Open Access. Powered by Scholars. Published by Universities.®

Materials Chemistry Commons

Open Access. Powered by Scholars. Published by Universities.®

1,296 Full-Text Articles 2,447 Authors 307,239 Downloads 97 Institutions

All Articles in Materials Chemistry

Faceted Search

1,296 full-text articles. Page 6 of 48.

Recycled Sm-Co Bonded Magnet Filaments For 3d Printing Of Magnets, Helena A. Khazdozian, J. Sebastian Manzano, Kinjal Gandha, Igor I. Slowing, Ikenna C. Nlebedim 2018 Ames Laboratory

Recycled Sm-Co Bonded Magnet Filaments For 3d Printing Of Magnets, Helena A. Khazdozian, J. Sebastian Manzano, Kinjal Gandha, Igor I. Slowing, Ikenna C. Nlebedim

Ames Laboratory Accepted Manuscripts

Recycling of rare earth elements, such as Sm and Nd, is one technique towards mitigating long-term supply and cost concerns for materials and devices that depend on these elements. In this work recycled Sm-Co powder recovered from industrial grinding swarfs, or waste material from magnet processing, was investigated for use in preparation of filament for 3D printing of bonded magnets. Recycled Sm-Co powder recovered from swarfs was blended into polylactic acid (PLA). Up to 20 vol.% of the recycled Sm-Co in PLA was extruded at 160°C to produce a filament. It was demonstrated that no degradation of magnetic properties ...


Zwitterionic Trivalent (Alkyl)Lanthanide Complexes In Ziegler-Type Butadiene Polymerization, Bradley M. Schmidt, Aradhana Pindwal, Amrit Venkatesh, Arkady Ellern, Aaron Rossini, Aaron D. Sadow 2018 Iowa State University

Zwitterionic Trivalent (Alkyl)Lanthanide Complexes In Ziegler-Type Butadiene Polymerization, Bradley M. Schmidt, Aradhana Pindwal, Amrit Venkatesh, Arkady Ellern, Aaron Rossini, Aaron D. Sadow

Chemistry Publications

The organolanthanide complexes Ln{C(SiHMe2)3}3 (Ln = La, 1a; Ce, 1b; Pr, 1c; Nd, 1d) react with one or two equiv. of B(C6F5)3 to yield the well-defined zwitterionic species Ln{C(SiHMe2)3}2HB(C6F5)3 (Ln = La, 2a; Ce, 2b; Pr, 2c; Nd, 2d) or LnC(SiHMe2)3{HB(C6F5)3}2 (Ln = La, 3a; Ce, 3b; Pr, 3c; Nd, 3d), respectively. These complexes are shown to contain labile, bridging Si–H⇀Ln and o-F->Ln interactions based upon the observation ...


Chemoselective Hydrogenation With Supported Organoplatinum(Iv) Catalyst On Zn(Ii)-Modified Silica, Jeffrey Camacho-Bunquin, Magali Ferrandon, Hyuntae Sohn, Dali Yang, Cong Liu, Patricia Anne Ignacio-de Leon, Frederic A. Perras, Marek Pruski, Peter C. Stair, Massimiliano Delferro 2018 Argonne National Laboratory

Chemoselective Hydrogenation With Supported Organoplatinum(Iv) Catalyst On Zn(Ii)-Modified Silica, Jeffrey Camacho-Bunquin, Magali Ferrandon, Hyuntae Sohn, Dali Yang, Cong Liu, Patricia Anne Ignacio-De Leon, Frederic A. Perras, Marek Pruski, Peter C. Stair, Massimiliano Delferro

Ames Laboratory Accepted Manuscripts

Well-defined organoplatinum(IV) sites were grafted on a Zn(II)-modified SiO2 support via surface organometallic chemistry in toluene at room temperature. Solid-state spectroscopies including XAS, DRIFTS, DRUV–vis, and solid-state (SS) NMR enhanced by dynamic nuclear polarization (DNP), as well as TPR-H2 and TEM techniques revealed highly dispersed (methylcyclopentadienyl)methylplatinum(IV) sites on the surface ((MeCp)PtMe/Zn/SiO2, 1). In addition, computational modeling suggests that the surface reaction of (MeCp)PtMe3 with Zn(II)-modified SiO2 support is thermodynamically favorable (ΔG = −12.4 kcal/mol), likely due to the increased acidity of the hydroxyl group, as indicated ...


