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Journal articles on the topic 'Permanent Porosity'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Giri, Nicola, Mario G. Del Pópolo, Gavin Melaugh, Rebecca L. Greenaway, Klaus Rätzke, Tönjes Koschine, Laure Pison, Margarida F. Costa Gomes, Andrew I. Cooper, and Stuart L. James. "Liquids with permanent porosity." Nature 527, no. 7577 (November 2015): 216–20. http://dx.doi.org/10.1038/nature16072.

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2

Jie, Kecheng, Yujuan Zhou, Hugh P. Ryan, Sheng Dai, and Jonathan R. Nitschke. "Engineering Permanent Porosity into Liquids." Advanced Materials 33, no. 18 (March 26, 2021): 2005745. http://dx.doi.org/10.1002/adma.202005745.

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3

Lerma-Berlanga, Belén, Javier Castells-Gil, Carolina R. Ganivet, Neyvis Almora-Barrios, Javier González-Platas, Oscar Fabelo, Natalia M. Padial, and Carlos Martí-Gastaldo. "Permanent Porosity in Hydroxamate Titanium–Organic Polyhedra." Journal of the American Chemical Society 143, no. 50 (December 8, 2021): 21195–99. http://dx.doi.org/10.1021/jacs.1c09278.

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4

Rose, Marcus, Winfried Böhlmann, Michal Sabo, and Stefan Kaskel. "Element–organic frameworks with high permanent porosity." Chemical Communications, no. 21 (2008): 2462. http://dx.doi.org/10.1039/b718925g.

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5

Wang, Xi-Sen, Shengqian Ma, Daofeng Sun, Sean Parkin, and Hong-Cai Zhou. "A Mesoporous Metal−Organic Framework with Permanent Porosity." Journal of the American Chemical Society 128, no. 51 (December 2006): 16474–75. http://dx.doi.org/10.1021/ja066616r.

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6

Zhang, Xuan, Zhijie Chen, Xinyao Liu, Sylvia L. Hanna, Xingjie Wang, Reza Taheri-Ledari, Ali Maleki, Peng Li, and Omar K. Farha. "A historical overview of the activation and porosity of metal–organic frameworks." Chemical Society Reviews 49, no. 20 (2020): 7406–27. http://dx.doi.org/10.1039/d0cs00997k.

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7

Hisaki, Ichiro, Chen Xin, Kiyonori Takahashi, and Takayoshi Nakamura. "Designing Hydrogen‐Bonded Organic Frameworks (HOFs) with Permanent Porosity." Angewandte Chemie International Edition 58, no. 33 (August 12, 2019): 11160–70. http://dx.doi.org/10.1002/anie.201902147.

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8

Alduhaish, Osamah, Bin Li, Vladimir Nesterov, Hadi D. Arman, Khalid Alfooty, Abdullah M. Asiri, Hailong Wang, and Banglin Chen. "Two structurally different praseodymium-organic frameworks with permanent porosity." Inorganic Chemistry Communications 45 (July 2014): 89–92. http://dx.doi.org/10.1016/j.inoche.2014.04.016.

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9

Hisaki, Ichiro, Xin Chen, Kiyonori Takahashi, and Takayoshi Nakamura. "Berichtigung: Designing Hydrogen‐Bonded Organic Frameworks (HOFs) with Permanent Porosity." Angewandte Chemie 131, no. 42 (October 7, 2019): 14938. http://dx.doi.org/10.1002/ange.201909732.

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10

Hisaki, Ichiro, Xin Chen, Kiyonori Takahashi, and Takayoshi Nakamura. "Corrigendum: Designing Hydrogen‐Bonded Organic Frameworks (HOFs) with Permanent Porosity." Angewandte Chemie International Edition 58, no. 42 (October 7, 2019): 14794. http://dx.doi.org/10.1002/anie.201909732.

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11

Elsayed, Fady Refaat, Norbert Hort, Mario Alberto Salgado Ordorica, and Karl Ulrich Kainer. "Magnesium Permanent Mold Castings Optimization." Materials Science Forum 690 (June 2011): 65–68. http://dx.doi.org/10.4028/www.scientific.net/msf.690.65.

