Article
Optics
Tianan Yi, Wei Su, Qiang Yu, Hua Wu, Kun Guo, Haiqing Deng, Cheng Yin, Juntao Yan, Jian Wu, Bingyan Chen
Summary: This study presents a flexible SERS substrate with high sensitivity, low cost, simple processing, high yield, and good activity by modifying the flexible substrate using corona discharge technique. The modified substrate showed high sensitivity to Rhodamine 6G and exhibited a significant enhancement effect.
Article
Chemistry, Physical
Qiuyan Yu, Jiwei Chen, Dongjian Shi, Mingqing Chen
Summary: This study investigates the behavior of DNA-NP self-assembly in salt solutions and reveals the effects of electrostatic interactions, ionic concentrations, and DNA hybridization on the assembly structure and thermodynamic stability of DNA-NPs through molecular dynamics simulations. The findings provide theoretical guidance for designing DNA nanomaterials with controllable structures and properties, and they promote research progress in the fields of medical diagnosis and biosensors.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Materials Science, Multidisciplinary
Jingjing Si, Jinqiu Yu, Yu Shen, Jingjing Liang, Shuangfeng Jia, Mengqi Zeng, Lei Fu
Summary: This study achieved large-area super-ordered two-dimensional (2D) emptiness arrays in graphene for the first time through self-assembly pre-occupancy strategy. The periodicity of 2D emptiness arrays in graphene can be flexibly adjusted. The realization of 2D emptiness arrays by self-assembly pre-occupancy strategy would facilitate the rational redaction, fabrication, and research of complex 2D super-ordered structure systems and their applications in various fields.
SCIENCE CHINA-MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jeong Hun Choi, Nitee Kumari, Jung Hun Koo, Amit Kumar, Changhoon Lee, Ji Hoon Shim, Zhipeng Wang, Sang Ho Oh, In Su Lee
Summary: This study presents a facile method for the synthesis of unconventional amorphous hollow-silica nanostructures with controllable surface curvatures, symmetries, and interior architectures. The key role of transiently in situ crystallized metal coordination complexes as a template is identified for the differential silica growth that produces different nanostructures. Furthermore, crystal-like well-defined polygonal h-SiNSs can be assembled into highly ordered mesoscale materials with customizable cavities and nanospaces, which differ from conventionally assembled materials.
Article
Chemistry, Multidisciplinary
Fan Yang, Shunsheng Ye, Wenhao Dong, Di Zheng, Yifan Xia, Chenglin Yi, Jing Tao, Chang Sun, Lei Zhang, Lu Wang, QianYun Chen, Yazi Wang, Zhihong Nie
Summary: This study presents a facile laser-scanning-based method to fabricate quasi-3D patterned arrays of plasmonic nanoparticle dimers with controlled orientation. The approach is highly flexible in forming high-resolution patterns of plasmonic dimers of different sizes and shapes.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Tiantian Dai, Zanhong Deng, Xiaodong Fang, Huadong Lu, Yong He, Junqing Chang, Shimao Wang, Nengwei Zhu, Liang Li, Gang Meng
Summary: By controlling the use of shadow masks and the thickness of the copper film, the position and spacing of CuO microhemisphere nanowires can be well controlled, allowing for bridging of adjacent nanowires and benefiting highly sensitive TMA sensors and broad band photodetectors. The electrical response of 3.62 to 100 ppm TMA is comparable to state-of-the-art CuO-based sensors, suggesting promising commercial device applications of CuO nanowires through in situ assembly of RB-MNAs device arrays using common lithographic technologies.
