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Kandel S, Maddali S, Huang X, Nashed YSG, Jacobsen C, Allain M, Hruszkewycz SO. Imaging extended single crystal lattice distortion fields with multi-peak Bragg ptychography. OPTICS EXPRESS 2024; 32:19594-19610. [PMID: 38859091 DOI: 10.1364/oe.516729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 02/27/2024] [Indexed: 06/12/2024]
Abstract
Recent advances in phase-retrieval-based x-ray imaging methods have demonstrated the ability to reconstruct 3D distortion vector fields within a nanocrystal by using coherent diffraction information from multiple crystal Bragg reflections. However, these works do not provide a solution to the challenges encountered in imaging lattice distortions in crystals with significant defect content that result in phase wrapping. Moreover, these methods only apply to isolated crystals smaller than the x-ray illumination, and therefore cannot be used for imaging of distortions in extended crystals. We introduce multi-peak Bragg ptychography which addresses both challenges via an optimization framework that combines stochastic gradient descent and phase unwrapping methods for robust image reconstruction of lattice distortions and defects in extended crystals. Our work uses modern automatic differentiation toolsets so that the method is easy to extend to other settings and easy to implement in high-performance computers. This work is particularly timely given the broad interest in using the increased coherent flux in fourth-generation synchrotrons for innovative material research.
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Fronzi M, Amos RD, Kobayashi R, Matsumura N, Watanabe K, Morizawa RK. Evaluation of Machine Learning Interatomic Potentials for the Properties of Gold Nanoparticles. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3891. [PMID: 36364667 PMCID: PMC9655512 DOI: 10.3390/nano12213891] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2022] [Revised: 10/23/2022] [Accepted: 10/26/2022] [Indexed: 06/16/2023]
Abstract
We have investigated Machine Learning Interatomic Potentials in application to the properties of gold nanoparticles through the DeePMD package, using data generated with the ab-initio VASP program. Benchmarking was carried out on Au20 nanoclusters against ab-initio molecular dynamics simulations and show we can achieve similar accuracy with the machine learned potential at far reduced cost using LAMMPS. We have been able to reproduce structures and heat capacities of several isomeric forms. Comparison of our workflow with similar ML-IP studies is discussed and has identified areas for future improvement.
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Affiliation(s)
- Marco Fronzi
- University of Technology Sydney, Ultimo, NSW 2007, Australia
| | - Roger D. Amos
- University of Technology Sydney, Ultimo, NSW 2007, Australia
| | - Rika Kobayashi
- Australian National University, Canberra, ACT 2601, Australia
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Marcus MA. Information content of and the ability to reconstruct dichroic X-ray tomography and laminography. OPTICS EXPRESS 2022; 30:39445-39465. [PMID: 36298897 DOI: 10.1364/oe.462410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 08/28/2022] [Indexed: 06/16/2023]
Abstract
Dichroic tomography is a 3D imaging technique in which the polarization of the incident beam is used to induce contrast due to the magnetization or orientation of a sample. The aim is to reconstruct not only the optical density but the dichroism of the sample. The theory of dichroic tomographic and laminographic imaging in the parallel-beam case is discussed as well as the problem of reconstruction of the sample's optical properties. The set of projections resulting from a single tomographic/laminographic measurement is not sufficient to reconstruct the magnetic moment for magnetic circular dichroism unless additional constraints are applied or data are taken at two or more tilt angles. For linear dichroism, three polarizations at a common tilt angle are insufficient for unconstrained reconstruction. However, if one of the measurements is done at a different tilt angle than the other, or the measurements are done at a common polarization but at three distinct tilt angles, then there is enough information to reconstruct without constraints. Possible means of applying constraints are discussed. Furthermore, it is shown that for linear dichroism, the basic assumption that the absorption through a ray path is the integral of the absorption coefficient, defined on the volume of the sample, along the ray path, is not correct when dichroism or birefringence is strong. This assumption is fundamental to tomographic methods. An iterative algorithm for reconstruction of linear dichroism is demonstrated on simulated data.
