Engineering Commons^™

Timcc: On Data Freshness In Privacy-Preserving Incentive Mechanism Design For Continuous Crowdsensing Using Reverse Auction, Xiaoqiang Ma, Weiwei Deng, Feng Wang, Menglan Hu, Fei Chen, Mohammad Mehedi Hassan

Faculty and Student Publications

© 2013 IEEE. As an emerging paradigm that leverages the wisdom and efforts of the crowd, mobile crowdsensing has shown its great potential to collect distributed data. The crowd may incur such costs and risks as energy consumption, memory consumption, and privacy leakage when performing various tasks, so they may not be willing to participate in crowdsensing tasks unless they are well-paid. Hence, a proper privacy-preserving incentive mechanism is of great significance to motivate users to join, which has attracted a lot of research efforts. Most of the existing works regard tasks as one-shot tasks, which may not work very …

Dispersion Of Spherical Silicon Dioxide Nanoparticles In Poly(Styrene-B-Methyl Methacrylate) Diblock Copolymer Domains, Joshua C. Obinwa

Master's Theses

Polymer-nanoparticle hybrids are nanomaterials in which the unique properties of the nanosized structures can be precisely tuned by choosing an appropriate combination of the polymer and the nanoparticle. However, nanoparticle dispersion in a polymer is challenging due to the aggregation tendency of nanoparticles. To improve nanoparticle dispersion and control the location of nanoparticles in block copolymer assemblies, the nanoparticle surface is modified with surface ligands compatible with the block copolymer. In this thesis, hydroxyl-terminated poly(styrene-b-methyl methacrylate) (PS-b-PMMA) was utilized to functionalize the nanoparticle surface, covalently anchoring the hydroxylterminated end of the polymer onto the silicon dioxide nanoparticles. The silicon dioxide …

Molecular Weight And Heating Value Of Lignin Extracted Using Deep Eutectic Solvent., Ekugbere Owen Owhe

Master's Theses

The molecular weight of lignin helps us to determine how lignin can be applied accurately in industry. The molecular weight can predict the behavior of lignin, and how it will function when combined with other materials. This thesis discusses how the molecular weight of lignin can be found with gel permeation chromatography (GPC) after acetylation with acetic anhydride and pyridine. Different lignins gave different number average molecular weight and weight average molecular weight values, which were likely due to the biomass source, type of extraction and solubility in the solvent of choice. How the structure of lignin changed after derivatization …

Che 472-Hm2: Process And Plant Design Honors, Nellone Reid

Chemical and Materials Engineering Syllabi

No abstract provided.

Aqueous And Oil Products From Hydrothermal Liquefaction Of Manure Digestate, Kenzie Burns

Honors Theses

Hydrothermal liquefaction is a promising thermochemical waste-to-energy (WtE) technology for conversion of wet biomasses, such as manure and digested manure, into value-added products, namely energy-rich biofuel and a nutrient-rich aqueous product. WtE technologies can address environmental issues relating to overproduction of organic wastes and increasing dependence on fossil fuels, which leads to climate change. HTL has not been implemented on a commercial scale, in part due to the uncertainty regarding specific reaction pathways for different feedstocks and ideal conditions for production of the most valuable products.

This research investigates the compositions of the aqueous and oil products from HTL of …

Ac Conductivity Studies Of Polyethylene-Oxide-Garnet Type Li7la3zr2o12 Hybrid Composite Solid Polymer Electrolyte For Li-Ion Battery, Parisa Bashiri

Wayne State University Dissertations

Solid electrolytes including ceramics and polymers are considered to be the ultimate substitute for organic liquid electrolytes currently used in commercialized lithium ion batteries to address the safety concerns due to Li dendrite growth and internal short circuiting. However, low ionic conductivity due to high grain boundary resistance in ceramics and semi-crystalline nature of polymers has held back the solid electrolytes from being used in Li-ion batteries. Polyethylene oxide (PEO), complexed with a Li-salt, is a well-studied polymer electrolyte showing ionic conductivity properties at room temperature. However, the coexistence of amorphous and crystalline regions at room temperature (< Tm, the melting temperature) has