Quantitative Atomic-Scale Structure Characterization Of Ordered Mesoporous Carbon Materials By Solid State Nmr, Zhuoran Wang, Naftali Opembe, Takeshi Kobayashi, Nicholas C. Nelson, Igor I. Slowing, Marek Pruski 2018 Iowa State University and Ames Laboratory

Quantitative Atomic-Scale Structure Characterization Of Ordered Mesoporous Carbon Materials By Solid State Nmr, Zhuoran Wang, Naftali Opembe, Takeshi Kobayashi, Nicholas C. Nelson, Igor I. Slowing, Marek Pruski

Chemistry Publications

Solid-state (SS)NMR techniques were applied to characterize the atomic-scale structures of ordered mesoporous carbon (OMC) materials prepared using Pluronic F127 as template with resorcinol and formaldehyde as polymerizing precursors. A rigorous quantitative analysis was developed using a combination of 13C SSNMR spectra acquired with direct polarization and cross polarization on natural abundant and selectively 13C-enriched series of samples pyrolyzed at various temperatures. These experiments identified and counted the key functional groups present in the OMCs at various stages of preparation and thermal treatment. The chemical evolution of molecular networks, the average sizes of aromatic clusters and the ...


Surface Functionalization Of Fabrics And Threads For Smart Textiles, Morgan Baima 2018 University of Massachusetts Amherst

Surface Functionalization Of Fabrics And Threads For Smart Textiles, Morgan Baima

Doctoral Dissertations

The future of electronics is moving toward wearable devices and therefore requires a shift away from hard, inflexible materials towards fibers, threads, and fabrics that conform to the shape of the body. Therefore new methods for incorporating textiles as electronic components are needed to replace conventional processing techniques used with smooth, flat substrates like glass, silicon, and many polymers. Toward this end, this work investigates different methods that can be used to tune textile surfaces for electronic functionality, including weaving, solution grafting, and initiated chemical vapor deposition (iCVD). While all of these methods were used to make triboelectrically-active textiles, iCVD ...


Light-Harvesting And Light-Responsive Materials For Optoelectronic And Biological Applications, youngju bae 2018 University of Massachusetts Amherst

Light-Harvesting And Light-Responsive Materials For Optoelectronic And Biological Applications, Youngju Bae

Doctoral Dissertations

In photodynamic therapy, several critical standards are required of photosensitizers including high singlet oxygen quantum yield, biocompatibility in dark, and long term photochemical stability. In addition, current PDT systems lack active targeting strategies to tumor cells, and instead mainly rely on the natural distribution of PS in the body following injection and application of near-infrared light treatment in the tumor region. This thesis describes a series of BODIPY-based molecules that were designed, synthesized and studied as photosensitizers with high singlet oxygen generation capacity through utilizing the heavy atom effect. Additionally, aqueous solubility and active targeting capability were introduced by photosensitizer ...


The Dissociative Chemisorption Of Methane And Its Isotopologues On Metal Surfaces, Han Guo 2018 University of Massachusetts Amherst

The Dissociative Chemisorption Of Methane And Its Isotopologues On Metal Surfaces, Han Guo

Doctoral Dissertations

The dissociative chemisorption of small molecules on metal surfaces is an important step in many heterogeneous catalytic processes, and has received considerable scientific attention. In this thesis, a quantum approach based on the reaction path Hamiltonian is used to explore the dissociative chemisorption of methane and its deuterated isotopologues on several metal surfaces.

The theoretical approach is described in Chapter 2. This approach treats all 15 degrees of freedom of the methane molecule, and includes the effects of lattice motion, allowing us to examine the translational and vibrational enhancements, mode- and bond-selectivity and the surface temperature dependence observed in experiments ...


Design And Synthesis Of Stimuli-Responsive Polymeric Nanogels Towards Therapeutic Translation, Mallory R. Gordon 2018 University of Massachusetts Amherst

Design And Synthesis Of Stimuli-Responsive Polymeric Nanogels Towards Therapeutic Translation, Mallory R. Gordon

Doctoral Dissertations

In the application of delivery of therapeutics, nanostructures of various composition have been employed due to their capacity to act as a host for lipophilic payloads. Advances in the synthetic preparation, size, morphology, and chemical or physical characteristics of polymers have impacted their development and versatility. A detailed understanding of polymeric nanoparticle host-guest properties is crucial to their practical translation to specific delivery applications. Further, these features must be highly tailorable to overcome biological barriers, stably encapsulate their therapeutic contexts, and exhibit payload release selectively in the target environment. In this dissertation, we aim to rationally design polymeric nano-scale assemblies ...