Article
Physics, Applied
Xingchen Zhang, Yihang Guo, Guo Tian, Zhiqing Song, Chao Chen, Wenda Yang, Zhipeng Hou, Deyang Chen, Zhen Fan, Guofu Zhou, Jun-Ming Liu, Xingsen Gao
Summary: Researchers have fabricated an ordered BiFeO3 nanoisland array on a SrTiO3 substrate using a mask-assisted pulsed laser deposition method, which exhibits exotic topological domains. These center-type quad-domain structures have high stability and can be switched and recovered by applying external electric fields，providing a suitable platform for further exploration of the topological phase transition properties, new functions, and potential applications of BiFeO3 nanoislands.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Mariano D. Jimenez-Sanchez, Carlos Romero-Muniz, Pablo Pou, Ruben Perez, Jose M. Gomez-Rodriguez
Summary: The research investigates the graphene/Rh(111) surface as a template for the growth of metal nanoparticles, revealing different spatial distributions of Ir nanoparticles depending on the underlying moire periodicity. Density functional theory calculations show that the presence of distinctive chemical environments throughout the moire is crucial for the formation of ordered arrays of nanoparticles.
Article
Engineering, Chemical
Ward Van Geite, Ignaas S. M. Jimidar, Han Gardeniers, Gert Desmet
Summary: A universal and rapid dry assembly strategy is proposed to attain ordered arrays of micro- and nanoparticles. This method involves shooting agglomerated monodisperse silica, polystyrene, or PMMA powder microspheres against an impact plating and attracting them towards the pores of a silicon membrane device by applying a vacuum force. Excess particles are removed by brushing. The optimized conditions can be used to attain any desired 2-D particle arrangement on soft surfaces.
Article
Chemistry, Multidisciplinary
Sudipta Mondal, Pavel Rehak, Nandita Ghosh, Petr Kral, Ehud Gazit
Summary: This study demonstrates the formation of high persistence length one-dimensional arrays templated by self-assembling peptide fibers with asymmetrically distributed charged surfaces. The asymmetric nature of the peptide fibers allows charge-dependent deposition of nanoparticles, resulting in the formation of 1D arrays with higher persistence lengths.
Article
Nanoscience & Nanotechnology
Mustafa Gungormus
Summary: Achieving scalable and economic methods for manufacturing ordered structures of SiO2 nanoparticles is an ongoing challenge. Biomolecules, such as peptides and proteins, have been proven to be useful in the synthesis and self-assembly of inorganic nanostructures. In this study, a simple Stober-based method utilizing a silica-binding peptide (SiBP) is described, which can facilitate the synthesis and self-assembly of SiO2 nanoparticles into colloidal gels or opal-like structures.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Hidemasa Negoro, Hiroshi Sugimoto, Tatsuki Hinamoto, Minoru Fujii
Summary: A solution-based bottom-up process is developed to produce one- and two-dimensional arrays of densely packed spherical nanoparticles (NPs) of crystalline silicon (Si), which have the lowest order Mie resonance in the visible range. The arrays are formed using a template-assisted self-assembly method and transferred to an arbitrary substrate. The proper formation of Si NP arrays is demonstrated through polarization-resolved scattering spectra measurements and numerical simulations. The results show strong modification of scattering spectra due to near-field coupling of the electric dipole (ED) modes and the Kerker effect.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Physical
Yaakov Monsa, Nadav Lerner, Albert Danon, Ilana Bar
Summary: This study introduces a new scheme for pulsed laser ablation in liquid (PLAL) for convenient and efficient production of copper nanoparticles. By optimizing parameters, high efficiency synthesis of Cu NPs was achieved, providing a basis for further optimization for specific applications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Analytical
Ping Wu, Xiaojun Luo, Yihong Xu, Jingtian Zhu, Wenyu Jia, Ningning Fang, Chenxin Cai, Jun-Jie Zhu
Summary: In this study, a novel long-range SERS substrate was designed and fabricated to achieve high sensitivity detection of SARS-CoV-2 spike protein. The technique also showed clear discrimination from SARS-CoV spike protein and could be used for testing the spike protein in saliva with high sensitivity and specificity.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Ping Wu, Xiaojun Luo, Yihong Xu, Jingtian Zhu, Wenyu Jia, Ningning Fang, Chenxin Cai, Jun-Jie Zhu
Summary: This study developed a novel long-range SERS substrate to improve the detection of viral proteins by enhancing the electromagnetic field. The technique achieved low concentration detection of SARS-CoV-2 spike protein without the need for reagents, and could also be used for testing in saliva.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Stefan Luding, Kianoosh Taghizadeh, Chao Cheng, Lou Kondic
Summary: This study examines the evolution of dense granular systems in three dimensions during slow compression and decompression. It finds that the transitions in the system involve both smooth and continuous reversible events, as well as fast and discontinuous irreversible events. The analysis using persistent homology reveals that kinetic energy is correlated with the strength of rearrangements, while global mechanical measures, such as pressure, are strongly correlated with the evolution of topological measures quantifying loops in the force network. Surprisingly, some transitions are detected by persistent homology even when particle motion or rearrangement is weak or not observed at all.
