Article
Chemistry, Multidisciplinary
Mahyar Dehdast, Mehdi Neek-Amal, Catherine Stampfl, Mahdi Pourfath
Summary: Comprehensive first-principles calculations were conducted to study the electronic and plasmonic properties of biaxially strained monolayer carbon phosphide (beta-CP). It was found that compressed beta-CP hosts strong anisotropic Dirac-shaped fermions and exhibits an ultra-wide hyperbolic window from terahertz to mid-visible frequencies. The study sheds new light on the unique properties of hyperbolic two-dimensional materials and their potential applications in anisotropic light control.
Article
Biochemistry & Molecular Biology
Karla Begonia Cervantes-Diaz, Martin Drobek, Anne Julbe, Andre Ayral, Julien Cambedouzou
Summary: Photocatalytically active mesoporous silicon carbide (SiC) layers were synthesized and showed efficient degradation of organic pollutants under UV light irradiation. The SiC-based materials offer promising potential for the development of efficient photocatalytic membrane reactors for water treatment.
Article
Chemistry, Physical
Kento Murota, Takumi Saito
Summary: The study found that water in confinement becomes more structured and the surface charge density decreases with decreasing pore size, especially when the pores are smaller than 4 nanometers. Additionally, there is a correlation between the electrostatics near the surface and surface reactions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Composites
Xue Cui, Rong-rong Zheng, Jing-ying Wang, Shu-wu Chen, Yang Yu, Li-ying Guo, Cheng Wang, Li-yan Wang, Xuehua Ruan
Summary: Mesoporous low dielectric polyimide films were prepared by incorporating controlled hollow mesoporous SiO2 nanomicrospheres. The addition of hollow mesoporous SiO2 improved the thermal stability, mechanical properties, and hydrophobicity of the composite films, leading to a decrease in dielectric constant.
POLYMER COMPOSITES
(2023)
Review
Engineering, Electrical & Electronic
Jeeban Kumar Nayak, Partha Roy Chaudhuri, Satyajit Ratha, Mihir Ranjan Sahoo
Summary: This article presents a review of various Effective Medium Theories (EMT) and their progressive developments, as well as different mixture formulae used to calculate the effective permittivity for different composites. The article covers topics such as Maxwell Garnett (MG) EMT, Bruggeman (Br) EMT, Bragg-Pippard (BP) EMT, Strong Property Fluctuation Theory (SPFT), and different mixture formulae used for colloidal solutions, gas mixtures, solvent mixtures, and electrolyte solutions.
JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS
(2023)
Article
Thermodynamics
Meijie Chen, Dan Pang, Xingyu Chen, Hongjie Yan
Summary: Dielectric microsphere coatings are increasingly being utilized for passive daytime radiative cooling due to their potential in mass production and low cost. By studying the relationship between microsphere parameters and PDRC performance, it is possible to achieve optimal cooling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Multidisciplinary
Jean-Francois Dayen, Nikita Konstantinov, Marlene Palluel, Nathalie Daro, Bohdan Kundys, Mohamed Soliman, Guillaume Chastanet, Bernard Doudin
Summary: Research has shown that using a graphene underlayer to reveal light-induced heating can trigger spin transition in molecules, opening up new possibilities for the potential use of spin crossover materials in room temperature optoelectronic applications.
MATERIALS HORIZONS
(2021)
Article
Materials Science, Ceramics
YongJin Kim, SangHyuk Yoo, Hyung Gyu Lee, Yoonjin Won, Jimin Choi, Keonwook Kang
Summary: The porosity of silica aerogel is the main parameter that determines the dielectric constant, and it should be at least 0.76 to achieve a very low dielectric constant of 1.5. Additionally, while maintaining the porosity of 0.76, the silica aerogel needs to be designed in an ordered open pores structure (OOPS) containing 64 or more pores positioned in a simple cubic lattice point to endure the required elastic modulus of 8 GPa to prevent delamination.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Hasina Akther, A. H. Bhuiyan, Humayun Kabir, Rahima Nasrin, M. Mahbubur Rahman
Summary: The article presents a comprehensive analysis on vacuum deposited Iodine-doped plasma polymerized monomer N, N, 3, 5 tetramethylanilin (PPTMA) thin film coatings to comprehend the structural, morphological, chemical, optical, and electronic properties. The as-deposited PPTMA thin film coatings were characterized by various techniques, showing smooth and uniform surfaces, with unique structural and optical changes due to iodine doping. The study also revealed that the properties such as energy band gaps, refractive index, and dielectric constants were influenced by the increasing iodine content in PPTMA coatings.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Instruments & Instrumentation
Nikita V. Penkov, Nadezda A. Penkova
Summary: This study proposes a theoretical model based on the fundamental principles of electrodynamics of continuous media to address the dielectric properties of heterogeneous systems with filamentary inclusions. The model is relevant for studying biopolymer solutions using electrical impedance spectroscopy and other spectroscopic techniques. It has been successfully validated on a DNA solution in the terahertz region.