Modification Of Wheat Gluten For Improvement Of Binding Capacity With Keratin In Hair, Shukun Wang, Danyang Meng, Sisi Wang, Zhong Zhang, Ruijin Yang, Wei Zhao 2018 Jiangnan University

Modification Of Wheat Gluten For Improvement Of Binding Capacity With Keratin In Hair, Shukun Wang, Danyang Meng, Sisi Wang, Zhong Zhang, Ruijin Yang, Wei Zhao

Faculty Publications in Food Science and Technology

In this study, enzymatic hydrolysis and cationization with epoxypropyldodecyldimethylammonium chloride of wheat protein, an economic protein complex containing great amount of disulfide bonds, were conducted to improve properties such as solubility and disassociation behaviour for recovery of damaged hair when used in shampoo. The optimal conditions for enzymatic hydrolysis were pH 8.2, 55°C with Alcalase for 60min. After the selected hydrolysis, the degree of hydrolysis, nitrogen solubility index, foaming capacity index, foam stability index, emulsifying activity index and emulsion stability index of hydrolysate with 58.71% of shortchain peptides (less than 1000 Da) were 8.81%, 39.07 ...


Abnormal Phase Transition Between Two-Dimensional High-Density Liquid Crystal And Low-Density Crystalline Solid Phases, Wenbin Li, Longjuan Kong, Baojie Feng, Huixia Fu, Hui Li, Xiao Cheng Zeng, Kehui Wu, Lan Chen 2018 University of Chinese Academy of Sciences

Abnormal Phase Transition Between Two-Dimensional High-Density Liquid Crystal And Low-Density Crystalline Solid Phases, Wenbin Li, Longjuan Kong, Baojie Feng, Huixia Fu, Hui Li, Xiao Cheng Zeng, Kehui Wu, Lan Chen

Xiao Cheng Zeng Publications

Some two-dimensional liquid systems are theoretically predicted to have an anomalous phase transition due to unique intermolecular interactions, for example the first-order transition between two-dimensional high-density water and low-density amorphous ice. However, it has never been experimentally observed, to the best of our knowledge. Here we report an entropy-driven phase transition between a high-density liquid crystal and low-density crystalline solid, directly observed by scanning tunneling microscope in carbon monoxide adsorbed on Cu(111). Combined with first principle calculations, we find that repulsive dipole–dipole interactions between carbon monoxide molecules lead to unconventional thermodynamics. This finding of unconventional thermodynamics in two-dimensional ...


Direct 17o Dynamic Nuclear Polarization Of Single-Site Heterogeneous Catalysts, Frederic A. Perras, Kasuni Chathurika Boteju, Igor Ivan Slowing, Aaron D. Sadow, Marek Pruski 2018 Ames Laboratory

Direct 17o Dynamic Nuclear Polarization Of Single-Site Heterogeneous Catalysts, Frederic A. Perras, Kasuni Chathurika Boteju, Igor Ivan Slowing, Aaron D. Sadow, Marek Pruski

Chemistry Publications

We utilize direct 17O DNP for the characterization of non-protonated oxygens in heterogeneous catalysts. The optimal sample preparation and population transfer approach for 17O direct DNP experiments performed on silica surfaces are determined and applied to the characterization of Zr- and Y-based mesoporous silica-supported single-site catalysts.


Effects Of -No2 And -Nh2 Functional Groups In Mixed-Linker Zr-Based Mofs On Gas Adsorption Of Co2 And Ch4, Zana Hassan Rada, Hongqi Sun, Jin Shang, Jiaye Li, Yingdian He, Shaomin Liu, Shaobin Wang 2018 Edith Cowan University

Effects Of -No2 And -Nh2 Functional Groups In Mixed-Linker Zr-Based Mofs On Gas Adsorption Of Co2 And Ch4, Zana Hassan Rada, Hongqi Sun, Jin Shang, Jiaye Li, Yingdian He, Shaomin Liu, Shaobin Wang

ECU Publications Post 2013

This study was undertaken to evaluate the effects of mixing BDC-NO2 and BDC-NH2 linkers in the synthesis of Zr-based metal organic frameworks (Zr-MOFs) on their adsorption and separation of CO2 and CH4. UiO-66 with single or binary -NO2 and -NH2 samples were synthesized under solvothermal conditions and activated by solvent exchanging using methanol. Structural analyses of the materials were conducted using FTIR, XRD, TGA, SEM, 1HNMR and N2 adsorption/desorption techniques and adsorption of CO2 and CH4 at high pressures and different temperatures (273 and 298 K) was investigated. It ...


