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Development Of Carbon Fiber-Modified Electrically Conductive Concrete For Implementation In Des Moines International Airport, Alireza Sassani, Halil Ceylan, Sunghwan Kim, Ali Arabzadeh, Peter C. Taylor, Kasthurirangan Gopalakrishnan 2018 Iowa State University

Development Of Carbon Fiber-Modified Electrically Conductive Concrete For Implementation In Des Moines International Airport, Alireza Sassani, Halil Ceylan, Sunghwan Kim, Ali Arabzadeh, Peter C. Taylor, Kasthurirangan Gopalakrishnan

Civil, Construction and Environmental Engineering Publications

This paper reports on the procedures of mix design preparation, production, placement, and performance evaluation of the first electrically conductive concrete (ECON) heated-pavement system (HPS) implemented at a U.S. airport. While ECON has drawn considerable attention as a paving material for multi-functional pavements, including HPS, the majority of ECON HPS applications and studies have been limited to laboratory scale or include materials/methods that do not conform to regulations enforced by airfield construction practices. Carbon fiber-reinforced ECON provides a promising prospective for application in airfield pavements. In this study, ECON mixtures were prepared in the laboratory using varying cementitious ...


Voltage-Controlled Deposition Of Nanoparticles For Next Generation Electronic Materials, Subhodip Maulik 2018 Louisiana State University and Agricultural and Mechanical College

Voltage-Controlled Deposition Of Nanoparticles For Next Generation Electronic Materials, Subhodip Maulik

LSU Doctoral Dissertations

This work presents both a feasibility study and an investigation into the voltage-controlled spray deposition of different nanoparticles, namely, carbon nanotubes (CNTs), as well as molybdenum disulfide (MoS2) and tungsten disulfide (WS2) from the transition metal dichalcogenides (TMDCs) family of materials. The study considers five different types of substrates as per their potential application to next-generation device electronics. The substrates selected for this research were: 1) aluminum as a conducting substrate, 2) silicon as a semiconducting substrate, 3) glass, silicon dioxide (SiO2), and syndiotactic poly methyl methacrylate (syndiotactic PMMA) as insulating substrates.

Since the 1990’s, carbon ...


Polymer Nanocomposites Containing High Aspect Ratio Particulates: Innovation In Co-Extruded Multilayer Barrier Films, Kevin Meyers 2018 The University of Southern Mississippi

Polymer Nanocomposites Containing High Aspect Ratio Particulates: Innovation In Co-Extruded Multilayer Barrier Films, Kevin Meyers

Dissertations

Delaminated montmorillonite (MMT) clay/ maleic anhydride grafted LLDPE nanocomposite multilayer films with alternating layers of LDPE were produced through multilayer co-extrusion. The MMT concentration within the nanocomposite layers was increased through annealing the films in the melt due to a mismatch in interdiffusion rates of the polymer layers. Analysis of the nanocomposite layers upon annealing revealed that the platelets impinged upon one another resulting in significant improvement in oxygen barrier in the multilayer system, exceeding the results of bulk nanocomposites.

Model analysis demonstrated that increasing the nanoplatelet aspect ratio or initial concentration in the filled layers would lead to even ...


Mesoscale Computational Studies Of Thin-Film Bijels, Joseph M. Carmack 2018 University of Arkansas, Fayetteville

Mesoscale Computational Studies Of Thin-Film Bijels, Joseph M. Carmack

Theses and Dissertations

Bijels are a relatively new class of soft materials that have many potential applications in the technology areas of energy, medicine, and environmental sustainability. They are formed by the arrest of binary liquid spinodal decomposition by a dispersion of solid colloidal nanoparticles. This dissertation presents an in-depth simulation study of Bijels constrained to thin-film geometries and in the presence of electric fields. We validate the computational model by comparing simulation results with previous computational modeling and experimental research. In the absence of suspended particles, we demonstrate that the model accurately captures the rich kinetics associated with diffusion-based surface-directed spinodal decomposition ...


