Article
Meteorology & Atmospheric Sciences
Dawei Hu, Dantong Liu, Shaofei Kong, Delong Zhao, Yangzhou Wu, Siyuan Li, Shuo Ding, Shurui Zheng, Yi Cheng, Kang Hu, Zhaoze Deng, Yunfei Wu, Ping Tian, Quan Liu, Mengyu Huang, Deping Ding
Summary: The droplet activation of ambient BC-containing particles is determined by coated size and modulated by the organic content of coatings. An activation diameter of 144 +/- 21 nm was observed for urban BC-containing particles (BCc) under SS = 0.2%, with a 60% +/- 10% number fraction of BCc being activated to cloud condensation nuclei (CCN). While K0hler theory CCN predictions accurately capture the total aerosol population, the CCN activation of BCc particles is overpredicted by 27%-71%.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Engineering, Environmental
Akash Gupta, Mukesh Kumar Thakur, Tirta Amerta Effendi, Ruei-San Chen, Hao-Yu Cheng, Kung-Hsuan Lin, Mohammed Bouras, Digvijay Singh Tomar, Hsin Yu Kuo, Surojit Chattopadhyay
Summary: In this study, electrostatically conjugated core-silica shell upconversion nanoparticles (UCNP@SiO2) and gold nanorod (AuNR) nanocomposites combined with graphene were used to demonstrate over 200-fold upconversion fluorescence enhancement. The enhanced fluorescence in UCNP, attributed to a plasmonic effect from AuNR and graphene, was supported by finite difference time domain simulations of electric field distribution. The performance of the hybrid photodetector (PD) with broad photoresponse and fast response times under various illumination conditions was also reported, with the potential application in remote sensing devices.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Geosciences, Multidisciplinary
Tao Huang, Yannian Zhu, Daniel Rosenfeld, Yuanjian Yang, David H. Y. Lam, W. H. Leung, Harry F. Lee, Jack C. H. Cheng, Steve H. L. Yim
Summary: The regime dependence of aerosol-cloud interaction has been explored through idealized cloud-resolving models and observations. The activation of cloud condensation nuclei (CCN) is limited by particle numbers in clean conditions, while updraft velocities play a crucial role in polluted regimes. Warm rain suppression is significantly enhanced over inland areas. These findings are supported by satellite retrievals and LiDAR observations.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
Monami Dutta, Abhinandan Ghosh, Sudhir Kumar Sharma, Tuhin Kumar Mandal, Abhijit Chatterjee
Summary: This study investigates the role of water soluble organic carbon (WSOC) in cloud condensation nuclei (CCN) activation under restricted anthropogenic emissions. The results show that during the COVID-19 lockdown period, while the aerosol particle concentration decreased, CCN concentration increased and the CCN activation ratio also increased. The study finds that WSOC solubility increased during the lockdown period and exhibited a stronger correlation with CCN. It suggests that under restricted fossil fuel emissions, the increased surface ozone favored the photochemical oxidation of biogenic VOCs emitted from coniferous forests, leading to the production of WSOC that actively participates in CCN activation.
ATMOSPHERIC RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Yue-Yi Wang, Song-Yang, Wen-Jin Sun, Kun Dai, Ding-Xiang Yan, Zhong-Ming Li
Summary: Barium ferrite (BaFe12O19) is a potential microwave absorption material, but the performance is limited by the poor dispersion of carbon nanotubes (CNTs) in the composites prepared by ball-milling method. In this study, CNTs were uniformly introduced into the precursor of BaFe12O19 during the auto-ignition process and calcined under different atmospheres. The resulting CNT/BaFe12O19 composites exhibited significantly improved microwave absorption performance compared to pure BaFe12O19 and CNT/BaFe12O19 composites prepared by ball-milling method.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Characterization & Testing
Jianjie Qin, Chengguo Wang, Yanxiang Wang, Shunsheng Su, Zhiqiang Yao, Ziming Ma, Quan Gao, Meijie Yu, Qifen Wang, Huazhen Wei
Summary: In this study, multi-walled carbon nanotubes (CNTs) were grown in-situ on the surface of carbon fibers (CFs) at low pressure using vertical chemical vapor deposition (CVD). The resulting hierarchical composite material based on epoxy resin showed significantly improved interlaminar shear strength (ILSS) and fracture behavior, attributed to the enhanced adhesion of fibers and resin, as well as the constrained molecular movement and strong anchoring interaction provided by the CNTs.
