Article
Chemistry, Physical
Chao Feng, Jiaxing Huang, Peihui Yan, Fei Wan, Yunfei Zhu, Hao Cheng
Summary: The research on the application of polypyrrole materials in cement composites shows that adding waterborne polypyrrole can improve conductivity and compactness, optimize microstructure, and inhibit the formation of Ca(OH)2.
Article
Polymer Science
Rizwan Ullah, Nadia Khan, Rozina Khattak, Mehtab Khan, Muhammad Sufaid Khan, Omar M. Ali
Summary: The current research focused on the super capacitive behavior of organic conducting polymer, i.e., polypyrrole (PPy) and its composites with gum arabic (GA). The synthesized composites material showed high thermal stability and compact morphology. The electrochemical properties of the composites exhibited impressive specific capacitance and high energy density.
Article
Chemistry, Physical
Ting-Ting Li, Xiangdong Fu, Xuefei Zhang, Bing-Chiuan Shiu, Jia-Horng Lin, Ching-Wen Lou
Summary: This study proposes a low-cost and easy-to-prepare fibrous zinc ion battery negative electrode with excellent flexibility and electrochemical stability. The electrode demonstrates high specific capacity and energy density, and maintains stable performance even after repeated charge-discharge cycles and bending.
SURFACES AND INTERFACES
(2022)
Article
Polymer Science
Tina Hsia, Jing Wan, Bo Fan, San H. Thang
Summary: The development of a new bifunctional reversible addition-fragmentation chain transfer (RAFT) agent allows for the synthesis of polymers with predetermined molecular weights and low dispersibilities, while also providing functionalities at both polymer termini that allow strong binding to graphene oxide (GO). By controlling the bifunctional RAFT agent, acrylonitrile-styrene-acrylate (ASA) copolymers with different types of acrylates have been synthesized, enabling access to polymers with diverse thermal and mechanical properties. The strong binding between GO and the synthesized polymers has been verified, leading to the preparation of polymer/GO composites with varied tensile strengths and conductivity properties similar to semiconductors.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Polymer Science
Rizwan Ullah, Mehtab Khan, Rozina Khattak, Nadia Khan, Muhammad Sufaid Khan, Yaser A. El-Badry
Summary: An in-situ chemical oxidative method was employed to synthesize a high-performance PPy/ZrO2 composite supercapacitor material. Characterization using different analytical techniques revealed the composite material's high capacitance, energy density, and stability.
Article
Spectroscopy
Jilan S. Ibrahim, Neamat Hanafi, Tarek A. El-Tayeb, Mahmoud A. Sliem
Summary: The structure, optical properties, and cytotoxic effects of polypyrrole-gold nanocomposites as photothermal nanoagents were studied. The surface coating of Au NRs enhanced the photothermal efficiency. The photothermal conversion efficiency was tested using a specific light source.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Materials Science, Multidisciplinary
Sebastian Balser, Johannes Bernd, Leoni Fritsche, Andreas Terfort
Summary: In this study, highly conductive and biorepulsive polymer films were deposited onto gold surfaces through electrochemical polymerization of a polyglycerol-modified pyrrole derivative. The thickness of the films was determined by current density and time, and the growth process was self-terminated. The films were characterized using various techniques and exhibited biorepulsive properties, even at low thicknesses. This opens up opportunities for their application in bioelectrical devices.
ACS APPLIED POLYMER MATERIALS
(2022)
Review
Materials Science, Textiles
Yunfan Long, Yongjun Deng
Summary: Carbon fiber paper (CP) was prepared using wet forming technology, and liquid-phase polypyrrole/carbon fiber paper matrix composites (LPPY/CF) and gas-phase polypyrrole/carbon fiber paper matrix composites (GPPY/CF) were prepared by liquid-phase polymerization and gas-phase polymerization on CP, respectively. The effects of dopant, oxidant, solubility of pyrrole (PY) and ferric trichloride (FeCl3) on the resistivity of LPPY/CF and GPPY/CF were discussed. The mechanical properties, hydrophobicity, electrical conductivity, and heating properties of CP, LPPY/CF, and GPPY/CF were compared. The results showed significant improvements in resistivity, mechanical properties, hydrophobicity, electrical conductivity, and heating properties in LPPY/CF and GPPY/CF compared to CP.
