Article
Materials Science, Ceramics
Jie Fu
Summary: PNb9O25 ceramic was prepared using the sparking plasma sintering (SPS) method. The ceramic exhibited high dielectric constant, low dielectric loss, and high electrical conductivity, showing stable performance within a certain temperature range.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Polymer Science
Weikai Sun, Minhao Yang, Kun Peng, Yaqin Fu
Summary: The demand for high-speed communication at high frequency has led to the development of low-dielectric polymer films. Aromatic polyimide (PI) is commonly used in flexible circuit boards due to its excellent properties, but its dielectric constant is relatively high for high-frequency communication. To address this, a hyper-crosslinked polymer (HCP) was synthesized and blended with PI to form all-organic HCP/PI composite films. The porous structure of HCP helps to reduce the dielectric constant of the PI matrix. By adjusting the HCP content, the dielectric constant of the composite films can be effectively lowered in the desired frequency range. This method is simple and can be applied to other organic component-filled PI systems.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Materials Science, Ceramics
Tomoki Murata, Toru Asaka, Sakyo Hirose
Summary: Dielectric tunability has been extensively studied in ferroelectric materials, with negative tunability being common and positive tunability rare. However, titanite CaTiSiO5 demonstrates both positive and negative tunability, suggesting unique behavior in high electric fields compared to conventional antiferroelectrics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Review
Polymer Science
Zhenjiang Pang, Hengchao Sun, Yan Guo, Jun Du, Liang Li, Qiuyang Li, Junzhong Yang, Jijun Zhang, Weiguo Wu, Sen Yang
Summary: With the growth of the microelectronics industry, the need for interlayer insulation materials with low dielectric constant (k) has gained significant attention. This study reviews the development of porous PI-based composites aimed at reducing the dielectric constant. It emphasizes the application of porous SiO2, graphene derivatives, polyoxometalates, polyhedral oligomeric silsesquioxane, and hyperbranched polysiloxane in achieving low k PI.
Article
Chemistry, Multidisciplinary
Michal Liberka, Mikolaj Zychowicz, James Hooper, Koji Nakabayashi, Shin-ichi Ohkoshi, Szymon Chorazy
Summary: Switching of multiple physical properties in dynamic materials enables applications in various fields. In this study, inorganic-organic molecular hybrids were tested as molecular switches of electrical characteristics and showed potential for switching light emission as well. The materials underwent a phase transition that resulted in a synchronous switching of the dielectric constant and photoluminescence.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Multidisciplinary
Pierre-Olivier Robitaille, Hakima Abou-Rachid, Josee Brisson
Summary: The study focuses on predicting the dielectric constants of energetic materials using density functional theory and ab-initio approaches, with CAM-B3LYP and AUG-ccpVDZm identified as the most effective functional/basis set combinations. The accuracy of the calculations is found to be below 5% deviation when compared to experimental data.
DEFENCE TECHNOLOGY
(2021)
Article
Polymer Science
Zheng Tang, Chaofan Chang, Feng Bao, Lei Tian, Huichao Liu, Mingliang Wang, Caizhen Zhu, Jian Xu
Summary: This study validated the feasibility of predicting the static dielectric constants of polymer materials using DFT method combined with B3LYP functional, and simulated the dielectric constants of three typical polymer materials with excellent agreement to experimental data, demonstrating great potential for future applications.
Article
Chemistry, Multidisciplinary
Dai-Lin Zhou, Jiang-Hui Li, Qing-Yun Guo, Xiong Lin, Qin Zhang, Feng Chen, Di Han, Qiang Fu
Summary: This study explores the impact of POSS cage size on the dielectric and other properties of hybrid materials for the first time, finding that cage size strongly affects dielectric constants and may lead to the prediction of materials with lower dielectric constants.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Olga Arroyo-Gascon, Yuriko Baba, Jorge Cerda, Oscar de Abril, Ruth Martinez, Francisco Dominguez-Adame, Leonor Chico
Summary: In this study, we investigate the effects of a non-magnetic impurity located at the surface of the SnTe topological crystalline insulator. We find that doping leads to a shift of the Dirac cones in energy, which strongly depends on the impurity position with respect to the surface. By comparing different geometries, we demonstrate that the surface states remain gapless in the doped semi-infinite system, while a gap opens in the slab geometry.
Article
Materials Science, Ceramics
S. J. Burns
Summary: The thermodynamics of linear dielectric are formally developed to explore the isothermal and adiabatic temperature-pressure dependence of dielectric constants. The argument for the dielectric constant's isentropic temperature dependence is thermodynamic and applicable to all physical models. The isentropic slope of the displacement field vs the electric field shows instability at high temperatures due to changes in the curvature of the temperature dependence of the dielectric constant, impacting the electronic entropy contribution.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Crystallography
Jiuyuan Han, Mengjiao Chi, Liu Yang, Bing Liu, Minmin Mao, Hadi Barzegar Bafrooei, Zhongyan Ma, Yingjie Ren, Feng Shi, Ehsan Taheri-Nassaj, Dawei Wang, Kaixin Song
Summary: Dense composites of NaCl-NZO and HB-NZO-NaCl were prepared using the cold sintering process. The resulting ceramic composites showed promising characteristics with comparable permeability and dielectric constants suitable for radio-frequency electronic device applications. These findings indicate potential applications in wireless communication.
