Article
Environmental Sciences
Yejin Heo, Eun-Hee Lee, Seung-Woo Lee
Summary: The study demonstrated the potential advantages of using magnetic iron oxide nanoparticles for efficiently removing microplastic particles from water. Results showed that hydrophobic interactions played a key role in the formation of complexes between iron oxide and PS particles, and increasing the amount of iron oxide nanoparticles improved the adsorption performance. The ability of iron oxide particles to adsorb PS particles was inhibited by ions in environmental freshwater samples, but could be recovered through a desorption process.
Article
Environmental Sciences
Yejin Heo, Eun-Hee Lee, Seung-Woo Lee
Summary: This study evaluated the use of magnetic iron oxide nanoparticles for the removal of microplastics. The results showed that iron oxide particles were able to effectively remove microplastic particles from water and promote aggregation through hydrophobic interactions. The adsorption performance was inhibited by the presence of ions in the environmental sample, but could be improved by increasing the amount of iron oxide particles.
Article
Polymer Science
Shicong Jia, Hongwei Wang, Ruizhi Tang, Shujuan Ma, Bolin Gong, Junjie Ou
Summary: A novel and simple strategy of seed-swelling photoinitiated polymerization was proposed to synthesize Janus particles. The noncrosslinked polystyrene seed was swelled by absorbing an oil phase consisting of glycidyl methacrylate (GMA) as functional monomer, dipentaerythritol pentaacrylate (DPEPA) as crosslinker, and different organic solvents. By adjusting parameters such as the molar ratio of monomer and crosslinker, irradiation time, porogenic reagents, and aqueous phase composition, Janus particles with different shapes were obtained. This green synthesis method is fast and simple.
Article
Chemistry, Physical
Giovanni Russo, Marco Lattuada
Summary: In this work, a method combining activated swelling and control of free radical polymerization is used to successfully prepare monodisperse non-spherical polymer particles with asymmetric Janus structure. The addition of inhibitors 4-methoxyphenol (MEHQ) and O2 during the polymerization process enables the control of particle shape, resulting in a variety of shapes with excellent monodispersity and reproducibility. Furthermore, the introduction of iron oxide nanocrystals within the polymer matrix adds superparamagnetic properties to these non-spherical polymer particles.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Environmental
Bogyeong Kim, Seung-Woo Lee, Eui-Man Jung, Eun-Hee Lee
Summary: The capability of bacterial biofilms, specifically Acinetobacter sp., in removing sub-micron-sized PS microplastics through biosorption was evaluated in this study. The biosorption of 430 nm-PS microplastics onto the Acinetobacter sp. biofilm was well explained by the pseudo-second-order kinetics and Freundlich isotherm models. However, the biosorption capability of Acinetobacter sp. diminished after incubation with the 430 nm-PS microplastics in environmental freshwaters for 7 days.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Xiayi Feng, Ding Gao, Yipeng Jing, Junchao Qian, Zongqiang Cui, Juan Zhou, Xian -En Zhang, Dong Men
Summary: In this study, the intracellular pathway of micron-sized magnetic particles (M-MPs) mediated by self-assembled virus-like particles (VLPs) was investigated. The results showed that the intracellular movement of M-MPs was consistent with the virus infection pathway. This study provides experimental support for the active transport of M-MPs into other cell types, further expanding their applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Optics
Janak Bhandari, Brendan s. Brown, John a. Huffman, Gregory Hartland
Summary: Micron-sized dye-doped polymer beads were imaged using transmitted/reflected light microscopy and photothermal heterodyne imaging (PHI) measurements. The images showed distinct ring patterns attributed to diffraction effects and/or internal reflections within the beads. The ring pattern disappeared when an incoherent light source was used. In an organic medium, heat transfer changed the refractive index of the environment, resulting in a ring pattern external to the beads in the PHI images.
Article
Materials Science, Composites
Yanhong Ji, Peng Miao, Ruonan Zhang, Quan Li, Yifan Zha, Fengying Dai, Xi Du, Benqiao He, Shaoyun Fu
Summary: In this study, micro-sized flower-like silver particles (MFSPs) with long and thin petals are prepared by a novel chemical reduction method. The morphology and size of MFSPs are controlled by adjusting the reactant mass ratio and concentration. The as-prepared MFSP/epoxy composite adhesive exhibits low percolation threshold, high conductivity, and high adhesion strength at a very low silver content.