Bismuth Ferrite-Based Lead-Free Ceramics And Multilayers With High Recoverable Energy Density, Dawei Wang, Zhongming Fan, Di Zhou, Amir Khesro, Shunsuke Murakami, Antonio Feteira, Quanliang Zhao, Xiaoli Tan, Ian M. Reaney 2018 University of Sheffield

Bismuth Ferrite-Based Lead-Free Ceramics And Multilayers With High Recoverable Energy Density, Dawei Wang, Zhongming Fan, Di Zhou, Amir Khesro, Shunsuke Murakami, Antonio Feteira, Quanliang Zhao, Xiaoli Tan, Ian M. Reaney

Materials Science and Engineering Publications

Lead-free ceramics with high recoverable energy density (Wrec) and energy storage efficiency (η) are attractive for advanced pulsed power capacitors to enable greater miniaturization and integration. In this work, dense bismuth ferrite (BF)-based, lead-free 0.75(Bi1−xNdx)FeO3-0.25BaTiO3 (BNxF-BT) ceramics and multilayers were fabricated. A transition from a mixed pseudocubic and R3c to a purely pseudocubic structure was observed as x increased with the optimum properties obtained for mixed compositions. The highest energy densities, W ∼ 4.1 J cm−3 and Wrec ∼ 1.82 J cm−3, were achieved for BN15F-BT, due to the enhanced breakdown field ...


Hyperpolarized Porous Silicon Nanoparticles: Potential Theragnostic Material For 29si Magnetic Resonance Imaging, Hyeonglim Seo, Ikjang Choi, Nicholas Whiting, Jingzhe Hu, Quy S. Luu, Shivanand Pudakalakatti, Caitlin McCowan, Yaewon Kim, Niki Zacharias Millward, Seunghyun Lee, Pratip Bhattacharya, Youngbok Lee 2017 Hanyang University

Hyperpolarized Porous Silicon Nanoparticles: Potential Theragnostic Material For 29si Magnetic Resonance Imaging, Hyeonglim Seo, Ikjang Choi, Nicholas Whiting, Jingzhe Hu, Quy S. Luu, Shivanand Pudakalakatti, Caitlin Mccowan, Yaewon Kim, Niki Zacharias Millward, Seunghyun Lee, Pratip Bhattacharya, Youngbok Lee

Nicholas Whiting

Porous silicon nanoparticles have recently garnered attention as potentially-promising biomedical platforms for drug delivery and medical diagnostics. Here, we demonstrate porous silicon nanoparticles as contrast agents for 29Si magnetic resonance imaging. Size-controlled porous silicon nanoparticles were synthesized by magnesiothermic reduction of silica nanoparticles and were surface activated for further functionalization. Particles were hyperpolarized via dynamic nuclear polarization to enhance their 29Si MR signals; the particles demonstrated long 29Si spin-lattice relaxation (T1) times (~25 mins), which suggests potential applicability for medical imaging. Furthermore, 29Si hyperpolarization levels were sufficient to allow 29Si MRI in phantoms. These results underscore the potential of porous ...


Fabrication And Characterization Of Intricate Nanostructures, Treva T. Brown 2017 University of New Orleans

Fabrication And Characterization Of Intricate Nanostructures, Treva T. Brown

University of New Orleans Theses and Dissertations

Encapsulation of nanoparticles within hexaniobate nanoscrolls presents interesting advances in the formation of nanocomposites exhibiting unique multi-dimensional properties. Building upon previous successes, facile yet versatile wet-chemical and microwave-irradiation synthetic protocols for the fabrication of a series of hexaniobate composites are presented herein. Solvothermal and, more recently, microwave-assisted methods have been developed that allow for the fabrication of peapod-like structures. During solvothermal treatment, exfoliated hexaniobate nanosheets scroll around highly ordered chains of preformed nanoparticles (NPs) to produce nanopeapods (NPPs). This approach offers versatility and high yields, in addition to the potential for advanced functional device fabrication.

For the characterization of these ...


Three-Dimensional Nanomaterials For Supercapacitor Applications: From Metal Oxides To Metal Phosphides, Zhi Zheng 2017 University of New Orleans

Three-Dimensional Nanomaterials For Supercapacitor Applications: From Metal Oxides To Metal Phosphides, Zhi Zheng

University of New Orleans Theses and Dissertations

Over the past few years, energy storage devices have received tremendous interest due to the increasing demand for sustainable and renewable energy in modern society. Supercapacitors are considered as one of the most promising energy storage devices because of their high power density and long cycle life. However, low energy density remains as the main shortcoming for supercapacitors. The overall performance of supercapacitors is predominantly determined by the characteristics of the electrodes. Specifically, constructing nanostructured electrode material has been proven as an efficient way to improve the performance by providing large surface area and short ionic and electronic diffusion paths ...


