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An enhanced efficacy of antibacterial wound dressings impregnated with bacterial cellulose-based microencapsulated lime ( Citrus aurantiifolia ) essential oil

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Carbohydrate Polymer Technologies and Applications 2025年 10卷

作者： Euis Julaeha Irene Febbe Myrtha Karina Tatang Wahyudi Sarifah Nurjanah Pramesthi Reitza Navisya Vasall Nandang Permadi Jamaludin Al-Anshori Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Padjadjaran Jatinangor 45361 Indonesia Research Center for Environmental and Clean Technology National Research and Innovation Agency Cibinong Bogor 16911 Indonesia Research Center for Biomass and Bioproduct National Research and Innovation Agency Cibinong Bogor 16911 Indonesia Research Collaboration Center for Nanocellulose BRIN – Universitas Andalas Padang 25163 Indonesia Research Collaboration Center for Biomass and Biorefinery BRIN – Universitas Padjadjaran Jatinangor 45363 Indonesia Research Center for Advanced Materials National Research and Innovation Agency Tangerang Selatan 15310 Indonesia Department of Agriculture Engineering Faculty of Agricultural Industrial Technology Universitas Padjadjaran Jatinangor 45363 Indonesia Master’s Program in Biotechnology Graduate School Universitas Padjadjaran Bandung 40132 Indonesia Doctorate Program in Biotechnology Graduate School Universitas Padjadjaran Bandung 40132 Indonesia

Lime peel essential oil (LPO) exhibits promising antibacterial properties, yet its inherent instability limits its practical applications, necessitating effective encapsulation strategies. Microencapsulation provides protection and facilitates the controlled release of active compounds. This study developed LPO microcapsules via complex coacervation, employing gum arabic and gelatin as encapsulating agents for wound dressing applications. Process optimization identified optimal conditions at pH 4.25, 15 min stirring time, and 50 °C temperature. The microcapsules yielded 45.13 %, oil content 77.03 %, encapsulation efficiency 92.14 %, and a 44.94 % core release within 2 h, following the Avrami kinetic model ( n = 0.345). Morphological analysis revealed spherical microcapsules with an average diameter of 1.182 μm, effectively protecting LPO from thermal degradation. These microcapsules were subsequently immobilized onto bacterial cellulose produced from pineapple core fermentation using Komagataeibacter xylinus . The resulting material demonstrated potential as an antibacterial wound dressing, with inhibition zones of 11.51 mm against Staphylococcus aureus and 13.70 mm against Escherichia coli . This research presents an innovative approach to wound dressing development, integrating protective and antibacterial functions to prevent skin infection effectively.

关键词： Antibacterial Bacterial cellulose Complex coacervation C. aurantiifolia Microencapsulation

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A preliminary investigation of polymer modified hydrated cement paste prisms and the fracture analysis of tested specimens

A preliminary investigation of polymer modified hydrated cem...

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ACI Spring 2010 Convention

作者： Belkowitz, J. Best, M. Nilsen, M. Fisher, F. Armentrout, D. Stevens Institute of Technology United States Ninyo and Moore Geotechnical and Environmental Consultants Denver CO United States Civil Engineering Technology Program Metro State College Denver United States Lafarge's Western US Region Denver CO United States Department of Mechanical Engineering Stevens Institute of Technology United States Nanotechnology Graduate Program Stevens Institute of Technology United States Department of Mechanical and Materials Engineering University of Denver United States