-8 -6 …

Development Of Amine-Functionalized Mesoporous Alumina For Radioiodine Removal From Water, Mansour Mohammed Alsalbokh

Masters Theses

“Radioactive materials have spread due to careless disposal and nuclear disasters. Some radionuclides can exist in an aqueous media, like radioactive iodine. As a result, in this work amine-functionalized mesoporous alumina was developed to adsorb radioactive iodine from the liquid phase. Bismuth was incorporated, using a wet impregnation method, to test it as a possible silver replacement. Amine grafting was used to functionalize the surface of the mesoporous alumina. All materials prepared in this work were characterized by N₂ physisorption, FTIR and TGA to determine the textural properties, surface functionality, and amine loading. The synthesized materials were tested for …

Integral Mass Balance (Imb) Method For Measuring Multicomponent Gas Adsorption Equilibria In Nanoporous Materials, Darren P. Broom, Orhan Talu, Michael J. Benham

Chemical & Biomedical Engineering Faculty Publications

© 2020 American Chemical Society. To assess the performance of an adsorbent for a particular gas separation, and for process design, it is necessary to determine multicomponent gas adsorption equilibria, either experimentally or from predictions based on models or theory. The experimental techniques commonly used for this purpose, however, are time-consuming and typically require large samples. In this article, we describe a new approach, called the Integral Mass Balance (IMB) method, which combines the controlled flow of a gas mixture with in situ gravimetric measurement and gas composition analysis using quadrupole mass spectrometry. The IMB method allows very rapid equilibrium …

การพัฒนาเมมเบรนเพื่อจับแก๊สคาร์บอนไดออกไซด์ด้วยกระบวนการเมมเบรนแก๊สแอบซอร์ปชัน, สุพิชญา ศรีสดใส

Chulalongkorn University Theses and Dissertations (Chula ETD)

งานวิจัยนี้ศึกษาเกี่ยวกับปัจจัยในการขึ้นรูปของเมมเบรนชนิดแผ่นเรียบด้วยวิธีการเปลี่ยนวัฏภาคเพื่อทดสอบประสิทธิภาพการจับแก๊สคาร์บอนไดออกไซด์ด้วยกระบวนการเมมเบรนแก๊สแอบซอร์ปชันซึ่งในกระบวนการดังกล่าวมักพบปัญหาสำคัญที่เกิดจากการใช้งานคือการเปียกของเมมเบรน ซึ่งก่อให้เกิดความเสียหายต่อเมมเบรนและประสิทธิภาพของเมมเบรนในการจับแก๊สคาร์บอนไดออกไซด์ลดน้อยลง โดยในงานวิจัยนี้สนใจที่จะนำสาร 2 ประเภทคือ แอลกอฮอล์ (เมทานอลและเอทานอล) และคาร์บอนแบล็คมาใช้เป็นสารเติมแต่งให้กับสารละลายพอลิไวนิลลิดีนฟลูออไรด์เพื่อปรับโครงสร้างสัณฐานวิทยาและคุณสมบัติความไม่ชอบน้ำของเมมเบรน ผลการศึกษาพบว่าเมื่อเติมสารเติมแต่งประเภทแอลกอฮอล์แล้ว สามารถช่วยเพิ่มขนาดของรูพรุนและความพรุนบนพื้นผิวเมมเบรนได้ โดยเมื่อเติมสารเติมแต่งเมทานอลกับคาร์บอนแบล็ค 5 เปอร์เซ็นโดยน้ำหนักสามารถลดขนาดรูพรุนเฉลี่ยได้ ซึ่งมีค่าเท่ากับ 192.5 นาโนเมตรเนื่องจากสามารถลดค่าความเข้ากันได้ของตัวทำละลายและตัวไม่ละลาย (น้ำ) ที่มีผลต่อการเปลี่ยนวัฏภาคของเมมเบรนให้ช้าลงและเมื่อเพิ่มปริมาณของคาร์บอนแบล็คที่ความเข้มข้นแตกต่างกัน (2.5, 5, 7.5 เปอร์เซ็นโดยน้ำหนัก) ทำให้เพิ่มค่ามุมสัมผัสของความไม่ชอบน้ำของเมมเบรนจาก 79 องศาเป็น 88 องศาและความพรุนบนพี้นผิวของเมมเบรนที่เพิ่มมากขึ้น เมื่อนำไปทดสอบด้วยกระบวนการเมมเบรนแก๊สแอบซอร์ปชันโดยใช้โมโนเอทาโนลามีน 3 โมลาร์เป็นสารดูดซึม ได้ค่าฟลักซ์ของการดูดซึมแก๊สคาร์บอนไดออกไซด์ที่ 3.57±1.1 มิลลิโมลต่อตารางเมตรต่อวินาที

