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2022

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Articles 451 - 480 of 657

Full-Text Articles in Chemical Engineering

Flow Regimes In Gas-Solid Fluidized Beds Via Micro-Foil Heat Flux Sensor, Haidar Taofeeq, Sebastián Uribe, Muthanna H. Al-Dahhan Feb 2022

Flow Regimes In Gas-Solid Fluidized Beds Via Micro-Foil Heat Flux Sensor, Haidar Taofeeq, Sebastián Uribe, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

The flow regime transitions in a gas-solid fluidized bed were studied for the first time using a micro-foil heat flux sensor. The time series of heat flux signals was analyzed by statistical and state space methods. The experimental measurements were performed in a lab-scale gas-solid fluidization column. Four different flow regimes, i.e., fixed-bed flow regime, bubbling-flow regime, slugging-flow regime, and turbulent-flow regime, and three intermediate transition velocities, i.e., minimum fluidizing velocity or minimum bubbling velocity, minimum slugging velocity, and minimum turbulent velocity, were successfully identified. The method based on the analysis of heat flux sensor measurements allowed to determine accurately …

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Heterogeneous Biodiesel Catalyst From Steel Slag Resulting From An Electric Arc Furnace, Mai H. Roushdy Feb 2022

Heterogeneous Biodiesel Catalyst From Steel Slag Resulting From An Electric Arc Furnace, Mai H. Roushdy

Chemical Engineering

Biodiesel is one of the most environmentally friendly and renewable fuels, as it is a non-polluting fuel and is made from living resources, such as vegetable oils. The steel industry generates a variety of solid wastes, including electric arc furnace slag (EAFS). The synthesis of biodiesel from waste sunflower cooking oil was examined in this study, utilizing EAFS as a catalyst, which mainly contains ferric and ferrous oxides, calcium oxide, and silica. To evaluate their impact on biodiesel production, four independent variables were chosen: temperature (50–70 ◦C), catalyst loading (1–5%), methanol-to-oil (M:O) molar ratio (5–20), and time (1–4 h). The …

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Concentration Polarization Controlin Stand-Alone And Hybrid Forward Osmosis Systems: Recent Technological Advancements And Future Directions, W. Suwaileh, Masoumeh Zargar, A. Abdala, F. A. Siddiqui, Mehdi Khiadani, A. Abdel-Wahab Feb 2022

Concentration Polarization Controlin Stand-Alone And Hybrid Forward Osmosis Systems: Recent Technological Advancements And Future Directions, W. Suwaileh, Masoumeh Zargar, A. Abdala, F. A. Siddiqui, Mehdi Khiadani, A. Abdel-Wahab

Research outputs 2022 to 2026

Forward osmosis (FO) has received significant attention recently. FO has high potentials for integration with other water treatment technologies. However, concentration polarization (CP) remains a significant challenge in FO membrane applications. In particular, internal CP (ICP) reduces the permeability of FO membranes by nearly 80%. The development of FO processes and their applications can greatly benefit from strategies that detect and control CP in standalone and integrated FO systems. This requires consideration of FO membrane structures, materials, configurations, operating conditions, and modification and cleaning strategies. This review provides a state-of-the-art analysis of recent literature on CP detection and control with …

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Experimental Evaluation Of Liquid Nitrogen Fracturing On The Development Of Tight Gas Carbonate Rocks In The Lower Indus Basin, Pakistan, Muhammad Ali, Abdul Majeed Shar, Aftab Ahmed Mahesar, Ahmed Al-Yaseri, Nurudeen Yekeen, Khalil Rehman Memon, Alireza Keshavarz, Hussein Hoteit Feb 2022

Experimental Evaluation Of Liquid Nitrogen Fracturing On The Development Of Tight Gas Carbonate Rocks In The Lower Indus Basin, Pakistan, Muhammad Ali, Abdul Majeed Shar, Aftab Ahmed Mahesar, Ahmed Al-Yaseri, Nurudeen Yekeen, Khalil Rehman Memon, Alireza Keshavarz, Hussein Hoteit