Article
Engineering, Chemical
B. Gu, L. Kondic, L. J. Cummings
Summary: The study demonstrates that the variations in porosity of membrane filters, induced by changes in pore radii or random pore networks, significantly affect their performance. Additionally, network and pore size variations play a role, particularly when pore radii variations are significant.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Instruments & Instrumentation
Leo Saturday, Chris Luck, Leslie Wilson, Jason D. Fowlkes, Philip D. Rack, Nicholas J. Evans
Summary: This study presents a method to simulate the Spallation Neutron Source and characterize the thermal failure of NCD foils. A test stand with in situ diagnostics is used to track foil sublimation and thinning, and a COMSOL simulation is developed to assess potential changes to the NCD film and predict foil temperatures under different beam conditions.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2022)
Article
Chemistry, Multidisciplinary
Sumeer R. Khanna, Michael G. Stanford, Ivan V. Vlassiouk, Philip D. Rack
Summary: In this study, CuxN1-x alloy thin films were used as catalysts for graphene growth at atmospheric pressure. By adjusting the alloy composition, the growth of graphene was controlled. The results showed that graphene primarily grew as a single layer when the Cu concentration (x) was above 69 at.%.
Article
Nanoscience & Nanotechnology
John Lasseter, Philip D. Rack, Steven J. Randolph
Summary: In this study, a method for selectively depositing 3D nanostructures using photothermal transport is reported. The ability to initiate the process on sub-diffraction-limit nanoscale features is demonstrated. Thermal simulations show that the geometric shape and optical and thermal properties of the nanostructures are crucial for controlling the CVD reaction.
ACS APPLIED NANO MATERIALS
(2022)
Article
Instruments & Instrumentation
Leo Saturday, Leslie Wilson, Philip D. Rack, Nicholas J. Evans
Summary: This study compares the performance of nanocrystalline diamond stripper foils with microcrystalline alternatives under thermal load conditions. An electron beam mimic is used to evaluate their power dissipation and thermal durability, and postmortem testing is conducted to determine their physical properties.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2022)
Article
Chemistry, Multidisciplinary
Jason D. Fowlkes, Robert Winkler, Philip D. Rack, Harald Plank
Summary: This article presents an electron dose compensation strategy, called DBEA, to address the structural artifact issue caused by temperature gradient in 3D nanoprinting using focused electron beam-induced deposition. By modulating the electron dose, the deviations caused by temperature variations can be corrected, thus improving the printing accuracy.
Article
Chemistry, Multidisciplinary
John Lasseter, Philip D. D. Rack, Steven J. J. Randolph
Summary: This study demonstrates the selective growth of high-purity gold films onto nanoscale 3D architectures using the Me2Au (acac) precursor and pulsed laser pyrolytic chemical vapor deposition. The high thermal resistance of the nanoscale geometries enables selective deposition. The effects of laser irradiance, pulse width, and precursor pressure on the growth rate were explored, and feature-targeting resolutions of approximately 100 and 5 μm were achieved using diode lasers coupled to multimode (915 nm) and single mode (785 nm) fiber optics, respectively. Finite element thermal modeling was used to rationalize the experimental results.