Review
Chemistry, Multidisciplinary
Yuanxing Fang, Yidong Hou, Xianzhi Fu, Xinchen Wang
Summary: This review focuses on the photocatalytic technologies and materials of polymeric photocatalysts for the oxygen evolution reaction (OER). Two practical systems, namely particle suspension and film-based photoelectrochemical systems, are discussed. The concept is reviewed in terms of thermodynamics and kinetics, and the key characteristics of polymeric photocatalysts, such as light absorption, charge separation and transfer, and surface oxidation reactions, are examined. Satisfactory OER performance by polymeric photocatalysts could lead to cost-effective, sustainable, and renewable water splitting and other advanced applications using solar energy.
Article
Geosciences, Multidisciplinary
Jiangchuan Tao, Ye Kuang, Biao Luo, Li Liu, Hanbin Xu, Nan Ma, Pengfei Liu, Biao Xue, Miaomiao Zhai, Wanyun Xu, Weiqi Xu, Yele Sun
Summary: The commercial continuous-flow streamwise thermal-gradient cloud condensation nuclei (CCN) counter is commonly used for measuring aerosol CCN activity. In this study, we found that droplet growth in the CCN counter is kinetically limited and CCN-active droplets do not reach their theoretical diameters under low supersaturations. Ignoring kinetic growth limitation in CCN identification may result in underestimation of CCN counting and the aerosol hygroscopicity parameter κ by up to 50% for supersaturations lower than 0.1%. We recommend the use of thresholds considering kinetic limitations as new criteria for CCN identification under low supersaturations.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Engineering, Chemical
Sumona Paul, Mitun Chandra Bhoumick, Sagar Roy, Somenath Mitra
Summary: In this study, a highly hydrophobic membrane was prepared by immobilizing carbon nanotubes on a PTFE microfiltration membrane for the dewatering of organic-water mixtures containing trace amounts of water. The membrane showed remarkable separation efficiency and enhanced hydrophobicity, resulting in coalescence and rejection of water droplets.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Yaqi Hou, Qianxiao Wang, Shuli Wang, Miao Wang, Xuemei Chen, Xu Hou
Summary: Carbon nanotube-based (CNT-based) interfacial evaporation material is a promising material for solar desalination. Molecular dynamic simulations were used to study the evaporation rate of CNT-based membranes with different hydrophilic and hydrophobic chemical modified surfaces. The hydrogen bonding density among water molecules at the interface was found to be a key factor in enhancing the evaporation rate. For hydrophilic CNT-based membranes, strong interactions between the outer surface of the membrane and water molecules can disrupt the water-water hydrogen bonding interactions at the interface, resulting in a reduction of the hydrogen bonding density and an enhancement effect in evaporation rate. There is also an optimal thickness for the evaporation membrane.
CHINESE CHEMICAL LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Shaeel Ahmed Althabaiti, Zaheer Khan, Maqsood Ahmad Malik, Salem Mohamed Bawaked, Soad Zahir Al-Sheheri, Mohamed Mokhtar, Sharf Ilahi Siddiqui, Katabathini Narasimharao
Summary: TiO2 nanotubes were deposited on activated carbon surface with varying weight percentage. The physicochemical properties of the synthesized TiO2NTs-AC nanocomposites were analyzed by various characterization techniques. The study found that increasing the content of activated carbon resulted in increased surface area and pore volume, and decreased energy bandgap. The TiO2NTs-AC nanocomposite with 40% activated carbon showed efficient photocatalytic hydrogen production under sunlight.
