Article
Environmental Sciences
Yong Liu, Jie Ma, Jiaoli Gao, Xingyi Chen, Xiaoxue Ouyang, Liping Weng, Haiming Li, Yali Chen, Yongtao Li
Summary: This study investigates the interaction and heteroaggregation of biochar nanoparticles (BCNPs) and iron mineral nanoparticles (IMNPs) in soil remediation. The results demonstrate that pH, humic acid (HA), and ionic strength (IS) play significant roles in the settling and stability of nanoparticles.
Article
Environmental Sciences
Hao Wang, Xuejiao Han, Yao Chen, Wenjing Guo, Wenli Zheng, Nan Cai, Qingwei Guo, Xiaoli Zhao, Fengchang Wu
Summary: This study investigated the effect of different anions on the aggregation of Fe3O4 MNPs in the aqueous phase, and found that the type, concentration, hydration ability, solution pH, and magnetic force of the anions differed, leading to varying colloidal behaviors of MNPs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Mechanical
Xue Han, Steven J. Thrush, Zhenpu Zhang, Gary C. Barber, Hongwei Qu
Summary: Thread galling is a common problem when tightening fasteners, and in this study, the potential of zinc oxide nanofluids as thread lubricants was investigated. By finding suitable surfactants for dispersing and stabilizing the nanoparticles, the goal is to eliminate or minimize galling. PIBSA mixed with ZnO nanoparticles showed superior dispersion and stability compared to OA mixed with ZnO nanoparticles.
Article
Chemistry, Multidisciplinary
Mohammad Rashedul Hasan, Bart-Jan Niebuur, Martin Siebrecht, Bjorn Kuttich, Ralf Schweins, Asaph Widmer-Cooper, Tobias Kraus
Summary: Solvent engineering provides a powerful method to control the colloidal stability of nanoparticles. In this study, the molecular structure of ligand shells on gold nanoparticles was found to affect their stability in solvent mixtures. The agglomeration temperature of the nanoparticles depended on the solvent composition and exhibited different trends in different solvent mixtures. Molecular dynamics simulations revealed that temperature-dependent ligand order played a dominant role in the agglomeration process, while the solvent composition near the ligands significantly influenced the ligand shell ordering. The results highlight the importance of ligand-solvent and solvent-solvent interactions in determining the colloidal stability of nanoparticles in solvent mixtures.
Article
Chemistry, Physical
Daniel Hatchell, Wen Song, Hugh Daigle
Summary: This study investigates the impact of interparticle forces on the stability of Pickering emulsions. The findings demonstrate that surface modification and particle interactions can significantly improve the stability of emulsions.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Chemical
Song Zou, Shuai Wang, Hong Zhong, Wenqing Qin
Summary: The study investigated the hydrophobic agglomeration of rhodochrosite fines in aqueous suspensions with sodium oleate using various techniques such as wettability measurement, optical microscopy observation, laser-based particle size detection, micro-flotation test, and zeta potential measurement. The results showed that the hydrophobicity of rhodochrosite played a key role in the agglomeration process, with higher concentrations of sodium oleate leading to larger and more regular agglomerates. Despite an increase in the negative zeta potential of rhodochrosite, the hydrophobic agglomeration interaction improved the micro-flotation recovery of rhodochrosite fines, indicating that chemical adsorption played a primary role in the interaction between sodium oleate and rhodochrosite.
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)
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
Multidisciplinary Sciences
O. O. Daramola, A. A. Akinwande, A. A. Adediran, O. A. Balogun, J. L. Olajide, K. J. Adedoyin, B. O. Adewuyi, T. C. Jen
Summary: The mechanical properties of coconut shell ash (CSA) reinforced polyester composite were optimized by varying the particle size and proportion of CSA. It was found that 10-20 wt.% CSA increased tensile, flexural, and impact strengths, as well as flexural modulus, while 30-40 wt.% CSA resulted in decreased performance. Additionally, the finest CSA particles (20 μm) showed the best results in all cases.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Chemical
Wei Li, Yanfang Cui, Zuchao Pan, Fen Jiao, Congren Yang, Xu Wang, Zhengquan Zhang, Wenqing Qin
Summary: This study investigated the effect of kerosene and sodium oleate on the flotation of fine cassiterite. The results showed that adding kerosene before sodium oleate resulted in higher recovery due to the more dense and regular agglomerate structure with stronger hydrophobicity.
Article
Chemistry, Multidisciplinary
Jialing Hu, Bingjie Zhao, Rongrong Wen, Xuebo Zhang, Yunxiang Zhang, Daniel S. S. Kohane, Qian Liu
Summary: Researchers have developed a new design strategy using a squaraine-based dye to enhance the light absorption ability and stability of upconversion nanoparticles. The dye, SQ-739, has a maximum absorption at 739 nm and shows improved chemical- and photostability compared to the commonly used cyanine-based dye IR-806. The study provides a new approach for developing highly stable and efficient NIR upconversion probes.
Article
Chemistry, Multidisciplinary
Andrea Pyttlik, Bjoern Kuttich, Tobias Kraus
Summary: Gravity can affect the agglomeration of nanoparticles by changing convection and sedimentation. The study found that the agglomeration of gold nanoparticles was more pronounced in microgravity, suggesting a process closer to the diffusion limit.