Article
Physics, Fluids & Plasmas
Binan Gu, Lou Kondic, Linda J. Cummings
Summary: Pore-size gradients are used to enhance the performance of membrane filters by increasing filter lifetime and improving the utilization of membrane pore volume. In this study, we investigated the impact of pore-size gradients on the efficiency of a membrane filter with interconnected tubelike pores using mathematical modeling. Our results suggest that there is an optimal pore-radius gradient that maximizes filter efficiency, independent of the maximum pore length. Additionally, filters with longer characteristic pore length perform better.
PHYSICAL REVIEW FLUIDS
(2023)
Article
Education, Special
Jason D. Fowlkes, Robert Winkler, Philip D. Rack, Harald Plank
Summary: 3D nanoprinting using focused electron beam-induced deposition is susceptible to structural distortions caused by temperature gradients. In this study, an electron dose compensation strategy called the Decelerating Beam Exposure Algorithm (DBEA) is proposed to correct for nanowire bending during computer-aided design. The DBEA utilizes an analytical solution derived from 3D nanoprinting simulations to offset undesired heating effects. This compensation strategy has the potential to improve the fidelity of 3D nanoscale printing.
RESEARCH IN AUTISM SPECTRUM DISORDERS
(2023)
Article
Chemistry, Multidisciplinary
Jason D. Fowlkes, Robert Winkler, Philip D. Rack, Harald Plank
Summary: 3D nanoprinting using focused electron beam-induced deposition often results in structural artifacts caused by temperature gradients during the deposition process. Researchers have developed an electron dose compensation strategy to correct for these artifacts and improve the precision of 3D nanoprinting.
Article
Physics, Fluids & Plasmas
Rituparna Basak, Ryan Kozlowski, Luis A. Pugnaloni, M. Kramar, Joshua E. S. Socolar, C. Manuel Carlevaro, Lou Kondic
Summary: In this study, quasi-two-dimensional experiments were conducted with photoelastic particles confined to an annular region. It was found that an intruder constrained to move in a circular path halfway between the annular walls experiences stick-slip dynamics. The response of the granular medium to the driven intruder was discussed, with a focus on the evolution of the force network during sticking periods. The analysis of the force networks using topological measures based on persistence diagrams revealed identifiable slip precursors and characteristic features in the dynamics.
Article
Materials Science, Multidisciplinary
Timothy G. Lach, Chinthaka M. Silva, Yufan Zhou, Walker L. Boldman, Philip D. Rack, William J. Weber, Yanwen Zhang
Summary: This study investigates the behavior of two sets of near-equiatomic CoCrCuFeNi thin films under irradiation in different environments. The results demonstrate the influence of composition and environmental exposure on the stability of high entropy alloys under radiation, providing insights into controlling these behaviors.
NPJ MATERIALS DEGRADATION
(2022)
Article
Physics, Fluids & Plasmas
Luis A. Pugnaloni, C. Manuel Carlevaro, Ryan Kozlowski, Hu Zheng, Lou Kondic, Joshua E. S. Socolar
Summary: Experiments and simulations of an intruder dragged by a spring through a two-dimensional annulus of granular material show robust force fluctuations. A simple model predicts the relationship between the critical packing fraction and the width and diameter of the annulus, allowing for a data collapse. These findings challenge theories of mechanical failure in amorphous materials.
Article
Chemistry, Physical
Miroslav Kramar, Chao Cheng, Rituparna Basak, Lou Kondic
Summary: This article studies a granular particle system subjected to externally applied shear stress and investigates the evolution of system behavior before a slip event. The study finds that system behavior measures can be divided into two groups: global measures and time-dependent measures. The time-dependent measures show significant changes and increased fluctuations before a slip event occurs.