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Permanent mold casting is a well-established route for casting large magnesium alloys components. Casting parameters like superheat, mold temperature, and holding time can often result in inhomogeneous properties, porosity, and segregation problems in the cast part. In order to optimize the casting process, control of the casting parameters including mold temperatures and holding times is essential to promote directional solidification, and ensure defect free homogenous structure. Binary Mg-9wt.%Al and Mg-10wt.%Gd alloys were used to investigate the effect of casting parameters such as melt temperature and holding time on the part macro and microstructure.

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12

Liu, Yutong, Yang Bai, and Tao Tian. "Preparation of Porous Liquid Based on Silicalite-1." Materials 12, no. 23 (December 1, 2019): 3984. http://dx.doi.org/10.3390/ma12233984.

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Solid porous materials, like zeolites, have been widely used in a variety of fields such as size-and-shape-selective absorption/separation and catalysis because of their porosity. However, there are few liquid materials that exhibit permanent porosity. Porous liquids are a novel material that combine the properties of fluidity and permanent porosity. They have potential applications in many fields such as gas separation, storage and transport. Herein, we report a novel Type 1 porous liquid prepared based on silicalite-1. The pore size of this porous liquid was determined by positron annihilation lifetime spectroscopy (PALS), and the CO2 capacities were determined by the intelligent gravimetric analyzer (IGA). The unique properties of this porous liquid can promote its application in many fields such as gas storage and transport.

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13

Zentner, Cassandra A., Holden W. H. Lai, Joshua T. Greenfield, Ren A. Wiscons, Matthias Zeller, Charles F. Campana, Orhan Talu, Stephen A. FitzGerald, and Jesse L. C. Rowsell. "High surface area and Z′ in a thermally stable 8-fold polycatenated hydrogen-bonded framework." Chemical Communications 51, no. 58 (2015): 11642–45. http://dx.doi.org/10.1039/c5cc04219d.

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14

Benecke, Jannik, Sebastian Mangelsen, Tobias A. Engesser, Thomas Weyrich, Jannik Junge, Norbert Stock, and Helge Reinsch. "A porous and redox active ferrocenedicarboxylic acid based aluminium MOF with a MIL-53 architecture." Dalton Transactions 48, no. 44 (2019): 16737–43. http://dx.doi.org/10.1039/c9dt03489g.

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15

Jie, Kecheng, Yujuan Zhou, Hugh P. Ryan, Sheng Dai, and Jonathan R. Nitschke. "Porous Liquids: Engineering Permanent Porosity into Liquids (Adv. Mater. 18/2021)." Advanced Materials 33, no. 18 (May 2021): 2170136. http://dx.doi.org/10.1002/adma.202170136.

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16

Mahdavi, Hamidreza, Huacheng Zhang, Lauren K. Macreadie, C. M. Doherty, Durga Acharya, Stefan J. D. Smith, Xavier Mulet, and Matthew R. Hill. "Underlying solvent-based factors that influence permanent porosity in porous liquids." Nano Research 15, no. 4 (November 26, 2021): 3533–38. http://dx.doi.org/10.1007/s12274-021-3862-5.

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17

Bernard, Miguel, Doru Velea, and James M. Sabatier. "Permanent removal of the wall porosity in monolithic catalyst support ceramics." Journal of the Acoustical Society of America 99, no. 4 (April 1996): 2430–32. http://dx.doi.org/10.1121/1.415432.

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18

Zhang, Zhangjing, Shengchang Xiang, Qian Zheng, Xingtang Rao, Jalal U. Mondal, Hadi D. Arman, Guodong Qian, and Banglin Chen. "A Rare Uninodal 9-Connected Metal−Organic Framework with Permanent Porosity." Crystal Growth & Design 10, no. 5 (May 5, 2010): 2372–75. http://dx.doi.org/10.1021/cg100183y.

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19

Jiang, Fu Xiang, Tie Jun Zhao, and Ming Lei Hao. "Influence of Uniaxial Tensile Cyclic Load on the Porosity of High Performance Concrete." Applied Mechanics and Materials 94-96 (September 2011): 1500–1504. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.1500.

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The total porosity of the high performance concrete under cyclic loading was measured in this present paper. Results show that finite cycles of cyclic axial tensile load causes permanent damage to concrete, which can be measured after unloading. The higher the applied upper load level or the more the cycle number is, the more obvious will be the connection and development of micro cracks. Then the higher will be the total porosity. Especially, with the increase of cyclic load number, the total porosity of the concrete shows obvious stage characteristics. And there is a linear relationship between the total porosity and cyclic loading cycles in the second developing stage of fatigue strain.

