Article
Chemistry, Physical
Dan Jin, Zhen Li, Zhenghua Wang
Summary: Hierarchical NiCo2O4 and NiCo2S4 nanomaterials were successfully prepared through hydrothermal and calcination processes in this study. The morphology evolution mechanism was investigated, showing that NiCo2S4 has higher electrocatalytic activity and stability than NiCo2O4, making it a promising non noble metal electrocatalyst for direct methanol fuel cells.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Puja Saikia, Debasish Borah, Rupam Debnath, Debika Gogoi, Ankita Das, Jayashree Rout, Narendra Nath Ghosh, Piyush Pandey, Chira R. Bhattacharjee
Summary: A facile green synthesis method was used to prepare Ag doped MnO2 binary nanohybrid and Ag doped MnO2 incorporated reduced graphene oxide (rGO) hierarchical nanohybrid, using an aqueous extract of lichen Acroscyphus sphaerophoroides. The nanohybrids showed excellent catalytic and antibacterial activities, and the presence of reactive oxygen species played a critical role in the photocatalytic degradation process.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Physical
Shuangshuang Li, Huiqing Fan, Yuying Yang, Yanlei Bi, Guangwu Wen, Lu-Chang Qin
Summary: In this study, a efficient and simple method was proposed to directly grow self-supporting hierarchical porous cactus-like ZnCo2O4 material on Ni foam using a hydrothermal method with post-calcination treatment. The prepared cactus-like ZnCo2O4 film electrode exhibited excellent electrochemical performance and demonstrated promising potential for energy storage application.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Gholamreza Ahmadpour, Mohammad Reza Nilforoushan, Behrooz Shayegh Boroujeny, Morteza Tayebi, Seyed Mohammad Jesmani
Summary: ZnO nanostructures were coated on glass substrate surfaces via hydrothermal process, with doping of Al+3 ions to investigate microstructural variation. XRD and SEM analyses confirmed formation of different morphologies and crystal sizes, including nanoflower, nanorod, and nanopanel structures. Results showed that etching with fused NaOH produced a uniform and compacted structure, indicating successful formation of uniform ZnO film without seed layer deposition.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Norah Alwadai, Sumaira Manzoor, Maryam Al Huwayz, Muhammad Abdullah, Rabia Yasmin Khosa, Salma Aman, Abdul Ghafoor Abid, Z. A. Alrowaili, M. S. Al-Buriahi, Hafiz Muhammad Tahir Farid
Summary: One of the main areas of current research in electrochemical water oxidation mechanism for clean energy production is the development of a cost-effective, efficient, and durable electrocatalyst. Metal oxides based on MnO2 have proven to be advantageous for the oxygen evolution reaction (OER) in a basic electrolyte due to their strong electrical characteristics and synergistic effects. In this study, a SnO2/MnO2 nanocomposite was synthesized using a hydrothermal approach and applied to the OER process using Cu foam as a conductive substrate. The nanocomposite exhibited a Tafel slope mechanism of 38.9 mV dec(-1) and a low overpotential (eta) of 360 mV @ 10 mA cm(-2) for OER in alkaline atmosphere. This study validates the value of nanocrystalline catalysts with controlled hierarchical designs for enhancing OER activity.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Applied
Yun Yang, Dan Zhou, Huaxin Zhang, Binyi Yin, Qingrui Liu, Xinhuan Lu, Shuijin Yang, Qinghua Xia
Summary: In this study, highly exposed Lewis acidity on hierarchical Zr-HSZ zeolite was successfully constructed by one-step rotating hydrothermal synthesis with the assistance of K+, resulting in distinct weak acid properties and purely Lewis acid sites. The unique hollownest morphology of HSZ material with hierarchically porous structure does not hinder the mass transfer and diffusion of substrate molecules.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Physical
Ekaterina A. Arkhipova, Anton S. Ivanov, Konstantin Maslakov, Roman Yu Novotortsev, Serguei Savilov, Hui Xia, Andrey Desyatov, Sergey M. Aldoshin
Summary: In this study, the electrochemical performances of hydrothermally treated α-MnO2 and δ-MnO2 were compared. The results showed that δ-MnO2 had a higher specific capacitance than α-MnO2, attributed to its layered structure and pseudocapacitance behavior. Additionally, δ-MnO2 exhibited high electrochemical stability, making it a suitable electrode material for pseudocapacitors.
