Claudia Roman, Miguel A. Delgado, Samuel D. Fernandez-Silva, Moises Garcia-Morales
Summary: The study demonstrates that the pre-treatment of nanofibers has a significant impact on the flow and shear behavior of lubricating oleogels. Oleogel based on chemically-prepared nanofibers is more sensitive to temperature and large shear deformations compared to oleogel based on mechanically-prepared nanofibers.
Article
Polymer Science
Rodrigo alvarez-Barajas, Antonio A. Cuadri, Francisco J. Navarro, Francisco J. Martinez-Boza, Pedro Partal
Summary: This study explores the use of three native lignin-rich products from industrial bioethanol production and pulping as emulsifiers, finding that emulsification pH strongly affects the stabilization ability of lignins.
Article
Chemistry, Applied
Shuo Mu, Fazheng Ren, Qingwu Shen, Hui Zhou, Jie Luo
Summary: The aim of this study was to investigate the relationships between tribological, rheological, and creamy mouthfeel properties of emulsion-filled gels. The results showed that increasing the fat content of the gel led to decreased viscosity and friction coefficients, as well as an increased sliding speed. Microscopic observations revealed that as the sliding speed increased, the gel disintegrated and released oil droplets, which coalesced with increasing fat content. Sensory analysis demonstrated that higher fat content resulted in increased creaminess, smoothness, thickness, and mouth-coating intensity.
FOOD HYDROCOLLOIDS
(2022)
Article
Chemistry, Applied
M. L. Olivares, L. M. Costabel, S. E. Zorrilla, J. de Vicente
Summary: Different microstructures of calcium-induced skim milk gels can be obtained by varying the concentration of skim milk powder and calcium salt added, as well as adjusting pH. Increasing concentrations of skim milk powder and calcium chloride improve the physical properties and lubrication characteristics of the gels.
FOOD HYDROCOLLOIDS
(2022)
Article
Chemistry, Applied
Cynthia Hopson, Victoria Rigual, M. Virginia Alonso, Mercedes Oliet, Francisco Rodriguez
Summary: 3D printing is a promising technology for fabricating cost-effective and customizable objects. Research on bio-based inks with recyclable and eco-friendly properties is increasing due to the need to substitute fossil fuels as raw materials. In this study, ionogels and hydrogels were formulated for 3D printing using cellulose dissolved in [Emim] [DMP] at different concentrations. Rheological properties and printability were compared with a commercial ink, and the 4 wt% ink was found to have the best print resolution and fidelity. These 3D printed cellulose ionogels and hydrogels may have applications in the electrochemical and medical fields, respectively.
CARBOHYDRATE POLYMERS
(2023)
Article
Chemistry, Physical
G. Poggi, D. Chelazzi, M. Laurati
Summary: The addition of cellulose nanocrystals accelerates gelation kinetics and increases the stiffness of gels formed by silk fibroin. Continuous shear tests revealed a higher yield stress in silk fibroin/cellulose nanocrystal gels, with the yield strain decreasing at higher shear rates possibly due to shear-induced compaction. Large amplitude oscillatory shear (LAOS) measurements demonstrated a broad and gradual transition from solid to fluid in the gels, with two distinct yield strains indicating different stages of fluidization.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Materials Science, Paper & Wood
Behzad Zakani, Hayder Salem, Sohrab Entezami, Ahmad Sedaghat, Dana Grecov
Summary: Industrial lubricants improve machinery performance by reducing wear and friction between mechanical components. Developing eco-friendly lubricants is crucial for environmental protection. This study investigates the effect of nanoparticle concentration on the lubrication performance of cellulose nanocrystal (CNC) aqueous suspensions, and finds an optimum concentration range under mixed lubrication mode.