Structure And Property Of Polymers And Biopolymers From Molecular Dynamic Simulations, Xiaoquan Sun 2018 University of Arkansas, Fayetteville

Structure And Property Of Polymers And Biopolymers From Molecular Dynamic Simulations, Xiaoquan Sun

Theses and Dissertations

Natural and synthetic polymers and biopolymers have been studied for a variety of applications in food emulsion, biopharmaceutical purification, tissue engineering, and biosensor. The structure and property of polymers and biopolymers are critically important to determine their functions. Molecular dynamics (MD) simulations have a unique advantage to explore the structure and property of polymers and biopolymers from the molecular level. In the dissertation, MD simulations were conducted to study the mechanisms of various biological and chemical processes controlled by polymers and biopolymers based on real-world experimental results.

Seven heptapeptides have been screened from a peptide library in our earlier study ...


Effects Of Surface-Directed Spinodal Decomposition On Binary Thin-Film Morphology, Michael Brian Wise 2018 University of Arkansas, Fayetteville

Effects Of Surface-Directed Spinodal Decomposition On Binary Thin-Film Morphology, Michael Brian Wise

Theses and Dissertations

Preferential wetting can have a significant impact on the kinetics of phase separation in

certain systems. The depletion of the wetting component can simply alter domain growth

rates or change the structure entirely. In this thesis, we employ a Cahn-Hilliard model to

study the evolution of binary thin-films with symmetric surface wetting. Three possible

morphologies were identified: discrete, bicontinuous, and a novel quasi-2D bicontinuous

structure in which both phases retain continuity throughout the volume as well as on

the center xy plane. Using a continuity factor, regions of film thickness versus blend

composition were classified as producing a certain morphology ...


Self-Assembled Barium Titanate Nanoscale Films By Molecular Beam Epitaxy, Timothy Allen Morgan 2018 University of Arkansas, Fayetteville

Self-Assembled Barium Titanate Nanoscale Films By Molecular Beam Epitaxy, Timothy Allen Morgan

Theses and Dissertations

One challenge of investigating ferroelectrics at the nanoscale has been controlling the stoichiometry during growth. Historically, the growth of barium titanate (BaTiO3) by molecular beam epitaxy has relied on a growth technique called shuttered RHEED. Shuttered RHEED controls the stoichiometry of barium titanate through the precise deposition of alternating layers of BaO and TiO2. While this approach has achieved 1% control of stoichiometry, finding self-limiting mechanisms to lock-in stoichiometry has been the focus of the growth community. The Goldschmidt tolerance factor predicts an unstable perovskite when barium sits in the titanium lattice site. The BaO-TiO2 phase diagram predicts a low-solubility ...


Development And Applications Of Polyglyoxylate Self-Immolative Polymers, Bo Fan 2018 The University of Western Ontario

Development And Applications Of Polyglyoxylate Self-Immolative Polymers, Bo Fan

Electronic Thesis and Dissertation Repository

Self-immolative polymers (SIPs) are relatively recent class of stimuli-responsive and degradable polymers that have attracted significant attention in the past several years. SIPs consist of polymer backbones and stimuli-responsive end-caps at one or both polymer termini. Upon detection of a stimulus, the decomposition of the end-cap leads to complete end-to-end depolymerization. Polyglyoxylates were introduced as a new class of polyacetal based SIPs by our group in 2014. Compared with other SIPs, polyglyoxylates have two advantages including: 1) readily available monomers and 2) low toxic depolymerization products. These advantages may allow polyglyoxylates to be used in a wide range of applications ...


Fabrication Of 3d Conjugated Polymer Structures Via Vat Polymerization Additive Manufacturing, Andrew T. Cullen 2018 The University of Western Ontario

Fabrication Of 3d Conjugated Polymer Structures Via Vat Polymerization Additive Manufacturing, Andrew T. Cullen

Electronic Thesis and Dissertation Repository

Conjugated polymers are a class of electromechanically active materials that can produce motion in response to an electric potential. This motion can be harnessed to perform mechanical work, and therefore these materials are particularly well suited for use as sensors and actuators in microelectromechanical systems. Conventional methods to fabricate conjugated polymer actuators result in planar morphologies that limit fabricated devices to simplistic linear or bending actuation modes. To overcome this limitation, this work develops a conjugated polymer formulation and associated additive manufacturing method capable of realizing three-dimensional conductive polymer structures. A light-based additive manufacturing technique known as vat polymerization is ...


