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Nygård K, McDonald SA, González JB, Haghighat V, Appel C, Larsson E, Ghanbari R, Viljanen M, Silva J, Malki S, Li Y, Silva V, Weninger C, Engelmann F, Jeppsson T, Felcsuti G, Rosén T, Gordeyeva K, Söderberg L, Dierks H, Zhang Y, Yao Z, Yang R, Asimakopoulou EM, Rogalinski J, Wallentin J, Villanueva-Perez P, Krüger R, Dreier T, Bech M, Liebi M, Bek M, Kádár R, Terry AE, Tarawneh H, Ilinski P, Malmqvist J, Cerenius Y. ForMAX - a beamline for multiscale and multimodal structural characterization of hierarchical materials. J Synchrotron Radiat 2024; 31:363-377. [PMID: 38386565 PMCID: PMC10914163 DOI: 10.1107/s1600577524001048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Accepted: 01/30/2024] [Indexed: 02/24/2024]
Abstract
The ForMAX beamline at the MAX IV Laboratory provides multiscale and multimodal structural characterization of hierarchical materials in the nanometre to millimetre range by combining small- and wide-angle X-ray scattering with full-field microtomography. The modular design of the beamline is optimized for easy switching between different experimental modalities. The beamline has a special focus on the development of novel fibrous materials from forest resources, but it is also well suited for studies within, for example, food science and biomedical research.
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Affiliation(s)
- K. Nygård
- MAX IV Laboratory, Lund University, Lund, Sweden
| | | | | | - V. Haghighat
- MAX IV Laboratory, Lund University, Lund, Sweden
| | - C. Appel
- MAX IV Laboratory, Lund University, Lund, Sweden
- Paul Scherrer Institut, Villigen PSI, Switzerland
| | - E. Larsson
- MAX IV Laboratory, Lund University, Lund, Sweden
- Division of Solid Mechanics, Lund University, Lund, Sweden
| | - R. Ghanbari
- MAX IV Laboratory, Lund University, Lund, Sweden
- Department of Industrial and Materials Science, Chalmers University of Technology, Gothenburg, Sweden
| | - M. Viljanen
- MAX IV Laboratory, Lund University, Lund, Sweden
| | - J. Silva
- MAX IV Laboratory, Lund University, Lund, Sweden
| | - S. Malki
- MAX IV Laboratory, Lund University, Lund, Sweden
| | - Y. Li
- MAX IV Laboratory, Lund University, Lund, Sweden
| | - V. Silva
- MAX IV Laboratory, Lund University, Lund, Sweden
| | - C. Weninger
- MAX IV Laboratory, Lund University, Lund, Sweden
| | - F. Engelmann
- MAX IV Laboratory, Lund University, Lund, Sweden
| | - T. Jeppsson
- MAX IV Laboratory, Lund University, Lund, Sweden
| | - G. Felcsuti
- MAX IV Laboratory, Lund University, Lund, Sweden
| | - T. Rosén
- Department of Fibre and Polymer Technology, Royal Institute of Technology, Stockholm, Sweden
- Wallenberg Wood Science Center (WWSC), Royal Institute of Technology, Stockholm, Sweden
| | - K. Gordeyeva
- Department of Fibre and Polymer Technology, Royal Institute of Technology, Stockholm, Sweden
| | - L. D. Söderberg
- Department of Fibre and Polymer Technology, Royal Institute of Technology, Stockholm, Sweden
- Wallenberg Wood Science Center (WWSC), Royal Institute of Technology, Stockholm, Sweden
| | - H. Dierks
- Synchrotron Radiation Research, Lund University, Lund, Sweden
| | - Y. Zhang
- Synchrotron Radiation Research, Lund University, Lund, Sweden
| | - Z. Yao
- Synchrotron Radiation Research, Lund University, Lund, Sweden
| | - R. Yang
- Synchrotron Radiation Research, Lund University, Lund, Sweden
| | | | | | - J. Wallentin
- Synchrotron Radiation Research, Lund University, Lund, Sweden
| | | | - R. Krüger
- Medical Radiation Physics, Lund University, Lund, Sweden
| | - T. Dreier
- Medical Radiation Physics, Lund University, Lund, Sweden
- Excillum AB, Kista, Sweden
| | - M. Bech
- Medical Radiation Physics, Lund University, Lund, Sweden
| | - M. Liebi
- Paul Scherrer Institut, Villigen PSI, Switzerland
- Institute of Materials, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
- Department of Physics, Chalmers University of Technology, Gothenburg, Sweden
| | - M. Bek
- Department of Industrial and Materials Science, Chalmers University of Technology, Gothenburg, Sweden
- FibRe-Centre for Lignocellulose-based Thermoplastics, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg, Sweden
| | - R. Kádár
- MAX IV Laboratory, Lund University, Lund, Sweden
- Department of Industrial and Materials Science, Chalmers University of Technology, Gothenburg, Sweden
- FibRe-Centre for Lignocellulose-based Thermoplastics, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg, Sweden
- Wallenberg Wood Science Center (WWSC), Chalmers University of Technology, Gothenburg, Sweden
