Article
Chemistry, Physical
Jongsuk Lee, Yan Chen, Hong Liang, Sunghan Kim
Summary: The temperature-dependent viscosity of nanofluids consisting carbon-based nanoparticles (CBNs) was investigated with steady-shear viscometry. The study found that the viscosity of nanofluids decreased until 30 degrees C and increased thereafter, with CBN nanofluids having lower dynamic viscosity than the base fluid. The size of percolation participants and their interaction with nanoparticles influenced the behavior of nanofluids, resulting in a reduction in dynamic viscosity.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Aerospace
Gianluigi Bovesecchi, Sandra Corasaniti, Girolamo Costanza, Fabio Piccotti, Michele Potenza, Maria Elisa Tata
Summary: A nanofluid is a suspension of nanoparticles in a liquid base fluid and can be used as a working fluid in heat exchangers. There are various physical phenomena that affect heat conduction in nanofluids, such as clusters, the formation of adsorbate nanolayers, scattering of phonons, Brownian motion, and thermophoresis. Developing a theoretical model that accurately considers all these phenomena for different parameter values is challenging. This study aims to find the conditions under which certain phenomena prevail over others and provide a quantitative tool for selecting the appropriate theoretical model.
Article
Physics, Condensed Matter
Jyoti Gupta, Brijesh Kumar Pandey, D. K. Dwivedi, Saurav Mishra, Ratan Lal Jaiswal, Satyabrat Pandey
Summary: The thermal conductivity of nanofluid was measured using an ultrasonic interferometer and Bridgman's equation. The study found that the thermal conductivity of nanofluid is dependent on the base fluid, with the highest conductivity observed in equal proportions of water and ethylene glycol. Measurements were taken at concentrations of 0.05%, 0.1%, and 0.2% within a temperature range of 30℃ to 80℃. The thermal conductivity of the prepared nanofluids showed a significant increase compared to previous research, suggesting their potential use in heat transfer systems.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Chemistry, Physical
Harsharaj B. Parmar, Hamid Fattahi Juybari, Yashwant S. Yogi, Sina Nejati, Ryan M. Jacob, Prashant S. Menon, David M. Warsinger
Summary: The addition of carbon nanotubes in nanofluids results in consistent and wide-ranging improvements, while the addition of copper oxide particles shows diminishing returns after a concentration of 0.7%. Furthermore, it was discovered that enhancing the performance of MD systems can be achieved by uniformly dispersing nanoparticles in nanofluids and stabilizing them with surfactants.
Article
Engineering, Chemical
Zilu Liu, Bingtao Tang, Shufen Zhang
Summary: A PVP/PEG/Cu nanocomposite was successfully synthesized using a one-pot method and dispersed in water to prepare aqueous nanofluids. The nanofluids showed improved convective heat transfer coefficient and similar viscosity to pure water. The PVP and PEG shell enhanced the thermal cycle stability by isolating the Cu cores from the environment. The properties and dispersion mechanism of the nanofluids were investigated using various characterization techniques.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Physics, Condensed Matter
Jyoti Gupta, Brijesh Kumar Pandey, D. K. Dwivedi, Saurav Mishra, Ratan Lal Jaiswal
Summary: To explain heat conduction mechanism in nanofluids, existing models have been analyzed but none of them accurately predict the variation of thermal conductivity with volume concentration. In this study, the static and dynamic contributions of nanoparticles in the base fluid are found to be responsible for its conductivity. A new model, which incorporates the effects of nanoparticle shape, size, allocation, temperature, junction layer, congregate pattern, and Brownian diffusion, is proposed to predict the exact mechanism of thermal conductivity of nanofluids. The proposed model shows good agreement with experimental data when applied to various nanofluids at different volume concentrations.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Chemistry, Applied
Raviteja Surakasi, Srujana Sripathi, Sarada Purnima Nadimpalli, Sibtain Afzal, Bharat Singh, Manoj Tripathi, Rahel Alemu Hafa
Summary: This study focuses on nanofluids made of TiO2 and multiwalled carbon nanotubes, exploring their stability and surface modification approaches. It provides an in-depth analysis and evaluation in this field.
