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Environmentally friendly tailor-made oleo-dispersions of electrospun cellulose acetate propionate nanostructures in castor oil for lubricant applications

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Nano Materials Science 2025年第1期7卷 90-104页

作者： M.A.Martín-Alfonso J.F.Rubio-Valle J.P.Hinestroza J.E.Martín-Alfonso J.M.Franco Chemical Product and Process Technology Research Center(Pro2TecS) Department of Chemical Engineering and Materials ScienceETSIUniversity of Huelva21071HuelvaSpain Department of Fiber Science and Apparel Design Cornell UniversityIthacaNY14853USA

The aim of this work is to find an alternative lubricating grease formulation that can be produced from renewable and biodegradable sources with minimal risks to human health and the *** used a castor oil and electrospun cellulose acetate propionate(CAp)as raw *** hypothesized that the acetyl and propionyl groups could provide an adequate chemical compatibility with the castor oil and that the electrospun nanostructures could enable improved physical stability by creating a variety of morphologies allowing the tailoring of the rheological and tribological properties of the resulting *** experimental results show that the use of electrospun CAp nanostructures can indeed yield physically stable formulations,even when used at low concentrations(3 wt%).The resulting dispersions went through structural transitions due to changes in the thickener morphologies and/or concentration,as shown by oscillatory rheology,oil holding capacity,tackiness,and lubrication performance in metal–metal *** found that the formulations,containing smooth or porous CAp nanofibers,at 5 wt%as a thickener,possess suitable rheological and tribological properties with a performance comparable to that of traditional lithium lubricating greases.

关键词： Cleaner products Green lubricants Nanofibers Rheology Tribology

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Biomordant assisted natural dyeing of cellulosic fibre: a greener approach

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Materials Research Innovations 2025年第1期29卷 27-34页

作者： Chowdhury, Tanvir Ahmed Khandaker, Jahirul Islam Gafur, Mohammad Abdul Repon, Md. Reazuddin Islam, Md. Kamrul Hossain, Alamgir Mollick, Swaraz Department of Physics Jahangirnagar University Dhaka Bangladesh Department of Textile Engineering Daffodil International University Dhaka Bangladesh Pilot Plant & Process Development Centre Bangladesh Council of Scientific and Industrial Research Dhaka Bangladesh Department of Bioproducts and Biosystems School of Chemical Engineering Aalto University Espoo Finland Department of Production Engineering Faculty of Mechanical Engineering and Design Kaunas University of Technology Kaunas Lithuania Department of Textile Engineering Jashore University of Science and Technology Jashore Bangladesh

Natural dyes serve as a benign alternative to their synthetic counterparts, offering a sustainable option that directly mitigates the release of toxic chemicals. In this study, cotton fabrics were dyed with neem leaf extract in acidic, neutral and alkaline condition where samples were mordanted with lemon juice. The findings revealed a direct correlation between colour strength (K/S) and pH levels, and optimal fastness properties were achieved under alkaline pH conditions when a mordant was employed. The Energy Dispersive X-ray (EDX) ensured the elemental composition of lemon juice assisted dyed fabric which indicates the effective binding of cotton fabric with neem leaves extracted dye. The Fourier Transform Infrared (FTIR) Spectroscopy analysis also confirmed the interaction of cotton fabric with dye particles. The results indicate that cotton fabric can be successfully dyed with neem leaf extract and lemon juice as the biomordant, presenting an eco-friendly and sustainable approach to dyeing practices. © 2024 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Cotton fabrics

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A classification AI model to predict choking of vibrating screen based on DEM and machine learning

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Powder Technology 2025年 460卷

作者： Arifuzzaman, S.M. Dong, Kejun Zou, Ruiping Yu, Aibing Centre for Infrastructure Engineering School of Engineering Design and Built Environment Western Sydney University NSW2751 Australia ARC Research Hub for Smart Process Design and Control Department of Chemical Engineering Monash University ClaytonVIC3800 Australia

