Article
Chemistry, Physical
Ying Li, Na Du, Shue Song, Wanguo Hou
Summary: This study investigated the size-dependence of surface hydroxyl dissociation of solid nanoparticles dispersed in aqueous solutions. Nine amorphous silica samples with different radii were used to develop size-dependent models for effective surface hydroxyl density and dissociation equilibrium constants. The results showed a clear size-dependence, with Nseff and pKa decreasing as the particle radius decreased. The study deepened the understanding of size-dependent solid/liquid interface phenomena.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Engineering, Chemical
Yubai Liu, Thomas Pelster, Ting-Tai Lee, Yujun Wang, Guangsheng Luo
Summary: The growth process of silica nanoparticles prepared by adding sulfuric acid dropwise into waterglass was investigated. Three stages of growth were observed, and the hydrolysis and condensation reactions were analyzed. The particle size changes in the growth stage were fitted using the LSW model, and the formation of pore structures was studied.
Article
Chemistry, Inorganic & Nuclear
Dieter Klintuch, Mark Hoefler, Till Wissel, Clemens Bruhn, Torsten Gutmann, Rudolf Pietschnig
Summary: A synthetic strategy was developed for the preparation of beta-silylphospholes attached to silica particles and POSS as a molecular model, with studies on their luminescent properties compared to free phospholes. The electronic perturbation of the phosphole system by the trifunctional silyl anchoring unit was investigated through density functional theory calculations. Cross-polarization magic-angle-spinning NMR measurements, thermogravimetric analysis, X-ray photoelectron spectroscopy, and X-ray diffraction were utilized for characterization and bonding analysis.
INORGANIC CHEMISTRY
(2021)
Article
Engineering, Environmental
Ziqi Zhao, Meng Li, Wansong Huang, Nuowei Guo, Qian Zhang
Summary: By investigating the morphology distributions of residual aluminum salts (RAS) and their effects on activated sludge (AS) removal efficiency under different PAC concentrations, this study found that the dominance of medium polymeric RAS formed under an appropriate PAC dose can enhance the performance of AS in terms of hydrophobicity, flocculation, sedimentation, and enzymatic activity, improving pollutant removal efficiency. However, under an over-dosed PAC concentration, the excessive secretion of EPS and the inhibition of cellular activity caused by monomer and dimer/high polymer RAS resulted in the deterioration of AS properties.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2023)
Article
Polymer Science
Lun Ge, Qiang Liu
Summary: An effective method to cure hydroxyl-functionalized rubbers/silica composites with blocked polyisocyanates was reported, avoiding the use of any other additives. The enhanced dispersion of silica by interaction with hydroxyl groups on molecular chains endowed the composites with high mechanical performance.
Article
Chemistry, Physical
Mahdi Hasanzadeh Azar, Maryam Mohammadi, Nima Tabatabaei Rezaei, Samaneh Aynehband, Abdolreza Simchi
Summary: In this study, stable perovskite nanocrystals were prepared using a new method, which exhibited excellent optical properties and thermal stability even under high humidity. Furthermore, white light-emitting diodes (LEDs) were successfully fabricated using these nanocrystals, surpassing many traditional LEDs in terms of color range.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Ricardo Alvarado Meza, Tom Santori, Xavier Cattoen
Summary: The synthesis of mesoporous silica nanoparticles (MSNs) for nanomedicine applications is influenced by various experimental factors and lacks reproducibility. This study used pH measurements and light diffusion monitoring to investigate the early stages of MSNs synthesis. The results revealed two hydrolysis regimes before nanoparticle formation, and the condensation reaction only initiated after silicate-surfactant micelle aggregation. Factors like stirring strength and presence of sodium hydroxide carbonates significantly affected the kinetics and size of MSNs formation, requiring careful control for reproducibility. The study proposed a formation mechanism that emphasized the interplay between chemical and physicochemical processes in this complex system.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Xiao Xu, Haotian Liu, Jian Wang, Ting Chen, Xing Ding, Hao Chen
Summary: The surface hydroxyl groups (SHGs) on the interface of nanomaterials play a crucial role in environmental purification technologies, influencing reaction kinetics, energetics, and mechanisms, and are important in the removal of harmful substances. Further research on SHGs' chemical behavior can help innovate environmental catalysis theories and design catalysts with better performance.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
Guangyan Hu, Shengming Jin, Kun Liu
Summary: The effect of the microstructure of a sodium silicate solution on the growth behavior of silica nanoparticles was investigated. The solution contained three types of particles: monomers, SiO2 clusters, and large colloidal particles. The primary particles in the sodium silicate solution exhibited a structure-directing effect on the formation of silica nanoparticles. The understanding of the sodium silicate structure and its regulation mechanisms provided a theoretical foundation for fabricating high-performance silica.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Biochemistry & Molecular Biology
Tetsuo Yamaguchi, Taeho Kim, Jin-Kuen Park, Jae-Min Oh