Article
Chemistry, Multidisciplinary
Ruofei Hu, Xiaoxuan Yang, Wenxiu Cui, Linfei Leng, Xueyan Zhao, Guochen Ji, Jing Zhao, Qingzeng Zhu, Junping Zheng
Summary: A starch-based ADM gel with high stretchability, self-healing performance, and moisturizing properties has been prepared through a cooking strategy. This gel can be used for the preparation of high-performance recycled gels and flexible sensors.
ADVANCED MATERIALS
(2023)
Article
Physics, Condensed Matter
Arham S. Ahmed, Jhalak Gupta, Abdul Hakeem Anwer, Mohammad Zain Khan
Summary: In this study, a facile sol-gel ultrasonication route was used to synthesize a series of Co3O4/NiO nanocomposites. The synthesized specimens were characterized using various experimental techniques. It was found that these nanocomposite samples exhibited good dielectric properties for high frequency applications, and also showed improved electrochemical properties compared to their component materials.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Polymer Science
Jiale Qiao, Haiwei Mu, Chao Liu, Zhaoting Liu
Summary: Composite films prepared by blending high-entropy spinel ferrite nanofibers with PVDF exhibited good performance under the influence of a magnetic field. The 3 vol% 7FO/PVDF film treated in a 0.8 T magnetic field for 3 min showed a maximum discharge energy density of 6.23 J/cm(3), efficiency of 58%, and beta-phase content of 51%. Additionally, the dielectric constant and dielectric loss were 13.3 and 0.035, respectively, at a frequency of 1 kHz.
Review
Materials Science, Multidisciplinary
Jiaren Hou, Linxuan Fang, Gang Huang, Menglu Dai, Fengping Liu, Caiyun Wang, Minghui Li, Heng Zhang, Jing Sun, Qiang Fang
Summary: Biomass-derived low dielectric polymers are attracting attention due to their availability and renewability, showing potential for applications in the microelectronic industry, especially in 5G communication. This review summarizes recent progress in the synthesis and properties of various biomass-derived resins with good dielectric properties and high thermostability.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Chao Lang, Elisabeth C. Lloyd, Kelly E. Matuszewski, Yifan Xu, Venkat Ganesan, Rui Huang, Manish Kumar, Robert J. Hickey
Summary: This study reports on the fabrication of nanostructured fibres using solution-phase block copolymer self-assembly and strain-programmed crystallization, which exhibit excellent mechanical properties, multi-trigger actuation, and high-performance rotation. The fibres possess highly aligned nanoscale structures with alternating crystalline and amorphous domains, resembling the pattern of mammalian skeletal muscle. Compared to current actuators, these nanostructured block copolymer muscles show superior efficiency, actuation strain, and mechanical properties, and can perform on/off rotary actuation and multi-trigger actuation.
NATURE NANOTECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
James F. F. Ponder Jr, Shawn A. A. Gregory, Amalie Atassi, Abigail A. A. Advincula, Joshua M. M. Rinehart, Guillaume Freychet, Gregory M. M. Su, Shannon K. K. Yee, John R. R. Reynolds
Summary: A method to produce highly electrically conductive PEDOT(OH) films is reported. This method utilizes a solution processable precursor polymer PEDOT(EHE) and basic hydrolysis to remove the electrically insulative side chains.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Yifan Xu, Robert J. Hickey
Summary: Blending small molecule chromophore with block copolymer drives the formation of a bicontinuous cubic microstructure and enables selective partitioning and co-crystallization. The network templates the crystallization process and affects the chiral component of the sample.
Article
Thermodynamics
Xiaoshi Zhang, Jason D. Alexander, Jiho Seo, Anne M. Gohn, Matthew J. Behary, Richard P. Schaake, Ralph H. Colby, Alicyn M. Rhoades
Summary: The interior structure of PEEK composite pellets was reconstructed using ultra-high-resolution X-ray computed tomography (XCT), and different slicing methods were analyzed. For samples with thickness less than 50μm, PEEK samples sliced perpendicular to the fiber flow direction showed good filler homogeneity and lower coefficient of variation compared to samples sliced along the fiber flow direction. This conclusion was supported by further studies on the crystallization kinetics of PEEK and its composites.