ADSORPTION SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Mississippi M. Bhunia, Karamjyoti Panigrahi, Chandra B. Naskar, Souvik Bhattacharjee, Kalyan K. Chattopadhyay, Paramita Chattopadhyay
Summary: Rutile TiO2 nanoparticles with high dielectric constant are a preferred nanofiller for transformer oil nanofluids, enhancing breakdown voltage and thermal conductivity. The use of TiO2 also reduces acidity and viscosity in nanofluids due to its specific properties, making it a promising candidate for efficient nanofluid development.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Abdul Rehman, Sana Yaqub, Majid Ali, Hassan Nazir, Nadia Shahzad, Sehar Shakir, Rabia Liaquat, Zafar Said
Summary: This study investigates the influence of eight surfactants on the properties of hybrid nanofluids containing Aluminum oxide (Al2O3) and Titanium dioxide (TiO2). The results show that polyvinylpyrrolidone (PVP) exhibits the highest stability among all surfactants, while polyethylene glycol (PEG) shows the highest viscosity enhancement. Additionally, all the nanofluids exhibit Newtonian behavior. The study emphasizes the potential of PVP as a surfactant for long-term heat transfer applications.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Thermodynamics
Mahyar Ashouri, Mohammad Mehdi Zarei, Ali Hakkaki-Fard
Summary: The study found that Al2O3-water nanofluid has the highest heat transfer rate, and the eccentricity, spacing, and thickness of the fins significantly affect heat transfer performance. Additionally, the optimal heat transfer rate of fins changes as the Rayleigh number decreases.
HEAT TRANSFER ENGINEERING
(2021)
Article
Engineering, Chemical
Reza Bakhtiari, Babak Kamkari, Masoud Afrand, Ali Abdollahi
Summary: The study investigated the thermal conductivity coefficient variation of TiO2-Graphene/Water hybrid nanofluid, showing that an increase in temperature and volume fraction enhances thermal conductivity. The effect of volume fraction on thermal conductivity was found to be larger than the effect of temperature, particularly at higher temperatures. A model was proposed to predict the thermal conductivity of nanofluids with a small margin of error, indicating good compatibility with experimental data.
Article
Materials Science, Multidisciplinary
Manju Joseph, B. Anugop, K. R. Vijesh, Vipin Balan, V. P. N. Nampoori, M. Kailasnath
Summary: Nanofluids with suitable heat transfer properties have been found to be applicable in various fields. The heat transfer properties of these nanofluids are affected by the particle size, morphology, and concentration of nanoparticles. Different morphologies of zinc oxide nanofluids were synthesized and evaluated for their thermal properties. The findings suggest that casein-capped zinc oxide nanofluids exhibit excellent thermal insulation properties and have potential applications in thermal-related industries.
