Article
Nanoscience & Nanotechnology
Xiaodan Chen, Seyed Naveed Hosseini, Marijn A. van Huis
Summary: In this study, the transformation of anatase TiO2 nanorods into rock-salt TiO nanoparticles at high temperature was investigated. An intermediate stage during the transformation was identified between 950-1200 degrees C. Understanding the phase and morphology evolution at high temperatures is essential for the functionality of nanocrystals in various applications.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jiaqi Chen, Jian Gao, Xiaoyang Liu, Pan Wang, Xue Yu, Feng Zhao, Yan Sun, Wei Feng, Qingyuan Wang
Summary: Degradation of organic pollutants, especially organic dyes and antibiotics, by semiconductor photocatalysts is an efficient strategy for wastewater treatment. TiO2 nanomaterials are considered promising due to their stability and availability. This research used oxalic acid to control the hydrolysis process of tetrabutyl titanate, leading to controllable crystalline phase transformation and reduced crystalline size of TiO2. The photocatalytic degradation performances were enhanced with increased ratio of oxalic acid to tetrabutyl titanate, attributed to improved dispersibility, increased specific surface area, reduced recombination rates of charge carriers, and decreased energy bands.
Article
Chemistry, Physical
Yug Joshi, Robert Lawitzki, Guido Schmitz
Summary: This study investigates the kinetics of lithium transport using an innovative technique and reveals that the end phases have poor diffusivity, but are accelerated at intermediate lithium concentrations. The slow migration of the phase boundary hinders the formation of the Li-rich phase in the initial stages, contrasting with prior theoretical studies.
Article
Chemistry, Multidisciplinary
Zeineb A. Thiehmed, Talal M. Altahtamouni
Summary: In this study, the effect of KBr salt on the growth of TiO2 nanorods was investigated. The addition of KBr with different concentrations controlled the growth of TiO2 nanorods, with KBr molecules suppressing lateral growth and allowing for axial growth. This impacted the morphology and internal surface area of the nanorods.
Article
Materials Science, Multidisciplinary
J. A. Bittner, J. S. Popovics
Summary: This article introduces a mechanistic model for slow dynamic response, known as the Mechanistic Diffusion Model (MDM), which explains the complex dynamic behaviors of infrastructure materials through the coupling of mechanical and diffusional processes. The MDM provides a physical foundation to explain the environment and strain activated phenomena observed in previous slow dynamic experiments.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Chemistry, Applied
Florian Jonas, Benedicte Lebeau, Laure Michelin, Cedric Carteret, Ludovic Josien, Loic Vidal, Severinne Rigolet, Pierrick Gaudin, Jean-Luc Blin
Summary: The study investigates the effect of introducing heteroelements (Si, P, Al, Ge, Ga, and Zr) on the thermal stability of mesostructured titania prepared by the soft templating pathway. Results show that the addition of heteroelements delays the crystallization of amorphous titania into anatase, leading to a higher transition temperature and limited growth of anatase crystallites. Among the heteroelements considered, Si4+ and PO43- have the most beneficial effect on delaying the collapse of the mesostructure at higher temperatures.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Physical
Qianqian Shen, Baobao Jin, Jinlong Li, Zhe Sun, Wenxiang Kang, Huimin Li, Husheng Jia, Qi Li, Jinbo Xue
Summary: Developing technologies for high-yield photocatalytic hydrogen production reactions faces significant challenges due to low utilization of light, rapid recombination of photogenerated electron-hole pairs, and a limited number of active sites. In this study, researchers designed and fabricated a three-dimensional TiO2 rutile/anatase array photocatalytic material using an in situ dissolution-recrystallisation approach. The unique nanoarray structure and in situ fabrication of the AE-TiO2 homojunction improved light harvesting efficiency, charge transport separation efficiency, and surface active sites, leading to enhanced photocatalytic hydrolysis performance.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Chemistry, Physical
Gaurav Shukla, S. Angappane
Summary: The study demonstrates the successful growth of high temperature stable anatase phase TiO2 nanostructures using the glancing angle deposition technique. The annealed TiO2 nanorods exhibit unique wetting properties, with the structural contribution playing a key role in contact angle and increasing hydrophobicity over time.