Summary: The release of ferulic acid from surface-functionalized hollow nanoporous silica particles (HNSPs) was studied. HNSPs were synthesized in the presence of polymer and surfactant templates, and the pores and surfaces were modified through silane coupling reactions. The release rates in DI water and ethanol were highest for HNSP, followed by PTS-HNSP, and lowest for OTS-HNSP.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Applied
Alessandro Gottuso, Francesco Armetta, Alessio Cataldo, Viviana Mollica Nardo, Francesco Parrino, Maria Luisa Saladino
Summary: In this study, three different functionalized mesoporous silica nanoparticles were synthesized through co-condensation in oil/water emulsion, using various organo-substituted silica precursors. The influence of different pendant groups and their concentrations on the mesostructured pore organization of the nanoparticles was evaluated using spectroscopy and microscopy techniques. Results showed that bulky aliphatic C16 chains, especially in higher concentrations, led to significant changes in mesoporous structure.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Materials Science, Ceramics
Yoshitaka Ono, Sho Nagai, Yasuo Hayashi, Shu-hei Urashima, Hiroharu Yui
Summary: Etching of SiO2 is important in the production of silica glass components and semiconductor devices. Wet-etching with hydrogen fluoride (HF) solutions is commonly used, but faces issues with microstructure sticking during solution drying. To overcome this, a dry-etching technique with gaseous HF at high temperatures was developed. Interesting results showed that silicon thermal oxides were less etched than vitreous silica by gaseous HF, indicating a difference in surface species affecting the reaction rate.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
He Dong, Yandong Han, Wensheng Yang
Summary: By using tetrabutylammonium hydroxide as a co-catalyst of ammonia in a modified Sto center dot ber method, fractal-like shaped silica particles were successfully prepared. The strong alkalinity of TBAOH promoted the hydrolysis/condensation of TEOS and suppressed electrostatic repulsion among the silica particles, leading to growth following the aggregation-only model.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Polymer Science
Max Briesenick, Markus Gallei, Guido Kickelbick
Summary: High-refractive-index polysiloxanes with different groups were synthesized and their transparency and refractive index were increased through thermal consolidation to form hybrid inorganic-organic resins. The size of the polycyclic aromatic substituent affects the excimer formation in the polymeric material. The final resins exhibit high thermal stability and are suitable for high-temperature optical applications.
Article
Engineering, Environmental
Zhilin Zhang, Guangzhi He, Yaobin Li, Changbin Zhang, Jinzhu Ma, Hong He
Summary: Pt-Na/Al2O3 catalysts with controlled Pt anchoring have been prepared, and the catalytic mechanism of formaldehyde oxidation on Pt-Na/Al2O3 catalysts has been revealed.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
The Ky Vo, Tra Phuong Trinh, Van Cuong Nguyen, Jinsoo Kim
Summary: In this study, a series of hybrid GrO/MIL-101(Cr) (GrO@MCr) nanocomposites were prepared via hydrothermal synthesis, showing increased adsorption capacities for organic pollutants MO and RB198. The adsorption mechanism was detailedly studied in this research.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Chemistry, Applied
The Ky Vo, Van Cuong Nguyen, Duong Tuan Quang, Bum Jun Park, Jinsoo Kim
Summary: The rapid construction of defects in metal-organic frameworks using microwave-assisted reactors can significantly impact porosity and CO2 adsorption capabilities of the material. The concentration of defects influences the amount of CO2 uptake and selectivity, surpassing those of conventionally prepared materials.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Jin Hyuck Heo, Kyungmin Im, Hyong Joon Lee, Jinsoo Kim, Sang Hyuk Im
Summary: Ni,Ti-co-doped MoO2 nanoparticles were synthesized with excellent moisture stability and improved conductivity for use as hole transporting material in metal halide perovskite solar cells. The Ni,Ti-doped MoO2 showed better reduction stability and achieved a power conversion efficiency of 18.1% under standard conditions. Additionally, the unencapsulated Ni,Ti-co-doped MoO2 showed only a 12-13% degradation after a stability test, indicating promising potential for practical applications.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Energy & Fuels
Jungyeon Ji, Kyungmin Im, Heeyeon An, Sung Jong Yoo, Yongjin Chung, Jinsoo Kim, Yongchai Kwon
Summary: Hollow cobalt nitrogen-doped carbon (H-CoNC) is proposed as an anodic catalyst for membraneless hydrogen peroxide fuel cells (HPFC) and enzymatic biofuel cells (EBC), demonstrating superior catalytic activity for hydrogen peroxide oxidation reaction (HPOR) due to its porous and hollow-shell structure, along with a large amount of isolated Co atoms and coordinate bonds with Co and nitrogen (Co-N-4). The improved mass transfer to the active site results in enhanced current density at the bioanode and higher maximum power density (MPD) for both EBC and HPFC when using H-CoNC compared to conventionally synthesized catalysts.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Applied
The Ky Vo, Van Nhieu Le, Duong Tuan Quang, Jinsoo Kim