Research outputs 2022 to 2026

Tight gas carbonate formations have enormous potential to meet the supply and demand of the ever-growing population. However, it is impossible to produce from these formations due to the reduced permeability and lower marginal porosity. Several methods have been used to extract unconventional tight gas from these reservoirs, including hydraulic fracturing and acidizing. However, field studies have demonstrated that these methods have environmental flaws and technical problems. Liquid nitrogen (LN2) fracturing is an effective stimulation technique that provides sudden thermal stress in the rock matrix, creating vivid fractures and improving the petro-physical potential. In this study, we acquired …

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Asphaltene Thermodynamic Precipitation During Miscible Nitrogen Gas Injection, Mukhtar Elturki, Abdulmohsin Imqam Feb 2022

Asphaltene Thermodynamic Precipitation During Miscible Nitrogen Gas Injection, Mukhtar Elturki, Abdulmohsin Imqam

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

For many years, miscible gas injection has been the most beneficial enhanced oil recovery method in the oil and gas industry. However, injecting a miscible gas to displace oil often causes the flocculation and deposition of asphaltenes, which subsequently leads to a number of production problems. Nitrogen gas (N2) injection has been used to enhance oil recovery in some oil fields, seeking to improve oil recovery. However, few works have implemented N2 injection and investigated its effect on asphaltene precipitation and deposition. This research investigated the N2 miscible flow mechanism in nanopores and its impact on asphaltene precipitations, which can …

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Design And Fabrication Of Nanostructured Electrodes For Complementary Electrochemical And Photoelectrochemical Water Splitting, Kholoud El Sayed Abousalem Jan 2022

Design And Fabrication Of Nanostructured Electrodes For Complementary Electrochemical And Photoelectrochemical Water Splitting, Kholoud El Sayed Abousalem

Theses and Dissertations

Designing highly active, durable, and nonprecious electrodes for overall water splitting is of urgent scientific importance to realize sustainable hydrogen production. Accordingly, the need to search efficient energy production systems is of crucial necessity. In this thesis, two various systems for sustainable hydrogen production have been reported using electrochemical and photoelectrochemical pathways. In the first part of the thesis, electrochemical water splitting involving both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) has been established. To this end, an innovative approach is demonstrated to synthesize flower-like 3D homogenous trimetallic Mn, Ni, Co phosphide catalysts directly on nickel foam via …

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Advances Of Phosphide Promoter Assisted Pt Based Catalyst For Electrooxidation Of Methanol, Meng Li, Li-Gang Feng Jan 2022

Advances Of Phosphide Promoter Assisted Pt Based Catalyst For Electrooxidation Of Methanol, Meng Li, Li-Gang Feng

Journal of Electrochemistry

Transition metal phosphide (TMP), as an ideal catalytic promoter in methanol fuel oxidation, has received increased attention because of its multifunctional active sites, tunable structure and composition, as well as unique physical and chemical properties and efficient multi-composition synergistic effect. Some advances have been made for this catalyst system recently. In the current review, the research progresses of transition metal phosphides (TMPs) in the assisted electrooxidation of methanol including the catalysts fabrication and their performance evaluation for methanol oxidation are reviewed. The promotion effect of TMPs has been firstly presented and the catalyst systems based on the different metal centers …

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A High-Performance Continuous-Flow Mea Reactor For Electroreduction Co2 To Formate, Pei-Xuan Liu, Lu-Wei Peng, Rui-Nan He, Lu-Lu Li, Jin-Li Qiao Jan 2022

A High-Performance Continuous-Flow Mea Reactor For Electroreduction Co2 To Formate, Pei-Xuan Liu, Lu-Wei Peng, Rui-Nan He, Lu-Lu Li, Jin-Li Qiao