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Jurkiewicz K, Kamiński M, Bródka A, Burian A. Atomistic origin of nano-silver paracrystalline structure: molecular dynamics and x-ray diffraction studies. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:375401. [PMID: 35772380 DOI: 10.1088/1361-648x/ac7d84] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 06/30/2022] [Indexed: 06/15/2023]
Abstract
Classical molecular dynamics (MD) and x-ray diffraction (XRD) have been used to establish the origin of the paracrystalline structure of silver nanoparticles at the atomic scale. Models based on the face-centred cubic structure have been computer generated and their atomic arrangements have been optimized by the MD with the embedded-atom model (EAM) potential and its modified version (MEAM). The simulation results are compared with the experimental XRD data in reciprocal and real spaces, i.e. the structure factor and the pair distribution function. The applied approach returns the structural models, defined by the Cartesian coordinates of the constituent atoms. It has been found that most of the structural features of Ag nanoparticles are better reproduced by the MEAM. The presence of vacancy defects in the structure of the Ag nanoparticles has been considered and the average concentration of vacancies is estimated to be 3 at.%. The average nearest-neighbour Ag-Ag distances and the coordination numbers are determined and compared with the values predicted for the bulk Ag, demonstrating a different degree of structural disorder on the surface and in the core, compared to the bulk crystalline counterpart. It has been shown that the paracrystalline structure of the Ag nanoparticles has origin in the surface disorder and the disorder generated by the presence of the vacancy defects. Both sources lead to network distortion that propagates proportionally to the square root of the interatomic distances.
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Affiliation(s)
- Karolina Jurkiewicz
- A. Chełkowski Institute of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pułku Piechoty 1a, 41-500 Chorzów, Poland
| | - Michał Kamiński
- Deutsches Elektronen-Synchrotron, Photon Science, Notkestraße 85, D-22607 Hamburg, Germany
| | - Aleksander Bródka
- A. Chełkowski Institute of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pułku Piechoty 1a, 41-500 Chorzów, Poland
| | - Andrzej Burian
- A. Chełkowski Institute of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland
- Silesian Center for Education and Interdisciplinary Research, 75 Pułku Piechoty 1a, 41-500 Chorzów, Poland
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Thi Huong V, Thi Ta HK, Mai NXD, Van Tran TT, Khuyen BX, Trinh KTL, Lee NY, Phan BT, Tran NHT. Development of a highly sensitive sensor chip using optical diagnostic based on functionalized plasmonically active AuNPs. NANOTECHNOLOGY 2021; 32:335505. [PMID: 33979787 DOI: 10.1088/1361-6528/ac0080] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Accepted: 05/12/2021] [Indexed: 06/12/2023]
Abstract
Measuring solution concentration plays an important role in chemical, biochemical, clinical diagnosis, environmental monitoring, and biological analyses. In this work, we develop a transmission-mode localized surface plasmon resonance sensor chip system and convenient method which is highly efficient, highly sensitive for detection sensing using multimode fiber. The plasmonically active sensor's surface AuNPs with high-density NPs were decorated onto 1 cm sensing length of various clad-free fiber in the form of homogeneous monolayer utilizing a self-assembly process for immobilization of the target molecule. The carboxyl bond is formed through a functional reaction on the sensor head. Using the significance in the refractive index difference and numerical aperture, which is caused by a variation in the concentration of measuring bovine serum albumin (BSA) protein which can be accurately measured by the output signal. The refractive index variation of the medium analyte layer can be converted to signal output power change at the He-Ne wavelength of 632.8 nm. The sensor detection limit was estimated to be 0.075 ng ml-1for BSA protein which shows high sensitivity compared to other types of label-free optical biosensors. This also leads to a possibility of finding the improvement in the sensitivity label-free biosensors. The conventional method should allow multimode fiber biosensors to become a possible replacement for conventional biosensing techniques based on fluorescence.