ISBN: (纸本)9781618392060

The following paper documents the preliminary experimentation and analysis of a polymer fortified hydrated cement sample. Concrete is a brittle construction material. When compared to other construction materials, concrete can offer competitive structural resistance under compressive loads. But due to the brittle nature of the hydrated cement matrix, C-S-H network, concrete is poor when resisting flexural loads. The brittle C-S-H structures cannot absorb the flexural energy like a ductile material. The properties of concrete fracture are analyzed at the microscopic level to understand the method of failure. By including the acrylic polymer into the hydrated specimens it was the belief of the authors that the acrylic polymer would enhance the fracture behaviour of the concrete in flexure. The C-S-H hydrates precipitate from a saturated solution. The acrylic polymer, after being mixed into the cement paste while still fresh, becomes secured in the C-S-H structure as said structure hardens. Samples were cast, cured, and tested in order to determine if the acrylic polymer cause the C-S-H structure to behave in a ductile manner. The testing included compressive and flexural stress tests with microstructure observation via Scanning Electron Microscope (SEM). The compressive and flexural tests were used to discern a measured value of gain when using an acrylic polymer compared to a control mix. The SEM images were used to determine crack origin, type of failure, and acrylic polymer benefit. The tests and SEM images revealed that there was a negative reaction between the admixtures to cause an excessive air generation. Despite the setback, the SEM images revealed evidence of energy absorbing of the acrylic polymer mix.

关键词： Scanning electron microscopy

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FIELD TRAPPING OF SUBSURFACE VAPOR-PHASE PETROLEUM-HYDROCARBONS

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GROUND WATER MONITORING AND REMEDIATION 1994年第1期14卷 110-119页

作者： MOYER, EE OSTENDORF, DW KAMPBELL, DH XIE, YF Ellen E. Moyer (ENSR Consulting and Engineering 35 Nagog Park Acton MA 01720) is a senior environmental engineer at ENSR Consulting and Engineering in Acton Massachusetts. Her research interests include bioremediation air sparging soil venting and analytical modeling of subsurface contamination. Moyer is a registered Professional Engineer with an M.S. in environmental engineering and a Ph.D. in civil engineering from the University of Massachusetts at Amherst and a member of the National Ground Water Association and the American Society of Civil Engineers. David W. Ostendorf (Civil Engineering Department University of Massachusetts Amherst MA 01003) is an associate professor in the environmental engineering program of the Civil Engineering Department of the University of Massachusetts at Amherst. His research interests include unconfined aquifer contamination hazardous waste site remediation and analytical modeling of problems in environmental fluid mechanics. Ostendorf is a registered Professional Engineer and a member of the American Geophysical Union American Society of Civil Engineers Soil Science Society of America Water Pollution Control Federation and Association of Environmental Engineering Professors as well as the National Ground Water Association. Don H. Kampbell (Robert S. Kerr Environmental Research Laboratory Ada OK 74820) is a research chemist at the U.S. EPA Robert S. Kerr Environmental Research Laboratory in Ada Oklahoma. His research interests include gas chromatog- raphy GC/mass spectrometry industrial waste processes soil bioreactor systems aquifer biorestoration and soil gas measurements. Kampbell is a certified Professional Soil Scientist and a registered Professional Engineer as well as a member of the Soil Science Society of America and the American Chemical Society. Yuefeng Xie (Civil Engineering Department University of Massachusetts Amherst MA 01003) is a postdoctoral research associate in the environmental engineering program of the Civil Engineering Depart

Soil gas samples from intact soil cores were collected on adsorbents at a field site, then thermally desorbed and analyzed by laboratory gas chromatography (GC). Vertical concentration profiles of predominant vapor phase petroleum hydrocarbons under ambient conditions were obtained for the zone directly above the capillary fringe. Water and residual phase weathered aviation gasoline were present in this region of the profile. The sampling, trapping, and GC methodology was effective in most respects. Reproducibility, trapping, and desorption efficiency were generally satisfactory, and different sorbent tubes gave similar results. A minor shortcoming of the method occurred with the most volatile compound, 2,3-dimethylbutane, which was poorly retained during several weeks of storage time and was also poorly desorbed. Vapor phase concentrations of predominant hydrocarbon compounds all increased with depth at one sampling location. At a more highly contaminated location, concentrations of highly volatile compounds increased with depth while concentrations of less volatile compounds remained constant or decreased, possibly indicating distillation effects. Scatter in the data was attributed to heterogeneities in water and residual phase distribution.

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Model Predictions for New Iron Ore Sintering Process Technology Based on Biomass and Gaseous Fuels

Model Predictions for New Iron Ore Sintering Process Technol...

