Tuning of particle morphology and pore properties in mesoporous silicas with multiple organic functional groupsElectronic supplementary information (ESI) available: experimental details, SEM images, N2 adsorption isotherms, pore size distributions, TEM images, and details of solid state 13C and 29Si NMR experiments. See http://www.rsc.org/suppdata/cc/b3/b306255d/

2003 ◽  
pp. 2364 ◽  
Author(s):  
Seong Huh ◽  
Jerzy W. Wiench ◽  
Brian G. Trewyn ◽  
Seahn Song ◽  
Marek Pruski ◽  
...  
Keyword(s):  
Solid State ◽  
Particle Morphology ◽  
Mesoporous Silicas ◽  
Supplementary Information ◽  
29Si Nmr ◽  
Size Distributions ◽  
N2 Adsorption ◽  
Sem Images ◽  
Pore Size Distributions ◽  
Pore Properties

Solvent-tuning of ordered mesoporous silicas prepared through evaporation-induced self-assembly templated by poly(ethylene oxide-b-ε-caprolactone)

RSC Advances ◽  
2014 ◽  
Vol 4 (105) ◽  
pp. 61012-61021 ◽  
Author(s):  
Wei-Cheng Chu ◽  
Chen-Xin Lin ◽  
Shiao-Wei Kuo
Keyword(s):  
Ethylene Oxide ◽  
Self Assembly ◽  
Mesoporous Silicas ◽  
Size Distributions ◽  
Ordered Mesoporous ◽  
Pore Size Distributions ◽  
Evaporation Induced Self Assembly ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Selection Of

Highly ordered mesoporous silicas having narrow pore size distributions and various morphologies merely through selection of an appropriate solvent.

scholarly journals How clonal differences and within-tree heterogeneity affect pore properties of hybrid aspen wood and biochar?

2021 ◽  
Author(s):  
Mika Turunen ◽  
Fernando Urbano-Tenorio ◽  
Kimmo Rasa ◽  
Jari Hyväluoma ◽  
Peetu Rytkönen ◽  
...  
Keyword(s):  
Pore Size ◽  
Populus Tremuloides ◽  
Size Distributions ◽  
Hybrid Aspen ◽  
Aspen Wood ◽  
Pore Property ◽  
X Ray Imaging ◽  
Pore Size Distributions ◽  
Quantitative Image ◽  
Pore Properties

AbstractProduction of applicable and homogeneous biochar for soil amendment purposes would benefit from knowledge on how feedstock heterogeneity impacts key biochar pore properties and how the properties are transformed due to pyrolysis. This study aimed (1) to quantify how clonal differences and within-tree heterogeneity of a hybrid aspen feedstock (wood) impact biochar pore properties and (2) to estimate how pore properties of non-pyrolysed wood materials are transformed when pyrolysed into biochar. The study was conducted by collecting samples from a hybrid aspen (Populus tremula L. × Populus tremuloides Michx.) clonal field trial. Key pore properties of non-pyrolysed and pyrolysed wood samples were quantified with 3D X-ray imaging and quantitative image analyses. The results demonstrated how pyrolysis shifted distinctively bi-modal pore size distributions of the wood samples towards smaller pore size regions. The bi-modal wood tissue structure controlled the pore structure also in the biochars. Due to decreasing cell wall thicknesses, the pyrolysis increased the porosity of the materials. While the thermal process homogenized differences in the wall thicknesses, the thicknesses of the feedstock were also shown to control the resulting thicknesses in the biochars. Mechanisms of biochar pore property formation can be considered important when designing applicable biochars for a chosen purpose. Clonal differences and within-tree heterogeneity had a direct impact only on the wall thicknesses and the pore diameters of vessels. These impacts can be of interest when planning feedstock utilization in biochar production. However, the results suggest that relatively homogeneous biochar can be produced from hybrid aspen feedstocks.

Study for Quantitative Analysis of Loess Microstructure Influence

2012 ◽  
Vol 594-597 ◽  
pp. 522-526
Author(s):  
Peng Ran Song ◽  
Chang Ming Wang
Keyword(s):  
Image Processing ◽  
Pore Size ◽  
Influence Factors ◽  
Fractal Dimensions ◽  
Engineering Properties ◽  
Size Distributions ◽  
Sem Images ◽  
Soil Microstructure ◽  
Computer Image Processing ◽  
Pore Size Distributions

Microstructure is a important index of soil physical, mechanical and engineering properties, SEM images and computer image processing technology make the soil microstructure research developing rapidly in recent years, but the researches on the influence factors and important degree are rare. Process the images form scanning electron microscopy test with the image processing toolbox of MATLAB. Fractal dimensions, porosities and pore size distributions are calculated in different analyzing windows, thresholds and magnifications. The results show that:1) As the results of the experiment influenced greatly by the smaller analyzing windows, in order to get the real calculation value, the medium section was processed; 2) Fractal dimension values are less influenced than porosities and pore size distributions by different thresholds; 3) Too big magnification can cause inaccurate fractal dimensions. Porosities and pore size distributions are inverse growing with increasing of magnification.

scholarly journals Nanoparticles of γ-Sitoesterol and Ag on Clinoptilolite Zeolites