Journal of Electrochemistry

The electrochemical carbon dioxide reduction reaction (CO2RR) is a promising approach to produce liquid fuels and industrial chemicals by utilizing intermittent renewable electricity for mitigating environmental problems. However, the traditional H-type reactor seriously limits the electrochemical performance of CO2RR due to the low CO2 solubility in electrolyte, and high ohmic resistance caused by the large distance between two electrodes, which is unbeneficial for industrial application. Herein, we demonstrated a high-performance continuous flow membranes electrode assembly (MEA) reactor based on a self-growing Cu/Sn bimetallic electrocatalyst in 0.5 mol·L-1 KHCO3 for converting CO2 to …

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Progress Of Pt-Based Catalysts In Proton-Exchange Membrane Fuel Cells: A Review, Long Huang, Hai-Chao Xu, Bi Jing, Qiu-Xia Li, Wei Yi, Shi-Gang Sun Jan 2022

Progress Of Pt-Based Catalysts In Proton-Exchange Membrane Fuel Cells: A Review, Long Huang, Hai-Chao Xu, Bi Jing, Qiu-Xia Li, Wei Yi, Shi-Gang Sun

Journal of Electrochemistry

Fuel cells are energy conversion devices that convert chemical energy directly into electricity. It has the advantages of high energy density, high utilization efficiency of fuel, clean and noiseless during working. Among all kinds of fuel cells, proton exchange membrane fuel cells (PEMFCs) are most popular since PEMFCs function at near ambient temperature, while their power densities are higher than those of other fuel cells. Currently, Pt-based nanomaterials are still the unreplaceable catalysts in commercialized PEMFCs. The lack of low-cost and high-performance cathode catalysts is still one of key factors that hampers the commercialization of PEMFCs. In this review, the …

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Oxidative Efficiency Of Ozonation Coupled With Electrolysis For Treatment Of Acid Wastewater, Ze-You Hu, Feng-Yun Xiang, Ji-Qiang Mao, Ya-Lei Ding, Shao-Ping Tong Jan 2022

Oxidative Efficiency Of Ozonation Coupled With Electrolysis For Treatment Of Acid Wastewater, Ze-You Hu, Feng-Yun Xiang, Ji-Qiang Mao, Ya-Lei Ding, Shao-Ping Tong

Journal of Electrochemistry

Establishment of an ozone-based advanced oxidation process (AOPs-O3) for effective treatment of acid wastewater is an important and difficult task. The process of ozonation coupled with electrolysis (electrolysis-ozonation, E-O3) has been reported to effectively degrade pollutants in neutral solution. We studied the efficiency of E-O3 for degradation of acetic acid (HAc, an ozone inert chemical) in acid solution and found that E-O3 had high oxidative efficiency at pH less than 3. For example, 52.2% of 100 mg·L-1 HAc could be removed by E-O3 in 120 min at pH 1.0, but only 2.2% …

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Synthesis Of Lithium-Rich Manganese-Based Layered Cathode Materials And Study On Its Structural Evolution Of First Cycle Overcharge, Chen-Xu Luo, Chen-Guang Shi, Zhi-Yuan Yu, Ling Huang, Shi-Gang Sun Jan 2022

Synthesis Of Lithium-Rich Manganese-Based Layered Cathode Materials And Study On Its Structural Evolution Of First Cycle Overcharge, Chen-Xu Luo, Chen-Guang Shi, Zhi-Yuan Yu, Ling Huang, Shi-Gang Sun

Journal of Electrochemistry

Lithium-rich manganese-based cathode materials have become one of promising cathode materials due to their low cost and large discharge specific capacity exceeding 250 mAh·g-1. However, their problems such as low coulombic efficiency of first cycle and apparent voltage decay influence commercialization process. The high charging voltage will cause instability of structure and increase the hidden danger of the battery. Therefore, structural evolution of first cycle at higher voltage needs to be further studied. In this work, the precursor was synthesized by the co-precipitation method, and the lithium-rich manganese-based layered cathode materials were prepared by lithium-mixed and high-temperature sintering, …

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Investigating The Variation In The Optical Properties Of Tio2 Thin-Film Utilized In Bifacial Solar Cells Using Machine Learning Algorithm, Ziad Khalifa, Sameh Abdellatif, Ahmed Fathi, Kareem Abdullah, Minatallah Hassan Jan 2022