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20

Danquah, Michael K., Shan Wang, Qianyou Wang, Bo Wang, and Lee D. Wilson. "A porous β-cyclodextrin-based terpolymer fluorescence sensor for in situ trinitrophenol detection." RSC Advances 9, no. 14 (2019): 8073–80. http://dx.doi.org/10.1039/c8ra06192k.

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21

Suprapto, Wahyono, Bambang Suharno, Johny Wahyuadi Soedarsono, and Dedi Priadi. "Analytical and Experimental Models of Porosity Formation of Duralumin Cast in Vacuum Casting System." Advanced Materials Research 277 (July 2011): 76–83. http://dx.doi.org/10.4028/www.scientific.net/amr.277.76.

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Porosity in cast metals often leads to cracking of components due to stress concentration and leakage, and as the result, the castings need be repaired or rejected. Disharmony in casting process was resulting in porosity. Prediction of porosity in the casting is necessary as a step to avoid the waste products and reduce costs. But to ensure whether these predictions are accurate and precise, it is still necessary to validate the test trials and testing. This paper aims to provide early information when, where, and how large a defect occurs in particular foundry casting porosity on duralumin. The analytical study of porosity formation based analytic equilibrium wt% of element, the behavior of the thermodynamic, hydrodynamic, and rules of metallurgical on vacuum casting of duralumin. Experiments as a validation study are conducted by duralumin remelting on stainless-steel bowl in a vacuum casting furnace. Analytical simulation and experiments of the casting that has been vacuumed by melting 10 cmHg pressures higher than the pressure solidification, and duralumin melt is poured automatically into permanent mold carbon steel. In the study cast duralumin created five different thicknesses. Both these studies assume the addition of copper (2.5%, 3.0%, 3.5 %, 4.0%, and 4.5% Cu) and vacuum pressure (76, 50, 40, cmHg), as independent variables, while dependent variable in the studies is porosity characteristics, which includes morphology, number and dimensions of the porosity. Optical emission spectrometry test, Reynold's and Niyama numbers, Sievert's law, Archimedes' principle (Pycnometry and Straube-Pfeiffer tests), and Eichenauer equation are instruments which are used to determine the characterization of duralumin casting porosity. Duralumin ingots remelting process was performed by the control pressure (p1) and temperature (T1). Vacuuming process performed after the smelting room temperature reaches 600 °C. Once melted, it followed by duralumin into a permanent mold (p2, T2). As a control parameter is the height of pouring (7 cm), pour temperature and mold temperature respectively at 750 °C and 300 °C. The porosity characteristics studies of two models produce two types of porosity (gas and shrinkage), the quantity dimension and porosity, and distribution of porosity in the cast duralumin.

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22

Hyodo, Tadashi, Masahide Tominaga, and Kentaro Yamaguchi. "Guest-dependent single-crystal-to-single-crystal transformations in porous adamantane-bearing macrocycles." CrystEngComm 23, no. 7 (2021): 1539–43. http://dx.doi.org/10.1039/d0ce01782e.

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An adamantane-bearing macrocycle exhibited permanent intrinsic porosity and adsorption of small guests in single-crystal-to-single-crystal fashions. The guest capture resulted in the structural transformations of supramolecular organic frameworks.

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23

Li, Peipei, Hao Chen, Jennifer A. Schott, Bo Li, Yaping Zheng, Shannon M. Mahurin, De-en Jiang, et al. "Porous liquid zeolites: hydrogen bonding-stabilized H-ZSM-5 in branched ionic liquids." Nanoscale 11, no. 4 (2019): 1515–19. http://dx.doi.org/10.1039/c8nr07337f.

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The porous liquid zeolites with permanent porosity could be fabricated by exploiting the hydrogen bonding interaction between the alkane chains of branched ionic liquids and the Brønsted sites in H-form zeolites.

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24

Thanaya, ME., PhD, I. Nyoman Arya, I. Wayan Putra Jayantara, and I. Gusti Raka Purbanto. "Study on the properties of Permanent Cold Patching (PCP)." MEDIA KOMUNIKASI TEKNIK SIPIL 26, no. 1 (July 30, 2020): 36–43. http://dx.doi.org/10.14710/mkts.v26i1.28446.

