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Physico-Chemical Properties Of Hydrogel Based On 1-Chloro-3-Piperidino-2-Propylacrylate, Pulatova Nilufar, Maksumova Oytura 2019 Tashkent Chemical-Technological Institute, Uzbekistan

Physico-Chemical Properties Of Hydrogel Based On 1-Chloro-3-Piperidino-2-Propylacrylate, Pulatova Nilufar, Maksumova Oytura

CHEMISTRY AND CHEMICAL ENGINEERING

In the article the results of synthesis of the reticulated high molecular connection are rotined on the basis of 1-khlor-3-piperidin-2-propilakrilata, his structure and properties. Influence of different factors is studied on the process of receipt of hydrogel. Physical and chemical properties of polymer are studied on the basis of 1-khlor-3-piperidin-2-propilakrilata, swelling speed in water and different environments. A change speed of swelling of hydrogel is rotined from acid and alkaline terms, that them it is possible to vary. A change swelling speed depending on a temperature was studied at different temperatures and it is rotined that with the increase of ...


Micro-Mechanical Analysis Of Corrosion Products Formed During Long-Term Carbonation Induced Corrosion Of Steel, Marijana Serdar, Dubravka Bjegovic, Valérie L’Hostis, Stéphane Poyet, Damien Féron 2019 Faculty of Civil Engineering, University of Zagreb

Micro-Mechanical Analysis Of Corrosion Products Formed During Long-Term Carbonation Induced Corrosion Of Steel, Marijana Serdar, Dubravka Bjegovic, Valérie L’Hostis, Stéphane Poyet, Damien Féron

International Conference on Durability of Concrete Structures

During corrosion distinct types of corrosion products form, composed of different ratios of ferrous ions and oxide, hydroxides. Corrosion products have different physical and mechanical properties, mainly density, resistivity, volume and modulus of elasticity compared to iron. Knowing properties of corrosion products is indispensable for service life modelling of structures and can give valuable insight into the long-term corrosion propagation process. In this study micro-indentation method was used to evaluate mechanical properties of different layers formed during long-term carbonation induced corrosion of steel in concrete. Investigation was performed on three sets of reinforced concrete samples, that underwent corrosion during 50 ...


Development Of Engineered Cementitious Composites With Conductive Inclusions For Use In Self-Sensing Applications, Benny Suryanto Dr, Danah Saraireh Ms, Steven Walls Mr, Jaehwan Kim Dr, W John McCarter Prof 2019 Heriot-Watt University

Development Of Engineered Cementitious Composites With Conductive Inclusions For Use In Self-Sensing Applications, Benny Suryanto Dr, Danah Saraireh Ms, Steven Walls Mr, Jaehwan Kim Dr, W John Mccarter Prof

International Conference on Durability of Concrete Structures

The mechanical and a.c. electrical properties of a new varietal of engineered cementitious composite (ECC) incorporating conductive inclusions are presented. Electrical measurements were undertaken over a wide frequency range while curing and when under uniaxial tensile loading to study the influence of ongoing hydration and multiple microcrack formation on the composite electrical impedance. When presented in Nyquist format, the work shows that conductive inclusions reduce the bulk resistance of the composite while enhancing its polarizability, transforming the classic, single-arc bulk response of typical cement-based materials to a two-arc response. The bulk resistance was shown to increase with time and ...


Why The Crackling Deformations Of Single Crystals, Metallic Glasses, Rock, Granular Materials, And The Earth’S Crust Are So Surprisingly Similar, Karin A. Dahmen, Jonathan T. Uhl, Wendelin J. Wright 2019 University of Illinois at Urbana-Champaign

Why The Crackling Deformations Of Single Crystals, Metallic Glasses, Rock, Granular Materials, And The Earth’S Crust Are So Surprisingly Similar, Karin A. Dahmen, Jonathan T. Uhl, Wendelin J. Wright

Faculty Journal Articles

Recent experiments show that the deformation properties of a wide range of solid materials are surprisingly similar. When slowly pushed, they deform via intermittent slips, similar to earthquakes. The statistics of these slips agree across vastly different structures and scales. A simple analytical model explains why this is the case. The model also predicts which statistical quantities are independent of the microscopic details (i.e., they are "universal"), and which ones are not. The model provides physical intuition for the deformation mechanism and new ways to organize experimental data. It also shows how to transfer results from one scale to ...