APPLIED SPECTROSCOPY
(2021)
Article
Engineering, Electrical & Electronic
Ashish Raturi, Poornima Mittal, Sudhanshu Choudhary
Summary: This work investigates the effect of plasmonic-metal doping on the structural, electronic, and optical properties of Strontium Titanate through first-principles calculations. The absorption of the material can be extended towards the visible region by reducing the band gap through doping with plasmonic-metals. The doped structures show improved optical and photocatalytic properties, making them potential candidates for optoelectronic applications.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Materials Science, Ceramics
Jiaojiao Du, Wenjie Dai, Haijiang Kou, Pengfei Wu, Weiliang Xing, Yuzhuo Zhang, Chao Zhang
Summary: In this paper, AlN coatings were deposited on Cu substrates for the first time to maintain high thermal conductivity and obtain excellent electrical properties. By adjusting the duty cycles, the microstructure, thermal conductivity, and electrical properties of the AlN/Cu systems were controlled. The AlN/Cu systems improved the thermal conductivity of Cu and exhibited high resistivity and low dielectric loss. The minimum dielectric constant of the coating at 2000 kHz frequency was 5.6. These systems meet the requirements for high-power integrated circuit packaging.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Kento Murota, Yoshio Takahashi, Takumi Saito
Summary: Studies were conducted to investigate the adsorption of Cs+ and Sr2+ ions on mesoporous silicas with different pore size distributions. The results showed that the adsorption of Sr2+ was not significantly affected by the pore size, while that of Cs+ was higher for silicas with larger fractions of micropores. X-ray absorption fine structure analysis revealed that both ions formed outer-sphere complexes with the mesoporous silicas. Adsorption experiments were analyzed using a surface complexation model and it was found that the equilibrium constant for the adsorption of Sr2+ was constant regardless of the pore size, whereas that of Cs+ increased with decreasing pore size.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Engineering, Environmental
Ting Wu, Zhifeng Liu, Binbin Shao, Qinghua Liang, Qingyun He, Yuan Pan, Xiansheng Zhang, Yang Liu, Jingwen Sun, Shanxi Gong
Summary: The hollow part with macroporous size in hollow tubular g-C3N4 is difficult to function in photochemical reactions. To address this issue, tubular g-C3N4 with mesoporous-rich non-hollow filling was prepared, which increased reactive sites, enhanced visible light response, and facilitated charge separation and transfer.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Hodam Karnajit Singh, Prajna P. Mohapatra, Somnath Sahu, Pamu Dobbidi
Summary: In this study, Al3+ substituted polycrystalline Ba0.4La0.1Sr0.5AlxFe12-xO19 hexaferrite samples were prepared using the solid-state method. The structural, morphology, dielectric, and temperature dependent magnetic properties were systematically studied. The results showed that Al3+ substitution led to a decrease in lattice parameters, a shift in Raman peaks, and a decrease in complex dielectric constant. Additionally, the saturation magnetization decreased, the magnetic anisotropy constant decreased, and the anisotropy field and coercivity increased with increasing temperature and Al3+ concentration. The analysis using Bloch's spin wave theory deviated from the expected behavior, but Dyson's approximation fitted well with the experimental data. The samples exhibited uniaxial hexagonal crystal symmetry, making them suitable for permanent magnets and microwave applications.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Optics
Tiphaine Galy, Laurent Pilon
Summary: This study evaluates the impact of dependent scattering and particle overlapping on the integral radiation characteristics of fractal aggregates. It finds that dependent effects are more significant in the scattering cross-section and asymmetry factor, while particle overlapping has a negligible effect on the integral radiation characteristics. The study also proposes an approximation method for predicting the radiation characteristics of aggregates consisting of particles with certain conditions.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2022)