Article
Thermodynamics
S. N. M. Zainon, W. H. Azmi
Summary: The study found that the green Bio-glycol based TiO2-SiO2 nanofluids exhibit good stability and enhanced thermal conductivity. However, there is minimal change in dynamic viscosity with temperature.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Mostafa Nejatolahi, Ali Akbar Golneshan, Reza Kamali, Samad Sabbaghi
Summary: This study estimates the upper and lower physical limits for the thermal conductivity of nanofluids by considering the effects of different mechanisms. It also introduces the interference of nanolayer and thermal boundary resistance on the thermal conductivity of nanofluids as a new phenomenon.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Green & Sustainable Science & Technology
Dinesh Kumar Madheswaran, S. Vengatesan, Edwin Geo Varuvel, T. Praveenkumar, Selvaraj Jegadheeswaran, Arivalagan Pugazhendhi, J. Arulmozhivarman
Summary: This review critically examines the application of nanofluids as coolants in PEMFCs and elucidates their thermal efficiency enhancement mechanisms. The findings reveal remarkable enhancements in heat transfer and the potential to revolutionize cooling systems, but challenges and further research are also identified.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Physical
Sergey Yu. Ketkov, Sheng-Yuan Tzeng, Elena A. Rychagova, Anton N. Lukoyanov, Wen-Bih Tzeng
Summary: Metallocenes, including methylcobaltocene, play important roles in various fields of chemistry. The ionization energy and vibrational structure of (Cp ')(Cp)Co can be influenced by introducing methyl substituents. The mass-analyzed threshold ionization spectrum and DFT calculations provide accurate information about the properties and transformations of (Cp ')(Cp)Co.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Review
Chemistry, Physical
Qifeng Mu, Jian Hu
Summary: Polymer mechanochemistry has experienced a renaissance due to the rapid development of mechanophores and principles governing mechanochemical transduction or material strengthening. It has not only provided fundamental guidelines for converting mechanical energy into chemical output, but also found applications in engineering and smart devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Da Hye Yang, Francesco Ricci, Fredrik L. Nordstrom, Na Li
Summary: Through systematic evaluation of the oiling-out behavior of procaine, we identified both stable and metastable liquid-liquid phase separation, and established phase diagrams to assist in rational selection of crystallization strategies.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Vikki Anand Varma, Simmie Jaglan, Mohd Yasir Khan, Sujin B. Babu
Summary: Designing engineering structures like nanocages, shells, and containers through self-assembly of colloids is a challenging problem. This work proposes a simple model for the subunit, which leads to the formation of monodispersed spherical cages or containers. The model with only one control parameter can be used to design cages with the desired radius.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Hainan Jiang, Yaolong He, Xiaolin Li, Zhiyao Jin, Huijie Yu, Dawei Li
Summary: The cycling lifespan and coulombic efficiency of lithium-ion batteries are crucial for high C-rate applications. The Li-ion concentration plays a crucial role in determining the mechanical integrity and structural stability of electrodes. This study focuses on graphite as the working electrode and establishes an experimental system to investigate the mechanical properties of composite graphite electrode at different C-rates. Considering the effect of Li-ion concentration in stress analysis is found to be significant.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Zhiye Wang, Yunchuan Li, Mingjun Sun
Summary: This study investigates the influence of intramolecular pi-pi interactions on the electronic transport capabilities of molecules. By designing and analyzing three pi-conjugated molecules, the researchers observe that different pi-conjugated structures have varying effects on electron transport. The findings provide a theoretical foundation for designing single-molecule electronic devices with multiple electron channels based on intramolecular pi-pi interactions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Yuandong Xu, Haoyang Feng, Chaoyang Dong, Yuqing Yang, Meng Zhou, Yajun Wei, Hui Guo, Yaqing Wei, Jishan Su, Yingying Ben, Xia Zhang
Summary: Hollow MoS2 cubes and spheres were successfully synthesized using a one-step hydrothermal method with the hard template method. The hollow MoS2 cubes exhibited higher specific capacitance and energy density compared to the hollow MoS2 spheres. The symmetrical supercapacitors assembled with these hollow structures showed good performance and high capacity retention after multiple cycles. These findings suggest that controlling the pore structure and surface characteristics of MoS2 is crucial for enhancing its electrochemical properties.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Ainhoa Oliden-Sanchez, Rebeca Sola-Llano, Joaquin Perez-Pariente, Luis Gomez-Hortiguela, Virginia Martinez-Martinez
