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Artykuły w czasopismach na temat „Macro Porous Materials”

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Data publikacji: 7 września 2023

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1

ATALLA, N., R. PANNETON, F. C. SGARD i X. OLNY. "ACOUSTIC ABSORPTION OF MACRO-PERFORATED POROUS MATERIALS". Journal of Sound and Vibration 243, nr 4 (czerwiec 2001): 659–78. http://dx.doi.org/10.1006/jsvi.2000.3435.

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2

Solano-Umaña, Victor, i José Roberto Vega-Baudrit. "Micro, Meso and Macro Porous Materials on Medicine". Journal of Biomaterials and Nanobiotechnology 06, nr 04 (2015): 247–56. http://dx.doi.org/10.4236/jbnb.2015.64023.

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3

Zhu, Guangshan, Shilun Qiu, Feifei Gao, Dongsheng Li, Yafeng Li, Runwei Wang, Bo Gao i in. "Template­assisted self­assembly of macro–micro bifunctional porous materials". Journal of Materials Chemistry 11, nr 6 (2001): 1687–93. http://dx.doi.org/10.1039/b008801n.

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4

Yang, Xiao-Yu, Li-Hua Chen, Yu Li, Joanna Claire Rooke, Clément Sanchez i Bao-Lian Su. "Hierarchically porous materials: synthesis strategies and structure design". Chemical Society Reviews 46, nr 2 (2017): 481–558. http://dx.doi.org/10.1039/c6cs00829a.

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5

Nasir, Nurulfazielah, Ridhwan Jumaidin, Hady Efendy, Mohd Zulkefli Selamat, Goh Keat Beng i Muhammad Zulfattah Zakaria. "Preparation of Macroporous Ceramic Materials by Using Aluminium Powder as Foaming Agent". Applied Mechanics and Materials 699 (listopad 2014): 336–41. http://dx.doi.org/10.4028/www.scientific.net/amm.699.336.

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Aluminium powder was used as foaming agent in the production of macro-porous alumina ceramic. The porous ceramic material was developed by mixing an appropriate composition of cement, aluminium powder (Al), alumina (Al2O3), calcium oxide (CaO), gypsum (calcium sulphate dehydrate, CaSO4.2H2O), silica powder and deionized water. Different compositions of porous ceramic were produced at 2wt.%, 3wt.% and 4wt.% of aluminium powder. Their mechanical properties and macro-porosity structural of the porous ceramic material were analysed and compared. It is determined that the optimal properties of porous ceramic material were found at 3wt.% of aluminium powder and degraded drastically at 4wt.%. This phenomenon is due to the chemical reaction between the aluminium powder and DI water in which they form aluminium oxide that promotes the strength of the material but at the same time, more pores are created at higher reaction rate between these two fundamental materials.
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6

Ehlers, W., i S. Diebels. "Porous Media and Micro-Macro Approaches". Granular Matter 2, nr 3 (1.06.2000): 103. http://dx.doi.org/10.1007/s100350000045.

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7

David, Oana, Youri Gendel i Matthias Wessling. "Tubular macro-porous titanium membranes". Journal of Membrane Science 461 (lipiec 2014): 139–45. http://dx.doi.org/10.1016/j.memsci.2014.03.010.

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8

Pauliukevich, Yurij G., Olga Kizinievič, Yurij A. Klimash, Mikalai M. Hundzilovich i Giedrius Girskas. "POROUS PERMEABLE HIGH-ALUMINA CERAMIC MATERIALS FOR MACRO- AND MICROFILTRATION". Engineering Structures and Technologies 7, nr 3 (21.03.2016): 146–50. http://dx.doi.org/10.3846/2029882x.2015.1124028.

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Designed composition of ceramic mass for high-alumina porous permeable ceramic material for disperse micro hydro systems. The filler used alumina fraction 100–250 microns, as a binder system studied refractory clay Veselovskaya–medicalglass–gibbsite. Formation of material carried by dry pressing at a pressure 60 MPa, the temperature of synthesis was 1250–1350 °C, holding at the maximum temperature – 1 h. The processes occurring in the binder during sintering was investigated. The effect of the sintering temperature of the material, the amount of binder composition on the acid resistance, mechanical strength, porosity and permeability of open high-alumina permeable porous material was investigated. The structure and phase composition of the submissions received, the average pore diameter was 10 mm, it can be used for microfiltration of liquids and gases, the material is homogeneous at the macro level, the structure is represented by an extensive network of channels of pores. Phase composition is represented mainly corundum and mullite.
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9

Zhou, Bo, Congyang Zou i Erlin Meng. "Macro-Scale Numerical Simulation of Moisture Transmission in Zeoli-Based Moisture Conditioning Material". Revue des composites et des matériaux avancés 31, nr 1 (28.02.2021): 21–26. http://dx.doi.org/10.18280/rcma.310103.