Investigating The Variation In The Optical Properties Of Tio2 Thin-Film Utilized In Bifacial Solar Cells Using Machine Learning Algorithm, Ziad Khalifa, Sameh Abdellatif, Ahmed Fathi, Kareem Abdullah, Minatallah Hassan

Chemical Engineering

Among various solar cell architectures, dye-sensitized solar cells (DSSCs) and perovskite solar cells have demonstrated the capability of being bifacial as both can be fabricated on conducting glass electrodes. In both cells, TiO2 plays a key role in the optoelectronic properties of the cell. Various studies have reported a range of recipes and deposition techniques for TiO2 thin films. Such variety introduces some uncertainties into the optical properties of the prepared films as well as in the process repeatability. Here, we utilized machine learning methods to correlate the film porosity to the film refractive index, making it capable of studying …

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Heteroaggregation Of Lignin-Zein Nanoparticles: Effects Of Relative Size And Concentration, Yada Chulakham Jan 2022

Heteroaggregation Of Lignin-Zein Nanoparticles: Effects Of Relative Size And Concentration, Yada Chulakham

LSU Master's Theses

Nanotechnology has become an advanced tool for manufacturing materials of the future. As the size of a material is reduced to a nanoscale, its surface area to volume ratio increases drastically, and its surface property becomes size dependent. This allows scientists to make use of unique properties that nanomaterials have to offer to create novel materials that otherwise could not have been achieved in meter-scale materials. As more industrial companies have planned to incorporate different types of nanomaterials into their products, it is undeniable that some of these nanomaterials will be released to the environment. Such possibility has led to …

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Alf3-Al2o3 Ald Thin-Film-Coated Li1.2mn0.54co0.13ni0.13o2 Particles For Lithium-Ion Batteries: Long-Term Protection, Han Yu, Xiaoqing He, Xinhua Liang Jan 2022

Alf3-Al2o3 Ald Thin-Film-Coated Li1.2mn0.54co0.13ni0.13o2 Particles For Lithium-Ion Batteries: Long-Term Protection, Han Yu, Xiaoqing He, Xinhua Liang

Chemical and Biochemical Engineering Faculty Research & Creative Works

Improving the performance of existing cathode materials of lithium-ion batteries (LIBs) through surface modification has been proven to be an effective way to improve the performance of LIBs. However, it is a challenge to use a traditional method to prepare an effective coating film, which meets the requirements of uniformity, continuity, electrochemical stability, and strong mechanical properties. In this study, an ultrathin AlF3-Al2O3 film was coated on the surface of Li1.2Mn0.54Co0.13Ni0.13O2 (LRNMC) particles by atomic layer deposition (ALD) in a fluidized bed reactor. A cathode electrolyte …

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Examining The Effect Of A Chitosan Biopolymer On Alkali-Activated Inorganic Material For Aqueous Pb(Ii) And Zn(Ii) Sorption, Sukanta K. Mondal, Chenglin Wu, Felix C. Nwadire, Ali A. Rownaghi, Aditya Kumar, Yusuf Adewuyi, Monday Uchenna Okoronkwo Jan 2022

Examining The Effect Of A Chitosan Biopolymer On Alkali-Activated Inorganic Material For Aqueous Pb(Ii) And Zn(Ii) Sorption, Sukanta K. Mondal, Chenglin Wu, Felix C. Nwadire, Ali A. Rownaghi, Aditya Kumar, Yusuf Adewuyi, Monday Uchenna Okoronkwo

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Biopolymers and alkali-activated materials have attracted a great deal of attention as adsorbents for the removal of heavy metal contaminants from aqueous solutions. Both materials are sustainable and feature unique properties, but biopolymers are relatively more expensive or difficult to prepare and exhibit low mechanical and surface properties, a narrow pH range, and thermal stability. In this study, hybrid adsorbents were prepared from both types of material, by alkali activation of low-cost fly ash precursors accompanied by incorporation of 0-2%mass chitosan biopolymer. Two types of alkaline activating solutions, NaOH and Na2SiO3, were employed to generate two sets of hybrid adsorbents …

