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Transport Properties And Strength Development Of Blended Cement Mortars Containing Nano-Silica, Ali Akbar Ramezanianpour, Sajjad Mirvalad, Mehrdad Mortezaei 2019 Concrete Technology and Durability Research Center, Amirkabir University of Technology, Tehran, Iran

Transport Properties And Strength Development Of Blended Cement Mortars Containing Nano-Silica, Ali Akbar Ramezanianpour, Sajjad Mirvalad, Mehrdad Mortezaei

International Conference on Durability of Concrete Structures

In the present study, the mechanical properties and durability of blended cement mortars containing nanosilica and natural pozzolans is investigated. Trass and pumice, two different Iranian natural pozzolan, are used in the experiments. For cement blends preparation, nano-silica replacement levels of 2, 3 and 4% by mass of cement was considered; each mixture contained one of the natural pozzolans with a fixed replacement percentage of 15. The Standard mortar samples were made with w/cm ratio of 0.485; the flow of all mortars ranged from 14 to 16 cm. All prepared mortars’ samples were cured in saturated limewater until ...


#20 - Nanocellulose Aerogel From Biomass Waste For Water Purification, Harshvardhan Singh 2019 Mercer University

#20 - Nanocellulose Aerogel From Biomass Waste For Water Purification, Harshvardhan Singh

Georgia Undergraduate Research Conference (GURC)

Purpose of the experiment: Energy cane is a perennial, non-food, low input crop popular for bioethanol production. The biomass waste (bagasse) consists up to 42% cellulose and is often underutilized. Limited research has been conducted on value added product potential of cellulose nanofibrils (CNF) utilizing energy cane. Hydrophobic CNF aerogels can selectively remove oil and other impurities from water with limited environmental impact. The purpose of this project was to synthesize aerogels from bagasse as a value-added greener product for growers involved in the biofuel industry with a potential application in water purification.

Procedure: Finely ground and dried bagasse and ...


Electroosmotic Flow Of Viscoelastic Fluid In A Nanochannel Connecting Two Reservoirs, Lanju Mei, Shizhi Qian 2019 Old Dominion University

Electroosmotic Flow Of Viscoelastic Fluid In A Nanochannel Connecting Two Reservoirs, Lanju Mei, Shizhi Qian

Mechanical & Aerospace Engineering Faculty Publications

Electroosmotic flow (EOF) of viscoelastic fluid with Linear Phan-Thien–Tanner (LPTT) constitutive model in a nanochannel connecting two reservoirs is numerically studied. For the first time, the influence of viscoelasticity on the EOF and the ionic conductance in the micro-nanofluidic interconnect system, with consideration of the electrical double layers (EDLs), is investigated. Regardless of the bulk salt concentration, significant enhancement of the flow rate is observed for viscoelastic fluid compared to the Newtonian fluid, due to the shear thinning effect. An increase in the ionic conductance of the nanochannel occurs for the viscoelastic fluid. The enhancement of the ionic conductance ...


Label-Free Microrna Optical Biosensors, Meimei Lai, Gymama Slaughter 2019 Old Dominion University

Label-Free Microrna Optical Biosensors, Meimei Lai, Gymama Slaughter

Bioelectrics Publications

MicroRNAs (miRNAs) play crucial roles in regulating gene expression. Many studies show that miRNAs have been linked to almost all kinds of disease. In addition, miRNAs are well preserved in a variety of specimens, thereby making them ideal biomarkers for biosensing applications when compared to traditional protein biomarkers. Conventional biosensors for miRNA require fluorescent labeling, which is complicated, time-consuming, laborious, costly, and exhibits low sensitivity. The detection of miRNA remains a big challenge due to their intrinsic properties such as small sizes, low abundance, and high sequence similarity. A label-free biosensor can simplify the assay and enable the direct detection ...


