scholarly journals Radiation-initiated high strength chitosan/lithium sulfonate double network hydrogel/aerogel with porosity and stability for efficient CO2 capture

RSC Advances ◽  
2021 ◽  
Vol 11 (33) ◽  
pp. 20486-20497
Author(s):  
Zhiyan Liu ◽  
Rui Ma ◽  
Wenjie Du ◽  
Gang Yang ◽  
Tao Chen
Keyword(s):  
Aqueous Solution ◽  
High Strength ◽  
Beam Radiation ◽  
Chitosan Hydrogel ◽  
Double Network ◽  
Electron Beam Radiation ◽  
Freeze Dried ◽  
Urea Aqueous Solution ◽  
Capture Capacity

Chitosan hydrogel is regenerated from alkali/urea aqueous solution and the lithium sulfonate second network is introduced by electron beam radiation-initiated in situ free radical polymerization. The freeze-dried aerogel has CO2 capture capacity.

High-Resolution EM of Colloidal Nanocrystal Growth Using Graphene Liquid Cells

Science ◽  
2012 ◽  
Vol 336 (6077) ◽  
pp. 61-64 ◽  
Author(s):  
Jong Min Yuk ◽  
Jungwon Park ◽  
Peter Ercius ◽  
Kwanpyo Kim ◽  
Daniel J. Hellebusch ◽  
...  
Keyword(s):  
Beam Radiation ◽  
Electron Beam Radiation ◽  
Nanocrystal Growth ◽  
Transmission Electron ◽  
Colloidal Platinum ◽  
New Type ◽  
Liquid Cell ◽  
Resolution Imaging ◽  
Site Selective

We introduce a new type of liquid cell for in situ transmission electron microscopy (TEM) based on entrapment of a liquid film between layers of graphene. The graphene liquid cell facilitates atomic-level resolution imaging while sustaining the most realistic liquid conditions achievable under electron-beam radiation. We employ this cell to explore the mechanism of colloidal platinum nanocrystal growth. Direct atomic-resolution imaging allows us to visualize critical steps in the process, including site-selective coalescence, structural reshaping after coalescence, and surface faceting.

Effect of NaOH/urea solution on enhancing grease resistance and strength of paper

2014 ◽  
Vol 29 (2) ◽  
pp. 246-252 ◽  
Author(s):  
Jinxia Ma ◽  
Xiaofan Zhou ◽  
Huining Xiao ◽  
Yi Zhao
Keyword(s):  
Aqueous Solution ◽  
Tensile Strength ◽  
Weight Ratio ◽  
High Strength ◽  
Cellulose Fibers ◽  
Urea Solution ◽  
Compact Structure ◽  
Fixed Temperature ◽  
Burst Strength ◽  
Urea Aqueous Solution

Abstract A new way as shown in the following scheme was developed to fabricate paper with high strength and grease resistance. Filter paper was impregnated in NaOH/urea aqueous solution pre-cooled to -12°C for 30 s and incubated at a fixed temperature for a period of time. Swelling and dissolution of cellulose fibers facilitated more compact structure of paper and higher strength. Various influencing factors were investigated in an attempt to improve grease resistance of the paper. The results demonstrated that the paper after treatment showed a 100% grease barrier property within 24 h, and a double increase in both tensile strength and tear strength compared with the untreated paper. Moreover, burst strength was enhanced more than three times and the stretch was improved simultaneously when the paper was performed with NaOH/urea (7%:12% weight ratio) at -12°C for 120 min. In addition, the wet tensile strength of the treated paper was close to the dry tensile strength of the untreated paper.

scholarly journals Degradation of profenofos in aqueous solution and in vegetable sample by electron beam radiation

2020 ◽  
Vol 166 ◽  
pp. 108441 ◽  
Author(s):  
Flavio Thihara Rodrigues ◽  
Eric Marchioni ◽  
Sonia Lordel-Madeleine ◽  
Florent Kuntz ◽  
Anna Lucia Casañas Haasis Villavicencio ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Electron Beam ◽  
Beam Radiation ◽  
Electron Beam Radiation ◽  
Vegetable Sample

scholarly journals MWCNTs/Cellulose Hydrogels Prepared from NaOH/Urea Aqueous Solution with Improved Mechanical Properties