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Stabilizing The Interface Of All-Solid-State Electrolytes Against Cathode Electrodes By Atomic Layer Deposition, Ye Jin, Han Yu, Xiaoqing He, Xinhua Liang Jan 2022

Stabilizing The Interface Of All-Solid-State Electrolytes Against Cathode Electrodes By Atomic Layer Deposition, Ye Jin, Han Yu, Xiaoqing He, Xinhua Liang

Chemical and Biochemical Engineering Faculty Research & Creative Works

In recent years, with the severe safety problems of organic electrolytes, all-solid-state electrolytes (ASSEs) have been considered as an appealing choice to replace organic electrolytes due to their high reliability and safety. However, the uncontrolled interfacial chemical reactions between electrodes and ASSEs would lead to high interfacial resistance, which is detrimental for the battery performance. In this work, LiFePO4 (LFP) particles were coated with ultra-thin ZrO2 films by atomic layer deposition (ALD) and the effects of thin film coating on the electrochemical performance of lithium-ion batteries using the NASICON-type Li1.5Al0.5Ge1.5(PO4) …

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Application Of Gravity Data For Hydrocarbon Exploration Using Machine Learning Assisted Workflow, Oluwafemi Temidayo Alaofin Jan 2022

Application Of Gravity Data For Hydrocarbon Exploration Using Machine Learning Assisted Workflow, Oluwafemi Temidayo Alaofin

LSU Master's Theses

Gravity survey has played an essential role in many geoscience fields ever since it was conducted, especially as an early screening tool for subsurface hydrocarbon exploration. With continued improvement in data processing techniques and gravity survey accuracy, in-depth gravity anomaly studies, such as characterization of Bouguer and isostatic residual anomalies, have the potential to delineate prolific regional structures and hydrocarbon basins. In this study, we focus on developing a cost-effective, quick, and computationally efficient screening tool for hydrocarbon exploration using gravity data employing machine learning techniques. Since land-based gravity surveys are often expensive and difficult to obtain in remote places, …

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Gibbs–Duhem Relation For Phase-Field Models Of Polymeric Mixtures, Rami Alhasan, Douglas R. Tree Jan 2022

Gibbs–Duhem Relation For Phase-Field Models Of Polymeric Mixtures, Rami Alhasan, Douglas R. Tree

Faculty Publications

Phase-field models are relatively inexpensive field-based models capable of capturing the nonequilibrium multiphase behavior of polymers and other soft materials. With their rise in popularity over the past several years, questions have arisen concerning the thermodynamic consistency of some model formulations. In doing so, researchers have employed several different forms of the Gibbs–Duhem equation─a classical thermodynamic relationship used to assess consistency─leading to questions about the correct form of this expression for inhomogeneous mixtures. In this paper, we derive a generalized Gibbs–Duhem relation that is valid for phase-field models. The key to the derivation is the recognition that the functional derivatives …

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Combined Ibuprofen And Curcumin Delivery Using Mg-Mof-74 As A Single Nanocarrier, Shane Lawson, Ali A. Rownaghi, Fateme Rezaei Jan 2022

Combined Ibuprofen And Curcumin Delivery Using Mg-Mof-74 As A Single Nanocarrier, Shane Lawson, Ali A. Rownaghi, Fateme Rezaei

Chemical and Biochemical Engineering Faculty Research & Creative Works

Metal-organic frameworks (MOFs) have been extensively used as drug delivery platforms because of their considerable textural properties and physiochemical tunability. However, most medicinal treatments often administer multiple therapeutic pharmaceuticals simultaneously and combined drug delivery over a single MOF carrier has not been extensively developed. As such, in this study we implemented Mg-MOF-74, which is known to have rapid pharmacokinetic properties, for the combined delivery of ibuprofen and curcumin to demonstrate the proof-of-concept for dual-drug delivery over this previously unexplored MOF. To this end, 30 wt % total drug loading of two drugs was impregnated at various ratios (25:5 ibuprofen-curcumin, 20:5 …