FIBERS AND POLYMERS
(2023)
Article
Chemistry, Physical
Quanlu Wang, Changxing Han, Guoxiang Tang, Lei Liu, Tingxi Li, Yongqin Han
Summary: Polymerization of polypyrrole (PPy) on the surface of ZnCo-MOF columnar structure is achieved using (NH4)2S2O8 and AgNO3 as co-oxidants. The resulting ternary composite material, ZnCo-MOF/PPy/Ag2O, demonstrates successful PPy polymerization, multifunctional properties of ARS, and catalytic oxidation of Ag. The MPA/Ag2O-4 electrode exhibits excellent specific capacitance, and an asymmetric supercapacitor assembled with MPA/Ag2O-4 and activated carbon shows high area capacitance and wide potential window. The composite material also displays outstanding cycling stability and flexibility, making it a promising candidate for flexible wearable and portable electronic devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
K. A. Darwish, O. M. Hemeda, M. I. Abdel Ati, Anwer S. Abd El-Hameed, Di Zhou, Moustafa A. Darwish, M. M. Salem
Summary: This study evaluates the electromagnetic properties of hybrid materials made from polypyrrole (PPy) and barium hexaferrite (HF) for potential use in electromagnetic interference (EMI) shielding applications. The addition of 25% HF content produces the most stable and efficient composite for absorbing EM waves in the X-band. This research demonstrates the potential of conductive polymer composites for EMI shielding applications and provides insights into designing more efficient EMI shielding materials through optimizing the composition and characterizing the EM properties of the PPy/HF composite.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Review
Engineering, Environmental
Nazmul Abedin Khan, Mahmud Hassan, Hye Jin Lee, Sung Hwa Jhung
Summary: This report reviewed the recent advances in preparation and characterization of pADC and pPDC materials, and discussed their applications in adsorptive removal/separation of various chemicals from water, liquid fuel, and air. The adsorption results were explained in terms of maximum adsorption capacities, adsorbate-adsorbent interactions, and regeneration of pADC or pPDC adsorbents for recyclability.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Textiles
Yuanjun Liu, Yi Wang
Summary: The study investigated the effect of pyrrole concentration and type of doping agents on the dielectric properties and conductivity of the polypyrrole/polyester-cotton composites. Results showed that the composite exhibited the best performance at a pyrrole concentration of 0.9 mol/L. Among the tested doping agents, sodium dodecyl benzene sulfonate was found to provide the highest polarization ability, dissipation ability, and electromagnetic wave absorption-attenuation ability, as well as the lowest surface resistance and strongest conductivity.
TEXTILE RESEARCH JOURNAL
(2021)
Article
Chemistry, Physical
Xingtian Chen, Di Zhang, Huaiyin Chen, Ruoyu Hong
Summary: A new ternary core-shell composite, CIP@Fe3O4@PANI, has been successfully prepared with superior magnetic properties, oxidation resistance, high saturation magnetization, making it a promising candidate for rapid development of broadband shielding and anticorrosive materials.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Forestry
Tianyuan Chen, Qichao Ma, Yudong Li, Guoliang Li
Summary: This study proposes a new wood composite material for repairing wooden relics, exposed outdoor wooden buildings, and household panels. The composite material mimics the hydrophobicity of lotus leaves and the strong adhesion of mussel proteins, and has mechanical properties that are close to 97% of undamaged wood.
Article
Green & Sustainable Science & Technology
Haipeng Sun, Zhen Liu, Xingqiang Liu, Changlin Yu, Longfu Wei
Summary: In this study, Ppy/Bi2MoO6 microsphere photocatalysts were successfully prepared by adjusting the content of conducting polymer polypyrrole (Ppy). Characterization and electrochemical tests revealed that the introduction of Ppy enhanced the crystallinity and specific surface area of Bi2MoO6, leading to improved migration rate and utilization efficiency of photogenerated carriers. The Ppy/Bi2MoO6 microsphere photocatalyst exhibited excellent photocatalytic performance in the degradation of high concentration of Rhodamine B (RhB) and efficient removal of mixed dyes.
MATERIALS TODAY SUSTAINABILITY
(2022)
Article
Physics, Multidisciplinary
Ying Liu, Yue Liu, Michael G. B. Drew
Summary: The quarter-wavelength model suggests that the reflection of microwaves can be minimized by adjusting the film thickness to m lambda/4, where m is an odd integer and lambda is the wavelength within the film. However, this study challenges the validity of the model and proposes an alternative approach based on wave superposition principles. The study also criticizes the inappropriate use of certain concepts in current mainstream microwave absorption theory, such as the characterization of microwave absorption using reflection loss RL from materials.