Top-Down And Bottom-Up Fabrication Of Key Components In Miniature Energy Storage Devices, Wenhao Li 2019 University of Massachusetts Amherst

Top-Down And Bottom-Up Fabrication Of Key Components In Miniature Energy Storage Devices, Wenhao Li

Doctoral Dissertations

The advent of miniature electronic devices demands power sources of commensurate form factors. This spurs the research of micro energy storage devices, e.g., 3D microbatteries. A 3D microbattery contains nonplanar microelectrodes with high aspect ratio and high surface area, separated by a nanoscale electrolyte. The device takes up a total volume as small as 10 mm3, allowing it to serve on a chip and to provide power in-situ. The marriage of nanotechnology and electrochemical energy storage makes microbattery research a fascinating field with both scientific excitement and application prospect. However, successful fabrication of well-functioned key components and the ...


Function And Dissipation In Finite State Automata - From Computing To Intelligence And Back, Natesh Ganesh 2019 University of Massachusetts Amherst

Function And Dissipation In Finite State Automata - From Computing To Intelligence And Back, Natesh Ganesh

Doctoral Dissertations

Society has benefited from the technological revolution and the tremendous growth in computing powered by Moore's law. However, we are fast approaching the ultimate physical limits in terms of both device sizes and the associated energy dissipation. It is important to characterize these limits in a physically grounded and implementation-agnostic manner, in order to capture the fundamental energy dissipation costs associated with performing computing operations with classical information in nano-scale quantum systems. It is also necessary to identify and understand the effect of quantum in-distinguishability, noise, and device variability on these dissipation limits. Identifying these parameters is crucial to ...


Vitamin A Deficiency Impairs The Immune Response To Intranasal Vaccination And Rsv Infection In Neonatal Calves, Jodi L. McGill, Sean M. Kelly, Mariana Guerra-Maupome, Emma Winkley, Jamie Henningson, Balaji Narasimhan, Randy E. Sacco 2019 Iowa State University

Vitamin A Deficiency Impairs The Immune Response To Intranasal Vaccination And Rsv Infection In Neonatal Calves, Jodi L. Mcgill, Sean M. Kelly, Mariana Guerra-Maupome, Emma Winkley, Jamie Henningson, Balaji Narasimhan, Randy E. Sacco

Chemical and Biological Engineering Publications

Respiratory syncytial virus (RSV) infection is a leading cause of severe acute lower respiratory tract infection in infants and children worldwide. Vitamin A deficiency (VAD) is one of the most prevalent nutrition-related health problems in the world and is a significant risk factor in the development of severe respiratory infections in infants and young children. Bovine RSV (BRSV) is a primary cause of lower respiratory tract disease in young cattle. The calf model of BRSV infection is useful to understand the immune response to human RSV infection. We have previously developed an amphiphilic polyanhydride nanoparticle (NP)-based vaccine (i.e ...


Beyond The Toolpath: Site-Specific Melt Pool Size Control Enables Printing Of Extra-Toolpath Geometry In Laserwire-Based Directed Energy Deposition, Brian T. Gibson, Bradley S. Richardson, Tayler W. Undermann, Lonnie J. Love 2019 Oak Ridge National Laboratory

Beyond The Toolpath: Site-Specific Melt Pool Size Control Enables Printing Of Extra-Toolpath Geometry In Laserwire-Based Directed Energy Deposition, Brian T. Gibson, Bradley S. Richardson, Tayler W. Undermann, Lonnie J. Love

Mechanical & Materials Engineering Faculty Publications

A variety of techniques have been utilized in metal additive manufacturing (AM) for melt pool size management, including modeling and feed-forward approaches. In a few cases, closed-loop control has been demonstrated. In this research, closed-loop melt pool size control for large-scale, laser wire-based directed energy deposition is demonstrated with a novel modification, i.e., site-specific changes to the controller setpoint were commanded at trigger points, the locations of which were generated by the projection of a secondary geometry onto the primary three-dimensional (3D) printed component geometry. The present work shows that, through this technique, it is possible to print a ...