Screening is a complicated process for classifying granular materials according to size. Choking is a vital issue in screening. It may occur when the particle flow along a screen is too slow, but slow particle flow and long residence time are beneficial to sieving performance. Therefore, a model to judge whether choking happens is useful for finding optimal operating conditions. Here, a classification model to predict screen choking is proposed by combining DEM simulation and machine learning. The model can consider various key controlling variables for particle properties and operating conditions. Using the model, safe operation condition regions without choking can be identified. Then, combining the model with our previous machine learning based process model, we can design a screening process with the desired performance. The work also shows a way of using machine learning to predict critical phenomena in particle flow. © 2025 The Authors

关键词： Consolidation

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Determining residence time distributions in oscillatory baffled reactors: A comparison between experiments and CFD-simulations

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chemical engineering and processing - process Intensification 2025年 213卷

作者： Adams, Matthias Stefanidis, Georgios D. Van Gerven, Tom Department of Chemical Engineering KU Leuven Celestijnenlaan 200F box 2424 LeuvenB-3001 Belgium School of Chemical Engineering Department of Process Analysis and Plant Design National Technical University of Athens Iroon Polytecneiou 9 Zografou 15780 Athens Greece

Oscillatory flow reactors are a process intensification technology that aims at enabling plug flow-like operation for inherently slow processes. However, the plug flow regime is usually challenging to obtain in practice. To that end, this work focuses on simulating residence time distributions in oscillatory baffled reactors with for the first time an experimental validation of the simulated results. Four different physical models are implemented to simulate residence time distributions: 2D-axisymmetric laminar, 2D-axisymmetric turbulent κ-ϵ, 3D laminar and 3D turbulent κ-ϵ. Different flow conditions are tested ranging between 50 and 250 for the net Reynolds number and 50 and 300 for the oscillatory Reynolds number. The comparison between experiments and simulations is done qualitatively and quantitatively. The quantitative parameters include: the mean residence time, the root mean square error and the number of ideal tanks in series. The results show that in almost all tested flow conditions 3D laminar physics are necessary to predict the experimental residence time distribution. However, for the tested flow parameters, literature advises in general to use 2D-axisymmetric laminar physics to model local flow patterns. This demonstrates the need for new guidelines to model global parameters in oscillatory baffled reactors and the importance of experimental validation. © 2025

关键词： Residence time distribution

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Stencil additive manufacturing: An approach to fabricating porous 3D lattice alumina structures

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Ceramics International 2025年

作者： Manca, Dario Rafael Najaf Zadeh, Hossein Bowles, Daniel Clucas, Don Watson, Matthew School of Product Design University of Canterbury Christchurch8041 New Zealand Department of Mechanical Engineering University of Canterbury Christchurch8041 New Zealand Biomolecular Interaction Centre University of Canterbury Christchurch8041 New Zealand Chemical and Process Engineering Department University of Canterbury Christchurch8041 New Zealand

This work employed the Stencil Additive Manufacturing (SAM) technique to fabricate α-alumina lattice structures. A ceramic slurry system based on Pluronic F-127 hydrogel was formulated to carry nano-sized α-alumina ceramic particles, achieving a solid loading of 37 vol%. The slurry exhibited non-Newtonian behaviour, making it suitable for stencil printing applications. Rheological characterisation revealed an elastic modulus of 19,600 kPa and a storage modulus of 996 kPa. Flow tests were successfully fitted to the Herschel-Bulkley model, yielding at 213.38 Pa, a flow index of 0.21, and a consistency index of 4259.24 Pa s, confirming the slurry's shear-thinning behaviour, an essential property for SAM. Stencil printing of ceramic hydrogel layers, followed by controlled drying and sintering at 1550 °C, resulted in the successful fabrication of rigid α-alumina ceramic parts. Post-sintering analysis demonstrated that crack-free specimens with heights up to 5.25 mm, maximum warping of 10 %, and 94–98 % density were achieved. The study highlights the potential of SAM for the additive manufacturing of ceramics, presenting a novel approach to fabricating complex ceramic structures. While the process shows promise, limitations such as channel closure during deposition and warping during drying must be addressed to further improve shape fidelity and accuracy. This research opens avenues for the future development of stencil-based additive manufacturing in ceramic production, which shows promise as a viable pathway to the mass manufacturing of parts. © 2025 The Authors