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By random growth method, this paper constructs isotropic porous media, anisotropic-1 porous media, and anisotropic-2 porous media, which have the same porosity but different micropore morphologies, and explores how the pore morphology affects the water vapor diffusion in the pores of porous media. The results show that: the random growth method can effectively reconstruct various porous moisture conditioning materials, and control their porosity and pore morphology; the equilibrium water vapor concentration and stabilization time of water vapor diffusion can effectively demonstrate the pore connectivity of porous media and the dynamic migration features of materials in the pores; the greater the change in the equilibrium water vapor concentration, the faster the stabilization of water vapor diffusion, and the better the pore connectivity of porous media.
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10

Vila, Mercedes, Isabel Izquierdo-Barba, Alexis Bourgeois i María Vallet-Regí. "Bimodal meso/macro porous hydroxyapatite coatings". Journal of Sol-Gel Science and Technology 57, nr 1 (21.09.2010): 109–13. http://dx.doi.org/10.1007/s10971-010-2330-6.

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11

Shin, Chang-Kyo, Rahul B. Kawthekar i Geon-Joong Kim. "Application of the Bimodal Meso/Macroporous Composite Synthesized from MCM-41 Sol". Journal of Nanoscience and Nanotechnology 7, nr 11 (1.11.2007): 3876–79. http://dx.doi.org/10.1166/jnn.2007.052.

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A route to synthesize porous materials with a bimodal macro/mesoscopic pore system has been investigated in this work. Polystyrene with sub-micrometer size was used as a template in the synthesis. The resulting mesoporous silica wall replicated inversely the morphology of polystyrene template and had highly ordered three-dimensional arrays of macro pores. Large and moldable meso/macro porous silica monoliths could be obtained in centimeter scale by using monodispersed polystyrene beads and MCM-41 sol solutions. These bimodal structured porous silicates have been used as supports for asymmetric kinetic resolution of racemic epoxides to synthesize optically pure epoxide.
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12

ZENG, QIANG, NIDU JIKE, JIAHAN LIU, ZHENDI WANG i JIYANG WANG. "FRACTAL ANALYSIS OF STRESS-DEPENDENT DIFFUSIVITY OF POROUS CEMENTITIOUS MATERIALS". Fractals 28, nr 06 (wrzesień 2020): 2050117. http://dx.doi.org/10.1142/s0218348x20501170.

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The understanding of the diffusion process and mechanisms of harmful species (e.g. chlorides) in porous cementitious materials is important to control and improve the material durability under harsh environments. In this paper, fractal analysis on the pore structure of porous cementitious materials was conducted and involved in a diffusion model. Macro material geometric parameters were considered in the model to avoid the difficulties in the measurements of microscopic pore parameters. The deformations of porous cementitious materials under the uniaxial elastic loads were considered to correct the diffusion model. The stress-affected diffusivity was displayed in an elegant expression involving some macro material parameters (e.g. total porosity, elastic modulus of solid skeleton, Poisson ratio). Results show that the effective diffusivity is greatly influenced by the porosity and stress ratio. The uniaxial elastic loads decrease the pore areas but increase the lengths of the pore channels for mass diffusion, which eventually causes the decrease of the effective diffusivity. The plots of the relative diffusivity against the stress ratio follow linear forms. The developed fractal diffusion model may help better understand the diffusion process in complex porous cementitious materials under elastic loads. Going beyond this, the fractal diffusion model may provide a new tool to predict the diffusivity of porous building materials under complex mechanical and environmental loads.
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13

Levandovskiy, A. N., Alexander M. Efremov i G. Bruno. "Macro to Micro Stress and Strain Conversion in Porous Ceramics". Materials Science Forum 706-709 (styczeń 2012): 1667–72. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.1667.

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In this work, we propose an analytical model, capable of distinguishing the contribution of porosity, pore morphology and solid domain properties to the macroscopic elasticity of a porous ceramic material. A practical method is shown for the evaluation of the dense material elastic properties in porous (and microcracked) polycrystalline materials, making use of in-situ neutron diffraction experiments. By this method, axial and transverse microstrains measurements can reveal the average values for Young’s modulus and Poisson’s ratio of the dense material, as well as the value of pore morphology at known porosity. The approach has been validated on porous SiC. Finite Element Modeling is shown to allow calculating the three-dimensional strain and stress state under applied uniaxial stress, highlighting that small but finite shear stresses arise. Stress-strain curves of porous and microcracked materials have been generated, which correlate qualitatively well with the measured properties and can be used for quantitative numerical simulation of the materials strength. Predictions of FEM coincide very well with analytical calculations, thus corroborating the validity of the analytical method proposed.
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14

Dukhan, Nihad, Yu-chen Karen Chen-Wiegart, Ashley Paz y. Puente, Dinc Erdeniz i David C. Dunand. "Introduction - Porous Metals: From Nano to Macro". Journal of Materials Research 35, nr 19 (14.10.2020): 2529–34. http://dx.doi.org/10.1557/jmr.2020.282.

