Zeolitic Tissue Through Wood Cell Templating

Dong, Angang; Wang, Yajun; Tang, Yi; Ren, Nan; Zhang, Yahong; Yue, Yinghong; Gao, Ziwen

doi:10.1002/1521-4095(20020618)14:12<926::aid-adma926>3.0.co;2-1

Cited by 246 publications

(158 citation statements)

References 7 publications

(10 reference statements)

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“…This phenomenon is unique, and quite different from other routes reported previously. [24][25][43][44][45][46][47][48][49][50] As the size of the microporous zeolite crystal formed is similar to that of the starting amorphous aggregate of nanoparticles, this could potentially indicate that each aggregate of nanoparticles was transformed into a zeolite crystal, possibly due to good accessibility for the structure-directing agent and supplementary silica source of the unique mesostructure formed by aggregation of the nanoparticle precursor and the relatively mild glycerol system. This is probably a critical factor in the formation of uniform crystals and maintenance of the mesostructure.…”

Section: Resultsmentioning

confidence: 99%

“…The question then arises whether an atypical hydrothermal process can be used for the synthesis, that is, a method that minimizes the damage to the mesoporous and macroporous structure caused by hydrothermal synthesis. Some successful methods were demonstrated by Kanno et al, Campos et al, Coppens et al, and Kaliaguine et al, [24,25,[43][44][45][46][47][48][49][50] who used glycerol as a medium to directly synthesize zeolites, to recrystallize mesoporous silica to zeolite, to embed zeolite nanocrystals into a well-connected amorphous matrix, and to coat the walls of mesostructured materials with zeolite nanoclusters, respectively. However, the generation of crystalline micro-meso-macroporous aluminosilicates constructed entirely from zeolite nanocrystals with interconnectivity on three length scales still remains a great challenge, since the structures of the mesoporous aluminosilicates would still be easily destroyed during reactions even when using the glycerol system.…”

Section: Introductionmentioning

confidence: 99%

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Well‐Organized Zeolite Nanocrystal Aggregates with Interconnected Hierarchically Micro–Meso–Macropore Systems Showing Enhanced Catalytic Performance

Yang

Tian

Chen

et al. 2011

Chemistry A European J

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Preparation and characterization of well‐organized zeolitic nanocrystal aggregates with an interconnected hierarchically micro–meso–macro porous system are described. Amorphous nanoparticles in bimodal aluminosilicates were directly transformed into highly crystalline nanosized zeolites, as well as acting as scaffold template. All pores on three length scales incorporated in one solid body are interconnected with each other. These zeolitic nanocrystal aggregates with hierarchically micro–meso–macroporous structure were thoroughly characterized. TEM images and 29Si NMR spectra showed that the amorphous phase of the initial material had been completely replaced by nanocrystals to give a micro–meso–macroporous crystalline zeolitic structure. Catalytic testing demonstrated their superiority due to the highly active sites and the presence of interconnected micro–meso–macroporosity in the cracking of bulky 1,3,5‐triisopropylbenzene (TIPB) compared to traditional zeolite catalysts. This synthesis strategy was extended to prepare various zeolitic nanocrystal aggregates (ZSM‐5, Beta, TS‐1, etc.) with well‐organized hierarchical micro–meso–macroporous structures.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Well‐Organized Zeolite Nanocrystal Aggregates with Interconnected Hierarchically Micro–Meso–Macropore Systems Showing Enhanced Catalytic Performance

Yang

Tian

Chen

et al. 2011

Chemistry A European J

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“…Despite these experimental variations, the initial steps in these processes all involve permineralization, where silica precipitates in open spaces within the intact wood ( Figure 13). to use wood as a template for deposition of ceramic materials such as silicon carbide [28][29][30][31], or zeolites [32]. The goal of these studies has been to achieve porous materials that have industrial value, rather than to duplicate natural silicification.…”

Section: Laboratory Simulationsmentioning

confidence: 99%

Wood Petrifaction: A New View of Permineralization and Replacement

Mustoe

2017

Geosciences

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Petrified wood has traditionally been divided into two categories based on preservation processes: permineralization (where tissues are entombed within a mineral-filled matrix) and replacement (where organic anatomical features have been replicated by inorganic materials). New analytical evidence suggests that for most petrified wood, permineralization and replacement are not independent processes; instead, both processes may occur contemporaneously during diagenesis. Infiltration of mineral-bearing groundwater may initially cause permineralization of cellular tissues, but the wood is undergoing gradual degradation. The degree of anatomical preservation thus depends on the relative rates of mineral precipitation and tissue destruction. Rapid rates of mineralization under relatively mild Eh and pH conditions favor the preservation of organic matter. These conditions appear to be more common for calcium carbonate deposition than for silicification, based on observations of fossil woods from many localities. Because of these preservational complexities, "mineralization" and "mineralized" are more accurate as general descriptive terms than "permineralization" and "permineralized".