THERMOCHIMICA ACTA
(2023)
Article
Chemistry, Physical
Deyang Yu, Diego Troya, Andrew G. Korovich, Joshua E. Bostwick, Ralph H. Colby, Louis A. Madsen
Summary: Lithium batteries rely on fast charge and mass transport of Li+ in the electrolyte. Quantification of Li+ transport in glycerol-salt electrolytes via NMR experiments and MD simulations reveals a surprising Li+-hopping mechanism. This system represents a bridge between liquid and inorganic solid electrolytes, motivating new molecular designs for fast-charging and all-solid-state batteries.
ACS ENERGY LETTERS
(2023)
Review
Nanoscience & Nanotechnology
Vincent M. Torres, Erik Furton, Jensen N. Sevening, Elisabeth C. Lloyd, Masafumi Fukuto, Ruipeng Li, Darren C. Pagan, Allison M. Beese, Bryan D. Vogt, Robert J. Hickey
Summary: The tunable properties of thermoplastic elastomers (TPEs) allow them to be used in a wide range of applications. The design and synthesis of new macromolecules are necessary to control the mechanical properties of TPEs. In this study, in situ small-angle X-ray scattering (SAXS) measurements reveal distinct deformation mechanisms between linear and grafted TPEs, leading to enhanced mechanical properties.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Polymer Science
Wenwen Mei, Deyang Yu, Louis A. Madsen, Robert J. Hickey, Ralph H. Colby
Summary: Understanding the dielectric response and charge transport in ion-containing polymers is crucial for their application in energy-related fields. In this study, the impact of anion chemical composition on ion conduction in poly(ethylene oxide)-based lithium ionomers was investigated using a four-state model. DFT calculations with the cluster-continuum solvation model revealed low cluster dissociation energy and explained the weakly aggregated morphology, indicating rapid exchange of Li+ between different ion states. These findings offer new insights for promoting ion conduction and dielectric response in single-ion conducting ionomers.
Article
Chemistry, Multidisciplinary
Elena Ewaldz, Joshua M. Rinehart, Madison Miller, Blair Brettmann
Summary: Polymer-based thermoelectric generators are attractive for wearable electronics as they can utilize body heat for power generation. Conducting polymer fibers with high porosity and good flexibility have advantages over thin films for wearable electronics. Although electrospinning of conducting polymers faces challenges, this study addresses these challenges and successfully fabricates ultrafine fibers for thermoelectric generators.
Article
Chemistry, Multidisciplinary
Robert J. Hickey
Summary: Living systems exhibit diverse materials properties due to their multiscale hierarchical structures, which can be achieved by driving phase transitions using kinetic principles and chemical reactions. This approach allows for the manipulation of material structure and properties through polymerizations or chemical binding, resulting in nano- and multiscale changes. Kinetically driven processes have applications in various fields, including separation membranes, biomolecular condensates, cell mobility, and the self-assembly of polymers and colloids.
ACCOUNTS OF MATERIALS RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Jensen N. Sevening, Siyana Dottin, Vincent M. Torres, Robert J. Hickey
Summary: This study demonstrates a versatile method for preparing soft hybrid elastomers by synthesizing polymer grafted nanoparticles (PGNPs) covalently bound to a rubbery matrix using reaction-induced phase transitions (RIPT). The increase in nanoparticle loading leads to the formation of PGNP aggregates and an increase in modulus, while having minimal impact on elastic recovery. The RIPT process is easily adaptable to crosslinked rubbery matrices, highlighting its versatility.
Article
Polymer Science
Tylene Hilaire, Yifan Xu, Wenwen Mei, Robert A. Riggleman, Robert J. Hickey
Summary: This study demonstrates that the addition of BCF to a solution containing PDPPS can induce phase transitions. Macrophase separation occurs if PDPPS is a homopolymer, while micelles are formed if PDPPS is a block in a copolymer. The phase transition is hypothesized to be a result of the interaction between PDPPS and BCF. A modified Flory-Huggins model was used to predict the phase behavior of a ternary system, and the experimental results confirm the accuracy of the model.
Article
Materials Science, Multidisciplinary
Wenwen Mei, Deyang Yu, Christy George, Louis A. Madsen, Robert J. Hickey, Ralph H. Colby
Summary: Maximizing ion conduction in single-ion-conducting ionomers is crucial for energy-related technologies. Understanding the impact of anion chemical composition on ion conduction emphasizes the necessity of minimizing ion aggregation through the rational choice of anion chemical composition.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Physical
Houman Honaryar, Jacob A. LaNasa, Robert J. Hickey, Julian C. Shillcock, Zahra Niroobakhsh
Summary: In this study, a ternary phase diagram for a system of cationic surfactant cetylpyridinium chloride monohydrate (CPCl), a polar oil (oleic acid), and water is established using experiment and simulation. The phase behavior and properties of the self-assembled materials are investigated through visual inspection, small-angle X-ray scattering (SAXS), and rheological measurements. Dissipative particle dynamics (DPD) simulation is used to support the experimental results and predict the formation of different mesostructures. The findings provide insights into the self-assembly process of associating surfactant systems and offer new avenues for liquid-in-liquid 3D printing applications.