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Contact‐Free Remote Manipulation Of Hydrogel Properties Using Light‐Triggerable Nanoparticles: A Materials Science Perspective For Biomedical Applications, Cho-E Choi, Aishik Chakraborty, Ali Coyle, Yasmeen Shamiya, Arghya Paul Jan 2022

Contact‐Free Remote Manipulation Of Hydrogel Properties Using Light‐Triggerable Nanoparticles: A Materials Science Perspective For Biomedical Applications, Cho-E Choi, Aishik Chakraborty, Ali Coyle, Yasmeen Shamiya, Arghya Paul

Chemical and Biochemical Engineering Publications

Considerable progress has been made in synthesizing “intelligent”, biodegradable hydrogels that undergo rapid changes in physicochemical properties once exposed to external stimuli. These advantageous properties of stimulus-triggered materials make them highly appealing to diverse biomedical applications. Of late, research on the incorporation of light-triggered nanoparticles (NPs) into polymeric hydrogel networks has gained momentum due to their ability to remotely tune hydrogel properties using facile, contact-free approaches, such as adjustment of wavelength and intensity of light source. These multi-functional NPs, in combination with tissue-mimicking hydrogels, are increasingly being used for on-demand drug release, preparing diagnostic kits, and fabricating smart scaffolds. Here, …

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Addressing Pfas Contamination In Blood Bank Supplies With Hydrogel Nanocomposite Sorbents, Anicah Lynn Smith, E. Molly Frazar, J. Zach Hilt Jan 2022

Addressing Pfas Contamination In Blood Bank Supplies With Hydrogel Nanocomposite Sorbents, Anicah Lynn Smith, E. Molly Frazar, J. Zach Hilt

Posters-at-the-Capitol

Environmental pollutants continue to be a threat to global human health. Persistent contaminants, such as perfluoroalkyl substances (PFAS), have been linked to a multitude of adverse health effects such as cancerous tumors, increased blood cholesterol levels and liver damage. The dominant source of exposure to PFAS is through contaminated drinking water, and accumulation has been found to occur significantly in human blood serum. Thus, high-risk groups who are receiving frequent blood transfusions are exposed to these harmful chemicals in a dual fashion, which could prove detrimental. Traditional sorbents that display an affinity for PFAS include powdered activated carbon and clay. …

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Role Of Inflammatory Niche And Adult Cardiomyocyte Coculture On Differentiation, Matrix Synthesis, And Secretome Release By Human Bone Marrow Mesenchymal Stem Cells, Jyotsna Joshi, Chandrasekhar R. Kothapalli Jan 2022

Role Of Inflammatory Niche And Adult Cardiomyocyte Coculture On Differentiation, Matrix Synthesis, And Secretome Release By Human Bone Marrow Mesenchymal Stem Cells, Jyotsna Joshi, Chandrasekhar R. Kothapalli

Chemical & Biomedical Engineering Faculty Publications

Myocardial infarction (MI) causes cardiomyocyte death, provokes innate immune response, and initiates tissue remodeling. The intrinsic healing process is insufficient to replace the lost cells, or regenerate and restore the functional features of the native myocardium. Autologous bone marrow-derived mesenchymal stem cell (BM-MSC) transplantation is being explored to offer therapeutic potential after MI. Here, we cultured human BM-MSC spheroids in three-dimensional collagenous gels for 28 days under exposure to tumor necrosis factor-alpha (+ TNFα), and coculture with adult human cardiomyocytes, or with conditioned media (CM) pooled from TNFα-stimulated adult cardiomyocytes. MSC differentiation marker (CD90, GATA4, cTnI, cTnT, Cx43, MHC, α-actin) …

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Centrifugal Assembly Of Bijel Ropes Via Helical Microfluidics, Shankar P. Kharal Jan 2022