APPLIED SURFACE SCIENCE
(2022)
Article
Environmental Sciences
Pooja P. Sarngan, Agasthiyaraj Lakshmanan, Debabrata Sarkar
Summary: Designing one-dimensional mixed-phase TiO2 with defects near the valence band, experimental results revealed that band alignment between two phases, up-shift of band edge, and optimum anatase percentage play a crucial role in enhancing photocatalytic activity. We predicted shifts in band edge induced by surface electric dipole layer from defects.
Article
Materials Science, Multidisciplinary
Md. Ashraful Alam, Raton Kumar Bishwas, Sabrina Mostofa, Shirin Akter Jahan
Summary: The main objective of this study is to convert TTIP to ultrapure high crystalline single crystal anatase-TiO2 at low temperature (45 degrees C), and the purity of the nano single-crystal anatase-TiO2 observed is 100%. The lattice parameters, lattice volume, crystal strain and crystallite size are confirmed by X-ray diffraction analysis, and further confirmed by selected area electron diffraction and nano beam diffraction.
Article
Materials Science, Multidisciplinary
Zhonghao Ji, Jiang Wu, Tao Jia, Cheng Peng, Yixuan Xiao, Zhiqiang Liu, Qizhen Liu, Yuhang Fan, Jiajie Han, Liangsheng Hao
Summary: In this study, titanium dioxide phase junction nanorods with Ti3+ and oxygen vacancies were successfully prepared and utilized for photocatalytic removal of gas phase mercury, showing significantly enhanced efficiency compared to commercial P25. The synergy between phase junction, Ti3+, and O-v in promoting electron-hole separation and transfer efficiency was demonstrated, providing new insights into effective solar energy utilization and photocatalyst design.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Chemistry, Multidisciplinary
Lu Zhang, Xian Luo, Jian-Dong Zhang, Yong-Fu Long, Xin Xue, Ben-Jun Xu
Summary: In this study, Fe-doped TiO2 precursors were prepared and analyzed to investigate the effects of Fe doping on the phase transition of TiO2. Results showed that Fe increased the phase transition temperature from anatase to rutile and accelerated the transformation process. Additionally, the crystal phase transition kinetics of Fe-doped TiO2 was found to follow the JMAK model and was influenced by crystal defects.
Article
Physics, Applied
Jiaming Wang, Kaiwei Liu, Boyang Zhang, Yaru Qiu, Yao Xiang, Wenrui Lin, Bo Yang, Bin Li, Guijun Ma
Summary: In this study, Rh was doped into rutile and anatase TiO2 crystal structures through an immersion-calcination process. The photocatalytic hydrogen evolution activity of Rh-doped rutile was found to be significantly higher under visible light irradiation compared to Rh-doped anatase. These results demonstrate the influence of crystal phase on atom doping and subsequent photocatalytic activities.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Inorganic & Nuclear
Seul Ah Kim, Sk. Khaja Hussain, Muhammad A. Abbas, Jin Ho Bang
Summary: In this study, the stability of TiO2 polymorphs was controlled by particle size and doping level. A solid-state high-temperature treatment was used to transform rutile TiO2 to anatase phase, resulting in a mixture of anatase and rutile phases, with anatase being the major phase.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Alessio Zandona, Emmanuel Veron, Gundula Helsch, Aurelien Canizares, Joachim Deubener, Mathieu Allix, Cecile Genevois
Summary: This study provides new insights into the crystallization mechanism of gel-derived SiO2-TiO2 glasses, with the first direct observation of subcritical nuclei by in situ high-temperature TEM. It confirms the crucial role of medium-range compositional fluctuations and Ostwald's rule of stages in crystal nucleation in undercooled melts and glasses.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Green & Sustainable Science & Technology
Hyun Chan Kim, Lindong Zhai, Pooja S. Panicker, Hyun Jung Kim, David MacDonnell, Jaehwan Kim
Summary: This study introduced a new concept of membrane photon sieve (PS) based on cellulose nanofiber (CNF), which is transparent, flexible, lightweight, and has high strength. The PS fabrication on a CNF film using micro-nano structure molding technique was highlighted, showing structural stability in external environmental changes. Through high vacuum environment testing, CNF was proven to be a promising optical material with the prepared CNF-PS exhibiting high beam quality, showing potential for broad applications in thin and compact photonic devices.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2022)
Article
Materials Science, Paper & Wood
Pooja S. Panicker, Hyun Chan Kim, Dickens O. Agumba, Ruth M. Muthoka, Jaehwan Kim
Summary: In this study, nanocellulose long fibers (NCLFs) were continuously fabricated under an alternating current (AC) electric field, leading to improved mechanical properties. With increasing applied AC voltage, the NCLFs exhibited significant enhancements in Young's modulus, tensile strength, and toughness. The proposed method shows promise for fabricating strong and tough NCLF-reinforced polymer composites.
