Design and application of covalent organic frameworks for ionic conduction

2021 ◽  
Author(s):  
Xiuyu Zhao ◽  
Yao Chen ◽  
Zhifang Wang ◽  
Zhenjie Zhang
Keyword(s):  
Ionic Conduction ◽  
Porous Polymers ◽  
Porous Structures ◽  
Covalent Organic Frameworks ◽  
New Class ◽  
Ordered Porous ◽  
Design And Application

Covalent organic frameworks (COFs) are a new class of crystalline porous polymers that have received extensive attention from researchers in various backgrounds. Attributed to their highly ordered porous structures, outstanding...

scholarly journals Constructing covalent organic frameworks in waterviadynamic covalent bonding

IUCrJ ◽  
2016 ◽  
Vol 3 (6) ◽  
pp. 402-407 ◽  
Author(s):  
Jayshri Thote ◽  
Harshitha Barike Aiyappa ◽  
Raya Rahul Kumar ◽  
Sharath Kandambeth ◽  
Bishnu P. Biswal ◽  
...  
Keyword(s):  
Schiff Base ◽  
Covalent Bonding ◽  
Porous Polymers ◽  
Porous Structures ◽  
Covalent Organic Frameworks ◽  
Synthetic Route ◽  
Dynamic Covalent Chemistry ◽  
Water Based ◽  
First Time ◽  
Reaction In Water

The formation of keto-enamine based crystalline, porous polymers in water is investigated for the first time. Facile access to the Schiff base reaction in water has been exploited to synthesize stable porous structures using the principles of Dynamic Covalent Chemistry (DCC). Most credibly, the water-based Covalent Organic Frameworks (COFs) possess chemical as well as physical properties such as crystallinity, surface area and porosity, which is comparable to their solvothermal counterparts. The formation of COFs in water is further investigated by understanding the nature of the monomers formed using hydroxy and non-hydroxy analogues of the aldehyde. This synthetic route paves a new way to synthesize COFs using a viable, greener route by utilization of the DCC principles in conjunction with the keto–enol tautomerism to synthesize useful, stable and porous COFs in water.

Superhydrophobic polyaniline hollow spheres with mesoporous brain-like convex-fold shell textures

2015 ◽  
Vol 3 (38) ◽  
pp. 19299-19303 ◽  
Author(s):  
Ruixia Yuan ◽  
Huaiyuan Wang ◽  
Tuo Ji ◽  
Liwen Mu ◽  
Long Chen ◽  
...  
Keyword(s):  
Surface Energy ◽  
Phase Transfer ◽  
Hollow Spheres ◽  
Perfluorooctanoic Acid ◽  
Porous Structures ◽  
Low Surface Energy ◽  
Transfer Method ◽  
Ordered Porous

A novel micelle-mediated phase transfer method is developed to synthesize hollow polyaniline spheres with mesoporous brain-like convex-fold shell textures. High superhydrophobicity is achieved due to the highly ordered porous structures and low surface energy provided by perfluorooctanoic acid.

Heteropore covalent organic frameworks: a new class of porous organic polymers with well-ordered hierarchical porosities

2018 ◽  
Vol 5 (22) ◽  
pp. 3341-3356 ◽  
Author(s):  
Rong-Ran Liang ◽  
Xin Zhao
Keyword(s):  
Covalent Organic Frameworks ◽  
Organic Polymers ◽  
Porous Organic Polymers ◽  
New Class

This review highlights the development of heteropore covalent organic frameworks, a new class of porous organic polymers which exhibit well-ordered heterogeneous/hierarchical porosities.

Smart Processing of Solid Electrolyte Dendrites with Ordered Porous Structures for Fuel Cell Miniaturizations

2011 ◽  
Vol 2011 (CICMT) ◽  
pp. 000017-000022
Author(s):  
Soshu Kirihara ◽  
Katsuya Noritake ◽  
Satoko Tasaki ◽  
Hiroya Abe
Keyword(s):  
Fuel Cell ◽  
Solid Electrolyte ◽  
Solid Electrolytes ◽  
Yttria Stabilized Zirconia ◽  
Porous Structures ◽  
Stabilized Zirconia ◽  
Coordination Numbers ◽  
Aspect Ratios ◽  
Micro Patterning ◽  
Ordered Porous

Solid electrolyte dendrites of yttria stabilized zirconia with spatially ordered porous structures were successfully fabricated for fuel cell miniaturizations by using micro patterning stereolithography. Micrometer order ceramic lattices with the coordination numbers 4, 6, 8 and 12 were propagated spatially in computer graphic space. Aspect ratios of the lattice diameters and lengths were designed between 1.0 and 2.0 to value the porosities in higher levels from 50 to 80 %. On the fabrication process, nanometer sized yttria stabilized zirconia were dispersed in to photo sensitive liquid resins at 30 % in volume fraction to obtain thixotropic slurries. The paste material was spread on a grass substrate with 10 μm in layer thickness by using mechanic knife edge movements, and an ultra violet micro pattern was exposed on the surface to create cross sectional solid layer with 2 μm in part accuracy. After the layer stacking process, the ceramic dispersed resin lattices of 100 μm in diameter were obtained exactly. These composite precursors were dewaxed and sintered at 600 and 1500 °C in an air atmosphere, respectively, and the fine ceramic lattices of 98 % in relative density were created. Gaseous fluid profiles and pressure distributions in the formed ceramic lattices with the various coordination numbers and porosity percents were visualized and analyzed by using finite element method. The fabricated solid electrolytes with the extremely high porosities and wide surface areas are expect to be applied to novel electrodes in the compact fuel cells. The smart processing of the solid electrolytes by utilizing computer aided design, manufacturing and evaluation methods will be demonstrated.