Summary: This study developed a facile and scalable synthesis method for CuCl@gamma-Al2O3 composite microspheres for CO storage and separation. By adjusting the CA/boehmite ratio, fine-tuning of mesopores and pore volumes was achieved, leading to improved CO sorption and CO/CO2 selectivity.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Van Nhieu Le, Daekeun Kim, Jinsoo Kim, Mohd Roslee Othman
Summary: Nanoporous UiO-66 spherical beads prepared using PVA binder improved the mechanical strength for toluene capture without affecting crystalline nature and micropore structures. However, the PVA binding reduced the BET surface area and total pore volume, resulting in a slight decrease in toluene adsorption efficacy by limiting toluene exposure to micropores.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Physical
Quoc Hao Nguyen, Kyungmin Im, Jinsoo Kim
Summary: In this study, hollow Fe, Co, and nitrogen co-doped carbon catalyst with high surface area and uniformly distributed Fe and Co species was prepared, demonstrating excellent ORR performance, stability, and tolerance to methanol crossover.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Toan Minh Pham, Kyungmin Im, Jinsoo Kim
Summary: This study presented a tungsten-modified titanium dioxide support for platinum catalyst, which showed improved catalytic activity and stability, offering a potential solution to the carbon corrosion issue in proton exchange membrane fuel cells.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Sion Oh, Kyungmin Im, Jinsoo Kim
Summary: Developments in fuel cell technology have led to the design of efficient electrocatalysts for the oxygen reduction reaction (ORR). Metal-nitrogen-carbon (M-N-C) catalysts, particularly carbon nanotube-encapsulated hollow Co-Fe-NC electrocatalysts, show promising catalytic activity and excellent selectivity for ORR. However, the synthesis of carbon-based metal electrocatalysts with evenly distributed active sites and well-controlled structures remains challenging.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Thuan Anh Vo, Yoonmo Koo, Jinsoo Kim, Seung-Soo Kim
Summary: This study characterized non-precious metal catalysts over activated carbon and TiO2-SiO2 supports loaded via incipient wetness impregnation and spray pyrolysis. The research found that activated carbon exhibited better performance in syringol conversion and hydrocarbon selectivity compared to TiO2-SiO2. Additionally, the Ni catalyst showed more effective hydrodeoxygenation performance compared to Fe and NiFe catalysts. The study provides a promising potential for the utilization of non-precious metals and biomass-derived activated carbon in removing oxygen from bio-oil model compounds, contributing to sustainable renewable energy development.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Hind Jihad Kadhim Shabbani, Ammar Ali Abd, Tharveen Raj Rajalingam, Jinsoo Kim, Mohd Roslee Othman, Zuchra Helwani
Summary: This study investigates the use of microporous APKS and ZIF-8 adsorbents for capturing carbon dioxide from flue gas surrogate. The lab simulated and experimented with the purity and recovery of N2 and CO2 in the product and waste stream. The results show that factors like adsorbent type, adsorption times, and CO2 concentration influence the N2 purity in the product stream, while CO2 feed compositions, adsorbent type, and pressure swing operation affect the purity and recovery of CO2 in the waste stream.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Dieu-Phuong Phan, Toan Minh Pham, Hojin Lee, My Ha Tran, Eun Duck Park, Jinsoo Kim, Eun Yeol Lee
Summary: A series of zeolite-porous metal-organic framework composites with different Pt loadings were synthesized via a two-step approach. The Pt-loaded composites showed improved acidity compared to the parent materials and demonstrated high catalytic performance and stability in the selective hydrodeoxygenation process.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Applied
Van Nhieu Le, Van Cuong Nguyen, Huu Trung Nguyen, Hoai Duc Tran, Thach N. Tu, Woo-Sik Kim, Jinsoo Kim
Summary: Bimetallic metal-organic frameworks with two different metal species demonstrate higher effectiveness in CO2 capture and separation performance than their monometallic counterparts. A series of bimetallic MIL-100(Fe, Al) was synthesized by adding Fe and Al metal precursors with various molar ratios. Among the investigated samples, MIL-100(Fe, Al)#2 showed the highest CO2 adsorption capacity of 3.27 mmol g-1 with an IAST-CO2/N2 selectivity of 76.5 at 25 degrees C and 1 bar. This facile synthetic route has the potential to enhance CO2 adsorption performance.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Energy & Fuels
Hind Jihad Kadhim Shabbani, Ammar Ali Abd, Masad Mezher Hasan, Zuchra Helwani, Jinsoo Kim, Mohd Roslee Othman
Summary: The study investigated hydrogen purification from a surrogate gas using spent coffee grounds as a medium. The process was examined under isothermal, adiabatic, and non-adiabatic conditions using Aspen adsorption software. The results showed that spent coffee grounds can effectively purify hydrogen, and a rectangular non-adiabatic plate column can enhance the purification process by improving purity and recovery responses.
GAS SCIENCE AND ENGINEERING
(2023)
Article
Nanoscience & Nanotechnology
Jaehyung Choi, Kye Sang Yoo, Daekeun Kim, Jinsoo Kim, Mohd Roslee Othman
Summary: This study successfully developed microporous Mo-UiO-66 nanoparticles through a solvothermal procedure, with a requirement of 40% excess Mo content. The resulting octahedron crystals had a size of about 80 nm and a large surface area of 1158 m(2)/g.
ACS APPLIED NANO MATERIALS
(2021)