NANOSCALE ADVANCES
(2023)
Article
Multidisciplinary Sciences
Daniel Popa, Richard Hopper, Syed Zeeshan Ali, Matthew Thomas Cole, Ye Fan, Vlad-Petru Veigang-Radulescu, Rohit Chikkaraddy, Jayakrupakar Nallala, Yuxin Xing, Jack Alexander-Webber, Stephan Hofmann, Andrea De Luca, Julian William Gardner, Florin Udrea
Summary: The gas sensor market is rapidly growing due to various socioeconomic and industrial factors, with a particular demand for high-performance MIR gas sensors in healthcare, smart homes, and the automotive sector. Researchers have developed an on-chip broadband thermal MIR source based on CMOS technology and a CNT blackbody layer, offering an ideal solution for low-cost, highly-integrated MIR spectroscopy.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Chemical
Sumona Paul, Sagar Roy, Somenath Mitra
Summary: This study developed a carbon nanotube immobilized membrane for microfiltration dewatering of butanol. The carbon nanotubes enhanced the membrane hydrophobicity and butanol permeation, resulting in high preconcentration levels. The water-butanol mixtures exhibited different separation efficiencies in different concentration zones.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Nanoscience & Nanotechnology
Shuning Xiao, Ningyu Zhang, Ying Tao, Xueling Song, Guisheng Li, Hexing Li, Dieqing Zhang
Summary: In this study, a series of carbon nanotube (CNT)-threaded CeO2 mesocrystalline photocatalysts were synthesized using the microwave thermal method. The noncontinuous CNT-threaded structure provided two interfacial charge transport pathways for efficient separation of photogenerated carriers. The introduction of CNTs induced surface Ce3+ and oxygen vacancies in mesocrystalline CeO2, enhancing adsorption and activation of reactants and facilitating a deep oxidation pathway for NO removal. The optimal photocatalyst exhibited remarkable conversion ratio for NO oxidation and NO3- selectivity in a recyclable way.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Wonkyeong Son, Sungwoo Chun, Jae Myeong Lee, Gichan Jeon, Hyeon Jun Sim, Hyeon Woo Kim, Sung Beom Cho, Dongyun Lee, Junyoung Park, Joonhyeon Jeon, Dongseok Suh, Changsoon Choi
Summary: In this study, a twist-stable and hydrophilic coiled carbon nanotube (CNT) yarn was prepared by the easy electrochemical oxidation (ECO) method. The resulting yarns showed increased density and capacitance, and were fabricated into stretchable supercapacitors.
Article
Optics
Jonathan P. Phillips, Saumyabrata Banerjee, Klaus Ertel, Paul Mason, Jodie Smith, Thomas Butcher, Mariastefania De Vido, Chris Edwards, Cristina Hernandez-Gomez, John Collier
Article
Optics
Mariastefania De Vido, Paul D. Mason, Michael Fitton, Rupert W. Eardley, Gary Quinn, Danielle Clarke, Klaus Ertel, Thomas J. Butcher, P. Jonathan Phillips, Saumyabrata Banerjee, Jodie Smith, Jacob Spear, Chris Edwards, John L. Collier
Summary: This paper presents a model to predict thermal stress-induced birefringence in high repetition rate diode-pumped Yb:YAG lasers, which agrees well with experimental observations. Single-pass depolarisation strongly depends on input polarisation state and pumping parameters.
Correction
Chemistry, Multidisciplinary
Kumud Malika Tripathi, Anshu Bhati, Anupriya Singh, Amit Kumar Sonker, Sabyasachi Sarkar, Sumit Kumar Sonkar
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Optics
Jonathan P. Phillips, Saumyabrata Banerjee, Paul Mason, Jodie Smith, Jacob Spear, Mariastefania De Vido, Klaus Ertel, Thomas Butcher, Gary Quinn, Danielle Clarke, Chris Edwards, Cristina Hernandez-Gomez, John Collier
Summary: We have successfully demonstrated the second and third harmonic conversion of a high pulse energy, high average power 1030 nm laser, achieving efficient frequency conversion to green and UV-A wavelengths. These results represent the highest energy and power reported for frequency conversion to these wavelengths to date.
Article
Materials Science, Multidisciplinary
Kiyoshi Kato, Saumyabrata Banerjee, Nobuhiro Umemura
Summary: The experimental results demonstrate the phase-matching properties of AgGa0.86In0.14S2 for various laser sources, and provide Sellmeier equations and the nonlinear optical constant for further study.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Optics
Martin Divoky, Jan Pilar, Martin Hanus, Petr Navratil, Ondrej Denk, Patricie Severova, Paul Mason, Thomas Butcher, Saumyabrata Banerjee, Mariastefania De Vido, Chris Edwards, John Collier, Martin Smrz, Tomas Mocek
Summary: In this report, we achieved an output energy of 146 J in 10 ns long pulses at 10 Hz repetition rate from the Bivoj laser system. This represents a 40% increase in energy and power compared to previous publications and the most powerful multi-Joule high power laser system. (C) 2021 Optica Publishing Group.