The Application Of The Peleg Model In Order To Obtain Completely Soluble Materials For Food Product Packaging, Roxana Puscaselu (Gheorghita), Sonia Amariei 2018 Stefan cel Mare University

The Application Of The Peleg Model In Order To Obtain Completely Soluble Materials For Food Product Packaging, Roxana Puscaselu (Gheorghita), Sonia Amariei

Journal of Applied Packaging Research

The aim of this study was to create a completely hydrosoluble edible films based on biopolymers that can be used as packaging material for powdered foods.10 edible films were obtained from various mixtures of hydrocolloids (agar, starch, sodium alginate) plasticized with glycerol and water. To assess their solubility, it was used the Peleg model which confirmed that increasing the temperature of the hydration medium, increases the water absorption rate. The sample obtained from agar and starch was less hydrophilic than sample with a high amount of sodium alginate, which was completely soluble after 3 minutes maintenance in 20° water ...


Review Of Challenges And Advances In Modification Of Food Package Headspace Gases, Ziynet Boz, Bruce A. Welt, Jeffrey K. Brecht, William Pelletier, Eric McLamore, Gregory A. Kiker, Jason E. Butler 2018 University of Florida

Review Of Challenges And Advances In Modification Of Food Package Headspace Gases, Ziynet Boz, Bruce A. Welt, Jeffrey K. Brecht, William Pelletier, Eric Mclamore, Gregory A. Kiker, Jason E. Butler

Journal of Applied Packaging Research

Modified Atmosphere Packaging (MAP) has been widely used as an effective way to preserve foods. Fresh produce, meat and meat products, seafood, and dairy products can benefit from modified gaseous atmospheres, which are usually achieved by reducing oxygen and increasing carbon dioxide concentrations, within limits, defined by product tolerances. MAP of fresh produce is particularly challenging because products are living and respiring. Respiration rates depend on several factors including temperature, oxygen, and carbon dioxide concentrations. Balancing package permeation with respiration is challenging, often due to limited selection of practical packaging materials. Failing to remain within tolerance limits of products leads ...


Waste Management By Waste: Removal Of Acid Dyes From Wastewaters Of Textile Coloration Using Fish Scales, S M Fijul Kabir 2018 Louisiana State University

Waste Management By Waste: Removal Of Acid Dyes From Wastewaters Of Textile Coloration Using Fish Scales, S M Fijul Kabir

LSU Master's Theses

Removal of hazardous acid dyes by economical process using low-cost bio-sorbents from wool industry wastewaters is of a pressing need, since it causes skin and respiratory diseases and disrupts other environmental components. Fish scales (FS), a by-product of fish industry, a type of solid waste, are usually discarded carelessly resulting in pungent odor and environmental burden. In this research, the FS of black drum (Pogonias cromis) were used for the removal of acid dyes (acid red 1 (AR1), acid blue 45 (AB45) and acid yellow 127 (AY126)) from wool industry wastewaters by absorption process with a view to valorizing fish ...


Materials Design With Polylactic Acid-Polyethylene Glycol Blends Using 3d Printing And For Medical Applications., Jeremiah R. Bauer 2018 University of Louisville

Materials Design With Polylactic Acid-Polyethylene Glycol Blends Using 3d Printing And For Medical Applications., Jeremiah R. Bauer

Electronic Theses and Dissertations

This thesis is an examination of two material systems derived from polylactic acid (PLA) and polyethylene glycol (PEG). PLA is a polymer commonly sourced from renewable sources such as starches and sugars. It is a relatively strong, biodegradable polymer, making it ideal for use in the body. Even though it has a relative high strength, PLA is also brittle leading to the use of plasticizers to increase flexibility. One such plasticizer is PEG, which is a material that can exist at room temperature as either a thin liquid, or a hard waxy solid depending on the molecular weight. The first ...