Inkjet Printing Of Magnetic Particles Toward Anisotropic Magnetic Properties, Karam Nashwan Al-Milaji, Ravi L. Hadimani, Shalabh Gupta, Vitalij K. Pecharsky, Hong Zhao 2019 Virginia Commonwealth University

Inkjet Printing Of Magnetic Particles Toward Anisotropic Magnetic Properties, Karam Nashwan Al-Milaji, Ravi L. Hadimani, Shalabh Gupta, Vitalij K. Pecharsky, Hong Zhao

Ames Laboratory Accepted Manuscripts

Unique properties of one-dimensional assemblies of particles have attracted great attention during the past decades, particularly with respect to the potential for anisotropic magnetism. Patterned films can be created using inkjet printing; however, drying of particle-laden colloidal droplets on solid surfaces is usually accompanied by the well-known coffee-ring effect, deteriorating both the uniformity and resolution of the printed configurations. This study examines the effect of externally applied magnetic field on particle deposition patterns. Ferromagnetic Gd5Si4 particles were formulated in terpineol oil and directly deposited via magnetic field-assisted inkjet printing on a photopaper to generate patterned films with suppressed coffee-ring effect ...


Mechanical And Microstructure Characteristics Of Concrete-Mixtures Designed For Durability Of Rc-Structures In Corrosive Environment, SAEID A. ALGHAMDI Dr., S. Ahmad, M. M. Khaled 2019 King Fahd Univ. of Petroleum & Minerals

Mechanical And Microstructure Characteristics Of Concrete-Mixtures Designed For Durability Of Rc-Structures In Corrosive Environment, Saeid A. Alghamdi Dr., S. Ahmad, M. M. Khaled

International Conference on Durability of Concrete Structures

As exposures to chloride-salts are known as prime factors causing initiation and continuity of corrosion-process of steel reinforcement bars in reinforced concrete (RC) structures, it has always been a major concern for designers considering the requirements of structural-durability for targeted-service life of RC-structures in aggressively corrosive environments typically prevalent in coastal regions. Research works previously reported by the researchers have modeled corrosion-process in terms of corrosion-current density, and it was realized that concrete-mixtures design quality and characteristics, degree of exposures to corrosive-agents such as chloride salts, and protective-concrete cover-thickness are now known beyond doubt to be determinant factors as regards ...


Experimental And Numerical Investigation On The Irregularity Of Carbonation Depth Of Concrete Under Supercritical Condition, Hao Bao Masc, Min Yu Dr., Jianqiao Ye Dr., Lihua Xu Dr., Yin Chi Dr., J Ye 2019 Wuhan University

Experimental And Numerical Investigation On The Irregularity Of Carbonation Depth Of Concrete Under Supercritical Condition, Hao Bao Masc, Min Yu Dr., Jianqiao Ye Dr., Lihua Xu Dr., Yin Chi Dr., J Ye

International Conference on Durability of Concrete Structures

The heterogeneity of a cement-based material results in a random spatial distribution of carbonation depth, which may significantly affect the mechanical properties and durability of the material. Currently, there is a lack of both experimental and numerical investigations aiming at a statistical understanding of this important phenomenon. This paper presents both experimental and numerical supercritical carbonation test results of concrete blocks. The random fields of porosity and two-dimension random aggregate model of concrete were proposed for the simulation. The carbonation depths are measured and distributed along the carbonation boundary by the proposed rapid image processing technique, which are then statistically ...


Guiding Principles In Developing The South African Approach To Durability Index Testing Of Concrete, Yunus Ballim, Mark Alexander 2019 School of Civil & Environmental Engineering, University of the Witwatersrand, Johannesburg, South Africa

Guiding Principles In Developing The South African Approach To Durability Index Testing Of Concrete, Yunus Ballim, Mark Alexander

International Conference on Durability of Concrete Structures

Focused thinking on the possibility of early-age testing of concrete for long-term durability started in earnest during the late 1980’s in South Africa. Through sustained research, development and trial implementation on construction projects, three durability index (DI) tests have emerged, two of which have been adopted as national standard test methods for concrete construction, the remaining one being prepared a national standard. In this paper we review the guiding or foundational principles that directed the development of these DI tests, with a view to assessing the appropriateness and relevance of these guiding principles to modern concretes. The last 30 ...


The Effect Of Calcium Nitrate On The Hydration Of Calcium Aluminate Cement At Different Curing Temperatures, Hongxia Wang, Guizhi Diao, Guanghua Liu, H Wang, Lixiong Gao, Guangwei Liu 2019 China Building Materials Academy,State Key Laboratory of Green Building Materials

The Effect Of Calcium Nitrate On The Hydration Of Calcium Aluminate Cement At Different Curing Temperatures, Hongxia Wang, Guizhi Diao, Guanghua Liu, H Wang, Lixiong Gao, Guangwei Liu

International Conference on Durability of Concrete Structures

Phase conversion in calcium aluminate cements (CAC) induces significant volumetric instability; it would result in an increase in porosity and decrease in strength in CAC. In this study, calcium nitrate (CN) as a phase conversion inhibitor, the effect of CN on the hydration of CAC at different curing temperatures was studied. Xray diffraction, thermal analysis, SEM, isothermal calorimetry and the compressive strength were conducted on the CAC dosages of 0%, 5%, 10% and 15%CN cured at 20�, 30�, 40� and 50�. The results show CN can retard CAC hydration, alter the characters of the hydrates of CAC systems and ...


