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Synergistic thermal and surface area properties of Al₂O₃–TiO₂/water hybrid nanofluids

Case Studies in Chemical and Environmental engineering 2025年 11卷

作者： Djentoe, Yokanan Gustino Widiasto, Farrel Yoga Effendi, Hilbran Tama Dida Musabbikhah Hartati, Sri Santoso, Budi Kristiawan, Budi Wijayanta, Agung Tri Department of Mechanical Engineering Faculty of Engineering Universitas Sebelas Maret Jl. Ir. Sutami 36A Kentingan Surakarta 57126 Indonesia Master Program of Mechanical Engineering of Engineering Universitas Sebelas Maret Jl. Ir. Sutami 36A Kentingan Surakarta 57126 Indonesia Department of Mechanical Engineering Sekolah Tinggi Teknologi “Warga” Surakarta Jl. Raya Solo – Baki KM 2 Grogol Sukoharjo 57552 Indonesia Department of Agricultural Technology Universitas Veteran Bangun Nusantara Jl. Letnan Jenderal Sujono Humardani 1 Gadingan Jombor Bendosari Sukoharjo 57521 Indonesia Research Group of Sustainable Thermofluids Universitas Sebelas Maret Jl. Ir. Sutami 36A Kentingan Surakarta 57126 Indonesia

This work investigated experimentally on synergistic thermal and surface area properties of water-based Al2O3–TiO2 hybrid nanoparticles at a given volume ratio (50:50). Morphology and structure characterization were ... 详细信息

This work investigated experimentally on synergistic thermal and surface area properties of water-based Al₂O₃–TiO₂ hybrid nanoparticles at a given volume ratio (50:50). Morphology and structure characterization were performed using Transmission Electron Microscope (TEM) and Surface Area Analysis (SAA), while thermal properties were analyzed using a thermal properties analyzer. The aims of this study were to investigate morphology and structure characterization and to evaluate thermal behavior using Transient Line Heat Source (TLHS), including thermal conductivity, heat capacity, and diffusivity. TEM micrographs revealed that TiO₂ and Al₂O₃ nanoparticles were characterized by fractal-like arrangements and quasi-spherical morphology, respectively. The structural analysis of TiO₂ and Al₂O₃ nanoparticles reveals a mesoporous structure with curve isotherm type IV that has loop hysteresis characteristics. The thermal durability of the water-based Al₂O₃–TiO₂ hybrid nanoparticles is shown to have a strong relationship with the Moldoveanu model, confirming the trend of increasing thermal durability with a decrease in temperature as a result of increased nanoparticle mobility. According to this study, thermal behavior indicates that there are differences in temperature between 20 and 65 °C. Heat capacity increases significantly from 4 to 8 MJ/m²·K, with the fastest change occurring between 20 and 30 °C, whereas thermal diffusivity is bounded between 0 and 0.2 mm²/s. All of this highlights the potential applications in analysis and energy storage, highlighting the transfer characteristics of nanomaterials that are useful. The potential of hybrid nanofluids in long-term thermal management systems is demonstrated in this case study. © 2025 The Authors

关键词： Hybrid nanofluid Specific heat Thermal conductivity Thermal property

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Techno-economic analysis of green hydrogen production by a floating solar photovoltaic system for industrial decarbonization

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Clean Energy 2024年第4期8卷 1-14页

作者： Rahma Muthia Anastasia Segari Putri Pramudya Mochamad Rafly Maulana Widodo Wahyu Purwanto Department of Chemical Engineering Faculty of EngineeringUniversitas IndonesiaDepok16424Indonesia Sustainable Energy Systems and Policy Research Cluster Universitas IndonesiaDepok16424Indonesia Master Program in Energy Systems Engineering Faculty of EngineeringUniversitas IndonesiaDepok16424Indonesia

This study proposes a conceptual design of green hydrogen production via proton exchange membrane electrolysis powered by a floating solar photovoltaic *** system contributes to industrial decarbonization in which hydrogen blending with natural gas is proposed as an approach to smooth the energy *** proposed design addresses the challenge of supplying a continuous flow-rate of green hydrogen,which is typically demanded by industrial end *** study particularly considers a realistic area required for the installation of a floating solar photovoltaic *** enable the green hydrogen production of 7.5 million standard cubic feet per day,the required structure includes the floating solar photovoltaic system and Li-ion batteries with the nominal capacities of 518.4 megawatts and 780.8 *** is equivalent to the requirement for 1524765 photovoltaic modules and 3718 Li-ion *** assessment confirms the technical viability of the proposed concept of green hydrogen production,transportation and *** the present commercialization is hindered by economics due to a high green hydrogen production cost of USD 26.95 per kg,this green hydrogen pathway is expected to be competitive with grey hydrogen produced via coal gasification and via natural gas steam reforming by 2043 and 2047,respectively.