Article
Chemistry, Physical
Junling Wang, Xiaoxi Zheng, Yu Zhu, Zhirong Wang, Haobo Zhou, Shui Yu
Summary: A covalently functionalized hierarchical MnO2@LDH nanostructure (FA-MnO2@LDH) is designed to alleviate the high fire hazard problem of epoxy resin. The incorporation of 2.0 wt% FA-MnO2@LDH significantly reduces heat, smoke, and CO emissions, while improving the mechanical property. This investigation provides insights for fabricating fire-safe and mechanic robust polymer composites using hierarchically tailored nanostructure.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Huifang Pang, Rakesh P. Sahu, Jia Liu, Yuanyuan Fu, Lingxi Huang, Yuping Duan, Ishwar K. Puri
Summary: By assembling magnetic and dielectric materials around carbon nanotubes, materials with high microwave absorbing properties can be achieved. The hierarchical multi-layered structure increases interface area and rearranges magnetic particles, leading to enhanced microwave absorption performance.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Allef Leite dos Santos, Jeferson Almeida Dias, Gelson Tiago dos Santos Tavares, Vagner Romito de Mendonca, Tania Regina Giraldi
Summary: This study investigated the synthesis and application of niobium pentoxide for adsorption of methylene blue in aqueous medium. Hydrothermal treatment affected surface hydroxylation while synthesis time did not significantly affect nanoparticle morphology. MB adsorption studies showed optimal performance at pH 6.0, following pseudo-second order kinetics and fitting the Freundlich isotherm model. Thermal analyses confirmed a phase transition at 600 degrees C after calcination at 500 and 700 degrees C. The obtained materials demonstrated high surface area, adsorption capacity, suspension stability, and thermal stability.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Energy & Fuels
Jintao Lu, Qian Zhang, Qing An, Tong Bu, Liu Hong, Yuheng Feng, Dezhen Chen
Summary: By using a novel activation method, hierarchical porous carbon can be produced from high-ash sewage sludge char, which demonstrates excellent electrochemical performance. HF washing for ash removal and KHCO3 for mesopores extension are crucial steps.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Environmental Sciences
Qian Zhang, Jiebin Wang, Yude Zhang, Juntao Chen
Summary: In this study, hierarchical porous kaolinite microsphere (HPKS) with three-dimensional structure was successfully fabricated as an efficient and environmentally friendly adsorbent for wastewater remediation. The synthesized HPKS exhibited excellent adsorption capacity for methylene blue (MB) and high selectivity for cationic MB dyes. The adsorption kinetic experiment results fit well with the pseudo-second-order model, indicating a fast adsorption rate. The sorption isotherm study revealed the chemisorption of electrostatic attraction between the cationic MB molecules and the negative charged surfaces of HPKS. Furthermore, HPKS showed high stability and recyclability through calcination without obvious diminishment of adsorption capacity.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Yilin Dong, Jing Sun, Yafang Shen, Ziliang Wang, Wenlong Wang, Zhanlong Song, Xiqiang Zhao, Yanpeng Mao
Summary: A novel rGO@a-MnO2 catalyst, prepared by doping 3D snowflake graphene into a-MnO2, is able to enhance the catalytic activity at low temperature. The catalysts exhibit larger specific surface area and pore volume compared to a-MnO2, facilitating sufficient contact reaction between active component and VOCs. The presence of a unique graphene electronic bridge promotes electron transfer, leading to increased surface defects and more surface adsorbed oxygen. The catalyst doped with 4% 3D snowflake graphene shows the best activity, achieving 90% toluene conversion at 155°C and even 100% toluene conversion with 80% CO2 selectivity at 200°C.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Chao Gai, Hongxia Jia, Zhengang Liu, Lei Luo, Dong Li
Summary: In this study, a series of hydrothermal carbon-supported nickel catalysts with an Ageratum conyzoides L.-like superstructure were fabricated. These hierarchical structured composites exhibited promising low-temperature tar reforming activity and long-term durability, making them potential candidates for catalytic applications.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Applied
Li Han, Lulu Guo, Shaozong Xue, Zheng Wang, Tianliang Lu, Jun Xu, Yuzhong Zhan, Jianfeng Wang
Summary: In this study, hierarchical porous SAPO-34 zeolite with excellent catalytic properties was successfully prepared using a one-step hydrothermal synthesis method by introducing water-soluble polyacrylamide (PAM) hydrogel into the conventional SAPO-34 synthesis system. Compared to conventional microporous SAPO-34, the hierarchically structured SAPO-34 exhibited significantly longer catalytic lifetime (740 min) and improved selectivity for light olefins up to 87.5% in the MTO reaction.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Engineering, Environmental
Jun-Seo Lee, Kihyun Shin, Seo-Young Jun, Suji Kim, Won-Hee Ryu
Summary: In order to address the limitations of lithium-ion batteries, Li metal-O2 breathing batteries (LMOBs) have been extensively studied due to the high energy density provided by the O2 cathode and Li metal anode. However, the growth of dendrites and resultant surface degradation on the Li metal anode hinder safe and long-term battery operation. This study introduces vinylpyrrolidone (VP) into LMOB electrolyte to flatten the Li metal anode, eliminate dendrite growth, and activate a cathodic reaction with reduced overpotential.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Dongkyu Choi, Hyuksang Kwon, Seonguk Lim, Taekyun Jeong, Heechul Jung, Yong-Il Kim, Dongwook Han
Summary: This study explores the potential of Mn-rich orthorhombic LiMn1-xTixO2 as a Co- and Ni-free cathode material for Li-ion rechargeable batteries. It addresses the shortcomings of traditional o-LiMnO2, such as oxygen deficiency, cation mixing, and phase transition during cycling, by introducing Ti-doped o-LiMnO2 and c-LiTiO2 as the primary and secondary phases, respectively.