Article
Engineering, Environmental
Claudia Roman, Miguel A. Delgado, Samuel D. Fernandez-Silva, Moises Garcia-Morales
Summary: Sustainable lubricating oleogels were obtained by utilizing the high thickening capacity of cellulose nanofibers in castor oil. The effect of pulp bleaching on the thermo-rheological behavior of the oleogels was analyzed, and it was found that oleogels prepared with nanofibers from unbleached pulp performed better under shear deformations and temperature changes, demonstrating a strong capacity for structure recovery.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Materials Science, Paper & Wood
J. F. Rubio-Valle, C. Valencia, M. Sanchez, J. E. Martin-Alfonso, J. M. Franco
Summary: In this study, electrospun Kraft lignin/cellulose acetate nanostructures were produced and investigated as structuring or thickening agents in castor oil for lubricating applications. The morphology of the electrospun nanofibers was influenced by the rheological properties, electrical conductivity, and surface tension of KL/CA solutions, which were in turn affected by the chemical structure and composition of the Kraft lignins. The resulting oleogels, based on KL/CA electrospun nanostructures, exhibited desirable rheological and tribological properties, making them a promising sustainable alternative to conventional lubricating greases.
Article
Polymer Science
Diana Elena Ciolacu, Daniela Rusu, Raluca Nicoleta Darie-Nita, Daniel Timpu, Florin Ciolacu
Summary: Novel hydrogels were prepared from different cellulose allomorphs and their properties were investigated. The type of cellulose allomorph was found to have a complex influence on the swelling degree and morphological characteristics of the hydrogels. The cross-linking of cellulose allomorphs led to hydrogels with different performances.
Article
Materials Science, Multidisciplinary
M. Borrego, J. E. Martin-Alfonso, C. Valencia, Maria del Carmen Sanchez Carrillo, J. M. Franco
Summary: The development of environment-friendly natural polymer gel-like dispersions in oil media, with functional properties, in terms of formulation design and synthesis protocol, is still a cutting-edge research area. This study focuses on the manufacture of electrospun ethylcellulose (EC) nanofibrous webs and their usage as thickeners for vegetable oils. The concentration, molecular weight, and binary solvent systems of EC were found to affect the electrospinnability and rheological properties of the nanofiber dispersions. The morphology of the EC nanofiber web plays a crucial role in their physical stabilization and rheological behavior. This work proposes an innovative approach to produce bio-based oleogel-like dispersions that have potential applications in various sectors.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Patrick Petschacher, Reza Ghanbari, Carina Sampl, Helmar Wiltsche, Roland Kadar, Stefan Spirk, Tiina Nypelo
Summary: Sulfate groups on cellulose nanocrystals (CNCs) provide colloidal stability, and the introduction of sodium counter cations enables drying of the CNC suspensions without irreversible aggregation. Ion exchange is an efficient method to exchange sulfate half esters with alkali metal cations. K-CNC exhibits different rheological and birefringence properties compared to other alkali metal modifications.
Article
Biochemistry & Molecular Biology
Antonio M. Borrero-Lopez, Concepcion Valencia, David Ibarra, Ignacio Ballesteros, Jose M. Franco
Summary: This study explores the potential of using lignin-enriched waste products from bioethanol production as thickeners for lubricating greases. The content of lignin and hydroxyl ratio were found to influence the NCO-functionalization and rheological response of the resulting oleogels, with barley straw residues exhibiting the highest storage modulus.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Polymer Science
David Ibarra, Raquel Martin-Sampedro, Bernd Wicklein, Antonio M. Borrero-Lopez, Concepcion Valencia, Ana Valdehita, Jose M. Navas, Maria E. Eugenio
Summary: The sustainable potential of fast-growing poplar wood as a source for producing cellulose nanofibers (CNFs) was evaluated. The resulting poplar CNFs exhibited properties comparable to eucalypt CNFs, making them a promising alternative. Furthermore, the pH-sensitive hydrogel application of poplar CNFs was identified.
Article
Polymer Science
M. Borrego, J. E. Martin-Alfonso, C. Valencia, M. C. Sanchez, J. M. Franco
Summary: This work focuses on improving the electrospinnability of low-sulfonate lignin/polyvinylpyrrolidone solutions by adding surfactants and studying the resulting nanofibers' ability to structure castor oil. The addition of surfactants improves electrospinnability, producing more compact and uniform fiber mats in certain systems. These nanofiber mats dispersed in castor oil can generate physically stable strong oleogels, which exhibit excellent lubrication performance and potential applications as lubricants.
