Charting the quantitative relationship between two-dimensional morphology parameters of polyamide membranes and synthesis conditions

2020 ◽  
Vol 5 (1) ◽  
pp. 102-109
Author(s):  
Hyosung An ◽  
John W. Smith ◽  
Wenxiang Chen ◽  
Zihao Ou ◽  
Qian Chen
Keyword(s):  
Quantitative Relationship ◽  
Two Dimensional ◽  
Quantitative Morphometry ◽  
Synthesis Conditions ◽  
Morphology Parameters ◽  
Polyamide Membranes

We integrate TEM imaging with quantitative morphometry to study polyamide membranes synthesized with monomer concentrations systematically varied, to determine synthesis–morphology correlations.

Origami-Based Bistable Metastructures for Low-Frequency Vibration Control

2021 ◽  
Vol 88 (5) ◽  
Author(s):  
Mingkai Zhang ◽  
Jinkyu Yang ◽  
Rui Zhu
Keyword(s):  
Vibration Isolation ◽  
Energy Analysis ◽  
Geometrical Nonlinearity ◽  
Low Frequency ◽  
Quantitative Relationship ◽  
Vibration Modes ◽  
Two Dimensional ◽  
Low Frequency Vibration ◽  
Dynamic Experiments ◽  
Unit Cells

Abstract In this research, we aim to combine origami units with vibration-filtering metastructures. By employing the bistable origami structure as resonant unit cells, we propose metastructures with low-frequency vibration isolation ability. The geometrical nonlinearity of the origami building block is harnessed for the adjustable stiffness of the metastructure’s resonant unit. The quantitative relationship between the overall stiffness and geometric parameter of the origami unit is revealed through the potential energy analysis. Both static and dynamic experiments are conducted on the bistable origami cell and the constructed beam-like metastructure to verify the adjustable stiffness and the tunable vibration isolation zone, respectively. Finally, a two-dimensional (2D) plate-like metastructure is designed and numerically studied for the control of different vibration modes. The proposed origami-based metastructures can be potentially useful in various engineering applications where structures with vibration isolation abilities are appreciated.

Quantitative Two-Dimensional Infrared (2D IR) Spectroscopy: Theoretical Development for General and Specific Cases

1995 ◽  
Vol 49 (9) ◽  
pp. 1243-1253 ◽  
Author(s):  
Sanong Ekgasit ◽  
Hatsuo Ishida
Keyword(s):  
Ir Spectroscopy ◽  
Chemical Species ◽  
Quantitative Relationship ◽  
Theoretical Development ◽  
Spectroscopic Techniques ◽  
Two Dimensional ◽  
2D Ir ◽  
Correlation Strength ◽  
The Relationship ◽  
Spectral Intensities

A quantitative two-dimensional correlation analysis for various spectroscopic techniques is introduced. Normalization of the spectral intensities enables two-dimensional infrared (2D IR) spectroscopy to be used for quantitative purposes. As a result of the normalization, the correlation strengths are characterized by the dynamic parameters of the correlated spectral intensities. Relationships between the chemical species associated with peak positions in 2D IR spectra are characterized by both the magnitude and the sign of the correlation strength. The magnitude describes the degree of harmonization, while the sign shows the relationship between the dynamic behaviors of the correlated spectral intensities. The phase spectrum, which indicates the quantitative relationship among the dynamic behavior of the spectral intensities, is also introduced.

Solid Phase Synthesis of Coating on the Base under the Electron Beam Surfacing

2013 ◽  
Vol 379 ◽  
pp. 60-65 ◽  
Author(s):  
S.N. Sorokova ◽  
A.G. Knyazeva
Keyword(s):  
Electron Beam ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Phase Synthesis ◽  
Synthesis Conditions ◽  
Two Dimensional Model ◽  
Coating Synthesis

Two-dimensional model of the Ti-Ni coating synthesis in condition of the electron-beam treatment is suggested and investigated. The base is iron. The system of chemical reactions is written according to the phase diagram of Ti-Ni.The results of numerical investigation of the model which illustrate the role of the technology parameters in the conversion regimes are represented. Distribution of temperature and elements concentration and compounds in different time moments for different synthesis conditions are constructed. It is shown that at any process organization the synthesized material becomes chemically heterogeneous.

scholarly journals Borophene-graphene heterostructures

2019 ◽  
Vol 5 (10) ◽  
pp. eaax6444 ◽  
Author(s):  
Xiaolong Liu ◽  
Mark C. Hersam
Keyword(s):  
Vertical Integration ◽  
2D Materials ◽  
Two Dimensional ◽  
Promising Candidate ◽  
Diverse Range ◽  
Spectroscopic Measurements ◽  
Synthesis Conditions ◽  
Spatially Resolved ◽  
The Rich ◽  
Its Polymorphism