Communication And Biodegradable Packaging Relationship: A Paradigm For Final Disposal, Breno Luiz Ottoni, Rafael Mattos Deus, José Alcides Gobbo Junior, Ângela Maria Grossi de Carvalho, Rosane Aparecida Gomes Battistelle 2018 São Paulo State University - UNESP

Communication And Biodegradable Packaging Relationship: A Paradigm For Final Disposal, Breno Luiz Ottoni, Rafael Mattos Deus, José Alcides Gobbo Junior, Ângela Maria Grossi De Carvalho, Rosane Aparecida Gomes Battistelle

Journal of Applied Packaging Research

Solid waste generation is estimated to increase from 1.3 billion to 2.2 billion tons by 2025, causing environmental, social, and consequently public health problems. The biggest problem in this regard involves the inadequate disposal of waste, and in emerging countries like Brazil, it is sorted less waste for recycling or composting. In this context, plastic packaging is more complex due to the high polymer composition, as well as low recycling rates. Bioplastics appear as alternatives because they are mostly biodegradable. Given the various functions of packaging and a systematic review of the literature, the aim of this study ...


Printed Graphene Electrochemical Biosensors Fabricated By Inkjet Maskless Lithography For Rapid And Sensitive Detection Of Organophosphates, John A. Hondred, Joyce C. Breger, Nathan J. Alves, Scott A. Trammell, Scott A. Walper, Igor L. Medintz, Jonathan C. Claussen 2018 Iowa State University

Printed Graphene Electrochemical Biosensors Fabricated By Inkjet Maskless Lithography For Rapid And Sensitive Detection Of Organophosphates, John A. Hondred, Joyce C. Breger, Nathan J. Alves, Scott A. Trammell, Scott A. Walper, Igor L. Medintz, Jonathan C. Claussen

Mechanical Engineering Publications

Solution phase printing of graphene-based electrodes has recently become an attractive low-cost, scalable manufacturing technique to create in-field electrochemical biosensors. Here we report a graphene-based electrode developed via Inkjet Maskless Lithography (IML) for the direct and rapid monitoring of triple-O linked phosphonate organophosphates (OPs); these constitute the active compounds found in chemical warfare agents and pesticides that exhibit acute toxicity as well as long-term pollution to soils and waterways. The IML printed graphene electrode is nano/microstructured with a 1000 mW benchtop laser engraver and electrochemically deposited platinum nanoparticles (dia. ~25 nm) to improve its electrical conductivity (sheet resistance decreased ...


Covalently Crosslinked Organic/Inorganic Hybrid Biomaterials For Bone Tissue Engineering Applications, Dibakar Mondal 2018 The University of Western Ontario

Covalently Crosslinked Organic/Inorganic Hybrid Biomaterials For Bone Tissue Engineering Applications, Dibakar Mondal

Electronic Thesis and Dissertation Repository

Scaffolds are key components for bone tissue engineering and regeneration. They guide new bone formation by mimicking bone extracellular matrix for cell recruitment and proliferation. Ideally, scaffolds for bone tissue engineering need to be osteoconductive, osteoinductive, porous, degradable and mechanically competent. As a single material can not provide all these requirements, composites of several biomaterials are viable solutions to combine various properties. However, conventional composites fail to fulfil these requirements due to their distinct phases at the microscopic level. Organic/inorganic (O/I) class II hybrid biomaterials, where the organic and inorganic phases are chemically crosslinked on a molecular scale ...