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Yingpu Zhang ◽  
Rong Huang ◽  
Si Peng ◽  
Zhaocheng Ma
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Aqueous Solution ◽  
Functional Materials ◽  
High Strength ◽  
Mechanical Analysis ◽  
Multiwalled Carbon ◽  
Composite Hydrogels ◽  
Urea Aqueous Solution ◽  
Equilibrium Swelling Ratio

Novel high strength composite hydrogels were designed and synthesized by introducing multiwalled carbon nanotubes (MWCNTs) into cellulose/NaOH/urea aqueous solution and then cross-linked by epichlorohydrin. MWCNTs were used to modify the matrix of cellulose. The structure and morphology of the hydrogels were characterized by Fourier transform infrared (FT-IR) spectroscopy, high resolution transmission electron microscopy (HR-TEM), and scanning electron microscopy (SEM). The results from swelling testing revealed that the equilibrium swelling ratio of hydrogels decreased with the increment of MWCNTs content. Thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA) results demonstrated that the introduction of MWCNT into cellulose hydrogel networks remarkably improved both thermal and mechanical properties of the composite hydrogels. The preparation of MWCNTs modifiedcellulose-based composites with improved mechanical properties was the first important step towards the development of advanced functional materials.

In situ REM imaging of surface processes on ceramic bulk crystals from 300 to 1670 K in a conventional TEM

1991 ◽  
Vol 49 ◽  
pp. 660-661
Author(s):  
Z. L. Wang ◽  
J. Bentley
Keyword(s):  
High Temperatures ◽  
Image Resolution ◽  
Atomic Processes ◽  
Crystal Surfaces ◽  
Beam Radiation ◽  
Surface Areas ◽  
Transmission Electron ◽  
Reflection Electron Microscopy ◽  
Gas Reactions

Studying the behavior of surfaces at high temperatures is of great importance for understanding the properties of ceramics and associated surface-gas reactions. Atomic processes occurring on bulk crystal surfaces at high temperatures can be recorded by reflection electron microscopy (REM) in a conventional transmission electron microscope (TEM) with relatively high resolution, because REM is especially sensitive to atomic-height steps.Improved REM image resolution with a FEG: Cleaved surfaces of a-alumina (012) exhibit atomic flatness with steps of height about 5 Å, determined by reference to a screw (or near screw) dislocation with a presumed Burgers vector of b = (1/3)<012> (see Fig. 1). Steps of heights less than about 0.8 Å can be clearly resolved only with a field emission gun (FEG) (Fig. 2). The small steps are formed by the surface oscillating between the closely packed O and Al stacking layers. The bands of dark contrast (Fig. 2b) are the result of beam radiation damage to surface areas initially terminated with O ions.

In situ observation of the martensitic transformation in (Mg,Y)-PSZ

1986 ◽  
Vol 44 ◽  
pp. 500-501
Author(s):  
R-R. Lee
Keyword(s):  
Martensitic Transformation ◽  
High Strength ◽  
Nucleation And Growth ◽  
In Situ Observation ◽  
Considerable Potential ◽  
Transmission Electron ◽  
Structural Applications ◽  
Applied Stresses ◽  
Kinetics Of

Partially-stabilized ZrO2 (PSZ) ceramics have considerable potential for advanced structural applications because of their high strength and toughness. These properties derive from small tetragonal ZrO2 (t-ZrO2) precipitates in a cubic (c) ZrO2 matrix, which transform martensitically to monoclinic (m) symmetry under applied stresses. The kinetics of the martensitic transformation is believed to be nucleation controlled and the nucleation is always stress induced. In situ observation of the martensitic transformation using transmission electron microscopy provides considerable information about the nucleation and growth aspects of the transformation.

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