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Patching road pothole can be done using Permanent Cold Patching (PCP). This research main aim was to analyze the characteristic of the PCP. PCP Super Cold Mix Asphalt was used for the experiment. The mixtures were compacted Marshall hummer in lab using, and plate compactor on site. It was obtained that: compaction temperature variation significantly affected the characteristic of the mixture. Compaction at 100°C and 150°C, met stability, porosity and VMA specification, but not for the VFB. It required more compaction energy. The stability of cold compacted mixture at the age of 1 hour gave 844.74 kg (min. 500 kg). Towards this value, at the age of 48 hours; 96 hours; 192 hours; 384 hours, respectively gave increase of stability of 102%; 140%; 183%; 187% and then constant. Cold compaction on site gave less performance with porosity values in a range of 4.585-8.22% (spec. 4% -10%), therefore the VFB is less than minimum 65% of VMA; the stability obtained was 1422.72 kg (>min 500kg) or 58% stability of the samples compacted in lab at the same 16 days of age where stability had become maximum (constant). Cantabro test result of the cold mix gave 100% weight loss (the sample disintegrated), meanwhile the hot mix only lost 7.56% from 16% max loss.

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25

Li, Peipei, Dechao Wang, Lu Zhang, Chao Liu, Fei Wu, Yongkun Wang, Zheng Wang, et al. "An In Situ Coupling Strategy toward Porous Carbon Liquid with Permanent Porosity." Small 17, no. 10 (January 27, 2021): 2006687. http://dx.doi.org/10.1002/smll.202006687.

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26

Chaix, Arnaud, Georges Mouchaham, Aleksander Shkurenko, Phuong Hoang, Basem Moosa, Prashant M. Bhatt, Karim Adil, Khaled N. Salama, Mohamed Eddaoudi, and Niveen M. Khashab. "Trianglamine-Based Supramolecular Organic Framework with Permanent Intrinsic Porosity and Tunable Selectivity." Journal of the American Chemical Society 140, no. 44 (October 8, 2018): 14571–75. http://dx.doi.org/10.1021/jacs.8b08770.

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27

Banerjee, Debasis, Zhijuan Zhang, Anna M. Plonka, Jing Li, and John B. Parise. "A Calcium Coordination Framework Having Permanent Porosity and High CO2/N2 Selectivity." Crystal Growth & Design 12, no. 5 (March 28, 2012): 2162–65. http://dx.doi.org/10.1021/cg300274n.

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28

Hisaki, Ichiro, Nobuaki Ikenaka, Eduardo Gomez, Boiko Cohen, Norimitsu Tohnai, and Abderrazzak Douhal. "Hexaazatriphenylene-Based Hydrogen-Bonded Organic Framework with Permanent Porosity and Single-Crystallinity." Chemistry - A European Journal 23, no. 48 (August 9, 2017): 11611–19. http://dx.doi.org/10.1002/chem.201701893.

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29

Ferraris, Sara, Graziano Ubertalli, Antonio Santostefano, and Antonio Barbato. "Aluminum Foams as Permanent Cores in Casting." Materials Proceedings 3, no. 1 (February 20, 2021): 3. http://dx.doi.org/10.3390/iec2m-09253.

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Their low density and high specific stiffness and impact energy/vibration absorption ability make Al-based metal foams promising materials in applications for which a light weight and energy/vibration absorption abilities are crucial. In view of these properties, Al-based foams can be extremely interesting as cores in cast components in order to improve their performances and simplify their whole technological process. However, both in the scientific literature and in technological application, this topic is still poorly explored. In the present work, Al-based metal foams (Cymat foams and Havel metal foams in the form of rectangular bars) are used in a gravity casting experiment of an Al-Si-Cu-Mg alloy (EN AB-46400). The foams were fully characterized before and after insertion in casting. Porosity, cell wall and external skin thickness, microstructure, infiltration degree, and the quality of the interface between the foam core and the dense cast shell, have been investigated by means of optical microscopy and scanning electron microscopy equipped with energy dispersive spectroscopy (SEM-EDS). The analyses evidenced that a continuous and thick external skin protect the foam from infiltration by molten metal, preserving the initial porosity and insert shape. A detailed analysis of the foam’s external skin highlights that the composition of this external skin is crucial for the obtaining of a good joining between the molten metal and the Al foam core. In fact, the presence of Mg oxides on the foam surface prevents bonding, and maintains a gap between the core and the shell. This point opens up the opportunity to design innovative surface modifications for this external skin as promising strategies for the optimization of cast components with a foam core.