Article
Chemistry, Applied
Michal Marszewski, Ali Dashti, Patricia E. McNeil, Maggie Fox, Vivian Wall, Danielle M. Butts, Sophia C. King, Glareh N. Kashanchi, Sarah H. Tolbert, Bruce Dunn, Laurent Pilon
Summary: This study reports and analyzes the effective Young's modulus and hardness of nanoparticle-based silica aerogels and xerogels for the first time. It was found that the effective hardness is linearly proportional to the effective Young's modulus. Deposition of an alumina coating was demonstrated as a way to increase the hardness of these mesoporous monoliths.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Physical
Abhinav Bhanawat, Keyong Zhu, Laurent Pilon
Summary: This paper systematically investigates the effect of gas bubble formation on the performance of a horizontal photoelectrode during photoelectrochemical water splitting. The presence of hydrogen or oxygen gas bubbles increases back-scattering losses, resulting in a decrease in photocurrent density. The normal-hemispherical reflectance of the photoelectrode is found to be independent of the bubble diameter and size distribution, but significantly varies with the bubble contact angle and projected surface area coverage. The area-averaged absorptance in a bubble-covered photoelectrode reduces by up to 18% compared to a bare photoelectrode. Hydrophilic photoelectrodes or coatings can improve the performance of large photoelectrodes.
SUSTAINABLE ENERGY & FUELS
(2022)
Article
Chemistry, Physical
Rebecca C. Vincent, Yunkai Luo, Jessica L. Andrews, Arava Zohar, Yucheng Zhou, Qizhang Yan, Eve M. Mozur, Molleigh B. Preefer, Johanna Nelson Weker, Anthony K. Cheetham, Jian Luo, Laurent Pilon, Brent C. Melot, Bruce Dunn, Ram Seshadri
Summary: Mo4O11 has been studied as a fast-charging electrode in Li-ion batteries. It demonstrates high-rate cycling and low capacity fade due to its newly formed layered structure.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Sun Woong Baek, Muna Saber, Anton Van der Ven, Laurent Pilon
Summary: This paper reviews the thermodynamic relationships relevant to the interpretation of potentiometric entropy measurements on lithium-ion batteries. It analyzes the contributions of different excitations to the entropy, and provides a guide for interpreting open circuit voltage measurements and entropic potential measurements. The interpretations are illustrated with experimental data for different battery electrode materials, and the systematic interpretation can enhance other structural analysis techniques.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Kira E. Wyckoff, Jonas L. Kaufman, Sun Woong Baek, Christian Dolle, Joshua J. Zak, Jadon Bienz, Linus Kautzsch, Rebecca C. Vincent, Arava Zohar, Kimberly A. See, Yolita M. Eggeler, Laurent Pilon, Anton Van der Ven, Ram Seshadri
Summary: In this study, LiScMo3O8 was investigated as a potential anode material for Li+-ion batteries due to its unique metal-metal bonding structure, which allows for stable and reversible Li+(de)insertion.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Biotechnology & Applied Microbiology
Jack Hoeniges, William Welch, Jeremy Pruvost, Laurent Pilon
Summary: The use of external mirrors can increase the solar flux and biomass productivity in outdoor raceway ponds for microalgae cultivation. Configuration C, with a single north mirror, is considered to be the simplest and most cost-effective method to increase raceway productivity, with a potential yield increase of up to 73% in the winter months.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2022)
Article
Chemistry, Physical
Yucheng Zhou, Etienne Le Calvez, Sun Woong Baek, Matevz Frajnkovic, Camille Douard, Eric Gautron, Olivier Crosnier, Thierry Brousse, Laurent Pilon
Summary: This study compares the performance of lithium-ion battery electrodes made of Ti2Nb2O9 microparticles or nanoparticles synthesized by different methods. The results show that nanoparticles exhibit larger capacity, smaller polarization, better capacity retention, and faster lithium ion transport. Additionally, nanoparticles have smaller overpotential, lower resistive losses, and higher electrical conductivity.
