In situ capabilities of Small Angle X-ray Scattering

Feng, Jinghua; Kriechbaum, Manfred; Liu, Emily

doi:10.1515/ntrev-2019-0032

Cited by 16 publications

(5 citation statements)

References 105 publications

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“…For many amorphous mesoporous materials, the fractal dimension of the surface is somewhere in between: 2 < D f < 3 . This was confirmed by many experimental studies [331,333,340], using adsorption measurements and small-angle X-ray scattering [341,342]. The surface roughness that is inherent to amorphous materials can be accounted for in studies of diffusion and reaction in mesopores [336,337].…”

Section: Pore Network Modelsmentioning

confidence: 66%

Connecting theory and simulation with experiment for the study of diffusion in nanoporous solids

et al. 2021

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Nanoporous solids are ubiquitous in chemical, energy, and environmental processes, where controlled transport of molecules through the pores plays a crucial role. They are used as sorbents, chromatographic or membrane materials for separations, and as catalysts and catalyst supports. Defined as materials where confinement effects lead to substantial deviations from bulk diffusion, nanoporous materials include crystalline microporous zeotypes and metal–organic frameworks (MOFs), and a number of semi-crystalline and amorphous mesoporous solids, as well as hierarchically structured materials, containing both nanopores and wider meso- or macropores to facilitate transport over macroscopic distances. The ranges of pore sizes, shapes, and topologies spanned by these materials represent a considerable challenge for predicting molecular diffusivities, but fundamental understanding also provides an opportunity to guide the design of new nanoporous materials to increase the performance of transport limited processes. Remarkable progress in synthesis increasingly allows these designs to be put into practice. Molecular simulation techniques have been used in conjunction with experimental measurements to examine in detail the fundamental diffusion processes within nanoporous solids, to provide insight into the free energy landscape navigated by adsorbates, and to better understand nano-confinement effects. Pore network models, discrete particle models and synthesis-mimicking atomistic models allow to tackle diffusion in mesoporous and hierarchically structured porous materials, where multiscale approaches benefit from ever cheaper parallel computing and higher resolution imaging. Here, we discuss synergistic combinations of simulation and experiment to showcase theoretical progress and computational techniques that have been successful in predicting guest diffusion and providing insights. We also outline where new fundamental developments and experimental techniques are needed to enable more accurate predictions for complex systems.

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Section: Pore Network Modelsmentioning

confidence: 66%

Connecting theory and simulation with experiment for the study of diffusion in nanoporous solids

et al. 2021

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“…Generally, an insulating layer with the smooth surface is favorable for forming good interface contact with electron devices, which can improve the electrical performance and the stability of the devices [19]. Because the Al 2 O 3 film was very thin, we did not detect any signal in the small incident angle XRD measurement [20]. Therefore, we performed XRD tests on the precipitate collected in the growth liquid instead, because the precipitate had exactly the same composition and structure as the film.…”

Section: Characterization Of Al 2 O 3 Thin Filmsmentioning

confidence: 87%

Facile growth of aluminum oxide thin film by chemical liquid deposition and its application in devices

Ruan

Sun

et al. 2020

Nanotechnology Reviews

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Uniform and continuous Al2O3 thin films were prepared by the chemical liquid deposition (CLD) method. The breakdown field strength of the amorphous CLD-Al2O3 film is 1.74 MV/cm, making it could be used as a candidate dielectric film for electronic devices. It was further proposed to use the CLD-Al2O3 film as an electron blocking layer in a triboelectric nanogenerator (TENG) for output performances enhancement. Output voltages and currents of about 200 V and 9 µA were obtained, respectively, which were 2.6 times and 3 times, respectively, higher than TENG device without an Al2O3. A colloidal condensation-based procedure controlled by adjusting the pH value of the solution was proposed to be the mechanism of CLD, which was confirmed by the Tyndall effect observed in the growth liquid. The results indicated that the CLD could serve as a low-cost, room temperature, nontoxic and facile new method for the growth of functional thin films for semiconductor device applications.

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“…59 For a deeper reading numerous review articles provide excellent overviews of the physical background, technical issues, and examples of use. [60][61][62][63] The application of in situ SAXS is mainly used to study formation pathways during the crystallization of porous materials as well as to monitor adsorption processes in nanoporous compounds. In 2011 in situ SAXS and in situ wide-angle X-ray scattering (WAXS) were combined for the first time to study the crystallization of two metal-organic frameworks synthesized from similar metal and organic precursors, NH 2 -MIL-101(Al) and NH 2 -MIL-53(Al).…”

Section: In Situ Saxsmentioning

confidence: 99%

A review of recent developments for the in situ/operando characterization of nanoporous materials

Petersen

Weidenthaler

2022

Inorg. Chem. Front.

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In situ capabilities of Small Angle X-ray Scattering

Cited by 16 publications

References 105 publications

Connecting theory and simulation with experiment for the study of diffusion in nanoporous solids

Connecting theory and simulation with experiment for the study of diffusion in nanoporous solids

Facile growth of aluminum oxide thin film by chemical liquid deposition and its application in devices

A review of recent developments for the in situ/operando characterization of nanoporous materials

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