| | - A. E. Terry
- MAX IV Laboratory, Lund University, Lund, Sweden
| | - H. Tarawneh
- MAX IV Laboratory, Lund University, Lund, Sweden
| | - P. Ilinski
- MAX IV Laboratory, Lund University, Lund, Sweden
| | - J. Malmqvist
- MAX IV Laboratory, Lund University, Lund, Sweden
| | - Y. Cerenius
- MAX IV Laboratory, Lund University, Lund, Sweden
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Yang K, Zhang X, Venkataraman M, Wiener J, Tan X, Zhu G, Yao J, Militky J. Sandwich Fibrous PEG Encapsulations for Thermal Energy Storage. Chemphyschem 2023; 24:e202300234. [PMID: 37428636 DOI: 10.1002/cphc.202300234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 06/30/2023] [Accepted: 07/10/2023] [Indexed: 07/12/2023]
Abstract
Phase change materials (PCMs) textiles have been developed for personal thermal management (PTM) while limited loading amount of PCMs in textiles reduced thermal buffering effect. In this work, we proposed a sandwich fibrous encapsulation to store polyethylene glycol (PEG) with PEG loading amount of 45 wt %, which consisted of polyester (PET) fabrics with hydrophobic coating as protection layers, polyurethane (PU) nanofibrous membranes as barrier layers and PEG-loaded viscose fabric as a PCM-loaded layer. The leakage was totally avoided by controlling weak interfacial adhesion between protection layer and melting PEG. The sandwich fibrous PEG encapsulations had an overall melting enthalpy value ranging from 50 J/g to 78 J/g and melting points ranging from 20 °C to 63 °C by using different PEGs. Besides, introduction of Fe microparticles in PCM-loaded layer enhanced thermal energy storage efficiency. We believe that the sandwich fibrous PEG encapsulation has a great potential in various fields.
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Affiliation(s)
- Kai Yang
- Department of Material Engineering, Faculty of Textile Engineering, Technical University of Liberec, Studentska, 1402/2, Liberec, Czech Republic
| | - Xiuling Zhang
- Department of Material Engineering, Faculty of Textile Engineering, Technical University of Liberec, Studentska, 1402/2, Liberec, Czech Republic
| | - Mohanapriya Venkataraman
- Department of Material Engineering, Faculty of Textile Engineering, Technical University of Liberec, Studentska, 1402/2, Liberec, Czech Republic
| | - Jakub Wiener
- Department of Material Engineering, Faculty of Textile Engineering, Technical University of Liberec, Studentska, 1402/2, Liberec, Czech Republic
| | - Xiaodong Tan
- Department of Material Engineering, Faculty of Textile Engineering, Technical University of Liberec, Studentska, 1402/2, Liberec, Czech Republic
| | - Guocheng Zhu
- College of Textiles and Engineering, Zhejiang Sci-tech University, No. 5, Second Avenue, Xiasha Education Park, Hangzhou City, P.R. China
- Zhejiang-Czech Joint Laboratory of Advanced Fiber Materials, Zhejiang Sci-tech University, No. 5, Second Avenue, Xiasha Education Park, Hangzhou City, P.R. China
| | - Juming Yao
- School of Materials and Engineering, Zhejiang Sci-tech University, No. 5, Second Avenue, Xiasha Education Park, Hangzhou City, P.R. China
- School of Materials Science and Chemical Engineering, Ningbo University, No. 8181, Fenghua Road, Jiangbei District, Ningbo City, P.R. China
- Zhejiang-Czech Joint Laboratory of Advanced Fiber Materials, Zhejiang Sci-tech University, No. 5, Second Avenue, Xiasha Education Park, Hangzhou City, P.R. China
| | - Jiri Militky
- Department of Material Engineering, Faculty of Textile Engineering, Technical University of Liberec, Studentska, 1402/2, Liberec, Czech Republic
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Abstract
Many materials have a network of fibers as their main structural component and are referred to as network materials. Their strength and toughness are important in both engineering and biology. In this work we consider stochastic model fiber networks without pre-existing cracks and study their rupture mechanism. These materials soften as the crosslinks or fibers fail and exhibit either brittle failure immediately after the peak stress, or a more gradual, ductile rupture in the post peak regime. We observe that ductile failure takes place at constant energy release rate defined in the absence of pre-existing cracks as the strain derivative of the specific energy released. The network parameters controlling the energy release rate are identified and discussed in relation to the Lake-Thomas theory which applies to crack growth situations. We also observe a ductile to brittle failure transition as the network becomes more affine and relate the embrittlement to the reduction of mechanical heterogeneity of the network. Further, we confirm previous reports that the network strength scales linearly with the bond strength and with the crosslink density. The present results extend the Lake-Thomas theory to networks without pre-existing cracks which fail by the gradual accumulation of distributed damage and contribute to the development of a physical picture of failure in stochastic network materials.
