Article
Physics, Applied
Lisha Luo, Zhibin Yan, Minqi Yang, Hongjie Yin, Haiyang Fu, Mingliang Jin, Huicheng Feng, Guofu Zhou, Lingling Shui
Summary: The effects of ionic surfactants on colloidal particle assembly process were studied, revealing that different aggregate structures form in different concentration ranges, and the interparticle separation distance within the aggregate can be regulated by increasing surfactant concentration.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Sebastian Rieger, Tim Fuermann, Jacek K. Stolarczyk, Jochen Feldmann
Summary: The study explores the potential of bismuth oxyiodide (BiOI) as a material for photocatalysis, highlighting coherent phonons induced by femtosecond laser pulse excitation. It identifies the presence of an electric field in BiOI along the [001] axis and its role in efficient charge separation, crucial for photocatalytic applications. Additionally, the research reveals two major dephasing mechanisms causing the loss of vibronic coherence in BiOI.
Article
Chemistry, Multidisciplinary
Shitao Shen, Xiaofeng Qin, Haoqiang Feng, Shuting Xie, Zichuan Yi, Mingliang Jin, Guofu Zhou, Eser Metin Akinoglu, Paul Mulvaney, Lingling Shui
Summary: In this paper, an electromicrofluidic assembly platform (eMAP) is proposed and validated for achieving 3D colloidal assembly within water droplets. By using dielectrophoresis and (di)electrowetting effects, reconfigurable colloidal configurations can be observed and dynamically programmed. This platform allows designable chemical and physical anisotropies for functional materials and devices, and enables high throughput mass production of microcapsules and optoelectronic units.
Article
Chemistry, Multidisciplinary
Anna Sinelnikova, Thomas Mandl, Christofer Ostlin, Oscar Granas, Maxim N. Brodmerkel, Erik G. Marklund, Carl Caleman
Summary: Proteins' dynamics are crucial for their function, but current techniques have limitations in monitoring high-resolution time-resolved dynamics. Combining electric fields with existing techniques may open up a new era for studying gas-phase protein dynamics.
Article
Multidisciplinary Sciences
Changjiang Liu, Yongming Luo, Deshun Hong, Steven S-L Zhang, Hilal Saglam, Yi Li, Yulin Lin, Brandon Fisher, John E. Pearson, J. Samuel Jiang, Hua Zhou, Jianguo Wen, Axel Hoffmann, Anand Bhattacharya
Summary: This study demonstrates electric field control of magnon spin currents in antiferromagnetic insulator Cr2O3. By applying an electric field across the thickness of the film, a spin-flop transition can be turned on or off, leading to polarization switching of magnon spin currents.
Article
Multidisciplinary Sciences
Jostine Puthenveetil Joby, Suman Das, Praveenkumar Pinapati, Benoit Rogez, Guillaume Baffou, Dhermendra K. Tiwari, Sudhir Cherukulappurath
Summary: Optically-assisted large-scale assembly of nanoparticles has gained recent attention for its potential in assembling and manipulating colloidal particles and biological entities. This work presents an alternative method using graphene oxide's excellent photothermal properties to achieve non-equilibrium transport and assembly of matter. Experimental results demonstrate the rapid aggregation of silica beads using low-intensity laser illumination, attributed to optically driven thermophoretic forces.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Weibin Li, Chen Zhang, Ding Lan, Wenjie Ji, Zhongyu Zheng, Yuren Wang
Summary: In this work, an ultrafast, robust, and scalable approach of imbibition-induced assembly is introduced, which enables rapid self-assembly of colloidal particles into ordered structures through instantaneous solvent imbibition induced by nanoporous media. Experimental observations show that the nanoporous substrate can induce strong capillary flow and direct the rapid self-assembly of particles, and the imbibition-induced assembly combined with meniscus-guided printing significantly improves the printing speed. The study successfully demonstrates an effective and ultrafast approach for assembling colloidal particles into photonic crystals with controllable sizes and shapes on the macroscale.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Yue Wu, Yanqiong Yang, Yan Zhang, Liwei Dai, Wenhao Dong, Huibin He, Hao Li, Zhihong Nie, Yutao Sang
Summary: This study demonstrates a photo-induced self-assembly process of binary nanoparticles with complementary copolymer ligands, leading to the formation of high-yield clusters or linear structures of colloidal molecules. By varying the irradiation duration and mixing order, precise control of different structures can be achieved, offering various applications.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Lucila Navarro, Andreas F. Thunemann, Tadahiro Yokosawa, Erdmann Spiecker, Daniel Klinger
Summary: Existing methods often address particle features individually, while our approach transfers the concept of seeded polymerization to phase separated BCP particles, allowing simultaneous control of particle shape and chemical functionality, leading to the preparation of multifunctional BCP colloids.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Mohit Singh, Yoav Tsori
Summary: In this study, the orientation transitions of uncharged peanut-shaped polystyrene colloids under different electric field conditions were investigated experimentally and theoretically. The results show that the colloids exhibit different orientation states depending on the applied potential and electric field frequency.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Physical
Maksym Karpets, Michal Rajnak, Viktor Petrenko, Igor Gapon, Mikhail Avdeev, Leonid Bulavin, Milan Timko, Peter Kopcansky
Summary: By applying an out-of-plane electric field, the assembly of magnetic nanoparticles on a metal electrode surface was observed, with changes in the interface structure and formation of a more saturated second adsorption layer with increasing electric field strength.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Polymer Science
Li Yao, Kimmy Tran, Diana Nguyen
Summary: Glioma cells produce an increased amount of collagen, which affects the invasion ability of tumor cells. This study tested the migration of glioma cells, fetal astrocytes, and adult astrocytes in a 3D collagen matrix with different collagen concentrations, and found higher motility in a low concentration of collagen hydrogel. It was also discovered that glioma cells responded to direct current electric field stimulation and migrated to the anodal pole.