การออกแบบการบูรณาการความร้อนของกระบวนการผลิตแอลฟ่าเมทิลเอสเตอร์ซัลโฟเนท, กฤตวิทย์ ชอบทำดี

Chulalongkorn University Theses and Dissertations (Chula ETD)

แอลฟ่าเมทิลเอสเทอร์ซัลโฟเนทเป็นสารลดแรงตึงผิวที่ผลิตจากเคมีชีวภาพจากน้ำมันพืชหรือไขมันสัตว์ ซึ่งเป็นสารลดแรงตึงผิวที่มีคุณภาพดีและมีคุณสมบัติใกล้เคียงกับโซเดียมโดเดซิลเบนซีนซัลโฟเนท โซเดียมลอริลอีเทอร์ซัลเฟต และโซเดียมโดเดซิลซัลเฟต ที่เป็นสารลดแรงตึงผิวที่ผลิตมาจากปิโตรเลียม เนื่องจากแนวทางการใช้พลังงานเชื้อเพลิงของโลกเปลี่ยนแปลงในอนาคต จะส่งผลให้ความต้องการใช้เมทิลเอสเทอร์ในอนาคตมีแนวโน้มลดลง งานวิจัยนี้ได้ศึกษากระบวนการผลิตแอลฟ่าเมทิลเอสเทอร์ซัลโฟเนท เนื่องจากเป็นสารเคมีที่ใช้เมทิลเอสเทอร์เป็นสารตั้งต้นในกระบวนการผลิต ทำให้เป็นโอกาสที่จะชดเชยการใช้เมทิลเอสเทอร์เป็นพลังงานเชื้อเพลิงที่ลดลงได้ ซึ่งในกระบวนการผลิตแอลฟ่าเมทิลเอสเทอร์ซัลโฟเนทเป็นกระบวนการผลิตที่คายพลังงานความร้อนออกจากกระบวนการผลิต จึงเห็นโอกาสในการนำพลังงานกลับมาใช้เกิดประโยชน์อีกทั้งเป็นการช่วยลดต้นทุนในการผลิตของเเอลฟ่าเมทิลเอสเทอร์ซัลโฟเนทได้อีกด้วย โดยมีวัตถุประสงค์ของงานวิจัย คือ เพื่อปรับปรุงและพัฒนาประสิทธิภาพของเครื่องแลกเปลี่ยนความร้อนโดยการออกแบบเครื่องแลกเปลี่ยนความร้อนแบบเครือข่าย ศึกษาและวิเคราะห์ผลการออกแบบเครื่องแลกเปลี่ยนความร้อนแบบเครือข่ายและความเป็นไปได้ในการลงทุนโดยใช้โปรแกรม Aspen plus และ Aspen energy analyzer โดยผลการสร้างแบบจำลองพบว่าการใช้น้ำเป็นสารหล่อเย็นในกระบวนการผลิตจะส่งให้พื้นที่รวมของเครื่องแลกเปลี่ยนความร้อนน้อยกว่าการใช้อากาศเป็นสารหล่อเย็นและแบบจำลองดังกล่าวสามารถผลิตไอน้ำจากกระบวนการผลิตได้ 25,000 กิโลกรัมต่อชั่วโมง ที่ความดันของไอน้ำ 3 บาร์ สามารลดปริมาณการใช้เอททีลีนไกลคอนได้ 11,085 กิโลกรัมต่อชั่วโมงโดยใช้เมทานอลในกระบวนการผลิตมาแลกเปลี่ยนความร้อนแทนและสามารถลดพื้นที่แลกเปลี่ยนความร้อนรวมของกระบวนการผลิตเหลือเป็น 394.70 ตารางเมตร