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Affiliation(s)
- R.C. Picu
- Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180
| | - S. Jin
- Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180
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Tindell RK, Busselle LP, Holloway JL. Magnetic fields enable precise spatial control over electrospun fiber alignment for fabricating complex gradient materials. J Biomed Mater Res A 2023; 111:778-789. [PMID: 36594559 DOI: 10.1002/jbm.a.37492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Revised: 12/14/2022] [Accepted: 12/16/2022] [Indexed: 01/04/2023]
Abstract
Musculoskeletal interfacial tissues consist of complex gradients in structure, cell phenotype, and biochemical signaling that are important for function. Designing tissue engineering strategies to mimic these types of gradients is an ongoing challenge. In particular, new fabrication techniques that enable precise spatial control over fiber alignment are needed to better mimic the structural gradients present in interfacial tissues, such as the tendon-bone interface. Here, we report a modular approach to spatially controlling fiber alignment using magnetically-assisted electrospinning. Electrospun fibers were highly aligned in the presence of a magnetic field and smoothly transitioned to randomly aligned fibers away from the magnetic field. Importantly, magnetically-assisted electrospinning allows for spatial control over fiber alignment at sub-millimeter resolution along the length of the fibrous scaffold similar to the native structural gradient present in many interfacial tissues. The versatility of this approach was further demonstrated using multiple electrospinning polymers and different magnet configurations to fabricate complex fiber alignment gradients. As expected, cells seeded onto gradient fibrous scaffolds were elongated and aligned on the aligned fibers and did not show a preferential alignment on the randomly aligned fibers. Overall, this fabrication approach represents an important step forward in creating gradient fibrous materials, where such materials are promising as tissue-engineered scaffolds for regenerating functional musculoskeletal interfacial tissues.
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Affiliation(s)
- Raymond Kevin Tindell
- Chemical Engineering, School of Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona, USA
| | - Lincoln P Busselle
- Chemical Engineering, School of Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona, USA
| | - Julianne L Holloway
- Chemical Engineering, School of Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona, USA
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Lukyanov AV, Mitkin VV, Pryer T, Sirimark P, Theofanous TG. Capillary transport in paper porous materials at low saturation levels: normal, fast or superfast? Proc Math Phys Eng Sci 2021; 476:20200488. [PMID: 33408557 DOI: 10.1098/rspa.2020.0488] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Accepted: 11/17/2020] [Indexed: 12/19/2022] Open
Abstract
The problem of capillary transport in fibrous porous materials at low levels of liquid saturation has been addressed. It has been demonstrated that the process of liquid spreading in this type of porous material at low saturation can be described macroscopically by a similar super-fast, nonlinear diffusion model to that which had been previously identified in experiments and simulations in particulate porous media. The macroscopic diffusion model has been underpinned by simulations using a microscopic network model. The theoretical results have been qualitatively compared with available experimental observations within the witness card technique using persistent liquids. The long-term evolution of the wetting spots was found to be truly universal and fully in line with the mathematical model developed. The result has important repercussions for the witness card technique used in field measurements of the dissemination of various low-volatility agents in imposing severe restrictions on collection and measurement times.