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2014 3rd International Conference on Micro Nano Devices,Structure and Computing Systems(MNDSCS 2014)

作者： Jose Adilson de Castro Federal Fluminense University-Graduate Program on Mechanical Engineering-Volta Redonda Environmental Metallurgy Laboratory (IML) Graduate Institute of Ferrous Technology (GIFT)-Pohang University of Science and Technology

In this paper a new technology for a compact iron ore sintering machine is *** compact sintering process is based on the massive injection of gaseous fuels and the solid fuel is only agglomerated fine charcoal obtained by *** solid fuel used in this study is obtained by agglomeration of fine charcoal produced from elephant glass which has very short period for production and CO capture（less than 6 months in tropical climate）.To overcome the lower heat supply into the combustion front of the sintering process the simultaneous injection of oxygen and gaseous fuel is *** proposed methodology is to combine the solid fuel（agglomerated fines charcoal） and steelworks gases in a compact machine to enhance heat and mass transfer with high productivity（about 5 times the conventional large machine）.A multiphase mathematical model based on transport equations of momentum,energy and chemical species coupled with chemical reaction rates and phase transformations is used to analyze the inner process parameters.A base case representing a possible actual industrial operation of the sintering machine is used in order to compare different scenarios of practicable operations which represents advanced operations *** model was used to predict six cases of combined operation with biomass and fuel gas utilization:a)Scenario 01 and 02:Wind boxes inflow from N01-N10 of rich mixture of natural gas（NG） +Air+O,b) Scenario 03 and 04:Wind boxes inflow from N01-N10 of rich mixture of coke oven gas（COG）+Air +O,c) Scenario 05 and 06:Wind boxes inflow from N01-N10 of mixture of COG+BFG+Air+*** model predictions indicated that for all cases,the sintering zone is enlarged and the solid fuel consumption is *** order to maximize the steelworks gas utilization it is recommended the use of mixture of COG and BFG with optimum inner temperature distribution within a compact sintering machine（in this study was the scenario 05）,which enhance the productivity keep

关键词： Sintering process Multiphase modeling Gaseous fuels Biomass

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Photocatalytic degradation of perfluorooctane sulfonic acid and perfluorooctanoic acid using titanium dioxide/graphene oxide nanocomposite immobilized on polyvinyl alcohol film

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Case Studies in Chemical and environmental engineering 2024年 10卷

作者： Boonchata, Putthicha Boontanon, Narin Jindal, Vinod Aung, Humm Kham Zan Zan Visvanathan, Chettiyappan Fujii, Shigeo Boontanon, Suwanna Kitpati Graduate Program in Environmental and Water Resources Engineering Department of Civil and Environmental Engineering Faculty of Engineering Mahidol University Research Center and Technology Development for Environmental Innovation Faculty of Environment and Resource Studies Mahidol University Department of Chemical Engineering Faculty of Engineering Mahidol University Graduate School of Global Environmental Studies Kyoto University

In full-scale units, the real application of nanoparticles photocatalytic degradation is still challenging due to the requirement of post separation for recovery of fine particles. This work investigated the removal efficiencies of perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) using titanium dioxide (TiO₂) nanoparticles coupling with graphene oxide (GO) sheets immobilized in polyvinyl alcohol (PVA) matrix via solution-casting and a heat-treatment process to achieve the TiO₂/GO/PVA nanocomposite film as a photocatalyst. The operative parameters were focused on initial solution pH value, GO concentration, and heat-treatment time, which subsequently determined the optimal indices for the catalyst film. The structure characterization of the Ti–O–C bond indicated that a strong interaction between GO and TiO₂ had been formed at the hydrolysis process while TiO₂/GO nanoparticles were chemically embedded in PVA matrix by the heat-treatment method. The photocatalytic degradation of PFOS and PFOA produced a nanocomposite film with 25 wt% TiO₂/GO that was treated at 120 °C for 3 h and exhibited a remarkable removal activity in acidic solution with a pH of 3. This condition efficiently degraded PFOS and PFOA by approximately 95.99 % and 96.89 %, respectively, through a photocatalytic reaction. This research presents a straightforward method to synthesize TiO₂/GO/PVA catalyst that influences persistent organic pollutants (POPs) under ultraviolet irradiation, which is of practical significance for environmental applications. © 2024 The Authors