关键词： floating solar photovoltaics gas blending green hydrogen industrial decarbonization lithium-ion battery photon exchange membrane electrolysis

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Techno-economic analysis of a hybrid renewable energy system integrated with productive activities in an underdeveloped rural region of eastern Indonesia

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Clean Energy 2023年第6期7卷 1247-1267页

作者： Alya Nurul Shafira Subhan Petrana Rahma Muthia Widodo Wahyu Purwanto Sustainable Energy Systems and Policy Research Cluster Universitas IndonesiaDepok16424Indonesia Chemical Engineering Department Faculty of EngineeringUniversitas IndonesiaDepok16424Indonesia Master Program in Energy Systems Engineering Faculty of EngineeringUniversitas IndonesiaDepok16424Indonesia

The Southwest Maluku region in eastern Indonesia is considered a frontier,outermost and underdeveloped *** inhabitants live on isolated islands,including the residents of Mahaleta Village,where only 9.4%of the community have limited access to *** study aimed to design an economically feasible hybrid renewable energy(RE)system based on solar and wind energy to integrate with the productive activities of the *** study developed conceptual schemes to meet the demand for electricity from the resi-dential,community,commercial and productive sectors of the *** analysis was performed using a techno-economic *** hybrid system was designed using the HOMER Pro optimization function,and cold-storage and dryer systems were designed to support related productive *** optimized design of the hybrid RE system comprised 271.62 kW of solar photovoltaics,80 kW of wind turbines and a 1-MWh lead-acid *** found that the hybrid RE system would only be economically feasible with a full-grant incentive and an electricity tariff of$0.0808/***,the productive activity schemes were all economically feasible,with a cold-storage cost of$0.035/kg and a drying cost of$0.082/*** the hybrid RE system with productive activities can improve the economic feasibility of the energy system and create more jobs as well as increase income for the local community.

关键词： underdeveloped region hybrid renewable energy system photovoltaics wind turbine Indonesia

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Accelerating progress on the SDGs: Policy guidance from the global modeling literature

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One Earth 2025年

作者： Cameron Allen Shirin Malekpour Åsa Persson Therese Bennich Monash Sustainable Development Institute Monash University Melbourne VIC Australia Sustainability Assessment Program School of Civil and Environmental Engineering UNSW Sydney Sydney NSW 2052 Australia Stockholm Environment Institute Stockholm Sweden

There is an urgent need to accelerate progress if the world is to achieve the UN sustainable Development Goals (SDGs) by 2030. Global research has identified six transformation entry points as imperative for SDG achievement: well-being, the economy, and food, energy, urban, and environmental systems. Policymakers require evidence on transformative policies to accelerate progress across these entry points. Here, we present evidence on SDG policies from a scoping review of the global modeling literature. We find that policies have been modeled for all six entry points. Most studies model single entry points and have less coverage of urban systems and five of the SDGs. Initial quantitative estimates of policy ambition and costs and policy interactions are available but remain limited and challenging to compare. Future SDG modeling research to inform policy could emphasize modeling multiple entry points and policy interactions as well as policy standardization.

关键词： sustainable Development Goals SDGs scenarios modeling transformations transitions pathways policy interlinkages acceleration

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A parametric review of the built environment sustainability literature

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International Journal of Environmental Technology and Management 2002年第1-3期2卷 54-93页

作者： Pearce, Annie R. Vanegas, Jorge A. Sustainable Facilities and Infrastructure Program Georgia Tech. Research Institute Atlanta GA 30332-0837 United States Construction Engineering and Management Program School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta GA 30332-0355 United States

The literature on built environment sustainability has grown dramatically in the past 10 years. Despite the proliferation of literature, there is still no consensus on how comprehensively and uniformly to define the concept of sustainability as it pertains to the built environment, nor is there consensus on what aspects of the built environment should be considered in evaluating the sustainability of a built facility. This paper, through an evaluation of selected sources from the sustainability literature, takes a first step in systematically identifying what parameters of both the built environment and the concept of sustainability are emphasised in the existing literature on the topic. The outcome is a set of parameters that can be used in future research to begin uniformly and comprehensively to define sustainability as it applies to built facilities, using techniques such as concept mapping, content analysis, dendograms, and other established research methods. Copyright © 2002 Inderscience Enterprises Ltd.

关键词： sustainable development

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Defining sustainability for built environment systems: An operational framework

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International Journal of Environmental Technology and Management 2002年第1-3期2卷 94-113页

One of the ongoing challenges in the quest to make our built environment more sustainable is defining what sustainability means in terms understandable to and measurable by built environment decision makers. This paper illustrates one approach to developing a comprehensive and exhaustive definition of sustainability for the built environment: deriving domain-specific variables from fundamental principles and constraints that govern how earth systems work. The paper uses the concept of systems to define characteristics and critical constraints of both the earth as a whole and built facilities in particular. These constraints provide a basis for identifying conditions which must be met in order for a built facility system to be sustainable. The contribution of the paper is a decision space based on required sustainability conditions that can be used to evaluate facility alternatives in terms of their relative sustainability. Copyright © 2002 Inderscience Enterprises Ltd.