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Affiliation(s)
- Alex V Lukyanov
- School of Mathematical and Physical Sciences, University of Reading, Reading RG6 6AX, UK.,P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991, Russia
| | - Vladimir V Mitkin
- Aerospace Research Laboratory, University of Virginia, Charlottesville, VA 22903, USA
| | - Tristan Pryer
- Department of Mathematical Sciences, University of Bath, Bath BA2 7AY, UK
| | - Penpark Sirimark
- Department of Science and Mathematics, Rajamangala University of Technology Isan, Surin, Thailand
| | - Theo G Theofanous
- Department of Chemical Engineering, University of California, Santa Barbara, CA 93106, USA
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Kosiński P, Brzyski P, Suchorab Z, Łagód G. Heat Losses Caused by the Temporary Influence of Wind in Timber Frame Walls Insulated with Fibrous Materials. Materials (Basel) 2020; 13:E5514. [PMID: 33287190 DOI: 10.3390/ma13235514] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 12/01/2020] [Accepted: 12/02/2020] [Indexed: 11/16/2022]
Abstract
The paper presents the results of research concerning three fiber materials—mineral wool, hemp fiber and wood wool—as loose-fill thermal insulation materials. The analysis used the material parameters determined in previous works conducted by the authors, such as thermal conductivity and air permeability in relation to bulk density. These materials exhibit open porosity; thus, convection is an essential phenomenon in the heat transfer process. The paper aimed at conducting thermal simulations of various frame wall variants which were filled with the above-mentioned insulation materials. The simulations were performed with the Control Volume Method using the Delphin 5.8 software. The studies accounted for the effect of wind pressure and the time of its influence on a wall insulated by means of fiber material with a thickness of 150 as well as 250 mm. The simulation enabled us to obtain such data as maximal R-value reduction and time to return to equilibrium after filtration for the analyzed materials. The study proved that heat transfer in these insulations strongly depends on the bulk density, thickness of the insulation and wind pressure. The decrease in R is reduced as the density increases. This results from the decreased air permeability characterizing the material. Wind washing causes lower R reduction than air filtration in all models. The greater the thickness, the longer it takes for the models to return to the equilibrium state following air filtration (and wind washing). This period is comparable for air filtration and wind washing. Hemp fibers were characterized with the strongest susceptibility to air filtration; in the case of wood wool, it was also high, but lower than for hemp fibers, while mineral wool was characterized with the lowest.
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Abstract
Materials with a stochastic fiber network as the main structural constituent are broadly encountered in engineering and in biology. These materials are characterized by multiscale heterogeneity and hence their properties evaluated numerically or experimentally are generally dependent on the size of the sample considered. In this work we evaluate the size effect on the linear and non-linear mechanical response of three-dimensional stochastic fiber networks and determine its dependence on material parameters and on the degree of affinity of network deformation. The size effect is more pronounced in non-affine than in affine networks and decreases slowly when the model size increases. In order to eliminate this effect, models lager than can be effectively solved with current computers have to be considered. To address this issue, we propose a method that allows using relatively small models, while accurately predicting the small and large strain behaviors of the network. The method is based on the generalized boundary conditions introduced in (Glüge 2013, Computational Materials Science 79, 408-416), which are being adapted here to the requirements imposed by fibrous materials.