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15

Besler, Robert, Marcel Rossetti da Silva, Jefferson J. do Rosario, Maksym Dosta, Stefan Heinrich i Rolf Janssen. "Sintering Simulation of Periodic Macro Porous Alumina". Journal of the American Ceramic Society 98, nr 11 (13.06.2015): 3496–502. http://dx.doi.org/10.1111/jace.13684.

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16

Kwon, Byung Chan, Dohyung Kang, Seung Woo Lee, No-Kuk Park, Jang Hun Lee, Sang Yeon Hwang, Myoung Jo Seo i Dong-Ha Lim. "Synthesis of Macro-Porous De-NOx Catalysts for Poly-Tetra-Fluoro-Ethylene Membrane Bag Filter". Journal of Nanoscience and Nanotechnology 21, nr 8 (1.08.2021): 4537–43. http://dx.doi.org/10.1166/jnn.2021.19439.

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This study examined the effects of the porosity of catalytic bag-filter materials for applications to the SNCR (selective noncatalytic reduction)-SCR (selective catalytic reduction) hybrid process for highly treating nitrogen Oxides (NOx) in the exhaust gas of a combustion process. A V2O5/TiO2 catalyst was dispersed in a PTFE (poly-tetra-fluoro-ethylene) used as the catalytic bag-filter material to remove particulate matter and nitrogen oxides contained in the combustion exhaust gas. Macroporous alumina was added into a V2O5/TiO2-dispersed PTFE to improve the catalytic activity of V2O5/TiO2 dispersed in the PTFE material. In this study, the textural properties and denitrification performances of the V2O5/TiO2-dispersed PTFE materials were examined according to the addition of macro-porous alumina. When the denitrification catalyst was solely dispersed in the PTFE material, the catalyst inside the PTFE backbone had low gas-solid contact efficiency owing to the low porosity of the PTFE materials, resulting in low denitrification efficiency. On the other hand, the catalytic activity of V2O5/TiO2 dispersed inside the macro-porous PTFE material was significantly enhanced by adding macro-porous alumina into the PTFE matrix. The enhanced textural properties of the macro-porous PTFE material where V2O5/TiO2 was uniformly dispersed proved the facilitated diffusion of combustion exhaust gas into the PTFE material.
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17

Huang, Y., S. G. Mogilevskaya i S. L. Crouch. "Numerical modeling of micro- and macro-behavior of viscoelastic porous materials". Computational Mechanics 41, nr 6 (7.03.2007): 797–816. http://dx.doi.org/10.1007/s00466-007-0167-9.

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18

Krummrich, Phil Daro, Patrick Schneider i Thomas Hochrainer. "Experimental Validation of RVE Based Failure Simulations of Macro-Porous Materials". PAMM 16, nr 1 (październik 2016): 365–66. http://dx.doi.org/10.1002/pamm.201610171.

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19

Li, Fang Fei, Mao Sheng Xia i Yin Shan Jiang. "Various Morphology of Hierarchical Pore-Structured Compound: MCM-41/Diatomite and its Adsorption Behavior for Methylene Blue". Advanced Materials Research 690-693 (maj 2013): 3533–40. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.3533.

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Hierarchical porous materials attract considerable attentions due to their interesting structures and superior adsorption capabilities. In this work, a novel macro- and meso-porous hierarchical material, MCM-41/diatomite, has successfully been synthesized from natural diatomite and tetraethoxysilane by basic hydrothermal method. Nitrogen adsorption/desorption isotherms, low angle XRD and SEM analysis were carried out to character the multiple porous structure and morphology of MCM-41/diatomite. The resultant compound displayed high specific surface area (862~1041 m2/g) and macro-meso-porous hierarchical structure. The morphology of MCM-41/diatomite could be various, such as worm-like, grape-like, flocky, and acaleph-like, due to different ratio between TEOS, PEG, and NaOH. Moreover, the results of adsorption experiments show that some of the resultant MCM-41/diatomite display stronger adsorption capabilities than simply mesoporous MCM-41, due to the macro-meso-porous hierarchical structure, which would further extend the application of MCM-41/diatomite as adsorbent and catalyst support.
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20

Salvini, Vânia R., Paulo R. O. Lasso, Ana P. Luz i Victor C. Pandolfelli. "Nontoxic Processing of Reliable Macro-Porous Ceramics". International Journal of Applied Ceramic Technology 13, nr 3 (6.03.2016): 522–31. http://dx.doi.org/10.1111/ijac.12521.

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21

Dukhan, Nihad, Yu-chen Karen Chen-Wiegart, Ashley Paz y. Puente, Dinc Erdeniz i David C. Dunand. "Introduction - Porous Metals: From Nano to Macro - CORRIGENDUM". Journal of Materials Research 35, nr 23-24 (14.12.2020): 3305. http://dx.doi.org/10.1557/jmr.2020.327.

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22

Volovlikova, O. V., i S. A. Gavrilov. "The electrode morphology and surface energy controlling for formation of the ethanol fuel cells based on porous silicon formed by Pd-assisted etching". Perspektivnye Materialy 7 (2023): 10–22. http://dx.doi.org/10.30791/1028-978x-2023-7-10-22.