Enhanced Water Electrolysis: Effect Of Temperature On The Oxygen Evolution Reaction At Cobalt Oxide Nanoparticles Modified Glassy Carbon Electrodes, Aya Akl, Hany A. Elazab, Mohamed A. Sadek, Mohamed S. El-Deab

Chemical and Biochemical Engineering Faculty Research & Creative Works

Water splitting producing hydrogen and oxygen gases appears promising in view of the increasing need of renewable energy sources and storage strategies. Investigation of stable and highly efficient electrocatalysts for oxygen evolution reaction (OER) is targeted in this study at cobalt oxide nanoparticle modified glassy carbon (nano-CoOx/GC) electrodes. The effect of the preparation (Tp) and measuring temperature (Tm) on the electrocatalytic activity of nano-CoOx/GC towards the OER is investigated under various operating conditions. Linear sweep voltammetry (LSV), cyclic voltammetry (CV) as well as SEM and XRD techniques were used to probe the electrocatalytic and morphological characteristics of nano-CoOx prepared under …

Synthesis And Characterization Of Pvp Based Catalysts For Selected Application In Catalysis, Hany A. Elazab, Mohamed N. Ayad, Mohamed M. Hammam, Mostafa A. Radwan, Mohamed A. Sadek

Chemical and Biochemical Engineering Faculty Research & Creative Works

This research aims to study the catalyst activity in specific reactions and the characteristics of the catalyst in order to optimize its performance. This research investigates PVP based catalysts and their properties and applications. PVP was prepared in combination with different metal oxides in order to be tested for different catalytic applications including dye removal. Methyl orange was used as a dye and different concentrations were tested against different metallic ions in order to optimize the catalyst for being used in dye removal applications. Spectrophotometer was used to calculate the concentration of the dye before and after catalyst exposure and …

Application Of Immobilized Palladium Monolithic Catalysts In Suzuki-Miyaura And Tsuji-Wacker Redox Reactions, Sajjad Ghobadi

Theses and Dissertations

Herein, a wholistic analysis of the viability of monolithic catalysts for redox reactions is presented. The interdisciplinary approach taken in this systematic study included preparation and investigation on Pd-on-carbon monoliths as catalysts in a flow and electrochemical settings.

The Suzuki-Miyaura reaction-focused study led to rational design, preparation, and successful application of Pd⁰-on-graphene oxide (GO) monolithic catalysts in flow conditions. In this study a combination of chemical reduction, freeze-casting, and vapor-phase reduction processes was applied to Pd-GO structures leading to the preparation of these monoliths. The Suzuki flow synthesis reactions revealed that the monolithic structure led to significantly improved …

Process Data Analytics Using Deep Learning Techniques, Majid Moradi Aliabadi

Wayne State University Theses

In chemical manufacturing plants, numerous types of data are accessible, which could be process operational data (historical or real-time), process design and product quality data, economic and environmental (including process safety, waste emission and health impact) data. Effective knowledge extraction from raw data has always been a very challenging task, especially the data needed for a type of study is huge. Other characteristics of process data such as noise, dynamics, and highly correlated process parameters make this more challenging.

