Article
Chemistry, Physical
Tianchi Cao, Menachem Elimelech
Summary: The aggregation kinetics and surface charging properties of rod-like sulfated cellulose nanocrystals (CNCs) in aqueous suspensions with monovalent, divalent, or trivalent inorganic salts were investigated. The phenomenon of charge neutralization and charge reversal was observed with divalent and trivalent salts, impacting the colloidal stability of the CNCs significantly. These findings have important implications for applications of CNCs in nanotechnology and materials science.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Engineering, Environmental
Jing Li, Jiawei Dong, Yanshan Huang, Jiana Su, Yu Xie, Yundang Wu, Wei Tang, Yongtao Li, Weilin Huang, Chengyu Chen
Summary: This study investigated the aggregation kinetics of three types of titanium dioxide nanoparticles (TiO2 NPs) in human sweat and artificial sweat. Factors such as particle concentration, sweat type, and inorganic and organic constituents were examined. The results showed that most TiO2 NPs remained stable in human sweat samples and their aggregation rates were negatively correlated with zeta potentials. The TiO2 NPs aggregated more rapidly in artificial sweat and were stabilized by organic constituents through steric hindrance. Higher concentrations of particles and certain constituents destabilized the TiO2 NPs, while urea inhibited their aggregation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Ayten Ates
Summary: TiO2 samples with different crystal sizes and compositions were synthesized using a sol-gel method at different calcination temperatures. Increasing calcination temperature and SCW gasification/SCW treatment decreased the surface area of anatase TiO2 due to growing crystallite size. Among anatase and rutile TiO2 samples, optimal materials for hydrogen formation from formaldehyde in SCW were found. An increase in CO2 formation in the presence of anatase TiO2 was observed compared to rutile TiO2 due to active lattice oxygen species.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Zhian Pu, Xin Fan, Jing Su, Min Zhu, Zhenlin Jiang
Summary: Polymeric dispersants with varying side chain lengths were synthesized and used for the dispersion of organic pigment. Longer side chain lengths resulted in smaller particle size and stronger stabilizing effect.
COLLOID AND POLYMER SCIENCE
(2022)
Review
Chemistry, Multidisciplinary
Maela Manzoli, Francesca S. Freyria, Nicola Blangetti, Barbara Bonelli
Summary: This article reviews the advancements in the study of phase-pure brookite and brookite-containing TiO2 mixed phases, emphasizing their potential applications in photocatalysis. It is important to understand the roles of brookite-containing heterojunctions, surface properties, crystalline structure, and their influence on phase transitions for their applications in catalysis and electrochemistry.
Article
Chemistry, Physical
Akio Sayano, Hiroyuki Ohshima, Takuya Hoshina, Takaaki Tsurumi
Summary: The experimental stability of hematite particles in solutions with different salinity deviates from the predictions of the DLVO theory. Modifying the particle radius used in calculations can match the experimental values for untreated and heat-treated particles. Atomic force microscopy measurements reveal a correlation between the curvature radius of surface protrusions and the interaction energy between particles. This suggests that the stability ratio of these particle dispersions is governed by the curvature radius, not the overall particle radius.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Environmental Sciences
Zhiwei Shao, Jiana Su, Jiawei Dong, Miaoting Liang, Jie Xiao, Jindie Liu, Qiaoyun Zeng, Yongtao Li, Weilin Huang, Chengyu Chen
Summary: This study investigated the aggregation kinetics of four common polystyrene nanoplastics (PSNPs) in gastric conditions. The results showed that different simulated human gastric fluids, pH levels, and nanoplastics concentrations influenced the aggregation rate. Furthermore, pepsin, glycine, and protein corona affected the stability of PSNPs through electrostatic interaction and steric hindrance.