The Influence Of Waste Glass Powder On The Chloride Binding Capacity Of Fly Ash/Cement Hardened Paste, JH Yan, Tingyu Hao 2019 Purdue University

The Influence Of Waste Glass Powder On The Chloride Binding Capacity Of Fly Ash/Cement Hardened Paste, Jh Yan, Tingyu Hao

International Conference on Durability of Concrete Structures

The potential of using waste glass powder to increase the chloride binding capacity of fly ash/cement hardened paste was investigated. When only fly ash replacing cement, the chloride binding capacity was raised within 28d when the fly ash replacement level was in the range from 30-50% by mass. But at a longer age of 60 to 90d, the binding performance was increased at the replacement level of 10-30wt%. The chloride binding capacity of glass powder-fly ash-cement system was increased by adding glass powder of 2% and 4% by mass at 7d while those at larger addition and longer age ...


Alkali Reactive Carbonate Rocks: Is It Alkali Silica Reaction (Asr) Or Alkali Carbonate Reaction (Acr)?, Mengesha Beyene, RC Meininger 2019 SES Group & Associates, LLC

Alkali Reactive Carbonate Rocks: Is It Alkali Silica Reaction (Asr) Or Alkali Carbonate Reaction (Acr)?, Mengesha Beyene, Rc Meininger

International Conference on Durability of Concrete Structures

The root cause of distress in two different concrete structures made from carbonate coarse aggregates that fit the textural and compositional criteria cited for ACR was found to be caused by ASR, not ACR. Stereo-optical examination and transmitted polarized light microscopy (PLM) analysis showed that the concretes contain some dark gray, fine-grained argillaceous dolomitic coarse aggregates in which secondary white deposit filling the cracks extending from these aggregates into the paste (as well as lining air voids) is ASR gel. Back scattered electron (BSE) imaging with EDS spectra and x-ray elemental mappings, clearly confirm that the white secondary deposits consist ...


Grain Refinement In Iron-Based Materials, Simon Naumovich Lekakh, Von Richards, Ronald J. O'Malley, Jun Ge 2019 Missouri University of Science and Technology

Grain Refinement In Iron-Based Materials, Simon Naumovich Lekakh, Von Richards, Ronald J. O'Malley, Jun Ge

Materials Science and Engineering Faculty Research & Creative Works

A process for manufacturing an iron-based alloy comprising forming targeted fine oxide and/or carbide dispersoids in a melt, and sequentially precipitating transition-metal nitrides on the dispersoids for heterogeneous nucleation of equiaxed grains. An iron-based cast alloy having a highly equiaxed fine grain structure.


#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 ...


Reusable Nano-Structured Carbon Seawater Filter, Matheus Prates, Ian Durr 2019 Kennesaw State University

Reusable Nano-Structured Carbon Seawater Filter, Matheus Prates, Ian Durr

Georgia Undergraduate Research Conference (GURC)

Reusable Nanostructured Carbon Seawater Filter

Matheus Prates, Ian Durr, and Jungkyu Park

Kennesaw State University

In this study, we investigate seawater filtering capability of carbon nanostructures. Carbon based nanomaterials such as carbon nanotubes (CNT) and graphene are good candidates for the desalination of seawater. Since they are hydrophobic, only the organic contaminants in the water adhere to carbon nanomaterials while water molecules pass through efficiently. Moreover, water filters made of carbon nanomaterials are expected to be reusable because of their high melting point (higher than 3000 ºC). A simple heating method will evaporate all the contaminants in a carbon-based water ...


Machine Learning For Designing Stretchable Carbon Nanostructures, Helena Hepler, James Clarkston 2019 Kennesaw State University

Machine Learning For Designing Stretchable Carbon Nanostructures, Helena Hepler, James Clarkston

Georgia Undergraduate Research Conference (GURC)

In this research study, we employ machine learning algorithms to perform molecular dynamics simulations for graphene-like 3D carbon nanostructures. Custom MATLAB programs and Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS) are used to conduct the simulations in this report. The results obtained in this research will accelerate the development of more advanced nanomaterials such as 3D carbon nanostructures by improving the accuracy of the simulations of their material properties.