In this study, we introduce an attention-based RNN for multi-step-ahead prediction that can have applications in model predictive control, fault diagnosis, …

Energy Conservation And Heat Transfer Enhancement For Mixed Convection On The Vertical Galvanizing Furnace, Dan Mei, Yuzheng Zhu, Xuemei Xu, Futang Xing

Mechanical & Aerospace Engineering Faculty Publications

The alloying temperature is an important parameter that affects the properties of galvanized products. The objective of this study is to explore the mechanism of conjugate mixed convection in the vertical galvanizing furnace and propose a novel energy conservation method to improve the soaking zone temperature based on the flow pattern and heat transfer characteristics. Herein, the present study applied the k-ε two-equation turbulence model to enclose the Navier-Stokes fluid dynamic and energy conservation equations, and the temperature distributions of the steel plate and air-flow field in the furnace were obtained for six Richardson numbers between 1.91 ⋅ 10^{5 …}

Mixing Optimization In Grooved Serpentine Microchannels, Tyler Rhoades, Chandrasekhar R. Kothapalli, Petru S. Fodor

Chemical & Biomedical Engineering Faculty Publications

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. Computational fluid dynamics modeling at Reynolds numbers ranging from 10 to 100 was used to characterize the performance of a new type of micromixer employing a serpentine channel with a grooved surface. The new topology exploits the overlap between the typical Dean flows present in curved channels due to the centrifugal forces experienced by the fluids, and the helical flows induced by slanted groove-ridge patterns with respect to the direction of the flow. The resulting flows are complex, with multiple vortices and saddle points, leading to enhanced mixing across the section …

Role Of The Adhesion Torque On Spiky Particles Deposition, Kailian Davis

Summer Community of Scholars Posters (RCEU and HCR Combined Programs)

No abstract provided.

Two-Dimensional Nanomaterials And Their Composites For Electrochemical Detection Of Toxic Mercury Ions In Water, Md Tawabur Rahman

Electronic Theses and Dissertations

The presence of trace amounts of mercury ion (Hg²⁺) in drinking water has a detrimental effect on human health. The development of an electrochemical sensor for Hg²⁺ detection is still challenging to obtain ultra-trace sensitivity, excellent selectivity, wide Linear Detection Ranges (LDRs), and ultra-low detection limit. This work presents an electrochemical sensor based on two-dimensional nanomaterials and their composites for the enhanced sensing of Hg²⁺ in water. Graphene oxide (GO)-silver nanowires (AgNWs) composite and metallic 1T phase tungsten disulfide (WS2) microflowers were utilized for the fabrication of electrochemical sensors using drop-casting. Under the optimized experimental conditions, …

Investigating The Factors Impacting The Success Of Immiscible Carbon Dioxide Injection In Unconventional Shale Reservoirs: An Experimental Study, Sherif M. Fakher

Doctoral Dissertations

"Unconventional shale reservoirs are currently gaining significant interest due to the huge hydrocarbon volumes that they bear. Enhanced oil recovery (EOR) techniques have been suggested to increase recovery from shale reservoirs. One of the most promising EOR methods is gas EOR (GEOR), most notably carbon dioxide (CO₂). Not only can CO₂ increase oil recovery by interacting with the oil and the shale, but it has also been shown to adsorb to the shale rock and thus is effective in both EOR applications and also carbon storage purposes. This research aims to experimentally investigate several of the interactions …

An Integrated Wellbore Stability Study To Mitigate Expensive Wellbore Instability Problems While Drilling Into Zubair Shale/Sand Sequence, Southern Iraq, Ahmed Khudhair Abbas

Doctoral Dissertations

”The Zubair Formation is the most prolific reservoir in Iraq, which is comprised of sandstones interbedded with shale sequences. Due to the weak nature of the shale sequence, the instability of a wellbore is one of the most critical challenges that continuously appears during drilling across this formation. Historically, over 90% of wellbore problems in the Zubair Formation were due to wellbore instability. Problems associated with wellbore instability, such as tight hole, shale caving, stuck logging tools along with subsequent fishing, stuck pipe, and sidetracking result in increasing the non-productive time. This non-productive time has cost an enormous amount of …

Studies On The Stability Of Plasma Proteins And Their Fragments, Paul Praveen Nakka