Article
Chemistry, Multidisciplinary
You Jin Kim, So Yeon Ko, Suji Kim, Kyung Min Choi, Won-Hee Ryu
Summary: This study proposes a method to fabricate dual functional coating materials using metal-organic polyhedra (MOP) for stabilizing the surface of lithium-ion battery cathodes and facilitating ion diffusion. The results show that the MOPAC-coated Ni-rich layered cathode exhibits better cycle retention and enhanced kinetic properties compared to the pristine and MOP-coated cathodes.
Article
Engineering, Biomedical
Ganchimeg Davaa, Jin Young Hong, Jung-Hwan Lee, Min Soo Kim, Jennifer O. Buitrago, Yu-Meng Li, Hae-Hyoung Lee, Dong Wook Han, Kam W. Leong, Jung Keun Hyun, Hae-Won Kim
Summary: Neural stem cells (NSC) have the potential to regenerate injured neural tissues, but suffer from low survival and uncontrolled differentiation. This study demonstrates that mechanically-tuned protein hydrogels can protect and enhance the long-term survival of reprogrammed NSC, alleviate neural inflammation, promote differentiation, and improve locomotor functions in treating injured spinal cord.
ADVANCED HEALTHCARE MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Seon Yeong Chae, Sangheon Jeon, Dong-Wook Han, Suck Won Hong
Summary: Researchers have investigated the excellent antibacterial activity of graphene-based materials, which utilize the unique mechanical, electrical, and surface properties of graphene, to address the challenges of bacterial drug resistance and emerging infectious diseases. The antibacterial mechanism involves physical damage and chemical interactions between graphene and bacterial membranes. A simple manufacturing process was also developed to create three-dimensionally arranged graphene oxide films, which exhibited antibacterial activity.
ENVIRONMENTAL SCIENCE-NANO
(2023)
Review
Biochemistry & Molecular Biology
Moon Sung Kang, Jinju Jang, Hyo Jung Jo, Won-Hyeon Kim, Bongju Kim, Heoung-Jae Chun, Dohyung Lim, Dong-Wook Han
Summary: This review focuses on the advances and innovations of 3D bioprinted skin for skin regeneration. By improving materials, structures, and functions, the clinical potential of 3D bioprinted skin has been enhanced. With state-of-the-art printing technology and novel biomaterials, highly developed skin comprising stratified epidermis, dermis, and hypodermis with blood vessels, nerves, muscles, and skin appendages can be fabricated. We hope that this review will guide future research and clinical applications.
Review
Biochemistry & Molecular Biology
Moon Sung Kang, Tae Eon Park, Hyo Jung Jo, Min Seok Kang, Su Bin Lee, Suck Won Hong, Ki Su Kim, Dong-Wook Han
Summary: This article introduces that macromolecules are composed of smaller subunits and have significant roles in living organisms. Recent studies have shown that biologically active macromolecules can help regenerate hair, providing a potential solution for hair loss therapies. The article examines the latest developments in the use of macromolecules for hair loss treatment, including the principles of hair follicle morphogenesis, hair shaft development, hair cycle regulation, and alopecia. It also discusses innovative treatments such as microneedle and nanoparticle delivery systems and the application of macromolecule-based tissue-engineered scaffolds for hair follicle regeneration. Additionally, the article explores the use of artificial skin platforms as a promising screening method for hair loss treatment drugs. These multifaceted approaches identify promising aspects of macromolecules for future hair loss treatments.
MACROMOLECULAR BIOSCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Indong Jun, Hyunki Cho, Sebastian E. Amos, Youngjun Choi, Yu Suk Choi, Chang Seon Ryu, Sang-Ah Lee, Dong-Wook Han, Hyung-Seop Han, Ji Hun Yang, Hyun-Woo Jeong, Honghyun Park, Young Jun Kim
Summary: The disruption of thyroid hormones due to chemical exposure is a significant societal problem. Recent breakthroughs in biotechnology have allowed for the evaluation of potential toxicity of chemicals using 3D cell cultures. This study focuses on the interactive effects of thyroid-friendly soft (TS) microspheres on thyroid cell aggregates and evaluates their potential as a reliable toxicity assessment tool.