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Affiliation(s)
- Vu Thi Huong
- Faculty Department of Information Communication, Convergence Technology, Soongsil University, Seoul 06978, Republic of Korea
| | - Hanh Kieu Thi Ta
- Faculty of Materials Science and Technology, University of Science, HoChiMinh City, Vietnam
- Vietnam National University, HoChiMinh City, Vietnam
- Center for Innovative Materials and Architectures (INOMAR), HoChiMinh City, Vietnam
| | - Ngoc Xuan Dat Mai
- Vietnam National University, HoChiMinh City, Vietnam
- Center for Innovative Materials and Architectures (INOMAR), HoChiMinh City, Vietnam
| | - Thi Thanh Van Tran
- Faculty of Materials Science and Technology, University of Science, HoChiMinh City, Vietnam
- Vietnam National University, HoChiMinh City, Vietnam
| | - Bui Xuan Khuyen
- Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Kieu The Loan Trinh
- Department of Industrial Environmental Engineering, College of Industrial Environmental Engineering, Gachon University, Seongnam-si, Gyeonggi-do 13120, Republic of Korea
| | - Nae Yoon Lee
- Department of BioNano Technology, Gachon University, Seongnam-si, Gyeonggi-do 13120, Republic of Korea
| | - Bach Thang Phan
- Vietnam National University, HoChiMinh City, Vietnam
- Center for Innovative Materials and Architectures (INOMAR), HoChiMinh City, Vietnam
- Laboratory of Advanced Materials, University of Science, HoChiMinh City, Vietnam
| | - Nhu Hoa Thi Tran
- Faculty of Materials Science and Technology, University of Science, HoChiMinh City, Vietnam
- Vietnam National University, HoChiMinh City, Vietnam
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Karimadom BR, Kornweitz H. Mechanism of Producing Metallic Nanoparticles, with an Emphasis on Silver and Gold Nanoparticles, Using Bottom-Up Methods. Molecules 2021; 26:2968. [PMID: 34067624 PMCID: PMC8156005 DOI: 10.3390/molecules26102968] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 05/09/2021] [Accepted: 05/14/2021] [Indexed: 11/16/2022] Open
Abstract
Bottom-up nanoparticle (NP) formation is assumed to begin with the reduction of the precursor metallic ions to form zero-valent atoms. Studies in which this assumption was made are reviewed. The standard reduction potential for the formation of aqueous metallic atoms-E0(Mn+aq/M0aq)-is significantly lower than the usual standard reduction potential for reducing metallic ions Mn+ in aqueous solution to a metal in solid state. E0(Mn+aq/M0solid). E0(Mn+aq/M0aq) values are negative for many typical metals, including Ag and Au, for which E0(Mn+aq/M0solid) is positive. Therefore, many common moderate reduction agents that do not have significantly high negative reduction standard potentials (e.g., hydrogen, carbon monoxide, citrate, hydroxylamine, formaldehyde, ascorbate, squartic acid, and BH4-), and cannot reduce the metallic cations to zero-valent atoms, indicating that the mechanism of NP production should be reconsidered. Both AgNP and AuNP formations were found to be multi-step processes that begin with the formation of clusters constructed from a skeleton of M+-M+ (M = Ag or Au) bonds that is followed by the reduction of a cation M+ in the cluster to M0, to form Mn0 via the formation of NPs. The plausibility of M+-M+ formation is reviewed. Studies that suggest a revised mechanism for the formation of AgNPs and AuNPs are also reviewed.
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Affiliation(s)
| | - Haya Kornweitz
- Chemical Sciences Department, Ariel University, Ariel 4077625, Israel;
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A Brief Overview of Recent Progress in Porous Silica as Catalyst Supports. JOURNAL OF COMPOSITES SCIENCE 2021. [DOI: 10.3390/jcs5030075] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Porous silica particles have shown applications in various technological fields including their use as catalyst supports in heterogeneous catalysis. The mesoporous silica particles have ordered porosity, high surface area, and good chemical stability. These interesting structural or textural properties make porous silica an attractive material for use as catalyst supports in various heterogeneous catalysis reactions. The colloidal nature of the porous silica particles is highly useful in catalytic applications as it guarantees better mass transfer properties and uniform distribution of the various metal or metal oxide nanocatalysts in solution. The catalysts show high activity, low degree of metal leaching, and ease in recycling when supported or immobilized on porous silica-based materials. In this overview, we have pointed out the importance of porous silica as catalyst supports. A variety of chemical reactions catalyzed by different catalysts loaded or embedded in porous silica supports are studied. The latest reports from the literature about the use of porous silica-based materials as catalyst supports are listed and analyzed. The new and continued trends are discussed with examples.