Adsorbed Gas Behaviour And Guest-Host Interactions In Ultramicroporous Metal-Organic Frameworks, Bligh Desveaux 2017 The University of Western Ontario

Adsorbed Gas Behaviour And Guest-Host Interactions In Ultramicroporous Metal-Organic Frameworks, Bligh Desveaux

Electronic Thesis and Dissertation Repository

Metal-organic frameworks (MOFs) are a class of porous materials that have attracted much attention due to their large surface areas, high tunability and their high selectivity for gas adsorption applications. In this work, solid-state nuclear magnetic resonance (SSNMR) experiments and single crystal X-ray diffraction (SCXRD) experiments are used to investigate carbon dioxide adsorption within the ultramicroporous MOFs SIFSIX-3-Zn (Chapter 2) and ZnAtzOx. (Chapter 3). Analysis finds that the CO2 SIFSIX-3-Zn undergoes wobbling motions with a low temperature dependence, and in ZnAtzOx undergoes wobbling and hopping motions with a low temperature dependence. SCXRD is used to precisely determine the CO ...


Studying Metal-Organic Frameworks Via Solid-State Nmr: Gas Dynamics, Structure Determination, And Phase Transition, Yue Zhang 2017 The University of Western Ontario

Studying Metal-Organic Frameworks Via Solid-State Nmr: Gas Dynamics, Structure Determination, And Phase Transition, Yue Zhang

Electronic Thesis and Dissertation Repository

Metal-organic frameworks (MOFs) are a class of microporous materials constructed from virtually endless combinations of metal centres and organic linkers. MOFs have attracted intense research interest in recent decades, since MOFs have outstanding properties such as extremely high surface area, tuneable pore topology, good stability, and many others. MOFs are also promising candidates for gas storage. In this work, solid-state NMR (SSNMR) spectroscopy has been investigated to study MOFs and their guest molecules, since SSNMR can provide information on the short-range environment about target nuclei and can also reveal the dynamics of guest molecules.

An introduction to MOFs and SSNMR ...


Synthesis And Characterization Of Thermoresponsive Hydrogels Based On N-Isopropylacrylamide Crosslinked With 4,4′-Dihydroxybiphenyl Diacrylate, Shuo Tang, Martha Floy, Rohit Bhandari, Manjula Sunkara, Andrew J. Morris, Thomas D. Dziubla, J. Zach Hilt 2017 University of Kentucky

Synthesis And Characterization Of Thermoresponsive Hydrogels Based On N-Isopropylacrylamide Crosslinked With 4,4′-Dihydroxybiphenyl Diacrylate, Shuo Tang, Martha Floy, Rohit Bhandari, Manjula Sunkara, Andrew J. Morris, Thomas D. Dziubla, J. Zach Hilt

Chemical and Materials Engineering Faculty Publications

A novel crosslinker [4,4′-dihydroxybiphenyl diacrylate (44BDA)] was developed, and a series of temperature-responsive hydrogels were synthesized through free radical polymerization of N-isopropylacrylamide (NIPAAm) with 44BDA. The temperature-responsive behavior of the resulting gels was characterized by swelling studies, and the lower critical solution temperature (LCST) of the hydrogels was characterized through differential scanning calorimetry. Increased content of 44BDA led to a decreased swelling ratio and shifted the LCST to lower temperatures. These novel hydrogels also displayed resiliency through multiple swelling–deswelling cycles, and their temperature responsiveness was reversible. The successful synthesis of NIPAAm-based hydrogels crosslinked with 44BDA has ...


On The Edge Of Periodicity: Unconventional Magnetism Of Gd117co56.4sn114.3, J. Liu, Yaroslav Mudryk, D. H. Ryan, Vitalij K. Pecharsky 2017 Iowa State University and Ames Laboratory

On The Edge Of Periodicity: Unconventional Magnetism Of Gd117co56.4sn114.3, J. Liu, Yaroslav Mudryk, D. H. Ryan, Vitalij K. Pecharsky

Ames Laboratory Accepted Manuscripts

Magnetization measurements reveal the onset of magnetic ordering at TC = 65 K followed by three additional magnetic anomalies at T1 = 47 K, T2 = 28 K, and T3 = 11 K in Gd117Co56.4Sn114.3 – a compound with a giant cubic unit cell that crystallizes in the Dy117Co56Sn112 structure type with space group Fm3¯m and lattice parameter a = 30.186 Å. The magnetic ordering temperature increases with applied magnetic field; however, the analysis of magnetic data indicates that antiferromagnetic interactions also play a role in the ground state. AC magnetic susceptibility confirms multiple magnetic anomalies and shows minor frequency dependence. The ...


Digital Commons powered by bepress