Article
Agricultural Engineering
J. F. Rubio-Valle, M. C. Sanchez, C. Valencia, J. E. Martin-Alfonso, J. M. Franco
Summary: In this study, electrospun lignin/cellulose acetate fiber-bead nanostructures were developed as structuring agents for vegetable oils to be used as eco-friendly lubricating oleogels. The morphology of the electrospun nanostructures was found to be strongly dependent on the rheological properties of the biopolymer solution. The rheological properties of these gel-like dispersions can be tailored through concentration and ratio, and the resulting oleogels have comparable properties to conventional lubricants.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Chemistry, Physical
E. Cortes-Trivino, J. Cubero-Cardoso, A. Tenorio-Alfonso, M. A. Fernandez-Recamales, C. Valencia, J. Urbano, J. M. Franco
Summary: This study investigates the usage of natural deep eutectic solvents (NADESs) with different hydroxyl group content as a matrix base in reactions involving lignin-enriched fraction. The NADESs were prepared by mixing citric acid with glycerol, xylitol, and sucrose as the hydrogen bond donor compounds. Waste lignocellulose was additionally epoxidised to be used as a thickening agent for the NADESs. The research successfully achieved chemical interaction between NADESs and epoxidised lignocellulose, resulting in various rheological responses.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Materials Science, Multidisciplinary
M. Borrego, J. E. Martin-Alfonso, C. Valencia, Maria del Carmen Sanchez Carrillo, J. M. Franco
Summary: The development of environment-friendly natural polymer gel-like dispersions in oil media, with functional properties, in terms of formulation design and synthesis protocol, is still a cutting-edge research area. This study focuses on the manufacture of electrospun ethylcellulose (EC) nanofibrous webs and their usage as thickeners for vegetable oils. The concentration, molecular weight, and binary solvent systems of EC were found to affect the electrospinnability and rheological properties of the nanofiber dispersions. The morphology of the EC nanofiber web plays a crucial role in their physical stabilization and rheological behavior. This work proposes an innovative approach to produce bio-based oleogel-like dispersions that have potential applications in various sectors.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Materials Science, Paper & Wood
J. F. Rubio-Valle, C. Valencia, M. Sanchez, J. E. Martin-Alfonso, J. M. Franco
Summary: In this study, electrospun Kraft lignin/cellulose acetate nanostructures were produced and investigated as structuring or thickening agents in castor oil for lubricating applications. The morphology of the electrospun nanofibers was influenced by the rheological properties, electrical conductivity, and surface tension of KL/CA solutions, which were in turn affected by the chemical structure and composition of the Kraft lignins. The resulting oleogels, based on KL/CA electrospun nanostructures, exhibited desirable rheological and tribological properties, making them a promising sustainable alternative to conventional lubricating greases.
Article
Polymer Science
Maria Borrego, Jose E. Martin-Alfonso, Concepcion Valencia, M. Carmen Sanchez, Jose M. Franco
Summary: This study introduced a novel strategy for manufacturing thickened gel-like castor oil formulations by dispersing electrospun lignin/ethylcellulose nanostructures, potentially serving as eco-friendly lubricating greases. By controlling the ratio and concentration of lignin and ethylcellulose, the morphology and dispersibility of the nanostructures in oil can be adjusted, demonstrating satisfactory frictional response comparable to traditional lithium-lubricating greases.
Article
Chemistry, Analytical
Laura Aislinn Carrasco-Chavez, Jose F. Rubio-Valle, Abimael Jimenez-Perez, Jose E. Martin-Alfonso, Amanda Carrillo-Castillo
Summary: Chalcogenides semiconductors, such as cadmium sulfide (CdS), have potential applications in optoelectronic devices. This study focuses on the synthesis and analysis of CdS thin films and CdS nanoparticles. The CdS thin films were deposited using chemical bath deposition, while the CdS nanoparticles were synthesized via the precipitation method. The CdS nanoparticles were incorporated on the CdS thin films to form a homojunction. The resulting modified thin films exhibited good transmittance, with a band gap between 2.12 eV and 2.35 eV. Raman spectroscopy confirmed the hexagonal and cubic crystalline structure of the CdS thin films/CdS nanoparticles, with an average crystallite size of 21.3-28.4 nm. The interface between the CdS nanoparticles and metal exhibited ohmic behavior.