Article
Optics
Pieter Geiregat, Carmelita Roda, Ivo Tanghe, Shalini Singh, Alessio Di Giacomo, Delphine Lebrun, Gianluca Grimaldi, Jorick Maes, Dries Van Thourhout, Iwan Moreels, Arjan J. Houtepen, Zeger Hens
Summary: In this study, the researchers analyzed the oscillator strength of exciton transitions in 2D CdSe nanoplatelets using the optically induced Stark effect. They found that the actual oscillator strengths were 50 times smaller than expected based on linear absorption coefficients, suggesting that the exciton absorption line is a sum of low oscillator strength transitions. The authors propose that this discrepancy is due to strong exciton center-of-mass localization and suggest that thermal effects may contribute to exciton localization.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Chemistry, Physical
Hao-Tian Guo, San-Dong Guo, Yee Sin Ang
Summary: This study proposes a new mechanism that can achieve half-metallicity in 2D ferromagnetic materials by electric field tuning. Through calculations, it is found that the CrSBr monolayer can achieve half-metallic properties within an appropriate electric field range. Additionally, a possible memory device based on the CrSBr monolayer is proposed.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Review
Chemistry, Multidisciplinary
Baoying Dai, Jiahao Guo, Chenchen Gao, Hang Yin, Yannan Xie, Zhiqun Lin
Summary: Significant progress has been made in enhancing photocatalytic performance through modulation of electric and magnetic fields. The research directions of electric field modulation, magnetic field manipulation, and reactive phase control have received increasing attention. This review examines recent advances in each of these areas, discusses specific examples and mechanisms, and presents challenges and potential opportunities for further improving photocatalytic efficiency.
ADVANCED MATERIALS
(2023)
Article
Biophysics
Juhwan Park, Kyoung G. Lee, Dong Hyun Han, Ji-Soo Lee, Seok Jae Lee, Je-Kyun Park
Summary: The study introduces a portable microfluidic device, PAMD, for generating and dispensing droplets for ddPCR with a simple pushbutton operation. PAMD can control multiple droplet generation units simultaneously with a single pushbutton, and the size of droplets can be adjusted by changing the geometry of the droplet generation channel.
BIOSENSORS & BIOELECTRONICS
(2021)
Article
Chemistry, Analytical
Yoo Min Park, Juhwan Park, Sun Young Lim, Yeji Kwon, Nam Ho Bae, Je-Kyun Park, Seok Jae Lee
Summary: The study developed a simple single-chip pathogen analysis system by integrating different modules for gene amplification, electrochemical analysis, and sample migration and mixing without external pumping systems. The system successfully detected target pathogens in laboratory conditions, demonstrating practicality and sensitivity.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Biochemical Research Methods
Juhwan Park, Je-Kyun Park
Summary: This Perspective discusses the advantages and limitations of microfluidic technologies in sample preparation, focusing on the potential and future development of pushbutton-activated microfluidic technologies as user-friendly sample preparation tools. It briefly reviews the working principle and recent advances in pushbutton-activated microfluidic technologies, and discusses future prospects for wide application in terms of integration with the signal analysis system, user-dependent variation, and universal and facile use.
Article
Engineering, Biomedical
Gihyun Lee, Soo Jee Kim, Honggu Chun, Je-Kyun Park
Summary: Microextrusion bioprinting has developed a multiple-bioink printing system by integrating a multibarrel nozzle for extruding multiple bioinks with a nebulizer for simultaneous crosslinking. This innovative system allows continuous extrusion of various biomaterials while stabilizing the printed constructs through aerosol-based crosslinking, improving printing resolution and stability in creating complex tissues with compartmentalized regions.