ENVIRONMENT INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Junjie Zheng, Pei Shi, Chi Chen, Xin Chen, Yi Gan, Jingying Li, Jia Yao, Yin Yang, Lin Lv, Guokun Ma, Li Tao, Hanbin Wang, Jun Zhang, Liangping Shen, Houzhao Wan, Hao Wang
Summary: In this study, Mo-doped a-MnO2 was chosen as the cathode material and a stable N-H bond reinforced interaction was formed via NH4+ intercalation to stabilize the 2 x 2 tunnel structure of Mo-MnO2. Theoretical and experimental studies demonstrated the improved performance of the cathode in terms of cyclic stability and electrochemical performance. This work provides further understanding of the bond interaction between nonmetallic cations in the main materials of electrodes and contributes to the development of aqueous-based zinc-ion batteries with high energy density and long-term cycling capability.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Chenfan Liu, Yu Zhang, Huanhuan Cheng, Xuanxuan Cai, Dianzeng Jia, He Lin
Summary: In this paper, it is found that excessive NH4+ in the vanadium-based cathode material NH4V4O10 affects the structural stability and reduces the reaction kinetics of AZIBs. By removing part of the NH4+ through heat treatment and introducing Al3+ through hydrothermal method, the zinc storage properties of the material are enhanced, leading to excellent electrochemical performance. This study provides valuable insights for the development of high performance AZIBs cathode materials.
Article
Materials Science, Multidisciplinary
Benjamin Emley, Yanliang Liang, Rui Chen, Chaoshan Wu, Miao Pan, Zheng Fan, Yan Yao
Summary: The correlation between solid loading and quality of thin sulfide SE films was found, with a method for quantifying film quality by observing defects and agglomerations of particles. Adding approximately 5 wt% binder in the preparation of thin sulfide SE films resulted in defect-free films with similar ionic conductivity.
MATERIALS TODAY PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Ahlem Bendaoued, Mouna Messaoud, Omar Harzallah, Sophie Bistac, Rached Salhi
Summary: In this paper, nanofillers obtained by Sol-gel method were added as fillers in polypropylene composites to enhance the thermal and rheological properties and ensure good interface compatibility. The synthesized nano-TiO2 powders exhibited excellent thermal stability and viscoelasticity. The study showed that the molar ratio of TiO2 influenced the final thermal stability and degree of crystallinity of the polypropylene matrix. The incorporation of 5wt% TiO2 was found to be an effective and promising method to improve the rheological properties of the resulting composite.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Polymer Science
Longyu Tian, Min Wang, Guangming Liao, Baoliang Liu, Sujuan Zhang, Yucheng Sun, Zhen Meng, Jintao Zhang, Zaijun Lu
Summary: Two kinds of benzoxazine monomers were synthesized and used to prepare polybenzoxazine anion exchange membranes (AEMs) with quaternary ammonium functionalization. The LQPBZ AEM exhibited better ion conductivity and alkaline stability.
Article
Chemistry, Multidisciplinary
Mengmei Yang, Songlin Zuo, Xin Hu
Summary: By using graphite-like crystalline nanosheets (GCNs) with high hydrophilicity, high-concentration carbon nanomaterial aqueous suspensions (200 mg mL(-1)) are obtained. These high-concentration GCN suspensions can spontaneously transform into gels when induced by mono-, di-, and trivalent metal salt electrolytes at room temperature. The gelated GCNs represent a new and metastable state between solution and coagulation, and their gelation is attributed to the preferential orientation of nanosheets in an edge-edge arrangement.
Article
Chemistry, Physical
Ananda J. Jadhav, Mostafa Barigou
Summary: Bulk nanobubbles, with an average diameter of around 100 nm, form stable clusters in pure water and exhibit different stability in different media. The study reveals that bulk nanobubbles tend to behave similarly to solid nanoparticles in terms of agglomeration tendency, which has significant implications for our understanding of their behavior and stability.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Environmental Sciences
Chaomeng Dai, Hui Shen, Yanping Duan, Xueji You, Xiaoying Lai, Shuguang Liu, Yalei Zhang, Leong Kah Hon, Kitae Baek, Yaojen Tu, Lang Zhou, Di Xu
Summary: The study found that the presence of anionic surfactant SDBS increased the stability and reduced aggregate size of nTiO(2) and nCeO(2), resulting in higher concentrations in effluents. Conversely, the cationic surfactant CTAB decreased the transportability of NPs due to positive charge attachment, causing NP deposition. Tween-80 had no significant impact on the stability and mobility of the nanoparticles. The results have implications for assessing and remediating NP pollution in subsurface environments.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