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30

Naeem, Ayesha, Valeska P. Ting, Ulrich Hintermair, Mi Tian, Richard Telford, Saaiba Halim, Harriott Nowell, et al. "Mixed-linker approach in designing porous zirconium-based metal–organic frameworks with high hydrogen storage capacity." Chemical Communications 52, no. 50 (2016): 7826–29. http://dx.doi.org/10.1039/c6cc03787a.

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New zirconium based metal–organic framework (UBMOF-31) synthesised using mixed-linker strategy showing permanent porosity, excellent hydrogen uptake, and high selectivity for adsorption of CO₂ over N₂.

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31

Zhou, Yue, Liang Kan, Jarrod F. Eubank, Guanghua Li, Lirong Zhang, and Yunling Liu. "Self-assembly of two robust 3D supramolecular organic frameworks from a geometrically non-planar molecule for high gas selectivity performance." Chemical Science 10, no. 26 (2019): 6565–71. http://dx.doi.org/10.1039/c9sc00290a.

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Two 3D SOFs were synthesized based on a ‘direction-oriented’ strategy. The unique and permanent porosity structures exhibit remarkable ability to separate CO₂ from N₂ and light hydrocarbons.

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32

Bai, M. G. Monika, H. Vignesh Babu, V. Lakshmi, and M. Rajeswara Rao. "Structure–property–function relationship of fluorescent conjugated microporous polymers." Materials Chemistry Frontiers 5, no. 6 (2021): 2506–51. http://dx.doi.org/10.1039/d0qm00769b.

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Fluorescent porous organic polymers are a unique class of materials owing to their strong aggregation induced emission, long range exciton migration and permanent porosity, thus envisioned to possess a wide range of applications (sensing, OLEDs).

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33

Zhuo, Chao, Fei Wang, and Jian Zhang. "Synthesis of homochiral zeolitic imidazolate frameworks via solvent-assisted linker exchange for enantioselective sensing and separation." CrystEngComm 20, no. 39 (2018): 5925–28. http://dx.doi.org/10.1039/c8ce00403j.

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Two homochiral zeolitic imidazolate frameworks (S- and R-ZIF-78h) of GME topology are synthesized via solvent-assisted linker exchange (SALE) of ZIF-78, which exhibit permanent porosity and enantioselective sensing and separation of proline.

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34

Alexander, Francesca M., Sergio F. Fonrouge, José L. Borioni, Mario G. Del Pópolo, Peter N. Horton, Simon J. Coles, Benjamin P. Hutchings, Deborah E. Crawford, and Stuart L. James. "Noria and its derivatives as hosts for chemically and thermally robust Type II porous liquids." Chemical Science 12, no. 42 (2021): 14230–40. http://dx.doi.org/10.1039/d1sc03367k.

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Porous Liquids (PLs) are a new class of material that possess both fluidity and permanent porosity. Here we identify Noria, a rigid cyclic oligomer as a new host for the synthesis of more robust Type II PLs.

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35

Sugita, I. Ketut Gede, I. G. N. Priambadi, and Ketut Astawa. "Densitas dan Kegagalan Produksi pada Proses Produksi Genta Bali." Jurnal Energi Dan Manufaktur 13, no. 1 (April 30, 2020): 28. http://dx.doi.org/10.24843/jem.2020.v13.i01.p05.