关键词： Graphene oxide PFOA PFOS Photocatalytic Polyvinyl alcohol Titanium dioxide

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Production of 5-hydroxymethylfurfural from fructose via inherent catalytic properties of a biphasic system without external catalyst addition

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Green Chemistry 2023年第3期26卷 1533-1541页

作者： Huynh, Quang Tam Padilla, Alexander F. de Luna, Mark Daniel G. Huang, Po-Jung Chen, Pei-Shih Saidina Amin, Nor Aishah Chen, Ku-Fan Chang, Ken-Lin Institute of Environmental Engineering National Sun Yat-Sen University Kaohsiung804 Taiwan Energy Engineering Program National Graduate School of Engineering University of the Philippines Diliman Quezon City1101 Philippines Department of Chemical and Materials Engineering National Central University Taoyuan320317 Taiwan Department of Public Health College of Health Sciences Kaohsiung Medical University Kaohsiung Taiwan Johor Bahru Skudai81310 Malaysia Department of Civil Engineering National Chi Nan University Nantou545 Taiwan Net Zero Emissions and Resource Recycling Technology Research Center National Sun Yat-Sen University Kaohsiung804 Taiwan

5-Hydroxymethylfurfural (5-HMF) is the key to unlocking the potential of biomass materials to transform into fuels, materials, and chemicals. In this study, an effective biphasic reaction system composed of a reaction phase (aqueous phase) and an extraction phase (organic phase) was used for the conversion of fructose to 5-HMF. Deep eutectic solvents (DESs) composed of different hydrogen bond donors and hydrogen bond acceptors, the ionic liquid [BMIM]Cl, aqueous choline chloride, aqueous betaine hydrochloride, and ethylamine hydrochloride were used as the reaction phase, and different organic solvents, such as methyl isobutyl ketone (MIBK), dimethyl sulfoxide (DMSO), toluene, ethyl butyrate, and gamma-valerolactone (GVL), were used as the organic phase. Experiments were conducted under optimal conditions simulated using the reaction surface method to obtain the maximum 5-HMF yield. The highest yields of 5-HMF obtained in reactions with DESs were 67.86%, 68.69%, and 71.40% for ChCl : OA, ChCl : Lac, and EaCl : Lac, respectively. However, adding dimethyl sulfoxide and betaine hydrochloride aqueous solution to the fructose conversion system resulted in a maximum yield of 90.42% ± 1.46% of 5-HMF without the use of catalysts. This study also demonstrated that betaine hydrochloride could be effectively reused four times. A 5-HMF yield of at least 80% indicates a green process suited towards sustainable development. © 2024 The Royal Society of Chemistry.

关键词： Fructose

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Simulation of multilayer shallow water fluid flow using lattice boltzmann modeling and high performance computing

Simulation of multilayer shallow water fluid flow using latt...

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World environmental and Water Resources Congress 2009: Great Rivers

作者： Tubbs, K.R. Tsai, F.T.-C. Donald W. Clayton Graduate Program in Engineering Science Louisiana State University 351 Johnston Hall Baton Rouge LA 70803 United States Department of Civil and Environmental Engineering Louisiana State University 3418G Patrick F. Taylor Hall Baton Rouge LA 70803-6405 United States

ISBN: (纸本)9780784410363

A lattice Boltzmann method (LBM) on high performance computing (HPC) environments for three-dimensional shallow water flow fields is developed. Recently, the LBM has become an attractive numerical method to solve various fluid dynamics phenomena. However, LBM has not been extensively applied to shallow water equations. The shallow water equations have wide applications in ocean and hydraulic engineering which can benefit from the advantages of the LBM. The standard LBM for two dimensional shallow water flows is extended to three dimensional flows by solving the multilayer shallow water equations. LBM is an attractive method for solving the multilayered shallow water equations because the extension to a multilayer formulation is straight forward and all simplicities and advantages of the LBM are retained. The performance of the LBM for the multilayer shallow water equations is investigated and optimized in HPC environments. We numerically demonstrate the applicability of the LBM in three dimensional shallow water flows and the LBM performance using OpenMP. © 2009 ASCE.