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The evolution of macro- and mesoporous layers of porous silicon formed by Pd-assisted etching with different duration of formation and temperature of the etching solution from 25 to 75 °С, which have the property of ethanol electrooxidation, has been studied. High values of the dissolution rate of porous silicon at a temperature of 75 °С are shown, leading to a significant loss of thickness and specific surface area of the macro- and mesoporous layer, respectively. The obtained porous layers with different surface energy and surface area, show different rates of ethanol dehydrogenation and the number of dehydrogenated ethanol molecules, which allows you to control the activity of the electrode material for ethanol fuel cells.
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23

Castellazzi, Giovanni, Antonio Maria D'Altri, Stefano de Miranda, Nicolò Lo Presti, Luisa Molari i Francesco Ubertini. "On the Modelling of Salt Crystallization-Induced Damage in Layered Porous Materials". Key Engineering Materials 916 (7.04.2022): 207–13. http://dx.doi.org/10.4028/p-hbps2m.

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In this contribution, the modelling of salt crystallization-induced damage in layered porous materials (such as masonry strengthened with composites, glazed earthenware, etc.) is addressed through a staggered multiphysics method. A staggered interchange of data is pursued between a multiphase model (crystallization pressure) and a macro-scale nonlinear mechanical model (material damage). Such method is preliminary applied to layered porous materials through a simple benchmark. Accordingly, the effects of layers with different properties on the crystallized salt distribution and damage pattern are highlighted.
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24

Gao, Feng, Wen Miao Li i Ya Jun Hou. "Investigation for Mechanical Properties of Porous Materials Based on Homogenization Theory". Advanced Materials Research 1048 (październik 2014): 414–17. http://dx.doi.org/10.4028/www.scientific.net/amr.1048.414.

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This paper investigated the macro-mechanical properties of three dimension porous materials consisted of periodically arrayed base units with random pore distribution using homogenization theory. The model of base unit using random numbers was established. A finite element method of homogenization equations was derived for the three dimension periodic structures and was applied to the calculation of the equivalent elastic modulus of porous materials with various porosities.The results shows the equivalent elastic modulus of three dimension porous material has significantly negative correlation with the porosity of material (p < 0.001) and the regression equation is E=(-19.4)ρ+17.6(E=equivalent elastic modulus, ρ=porosity ) when the elastic modulus of the solid matrix is 18 Gpa.
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25

Chen, Hao, Wen Jiang Feng i Mei Yang. "Preparation and Properties of Porous Glass-Ceramics with Fly Ash". Applied Mechanics and Materials 723 (styczeń 2015): 684–89. http://dx.doi.org/10.4028/www.scientific.net/amm.723.684.

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The porous glass-ceramics, i.e. SiO2-Al2O3-CaO-ZnO-R2O, was prepared with fly ash by means of the typical powder sintering method. The properties, microstructure, and morphologies of the prepared porous glass-ceramics was analyzed by employing differential thermo-gravimetric analysis/differential thermal analysis (TGA/SDTA), x-ray diffraction (XRD), scanning electron microscopy (SEM) methods, etc.. The experimental results illustrate that, the primary crystalline phase of the system is the parawollastonite (mon ̊Clinic system), with the short columnar-or bar-like grains. Furthermore, the pores of the prepared ceramics are basically composed of macro-pores, with a diameter size of 10μm~1mm. Besides, the well-distributed macro-pores are mutual independence, without formation of macro-pore mesh. All the analysis indicates that, the prepared porous glass-ceramics, i.e. SiO2-Al2O3-CaO-ZnO-R2O, can be candidate as one of the heat insulating materials.
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26

Han, Zhuo, Zhihong Tang, Peng Li, Guangzhi Yang, Qingbin Zheng i Junhe Yang. "Ammonia solution strengthened three-dimensional macro-porous graphene aerogel". Nanoscale 5, nr 12 (2013): 5462. http://dx.doi.org/10.1039/c3nr00971h.

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Jiang, Changyong, i Lixi Huang. "Realization of equivalent gradience of porous materials with periodic macro void structure". Mechanical Systems and Signal Processing 136 (luty 2020): 106434. http://dx.doi.org/10.1016/j.ymssp.2019.106434.

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Li, Yunfeng, Zhiqiang Sun, Junhu Zhang, Kai Zhang, Yanfang Wang, Zhanhua Wang, Xiaolu Chen, Shoujun Zhu i Bai Yang. "Polystyrene@TiO2 core–shell microsphere colloidal crystals and nonspherical macro-porous materials". Journal of Colloid and Interface Science 325, nr 2 (wrzesień 2008): 567–72. http://dx.doi.org/10.1016/j.jcis.2008.06.019.

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29

Zainudin, Siti Rohani, S. A. Syed Nuzul Fadzli, Dewi Suriyani Che Halin, Mohd Reusmaazran Yusof, Johar Banjuraizah i Firuz Zainuddin. "Preparation and Characterization of Macro Porous Glass-Ceramics as Bioactive Scaffold Material". Solid State Phenomena 280 (sierpień 2018): 83–89. http://dx.doi.org/10.4028/www.scientific.net/ssp.280.83.