关键词： Sintering

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Short-chain fatty acids production from maize silage: impact of stepwise hydraulic retention time reduction on microbial adaptation and process output

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Biotechnology for the Environment 2025年第1期2卷 1-10页

作者： Llamas, Mercedes Villamil, John A. Greses, Silvia Tomás-Pejó, Elia González-Fernández, Cristina Biotechnological Processes Unit IMDEA Energy Móstoles Madrid Spain Circular Economy Process Design Repsol Technology Lab Móstoles Madrid Spain Department of Chemical Engineering Universitat de València Avinguda de La Universitat S/N Burjassot València Spain Department of Chemical Engineering and Environmental Technology School of Industrial Engineering University of Valladolid Valladolid Spain Institute of Sustainable Processes Valladolid Spain

The conversion of maize silage, byproduct of bioethanol production, into short-chain fatty acids (SCFAs) through anaerobic fermentation (AF) is a promising approach. Due to the diverse microbial metabolisms involved, precise control of operational parameters is crucial to maintain the stability of the AF and achieve maximum process outputs. This study investigates the impact of the stepwise hydraulic retention time (HRT) reduction on the stability of microbial communities and SCFAs production. To address this, a 40-L semi-pilot continuous stirred tank reactor was operated under different HRT conditions: 15, 12.5, 10, and 7.5 days. Results showed that the maximum bioconversion of 28% g CODSCFAs/g CODin (expressed as chemical oxygen demand [COD]) was reached at HRTs higher than 7.5 days, while the highest total SCFAs concentration of 14.3 g/L was observed at HRT of 15 days. SCFAs derived from maize silage mainly consisted of acetic, propionic, butyric, and valeric acids, maintaining a consistent profile across all evaluated HRTs. Canonical correspondence analysis results indicated synergistic and cross-feeding interactions among key microbial bacteria involved in AF such as unclassified Clostridiales, Megasphaera, Lachnospiraceae, Ruminococcaceae, and Prevotella for all tested HRTs. This finding indicated that these microorganisms were capable of maintaining their function and stability across different HRT conditions.

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Ionic liquids assisted processing of animal resources for fabrication of sustainable composite materials

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Journal of Molecular Liquids 2025年 421卷

作者： Mahmood, Hamayoun Khan, Atif Shakeel, Ahmad Uroos, Maliha Dhakal, Hom Nath Al-Khazaal, Abdulaal Zuhayr Moniruzzaman, Muhammad Department of Chemical Polymer & Composite Materials Engineering University of Engineering & Technology New Campus Lahore Pakistan Department of Chemical Polymer and Process Engineering University of Engineering &Technology Faisalabad Campus Pakistan Department of Aerospace Structures and Materials Delft University of Technology Delft2629 HS Netherlands Centre for Research in Ionic Liquids School of Chemistry University of the Punjab Quaid-e-Azam Campus Lahore Pakistan School of Mechanical and Design Engineering University of Portsmouth Anglesea Road Anglesea Building PO1 3DJ United Kingdom Department Chemical and Materials Engineering College of Engineering Northern Border University P.O. Box 1321 Arar Saudi Arabia Department of Chemical Engineering Universiti Teknologi PETRONAS Perak Bandar Seri Iskandar Malaysia

