scholarly journals Diffusion-induced in situ growth of covalent organic frameworks for composite membranes

2019 ◽  
Vol 7 (45) ◽  
pp. 25802-25807 ◽  
Author(s):  
Priyanka Manchanda ◽  
Stefan Chisca ◽  
Lakshmeesha Upadhyaya ◽  
Valentina-Elena Musteata ◽  
Mark Carrington ◽  
...  
Keyword(s):  
Reaction Times ◽  
Composite Membranes ◽  
Thin Layers ◽  
In Situ Growth ◽  
Covalent Organic Frameworks ◽  
Polymeric Support ◽  
Ambient Conditions ◽  
Induction Method ◽  
Covalent Organic Framework

Thin layers of a covalent organic framework (COF) have been synthesized on a flexible polymeric support using a new diffusion-induction method under ambient conditions in reaction times as short as 3 hours.

A π-electronic covalent organic framework catalyst: π-walls as catalytic beds for Diels–Alder reactions under ambient conditions

2015 ◽  
Vol 51 (50) ◽  
pp. 10096-10098 ◽  
Author(s):  
Yang Wu ◽  
Hong Xu ◽  
Xiong Chen ◽  
Jia Gao ◽  
Donglin Jiang
Keyword(s):  
Heterogeneous Catalysts ◽  
Diels Alder ◽  
Covalent Organic Frameworks ◽  
Ambient Conditions ◽  
Covalent Organic Framework ◽  
Organic Framework

Covalent organic frameworks were developed as heterogeneous catalysts to explore their π-walls as catalytic beds that enabled Diels–Alder reactions under ambient conditions.

scholarly journals A comparison between Zooglider and shipboard net and acoustic mesozooplankton sensing systems

2019 ◽  
Vol 41 (4) ◽  
pp. 521-533 ◽  
Author(s):  
Benjamin M Whitmore ◽  
Catherine F Nickels ◽  
Mark D Ohman
Keyword(s):  
Optical Imaging ◽  
Imaging System ◽  
Relative Magnitude ◽  
Thin Layers ◽  
Ambient Conditions ◽  
Frequency Distributions ◽  
Sensing Systems ◽  
Vertical Scale ◽  
Optical Imaging System

Abstract Some planktonic patches have markedly higher concentrations of organisms compared to ambient conditions and are <5 m in thickness (i.e. thin layers). Conventional net sampling techniques are unable to resolve this vertical microstructure, while optical imaging systems can measure it for limited durations. Zooglider, an autonomous zooplankton-sensing glider, uses a low-power optical imaging system (Zoocam) to resolve mesozooplankton at a vertical scale of 5 cm while making concurrent physical and acoustic measurements (Zonar). In March 2017, Zooglider was compared with traditional nets (MOCNESS) and ship-based acoustics (Simrad EK80). Zoocam recorded significantly higher vertically integrated abundances of smaller copepods and appendicularians, and larger gelatinous predators and mineralized protists, but similar abundances of chaetognaths, euphausiids, and nauplii. Differences in concentrations and size-frequency distributions are attributable to net extrusion and preservation artifacts, suggesting advantages of in situ imaging of organisms by Zooglider. Zoocam detected much higher local concentrations of copepods and appendicularians (53 000 and 29 000 animals m−3, respectively) than were resolvable by nets. The EK80 and Zonar at 200 kHz agreed in relative magnitude and distribution of acoustic backscatter. The profiling capability of Zooglider allows for deeper high-frequency acoustic sampling than conventional ship-based acoustics.

Synthesis of Imine-Based Covalent Organic Frameworks Catalyzed by Metal Halides and in Situ Growth of Perovskite@COF Composites

2020 ◽  
Vol 2 (12) ◽  
pp. 1561-1566
Author(s):  
Yifeng Liu ◽  
Yifan Zhu ◽  
Sampath B. Alahakoon ◽  
Eilaf Egap
Keyword(s):  
In Situ Growth ◽  
Covalent Organic Frameworks ◽  
Metal Halides

Influence of Hydrothermal Conditions on Ultra-Light Calcium Silicate Material In Situ Strengthened with Xonotlite Whiskers

2013 ◽  
Vol 648 ◽  
pp. 139-142
Author(s):  
Fei Liu ◽  
Ting Li ◽  
Xiao Dan Wang ◽  
Jian Xin Cao
Keyword(s):  
Hydrothermal Synthesis ◽  
Physical Properties ◽  
Calcium Silicate ◽  
Reaction Times ◽  
In Situ Growth ◽  
Silicate Material ◽  
Hydrothermal Conditions ◽  
Hydrothermal Temperature

The ultra-light calcium silicate material was reinforced with the method of xonotlite whisker in-situ growth via hydrothermal synthesis. Effects of different hydrothermal temperatures and reaction times on the microstructure and physical properties of the reinforcement were studied in this paper. The results indicated that the hydrothermal temperatures and times posed great impacts on microstructure of the reinforcement. The increase of hydrothermal temperature and time was beneficial to the growth of xonotlite crystal. The effect of buffer and transfer action of the xonotlite whiskers was the key to reinforcing the ultra-light calcium silicate material.

scholarly journals A covalent organic framework-based route to the in situ encapsulation of metal nanoparticles in N-rich hollow carbon spheres

2016 ◽  
Vol 7 (9) ◽  
pp. 6015-6020 ◽  
Author(s):  
Liyu Chen ◽  
Lei Zhang ◽  
Zhijie Chen ◽  
Hongli Liu ◽  
Rafael Luque ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Hollow Structure ◽  
Catalytic Performance ◽  
Hybrid Nanocomposites ◽  
Covalent Organic Frameworks ◽  
Carbon Spheres ◽  
Covalent Organic Framework ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

Covalent organic frameworks doped with metal cations can be used as novel precursors for the in situ encapsulation of metal NPs into N doped hollow carbon spheres. The integration of the hollow structure, N dopant and ultrafine Pd NPs gives the hybrid nanocomposites advanced catalytic performance.

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