Modeling The Interphase Of A Polymer-Based Nanodielectric, Connor S. Daily, Weixing Sun, Michael R. Kessler, Xiaoli Tan, Nicola Bowler 2018 Iowa State University

Modeling The Interphase Of A Polymer-Based Nanodielectric, Connor S. Daily, Weixing Sun, Michael R. Kessler, Xiaoli Tan, Nicola Bowler

Xiaoli Tan

A three-phase theoretical model is proposed that is suitable for describing the effective permittivity of polymer-matrix composites containing spherical nanoparticles. The model accounts for the presence of an interphase region, which surrounds each nanosphere, whose permittivity is allowed to be different from that of the matrix polymer. The nanoparticles themselves are approximated as hard (non-overlapping) spheres, whereas the interphase regions of neighboring nanoparticles are permitted to overlap. The volume fraction of the interphase region is computed by assuming that the nanoparticles are arranged on the nodes of a simple-cubic lattice. The effective permittivity of the composite is subsequently computed via ...


Depolymerization Of Post-Consumer Polylactic Acid Products, David A. Grewell, Gowrishankar Srinivasan, Eric W. Cochran 2018 Iowa State University

Depolymerization Of Post-Consumer Polylactic Acid Products, David A. Grewell, Gowrishankar Srinivasan, Eric W. Cochran

Eric W. Cochran

Presented in this study is a novel recycling strategy for poly(lactic acid) (PLA) in which the depolymerization is rapidly promoted by the base–catalyzed hydrol–/alcohol–ysis of the terminal ester bonds under mild conditions. Post–consumer PLA water bottles were cut into approximately 6 × 2 mm plastic chips and heated to 50–60×C in water, ethanol, or methanol as the depolymerization medium. A variety of carbonate salts and alkaline metal oxides were screened as potential catalysts. High–power ultrasound was also investigated as a means to accelerate the PLA decomposition. Both mass loss and HPLC analysis of ...


Synthesis And Functionalization Of Virus-Mimicking Cationic Block Copolymers With Pathogen-Associated Carbohydrates As Potential Vaccine Adjuvants, J. R. Adams, M. Goswami, N. L.B. Pohl, Surya K. Mallapragada 2018 Iowa State University

Synthesis And Functionalization Of Virus-Mimicking Cationic Block Copolymers With Pathogen-Associated Carbohydrates As Potential Vaccine Adjuvants, J. R. Adams, M. Goswami, N. L.B. Pohl, Surya K. Mallapragada

Surya K. Mallapragada

We report the synthesis of a family of amphiphilic pentablock polymers with different cationic blocks and with controlled architectures as potential vaccine carriers for subunit vaccines. The temperature and pH-dependent micellization and gelation of these pentablock copolymers can provide a depot for sustained protein and gene delivery. The amphiphilic central triblock promotes cellular endocytosis, good gene delivery and has been used effectively as a vaccine adjuvant. The pentablock copolymer outer blocks condense DNA spontaneously as a result of electrostatic interactions for sustained combinational therapy. This family of polymers with different cationic groups was evaluated based on DNA complexation-ability and cytotoxicity ...


Protein Patterns Template Arrays Of Magnetic Nanoparticles, Srikanth Nayak, Honghu Zhang, Xunpei Liu, Shuren Feng, Pierre Palo, Marit Nilsen-Hamilton, Mufit Akinc, Surya K. Mallapragada 2018 Iowa State University and Ames Laboratory

Protein Patterns Template Arrays Of Magnetic Nanoparticles, Srikanth Nayak, Honghu Zhang, Xunpei Liu, Shuren Feng, Pierre Palo, Marit Nilsen-Hamilton, Mufit Akinc, Surya K. Mallapragada

Surya K. Mallapragada

Controlling the morphology of magnetic nanoparticles and their spatial arrangement is crucial for manipulating their functional properties. The commonly available inorganic processes for the synthesis of uniform magnetic nanoparticles typically require extreme reaction conditions such as high temperatures or harsh reagents, rendering them unsuitable for making functionalized magnetic nanoparticles with tunable properties controlled by biomolecules. Biomimetic procedures, inspired by the production of uniform magnetite and greigite crystals in magnetotactic bacteria, provide an alternative method, which can allow synthesis and spatial arrangement under ambient conditions. Mms6, an amphiphilic protein found in magnetosome membranes in Magnetospirillum magneticum strain AMB-1, can control the ...


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