Article
Polymer Science
Soloman Agnes Mary, Naisini Ariram, Arun Gopinath, Senthil Kumar Chinnaiyan, Iruthayapandi Selestin Raja, Bindia Sahu, Venkateshwarapuram Rengaswami Giri Dev, Dong-Wook Han, Balaraman Madhan
Summary: In this study, a fibrous mat incorporating the bioactive extract of Cassia auriculata (CA) with polycaprolactone (PCL) was developed using the centrifugal spinning technique. The concentration of PCL and the spinning speed were optimized to achieve better fiber formation. The developed fibrous mat showed fine pores and high biocompatibility for cell proliferation.
Article
Chemistry, Multidisciplinary
Seo-Young Jun, Kihyun Shin, Jun-Seo Lee, Suji Kim, Jinyoung Chun, Won-Hee Ryu
Summary: To achieve exceptional performance, research has turned away from the unstable Li-metal anode chemistry and focused on pushing the boundaries of existing battery technology. This study presents a surface-flattening and interface stabilizing agent using methyl pyrrolidone (MP) for cyclable Li-metal batteries. The experiment demonstrates the excellent stability of the Li-metal electrode over 600 cycles at a high current density of 5 mA cm(-2) using an optimal concentration of the MP additive. The use of molecular dipole agents has the potential to stabilize Li-metal anodes and advance next-generation energy storage devices.
Article
Cell Biology
Moon Sung Kang, Rowoon Park, Hyo Jung Jo, Yong Cheol Shin, Chang-Seok Kim, Suong-Hyu Hyon, Suck Won Hong, Junghwan Oh, Dong-Wook Han
Summary: In recent years, bone tissue engineering has made significant progress in promoting the direct and functional connection between bone and graft to facilitate the healing of damaged bone tissues. This study introduces a new method for synthesizing reduced graphene oxide (rGO) and hydroxyapatite (HAp) using environmentally friendly materials. The synthesized E-rGO/HAp composites showed exceptional properties for use as bone tissue engineering scaffolds and promoted the proliferation and osteogenic differentiation of human mesenchymal stem cells. These composites have the potential to be used as BTE scaffolds, stem-cell differentiation stimulators, and implantable device components due to their biocompatible and bioactive properties.
Article
Biochemistry & Molecular Biology
Gyeonghyeon Kim, Dong-Wook Han, Jong Hun Lee
Summary: In this study, baicalein was found to have antioxidant effects and could protect HaCaT keratinocytes from H2O2-induced oxidative stress by maintaining mitochondrial homeostasis and cellular tight junctions.
Article
Multidisciplinary Sciences
Seok Hyun Lee, Moon Sung Kang, Sangheon Jeon, Hyo Jung Jo, Suck Won Hong, Bongju Kim, Dong-Wook Han
Summary: Contemporary advances in 3D bioprinting have allowed for the creation of personalized live 3D tissue mimetics. The development of bioink materials that accurately replicate the composition of native extracellular matrix and mimic cell properties has been emphasized. In this study, MXene-incorporated GelMA/HAMA bioinks were prepared to investigate their potential for spontaneous osteodifferentiation of human mesenchymal stem cells (hMSCs) when used for 3D printing. The GelMA/HAMA-MXene hydrogels were found to provide favorable matrices for hMSCs growth and survival, and hMSCs were shown to differentiate into osteoblasts in the GelMA-HAMA/MXene composites, creating a favorable microenvironment for bone regeneration. These findings suggest that MXene-incorporated GelMA/HAMA bioink has significant biofunctional advantages for the development of effective scaffolds in bone tissue regeneration.
Article
Engineering, Biomedical
Jaeheung Kim, Moon Sung Kang, Seung Won Jun, Hyo Jung Jo, Dong-Wook Han, Chang-Seok Kim
Summary: This study investigates the use of multifunctional nanodiamonds as promoters of neuritogenesis and probes for super-resolution imaging. It is found that nanodiamonds can promote neuronal growth and penetrate the blood-brain barrier for super-resolution imaging. These findings highlight the significant potential of nanodiamonds in neural regeneration and neuroscience research.
BIOMATERIALS RESEARCH
(2023)
Article
Chemistry, Physical
Yoo Jung Choi, You Jin Kim, Suji Kim, Ga Yoon Kim, Won-Hee Ryu
Summary: Layered cathode materials, such as LiCoO2, have been synthesized for Li-ion batteries using a direct solution-calcination strategy. The addition of polyvinylpyrrolidone (PVP) as a functional agent in the synthesis process helps to eliminate surface Li residues and promote a uniform particle distribution. The solution-calcined cathode material shows improved cycling stability and rate capability compared to commercial LCO, with suppressed phase transition. This research provides a simple and versatile method for the synthesis of cathode materials, avoiding complicated steps and the formation of unwanted residual lithium compounds.
APPLIED SURFACE SCIENCE
(2023)