Summary: The combination of photoactive molecules and inorganic structures is important for the development of advanced materials in optics. In this study, bulky dyes were successfully encapsulated in a zeolitic framework, resulting in emission throughout the visible spectrum.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Miaomiao Zhang, Cunyuan Pei, Qiqi Xiang, Lintao Liu, Zhongxu Dai, Huijuan Ma, Shibing Ni
Summary: The design of a solid electrolyte interphase (SEI) plays a crucial role in improving the electrochemical performance of anode materials. In this study, lithium difluoro(oxalate)borate (LiDFOB) is used as an electrolyte additive to form a protective SEI film on Li3VO4 (LVO) anodes. The addition of LiDFOB results in a dense, uniform, stable, and LiF-richer SEI, which enhances the Li-ion storage kinetics. The generated SEI also prevents further decomposition of the electrolyte and maintains the morphology of LVO anodes during charge/discharge processes. This work demonstrates the effectiveness of LiDFOB as a multi-functional additive for LiPF6 electrolytes and provides insights into SEI construction for high-performance LVO anodes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
B. V. Andryushechkin, T. V. Pavlova, V. M. Shevlyuga
Summary: The atomic structure of the Ag(111)-p(4 x 4)-O phase was reexamined and two phases with the same periodicity were discovered. It was demonstrated that the accepted Ag6 model is incompatible with high-resolution oxygen-sensitive STM images.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
S. L. Romo-Avila, D. Marquez-Ruiz, R. A. Guirado-Lopez
Summary: In this study, we used density functional theory (DFT) calculations to investigate the interaction between model graphene oxide (GO) nanostructures and chlorine monoxide ClO. We aimed to understand the role of this highly oxidizing species in breaking C-C bonds and forming significant holes on GO sheets. Our results showed that C-C bonds in a single graphene oxide sheet can be broken through a simple mechanism involving the dissociation of two chemically attached ClO molecules. The formation of carbonyl groups and holes on the GO surface was also observed. This study provides important insights into the degradation of carbon nanotubes and the stability of GO during the myeloperoxidase (MPO) catalytic cycle.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Alberto Garcia-Fernandez, Birgit Kammlander, Stefania Riva, Hakan Rensmo, Ute B. Cappel
Summary: In this study, the X-ray stability of five different lead halide perovskite compositions (MAPbI3, MAPbCl3, MAPbBr3, FAPbBr3, CsPbBr3) was investigated using photoelectron spectroscopy. Different degradation mechanisms and resistance to X-ray were observed depending on the crystal composition. Overall, perovskite compositions based on the MA+ cation were found to be less stable than those based on FA+ or Cs+. Metallic lead formation was most easily observed in the chloride perovskite, followed by bromide, and very little in MAPbI3. Multiple degradation processes were identified for the bromide compositions, including ion migration, formation of volatile and solid products, as well as metallic lead. CsBr was formed as a solid degradation product on the surface of CsPbBr3.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Timofei Rostilov, Vadim Ziborov, Alexander Dolgoborodov, Mikhail Kuskov
Summary: The shock-loading behavior of nanomaterials is investigated in this study. It is found that shock compaction waves exhibit a distinct two-step structure, with the formation of faster precursor waves that travel ahead of the main compaction waves. The complexity of the shock Hugoniot curve of the tested nanomaterial is described, and the effect of initial porosity on the compressed states is demonstrated.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Sergey S. Nikitin, Alexander D. Koryakov, Elizaveta A. Antipinskaya, Alexey A. Markov, Mikhail V. Patrakeev
Summary: The stability of La1/3Sr2/3Fe1-xMnxO3-delta, a perovskite-type oxide, under reducing conditions is dependent on the manganese content. Increasing the manganese content leads to a decrease in stability. The behavior of iron and manganese in the oxide shows distinct differences, which can be attributed to the difference in the enthalpy of oxidation reactions. Additionally, the change in the La/Sr ratio affects the concentration of iron and manganese ions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Mosayeb Naseri, Shirin Amirian, Mehrdad Faraji, Mohammad Abdur Rashid, Maicon Pierre Lourenco, Venkataraman Thangadurai, D. R. Salahub
Summary: Inspired by the successful transfer of freestanding ultrathin films of SrTiO3 and BiFeO3, this study assessed the structural stability and investigated the electronic, optical, and thermoelectric properties of a group of two-dimensional perovskite-type materials called perovskenes. The findings revealed that these materials are wide bandgap semiconductors with potential application in UV shielding. Moreover, they exhibit better electrical and thermal conductivity at high temperatures, enabling efficient power generation in thermoelectric devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)