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Bioactive glass and glass-ceramics have a huge interest in biomedical application due to their high biocompatibility and bioactive property. In this study, macro porous glass-ceramic based on 51.26% SiO2 - 36.56% CaO - 11.83% P2O5 and 42.11% SiO2 - 18.42% CaO - 29.82% Na2O - 9.65% P2O5 (in mol%) were prepared via sol-gel synthesis and powder sintering method. Sodium nitrate was used as the precursor for sodium oxide (Na2O) composition in the sol-gel glass. Effect of sodium nitrate addition on the sintered glass (glass-ceramic) properties were studied. The stabilized gel-glasses obtained were compacted into pellets and sintered at 1000 °C for 3 hours. It was found that, Na-contained glass-ceramic (Na-GC) crystallized at 71.5% due to increase in sodium-related crystalline phases. Na-GC showed 72.98% of apparent porosity and densified at 27.02% with macro porous structure with pore sizes in the range of 22.4 μm to 302 μm. The macro porous structure of Na-GC was obtained due to the foaming effect occurred during sintering. Flux effect occurred during sintering also resulted in relatively high compressive strength of Na-GC at 21.53 MPa. The macro porous Na-GC also proved to be bioactive as apatite-like structures were deposited on its surface after immersed into SBF solution for 14 days. The prepared macro porous Na-GC has high potential to be used as a scaffold material in biomedical application due to combination of suitable macro-pore size range, bioactive and has sufficient mechanical strength.
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30

Zhang, Ying Jie. "3D Modeling Based on Multiscale FE Analysis of Irregular Porous Materials". Advanced Materials Research 734-737 (sierpień 2013): 2451–55. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.2451.

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This paper presented a new multiscale finite element method for mechanical analysis of irregular porous materials. Realization of the proposed approach requires synergy between a hierarchical geometric model and a mechanical model for local material properties. The geometric model can represent intermediate scales and facilitates continuous bi-directional transition between macro-and micro-scales, while the mechanical model preserves the effective material properties for each scale.
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31

Hussain, Mazhar, Shakeel Ahmad i Wen Quan Tao. "Lattice Boltzmann Modeling of the Effective Thermal Conductivity for Complex Structured Multiphase Building Materials". Advanced Materials Research 1119 (lipiec 2015): 694–99. http://dx.doi.org/10.4028/www.scientific.net/amr.1119.694.

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The effective thermal conductivity is an important parameter used to predict the thermal performance analysis of complex structured porous building materials. The observation of porous structure of building materials on REV (representative elementary volume) scale showed that pores can be classified into meso and macro pores. In contrast to the traditional models usually used for the (macro-meso) pore connection , a new numerical random generation macro-meso pores (RGMMP) method, based on geometrical and morphological information acquired from measurements or experimental calculations, is proposed here. Along with proposed structure generating tool RGMMP a high efficiency LBM, characterized with the energy conservation and appropriate boundary conditions at numerous interfaces in the complex system, for the solution of the governing equation is described which yields a powerful numerical tool to obtain accurate solutions. Then present model is validated with some theoretical and experimental values of effective thermal conductivity of typical building materials. The comparison of present model and experimental results shows that the proposed model agrees much better with the experimental data than the traditional theoretical models. Therefore, the present model is not limited to the described building materials but can also be used for predicting the effective thermal conductivity of any type of complex structured building materials.
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32

Kim, Ju Young, Hyeong Min Jin, Seong-Jun Jeong, Taeyong Chang, Bong Hoon Kim, Seung Keun Cha, Jun Soo Kim i in. "Bimodal phase separated block copolymer/homopolymer blends self-assembly for hierarchical porous metal nanomesh electrodes". Nanoscale 10, nr 1 (2018): 100–108. http://dx.doi.org/10.1039/c7nr07178g.

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33

Sun, Yuan, Xin Liu, Chenggong Sun, Waleed Al-Sarraf, Khai Zhen Foo, Yang Meng, Stevens Lee, Wenlong Wang i Hao Liu. "Synthesis and functionalisation of spherical meso-, hybrid meso/macro- and macro-porous cellular silica foam materials with regulated pore sizes for CO2 capture". Journal of Materials Chemistry A 6, nr 46 (2018): 23587–601. http://dx.doi.org/10.1039/c8ta06224b.

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Porous cellular silica materials with nano-foamed wall structures have been developed for preparing supported polyamines for CO2 capture, with CO2 capacities reaching 5.85 mmol CO2 per g PEI-600, 6.44 mmol per g PEI-600/TEPA and 4.4 mmol per g PEI-60 000.
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34

Zaleski, Radosław, Patrycja Krasucka, Krzysztof Skrzypiec i Jacek Goworek. "Macro- and Nanoscopic Studies of Porous Polymer Swelling". Macromolecules 50, nr 13 (21.06.2017): 5080–89. http://dx.doi.org/10.1021/acs.macromol.7b00820.