Partially ordered porous structures on layer‐by‐layer polyaniline/poly(vinyl sulfate sodium) ultrathin films: Easy fabrication of robust submicroscopic patterning

2019 ◽  
Vol 137 (17) ◽  
pp. 48597
Author(s):  
A. M. A. Faria ◽  
M. A. Miranda ◽  
G. E. Gonçalves ◽  
R. F. Bianchi ◽  
A. G. C. Bianchi ◽  
...  
Keyword(s):  
Ultrathin Films ◽  
Layer By Layer ◽  
Porous Structures ◽  
Partially Ordered ◽  
Ordered Porous

3D ordered porous SnO2 with a controllable pore diameter for enhanced formaldehyde sensing performance

2020 ◽  
Vol 13 (07) ◽  
pp. 2051044
Author(s):  
Dan Sun ◽  
Huixiao Guo ◽  
Yu Li ◽  
Haiying Li ◽  
Xiaosong Li ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Porous Structures ◽  
Gas Sensitivity ◽  
Long Term Stability ◽  
Response Recovery ◽  
Recovery Times ◽  
Formaldehyde Sensing ◽  
Different Diameters ◽  
Ordered Porous

This paper reports the preparation of 3D ordered porous SnO2 with different diameters (103, 546, and 1030[Formula: see text]nm) by a simple template method. We find that 103[Formula: see text]nm porous SnO2 nanomaterials have the highest response (30) and fastest response/recovery time (3/10 s) for 100 ppm HCHO (formaldehyde) compared with the response and response/recovery times for 546 nm (20 and 3/17[Formula: see text]s, respectively) and 1030 nm (10 and 6/20[Formula: see text]s, respectively) porous SnO2 nanomaterials at a low working temperature (220∘C). All three sensors show good long-term stability, repeatability, and linearity. The results show that decreasing the diameter of the porous SnO2 materials effectively increased the gas sensitivity to HCHO. The increase in the gas sensitivity was attributed to the ordered porous structures, large specific surface area, and additional oxygen vacancies on the surface.

Ordered Porous Polymers

Science ◽  
1999 ◽  
Vol 283 (5400) ◽  
pp. 297d-297
Keyword(s):  
Porous Polymers ◽  
Ordered Porous

Convective combustion of ordered porous structures

1987 ◽  
Vol 22 (4) ◽  
pp. 410-414
Author(s):  
V. A. Arkhipov ◽  
V. N. Vilyunov ◽  
E. A. Kozlov ◽  
Vl. F. Trofimov
Keyword(s):  
Porous Structures ◽  
Convective Combustion ◽  
Ordered Porous

Covalent Organic Frameworks in Separation

2020 ◽  
Vol 11 (1) ◽  
pp. 131-153
Author(s):  
Saikat Das ◽  
Jie Feng ◽  
Wei Wang
Keyword(s):  
Green Revolution ◽  
Clean Energy ◽  
Chiral Separations ◽  
Porous Polymers ◽  
Future Research ◽  
Covalent Organic Frameworks ◽  
Separation Processes ◽  
Materials Research ◽  
Organic Solvent Nanofiltration ◽  
New Generation

In the wake of sustainable development, materials research is going through a green revolution that is putting energy-efficient and environmentally friendly materials and methods in the limelight. In this quest for greener alternatives, covalent organic frameworks (COFs) have emerged as a new generation of designable crystalline porous polymers for a wide array of clean-energy and environmental applications. In this contribution, we categorically review the merits and shortcomings of COF bulk powders, nanosheets, freestanding thin films/membranes, and membranes on porous supports in various separation processes, including separation of gases, pervaporation, organic solvent nanofiltration, water purification, radionuclide sequestration, and chiral separations, with particular reference to COF material pore size, host–guest interactions, stability, selectivity, and permeability. This review covers the fabrication strategies of nanosheets, films, and membranes, as well as performance parameters, and provides an overview of the separation landscape with COFs in relation to other porous polymers, while seeking to interpret the future research opportunities in this field.

Rational synthesis of isomorphic rare earth metal-organic framework materials for simultaneous adsorption and photocatalytic degradation of organic dyes in water

CrystEngComm ◽  
2021 ◽  
Author(s):  
Meng-Ting Hang ◽  
Yi Cheng ◽  
Yi-Tong Wang ◽  
Huan Li ◽  
Meng-Qi Zheng ◽  
...  
Keyword(s):  
Active Sites ◽  
Organic Dyes ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Earth Metal ◽  
Dye Wastewater ◽  
Porous Structures ◽  
Framework Materials ◽  
Metal Organic ◽  
Ordered Porous

In recent years, the treatment of dye wastewater has attracted widespread attention. Metal-organic frameworks (MOFs) adopt ordered porous structures and abundant active sites, which endorses them promising photocatalysts for the...

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