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Affiliation(s)
- J. Merson
- Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 Eighth St, Troy, NY 12108
| | - R.C. Picu
- Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 Eighth St, Troy, NY 12108
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Elbakian A, Sága M, Sentyakov B, Kuric I, Kopas P. Reasons for the Formation of Non-Fibrous Inclusions When Preparing Basalt Fibers by the Duplex Method. Materials (Basel) 2020; 13:E5033. [PMID: 33171653 DOI: 10.3390/ma13215033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 11/05/2020] [Accepted: 11/06/2020] [Indexed: 11/30/2022]
Abstract
Materials based on basalt fiber are widely used as thermal insulating material. These materials have a number of advantages, including their low thermal conductivity and fire resistance due to their natural composition. However, there is a significant drawback in that the material contain non-fibrous inclusions. The solution to this problem would significantly improve the working conditions of workers engaged in the production of materials from basalt fiber, as well as workers engaged in construction and installation works. In addition, the research will help to make completely new products, such as special fireproof paper and sterile medical materials. This article focuses on the reasons for the formation of non-fibrous inclusions in the production of this kind of material. The technology of producing canvases from superthin fiber in the duplex way is studied. The analysis of the production process is made. Certain technological and structural parameters of the influence on the formation of such inclusions are identified. Experiments are carried out and conclusions are drawn given formation of non-fibrous inclusions of various geometric shapes for various factors. A mathematical model of the process under consideration is built. The article draws conclusion on the application of these developments in the production cycle of creating materials based on basalt fiber.
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Yan S, Shan S, Wen J, Li J, Kang N, Wu Z, Lombardi J, Cheng HW, Wang J, Luo J, He N, Mott D, Wang L, Ge Q, Hsiao BS, Poliks M, Zhong CJ. Surface-Mediated Interconnections of Nanoparticles in Cellulosic Fibrous Materials toward 3D Sensors. Adv Mater 2020; 32:e2002171. [PMID: 32705728 DOI: 10.1002/adma.202002171] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Revised: 06/12/2020] [Indexed: 06/11/2023]
Abstract
Fibrous materials serve as an intriguing class of 3D materials to meet the growing demands for flexible, foldable, biocompatible, biodegradable, disposable, inexpensive, and wearable sensors and the rising desires for higher sensitivity, greater miniaturization, lower cost, and better wearability. The use of such materials for the creation of a fibrous sensor substrate that interfaces with a sensing film in 3D with the transducing electronics is however difficult by conventional photolithographic methods. Here, a highly effective pathway featuring surface-mediated interconnection (SMI) of metal nanoclusters (NCs) and nanoparticles (NPs) in fibrous materials at ambient conditions is demonstrated for fabricating fibrous sensor substrates or platforms. Bimodally distributed gold-copper alloy NCs and NPs are used as a model system to demonstrate the semiconductive-to-metallic conductivity transition, quantized capacitive charging, and anisotropic conductivity characteristics. Upon coupling SMI of NCs/NPs as electrically conductive microelectrodes and surface-mediated assembly (SMA) of the NCs/NPs as chemically sensitive interfaces, the resulting fibrous chemiresistors function as sensitive and selective sensors for gaseous and vaporous analytes. This new SMI-SMA strategy has significant implications for manufacturing high-performance fibrous platforms to meet the growing demands of the advanced multifunctional sensors and biosensors.
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Affiliation(s)
- Shan Yan
- Department of Chemistry, and System Science and Industrial Engineering State University of New York at Binghamton, Binghamton, NY, 13902, USA
| | - Shiyao Shan
- Department of Chemistry, and System Science and Industrial Engineering State University of New York at Binghamton, Binghamton, NY, 13902, USA
| | - Jianguo Wen
- Center for Nanoscale Materials, Nanoscience and Technology Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Jing Li
- Department of Chemistry, and System Science and Industrial Engineering State University of New York at Binghamton, Binghamton, NY, 13902, USA
| | - Ning Kang