ENERGY STORAGE MATERIALS
(2022)
Article
Thermodynamics
Eylul Simsek, Megan J. Williams, Jack Hoeniges, Keyong Zhu, Laurent Pilon
Summary: This study investigates the impact of water droplets on the efficiency of solar energy conversion systems. Experimental and numerical methods were used to analyze the transmission and reflection of infrared radiation through windows covered with water droplets. The results showed that the position, contact angle, and surface coverage of the droplets significantly affected the transmittance and reflectance of the systems.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Vivian Wall, Sophia C. King, Glareh Natalie Kashanchi, Suixuan Li, Man Li, Tiphaine Galy, Darrell I. Harry, Susan E. Ju, Michal Marszewski, Laurent Pilon, Yongjie Hu, Sarah H. Tolbert
Summary: This work investigated the impact of nanoparticle size on the thermal conductivity of mesoporous silica materials. The experiments involved synthesizing porous thin films with varying porosities by adjusting the ratio of polymer to silica. The thermal conductivity of the films was measured and the results indicated a weak dependence on particle size, which was attributed to increased interfacial scattering of heat carriers at the boundaries of smaller nanoparticles.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Matevz Frajnkovic, Ampol Likitchatchawankun, Camille Douard, Yucheng Zhou, Sun Woong Baek, Ivan Catton, Olivier Crosnier, Thierry Brousse, Laurent Pilon
Summary: This study investigates the effect of cation species on the onset of electrolyte hydrolysis in hybrid supercapacitors. The results show that different cations with different stable operating potential windows can affect the timing of hydrolysis onset, which may be related to the differences in hydration shells around the cations.
JOURNAL OF POWER SOURCES
(2022)
Article
Nanoscience & Nanotechnology
Refet Ali Yalcin, Thomas Lee, Glareh Natalie Kashanchi, Johannes Markkanen, Ricardo Martinez, Sarah H. Tolbert, Laurent Pilon
Summary: This study demonstrates both numerically and experimentally that dependent scattering occurs in colloidal suspensions and can lead to an increase in transmittance with increasing particle volume fraction. The study also presents a method to accurately account for the effects of dependent scattering.
Article
Chemistry, Physical
Glareh N. N. Kashanchi, Sophia C. C. King, Susan E. E. Ju, Ali Dashti, Ricardo Martinez, Yu-Keng Lin, Vivian Wall, Patricia E. E. McNeil, Michal Marszewski, Laurent Pilon, Sarah H. H. Tolbert
Summary: Silica-based aerogels are a cost-effective solution for improving insulation efficiency and reducing energy consumption. High porosity and small pore sizes are essential material properties, but they are usually directly linked. This study utilized preformed silica colloids to explore methods of reducing pore size while maintaining high porosity.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Abhinav Bhanawat, Laurent Pilon
Summary: This study quantifies the optical losses caused by hydrogen or oxygen bubbles released during photoelectrochemical water splitting and analyzes their effects on the photoelectrode absorptance and efficiency. The results suggest that decreasing bubble diameter and increasing bubble volume fraction and plume thickness lead to decreased absorptance and efficiency. Strategies such as increasing bubble departure diameter and reducing plume thickness can minimize the optical losses. Illuminating the PEC cell from the anode side may also be beneficial.
SUSTAINABLE ENERGY & FUELS
(2023)
Article
Chemistry, Physical
Sun Woong Baek, Kira E. Wyckoff, Daniel D. Robertson, Matevz Frajnkovic, Yucheng Zhou, Sarah H. Tolbert, Ram Seshadri, Laurent Pilon
Summary: (W0.2V0.8)3O7 nanoparticles exhibit superior electrochemical performance compared to microparticles, as they undergo a two-phase coexistence over a narrower range of compositions and have a smaller irreversible heat generation rate. This is attributed to the fact that nanoparticles are less ionically resistive, able to accommodate more lithium, and have more kinetically favorable lithium-ion intercalation.
ACS APPLIED ENERGY MATERIALS
(2023)