Influence Of Flow Rate, Nozzle Speed, Pitch And The Number Of Passes On The Thickness Of S1805 Photoresist In Suss Microtec As8 Spray Coater, Rohan Sanghvi, Gyuseok Kim 2019 Singh Center for Nanotechnology

Influence Of Flow Rate, Nozzle Speed, Pitch And The Number Of Passes On The Thickness Of S1805 Photoresist In Suss Microtec As8 Spray Coater, Rohan Sanghvi, Gyuseok Kim

Tool Data

S1805 positive photoresist has been deposited on single crystalline Si wafers using a Suss MicroTec Alta Spray. The influence of flow rate, nozzle speed, pitch and number of passes on the thickness of the photoresist was studied. Results show that the thickness of S1805 is linearly proportional to the flow rate and number of passes, and inversely proportional to the nozzle speed and pitch.


Development And Optimization Of Ph-Responsive Plga-Chitosan Nanoparticles For Triggered Release Of Antimicrobials, Cicero C. Pola, Allan R.F. Moraes, Eber A.A. Medeiros, Reinaldo F. Teófilo, Nilda F.F. Soares, Carmen L. Gomes 2019 Iowa State University and Federal University of Viçosa

Development And Optimization Of Ph-Responsive Plga-Chitosan Nanoparticles For Triggered Release Of Antimicrobials, Cicero C. Pola, Allan R.F. Moraes, Eber A.A. Medeiros, Reinaldo F. Teófilo, Nilda F.F. Soares, Carmen L. Gomes

Mechanical Engineering Publications

The aim of this work was to develop and optimize a pH-responsive nanoparticle based on poly(D,L-lactide-co-glycolide) (PLGA) and chitosan (CHIT) for delivery of natural antimicrobial using trans-cinnamaldehyde (TCIN) as a model compound. The optimization was performed using a central composite design and the desirability function approach. The optimized levels of variables considering all significant responses were 4% (w/w) of TCIN and 6.75% (w/w) of CHIT. After, optimized nanoparticles were produced and characterized according to their physicochemical properties and their antimicrobial activity against SalmonellaTyphimurium and Staphylococcus aureus. Optimized nanoparticles characterization indicated a satisfactory TCIN ...


Diagnostic Sequence Detection Against A Complex Background Using A Dna Molecular Computation Framework, Adan Leon Myers y Gutierrez 2019 University of New Mexico - Main Campus

Diagnostic Sequence Detection Against A Complex Background Using A Dna Molecular Computation Framework, Adan Leon Myers Y Gutierrez

Nanoscience and Microsystems ETDs

Diagnostic assays are designed to detect a unique analyte profile in a disease of interest. Nucleic acids contain an information-dense sequence, and thus are ideal candidates for unique analytes. The gold-standard of nucleic-acid-based detection is PCR which has high sensitivity, but involves time, expertise, and cost. DNA molecular logic technology holds much promise as an alternative molecular detection method due to the potential to save cost and expertise, while also achieving a high sensitivity. However, nucleic acid detection in biomedical applications carries with it the difficulty of choice of appropriate sequence and potential biological sample background.

This work describes the ...


Effect Of Silica Fume In Concrete On Mechanical Properties And Dynamic Behaviors Under Impact Loading, Shijun Zhao, Qing Zhang 2019 Hohai University & University of Nebraska-Lincoln

Effect Of Silica Fume In Concrete On Mechanical Properties And Dynamic Behaviors Under Impact Loading, Shijun Zhao, Qing Zhang

Mechanical & Materials Engineering Faculty Publications

The effect of silica fume (SF) in concrete on mechanical properties and dynamic behaviors was experimentally studied by split Hopkinson pressure bar (SHPB) device with pulse shaping technique. Three series of concrete with 0, 12%, and 16% SF as a cement replacement by weight were produced firstly. Then the experimental procedure for dynamic tests of concrete specimens with SF under a high loading rate was presented. Considering the mechanical performance and behaviors of the concrete mixtures, those tests were conducted under five different impact velocities. The experimental results clearly show concrete with different levels of SF is a strain-rate sensitive ...