Integration of dissimilar two-dimensional (2D) materials is essential for nanoelectronic applications. Compared to vertical stacking, covalent lateral stitching requires bottom-up synthesis, resulting in rare realizations of 2D lateral heterostructures. Because of its polymorphism and diverse bonding geometries, borophene is a promising candidate for 2D heterostructures, although suitable synthesis conditions have not yet been demonstrated. Here, we report lateral and vertical integration of borophene with graphene. Topographic and spatially resolved spectroscopic measurements reveal nearly atomically sharp lateral interfaces despite imperfect crystallographic lattice and symmetry matching. In addition, boron intercalation under graphene results in rotationally commensurate vertical heterostructures. The rich bonding configurations of boron suggest that borophene can be integrated into a diverse range of 2D heterostructures.

scholarly journals Атомная структура и оптические свойства слоев CaSi-=SUB=-2-=/SUB=-, выращенных на CaF-=SUB=-2-=/SUB=-/Si-подложках

2021 ◽  
Vol 55 (9) ◽  
pp. 725
Author(s):  
В.А. Зиновьев ◽  
А.В. Кацюба ◽  
В.А. Володин ◽  
А.Ф. Зиновьева ◽  
С.Г. Черкова ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electron Beam ◽  
High Energy ◽  
Two Dimensional ◽  
High Energy Electron ◽  
Photoluminescence Spectra ◽  
Structural And Optical Properties ◽  
Synthesis Conditions ◽  
Simultaneous Irradiation ◽  
Growth Features

In this work, we study the growth features, as well as the structural and optical properties of CaSi2 layers formed in the process of successive deposition of Si and CaF2 on a Si (111) substrate with simultaneous irradiation with high energy electron beam. The Raman spectra recorded in the regions of the electron beam action showed peaks characteristic of crystalline CaSi2 layers. The study of the surface morphology of the grown structures demonstrated that, under the chosen synthesis conditions, the formation of CaSi2 layers during electron irradiation occurs according to a two-dimensional layer mechanism. The photoluminescence spectra measured in the region modified by the electron beam have significant differences from the spectra measured outside this region.

scholarly journals Thin film composite polyamide membranes: parametric study on the influence of synthesis conditions

RSC Advances ◽  
2015 ◽  
Vol 5 (68) ◽  
pp. 54985-54997 ◽  
Author(s):  
B. Khorshidi ◽  
T. Thundat ◽  
B. A. Fleck ◽  
M. Sadrzadeh
Keyword(s):  
Thin Film ◽  
Strong Interaction ◽  
Parametric Study ◽  
Interfacial Polymerization ◽  
Polymerization Reaction ◽  
Film Composite ◽  
Synthesis Conditions ◽  
Thin Film Composite ◽  
Wide Range ◽  
Polyamide Membranes

Analysis of strong interaction between monomers concentrations in interfacial polymerization reaction provides valuable guidelines for making a wide range of salt rejecting membranes.

Mathematical Modeling of the Solid Phase Sintering of Ti and Cu Powders in the Controlled Heating Conditions

2014 ◽  
Vol 1040 ◽  
pp. 500-503
Author(s):  
Svetlana N. Sorokova
Keyword(s):  
Mathematical Modeling ◽  
Phase Diagram ◽  
Temperature Distribution ◽  
Chemical Reactions ◽  
Solid Phase ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Synthesis Conditions ◽  
Two Dimensional Model ◽  
Thermal Phenomena

Two-dimensional model of sintering Ti and Cu powders substrate under controlled heating, taking into account the kinetic and thermal phenomena are proposed and studied. The base is ceramic. The system of chemical reactions is written according to the phase diagram of Ti-Cu. The model takes into account that the chemical reactions are slowed layer product. The problem is solved numerically. The temperature distribution and concentration of elements or compounds at different times for different synthesis conditions are determined. It is shown that at any process organization the synthesized material becomes chemically heterogeneous.

scholarly journals Study on the Separate Characteristics of Oil Spill Driven by Combined Water and Wind in Braided Rivers

2018 ◽  
Vol 246 ◽  
pp. 01118
Author(s):  
Jie Mu ◽  
Xiaoqing Liu ◽  
Chao Ma ◽  
Binbin Wu ◽  
Ruozhu Shen ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Oil Pollution ◽  
Velocity Ratio ◽  
Flux Ratio ◽  
Quantitative Relationship ◽  
Particle Model ◽  
Wind Effect ◽  
Width Ratio ◽  
Two Dimensional ◽  
Braided Rivers

In general, there are many bifurcations in natural rivers. When the oil spilled accident occurred at the upstream of bifurcation and was not controlled in time, the pollution scale would be expanded and the treatment would become harder as the oil slick entered into braided river driven by combined water and wind. To Study the separate law at the bifurcation in rivers, a two-dimensional numerical simulation model of oil spilled was established by oil particle model theory on the basis of two-dimensional hydrodynamic model. The quantitative relationship between the oil separate ratio and the flux ratio, velocity ratio, width ratio was obtained driven by water. The wind effect on the proportion of oil separate was also discussed based on the oil spilled numerical simulation. This study will provide technical support for forecast and response of oil pollution in braided rivers.

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.

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