POLYMER COMPOSITES
(2022)
Article
Chemistry, Multidisciplinary
Patrick L. Higgs, Jordan L. Appleton, W. Bruce Turnbull, David A. Fulton
Summary: There is a growing interest in developing methods to wrap nano- and micron-sized biological objects within films for protection, stability, or performance enhancement. This study successfully wrapped lectin-decorated microspheres in a cross-linked polymer film by utilizing polymer chains that can undergo a structural metamorphosis triggered by polymer concentration on the particle surface. Both complementary molecular recognition and the dynamic covalent nature of the crosslinker are essential for successful wrapping. This approach may benefit nano- and micron-sized biological objects such as virus-like particles, bacteria, or mammalian cells in emerging applications by providing additional environmental protection or stabilization.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Thermodynamics
Shen Li, Jianqing Huang, Wubin Weng, Yong Qian, Xingcai Lu, Marcus Alden, Zhongshan Li
Summary: This study investigated the ignition and combustion process of single micron-sized iron particles in a hot gas flow. The results showed that the temperature of the burning particles rose rapidly and was much higher than the ambient temperature. The iron particles went through stages of heating, melting, rapid combustion, and cooling. Combustion parameters such as ignition delay time, accelerated burning time, total burning time, and second stage of combustion time increased linearly with the increase of particle size under the same oxygen concentration. Some of the iron particles became bright again after cooling.
COMBUSTION AND FLAME
(2022)
Article
Chemistry, Physical
Kata Dorbic, Marco Lattuada
Summary: This paper reviews the development of emulsion polymerization techniques and their exceptional control over the size, size distribution, and composition of polymer particles. It also covers the synthesis, functionalization, and applications of particles with protrusions and concavities. The rationalization of the various approaches used for particle preparation and the discussion of formation mechanisms are highlighted. The goal is to promote a broader use of these particles and the development of more effective synthetic protocols.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Jichuan Qiu, Yuxin Shang, Jianchang Xu, Younan Xia
Summary: The dissolution of a polymeric solid is a complex process that involves swelling and volume expansion before polymer chains can be disentangled and dissolved into a solvent. Recent studies have started to shed light on the mechanistic details involved in the formation of hollow particles through a template-directed process.
Article
Instruments & Instrumentation
Parker Allred, Eric Christie, Yixin Song, Daniel E. Austin, Shiuh-hua Wood Chiang, Aaron R. Hawkins
Summary: This paper introduces the use of charge detection mass spectrometry to measure the charge and mass of micron-sized particles simultaneously. The charge is detected by inducing charge onto cylindrical electrodes connected to a differential amplifier in a flow-through instrument. Mass is determined by accelerating the particles under an electric field. Particles ranging from 30 to 400 fg (3 to 7 μm diameter) were tested. The detector design can measure particle mass within 10% accuracy for particles up to 620 fg with total charge ranging from 500 e(-) to 56 ke(-). This charge and mass range is expected to be relevant for dust on Mars.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Physics, Fluids & Plasmas
G. Magnusson, A. Dubey, R. Kearney, G. P. Bewley, B. Mehlig
Summary: We have shown that the motion of charged water droplets in still air is influenced by hydrodynamic interactions, particle and fluid inertia, and electrostatic forces. When the droplets have opposite charges of sufficient magnitude, a stable manifold of a saddle point acts as a separator for colliding and non-colliding trajectories. Our experimental data and numerical model, which take into account gravity, particle inertia, hydrodynamic interactions, fluid inertia, and Coulomb interactions, yield consistent results. These findings indicate that the breakdown of hydrodynamics at small distances does not affect collision outcomes for highly charged droplets.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Chemistry, Multidisciplinary
Chenyang Wang, Shujuan Ma, Yinmao Wei, Junjie Ou
Summary: The study focuses on the use of cationic surfactant hexadecyl trimethyl ammonium bromide and co-surfactant octadecylamine to improve the stability of Pickering emulsions and arrange micron-sized silica particles at the toluene-water interface through electrostatic interaction. Organosilane reagents are also added to construct asymmetric hydrophilic or hydrophobic mesoporous onto the silica particles surface. The cation surfactant-assisted Pickering emulsion method is simple and effective, making it applicable for the synthesis of dual Janus silica particles for specific applications.
Review
Chemistry, Applied
Abraham van Tent, Shiva Zohrehvand, Klaas te Nijenhuis
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
(2014)
Article
Chemistry, Multidisciplinary
Emily J. Armstrong, Henry Galas, R. Stephen Wylie, Shiva Zohrehvand, Jan van Stam, Christopher H. Evans
Summary: The study shows that NFW forms an inclusion complex with β-CD, protecting its fluorescence state from water-based quenchers. Methyl viologen is an efficient quencher of NFW fluorescence, but its efficiency is significantly reduced in the presence of β-CD or NaCl.
CANADIAN JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Physical
S Zohrehvand, KT Nijenhuis
COLLOID AND POLYMER SCIENCE
(2005)
Article
Chemistry, Physical
S Zohrehvand, KT Nijenhuis
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2005)
Article
Polymer Science
S Zohrehvand
POLYMER INTERNATIONAL
(2005)
Article
Polymer Science
S Zohrehvand, CH Evans
POLYMER INTERNATIONAL
(2005)
Article
Chemistry, Physical
S Zohrehvand, R Cai, B Reuvers, KT Nijenhuis, AP de Boer
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2005)
Article
Chemistry, Physical
KT Nijenhuis, S Zohrehvand
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2005)