Doctoral Dissertations

“The stability of a protein-based biological drug is an important concern during processing, storage or patient administration. There are various forces which contribute to the stabilizing of proteins. Both hydrogen bonds and hydrophobic interactions play an important role in protein stability. Improper folding or misfolding of proteins leads to aggregation, which is a major problem found in the bioprocessing industry. The objectives of this research are: 1) to determine the effect of environmental factors such as pH, temperature, additives or salts, and cosolvents on the stability human serum albumin (HAS), which is the most abundant protein in plasma, 2) to …

Process Intensification Of Fuel Synthesis And Electrolysis, Jeremy Lee Hartvigsen

Doctoral Dissertations

”As more renewable energy is added to the electric grid, energy storage becomes a high priority. Suggestions have been made for energy storage in the form of fuel and chemicals. Currently, Solid Oxide Electrolysis systems can operate in endothermic mode and reduce the electrical requirement by supplying heat. Fuel synthesis from syngas is exothermic and can supply heat. However, the temperature mismatch in the normal operation of the electrolysis step and fuel synthesis step makes the direct utilization of this heat impossible. This work explores possibilities of alternate arrangements of coupling electrochemical systems and chemical synthesis. This work also explores …

Experimental Study On A Novel Eor Method -- Polymeric Nanogel Combined With Surfactant And Low Salinity Water Flooding To Enhance Oil Recovery, Mustafa M. Almahfood

Doctoral Dissertations

“Extracting higher amounts of oil from current reservoirs is a necessity for the oil industry to enhance their profitability and sustainability. The desire to recover more oil from the existing reservoirs has led to a growing interest of nanoparticle application in enhanced oil recovery (EOR). However, most researchers have focused on the evaluation and surface modification of non-deformable nanoparticles. This dissertation evaluates the potential of deformable nanogel particles as an EOR material when they are combined with two other promising technologies - surfactant and low salinity water floodings. The particle size distribution, ζ-potential and interfacial tension were measured for a …

Microgel Placement And Plugging Performance In Sand Filled Fracture For Conformance Control, Baihua Lin

Masters Theses

“Preformed particle gels (PPG) has been widely applied for conformance control in heterogeneous reservoirs with fractures and super-K channels. As a plugging agent, PPG could plug the fractures or high permeability streaks and divert the displacing fluid into low permeability matrix. Many studies have been conducted to investigate the potential of PPGs as a water cut reduction and improved oil recovery agent using homogeneous sandpacks or heterogeneous core samples with man-made open fractures. However, no research has been carried out to understand how PPG injection and plugging performance will be changed if the fractures are filled with sands. Herein, the …

Evaluation Of Nox‑Reduction Measures For Iron-Ore Rotary Kilns, Rikard Ekland, Thomas Allguren, Christian Fredriksson, Denver Haycock, Colson Johnson, Jacob Fransen, Thomas H. Fletcher, Klas Andersson

Faculty Publications

The grate-kiln process is employed for sintering and oxidation of iron-ore pellets. In this process, a fuel (typically coal) is combusted with a large amount of excess air in a rotary kiln, and the high air-to-fuel ratio leads to significant NOx formation. The current Article is an assessment of NOx reduction measures that have been tested in pilot-scale and in full-scale by the Swedish iron-ore company Luossavaara-Kiirunavaara Aktiebolag (LKAB). The results show that the scaling between the full-scale kiln and the pilot-scale kiln is crucial, and several primary measures that reduce NOx significantly in pilot-scale achieve negligible reduction in full-scale. …

Chemical And Thermal Sintering Of Supported Metals With Emphasis On Cobalt Catalysts During Fischer−Tropsch Synthesis, Mahmood Rahmati, Mohammad-Saeed Safdari, Thomas H. Fletcher, Morris D. Argyle, Calvin H. Bartholomew