Centrifugal Assembly Of Bijel Ropes Via Helical Microfluidics, Shankar P. Kharal

Theses and Dissertations

Bicontinuous interfacially jammed emulsion gels (bijels) are soft materials that retain a liquid bicontinuous network stabilized by an interfacially jammed layer of nanoparticles. In this thesis, we investigated a microfluidic twisting method to fabricate micro-ropes of nano-structured bijel fibers. This method shows how weak microfibers with tensile strengths of a few kPa can be reinforced by 4 orders of magnitude by means of microfluidic twisting. Microfluidic twisting allows to produce continuous bijel fiber ropes of controllable architecture. Modelling the fluid flow field reveals the rope geometry dependence on a subtle force balance composed of rotational and translational shear stresses. However, …

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A Phase Field Model For Dynamic Simulations Of Reactive Blending Of Polymers, Mukul D. Tikekar, Kris T. Delaney, Michael C. Villet, Douglas R. Tree Jan 2022

A Phase Field Model For Dynamic Simulations Of Reactive Blending Of Polymers, Mukul D. Tikekar, Kris T. Delaney, Michael C. Villet, Douglas R. Tree

Faculty Publications

A facile way to generate compatibilized blends of immiscible polymers is through reactive blending of end-functionalized homopolymers. The reaction may be reversible or irreversible depending on the end-groups and is affected by the immiscibility and transport of the reactant homopolymers and the compatibilizing copolymer product. Here we describe a phase-field framework to model the combined dynamics of reaction kinetics, diffusion, and multi-component thermodynamics on the evolution of the microstructure and reaction rate in reactive blending. A density functional with no fitting parameters, which is obtained by adapting a framework of Uneyama and Doi and qualitatively agrees with self-consistent field theory, …

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A Combined Electrochemical-Biological System For The Production Of Liquid Fuel From Co2, Elizabeth Hann Jan 2022

A Combined Electrochemical-Biological System For The Production Of Liquid Fuel From Co2, Elizabeth Hann

Link Foundation Energy Fellowship Reports

Biological photosynthesis is the origin of our liquid transportation fuels, from petroleum to corn ethanol. Biological photosynthesis has an efficiency of approximately 1% for the conversion of photons from sunlight to biomass1. Increasing the energy efficiency of biomass production (solar-to-biomass conversion) would allow for biomass, and biofuels, to be produced using less resources. Artificial photosynthesis seeks to overcome the limitations of biological photosynthesis, including low efficiency of solar energy capture and poor carbon dioxide reduction, and could provide an alternative route for biomass production. A two-step electrochemical process converts CO2 to acetate. Acetate is a soluble, two-carbon substrate that can …

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Leveraging The Advancements In Functional Biomaterials And Scaffold Fabrication Technologies For Chronic Wound Healing Applications, Alap A. Zahid, Aishik Chakraborty, Yasmeen Shamiya, Shruthi Polla Ravi, Arghya Paul Jan 2022

Leveraging The Advancements In Functional Biomaterials And Scaffold Fabrication Technologies For Chronic Wound Healing Applications, Alap A. Zahid, Aishik Chakraborty, Yasmeen Shamiya, Shruthi Polla Ravi, Arghya Paul

Chemical and Biochemical Engineering Publications

Exploring new avenues for clinical management of chronic wounds holds the key to eliminating socioeconomic burdens and health-related concerns associated with this silent killer. Engineered biomaterials offer great promise for repair and regeneration of chronic wounds because of their ability to deliver therapeutics, protect the wound environment, and support the skin matrices to facilitate tissue growth. This mini review presents recent advances in biomaterial functionalities for enhancing wound healing and demonstrates a move from sub-optimal methods to multi-functionalized treatment approaches. In this context, we discuss the recently reported biomaterial characteristics such as bioadhesiveness, antimicrobial properties, proangiogenic attributes, and anti-inflammatory properties …

