Article
Biochemistry & Molecular Biology
Antonio M. Borrero-Lopez, Ling Wang, Haiming Li, Tainise Lourencon, Concepcion Valencia, Jose M. Franco, Orlando J. Rojas
Summary: Acetylated Kraft lignins were used to structure vegetable oils into oleogels. Microwave-assisted acetylation at higher temperatures resulted in gel-like oil dispersions with improved viscoelastic properties and stronger shear-thinning character, along with enhanced long-term stability. The modified lignins enhanced the stability of water-in-oil Pickering emulsions by enhancing hydrogen bonding between the oil and nanoparticles.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Chemistry, Multidisciplinary
Jianzhong Jiang, Shijie Yu, Wanqing Zhang, Haojie Zhang, Zhenggang Cui, Wenshui Xia, Bernard P. Binks
Summary: The novel charge-reversible surfactant can stabilize smart n-octane-in-water emulsions responsive to pH by transforming from anionic carboxylate to cationic form at different pH values. This allows for intelligent and precise control of stability, viscosity, and droplet size of the emulsions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Miao Lv, Qiao Meng, Wen Si, Mengyu Hao, Ru Han, Yuli Lai, Jianzhong Jiang, Zhenggang Cui
Summary: A CO2/N-2-switchable oil-in-dispersion emulsion was developed using a tertiary amine surfactant and alumina particles, allowing reversible demulsification/stabilization at room temperature. The emulsion's sensitivity to CO2/N-2 trigger under mild conditions requires less surfactant and particles, making it environmentally and economically attractive for various applications.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Multidisciplinary
Danhua Xie, Yulong Jiang, Kangling Li, Xinyue Yang, Yunjin Zhang
Summary: This study investigated the effects of nanoparticle morphology on the stability and stimuli-responsive properties of Pickering emulsions. The results showed that the morphology of nanoparticles plays a significant role in determining the stability and droplet size of Pickering emulsions.
Article
Biochemistry & Molecular Biology
Khanita Kamwilaisak, Kanokwan Rittiwut, Pasakorn Jutakridsada, Wimonporn Iamamorphanth, Nutsupa Pimsawat, Jesper T. N. Knijnenburg, Somnuk Theerakulpisut
Summary: This study modified rice starch nanoparticles and used them as emulsifiers in Pickering emulsions. The modified nanoparticles showed good hydrophobicity and emulsification properties, making them suitable for drug delivery.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Chemistry, Physical
Alban Gossard, Nicolas Fabregue, Thomas David, Agnes Grandjean
Summary: This study focuses on the influence of zeolite content on the microstructure of high internal phase emulsions (HIPEs) stabilized by tetradecyltrimethylammonium bromide (TTAB)-covered zeolite particles, highlighting the importance of understanding and controlling the emulsion microstructure.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Pharmacology & Pharmacy
Fatemeh Heidari, Seid Mahdi Jafari, Aman Mohammad Ziaiifar, Nicolas Anton
Summary: In this study, oil-in-water Pickering emulsions were prepared using modified silica nanoparticles and cetyltrimethylammonium bromide. The effects of different conditions on the physicochemical properties and stability of the emulsions were investigated. Results showed that temperature plays the most important role in the treatment of silica nanoparticles and determining the optimal experimental conditions.
Article
Chemistry, Multidisciplinary
Hemant Kumar, Venkateshwar Rao Dugyala, Madivala G. Basavaraj
Summary: The addition of oleic acid can modify the surface of hematite ellipsoids and induce the phase inversion of Pickering emulsions, resulting in the formation of nonspherical emulsion drops. The change in wettability of hematite particles due to the adsorption of oleic acid is established as the mechanism responsible for the phase inversion of Pickering emulsions.
Article
Chemistry, Multidisciplinary
Roxanne Fournier, Maximiliano Caye Diaz, Emily D. Cranston, John M. Frostad
Summary: Cellulose nanocrystals (CNCs) are sustainable particles that stabilize emulsions by adsorbing at droplet interfaces and providing a steric barrier. Adding salt can adjust the surface charges for increased droplet coverage. However, the interfacial tension and interfacial shear rheology are not strongly correlated with emulsion stability. Furthermore, at normal CNCs concentrations, the bulk rheology is significantly affected, making the details of interfacial rheology unimportant.
Article
Chemistry, Multidisciplinary
Bintao Hu, Yongliang Zhao, Zhangfan Ye, Haitao Wang
Summary: In this study, silica Janus nanosheets (JNs) with polyacrylic acid (PAA) chains were synthesized and used as Pickering stabilizer for water-in-water (w/w) emulsions. The interfacial area of w/w emulsions increased linearly with the concentration of silica JNs, and the interfacial coverage of nanosheets was calculated to be about 98%. The entrapped silica JNs at the interface of w/w emulsions with the smooth PAA-grafted surface located toward MAA-rich phase, indicating their specific interaction.