Atomistic Simulation Of Desalination, ian Durr, Matheus Prates 2019 Kennesaw State University

Atomistic Simulation Of Desalination, Ian Durr, Matheus Prates

Georgia Undergraduate Research Conference (GURC)

Atomistic Simulation of Desalination

Ian Durr, Matheus Prates, and Jungkyu Park

Kennesaw State University

In this research, we investigate the desalination capacity of three-dimensional (3D) carbon nanostructures using molecular dynamics simulations. 3D carbon nanostructures proposed here will filter seawater efficiently because of their multiple layers with holes of tunable sizes. The structure is designed to be flexible, allowing mechanical deformation during daily use. The 3D carbon nanostructure will still possess high thermal conductivity, enabling easy recycle through a simple heating process. Here, we employ LAMMPS, Large-scale Atomic/MolecularMassively Parallel Simulator distributed by Sandia National Laboratories to measure salt ion flux ...


Carbon Nanostructures Through The Use Of Three-Dimensional Laser-Lithography Printing, Alex Resnick, Justin Park Dr., Biya Haile, Eduardo Farfan Dr. 2019 Kennesaw State University

Carbon Nanostructures Through The Use Of Three-Dimensional Laser-Lithography Printing, Alex Resnick, Justin Park Dr., Biya Haile, Eduardo Farfan Dr.

Georgia Undergraduate Research Conference (GURC)

Three-dimensional carbon nanostructures are a critical component in future electronic and material products across many consumer and industrial applications. Much of the carbon nanostructure is comprised of graphene, a carbon species known for having considerably strong mechanical strength and remarkably high electrical and thermal conductivity. The primarily-graphene, three-dimensional structures are necessary for next-generation processing chips, wearable technology, and liquid filtration; all of which have a need for thermal or electrical conductivities many factors higher than current technology can achieve. Development of multi-layered graphene structures are an important goal of nano-material research in the next decade. Current graphene structures are restricted ...


Extrusion Of Perovskite Oxide/ Silica Composites For Thermochemical Carbon Dioxide Conversion, Qian Li 2019 University of South Florida

Extrusion Of Perovskite Oxide/ Silica Composites For Thermochemical Carbon Dioxide Conversion, Qian Li

Graduate Theses and Dissertations

In order to solve the increasing greenhouse effect problem, perovskite-type oxides have been used to convert CO2 to CO in a reverse water-gas shift chemical looping (RWGS-CL) process. Currently, the process is at the micro-reactor scale and used catalyst in powder form. However, formed materials are needed if the scale is to be increased.

Our research focus is on increasing the conversion yield of perovskite oxides with SiO2 support and scaling up the powder form perovskite-type oxides to pellet by extrusion. The binder added during the extrusion process must be removed to avoid affecting the performance of the catalyst and ...


Sorption Of Benzene, Toluene, Ethylbenzene And Different Ratios Of Mixture Solvent By Plasticized Pema Films Using A Qcm Sensor, Xinpeng Li 2019 University of South Florida

Sorption Of Benzene, Toluene, Ethylbenzene And Different Ratios Of Mixture Solvent By Plasticized Pema Films Using A Qcm Sensor, Xinpeng Li

Graduate Theses and Dissertations

VOCs (volatile organic compounds) can cause great harm to human health especially benzene, toluene and ethylbenzene. In this work a Quartz Crystal Microbalance (QCM) sensor with a polymer/plasticizer film was developed to quantify the VOCs both in air and water. QCM is an acoustic wave sensor that can be used well in detecting the aromatic compounds in the film. Because more than one VOC is present in the air, this thesis focuses on finding the sorption of different ratios of VOCs (benzene, toluene, ethylbenzene) using a polymer/plasticizer film in QCM. Poly (ethyl methacrylate) (PEMA) was used as the ...


From Critical Behavior To Catastrophic Runaways: Comparing Sheared Granular Materials With Bulk Metallic Glasses, Alan A. Long, Dmitry Denisov, Peter Schall, Todd C. Hufnagel, Xiaojun Gu, Wendelin J. Wright, Karin A. Dahmen 2019 University of Illinois at Urbana-Champaign

From Critical Behavior To Catastrophic Runaways: Comparing Sheared Granular Materials With Bulk Metallic Glasses, Alan A. Long, Dmitry Denisov, Peter Schall, Todd C. Hufnagel, Xiaojun Gu, Wendelin J. Wright, Karin A. Dahmen

Faculty Journal Articles

The flow of granular materials and metallic glasses is governed by strongly correlated, avalanche-like deformation. Recent comparisons focused on the scaling regimes of the small avalanches, where strong similarities were found in the two systems. Here, we investigate the regime of large avalanches by computing the temporal profile or “shape” of each one, i.e., the time derivative of the stress-time series during each avalanche. We then compare the experimental statistics and dynamics of these shapes in granular media and bulk metallic glasses. We complement the experiments with a mean-field model that predicts a critical size beyond which avalanches turn ...


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