Synthesis and Fabrication of Inorganic Porous Materials: From                    Nanometer to Millimeter Sizes

Takahashi, Minoru; Fuji, Masayoshi

doi:10.14356/kona.2002011

Cited by 14 publications

(7 citation statements)

References 35 publications

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“…Across the structures produced in this study with either method, pore diameters ranged from ∼0.5 mm to ∼2.1 mm and so are within the range found typically in soils ( 24 , 25 ), building materials ( 26 , 27 ), and biomedical materials such as tissue scaffolding ( 28 ). If desirable, it should be possible to produce structures with smaller (or larger) pore sizes by using smaller beads or higher-resolution 3D printing technology.…”

Section: Discussionsupporting

confidence: 64%

Microbial Metal Resistance within Structured Environments Is Inversely Related to Environmental Pore Size

Harvey

Mitzakoff

Wildman

et al. 2021

Appl Environ Microbiol

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The physical environments in which microorganisms naturally reside rarely have homogeneous structure, and changes in their porous architecture can have a profound effect on microbial activities – effects that are not typically captured in conventional laboratory studies. Here, to investigate the influence of environmental structure on microbial responses to stress, we constructed structured environments with different pore properties (determined by X-ray Computed Tomography). First, using glass beads in different arrangements and inoculated with the soil yeast Saitozyma podzolica , increases in the average equivalent spherical diameters (ESD) of a structure’s porous architecture led to decreased survival of the yeast under a toxic metal challenge. This relationship was reproduced when yeasts were introduced into additively-manufactured lattice structures, comprising regular arrays with ESDs comparable to those of the bead structures. The pore ESD-dependency of metal resistance was not attributable to differences in cell density in micro-environments delimited by different pore sizes, supporting the inference that pore size specifically is the important parameter here in determining microbial survival of stress. These findings highlight the importance of the physical architecture of an organism’s immediate environment for its response to environmental perturbation, while offering new tools for investigating these interactions in the laboratory. IMPORTANCE Interactions between cells and their structured environments are poorly understood but have significant implications for organismal success in both natural and non-natural settings. This work uses a multidisciplinary approach to develop laboratory models with which the influence of a key parameter of environmental structure – pore size – on cell activities can be dissected. Using these new methods in tandem with additive manufacturing, we demonstrate that resistance of yeast soil-isolates to stress (from a common metal pollutant) is inversely related to pore size of their environment. This has important ramifications for understanding how microorganisms respond to stress in different environments. The findings also establish new pathways for resolving the effects of physical environment on microbial activity, enabling important understanding that is not readily attainable with traditional bulk-sampling and analysis approaches.

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Section: Discussionsupporting

confidence: 64%

Microbial Metal Resistance within Structured Environments Is Inversely Related to Environmental Pore Size

Harvey

Mitzakoff

Wildman

et al. 2021

Appl Environ Microbiol

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“…3,4 To mitigate the foregoing problems, ceramic materials and processes should be developed capable not only of alleviating such environmental issues but also of providing a recycling system of generated wastes. 5,6 One of the attractive ways of tailoring the material well-suited to environmental concern is the incorporation of pores within a ceramic microstructure 7 many unique properties such as high permeability, high surface area, good insulating characteristics, etc. These properties make porous ceramics suitable for a wide range of applications such as filters, membranes, sensors, catalyst carriers, piezoelectric ceramics, biomedical and construction materials.…”

Section: Introductionmentioning

confidence: 99%

“…In providing such applications, the porous ceramics are designed to have different pore morphologies and size distributions using porous shaping techniques. [7][8][9] As reported to date regarding the shaping of porous ceramics, gelcasting has emerged as the versatile method. This method, originally developed by Oak Ridge research laboratory for the fabrication of dense ceramics, 10 combines the foaming of aqueous slurry consisting of inorganic powder and monomers in N 2 atmosphere and the in situ polymerization of the foamed slurry.…”

Section: Introductionmentioning

confidence: 99%

Opportunities of porous ceramics fabricated by gelcasting in mitigating environmental issues

Takahashi

Menchavez

Fuji

et al. 2009

Journal of the European Ceramic Society

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“…55 Fick's law of diffusion establishes that molecular transport in porous media occurs from a region 56 of high concentration to another of low concentration and is an important source of motion on a 57 microscopic scale in the porous structures (Kelbaliev & Manafov, 2009). Molecular diffusion is 58 extremely low, so its importance has meaning only over short distances or long timescales 59 because they control mechanism moisture permeability of porous materials whose pore sizes are 60 in the approximate range of 0.1 to 10 µm (Takahashi & Fuji, 2002;Potter, Wiggert, & Ramadan, 61 2011).…”

mentioning

confidence: 99%

Effect of moisture evaporation from diatomaceous earth pellets on storage stability ofSteinernema glaseri

Cortés-Martínez

Ruiz-Vega

Matadamas-Ortiz

et al. 2016

Biocontrol Science and Technology

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A c c e p t e d M a n u s c r i p t 2 Induction of anhydrobiosis and storage stability of entomopathogenic nematodes are influenced by moisture availability. Decreasing moisture content in diatomaceous earth pellets containing Steinernema glaseri NJ-43 strain and its effect on survival time and infectivity of the nematode was determined. Pelletisation was performed in a vortex mixer, using diatomaceous earth Celite ® 209 as desiccant material. Pellets were stored at room temperature (23±2 °C) and high relative humidity (96-100%). Nematode survival and infectivity against last instar greater wax moth, Galleria mellonella, were tested daily. Initial average and average equilibrium moisture content in pellets were 66.7% and 13.6%, respectively, and the IJ's mean survival time was 8.8 days. A moisture transfer model based on diffusion and evaporation was evaluated to predict moisture fluctuations within the pellets. We concluded that 84% of variation in S. glaseri infectivity on G. mellonella larvae was explained by the survival of the nematode whereas 52% of variation in S. glaseri survival was explained by the loss of moisture from the pellets. The moisture transfer model achieved 78% reliability in predicting moisture content and fluctuations. Therefore, the mechanisms of moisture diffusion and evaporation from the surface to the surrounding atmosphere contribute significantly to moisture loss from the pellets.

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Synthesis and Fabrication of Inorganic Porous Materials: From Nanometer to Millimeter Sizes

Abstract: In recent years, the functions of porous ceramics such as light weight, thermal insulation, permeability, separation, adsorption, and

Cited by 14 publications

References 35 publications

Microbial Metal Resistance within Structured Environments Is Inversely Related to Environmental Pore Size

Microbial Metal Resistance within Structured Environments Is Inversely Related to Environmental Pore Size

Opportunities of porous ceramics fabricated by gelcasting in mitigating environmental issues

Effect of moisture evaporation from diatomaceous earth pellets on storage stability ofSteinernema glaseri

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