Article
Polymer Science
Ruth M. Muthoka, Pooja S. Panicker, Jaehwan Kim
Summary: This study used molecular dynamics simulation to investigate the alignment of cellulose under an electric field. The results showed that the electric field can induce the orientation of cellulose, and the alignment rate and ability depend on the field strength. Analysis of the cellulose structure revealed no significant effect of the electric field. The study highlights the importance of understanding cellulose alignment for developing new processing techniques.
Article
Chemistry, Multidisciplinary
Muhammad Latif, Yangxiaozhe Jiang, Bijender Kumar, Jong Min Song, Hyeon Cheol Cho, Jaehwan Kim
Summary: This study presents a simple and economical approach to manufacture 3D structures using high concentration nanocellulose paste cross-linked with citric acid. The optimized cross-linker greatly enhances the mechanical properties and shape fidelity of the 3D-printed nanocellulose structures.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Muhammad Latif, Yangxiaozhe Jiang, Bijender Kumar, Hyeon Cheol Cho, Jong Min Song, Jaehwan Kim
Summary: In recent years, the three-dimensional printing of environmentally friendly structures using high concentrations of nanocellulose (NC) has gained attention due to health and environmental concerns. This research presents an economical approach to printing such structures by directly extruding high-concentration NC paste and improving layer adhesion through the addition of low concentrations of polyvinyl alcohol (PVA). The resulting structures showed higher mechanical properties and shape fidelity compared to previous studies.
ACS APPLIED NANO MATERIALS
(2022)
Article
Polymer Science
Le Van Hai, Duc Hoa Pham, Jaehwan Kim
Summary: This study reports on the effects of multiple stage bleaching on compressed wood. After bleaching, the wood specimens became denser, and the porous structures collapsed. Changes in lignin content, alpha-cellulose content, and mechanical properties were observed.
Article
Chemistry, Multidisciplinary
Pooja S. Panicker, Dickens O. Agumba, Jaehwan Kim
Summary: This study reports a synergistic approach of wet spinning and coating cellulose nanofiber (CNF) with a bio-based and hydrogen-bonded polyvinyl alcohol-citric acid-lignin (H-PCL) resin, followed by esterification to form esterified poly(vinyl alcohol)-citric acid-lignin (E-PCL)-NCLF. The prepared fiber showed significant enhancements in mechanical properties, hydrophobicity, antioxidant activity, and thermal stability, making it a promising candidate for all-green natural fiber-reinforced polymer composites.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Dickens O. Agumba, Bijender Kumar, Pooja S. Panicker, Jaehwan Kim
Summary: This paper reports a biobased-interlayer glass composite that enhances the flexural strength and stiffness of glass while providing UV protection. The composite consists of benign materials and demonstrates improved mechanical properties compared to pure glass. It also effectively shields UV radiation and maintains high transparency in the visible range. This novel composite has potential applications in various fields such as greenhouse cover, automobile windshields, security, and museum artwork.