- Department of Chemistry, and System Science and Industrial Engineering State University of New York at Binghamton, Binghamton, NY, 13902, USA
| | - Zhipeng Wu
- Department of Chemistry, and System Science and Industrial Engineering State University of New York at Binghamton, Binghamton, NY, 13902, USA
| | - Jack Lombardi
- Department of Chemistry, and System Science and Industrial Engineering State University of New York at Binghamton, Binghamton, NY, 13902, USA
| | - Han-Wen Cheng
- Department of Chemistry, and System Science and Industrial Engineering State University of New York at Binghamton, Binghamton, NY, 13902, USA
| | - Jie Wang
- Center for Nanoscale Materials, Nanoscience and Technology Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Jin Luo
- Department of Chemistry, and System Science and Industrial Engineering State University of New York at Binghamton, Binghamton, NY, 13902, USA
| | - Ning He
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Derrick Mott
- Department of Chemistry, and System Science and Industrial Engineering State University of New York at Binghamton, Binghamton, NY, 13902, USA
| | - Lichang Wang
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, IL, 62901, USA
| | - Qingfeng Ge
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, IL, 62901, USA
| | - Benjamin S Hsiao
- Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Mark Poliks
- Department of Chemistry, and System Science and Industrial Engineering State University of New York at Binghamton, Binghamton, NY, 13902, USA
| | - Chuan-Jian Zhong
- Department of Chemistry, and System Science and Industrial Engineering State University of New York at Binghamton, Binghamton, NY, 13902, USA
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Rozhdestvenskaya IV, Mugnaioli E, Schowalter M, Schmidt MU, Czank M, Depmeier W, Rosenauer A. The structure of denisovite, a fibrous nanocrystalline polytypic disordered 'very complex' silicate, studied by a synergistic multi-disciplinary approach employing methods of electron crystallography and X-ray powder diffraction. IUCrJ 2017; 4:223-242. [PMID: 28512570 PMCID: PMC5414397 DOI: 10.1107/s2052252517002585] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Accepted: 02/14/2017] [Indexed: 05/20/2023]
Abstract
Denisovite is a rare mineral occurring as aggregates of fibres typically 200-500 nm diameter. It was confirmed as a new mineral in 1984, but important facts about its chemical formula, lattice parameters, symmetry and structure have remained incompletely known since then. Recently obtained results from studies using microprobe analysis, X-ray powder diffraction (XRPD), electron crystallography, modelling and Rietveld refinement will be reported. The electron crystallography methods include transmission electron microscopy (TEM), selected-area electron diffraction (SAED), high-angle annular dark-field imaging (HAADF), high-resolution transmission electron microscopy (HRTEM), precession electron diffraction (PED) and electron diffraction tomography (EDT). A structural model of denisovite was developed from HAADF images and later completed on the basis of quasi-kinematic EDT data by ab initio structure solution using direct methods and least-squares refinement. The model was confirmed by Rietveld refinement. The lattice parameters are a = 31.024 (1), b = 19.554 (1) and c = 7.1441 (5) Å, β = 95.99 (3)°, V = 4310.1 (5) Å3 and space group P12/a1. The structure consists of three topologically distinct dreier silicate chains, viz. two xonotlite-like dreier double chains, [Si6O17]10-, and a tubular loop-branched dreier triple chain, [Si12O30]12-. The silicate chains occur between three walls of edge-sharing (Ca,Na) octahedra. The chains of silicate tetrahedra and the octahedra walls extend parallel to the z axis and form a layer parallel to (100). Water molecules and K+ cations are located at the centre of the tubular silicate chain. The latter also occupy positions close to the centres of eight-membered rings in the silicate chains. The silicate chains are geometrically constrained by neighbouring octahedra walls and present an ambiguity with respect to their z position along these walls, with displacements between neighbouring layers being either Δz = c/4 or -c/4. Such behaviour is typical for polytypic sequences and leads to disorder along [100]. In fact, the diffraction pattern does not show any sharp reflections with l odd, but continuous diffuse streaks parallel to a* instead. Only reflections with l even are sharp. The diffuse scattering is caused by (100) nano-lamellae separated by stacking faults and twin boundaries. The structure can be described according to the order-disorder (OD) theory as a stacking of layers parallel to (100).