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35

Zhao, Tao, Yuchi Fan, Ziqi Sun, Jianping Yang, Xiaohang Zhu, Wan Jiang, Lianjun Wang i in. "Confined interfacial micelle aggregating assembly of ordered macro–mesoporous tungsten oxides for H2S sensing". Nanoscale 12, nr 40 (2020): 20811–19. http://dx.doi.org/10.1039/d0nr06428a.

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3D hierarchically porous WO3 has been constructed through confined interfacial micelle aggregating assembly approach. Owing to unique porous structure and crystalline frameworks, the obtained material shows excellent performance for detection of H2S.
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Kavian, E., i S. H. Dibajian. "Investigating the effect of Non-uniform voids on the final strength of engineered porous materials". Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics, nr 1 (2019): 70–73. http://dx.doi.org/10.17721/1812-5409.2019/1.15.

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One way to identify porous materials is to use multi-scale analysis, and the relationships currently available for multi-scale analysis are limited to mean stress and strain values. These relationships have a great error in calculating the fracture strength of materials. It should be noted that in multi-scale methods, quantities of normal mean values are usually used to calculate macro properties, while concepts such as fracture and fatigue cannot be explained by such quantities. Since the amount of stress in different portions of porous materials is not the same, this study uses statistics and probability to better understand the stress. For this purpose, the stress histogram of the porous materials is firstly investigated. According to the obtained histogram, the probability density function was calculated for it. Finally, the effect of location uniformity and cavity size on the probability density function of porous materials is investigated.
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37

Sun, Peng, Ming Hu, Mingda Li i Shuangyun Ma. "Nano-WO3film modified macro-porous silicon (MPS) gas sensor". Journal of Semiconductors 33, nr 5 (maj 2012): 054012. http://dx.doi.org/10.1088/1674-4926/33/5/054012.

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38

Zvigintsev, M. A., S. I. Starosvetsky, M. M. Vavilova, Yu V. Doubrovina i A. M. Zvigintsev. "Advantages of Porous TiNi Materials for Dental Implants in Diabetes Mellitus Patients". KnE Materials Science 2, nr 1 (17.07.2017): 360. http://dx.doi.org/10.18502/kms.v2i1.820.

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Structural changes in osseous tissue under surgically modeled diabetes mellitus in rabbits are studied experimentally with the focus on macro- and microelemental composition. The effect of growth factors on regeneration of mucosa is analyzed in Brattlebororats with inherited diabetes insipidus. Larger animals, dogs, were used to study the morphology of osseointegration with various implant materials under experimental surgical diabetes mellitus. The advantages of porous implants over other materials are shown.
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39

Allori, Davide, Gianni Bartoli i Antonio Ferreira Miguel. "Fluid Flow through Macro-Porous Materials: Friction Coefficient and Wind Tunnel Similitude Criteria". International Journal of Fluid Mechanics Research 39, nr 2 (2012): 136–48. http://dx.doi.org/10.1615/interjfluidmechres.v39.i2.40.

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40

Towata, Atsuya, Manickam Sivakumar, Kyuichi Yasui, Toru Tuziuti, Teruyuki Kozuka, Kazutoku Ohta i Yasuo Iida. "Fabrication of bimodal (meso/macro) porous alumina materials using yeast cells as templates". e-Journal of Surface Science and Nanotechnology 3 (2005): 405–11. http://dx.doi.org/10.1380/ejssnt.2005.405.

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41

Ly, Hai Bang, Benjamin Le Droumaguet, Vincent Monchiet i Daniel Grande. "Facile fabrication of doubly porous polymeric materials with controlled nano- and macro-porosity". Polymer 78 (listopad 2015): 13–21. http://dx.doi.org/10.1016/j.polymer.2015.09.048.

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42

Nakhodchi, S., Gabrielle Hilson, David John Smith i Peter E. J. Flewitt. "A Consideration of the Measurement of Macro-Stresses in Non-Metallic Materials". Key Engineering Materials 417-418 (październik 2009): 221–24. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.221.

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In this paper the challenges associated with the determination of within section macrostresses in the non-metallic materials porous reactor core graphites, glasses and thermally grown oxides, will be considered, with respect to the length-scale over which such measurements are required. Examples are briefly presented to demonstrate the capability of the methods selected, which include deep hole drilling and photoluminescence and Raman spectroscopy. These techniques span the length-scale from micro-metres to tens of millimetres. The measured values will be discussed with respect to the confidence with which these techniques may be applied and hence benefits for life/integrity evaluation.
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43

Ovsyannikov, Sergey I., i Vladislav Yurevich Dyachenko. "Wooden Nano-Composite Materials and Prospects of their Application in Wooden Housing Construction". Materials Science Forum 931 (wrzesień 2018): 583–88. http://dx.doi.org/10.4028/www.scientific.net/msf.931.583.