It is a global ambition to realize sustainable development goals (SDGs) by 2030 following the aspiring climate change and pollution alleviation, and thus, the notion of sustainable biorefinery has emerged as an indispensable asset for worldwide sustenance and economy. Animal derived materials are biopolymers that are produced in nature during the life cycles of animals and usually considered as versatile, biocompatible, non-toxic, stable, and cheap feedstock with a promising closed-loop life cycles in the industrial ecology of future materials. Such materials could produce a severe hazard to the environment and its occupants if not ditched appropriately. Conversely, animal derived wastes are complex molecules in which manifold structure and heterogeneous networks of inter- and intra-molecular clutches endure unresolved challenges to sustainable processing and purification of these valuable waste matrices into biomaterials with numerous applications. Utilizing ionic liquids (ILs), which are environmentally safe and recyclable alternatives to organic solvents, greatly facilitates the handling and processing of biopolymers obtained from animals. ILs have been used progressively for the use of biopolymers. Compared to customary techniques, ILs assisted processing of animal-based biopolymers is superior as ILs are noncorrosive, possess extremely low vapor pressure, exhibit high thermal solidity and superb dissolution capabilities under relatively moderate conditions. Currently, a broad spectrum of various techniques has been studied to further tune up the proficiency of ILs processing of animal derived biopolymers for sustainable product development. The primary aim of this review is to illustrate the latest advancements in technology wherein the ILs leverages as processing media for animal-based biopolymers for the manufacturing of a plethora of sustainable materials have been progressively recognized. In addition to examining how various ILs serve as solvents, reagents

关键词： Sustainable development goals

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Numerical modelling of the hydrogen production from biomass and supercritical water and the scale-up criterion

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International Journal of Hydrogen Energy 2025年 139卷 11-24页

作者： Shaoli Ma Liuyimei Yang Yinghui Wu Qijun Zheng School of Rare Earths University of Science and Technology of China Hefei 230026 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou 341100 China ARC Research Hub for Smart Process Design and Control Department of Chemical and Biological Engineering Monash University Clayton Victoria 3800 Australia Department of Mechanical and Aerospace Engineering Monash University Clayton Vic 3800 Australia

The supercritical water fluidized bed is widely used for hydrogen production from gasified biomass. This paper utilizes a two-fluid model (TFM) to simulate the thermochemical process of biomass in the supercritical water fluidized bed, focusing on evaluating the validity of different scaling-up laws for the studied reactor. The H 2 yields of the glucose-xylose-guaiacol reaction system scaled up with the simplified dimensionless parameter set are 12.36 %, 13.57 %, and 24.27 % higher than those of the glucose reaction system scaled up with the simplified dimensionless parameter set, and 11.4 %, 13.88 % and 24.13 % higher than those of the glucose reaction system scaled up with the viscosity-limited dimensionless parameter set, respectively. For a supercritical water fluidized bed reactor, the dimensionless parameters < Re s , Fr = (u 0 ) 2 /(gL 0 ) , ρ s /ρ f , u 0 /u mf , L 1 /L 2 and Φ > are essential for scale-up of the reactor, particularly the gas-solid density ratio and solids Reynolds number. It is also demonstrated that the volumetric fraction of bubbles plays a significant role in enhancing the mass transfer between different phases and can effectively promote the H 2 yield by approximately 0.5 mol/kg. The turbulence intensity of the supercritical water exerts a mild influence on the H 2 yield.

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chemical mechanical polishing as an alternative surface treatment technique for corrosion prevention of carbon steel in an acidic medium

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Scientific Reports 2025年第1期15卷 1-11页