Article
Biochemistry & Molecular Biology
Antonio M. Borrero-Lopez, Ling Wang, Haiming Li, Tainise Lourencon, Concepcion Valencia, Jose M. Franco, Orlando J. Rojas
Summary: Acetylated Kraft lignins were used to structure vegetable oils into oleogels. Microwave-assisted acetylation at higher temperatures resulted in gel-like oil dispersions with improved viscoelastic properties and stronger shear-thinning character, along with enhanced long-term stability. The modified lignins enhanced the stability of water-in-oil Pickering emulsions by enhancing hydrogen bonding between the oil and nanoparticles.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Chemistry, Multidisciplinary
Maria Borrego, Erik Kuhn, Jose E. Martin-Alfonso, Jose M. Franco
Summary: In this study, different lignin nanostructures were obtained through electrospinning and used as thickeners in bio-based lubricating greases. The impact of nanofibrous network morphology on friction and wear was investigated. The results showed that homogeneous bead-free nanofiber mats as thickeners can effectively reduce friction and wear.
Article
Engineering, Environmental
J. F. Rubio-Valle, C. Valencia, M. C. Sanchez, J. E. Martin-Alfonso, J. M. Franco
Summary: This study explores the use of spent coffee grounds and post-consumer PET bottles to produce electrospun composite nanofibers, aiming to develop a new route for upcycling them into high-value oil-based products. By adjusting the ratio of coffee grounds and PET bottles, the properties of the fibers and oleogels can be modified.
RESOURCES CONSERVATION AND RECYCLING
(2023)
Article
Engineering, Mechanical
Busra Duran, Jerome Cavoret, David Philippon, Fabrice Ville, Arnaud Ruellan, Frank Berens
Summary: This study analyzes the changes in the physicochemical properties and tribological performances of gear transmission oils during field operation, finding differences from traditional engine oils.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Baocheng Liu, Hongsheng Chen, Jun Zhou, Jing Wang, Wenxian Wang, Xiaochun Chen, Sanxiao Xi
Summary: This study used fast hot pressing sintering to fabricate WC/AlCoCrFeNi2.1 metal matrix composites (MMCs). It was found that the addition of reinforced particles increased the microhardness, nanoindentation and wear resistance of the MMCs. During frictional processes, an oxide film formed, providing material protection, enhancing stability and reducing friction-induced losses.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Pradip Kumar Verma, Alok Singh
Summary: This study investigates the mechanical properties and wear resistance of CoMoMnNiV high entropy alloy reinforced aluminium matrix composite processed through stir-squeeze casting assisted with an ultrasonic transducer. The results show significant improvements in mechanical properties and wear resistance, with the composite containing 8 wt% HEA demonstrating the highest resistance to wear. Optical microscopy, SEM, and an optical profilometer were used for a thorough examination of the microstructure and worn surface.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Zhenghai Yang, Yingjian Song, Jinlong Jiao, Wenbo Li, Bao Shangguan, Yongzhen Zhang
Summary: This study investigated the friction, wear properties, and current-carrying properties of copper-graphite composites paired with brass C28000. The results showed that the current-carrying properties of the composite materials were excellent, but their wear rate was the main limiting factor. Furthermore, an increase in the thickness of the graphite layer led to an improvement in the uniformity of damage.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Moustafa Mahmoud Yousry Zaghloul, Karen Steel, Martin Veidt, Michael T. Heitzmann
Summary: This research evaluates and compares the impact of different material types on the tribological characteristics of Polyamide 6 composites, and finds that glass fiber-reinforced Polyamide 6 exhibits better friction and wear performance under high-pressure velocity factors.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Shaoqing Qin, Lida Zhu
Summary: In this paper, the surface and subsurface damage of laser assisted grinding CrCoNi medium entropy alloys were investigated using molecular dynamics simulations. The results showed that the application of laser energy can reduce cutting forces and minimize subsurface damage.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Kaikui Zheng, Youxi Lin, Tingzheng Lai, Chenghui Gao, Ming Liu, Zhiying Ren
Summary: The study investigated the use of waste foundry resin-bonded sand as a substitute for copper in resin-based brake material. It found that the waste sand was more favorable for improving the overall friction and wear properties of the material compared to copper. Waste sand benefited the material by forming a friction layer, leading to increased friction coefficient and stability. Brake material with 10-15% waste sand showed excellent heat-fade resistance.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Dayang Li, Fanhao Zhou, Yutong Gao, Kun Yang, Huimin Gao