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Nano-composite material is a completely new class of material that combines wood pulp and some porous materials of artificial and natural origin. This is an artificially created material consisting of a polymer matrix of the porous natural or synthetic material. The number of micro or macro-pores in the composite can be different for different wood species variety of micro and macro capillaries varying in average from 25 to 35% of the wood volume. The change in wood properties occurs at the structuring of water-insoluble molecules smaller than 3 nm and that is a part of the filler. Industrial technology of deep processing of wood-based nanotechnology allows the manufacture of new products such as laminated wood structures with nano-device that have properties not existing in nature: 1. The wood becomes hydrophobic, it is characterised by almost complete lack of absorption by the body of the wood, which leads to almost full, the lack of swelling and the change of the geometrical sizes of the material; 2. The absence of cracking. As the penetrating substance is evenly distributed between micro and macro pores and uniformly fills all the frame structure, there are additional internal stresses, typical for products made of natural wood; 3. The use of such technology ensures high 10-25% of the density if you increase strength by 20%, which also increases the seismic resistance and mi CNTI products and structures.
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44

Zou, Minmin, Hexin Zhu, Ming Dong i Tian Zhao. "Template Method for Synthesizing Hierarchically Porous MIL-101(Cr) for Efficient Removal of Large Molecular Dye". Materials 15, nr 16 (20.08.2022): 5763. http://dx.doi.org/10.3390/ma15165763.

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As one of the most important prototypical chromium-based MOFs, MIL-101(Cr) is well-studied and widely employed in various scientific fields. However, due to its small capture window sizes and curved internal apertures, its application in large molecular removal is quite limited, and given its high stability and high synthetic temperature (>200 °C), it is difficult to achieve hierarchically porous MIL-101(Cr). In our study, hierarchically porous MIL-101(Cr) involving a high macro-/meso-/micropores ratio was designed and synthesized using acetic acid as an additive and silicon dioxide (SiO2) nanoparticles as a template. The optimal hierarchically porous MIL-101(Cr) (A-4) possessed a high specific surface area (2693 m2 g−1) and an abundant macro-/mesoporous structure with the addition of SiO2 of 200 mg. Compared with the control sample (A-0) with a less macro-/mesoporous structure, A-4 showed good adsorption properties for both coomassie brilliant blue R-250 (CBB, 82.1 mg g−1) and methylene blue (MB, 34.3 mg g−1) dyes, which were 1.36 times and 9.37 times higher than those of A-0. Moreover, A-4 also had good recyclability, and the removal rate of CBB was still higher than 85% after five cycles of adsorption.
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45

Leon, Xairo, Edith Osorio, Rene Pérez-Cuapio, Carlos Bueno, Mauricio Pacio, Avelino Cortés i Hector Juárez. "Photoluminescence of Hybrid Structure Base in ZnO@SiO2 Core-Shell Nanoparticles inside Porous Silicon". Solid State Phenomena 286 (styczeń 2019): 40–48. http://dx.doi.org/10.4028/www.scientific.net/ssp.286.40.

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In this work, core-shell ZnO@SiO2nanoparticles (NPs) were infiltrated into a macro/meso-porous silicon (PS) structure, to study its luminescent properties. The core-shell ZnO@SiO2NPs were obtained by colloidal synthesis. The core-shell ZnO@SiO2NP was 5 nm in diameter. The macro/meso-PS structure was made in two steps: we obtained the macroporous silicon (macro-PS) layer fist and the mesoporous silicon (meso-PS) layer second. This process was conducted using different electrolyte solutions, and the change of electrolyte led to a decrease in the special charge region over the wall macro-PS layer; this allowed the building of the meso-PS layers on the walls and the bottom of the macro-PS layer. The SEM results show the cross-section of the macro/meso-PS structure with and without core-shell ZnO@SiO2NPs. These SEM images show that the core-shell ZnO@SiO2NPs that infiltrated into macro/meso-PS structure were more efficiently bonded over all the porous walls. The core-shell ZnO@SiO2PL interacted with the macro/meso-PS structure, modifying its PL intensity and controlling a shift toward a lower wavelength.
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46

Volovlikova, Olga, Yulia Shilyaeva, Gennady Silakov, Yulia Fedorova, Tomasz Maniecki i Sergey Gavrilov. "Tailoring porous/filament silicon using the two-step Au-assisted chemical etching of p-type silicon for forming an ethanol electro-oxidation layer". Nanotechnology 33, nr 23 (15.03.2022): 235302. http://dx.doi.org/10.1088/1361-6528/ac56f6.