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Development And Characterisation Of A Whole Hybrid Sol-Gel Optofluidic Platform For Biosensing Applications, Emma Mchugh, Graceson Antony, Arun Kumar Mallik, Alicja Kaworek, Declan Mccormack, Brendan Duffy, Mohamed Oubaha Jan 2022

Development And Characterisation Of A Whole Hybrid Sol-Gel Optofluidic Platform For Biosensing Applications, Emma Mchugh, Graceson Antony, Arun Kumar Mallik, Alicja Kaworek, Declan Mccormack, Brendan Duffy, Mohamed Oubaha

Articles

This work outlines, for the first time, the fabrication of a whole hybrid sol-gel optofluidic platform by integrating a microfluidic biosensor platform with optical waveguides employing a standard photolithography process. To demonstrate the suitability of this new hybrid sol-gel optofluidic platform, optical and bio-sensing proof-of-concepts are proposed. A photoreactive hybrid sol-gel material composed of a photopolymerisable organically modified silicon alkoxide and a transition metal complex was prepared and used as the fabrication material for the entire optofluidic platform, including the optical waveguides, the sensing areas, and the microfluidic device. The most suitable sol-gel materials chosen for the fabrication of the …

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Castor Oil Conversion To Biodiesel: A Process Simulation Study, Islam M. Al-Akraa Jan 2022

Castor Oil Conversion To Biodiesel: A Process Simulation Study, Islam M. Al-Akraa

Chemical Engineering

No abstract provided.

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Effect Of Palladium Loading On Catalytic Properties Of Pd/Gce For The Electro-Oxidation Of Methanol, Formic Acid, And Ethylene Glycol, Islam M. Al-Akraa Jan 2022

Effect Of Palladium Loading On Catalytic Properties Of Pd/Gce For The Electro-Oxidation Of Methanol, Formic Acid, And Ethylene Glycol, Islam M. Al-Akraa

Chemical Engineering

No abstract provided.

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ผลของชนิดกรดที่มีต่อระยะเวลาเข้าสู่สมดุลของการผลิตและการเจือจางกรดเปอร์อะซีติก, ธนาภรณ์ จอกลอย Jan 2022

ผลของชนิดกรดที่มีต่อระยะเวลาเข้าสู่สมดุลของการผลิตและการเจือจางกรดเปอร์อะซีติก, ธนาภรณ์ จอกลอย

Chulalongkorn University Theses and Dissertations (Chula ETD)

งานวิจัยนี้ทำการศึกษาผลของชนิดและความเข้มข้นกรดที่มีต่อระยะเวลาเข้าสู่สมดุลของการผลิตและการเจือจางกรดเปอร์อะซีติก โดยกรดที่นำมาศึกษามีจำนวน 3 ชนิด ได้แก่ กรดไฮโดรคลอริก (HCl), กรดฟอสฟอริก (H3PO4) และกรดซัลฟิวริก (H2SO4) ที่ความเข้นข้น 0.05 และ 0.1 M โดยการทำปฏิกิริยาจะทำที่อุณหภูมิห้อง และติดตามการเปลี่ยนแปลงของกรดทั้งหมดในปฏิกิริยาโดยการไทเทรตด้วยเครื่อง Auto Titrator ด้วยสารละลายโซเดียมไฮดรอกไซด์ และหาปริมาณของไฮโดรเจนเปอร์ออกไซด์ที่เหลือโดยการไทเทรตกับสารละลายโพแทสเซียมเปอร์แมงกาเนต จากผลการทดลองพบว่าการมีกรดในปฏิกิริยาสามารถเร่งปฏิกิริยาให้เข้าสู่สมดุลได้เร็วขึ้น ยกเว้นกรดไฮโดรคลอริกที่ไปเร่งการสลายตัวของไฮโดรเจนเปอร์ออกไซด์ จนทำให้ปฏิกิริยาแทบไม่เกิด และในส่วนของการเจือจางกรดเปอร์อะซีติกก่อนการใช้งาน พบว่าหลังจากเจือจางแล้วควรใช้ทันทีภายใน 1 วัน

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