Article
Engineering, Environmental
Wenpei Wu, Xueyan Chen, Lu Han, Lei Yang, Mingyue Gu, Jing Li, Mengfang Chen
Summary: The heteroaggregation mechanism between nZVI and four types of natural soil nanoparticles from northern and southern China was studied. It was found that stable nZVI-SNPs heteroaggregates were formed at low ionic strength, but SNPs accelerated the aggregation of nZVI at high ionic strength. The differences in heteroaggregation rates of nZVI with four SNPs were negligible.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Physical
Mengjia Zhang, Song Wei, Shunan Dong, Wei Wei, Yong Zhang
Summary: Biogenic nano-hydroxyapatite (bHAP) has the potential to remediate heavy metal contaminated soil. However, little is known about the impact of anionic surfactants on bHAP transport in saturated porous media. This study explored the mobility of bHAP in sand columns with sodium dodecyl sulfate (SDS) and found that bHAP was transported in the presence of SDS, with mobility increasing with SDS concentration and pH. However, higher ionic strength hindered bHAP transport. The study provided a comprehensive understanding of bHAP transport affected by SDS, which is necessary for evaluating its efficacy in soil and groundwater remediation.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Materials Science, Multidisciplinary
Mert Saracoglu, Merve B. Bacinoglu, Siddika Mertdinc, Servet Timur
Summary: In this study, sericin was used as a stabilizer to successfully synthesize silver nanoparticles with high stability. The characteristics of Ag-Ser NPs were investigated using FT-IR, DLS, and TEM, showing that the nanoparticles had a narrow size distribution and spherical shape. The study also emphasized the importance of pH and electrolyte concentration in nanoparticle stability.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Environmental Sciences
Sandile Simelane, Langelihle Nsikayezwe Dlamini
JOURNAL OF ENVIRONMENTAL SCIENCES
(2019)
Article
Nanoscience & Nanotechnology
Qedile I. Zwane, Sharon Moeno, Langelihle N. Dlamini
APPLIED NANOSCIENCE
(2019)
Article
Environmental Sciences
M. M. Thwala, L. N. Dlamini
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2019)
Article
Nanoscience & Nanotechnology
Lwazi Charles Mahlalela, Cintia Casado, Javier Marugan, Santiago Septien, Thabile Ndlovu, Langelihle Nsikayezwe Dlamini
APPLIED NANOSCIENCE
(2019)
Article
Environmental Sciences
M. M. Thwala, L. N. Dlamini
ENVIRONMENTAL TECHNOLOGY
(2020)
Article
Environmental Sciences
D. N. Majotena, L. C. Mahlalela, D. M. Andala, L. N. Dlamini
WATER AIR AND SOIL POLLUTION
(2019)
Article
Multidisciplinary Sciences
PhilaniVusumuzi Hlophe, Lwazi Charles Mahlalela, Langelihle Nsikayezwe Dlamini
SCIENTIFIC REPORTS
(2019)
Article
Environmental Sciences
K. M. Shaku, L. N. Dlamini, S. P. Malinga
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2020)
Article
Engineering, Environmental
Lwazi Charles Mahlalela, Cintia Casado, Javier Marugan, Santiago Septien, Thabile Ndlovu, Langelihle Nsikayezwe Dlamini
Summary: Research has found that combining biological and photocatalytic processes for treating pesticides in aqueous solution can effectively degrade atrazine, but the removal of tebuthiuron is not significant.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Chemistry, Physical
Philani V. Hlophe, Langelihle N. Dlamini
Summary: Metal-organic frameworks (MOFs) show promise for removing and degrading pesticides in water. By combining them with black phosphorus (BP), an excellent charge carrier 2D material, a nanocomposite called BpMIL was created for visible-light-driven pesticide degradation. Optimizing conditions led to the 4%BpMIL composite achieving 96% removal of diazinon in water, outperforming MIL-125(Ti) significantly.
Article
Chemistry, Physical
Ipoteng Justice Mphahlele, Soraya Phumzile Malinga, Langelihle Nsikayezwe Dlamini
Summary: In this study, modified transition metal dichalcogenides were used to biologically and photocatalytically degrade the organic pollutant dibutyl phthalate in wastewater. The optimized parameters and the combination of biological and photocatalytic systems significantly improved the removal efficiency of dibutyl phthalate.
Article
Environmental Sciences
Majahekupheleni Livileyise Malati, Lwazi Charles Mahlalela, Soraya Phumzile Malinga, Langelihle Nsikayezwe Dlamini
Summary: The fate and behavior of transition metal dichalcogenides (TMDCs), which may be released into the environment, were investigated in this study. MoS2 nanosheets were used as a mimic for TMDCs and their stability in different electrolyte solutions and the influence of macromolecules were studied. The results showed that the agglomeration and stability of the nanosheets were affected by electrolyte type, pH, and the presence of humic acid. Furthermore, the study on the nanosheets in a wastewater treatment plant revealed that a majority of the nanosheets were retained in the sludge without affecting the plant's functionality.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH
(2022)
Article
Engineering, Environmental
Lwazi Charles Mahlalela, Cintia Casado, Javier Marugan, Santiago Septien, Thabile Ndlovu, Langelihle Nsikayezwe Dlamini
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2020)
Article
Chemistry, Multidisciplinary
Philani Vusumuzi Hlophe, Langelihle Nsikayezwe Dlamini