Complex Oscillatory Decrease With Size In Diffusivity Of {100}-Epitaxially Supported 3d Fcc Metal Nanoclusters, King C. Lai, James W. Evans 2019 Iowa State University and Ames Laboratory

Complex Oscillatory Decrease With Size In Diffusivity Of {100}-Epitaxially Supported 3d Fcc Metal Nanoclusters, King C. Lai, James W. Evans

Ames Laboratory Accepted Manuscripts

Diffusion and coalescence of supported 3D metal nanoclusters (NCs) leads to Smoluchowski Ripening (SR), a key pathway for catalyst degradation. Variation of the NC diffusion coefficient, DN, with size N (in atoms) controls SR kinetics. Traditionally, a form DN ∼ N−β was assumed consistent with mean-field analysis. However, KMC simulation of a stochastic model for diffusion of {100}-epitaxially supported fcc NCs mediated by surface diffusion reveals instead a complex oscillatory decrease of DN with N. Barriers for surface diffusion of metal atoms across and between facets, along step edges, etc., in this model are selected to accurately capture behavior ...


Surface Acoustic Wave Spectroscopy Versus Nanoindentation: Potentials And Limits For Coating Characterization, Martin Zawischa, Dieter Schneider, Stefan, Makowski, Lars Lorenz 2019 Fraunhofer Institute for Material and Beam Technology IWS, Germany

Surface Acoustic Wave Spectroscopy Versus Nanoindentation: Potentials And Limits For Coating Characterization, Martin Zawischa, Dieter Schneider, Stefan, Makowski, Lars Lorenz

Nanomechanical Testing in Materials Research and Development VII

Measuring mechanical film properties is essential for understanding and designing coating systems as well for controlling quality in coating manufacturing. Since more than two decades, two methods for determining Young’s modulus and other mechanical properties of thin films are widely used: The instrumented indentation technique (nanoindentation) and the laser-induced surface acoustic wave spectroscopy (LiSAWS). Due to their different physical principles, both methods address different fields of application but also complement each other. This presentation gives an overview for typical applications, strengths and limits for both methods from practical points of view like precision, requirements for sample material, preparation and ...


Laser-Spark Multicharged Ion Implantation System ‒ Application In Ion Implantation And Neural Deposition Of Carbon In Nickel (111), Oguzhan Balki 2019 Old Dominion University

Laser-Spark Multicharged Ion Implantation System ‒ Application In Ion Implantation And Neural Deposition Of Carbon In Nickel (111), Oguzhan Balki

Electrical & Computer Engineering Theses & Disssertations

Carbon ions generated by ablation of a carbon target using an Nd:YAG laser pulse (wavelength λ = 1064 nm, pulse width τ = 7 ns, and laser fluence of 10-110 J/cm2) are characterized. Time-of-flight analyzer, a three-mesh retarding field analyzer, and an electrostatic ion energy analyzer are used to study the charge and energy of carbon ions generated by laser ablation. The dependencies of the ion signal on the laser fluence, laser focal point position relative to target surface, and the acceleration voltage are described. Up to C4+ are observed. When no acceleration voltage is applied between the ...


A Multicarrier Technique For Monte Carlo Simulation Of Electrothermal Transport In Nanoelectronics, Tyler J. Spence 2019 Louisiana Tech University

A Multicarrier Technique For Monte Carlo Simulation Of Electrothermal Transport In Nanoelectronics, Tyler J. Spence

Doctoral Dissertations

The field of microelectronics plays an important role in many areas of engineering and science, being ubiquitous in aerospace, industrial manufacturing, biotechnology, and many other fields. Today, many micro- and nanoscale electronic devices are integrated into one package. e capacity to simulate new devices accurately is critical to the engineering design process, as device engineers use simulations to predict performance characteristics and identify potential issues before fabrication. A problem of particular interest is the simulation of devices which exhibit exotic behaviors due to non-equilibrium thermodynamics and thermal effects such as self-heating. Frequently, it is desirable to predict the level of ...