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Do PQT, Huong VT, Phuong NTT, Nguyen TH, Ta HKT, Ju H, Phan TB, Phung VD, Trinh KTL, Tran NHT. The highly sensitive determination of serotonin by using gold nanoparticles (Au NPs) with a localized surface plasmon resonance (LSPR) absorption wavelength in the visible region. RSC Adv 2020; 10:30858-30869. [PMID: 35516028 PMCID: PMC9056339 DOI: 10.1039/d0ra05271j] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 08/05/2020] [Indexed: 12/14/2022] Open
Abstract
The development of improved methods for the synthesis of monodisperse gold nanoparticles (Au NPs) is of high priority because they can be used as substrates for surface-enhanced Raman scattering (SERS) applications relating to biological lipids. Herein, Au NPs have been successfully synthesized via a seed-mediated growth method. The LSPR peak is controlled via adjusting the gold nanoseed component, and different fabrication methods were studied to establish the effect of sonication time on NP size. The simple, facile, and room-temperature method is based on a conventional ultrasonic bath, which leads to ultrasonic energy effects on the size and morphology of the Au NPs. This research offers new opportunities for the production of highly monodispersed spherical Au NPs without the use of a magnetic stirrer method, as evidenced by ultraviolet-visible reflectance spectra and scanning electron microscopy (SEM) analysis. SEM images indicate that the spherical Au NP colloidal particles are stable and reliable, which paves the way for their use as a nanostructured biosensor platform that can be exploited for multiple applications, for example, in materials science, sensing, catalysis, medicine, food safety, biomedicine, etc. The highest enhancement factor that could be achieved in terms of the SERS enhancement activity of these Au NP arrays was determined using 10-9 M serotonin (5-hydroxytryptamine, 5-HT) as the Raman probe molecules.
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Affiliation(s)
- Phuong Que Tran Do
- Faculty of Materials Science and Technology, University of Science Ho Chi Minh City Viet Nam
- Vietnam National University Ho Chi Minh City Viet Nam
| | - Vu Thi Huong
- Faculty of Materials Science and Technology, University of Science Ho Chi Minh City Viet Nam
- Vietnam National University Ho Chi Minh City Viet Nam
| | - Nguyen Tran Truc Phuong
- Faculty of Materials Science and Technology, University of Science Ho Chi Minh City Viet Nam
- Vietnam National University Ho Chi Minh City Viet Nam
| | - Thi-Hiep Nguyen
- Vietnam National University Ho Chi Minh City Viet Nam
- Tissue Engineering and Regenerative Medicine Laboratory, Department of Biomedical Engineering, International University Ho Chi Minh City Viet Nam
| | - Hanh Kieu Thi Ta
- Faculty of Materials Science and Technology, University of Science Ho Chi Minh City Viet Nam
- Vietnam National University Ho Chi Minh City Viet Nam
- Center for Innovative Materials and Architectures (INOMAR) Ho Chi Minh City Viet Nam
| | - Heongkyu Ju
- Department of Nano-Physics, Gachon University Seongnam-si Gyeonggi-do 13120 Republic of Korea
| | - Thang Bach Phan
- Vietnam National University Ho Chi Minh City Viet Nam
- Center for Innovative Materials and Architectures (INOMAR) Ho Chi Minh City Viet Nam
- Laboratory of Advanced Materials, University of Science Ho Chi Minh City Viet Nam
| | - Viet-Duc Phung
- Future Materials and Devices Laboratory, Institute of Fundamental and Applied Sciences, Duy Tan University Ho Chi Minh City 700000 Viet Nam
- Faculty of Environmental and Chemical Engineering, Duy Tan University Da Nang 550000 Viet Nam
| | - Kieu The Loan Trinh
- Department of Industrial Environmental Engineering, College of Industrial Environmental Engineering, Gachon University Seongnam-si Gyeonggi-do 13120 Republic of Korea
| | - Nhu Hoa Thi Tran
- Faculty of Materials Science and Technology, University of Science Ho Chi Minh City Viet Nam
- Vietnam National University Ho Chi Minh City Viet Nam
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