关键词： sustainable development

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Custom birth pack comparison: An LCA perspective on healthcare 3

Custom birth pack comparison: An LCA perspective on healthca...

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3rd International Congress on Sustainability Science and engineering, ICOSSE 2013

作者： Campion, Nicole Bilec, Melissa Copley-Woods, Noe Department Sustainable and Green Design Program University of Pittsburgh Civil and Environmental Engineering United States

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Exploring the limits to sustainable energy consumption for organisms and devices

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International Journal of sustainable Manufacturing 2008年第1-2期1卷 78-99页

作者： Reap, John Bras, Bert Sustainable Design and Manufacturing Program Systems Realisation Laboratory George W. Woodruff School of Mechanical Engineering Atlanta GA 30332-0405 United States

Energy consumption accounts for a significant portion of a product's environmental impacts. Biological research suggests the existence of a fundamental energetic limit. After reviewing research into the influence of thermodynamic and economic principles on living systems' evolution, a biological principle explaining the existence of a mass-specific energy consumption rate limit for living systems is identified and quantified. These findings lead to a potential sustainable engineering principle and metric. Simple assessments of consumer goods and vehicles illustrate the principle's application. Discussions of this biologically inspired limit and the general value of seeking environmental design guidance from living systems close this paper. Copyright © 2008 Inderscience Enterprises Ltd.

关键词： Energy utilization

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Comparative study of mixing liquids and powders in a continuous medium using CFD

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Journal of engineering Science and Technology Review 2018年第5期11卷 134-138页

作者： Enamorado, Alberto Mario Fuentes Betancourt, Juan Bernardo Restrepo Obregon, Luis Guillermo Research Group in Process Simulation and Coal Transformation Chemical Engineering Program Universidad del Atlántico Barranquilla Colombia Research Group on Sustainable Chemical and Biochemical Processes Chemical Engineering Program Universidad del Atlántico Barranquilla Colombia

Prediction of flow and mixing of powders is a difficult challenge that has not been solved yet. Different numerical methods have been used to find the solution to the mathematical models proposed, but there are no experiments to compare and validate the results. The method with the best approximation is the discrete element method (DEM). However, this method requires a high computational power. In this article, it was made a comparison between the experimental results obtained when mixing two powders in an oscillatory low shear mixing device, and the 3D simulation of the same equipment using liquids with the help of a commercial software of computational fluids dynamics, CFD. Experiments at different wall velocities and wall displacements were run. Results reveal that the mixing in solids and liquids present lots of similarities when working at low velocity. This velocity lets solids to stay in frictional regime and liquids in the laminar regime. A zone of no mixing at the bottom of the mixing cavity is presented in liquids which is similar to the triangular pattern of no mixing found in solids. The height of the no mixing zone depends on the time of mixing, and the displacement and velocity of the walls. Under laminar regime conditions, the Navier Stokes equations can be applied to the powders because the velocity profiles obtained are similar. © 2018 Eastern Macedonia and Thrace Institute of Technology.

关键词： Shear stress

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Fabrication of graphene oxide decorated with poly(dimethyl amino ethyl methacrylate) brush for efficient Cr(Ⅵ) adsorption from aqueous solution

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Chinese Journal of Chemical engineering 2024年第9期73卷 51-61页

作者： Alireza Nouri Siew Fen Chua Ebrahim Mahmoudi Abdul Wahab Mohammad Wei Lun Ang Department of Chemical and Process Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangi 43600Malaysia Centre for Sustainable Process Technology(CESPRO) Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangi 43600Malaysia Chemical and Water Desalination Engineering Program College of EngineeringUniversity of SharjahSharjah 27272United Arab Emirates

Confronting the severe health threats and environmental impacts of Cr(Ⅵ) in aquatic environments demands innovative and effective remediation approaches. In this study, Graphene oxide(GO)-decorated poly(dimethyl amino ethyl methacrylate)(PDMAEMA) brush nanocomposites(GOP1, GOP2, GOP3, and GOP4) were fabricated using atom transfer radical polymerization(ATRP) by the “graft from” *** resulting nanocomposites were utilized for removing Cr(Ⅵ) with good adsorption performance due to the electrostatic interaction of protonated nitrogen groups in the brush chains with negatively charged particles in the solution. The kinetic model of pseudo-second-order best represented the contaminants' adsorption characteristics. The Weber-Morris model further indicated that surface adsorption and intraparticle diffusion mechanisms primarily controlled the adsorption procedure. Additionally, the Langmuir and Temkin isotherm models were found to most accurately represent the adsorption characteristics of the pollutants on the nanocomposites, and GOP4 can achieve the maximum adsorption capacity of 164.4 mg·g^(-1). The adsorbents' capacity maintains above 85% after five cycles of adsorption-desorption. The nanocomposites in this study demonstrate promising potential for eliminating Cr(Ⅵ) from aqueous solutions.

关键词： Graphene oxide PDMAEMA brush Polymerization Nanoparticles Adsorption Chromium

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