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“…[1][2][3][4] Consequently there is considerable scientific interest in replicating the intricate architectures found in nature, [5][6][7][8][9] as well as enhancing the intrinsic properties of biomineralised structures' by decoration with inorganic nanostructures. [10][11][12][13] Diatoms are marine-dwelling eukaryotic unicellular algae, 14 which produce biomineralised silica exoskeletons known as frustules.…”

mentioning

confidence: 99%

Modelling the nucleation, growth and coarsening kinetics of γ″ (D022) precipitates in the Ni-base Alloy 625

2016

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We report the use of diatom frustules as scaffolds for the growth of molybdenum disulfide nanosheets. The frustules were impregnated with a single source molecular precursor complex which is converted to MoS 2 by solventless thermolysis. Randomly oriented few-layer thick MoS 2 nanosheets are found to coat both the exterior surface and internal pores of the scaffold.Nature displays exquisite control of phase and morphology during biomineralisation and the resulting mineralised structures have been found to possess attractive functional properties, particularly in the area of photonics. [1][2][3][4] Consequently there is considerable scientific interest in replicating the intricate architectures found in nature, 5-9 as well as enhancing the intrinsic properties of biomineralised structures' by decoration with inorganic nanostructures. [10][11][12][13] Diatoms are marine-dwelling eukaryotic unicellular algae, 14 which produce biomineralised silica exoskeletons known as frustules. Diatom frustules comprise the majority of the biosilica found in oceans, 14 and bulk quantities of the fossilised shells are recovered by dredging. This material is known as diatomaceous-earth (DE). It is widely available and inexpensive and finds use in a number of products including toothpaste and as a laboratory filter aid (under the trade name Celite™). Additionally, the intricate hierarchical nanostructures found in diatom frustules have attracted considerable interest for nanotechnology applications. 15,16 Diatom frustules have the highest strength-to-weight ratio of all reported natural biomaterials, 17 their periodic nanoscale pores result in both high surface areas and unique photonic properties which enhance light uptake. 15, 18 In the living diatom this aids photosynthesis but the functional structures persist in the deceased organisms' biomineral shell. 15, 18, 19 Biosilica is an inert insulator which provides an ideal scaffold or template for functional materials. 13, 15,[20][21][22] By introducing semiconducting materials into the biomineralised architecture it is potentially possible to exploit the frustules' photonic properties for light harvesting or its large surface area for sensing and catalytic applications. 15, 19, 20 For example, diatom frustules coated with TiO 2 have been incorporated into dye sensitised solar cells, where the devices' enhanced performance was attributed to improved light scattering by the diatoms. 15 A surface sol-gel process has been used to coat diatom frustules with a ~50 nm thick layer of SnO 2 ; the resulting structures were used as NO gas detectors. 20 Bao et al. have reported the conversion of the insulating silica of diatom frustules to semiconducting silicon by magnesiothermic reduction, 23 after which the photocatalytic properties of the resulting structures was enhanced by subsequent deposition of CdS on the frustule's surface. 19 However, to-date, there have been no reports of the functionalization of biomineralised structure with twodimensional (2D) semiconductor materials.Mol...

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Zeolitic Tissue Through Wood Cell Templating

Cited by 246 publications

References 7 publications

Well‐Organized Zeolite Nanocrystal Aggregates with Interconnected Hierarchically Micro–Meso–Macropore Systems Showing Enhanced Catalytic Performance

Well‐Organized Zeolite Nanocrystal Aggregates with Interconnected Hierarchically Micro–Meso–Macropore Systems Showing Enhanced Catalytic Performance

Wood Petrifaction: A New View of Permineralization and Replacement

Modelling the nucleation, growth and coarsening kinetics of γ″ (D022) precipitates in the Ni-base Alloy 625

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