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Proses pembuatan lonceng tradisional berbahan perunggu dilakukan dengan proses pengecoran. Bahan yang biasa digunakan dalam produksi lonceng tradisional adalah paduan perunggu denganperbandingan persentase tembaga (Cu) 80% dan timah (Sn) 20%. Paduan ini memiliki sifat mekanik dan akustik yang lebih baik dibandingkan dengan kuningan. Tujuan dari penelitian ini adalah untuk menentukan karakteristik kepadatan dan cacat cor dalam proses produksi lonceng tradisional. Paduan perunggu dilebur dalam tungku crucible pada temperatur tuang 1000, 1050, 1100 °C. Paduan yang telah mencair dituang ke dalam cetakan permanen yang telah dipanaskan terlebih dahulu pada temperatur 200, 300, 400°C. Billet hasil coran dipotong-potong dan dimanufacturing untuk pembuatan spesimen uji densitas dan porositas. Hasil penelitian menunjukkan bahwa variasi temperatur penuangan mempengaruhi densitas dan cacat hasil coran. Semakin tinggi temeratur tuang berdampak pada semakin banyak cacat yang terjadi, terutama cacat-cacat porositas. Porositas material yang lebih kecil berpengaruh pada kualitas akustik yang lebih baik. The process of making traditional bells made of bronze alloys is a casting process. Materials commonly used in the production of traditional bells are bronze with a percentage of copper (Cu) of 80% and tin (Sn) of 20%. This alloy has better mechanical and acoustic properties compared to brass. The purpose of this study was to determine the characteristics of density and cast defects in the traditional bell production process. The bronze alloy was melted in a crucible furnace at a temperature of 1000, 1050, 1100°C. The melted alloys were poured into a permanent mold that has been heated at a temperature of 300°C. Castings billets were cut into pieces and manufactured for making density and casting defect test specimens. The results showed that the variation of the pouring temperature affected the density and casting defects. The higher the pouring temperature has an impact on the more cast defects, especially the porosity of the cast. Low porosity affects better acoustic quality.

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36

Chao, Zhiming, Guotao Ma, Xiewen Hu, Kun He, Gang Luo, Xuefeng Mei, and Dong Li. "Experimental research on stress-dependent permeability and porosity of rock-like materials with different thicknesses of smooth hidden joints." International Journal of Modern Physics B 34, no. 12 (May 10, 2020): 2050117. http://dx.doi.org/10.1142/s0217979220501179.

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In this paper, a method is proposed to prepare rock-like materials with different thicknesses of hidden joints. Then, permeability and porosity of the self-prepared jointed specimens under different pore pressures during confining pressure loading and unloading are measured. The experimental results indicate that the gas permeability of the jointed specimens gradually decreases with the rise of pore pressure due to the existence of Klinkenberg effect, and Klinkenberg effect gradually decreases with the rise of hidden joint thickness. As the main seepage channels, hidden joints govern the seepage characteristics, and due to the existence of hidden joints, the intrinsic permeability is improved significantly. Besides, due to the existence of hidden joints, the intrinsic permeability and porosity are more sensitive to confining pressure loading than that of the intact specimen, and the sensitivity increases with the rise of hidden joint thickness. During confining pressure loading, there is a permanent deformation of the hidden joints and pores in the specimens, which results in both the intrinsic permeability and porosity being always lower than those in the loading process. Meanwhile, the permanent deformation rises with the increases of hidden joint thickness, which leads to the increases of gap of intrinsic permeability and porosity under loading and unloading processes. Additionally, after comparison of the fitting results, the sub-cubic law can reflect the relationship between flow rate and the thickness of non-persistent joints better than the cubic law.

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37

Li, Xinle. "sp2 carbon-conjugated covalent organic frameworks: synthesis, properties, and applications." Materials Chemistry Frontiers 5, no. 7 (2021): 2931–49. http://dx.doi.org/10.1039/d1qm00015b.

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sp² carbon-conjugated COFs (sp²c-COFs) featuring an unparalleled combination of sp² carbon linkages, extended π-conjugation, high crystallinity, permanent porosity, unique optoelectronic properties, and extraordinary chemical stability, have garnered enormous attention recently.

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38

Rosseinsky, M. J. "Recent developments in metal–organic framework chemistry: design, discovery, permanent porosity and flexibility." Microporous and Mesoporous Materials 73, no. 1-2 (August 2004): 15–30. http://dx.doi.org/10.1016/j.micromeso.2003.05.001.

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39

Liu, Shengjun, Jiandang Liu, Xudong Hou, Tingting Xu, Jing Tong, Junxiang Zhang, Bangjiao Ye, and Bo Liu. "Porous Liquid: A Stable ZIF-8 Colloid in Ionic Liquid with Permanent Porosity." Langmuir 34, no. 12 (March 6, 2018): 3654–60. http://dx.doi.org/10.1021/acs.langmuir.7b04212.