Faculty Publications

This comprehensive critical review combines, for the first time, recent advances in nanoscale surface chemistry, surface science, DFT, adsorption calorimetry, and in situ XRD and TEM to provide new insights into catalyst sintering. This work provides qualitative and quantitative estimates of the extent and rate of sintering as functions of nanocrystal (NC) size, temperature, and atmosphere. This review is unique in that besides summarizing important, useful data from previous studies, it also advances the field through addition of (i) improved or new models, (ii) new data summarized in original tables and figures, and (iii) new fundamental perspectives into sintering of …

Effect Of Hydrochloric Acid Modification On Different Clay Catalystsfor Esterification Of Ethanol And Acetic Acid, Kwanchanok Netcharoen

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research aims to investigate the catalytic performance and characteristics of different clays with 0.5 M hydrochloric acid modification such as montmorillonite (HA-MMT), montmorillonite modified with Al (HA/Al-MMT), and kaolinite (HA-K) as a solid catalysts for esterification of ethanol and acetic acid. The reaction was performed in a batch reactor at 80oC, molar ratio of ethanol/acetic acid at 1.5, atmospheric pressure, and catalyst 10%wt of acetic acid for 1 hour. It revealed that hydrochloric acid-activated did not affect to the main structure and functional group of clays. All catalysts were tested for the catalytic performance in esterification of ethanol and …

Development Of Graft Copolymers Of Ultrafine Fully Vulcanized Powdered Natural Rubber With Styrene Or Acrylonitrile Monomers, Niratchaporn Rimdusit

Chulalongkorn University Theses and Dissertations (Chula ETD)

Ultrafine fully vulcanized powdered natural rubber (UFPNRs) were prepared by electron beam irradiation of graft copolymers, i.e. DPNR-graft-polystyrene (DPNR-g-PS) and DPNR-graft-polyacrylonitrile (DPNR-g-PAN), followed by spray drying process. The graft copolymers were prepared by grafting with styrene or acrylonitrile monomer onto deproteinized natural rubber (DPNR) via emulsion polymerization. The effects of monomer contents and radiation doses on thermal properties, chemical structure, swelling behaviors, and morphology of UFPNRs, i.e. UFPNR-GST and UFPNR-GAN were investigated. The results found that the highest grafting efficiency of the DPNR-g-PS and the DPNR-g-PAN were obtained at 15 phr of styrene or acrylonitrile content which provided the highest …

Development Of High Performance Ballistic Hard Armor Based On Fibers Reinforced Polybenzoxazine Alloy Filled With Nanoparticles, Phattarin Mora

Chulalongkorn University Theses and Dissertations (Chula ETD)

The multilayered armor based on fabric reinforced polybenzoxazine (poly(BA-a)) nanocomposites was developed in this research. The effect of nano-SiO2 contents on mechanical property and ballistic impact response of poly(BA-a) nanocomposites is determined for using as strike panel. Essential properties of aramid fabric reinforced polybenzoxazine/urethane (poly(BA-a/PU)) composites influenced by multiwalled carbon nanotube (MWCNT) contents is also investigated for using as support panel. From the results, the mechanical property of the nanocomposite was improved with the addition of nanoparticles. The experimental energy absorption (EAbs) and ballistic limit velocity (Vbl) of the nanocomposites were subjected by 7.62×51 mm projectile at velocity of 847 …

Computational Fluid Dynamics Of Thermally Double Couple Reactor For Hydrogen Production Through Glycerol Reforming Using Heat From Methanol Production From Carbon Dioxide, Sasinun Thirabunjongcharoen

Chulalongkorn University Theses and Dissertations (Chula ETD)

Thermally double coupled reactor (TDCR) consisted of two concentric channels: 1) an inner tube to which CO₂ and H2 were fed as reactants for exothermic MS with Cu/ZnO/Al2O3 at 220°C and 50 bar, and 2) an outer annulus channel through which glycerol and steam were supplied for endothermic APGR with Pt/Al2O3 at 220˚C and 20 bar. The TDCR could operate without external heat supply when two reactions were coupled. A computational fluid dynamic (CFD) model was established to study this TDCR. Heat transfer from the exothermic channel to the endothermic channel helped increasing glycerol conversion when compared with a single …