Article
Chemistry, Physical
Jean-Francois Dechezelles, Yaoyao Feng, Fadi Fadil, Veronique Nardello-Rataj
Summary: A series of PEG-functionalized silica nanoparticles with various molecular weights were prepared and used for the elaboration of temperature-responsive Pickering emulsions. The stability of the emulsions is determined by the hydrophilic/hydrophobic balance of the PEG/mPEG chains, and the distribution of the chains at the oil-water interface is modified with temperature, leading to a clear temperature-triggered destabilization of the emulsions.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Multidisciplinary
S. Karishma, Kirti Rajvanshi, Hemant Kumar, Madivala G. Basavaraj, Ethayaraja Mani
Summary: This study demonstrates that water-soluble homopolymers can stabilize oil-in-water emulsions, opening avenues for the use of eco-friendly biopolymers as alternatives to synthetic emulsifiers.
Article
Chemistry, Multidisciplinary
Zhangkun Ren, Lipei Fu, Wenzheng Chen, Xinxin Qiu, Lifeng Chen, Kaili Liao, Meng Wei, Minglu Shao
Summary: This study reports an emulsion synergistic-stabilized by hydroxyl sulfobetaine surfactant LHSB and SiO2 nanoparticles, which can enhance oil recovery in high temperature and high salinity reservoirs.
Article
Chemistry, Physical
Zhe Fan, Li Zhang, Wenwen Di, Kuncheng Li, Gongrang Li, Dejun Sun
Summary: The study showed that silica nanoparticles grafted with short-chain alkyl groups can stabilize Pickering emulsions, leading to weakly temperature-dependent rheological properties. The nearly constant rheological properties observed when using these nanoparticles are attributed to the nearly constant solvation in the temperature range studied, offering potential applications in the cosmetics and petroleum industries.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Sebastian Stock, Franziska Jakob, Susanne Roehl, Kevin Graeff, Matthias Kuehnhammer, Nicole Hondow, Stuart Micklethwaite, Matthias Kraume, Regine von Klitzing
Summary: The simultaneous stabilization of water droplets in a highly non-polar oil phase using temperature responsive, soft and hydrophilic PNIPAM microgel particles and solid and hydrophobic silica nanospheres allows for the formation of stable water-in-oil emulsions with a larger internal interface. This synergistic effect enables the particles to protect the droplets from coalescence and accelerate the emulsions sedimentation speed, while still maintaining the ability to redisperse the droplets by gentle shaking. The study provides a model to explain the phenomena observed in terms of droplet size measurements and cryo-SEM studies.
Article
Chemistry, Multidisciplinary
Kyungjun Kim, Dong Woo Kang, Chan Yeong Yun, Youngheon Choi, Jae W. Lee
Summary: This study investigates the reaction kinetics of high-pressure amination of polyalkylene glycol (PAG) to polyetheramine (PEA). The results show that the amount of NH3 significantly affects the reaction rate, contrary to previous studies. A Langmuir-Hinshelwood kinetic model is established to explain this effect. In addition, it is observed that the reverse reaction occurs in the absence of NH3.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Chaeyeong Seo, Heecheon Lee, Minyong Lee, Jae W. Lee
Summary: This study introduces a strategy for internal heat integration in reactive distillation columns, showing that utilizing two RD columns for different temperature reactions can reduce energy consumption.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Dong Kyu Lee, Chi Won Ahn, Jae W. Lee
Summary: TiO2-carbon nanosheets with high electrical conductivity were successfully synthesized by CO2 oxidation of Ti3C2 MXene. The synthesized TiO2-C NS, with a high TiO2 content of 98.45%, shows good capacity reversibility and stability, making it a promising anode material for lithium-ion batteries.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Ayeong Jo, Yikyeom Kim, Hyun Suk Lim, Minbeom Lee, Dohyung Kang, Jae W. Lee
Summary: This study focuses on the enhanced CO2 conversion of mesoporous La0.8Sr0.2FeO3 perovskite synthesized using a nanocasting method in the reverse water gas shift chemical looping process. The study investigates the effects of controlled template removal on the textural property and redox reactivity, and finds that optimizing the residual Si content at 10wt% maximizes the reactivity and capacity of reducible oxygen. The mesoporous LSF with this Si content achieves a significantly higher average CO yield compared to bulk LSF.