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40

Dan-Hardi, Meenakshi, Hubert Chevreau, Thomas Devic, Patricia Horcajada, Guillaume Maurin, Gérard Férey, Dmitry Popov, et al. "How Interpenetration Ensures Rigidity and Permanent Porosity in a Highly Flexible Hybrid Solid." Chemistry of Materials 24, no. 13 (June 18, 2012): 2486–92. http://dx.doi.org/10.1021/cm300450x.

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41

Augustyniak, A. W., M. Fandzloch, M. Domingo, I. Łakomska, and J. A. R. Navarro. "A vanadium(iv) pyrazolate metal–organic polyhedron with permanent porosity and adsorption selectivity." Chemical Communications 51, no. 79 (2015): 14724–27. http://dx.doi.org/10.1039/c5cc05913e.

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A vanadium(iv) pyrazolate-based open metal–organic polyhedron of [V₃(μ₃-O)O(OH)₂(μ₄-BPD)_1.5(μ-HCOO)₃] (BDP = benzene-1,4-bipyrazolate) formulation gives rise to a porous crystal structure exhibiting micro and mesoporosity which is useful for selective adsorption of gases.

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42

Sun, Daofeng, Yanxiong Ke, David J. Collins, Gary A. Lorigan, and Hong-Cai Zhou. "Construction of Robust Open Metal−Organic Frameworks with Chiral Channels and Permanent Porosity." Inorganic Chemistry 46, no. 7 (April 2007): 2725–34. http://dx.doi.org/10.1021/ic0624773.

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43

Hu, Falu, Caiping Liu, Mingyan Wu, Jiandong Pang, Feilong Jiang, Daqiang Yuan, and Maochun Hong. "An Ultrastable and Easily Regenerated Hydrogen-Bonded Organic Molecular Framework with Permanent Porosity." Angewandte Chemie International Edition 56, no. 8 (January 16, 2017): 2101–4. http://dx.doi.org/10.1002/anie.201610901.

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Hu, Falu, Caiping Liu, Mingyan Wu, Jiandong Pang, Feilong Jiang, Daqiang Yuan, and Maochun Hong. "An Ultrastable and Easily Regenerated Hydrogen-Bonded Organic Molecular Framework with Permanent Porosity." Angewandte Chemie 129, no. 8 (January 16, 2017): 2133–36. http://dx.doi.org/10.1002/ange.201610901.

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Schute, Kai, Felicitas Jansen, and Marcus Rose. "Solvent-Responsive and Switchable Nanofiltration Membranes based on Hypercrosslinked Polymers with Permanent Porosity." ChemNanoMat 4, no. 6 (April 6, 2018): 562–67. http://dx.doi.org/10.1002/cnma.201800036.

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Thanabumrungkul, S., W. Jumpol, Rungsinee Canyook, N. Meemongkol, and Jessada Wannasin. "Characterization of Microstructure and Shrinkage Porosity of a Semi-Solid Metal Slurry in Gravity Die Casting." Solid State Phenomena 285 (January 2019): 161–66. http://dx.doi.org/10.4028/www.scientific.net/ssp.285.161.

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Current aluminum automotive parts such as wheels, engine and transmission components are produced by tilted gravity die casting for control gas porosity. But, there are still problems resulting in inefficient production: shrinkage porosity, microstructure size and uniformity. Shrinkage porosity is one of the major issues which affects mechanical properties such as strength and elongation in tilted pour permanent mold. Recent work using slurry casting technique has shown potential in gravity sand casting. Results show that the casting parts have complete filling at low solid fractions and the casting yield is also higher than conventional gravity sand casting. This paper extends important work for potential industrial applications in gravity die casting: microstructure size, uniformity, solid fraction control for micro shrinkage level.

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Ferraris, Sara, Antonio Santostefano, Antonio Barbato, Roberto Molina, and Graziano Ubertalli. "Al-Based Foams as Permanent Cores in Al Castings: Effect of Surface Skin Thickness and Composition on Infiltration and Core-Shell Bonding." Metals 11, no. 11 (October 27, 2021): 1715. http://dx.doi.org/10.3390/met11111715.