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Miguel Angel Hernandez ◽  
Martha Alicia Salgado ◽  
Roberto Portillo ◽  
Vitalii Petranovskii ◽  
Gabriela Itzel Hernández ◽  
...  
Keyword(s):  
Pore Size ◽  
Surface Area ◽  
Bimodal Distribution ◽  
Antibacterial Activities ◽  
X Ray Diffraction ◽  
N2 Adsorption ◽  
Sem Images ◽  
Gram Positive Bacteria ◽  
Pore Size Distributions ◽  
Clinoptilolite Zeolite

This work reports, the obtainment and stabilization of organic nanoparticles (γ-sitosterol) and Ag cations on the external area of Ca-clinoptilolite zeolite (Z17) are presented. The novelty of the present study lies in the formation and stabilization of nanoparticle organic molecules (γ-sitosterol) and inorganic cations (Ag) on the external area of Ca-clinoptilolite zeolite. The γ-sitosterol nanoparticles were obtained using Tournefortia hirsutissima and were later stabilized on the external area of Ca-clinoptilolite. The Ca-clinoptilolite-rich mineral as well as silver zeolitic minerals was characterized by using X-ray diffraction (XRD) and scanning electron microscopy (SEM); elementary composition of the zeolitic mineral was determined by microanalyses (EDS) and high-resolution adsorption (HRADS) using N2 adsorption as a probe molecule. The EDS results about the exchange with Ag indicate the following sequence: Z17Ag03 > Z17Ag-09 > Z17Ag-06 > Z17Ag-01. The XRD studies indicate that only in the sample Z17Ag-03 there is an average crystal size of nanoparticles formed of 45.387 nm as determined by Sherrer’s equation. SEM images of clinoptilolite showed the presence of crystals with irregular and poorly defined box shapes that are typical for this type of zeolites. The nanoporosity of natural zeolites was studied by N2 adsorption; external areas were estimated through the De Boer and BET equations. The specific surface area calculated by BET equation, A SB , presents the following sequence: γ-SZ17 > Z17 > Z17Ag09 > Z17Ag03 > Z17Ag01 > Z17Ag06, while for the values of the external area obtained by the t method, the sequence is A ST : γ-Z17 > Z17 > Z17Ag03 > z17Ag09 > Z17Ag06 > Z17Ag01. For its part, the pore size distributions tell us that the sample Z17 exhibits a sharp multimodal distribution with pore size maxima happening at 1.262, 1.933, 3.824, and 4.282 nm. Z17Ag01 exhibits a bimodal distribution with pore size maxima occurring at 5.45 and 5.533 nm. The sample Z17Ag06 exhibits a sharp bimodal distribution with pore size maxima happening at 3.666 and 7.021 nm, and the sample Z17Ag09 exhibits a sharp trimodal distribution with pore size maxima happening at 1.853, 4.275 and 5.967 nm. Antibacterial activities of the exchanged samples with Ag on the external surface area were measured as a function of exchange level against Gram-positive bacteria (P. aureoginosa, K. pneumonie, and A. baumannii) and Gram-negative bacteria (E. coli, S. saprophyticcus, S. aureus, and E. feacalis); the selectivity sequence of the clinoptilolite and antibacterial activity results are presented. Z17Ag09 clinoptilolite seemed to be a promising antibacterial material.

scholarly journals An Integrated Imaging Study of the Pore Structure of the Cobourg Limestone—A Potential Nuclear Waste Host Rock in Canada

Minerals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1042
Author(s):  
Zhazha Hu ◽  
Shuangfang Lu ◽  
Jop Klaver ◽  
Jan Dewanckele ◽  
Alexandra Amann-Hildenbrand ◽  
...  
Keyword(s):  
Pore Structure ◽  
Imaging Study ◽  
Size Distributions ◽  
Micro Ct ◽  
Resolution Limit ◽  
Sem Images ◽  
Middle Ordovician ◽  
Pore Size Distributions ◽  
Structure Morphology ◽  
Capillary Bundle

With the development of imaging technology, tools to quantitatively describe pore structure, morphology, and connectivity have been widely applied on low permeable rocks; however, it is still questionable to what extent this information can be used to predict permeability. Applicability and comparability of different techniques are discussed here for the Middle Ordovician Cobourg limestone (Canada), a rock dominated by calcite grains of variable sizes (µm–cm) and heterogeneously distributed quartz, dolomite, pyrite, and meshy clay minerals. Absolute porosities determined by helium pycnometry (HP) in literature are approximately 1.6% (±0.9%), and gas permeabilities range from 10−20 to 10−19 m2. Porosities obtained from BIB-SEM are much smaller compared to those from HP (16–69% of HP). Pores found in clays are smaller, slit-shaped, and more densely spaced when compared to those in calcite minerals. Connectivity between pores could not be resolved with 3D micro-CT or FIB-SEM reconstructions, which have a resolution limit of 8 µm and 10 nm, respectively. However, assuming the pores to be connected, laboratory-derived permeability data could be fitted using a simple capillary bundle model, including information about the visible pore size distributions obtained from BIB-SEM images and a tortuosity range of 8 to 15.

A View Of Macro-Defect-Free (MDF) Pastes

1989 ◽  
Vol 179 ◽  
Author(s):  
M. R. Silsbee ◽  
D. M. Roy ◽  
M. Perez-Pena
Keyword(s):  
Pore Size ◽  
Automated Analysis ◽  
Size Distributions ◽  
Sem Images ◽  
Portland Cements ◽  
Pore Size Distributions

AbstractThe automated analysis of backscattered SEM images from polished surfaces of macro-defect-free cements based on ordinary portland cements is examined. A comparison of several techniques for the determination of pore size distributions in these materials is made.

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