Article
Polymer Science
Muhammad Latif, Yangxiaozhe Jiang, Jongmin Song, Jaehwan Kim
Summary: Additive manufacturing technology has revolutionized the manufacturing process of polymer composites by enabling the construction of complex products with unique materials, functions, and structures. However, the printing of high-concentration nanocellulose structures using this technology often faces challenges related to adhesion and shape fidelity. This research presents an economical approach to fabricate structures by printing high-concentration nanocellulose layer-wise patterns. The study demonstrates the successful fabrication of two different composites and highlights the importance of optimal blend compositions and resin infusion methods in achieving high mechanical strength and interface adhesion.
Article
Materials Science, Multidisciplinary
Bijender Kumar, Samia Adil, Jaehwan Kim
Summary: Developing robust bio-based epoxy is crucial for creating environmentally friendly and high-performance natural fiber-reinforced composites. The synthesis of a bio-based vanillin epoxy (VE) from lignin-derived vanillin, mixed with a 4,4'-diaminodiphenyl methane (DDM) hardener, and infused in high-cellulose-containing alkali-treated jute fiber (TJF) mats, enhances adhesion and compatibility compared to petroleum-derived epoxy. The resulting VE-DDM/TJF composite exhibits excellent mechanical properties and resistance to environmental factors, making it a promising material for structural applications.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2023)
Article
Materials Science, Characterization & Testing
Samia Adil, Bijender Kumar, Pooja S. Panicker, Duc Hoa Pham, Jaehwan Kim
Summary: Developing high-performance composite materials from biobased resources is contributing to sustainability. This study presents a green composite made of cellulose long filaments (CLFs)-reinforced Vanillin Epoxy (VE) produced by vacuum-assisted resin transfer and compression molding techniques. The CLFs reinforcement significantly improved the flexural strength and modulus of the biobased VE resin by 135.1% and 542.8%. The green composite exhibited good thermal stability and hydrophobic properties with a Tg of 144 degrees C and a water contact angle (WCA) of 96.4o. Strong interactions between CLFs and the biobased VE epoxy resin were observed through SEM and FTIR analysis. These characteristics make the proposed green composite a robust material for environmentally friendly and high-performance structural applications.
Article
Polymer Science
Dinesh, Bijender Kumar, Jaehwan Kim
Summary: In this study, lignocellulosic pine needle fibers (PNFs) were used as a reinforcement in the thermoplastic elastomer styrene ethylene butylene styrene (SEBS) matrix to create environmentally friendly and economical PNF/SEBS composites. The addition of a maleic anhydride-grafted SEBS compatibilizer resulted in strong chemical bonds forming between the PNF, compatibilizer, and SEBS polymer, leading to enhanced interfacial adhesion in the composites. The prepared composites exhibited higher mechanical properties, as well as better dynamic mechanical behavior, indicating their potential for engineering applications.
Article
Chemistry, Multidisciplinary
Dickens O. Agumba, Duc Hoa Pham, Jaehwan Kim
Summary: The use of all-natural, biocompatible, and degradable materials in the production of straws and films has resulted in superior performance and potential for sustainable development.
Article
Chemistry, Multidisciplinary
Mijin Won, Gyeongseok Oh, Hyunah Lee, Jaehwan Kim, Dong-Soo Kim
Summary: This paper presents a method for manufacturing humidity sensors on curved surfaces using 3D printing technology. The sensors are fabricated by printing electrodes on flat and 3D curved glass substrates, and coating cellulose nanofibers as a sensing layer. The sensors demonstrate high repeatability and sensitivity.
Review
Polymer Science
Bijender Kumar, Dickens O. Agumba, Duc H. Pham, Hyun Chan Kim, Jaehwan Kim
Summary: This review article discusses the synthesis, properties, and applications of EU-based resins in coating applications, emphasizing their excellent performance and potential for development. Despite limited research, the interest in design strategies and properties of EU-based resins has been increasing due to their low cost and environmentally friendly characteristics.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