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An emerging and still poorly explored application of aluminum foams is their potential use as permanent cores (inserts) in the casting of aluminum alloys. In this context, Al-based foams can introduce a weight reduction, the obtainment of cavities, a strength increase, the ability to absorb impact energy and vibration, acoustic insulation ability, the possibility to simplify the technological processes (no removal/recycling of traditional sand cores), and finally, they can be fully recyclable. Cymat-type Al foams with thin outer skin were used as permanent cores in Al-alloy gravity casting in the present research. Al-foams were characterized in terms of porosity, density, cell wall and skin thickness, surface chemical composition and morphology, and compression resistance. Cast objects with foam inserts were characterized by means of optical microscopy. The preservation of up to 50% of the initial porosity was observed for foam inserts with higher density. Metallurgical bonding between the foam core and the cast metal was observed in some regions.

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Bila, José L., Joffrey Pijeat, Andrea Ramorini, Farzaneh Fadaei-Tirani, Rosario Scopelliti, Emilie Baudat, and Kay Severin. "Porous networks based on iron(ii) clathrochelate complexes." Dalton Transactions 48, no. 14 (2019): 4582–88. http://dx.doi.org/10.1039/c9dt00546c.

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Iron clathrochelate complexes were used for the preparation of microporous polymers. The networks display permanent porosity with apparent Brunauer–Emmett–Teller surface areas of up to SA_BET = 593 m² g⁻¹, and they are not susceptible to hydrolytic degradation.

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GHOSH, TRIDIV, PRAGATI PRAMANIK MAITY, T. K. DAS, PRAMEELA KRISHNAN, ARTI BHATIA, PRIYA BHATTACHARYA, and D. K. SHARMA. "Variation of porosity, pore size distribution and soil physical properties under conservation agriculture." Indian Journal of Agricultural Sciences 90, no. 11 (December 16, 2020): 2051–58. http://dx.doi.org/10.56093/ijas.v90i11.108558.

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For sustainable crop production and maintenance of soil health, conservation agriculture (CA) practices provides an opportunity for improving soil structure and physical health, nutrient and water use efficiency, soil organic carbon and mitigation of greenhouse gases emission from agriculture. CA is primarily based on four crop management practices such as minimum soil disturbance or no-tillage; permanent or semi-permanent retention of crop residue; crop rotation and control traffic. Different CA management practices affect crop yield as well as soil properties. CA makes necessary modifications in different soil hydro-physical properties, viz. increase in soil water infiltration, reduction in water runoff and soil loss, and reduction in evaporation loss. No tillage (NT), residue retention and crop rotation combined effect the soil organic carbon concentration. Different crop rotations and residue retentions and crops with different rooting depths used in CA practices have proved to reduce the compaction constraints.CA can help to mitigate GHG emissions, viz methane (CH4) and nitrous oxide (N2O) from agriculture by improving soil C sequestration, enhancing soil quality, nitrogen and water use efficiencies, and decreasing fuel consumption. But effect of CA and conventional agricultural practices of porosity and pore size distribution is very much limited. When CA is practiced for six to ten years there is improvement in soil structure, porosity and pore size distribution, macro-micro faunal activity, and organic matter content..The soil under ZT has the lowest porosity as compared to conventional management practices. The highest porosity and the maximum connected pores are frequently seen in conventionally tilled soil. In this paper, an attempt has been made to review the variation of porosity and pore size distribution and other soil physical properties under conservation agricultural practices.

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Chen, Jian, Xiongfei Li, Wei Li, Cong Li, Baoshan Xie, Shuowei Dai, Jian-Jun He, and Yanjie Ren. "Research on energy absorption properties of open-cell copper foam for current collector of Li-ions." Materials Science-Poland 37, no. 1 (March 1, 2019): 8–15. http://dx.doi.org/10.2478/msp-2019-0011.

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AbstractQuasi-static uniaxial compressive tests of open-cell copper (Cu) foams (OCCF) were carried out on an in-situ bi-direction tension/compress testing machine (IBTC 2000). The effects of strain rate, porosity and pore size on the energy absorption of open-cell copper foams were investigated to reveal the energy absorption mechanism. The results show that three performance parameters of open-cell copper foams (OCCF), involving compressive strength, Young modulus and yield stress, increase simultaneously with an increase of strain rate and reduce with increasing porosity and pore size. Furthermore, the energy absorption capacity of OCCF increases with an increase of porosity and pore size. However, energy absorption efficiency increases with increasing porosity and decreasing pore size. The finite element simulation results show that the two-dimensional stochastic model can predict the energy absorption performance of the foam during the compressive process. The large permanent plastic deformation at the weak edge hole is the main factor that affects the energy absorption.

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