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Affiliation(s)
- Ira V. Rozhdestvenskaya
- Department of Crystallography, Institute of Earth Science, Saint Petersburg State University, University emb. 7/9, St Petersburg 199034, Russian Federation
| | - Enrico Mugnaioli
- Department of Physical Sciences, Earth and Environment, University of Siena, Via Laterino 8, Siena 53100, Italy
- Center for Nanotechnology Innovation@NEST, Istituto Italiano di Tecnologia, Piazza San Silvestro 12, Pisa 56127, Italy
- Correspondence e-mail: ,
| | - Marco Schowalter
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, Bremen D-28359, Germany
| | - Martin U. Schmidt
- Institut für Anorganische und Analytische Chemie, Goethe-Universität, Max-von-Laue-Strasse 7, Frankfurt am Main D-60438, Germany
| | - Michael Czank
- Institute of Geosciences, Kiel University, Olshausenstrasse 40, Kiel D-24098, Germany
| | - Wulf Depmeier
- Institute of Geosciences, Kiel University, Olshausenstrasse 40, Kiel D-24098, Germany
- Correspondence e-mail: ,
| | - Andreas Rosenauer
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, Bremen D-28359, Germany
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Wu J, Li Y, He C, Kang J, Ye J, Xiao Z, Zhu J, Chen A, Feng S, Li X, Xiao J, Xian M, Wang Q. Novel H 2S Releasing Nanofibrous Coating for In Vivo Dermal Wound Regeneration. ACS Appl Mater Interfaces 2016; 8:27474-27481. [PMID: 27504858 DOI: 10.1021/acsami.6b06466] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Hydrogen sulfide (H2S), together with nitric oxide and carbon monoxide, has been recognized as an important gasotransmitter. It plays an essential physiological role in regulating cyto-protective signal process, and H2S-based therapy is considered as the next generation of promising therapeutic strategies for many biomedical applications, such as the treatment of cardiovascular disease. Through electrospinning of polycaprolactone (PCL) containing JK1, a novel pH-controllable H2S donor, nanofibers with H2S releasing function, PCL-JK1, are fabricated. This fibrous scaffold showed a pH-dependent H2S releasing behavior, i.e., lower pH induced greater and faster H2S release. In addition, the H2S release of JK1 was prolonged by the fibrous matrix as shown by decreased releasing rates compared to JK1 in solutions. In addition, in vitro studies indicated that PCL-JK1 exhibited excellent cyto-compatibility, similar to PCL fibers. Finally, we investigated PCL-JK1 as a wound dressing toward a cutaneous wound model in vivo and found that PCL-JK1 could significantly enhance the wound repair and regeneration compared with the control PCL scaffold, likely due to the release of H2S, which results in a broad range of physiologically protective functions toward the wound.
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Affiliation(s)
- Jiang Wu
- School of Pharmaceutical Sciences, Key Laboratory of Biotechnology and Pharmaceutical Engineering, Wenzhou Medical University , Wenzhou, Zhejiang 325035, China
- Department of Chemistry and Biochemistry, University of South Carolina , Columbia, South Carolina 29208, United States
| | - Yi Li
- School of Pharmaceutical Sciences, Key Laboratory of Biotechnology and Pharmaceutical Engineering, Wenzhou Medical University , Wenzhou, Zhejiang 325035, China
| | - Chaochao He
- School of Pharmaceutical Sciences, Key Laboratory of Biotechnology and Pharmaceutical Engineering, Wenzhou Medical University , Wenzhou, Zhejiang 325035, China
| | - Jianming Kang
- Department of Chemistry, Washington State University , Pullman, Washington 99164, United States
| | - Jingjing Ye
- School of Pharmaceutical Sciences, Key Laboratory of Biotechnology and Pharmaceutical Engineering, Wenzhou Medical University , Wenzhou, Zhejiang 325035, China
| | - Zecong Xiao
- School of Pharmaceutical Sciences, Key Laboratory of Biotechnology and Pharmaceutical Engineering, Wenzhou Medical University , Wenzhou, Zhejiang 325035, China
| | - Jingjing Zhu
- School of Pharmaceutical Sciences, Key Laboratory of Biotechnology and Pharmaceutical Engineering, Wenzhou Medical University , Wenzhou, Zhejiang 325035, China
| | - Anqi Chen
- School of Pharmaceutical Sciences, Key Laboratory of Biotechnology and Pharmaceutical Engineering, Wenzhou Medical University , Wenzhou, Zhejiang 325035, China
| | - Sheng Feng
- Department of Chemistry and Biochemistry, University of South Carolina , Columbia, South Carolina 29208, United States
- 486 Gallimore Dairy Rd, Greensboro, North Carolin 27409, United States
| | - Xiaokun Li
- School of Pharmaceutical Sciences, Key Laboratory of Biotechnology and Pharmaceutical Engineering, Wenzhou Medical University , Wenzhou, Zhejiang 325035, China
| | - Jian Xiao
- School of Pharmaceutical Sciences, Key Laboratory of Biotechnology and Pharmaceutical Engineering, Wenzhou Medical University , Wenzhou, Zhejiang 325035, China
| | - Ming Xian
- Department of Chemistry, Washington State University , Pullman, Washington 99164, United States
| | - Qian Wang
- Department of Chemistry and Biochemistry, University of South Carolina , Columbia, South Carolina 29208, United States
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