Application Of Halloysite Nanotubes In Bone Disease Remediation And Bone Regeneration, Yangyang Luo 2019 Louisiana Tech University

Application Of Halloysite Nanotubes In Bone Disease Remediation And Bone Regeneration, Yangyang Luo

Doctoral Dissertations

Customized patient therapy has been a major research focus in recent years. There are two research fields that have made a significant contribution to realizing individualized-based treatment: targeted drug delivery and three-dimensional (3D) printing technology. With benefit from the advances in nanotechnology and biomaterial science, various drug delivery systems have been established to provide precise control of therapeutic agents release in time and space. The emergence of three-dimensional (3D) printing technology enables the fabrication of complicated structures that effectively mimic native tissues and makes it possible to print patient-specific implants. My dissertation research used a clay nanoparticle, halloysite, to develop ...


Quantifying The Effects Of Hyperthermal Atomic Oxygen And Thermal Fatigue Environments On Carbon Nanotube Sheets For Space-Based Applications, Jacob W. Singleton, Gregory R. Cobb, Heath E. Misak, Ryan A. Kemnitz 2019 Air Force Institute of Technology

Quantifying The Effects Of Hyperthermal Atomic Oxygen And Thermal Fatigue Environments On Carbon Nanotube Sheets For Space-Based Applications, Jacob W. Singleton, Gregory R. Cobb, Heath E. Misak, Ryan A. Kemnitz

Faculty Publications

The effects of atomic oxygen and thermal fatigue on two different types of carbon nanotube sheets were studied. One set was treated with nitric acid, while the other set was left untreated. Monotonic tensile tests were performed before and after exposure to determine the effects of either exposure type on the sheets’ mechanical properties. Electrical conductivity and electromagnetic interference measurements were recorded to determine the effects of AO-exposure and thermal cycling on the sheets’ electrical properties. Neither exposure type affected the sheets’ specific strengths. Both exposure types increased the sheets’ specific stiffnesses and decreased the sheets’ strains at failure. The ...


Algorithmic Aspects And Finite Element Solutions For Advanced Phase Field Approach To Martensitic Phase Transformation Under Large Strains, Hamed Babaei, Anup Basak, Valery I. Levitas 2019 Iowa State University

Algorithmic Aspects And Finite Element Solutions For Advanced Phase Field Approach To Martensitic Phase Transformation Under Large Strains, Hamed Babaei, Anup Basak, Valery I. Levitas

Aerospace Engineering Publications

A new problem formulation and numerical algorithm for an advanced phase-field approach (PFA) to martensitic phase transformation (PT) are presented. Finite elastic and transformational strains are considered using a fully geometrically-nonlinear formulation, which includes different anisotropic elastic properties of phases. The requirements for the thermodynamic potentials and transformation deformation gradient tensor are advanced to reproduce crystal lattice instability conditions under a general stress tensor obtained by molecular dynamics (MD) simulations. The PFA parameters are calibrated, in particular, based on the results of MD simulations for PTs between semiconducting Si I and metallic Si II phases under complex action of all ...


Effect Of Anisotropic Elasticity On Dislocation Pile-Ups At Grain Boundaries, Xiaolei Chen, Stéphane Berbenni, Christian Motz, Thiebaud Richeton 2019 Université de Lorraine, CNRS, Arts et Métiers ParisTech, France

Effect Of Anisotropic Elasticity On Dislocation Pile-Ups At Grain Boundaries, Xiaolei Chen, Stéphane Berbenni, Christian Motz, Thiebaud Richeton

Nanomechanical Testing in Materials Research and Development VII

This study deals with in-situ micromechanical tests of micron-sized bi-crystals and observations coupling SEM, AFM and EBSD. Different FCC bi-crystals are obtained from FIB machining. A SEM in-situ compression test with a low strain is performed on a micron-sized bi-crystal in order to induce single slip deformation. Spatial variations in the surface step height due to dislocation activity in localized slip bands terminating at the grain boundary (GB) are measured by AFM. This allows the determination of the Burgers vector distribution and hence the dislocation positions in the pile-up as shown in Figure 1. Furthermore, local misorientation along slip bands ...


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