Article
Health Care Sciences & Services
K. C. Santosh, Nijalingappa Pradeep, Vikas Goel, Raju Ranjan, Ekta Pandey, Piyush Kumar Shukla, Stephen Jeswinde Nuagah
Summary: The use of digital medical images for gender and age determination is valuable in forensic field for predicting results quickly and accurately. Digital dental X-ray images can provide reliable information for gender and age analysis.
JOURNAL OF HEALTHCARE ENGINEERING
(2022)
Article
Optics
Saumyabrata Banerjee, Jacob Spear, Patrick J. Dalton
Summary: The study reports on laser shock peening of tungsten, demonstrating increased compressive stresses in one direction with circular polarised light in hard materials like tungsten, but not in soft materials like aluminium.
Article
Optics
Saumyabrata Banerjee, Jacob Spear
Summary: In this paper, the authors demonstrate the introduction of compressive stresses in pure tungsten and its alloy TAM7525 through nanosecond laser shock peening (ns-LSP) without the need for absorption and confinement layers. The peak compressive stresses achieved in pure tungsten and TAM7525 without confinement layer compare favorably to the results obtained with water as a confinement layer in traditional ns-LSP. The depth of compressive stresses recorded in tungsten and its alloy through confinement layer free ns-LSP is significantly greater than that achieved in aluminum through femtosecond laser shock peening (fs-LSP) at atmospheric pressure.
Article
Optics
Paul Mason, Hugh Barrett, Saumyabrata Banerjee, Thomas Butcher, John Collier
Summary: A new approach to generate high-energy green pulses has been presented, which involves placing a high-energy multi-slab Yb:YAG DPSSL amplifier and SHG crystal inside a regenerative cavity. In a proof-of-concept test, stable generation of six green pulses with a total energy of 2.0 J has been demonstrated. The efficient generation of high-energy green pulses offers a promising pump source for Ti:Sa amplifiers.
Article
Chemistry, Inorganic & Nuclear
Navendu Paul, Rudra Sarkar, Sabyasachi Sarkar
Summary: Oxo-molybdenum (dithiolene) complexes covalently linked to iron and zinc porphyrin have been synthesized to investigate electron transfer between the two metal centres in relevance to the catalytic cycle of native sulfite oxidase.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Jagannath Bhuyan, Bholanath Pakhira, Ameerunisha Begum, Sabyasachi Sarkar, Kumud Malika Tripathi
Summary: Structural control at the nanoscale is essential for the fabrication of functional nanostructures. In this study, the self-assembly of dithiolene complexes was manipulated by varying the concentration. The positional terminal sulfide ligand variation was found to affect the self-assembly process, resulting in different shapes in the nanodomain. This research provides opportunities for engineering desired nanostructures with complex architectures.
REACTION CHEMISTRY & ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Ankit Samanta, Subrata Ghosh, Sabyasachi Sarkar
Summary: Carbon nano onion (CNO) synthesized from dried grass through carbonization can convert aerial oxygen into reactive oxygen species (ROS) under visible light, and even generate hydrogen peroxide under room light to inhibit H1N1 influenza virus. The continuous conversion of air to ROS by CNO allows it to sterilize infected hospitals, aircraft carriers, and air conditioner vents, thereby preventing frequent evacuations caused by other RNA viruses and hospital pathogens during the COVID-19 pandemic.
JOURNAL OF CHEMICAL SCIENCES
(2022)
Article
Materials Science, Composites
Dipak Gorakh Babar, Nidhi Rani Gupta, Goutam Nandi, Sabyasachi Sarkar
JOURNAL OF COMPOSITES SCIENCE
(2020)
Article
Optics
Saumyabrata Banerjee, Paul Mason, Jonathan Phillips, Jodie Smith, Thomas Butcher, Jacob Spear, Mariastefania De Vido, Gary Quinn, Danielle Clarke, Klaus Ertel, Cristina Hernandez-Gomez, Chris Edwards, John Collier
HIGH POWER LASER SCIENCE AND ENGINEERING
(2020)