JOURNAL OF CO2 UTILIZATION
(2022)
Review
Engineering, Environmental
Ayeong Byeon, Won Chan Yun, Jong Min Kim, Jae W. Lee
Summary: This review focuses on the application of metal-free heteroatom-doped carbon catalysts in the electrochemical synthesis of hydrogen peroxide through the two-electron oxygen reduction reaction (2e(-) ORR). The electronic properties of carbon can be changed depending on the type of heteroatoms, which significantly affect the ORR catalytic activity. The location of active catalytic sites within the carbon network and the reaction environment, such as pH and electrolyte additives, are also investigated. This review provides fundamental insights into how heteroatoms enhance the electrocatalytic activity of metal-free carbon materials for the 2e(-) ORR.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Jeongwoo Yang, Dong Woo Kang, Hodong Kim, Byunghoon Hwang, Jae W. Lee
Summary: The use of a free-standing carbon interlayer in lithium-sulfur batteries shows promise due to its ability to suppress the shuttle effect and provide flexibility. However, the thickness of the interlayer inhibits Li-ion transport. This study addresses this issue by synthesizing a composite with superior pore characteristics and evenly distributed catalytic sites, resulting in improved Li-ion diffusion and redox reaction.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Electrochemistry
Byunghoon Hwang, Jeongwoo Yang, Dohyeun Kim, Won Chan Yun, Jae W. Lee
Summary: We designed a membraneless potassium bromide electrochemical capacitor (ML-PBEC) single cell that generates high energy density and reduces self-discharge. Highly porous carbon with a hierarchical structure was synthesized from CO2 gas, and the effect of nitrogen doping on the CO2-derived carbon materials' electrochemical performance was investigated. The ML-PBEC single cell, using the synthesized carbon as electrodes and a Br-/Br3- redox active aqueous electrolyte, achieved enhanced energy density by suppressing the cross-diffusion of soluble bromine molecules through electrostatic interaction between N-doped sites' protons and polybromide anions even without a membrane.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Multidisciplinary
Jeil Park, Wonhyeong Lee, Jae W. W. Lee
Summary: This study explored the impact of dual impeller geometry on droplet size in the S-PVC polymerization process. A borescope method was used to measure droplet size in a biphasic liquid system, and it was found that replacing the upper paddle impeller with a 20-degree pitched paddle increased the Sauter mean diameter by 46.5%. The Sauter mean diameter also increased with larger impeller diameter and blade width. A revised geometrical factor (F) was considered, and a calculated maximum energy dissipation rate was used to establish a correlation for the Sauter mean diameter.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Dasol Bae, Yikyeom Kim, Eun Hee Ko, Seung Ju Han, Jae W. Lee, Minkyu Kim, Dohyung Kang
Summary: This study investigated the reaction kinetics and mechanism of CH4 pyrolysis in mixtures of molten MnCl2 with various chlorides, and found that MnCl2-KCl mixture showed the lowest apparent activation energy and the highest crystallinity. This suggests that MnCl2-KCl has unique pathways for methane dehydrogenation and carbon formation.
Article
Green & Sustainable Science & Technology
Wonhyeong Lee, Dong Woo Kang, Yun-Ho Ahn, Jae W. Lee
Summary: In this study, a mixture of hydrate seed solution and liquid phase thermodynamic promoter was introduced to promote the formation of hydrogen hydrates for safe hydrogen storage.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Ki Heum Park, Jae W. Lee, Yutaek Seo
Summary: In this study, a VOC recovery process based on selective condensation was developed. By analyzing the economic benefits, the process efficiency was optimized, and a cascade refrigerant system using carbon dioxide and ammonia was proposed to achieve more efficient and eco-friendly operation of the VOC recovery system.
JOURNAL OF CO2 UTILIZATION
(2023)
Article
Energy & Fuels
Donggun Kim, Minyong Lee, Yongbeom Shin, Jeongwoo Lee, Jae W. Lee
Summary: This study presents a novel process for the direct production of diethyl carbonate and ethylene glycol from ethylene carbonate and ethanol through reactive distillation. By integrating reactive distillation systems and eliminating the need for separating the azeotrope mixture, an energy-efficient process is achieved. Two design alternatives are proposed, with both resulting in reductions in energy consumption, cost, and CO2 emissions compared to conventional processes. These alternatives demonstrate their economic viability and effectiveness in CO2 mitigation.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Engineering, Environmental
Yikyeom Kim, Hyeon Seok Kim, Dohyung Kang, Minkyu Kim, Jae W. Lee
Summary: Chemical looping steam methane reforming (CL-SMR) can produce high-purity hydrogen without additional separation units. The reactivity of LaFeO3 oxygen carrier towards methane can be enhanced by introducing a small amount of iridium. Both particle reduction and oxidation were significantly improved by the presence of iridium, and the preparation pathways of oxygen carriers greatly affected the long-term performance. Although surface iridium species prepared by an impregnation method were severely aggregated during successive redox cycling, B-site incorporation of iridium led to the exsolution of IrOx nanoparticles anchored on the perovskite host and enhanced redox stability, which is essential for the long-term operation of the chemical looping process.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Electrochemistry
Ayeong Byeon, Won Chan Yun, Jong Min Kim, Jae W. Lee
Summary: Hydrogen peroxide is widely used in various industries for different purposes, such as water purification and rocket fuels. The conventional method of hydrogen peroxide production consumes a lot of energy and generates chemical waste. Therefore, there is a growing interest in the electrochemical production method using non-precious metal catalysts, such as transition metals and heteroatoms, for eco-friendly and low-energy synthesis. This review focuses on the modification of atomic configuration to enhance the catalytic activity of non-precious metal catalysts for the two-electron oxygen reduction reaction (ORR).
Article
Chemistry, Multidisciplinary
Jeil Park, Wonhyeong Lee, Jae W. W. Lee
Summary: This study investigated the impact of dual impeller geometry on droplet size in S-PVC polymerization process and proposed a correlation equation to estimate droplet size with a certain margin of error, aiding in predicting the normality of the polymerization reaction under specific impeller geometry.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2023)