关键词： Multilayers

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Simultaneous monitoring tumor vascular and tissue oxygen tension under hyperbaric oxygen exposure

Simultaneous monitoring tumor vascular and tissue oxygen ten...

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Biomedical Topical Meeting, BIO 2006

作者： Xia, Mengna Liu, Hanli Ren, Ya Mason, Ralph Levine, Benjamin Biomedical Engineering Graduate Program University of Texas at Arlington Arlington TX 76013 United States Department of Radiology UT Southwestern Medical Center at Dallas Dallas TX United States Institute of Exercise and Environmental medicine UT Southwestern Medical Center at Dallas Dallas TX United States

We demonstrate the ability to simultaneously investigate breast tumor oxygen dynamics by Steady-state diffuse reflectance spectroscopy and FOXY oxygen sensor in response to hyperbaric oxygen intervention. © 2006 ...

ISBN: (纸本)1557528071

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Budget-constrained rail network electrification problem

arXiv

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arXiv 2021年

作者： Patil, Priyadarshan N. Walthall, Rydell Boyles, Stephen D. Graduate Program in Operations Research and Industrial Engineering The University of Texas Austin United States Department of Civil Architectural and Environmental Engineering The University of Texas Austin United States

We consider a budget constrained rail network electrification problem with associated changes in costs of energy usage (via path gradient and curvature), operations, and long-term maintenance. In particular, we consider that freight flows on such a network form a user equilibrium. Interactions between electric and diesel trains on the same corridor are represented with nonseparable link performance functions, which nevertheless have a symmetric Jacobian. This bi-level formulation is solved for the North American railroad network using a genetic algorithm (GA), incorporating domain-specific insights to reduce the number of solutions which must be considered. We analyze solution characteristics and decision-making implications. Results show that broad connectivity would be beneficial for most impact. Increasing demand shifts electrified corridors towards the more populous east and gulf coasts, while increased operational costs results in electrification of routes through mountainous terrains. © 2021, CC BY.

关键词： Electric utilities

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Kinetic Behaviors and Nitrite Accumulation of Thiosulfate Autotrophic Denitrification Process

SSRN

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SSRN 2024年

作者： Chang, Jenting Septiariva, Iva Yenis Yang, Youren Chuang, Shun-Hsing Graduate Institute of Environmental Engineering National Central University Taoyuan City32001 Taiwan Civil Engineering Study Program Sebelas Maret University Surakarta57126 Indonesia

Exploration of the effects of different S/N ratios on the accumulation of NO2-N in the autotrophic denitrification process is crucial due to no need for an external organic carbon supply. Herein, thiosulfate-driven autotrophic denitrification (SADN) was established in a sequencing batch reactor treating nitrate-containing wastewater. The long-term and batch tests observed that when sufficient thiosulfate was present, the branched thiosulfate oxidation (BTO) reaction occured. Therefore, the sulfur-to-nitrogen (S/N) molar ratio had to be maintained over 2.19 to provide enough electron donors for complete denitrification with SNaRR of 13.13 mg NO3-N/g ***. If the S/N molar ratio declined to 1.75, some nitrite accumulation would utilize the stored elemental sulfur. SNiRR increased from 0.4 – 20.1 mg NO2-N/g *** when the S/N ratio rose from 1.46 to 4.38. Under a sufficient S/N ratio, the change in nitrogen concentration followed a zero order reaction. The microbial analysis identified Desulfobacterota as key microbes, with autotrophic denitrifying bacteria accounting for more than 70%. © 2024, The Authors. All rights reserved.

关键词： Denitrification

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