Article
Thermodynamics
Ying Liu, Yue Liu, Michael G. B. Drew
Summary: The study of the Gibbs-Duhem equation and its applications is one of the most difficult topics in thermodynamics. This paper presents a novel mathematical derivation that is shown to be more natural, direct, and intuitive than the traditional thermodynamic derivation. By introducing Legendre transformations, multiple perspectives for problem-solving are provided.
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Ying Liu, Yue Liu, Michael G. B. Drew
Summary: For many years, it has been common practice to use reflection loss defined for devices to characterize materials, which has caused many problems. By replacing the flawed theory of impedance matching with wave superposition theory and using simple geometry to represent film absorption, the real mechanism of film absorption has been revealed. It is shown that film and material are different, and absorption efficiency is influenced by factors such as wave superposition and energy conservation.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Ying Liu, Yue Liu, Michael G. B. Drew
Summary: This section discusses the application of impedance matching and quarter-wavelength theories in microwave absorption research, pointing out their flaws and proposing a new theory to replace the quarter-wavelength theory.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Ying Liu, Yue Liu, Michael G. B. Drew
Summary: Energy conservation is crucial for understanding the mechanism of microwave absorption by films. In the past, confusion between films and materials has caused many issues. By considering energy conservation, the differences between films and materials are clarified, and some difficult issues have been explained.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Physics, Applied
Ying Liu, Michael G. B. Drew, Yue Liu
Summary: In the previous Part I, it was demonstrated using transmission-line theory that impedance matching theory should be replaced by wave cancellation theory. It was also shown that film is different from the material and phase effects from interfaces should be considered in quarter wavelength theory. In this Part, it is proven that energy penetration in a film cannot be defined and impedance matching is flawed as it lacks theoretical proof and consistency with experimental data. The multiple absorption peaks in a film arise from wave cancellation under the constraint of energy conservation, rather than resonances from the material.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
Ying Liu, Michael G. B. Drew, Yue Liu
Summary: This study theoretically confirms that the absorption mechanism in a film, responsible for the minima of the reflection loss (RL/dB), is best explained by wave cancelation theory rather than by impedance matching theory. The study also reveals that the mechanisms for a film and material are different. In addition, the flaws of neglecting the phase effects of interfaces in a film in quarter-wavelength theory are quantitatively discussed.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Condensed Matter
Ying Liu, Xiangbin Yin, Michael G. B. Drew, Yue Liu
Summary: By analyzing experimental data, this study provides new theoretical perspectives on the inadequacies of impedance matching theory in the field of microwave absorption. It suggests that the current theories related to impedance matching need to be replaced by wave cancellation theory, as even different criteria cannot solve the problems with impedance matching. The analysis in this work supports the new theories against the current ones by applying to published data and determining the conditions for the minima of reflection loss at large values of |Zin - Z0| through transmission-line theory.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Chemistry, Physical
Ying Liu, Yi Ding, Yue Liu, Michael G. B. Drew
Summary: It is commonly believed that two synergistic effects maximize microwave absorption power of a film - increasing the absorption power of the material and the penetration of incident microwaves into the film. However, this reasoning is incorrect as it confuses material with film and is not consistent with the real absorption mechanism. By differentiating film from material, it is shown that reflection loss (RL) is relevant only for film and the real mechanism involves balancing the intensities of the two beams reflected from the film's interfaces when they are out of phase by π. It is commonly believed incorrectly that maximum absorption from film occurs when the resultant beam reflected back to open space from the metal-back interface is weakest. But it is shown here that the opposite is true - maximum absorption occurs when this reflected beam reaches its maximum. A definition for film in the context of microwave absorption is proposed.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Physical
Ying Liu, Yi Ding, Yue Liu, Michael G. B. Drew
Summary: Part 1 of this work demonstrates that film absorption is based on wave cancellation theory (WCT) rather than the mechanism of material attenuation power and impedance matching theory (IM). The film thickness and material properties affect the pattern of the reflection loss curve and the occurrence of multiple absorption peaks. Maximum absorption occurs when the two reflected beams are out of phase by & pi; at the front of the film, regardless of whether the film has a metal back or not. WCT explains the deviations of maximum absorption positions from the predicted values of IM.
SURFACES AND INTERFACES
(2023)