Summary: This article introduces a continuous prediction model based on deep learning for predicting the power output of steam turbines. The model uses long short term memory (LSTM) method to develop a trend prediction model and optimizes the prediction model through feature selection method. Experimental results show that the model outperforms other models in terms of prediction performance.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Tomohiro Toyoda, Ryo Yasuike, Toshihiro Noda
Summary: In this study, a elasto-plastic constitutive model of friction incorporating the concept of superloading surface was developed based on the subloading friction model. The proposed model achieves a smooth transition of friction by describing the evolution rule of structure, treating the state with static friction coefficient larger than kinetic friction coefficient as the bulkiness of structure. The positive definiteness of the plastic multiplier, loading condition, and material parameters were derived, and the validity of the proposed model in accordance with the subloading-friction model was confirmed through a stick-slip simulation of a mass-spring system.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
P. Balaji, B. Surya Rajan, K. Sathickbasha, P. Baskara Sethupathi, Deviga Magadevan
Summary: This study emphasizes the importance of using a variety of solid lubricants with different oxidation temperature regimes to enhance the tribological performance of brake pads.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Jian Ma, Yancong Liu, Javad Mostaghimi, Na Zhang
Summary: This paper investigates the influence of preparation strategies on the lubrication properties of surface textures. Three laser scanning strategies are proposed to achieve a sinusoidal textured surface, and the evolution of surface structure and chemical composition is discussed. The findings show that ridge structures enhance anti-wear properties but also increase the friction coefficient. However, the oil cover preparation method prevents the formation of ridges and improves wettability.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Mohammad Roostaei, Arvin Taghizadeh Tabrizi, Hossein Aghajani
Summary: In this research, the Al2O3/MoS2 nanocomposite coating layer was successfully applied on the surface of Ti-6Al-4 V alloy. The relation between the surface characteristics and wear resistance of the coating was studied using atomic force microscopy analysis and pin-on-disk wear test method. The results showed that the nanocomposite coating significantly reduced the wear rate and provided an equation to calculate the Lancaster coefficient.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Musa Bilgin, Sener Karabulut, Halil Karakoc, Yunus Kayir, Murat Sarikaya
Summary: This study investigates various methods to improve the machinability efficiency of Inconel 718 alloy while considering their effect on microstructural properties. The results show that hot+PMQL, hot+SiCNMQL, and hot+Al2O3-NMQL contribute significantly to the improvement of machinability characteristics. The EBSD analysis also reveals that a limited area is affected by heat in the hot machining environment and that the removal of the heated layer during milling process helps preserve the microstructure.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Q. Gao, Y. Fan, Y. G. Wu, J. L. Liu, J. Wang, L. Li
Summary: Fretting wear significantly affects the hysteresis behavior of the contact surface and leads to joint degradation. This study investigates the influence of harmonic normal force on the evolution of interface morphology and contact parameters with fretting wear. The results show that the harmonic normal force can significantly influence the hysteresis loop and the energy dissipation distribution on the contact surface.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Benjamin Weiland, Floriane Leclinche, Anis Kaci, Brigitte Camillieri, Betty Lemaire-Semail, Marie -Ange Bueno
Summary: This study presents a systematic approach to generating control signals for a tactile simulator that simulate the touch of textile fabrics. By using a friction modulation tactile surface and acquiring forces from real surfaces with artificial finger mimicking fingerprints, control signals are generated and processed in the frequency domain before sending them to the tactile stimulator. The study focuses on the potential benefits of incorporating fingerprint information in fabric simulations to achieve a more realistic tactile perception. A sensory analysis with 36 participants using the generated control signals showed better discrimination without fingerprint information.
TRIBOLOGY INTERNATIONAL
(2024)
