A Hierarchical MFI Zeolite with a Two‐Dimensional Square Mesostructure

2018 ◽  
Vol 57 (3) ◽  
pp. 724-728 ◽  
Author(s):  
Xuefeng Shen ◽  
Wenting Mao ◽  
Yanhang Ma ◽  
Dongdong Xu ◽  
Peng Wu ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Mfi Zeolite

scholarly journals Open-Pore Two-Dimensional MFI Zeolite Nanosheets for the Fabrication of Hydrocarbon-Isomer-Selective Membranes on Porous Polymer Supports

2016 ◽  
Vol 55 (25) ◽  
pp. 7184-7187 ◽  
Author(s):  
Han Zhang ◽  
Qiang Xiao ◽  
Xianghai Guo ◽  
Najun Li ◽  
Prashant Kumar ◽  
...  
Keyword(s):  
Porous Polymer ◽  
Two Dimensional ◽  
Mfi Zeolite ◽  
Polymer Supports ◽  
Selective Membranes

scholarly journals Observation of MEL stacking faults in two-dimensional MFI zeolite nanosheets

2016 ◽  
Vol 22 (S3) ◽  
pp. 1634-1635
Author(s):  
Prashant Kumar ◽  
Han Zhang ◽  
Neel Rangnekar ◽  
Michael Tsapatsis ◽  
K. Andre Mkhoyan
Keyword(s):  
Stacking Faults ◽  
Two Dimensional ◽  
Mfi Zeolite

scholarly journals Open-Pore Two-Dimensional MFI Zeolite Nanosheets for the Fabrication of Hydrocarbon-Isomer-Selective Membranes on Porous Polymer Supports

2016 ◽  
Vol 128 (25) ◽  
pp. 7300-7303 ◽  
Author(s):  
Han Zhang ◽  
Qiang Xiao ◽  
Xianghai Guo ◽  
Najun Li ◽  
Prashant Kumar ◽  
...  
Keyword(s):  
Porous Polymer ◽  
Two Dimensional ◽  
Mfi Zeolite ◽  
Polymer Supports ◽  
Selective Membranes

A Hierarchical MFI Zeolite with a Two‐Dimensional Square Mesostructure

2017 ◽  
Vol 130 (3) ◽  
pp. 732-736 ◽  
Author(s):  
Xuefeng Shen ◽  
Wenting Mao ◽  
Yanhang Ma ◽  
Dongdong Xu ◽  
Peng Wu ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Mfi Zeolite

scholarly journals Two-Dimensional MFI Zeolite Nanosheets Exfoliated by Surfactant Assisted Solution Process

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2327
Author(s):  
Aafaq ur Rehman ◽  
Devipriyanka Arepalli ◽  
Syed Fakhar Alam ◽  
Min-Zy Kim ◽  
Jungkyu Choi ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Lamellar Structure ◽  
Solution Process ◽  
Mechanical Damage ◽  
Lateral Size ◽  
Two Dimensional ◽  
Mfi Zeolite ◽  
Long Period ◽  
The Stability ◽  
Surfactant Assisted

Two-dimensional (2D) zeolite nanosheets are important for the synthesis of high flux zeolite membranes due to their lateral size in a preferred orientation. A way to obtain 2D zeolite nanosheets is to exfoliate interlocked structures generated during the hydrothermal synthesis. The mechanical and polymer assisted exfoliation process leads to mechanical damage in nanosheets and short lateral size. In the present study, polyvinylpyrrolidone (PVP) was introduced as an exfoliation agent and dispersant, so that multilamellar interlocked silicalite-1 zeolite nanosheets successfully exfoliated into a large lateral size (individual nanosheets 500~1200 nm). The good exfoliation behavior was due to the strong penetration of PVP into multilamellar nanosheets. Sonication assisted by mild milling helps PVP molecules to penetrate through the lamellar structure, contributing to the expansion of the distance between adjacent layers and thus decreasing the interactions between each layer. In addition, the stability of exfoliated nanosheets was evaluated with a series of organic solvents. The exfoliated nanosheets were well dispersed in n-butanol and stable for 30 days. Therefore, the PVP-assisted solution-based exfoliation process provides high aspect ratio MFI zeolite nanosheets in organic solvents for a long period.

Spectrophotometric measurements of objective-prism spectra

1966 ◽  
Vol 24 ◽  
pp. 118-119
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Progress Report ◽  
Two Dimensional ◽  
Objective Prism ◽  
Made In

I should like to give you a very condensed progress report on some spectrophotometric measurements of objective-prism spectra made in collaboration with H. Leicher at Bonn. The procedure used is almost completely automatic. The measurements are made with the help of a semi-automatic fully digitized registering microphotometer constructed by Hög-Hamburg. The reductions are carried out with the aid of a number of interconnected programmes written for the computer IBM 7090, beginning with the output of the photometer in the form of punched cards and ending with the printing-out of the final two-dimensional classifications.

Introductory paper

1966 ◽  
Vol 24 ◽  
pp. 3-5
Author(s):  
W. W. Morgan
Keyword(s):  
Line Intensity ◽  
Classification Scheme ◽  
Two Dimensional ◽  
Spectral Classification ◽  
Dimensional Array ◽  
Rr Lyrae ◽  
Metallic Line ◽  
Introductory Paper ◽  
Parameter Varying ◽  
Definition Of

1. The definition of “normal” stars in spectral classification changes with time; at the time of the publication of theYerkes Spectral Atlasthe term “normal” was applied to stars whose spectra could be fitted smoothly into a two-dimensional array. Thus, at that time, weak-lined spectra (RR Lyrae and HD 140283) would have been considered peculiar. At the present time we would tend to classify such spectra as “normal”—in a more complicated classification scheme which would have a parameter varying with metallic-line intensity within a specific spectral subdivision.

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