Article
Biochemical Research Methods
Ariel J. Lee, DongJo Yoon, SeungYun Han, Herve Hugonnet, WeiSun Park, Je-Kyun Park, YoonKey Nam, YongKeun Park
Summary: This study proposes a label-free monitoring method for 3D neuronal growth based on refractive index tomograms obtained by optical diffraction tomography, allowing clear visualization of the 3D morphology of neurons and analysis of neurite outgrowth processes in 3D spaces for individual neurons.
BIOMEDICAL OPTICS EXPRESS
(2021)
Article
Chemistry, Analytical
Minkyung Cho, Je-Kyun Park
Summary: The study presents a modular multichannel system that mimics the stenosis and inflammation processes in arteries and studies the physical and chemical effects on biomimetic artery models. Through modularization, the system enables reproducible and stable operations, with the flexibility to replace modules for different analytical purposes. This system has the potential to be utilized for comprehensive research on vascular diseases such as atherosclerosis and thrombosis through tunable channel geometry and microfluidic interfacing.
Article
Materials Science, Multidisciplinary
Soo Jee Kim, Gihyun Lee, Je-Kyun Park
Summary: This study proposes a novel bioprinting technique using a supportive microstructured bioprinting substrate to enhance the structural fidelity of low-viscosity hydrogel constructs and replicate the biological vessel formation process. This technology could be applied to developing complex constructs using cytocompatible natural hydrogels.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Biophysics
Jieun Han, Hye Jin Lim, Juhwan Park, Dong Hyun Han, Dong-Myung Kim, Je-Kyun Park
Summary: A dual sensing microfluidic device has been developed for fast, portable, and quantitative analysis of target amino acids, using the biological mechanism of protein synthesis. This device enables precise quantification of amino acids within 30 min at room temperature, indicating its potential for point-of-care testing of metabolic compounds.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Dong Hyun Han, Untaek Oh, Je-Kyun Park
Summary: Three-dimensional (3D) printing is a promising technology for fabricating microstructures, but its direct use as microchannels is limited. In this study, we replicated PDMS microchannels using 3D-printed molds and found that bonding two single PDMS layers significantly increased the optical transmittance. We evaluated the applicability of the replicated PDMS devices by comparing them to conventional Si-wafer molds and performed droplet generation in the PDMS microchannels. This study provides a fundamental understanding of prototyping microstructures from DLP-based 3D-printed molds.
Article
Nanoscience & Nanotechnology
Soo Jee Kim, Gihyun Lee, Je-Kyun Park
Summary: In this study, a novel approach for the hybrid biofabrication of complex and heterogeneous 3D constructs using low-viscosity bioinks is proposed. The approach involves the use of a micromesh substrate onto which PLA filament is extruded followed by the printing of fibrinogen. The micromesh supports the printed hydrogel with a capillary pinning effect, enabling high-resolution bioprinting. The 3D MOSAIC platform allows the fabrication of complicated and multimaterial 3D structures and the self-organization of cells within the hydrogel.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Biochemical Research Methods
Gihyun Lee, Soo Jee Kim, Je-Kyun Park
Summary: The tumor microenvironment (TME) is crucial for the nourishment of tumors and delivery of chemotherapy drugs, but existing bioprinting and microfluidic technologies have not fully utilized the potential benefits of precise spatial control and adjustment of culture environments. This study introduces a novel integrative technology that combines a self-organized TME array bioprinted on a microfluidic chip with a vascular endothelial barrier surrounding breast cancer spheroids.
Article
Nanoscience & Nanotechnology
Soo Jee Kim, Gihyun Lee, Je-Kyun Park
Summary: In this study, a novel approach for the hybrid biofabrication of complex and heterogeneous 3D constructs using low-viscosity bioinks was proposed. The microextrusion printing of fibrinogen onto PLA-framed micromesh substrates allowed for high-resolution bioprinting. The resulting 3D constructs could support the self-organization of endothelial cells and enable cancer cell migration.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Biochemical Research Methods
Gihyun Lee, Soo Jee Kim, Je-Kyun Park
Summary: Bioprinting is a powerful biofabrication technique that mimics physiological environments and functions. A continuous multiple-material bioprinting system is described that can replicate structurally complex and biologically functional microphysiological systems such as a tumor microenvironment.
Article
Biochemical Research Methods
Hwisoo Kim, Hyewon Roh, Haseong Kim, Je-Kyun Park
Summary: Hanging drop plates and low-attachment well plates are suitable for high throughput screening of spheroids, but uniform culture is difficult. To address this issue, researchers have developed a PDMS-based chip and pillar array chip, using a droplet contact-based technique for multiple reagent changes or washings.
Article
Biochemical Research Methods
Chang Hyun Cho, Minkyung Cho, Je-Kyun Park
Summary: The study introduced a multichannel microfluidic immunohistochemistry technology for high-throughput analysis of tissue microarrays, showing great potential for molecular diagnostics.
