scholarly journals Synthesis of distorted nanographenes containing seven- and eight-membered carbocycles

2018 ◽  
Vol 54 (50) ◽  
pp. 6705-6718 ◽  
Author(s):  
Irene R. Márquez ◽  
Silvia Castro-Fernández ◽  
Alba Millán ◽  
Araceli G. Campaña
Keyword(s):  
Recent Progress ◽  
Polyaromatic Hydrocarbons ◽  
Bottom Up

We highlight recent progress in bottom-up synthesis of well-defined distorted polyaromatic hydrocarbons with saddle shapes containing heptagonal and octagonal carbocycles.

Recent progress in g-C3N4 quantum dots: synthesis, properties and applications in photocatalytic degradation of organic pollutants

2020 ◽  
Vol 8 (2) ◽  
pp. 485-502 ◽  
Author(s):  
Teng Wang ◽  
Chunyang Nie ◽  
Zhimin Ao ◽  
Shaobin Wang ◽  
Taicheng An
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Recent Progress ◽  
Top Down ◽  
Bottom Up ◽  
Synthesis Properties ◽  
Catalytic Removal

Graphitic-C3N4 quantum dots (g-C3N4QDs), which can be prepared by top-down and bottom-up synthesis, exhibit excellent optical features. They can act as different roles during the photo(electro)catalytic removal of organic pollutants.

scholarly journals Bottom-Up Approaches to Synthetic Cooperation in Microbial Communities

Life ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 22 ◽  
Author(s):  
Daniel Rodríguez Amor ◽  
Martina Dal Bello
Keyword(s):  
Microbial Communities ◽  
Recent Progress ◽  
Population Level ◽  
Single Species ◽  
Major Question ◽  
Bottom Up ◽  
Microbial Ecosystems ◽  
Ecological Scales ◽  
Theoretical Predictions ◽  
The Stability

Microbial cooperation pervades ecological scales, from single-species populations to host-associated microbiomes. Understanding the mechanisms promoting the stability of cooperation against potential threats by cheaters is a major question that only recently has been approached experimentally. Synthetic biology has helped to uncover some of these basic mechanisms, which were to some extent anticipated by theoretical predictions. Moreover, synthetic cooperation is a promising lead towards the engineering of novel functions and enhanced productivity of microbial communities. Here, we review recent progress on engineered cooperation in microbial ecosystems. We focus on bottom-up approaches that help to better understand cooperation at the population level, progressively addressing the challenges of tackling higher degrees of complexity: spatial structure, multispecies communities, and host-associated microbiomes. We envisage cooperation as a key ingredient in engineering complex microbial ecosystems.

Recent Progress in Titanium Silicide Nanowires: Properties, Preparations and Applications

2013 ◽  
Vol 446-447 ◽  
pp. 50-54
Author(s):  
Jun Du ◽  
Jiao Liu ◽  
Hua Qiang Fu ◽  
Bu Hui Li ◽  
Qi Wu
Keyword(s):  
Recent Progress ◽  
Electrode Materials ◽  
Rapid Development ◽  
Titanium Silicide ◽  
Top Down ◽  
Bottom Up ◽  
Recent Advances ◽  
Potential Applications

The rapid development of nanotechnology has opened up multiple areas of application of titanium silicide nanowires including microscopic fields, sensor and catalyst areas and electrode materials, as well as their potential applications in nanodevices. The preparation of titanium silicide nanowires can be summarized as top-down method and bottom-up method. Its necessary to find some simple and quick ways to prepare titanium silicide nanowires with the desirable pattern. Recent advances in manipulating titanium silicide nanowires are discussed with a focus on the progress of nanowire preparations and applications.

scholarly journals Bottom-Up Fabrication of DNA-Templated Electronic Nanomaterials and Their Characterization

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1655
Author(s):  
Chao Pang ◽  
Basu R. Aryal ◽  
Dulashani R. Ranasinghe ◽  
Tyler R. Westover ◽  
Asami E. F. Ehlert ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Drug Delivery ◽  
Recent Progress ◽  
Electronic Device ◽  
Electrical Characterization ◽  
Dna Nanostructures ◽  
Dna Templates ◽  
Bottom Up ◽  
Significant Potential ◽  
The Creation

Bottom-up fabrication using DNA is a promising approach for the creation of nanoarchitectures. Accordingly, nanomaterials with specific electronic, photonic, or other functions are precisely and programmably positioned on DNA nanostructures from a disordered collection of smaller parts. These self-assembled structures offer significant potential in many domains such as sensing, drug delivery, and electronic device manufacturing. This review describes recent progress in organizing nanoscale morphologies of metals, semiconductors, and carbon nanotubes using DNA templates. We describe common substrates, DNA templates, seeding, plating, nanomaterial placement, and methods for structural and electrical characterization. Finally, our outlook for DNA-enabled bottom-up nanofabrication of materials is presented.

Electron-Mirror Microscopic Aspects of Ferroelectric Domains of BaTiO3 And Ca2Sr (C2H5CO2)6

1970 ◽  
Vol 28 ◽  
pp. 478-479
Author(s):  
Teruo Someya ◽  
Jinzo Kobayashi
Keyword(s):  
Surface Layer ◽  
Electric Fields ◽  
Quantitative Study ◽  
Recent Progress ◽  
Ferroelectric Domain ◽  
Resolving Power ◽  
Surface Pattern ◽  
Crystal Surfaces ◽  
One Dimensional ◽  
Ferroelectric Domains

Recent progress in the electron-mirror microscopy (EMM), e.g., an improvement of its resolving power together with an increase of the magnification makes it useful for investigating the ferroelectric domain physics. English has recently observed the domain texture in the surface layer of BaTiO3. The present authors ) have developed a theory by which one can evaluate small one-dimensional electric fields and/or topographic step heights in the crystal surfaces from their EMM pictures. This theory was applied to a quantitative study of the surface pattern of BaTiO3).

The Nature of Oxide Surfaces: Topographic and Electronic Structure

1993 ◽  
Vol 51 ◽  
pp. 966-967
Author(s):  
Dawn A. Bonnell ◽  
Yong Liang
Keyword(s):  
Transition Metal Oxides ◽  
Electronic Structures ◽  
Recent Progress ◽  
Spatial Localization ◽  
Level Of Detail ◽  
Scanning Tunneling ◽  
Oxide Surfaces ◽  
Tunneling Microscopy ◽  
Considerable Effort ◽  
Complete Understanding

Recent progress in the application of scanning tunneling microscopy (STM) and tunneling spectroscopy (STS) to oxide surfaces has allowed issues of image formation mechanism and spatial resolution limitations to be addressed. As the STM analyses of oxide surfaces continues, it is becoming clear that the geometric and electronic structures of these surfaces are intrinsically complex. Since STM requires conductivity, the oxides in question are transition metal oxides that accommodate aliovalent dopants or nonstoichiometry to produce mobile carriers. To date, considerable effort has been directed toward probing the structures and reactivities of ZnO polar and nonpolar surfaces, TiO2 (110) and (001) surfaces and the SrTiO3 (001) surface, with a view towards integrating these results with the vast amount of previous surface analysis (LEED and photoemission) to build a more complete understanding of these surfaces. However, the spatial localization of the STM/STS provides a level of detail that leads to conclusions somewhat different from those made earlier.

Psychology and Culture: Top Down Versus Bottom Up?

PsycCRITIQUES ◽  
2005 ◽  
Vol 50 (19) ◽  
Author(s):  
Michael Cole
Keyword(s):  
Top Down ◽  
Bottom Up
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