作者： Ahmed, Mohamed Ali Al-Timimi, Buthainah Al-Ali, Maha Abdullah, Ghassan H. Khalaf Atiyaha, Safa Yaseen Ali Aljanabi, Ahmed Mel, Maizirwan Mechanical Engineering Department College of Engineering Tikrit University Tikrit Iraq Chemical Engineering Department University of Technology-Iraq Baghdad Iraq Chemical Engineering and Sustainability Department Faculty of Engineering International Islamic University of Malasiya (IIUM) Kuala Lumpur Malaysia Oil and Gas Refining Engineering Department College of Petroleum Process Engineering Tikrit University Tikrit Iraq Petroleum Systems Control Engineering Department College of Petroleum Processes Engineering Tikrit University Tikrit Iraq Modeling and Design Program Atilim University Ankara Turkey

chemical mechanical polishing (CMP) has been a standard technique in semiconductor manufacturing for achieving smooth surfaces. CMP utilizes a synergistic interplay of chemical and mechanical interactions to achieve the desired removal rates, selectivity, and ultimately planarity with different substrate materials. In this study, the impact of CMP on the surface properties of steel used in the petroleum industry was examined, with a focus on its corrosion behavior posttreatment. Steel samples were subjected to CMP with and without an oxidizer in a silica-based slurry, and their surface characteristics were compared to those of samples polished mechanically. The addition of an oxidizer to the slurry resulted in increased material removal rates and the formation of an oxide layer on the surface;this phenomenon was not observed in CMP without an oxidizer. However, in mechanical polishing, the action of silicon carbide grains on the steel surface led to an increase in the removal rate but caused a decrease in its corrosion resistance. Compared with other treatments, the oxide layer provided a good protective barrier against corrosion and improved the corrosion resistance of the steel substrate. Based on the results from the practical study, an improvement in the corrosion resistance properties was observed due to the chemical reaction of the oxidizer and the mechanical action of the silica nanoparticles;these results showed the importance of chemical mechanical polishing as an alternative method to reduce the corrosion of steel in acidic environments. Additionally, the effect of hydrogen peroxide in a silica slurry with respect to the wettability, surface roughness, and hardness of steel was examined using contact angle measurements, profilometry, scanning electron microscopy, and microhardness tests. © The Author(s) 2025.

关键词： chemical mechanical polishing Contact angle Electrochemical corrosion test Hydrogen peroxide oxidizer Immersion test Material removal rate Silica-based slurry Surface roughness

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Modeling of Non-Catalytic Gas-Solid Reactions with Coupled Cfd-Dem- Uscm Method: A Case Study on Adsorption of Ammonia

SSRN

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SSRN 2025年

作者： Zarghami, Ameneh Moghaddas, Jafarsadegh Kazemi, Saman Mostoufi, Navid Saleh, Khashayar Chemical Engineering Department Sahand University of Technology P.O. Box 51335/1996 Tabriz Iran Process Design and Simulation Research Centre School of Chemical Engineering College of Engineering University of Tehran P.O. Box 11155/4563 Tehran Iran Sorbonne Universités Université de Technologie de Compiègne Transformations Intégrées de la Matière Renouvelable EA 4297 France

This study presents a novel approach for modeling the non-catalytic gas-solid reaction of adsorption of ammonia by metal ammine complexes. A coupled computational fluid dynamics-discrete element method-unreacted shrinking core model (CFD-DEM-USCM) is developed to simulate the behavior of an ammonia storage reactor. The model integrates both mesoscale gas dynamics and micro-scale particle interactions, allowing for a comprehensive analysis of the adsorption process. Validation of the model against experimental data demonstrated its accuracy in predicting the conversion. It was shown that the effective gas diffusivity of gas inside the particles greatly affects the overall conversion as well as the mean temperature of particles and gas. Higher diffusion rates enhance mass transfer, resulting in higher temperatures for both particles and gas. The change in particle size during the absorption of ammonia was investigated and its influence on the reactor void fraction was studied. Inspecting the change in the imposed pressure of the gas at the diffuser and reactor wall temperature indicated that increasing the pressure or decreasing the wall temperature enhances the conversion in the reactor. Estimation of force distribution among particles and between particles and the reactor wall indicated that increasing the particle size with conversion increases both forces. This study provides insight into efficient ammonia storage solutions, contributing to advancements in selective catalytic reduction technology for vehicle emissions control. © 2025, The Authors. All rights reserved.

关键词： Void fraction

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