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Abstract In this paper, we are reporting on the fabrication of a porous silicon/Au and silicon filament/Au using the two-step Au-assisted chemical etching of p-type Si with a specific resistivity of 0.01, 1, and 12 Ω·cm when varying the Au deposition times. The structure analysis results show that with an increasing Au deposition time of up to 7 min, the thickness of the porous Si layer increases for the same etching duration (60 min), and the morphology of the layer changes from porous to filamentary. This paper shows that the uniform macro-porous layers with a thickness of 125.5–171.2 μm and a specific surface area of the mesopore sidewalls of 142.5–182 m2·g−1 are formed on the Si with a specific resistivity of 0.01 Ω·cm. The gradient macro-porous layers with a thickness of 220–260 μm and 210–290 μm, the specific surface area of the mesopore sidewalls of 3.7–21.7 m2·g−1 and 17–29 m2·g−1 are formed on the silicon with a specific resistivity of 1 and 12 Ω·cm, respectively. The por-Si/Au has excellent low-temperature electro oxidation performance with ethanol, the activity of ethanol oxidation is mainly due to the synergistic effect of the Au nanoparticles and porous Si. The formation mechanism of the uniform and gradient macro-porous layers and ethanol electro-oxidation on the porous/filament silicon, decorated with Au nanoparticles, was established. The por-Si/Au structures with perpendicularly oriented pores, a high por-Si layer thickness, and a low mono-Si layer thickness (with a specific resistivity of 1 Ω·cm) are optimal for an effective ethanol electro-oxidation, which has been confirmed with chronoamperometry measurements.
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47

Yang, Xule, Youwei Hao i Liqin Cao. "Bio-Compatible Ca-BDC/Polymer Monolithic Composites Templated from Bio-Active Ca-BDC Co-Stabilized CO2-in-Water High Internal Phase Emulsions". Polymers 12, nr 4 (17.04.2020): 931. http://dx.doi.org/10.3390/polym12040931.

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Because of the nontoxic solvents contained in CO2-in-water emulsions, porous polymer composites templated from these emulsions are conducive for bio-applications. Herein, bio-active rod-like calcium-organic framworks (Ca-BDC MOFs, BDC= 1,4-benzenedicarboxylate anion) particles co-stabilized CO2-in-water high internal phase emulsion (C/W HIPE) in the presence of polyvinyl alcohol (PVA) is first presented. After curing of the continuous phase, followed by releasing CO2, integral 3D macro-porous Ca-BDC monolith and Ca-BDC/Poly(2-hydroxyethyl methacrylate-co-acrylamide) HIPEs monolithic composites [Ca-BDC/P(AM-co-HEMA)HIPEs] with open-cell macro-porous structures were successfully prepared. The pore structure of these porous composite can be tuned by means of tailoring the Ca-BDC dosage, carbon dioxide pressure, and continuous phase volume fractions in corresponding C/W HIPEs. Results of bio-compatibility tests show that these Ca-BDC/P(AM-co-HEMA)HIPEs monoliths have non-cytotoxicity on HepG2 cells; also, the E. coli can grow either on the surfaces or inside these monoliths. Furthermore, immobilization of β-amylase on these porous composite presents that β-amylase can be well-anchored into the porous polymer composites, its catalytic activity can be maintained even after 10 cycles. This work combined bio-active MOFs Ca-BDC, bio-compatible open-cell macroporous polymer PAM-co-HEMA and green C/W HIPEs to present a novel and facile way to prepare interconnected macro-porous MOFs/polymer composites. Compared with the existing other well-known materials such as hydrogels, these porous composites possess well-defined tunable pore structures and superior bio-activity, thereby have promising applications in bio-tissue engineering, food, and pharmaceutical.
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Chen, Ai Bing, Yun Hong Yu, Yi Feng Yu, Hai Jun Lv, Ting Ting Xing, Yue Tong Li i Wen Wei Zang. "Monolithic Macroporous-Mesoporous Carbon Using Ionic Liquids as Carbon Source". Advanced Materials Research 988 (lipiec 2014): 23–26. http://dx.doi.org/10.4028/www.scientific.net/amr.988.23.

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A facile approach is employed for the preparation of hierarchically porous structures monolithic ordered macroporous-mesoporous silica materials (OMS) using the commercially available and cheap polyurethane (PU) foam as monolithic template, triblock copolymer P123 (EO20PO70EO20) as structure-directing agent and tetraethyl orthosilicate (TEOS) as silica source, then monolithic ordered macro porous-mesoporous carbon materials (OMC) is synthesized by using monolithic ordered macroporous-mesoporous silica materials as hard template and ionic liquids as the carbon source. The silica and carbon monoliths possess uniform pore sizes (3.74-3.84 nm) and ordered mesostructure.
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49

Bulakh, B., N. Korsunska, L. Khomenkova, T. Stara, Ye Venger, T. Kryshtab i A. Kryvko. "Structural and luminescent characteristics of macro porous silicon". Journal of Materials Science: Materials in Electronics 20, S1 (20.01.2008): 226–29. http://dx.doi.org/10.1007/s10854-007-9550-8.

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Du, Lilong, Wen Li, Zhuyan Jiang, Lianyong Wang, Deling Kong, Baoshan Xu i Meifeng Zhu. "Hierarchical macro/micro-porous silk fibroin scaffolds for tissue engineering". Materials Letters 236 (luty 2019): 1–4. http://dx.doi.org/10.1016/j.matlet.2018.10.040.

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