scholarly journals Water-Phase Synthesis of Ultrathin Au Nanowires with a Two-Dimensional Parallel Array Structure

2020 ◽  
Vol 93 (11) ◽  
pp. 1372-1377
Author(s):  
Naoya Miyajima ◽  
Yung-Chen Wang ◽  
Makoto Nakagawa ◽  
Hiroki Kurata ◽  
Yoshiro Imura ◽  
...  
Keyword(s):  
Water Phase ◽  
Two Dimensional ◽  
Phase Synthesis ◽  
Parallel Array ◽  
Array Structure ◽  
Au Nanowires

Solution-phase synthesis of two-dimensional silica nanosheets using soft templates and their applications in CO2 capture

Nanoscale ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 5365-5376 ◽  
Author(s):  
Baljeet Singh ◽  
Vivek Polshettiwar
Keyword(s):  
Co2 Capture ◽  
Textural Properties ◽  
Solution Phase ◽  
Soft Template ◽  
Two Dimensional ◽  
Phase Synthesis ◽  
Solution Phase Synthesis ◽  
Capture Capacity ◽  
Soft Templates

The synthesis of 2D silica nanosheets using a soft template with tunable thickness and textural properties is achieved. When functionalized with amines, they showed good CO2 capture capacity and sorbent stability.

scholarly journals Transmit and Receive Array Structure Design of Two-Dimensional hybrid Phased-MIMO Radar based on Nested Array

2018 ◽  
Vol 232 ◽  
pp. 02052
Author(s):  
Tianhao Cheng ◽  
Buhong Wang ◽  
Qiaoge Liu ◽  
Jiwei Tian
Keyword(s):  
Design Method ◽  
Doa Estimation ◽  
Mimo Radar ◽  
Structure Design ◽  
Estimation Accuracy ◽  
Two Dimensional ◽  
Simulation Experiments ◽  
Virtual Array ◽  
Array Structure ◽  
Receive Array

In order to reduce the loss of Degree of Freedom (DOF) brought by the transmit subarray splitting of two-dimensional hybrid phased-MIMO radar, this paper presents a design method of transmitting and receiving array based on nested array structure. Firstly, a two-dimensional hybrid phased-MIMO radar transmitting array based on one-dimensional nested array is presented. On this basis, the receiving end is set as a nested array, and finally a virtual array and difference coarray are formed to expand the number of virtual array elements. The expansion increases the DOF of arrays while preserving the advantages of hybrid phased-MIMO radars. Simulation experiments show that compared with the traditional and coprime hybrid phased-MIMO radar, the proposed method can effectively improve the array DOF and Direction-of-Arrival (DOA) estimation accuracy.

CHARACTERIZING THE ABILITY OF PARALLEL ARRAY GENERATORS ON REVERSIBLE PARTITIONED CELLULAR AUTOMATA

1999 ◽  
Vol 13 (04) ◽  
pp. 523-538 ◽  
Author(s):  
KENICHI MORITA ◽  
SATOSHI UENO ◽  
KATSUNOBU IMAI
Keyword(s):  
Pattern Recognition ◽  
Cellular Automata ◽  
Cellular Automaton ◽  
Inverse System ◽  
Two Dimensional ◽  
Turing Machines ◽  
Recognition Mechanism ◽  
Parallel Array ◽  
Parallel Pattern ◽  
Monotonic Constraint

A PCAAG introduced by Morita and Ueno is a parallel array generator on a partitioned cellular automaton (PCA) that generates an array language (i.e. a set of symbol arrays). A "reversible" PCAAG (RPCAAG) is a backward deterministic PCAAG, and thus parsing of two-dimensional patterns can be performed without backtracking by an "inverse" system of the RPCAAG. Hence, a parallel pattern recognition mechanism on a deterministic cellular automaton can be directly obtained from a RPCAAG that generates the pattern set. In this paper, we investigate the generating ability of RPCAAGs and their subclass. It is shown that the ability of RPCAAGs is characterized by two-dimensional deterministic Turing machines, i.e. they are universal in their generating ability. We then investigate a monotonic RPCAAG (MRPCAAG), which is a special type of an RPCAAG that satisfies monotonic constraint. We show that the generating ability of MRPCAAGs is exactly characterized by two-dimensional deterministic linear-bounded automata.

scholarly journals Water-Phase Synthesis of Cationic Silica/Polyamine Nanoparticles

2012 ◽  
Vol 24 (8) ◽  
pp. 1426-1433 ◽  
Author(s):  
Quang X. Nguyen ◽  
T. Grant Belgard ◽  
John J. Taylor ◽  
Vinit S. Murthy ◽  
Naomi J. Halas ◽  
...  
Keyword(s):  
Water Phase ◽  
Phase Synthesis

Preparation ZnS Quantum Dots via Water-Phase Synthesis Method

2013 ◽  
Vol 706-708 ◽  
pp. 230-233
Author(s):  
Wei Liu ◽  
Xian Lan Chen ◽  
Ju Cheng Zhang ◽  
Yun Hui Long ◽  
Ling Shi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ph Value ◽  
Synthesis Method ◽  
Emission Spectra ◽  
Water Phase ◽  
Complexing Agents ◽  
Complex Ions ◽  
Aqueous Synthesis ◽  
Phase Synthesis ◽  
Optimal Reaction

With water as the medium, PVP as stabilizer and ammonia as complexing agents and adjusting pH value of the solution, we report an all-aqueous synthesis of highly photoluminescent and stable ZnS quantum dots (QDs) by water-phase synthesis reaction between ZnCl2 and NaS at different temperatures and times. The optimal reaction conditions of PVP-capped ZnS QDs were obtained through experiment as follows: the concentration ZnCl2 and NaS solution both are 1 mM, (PVP):(ZnCl2) = 0.0167 (v/v), (NH3):(ZnCl2)=1:300 (v/v), the optimal reaction temperature is 40 °C, the optimal reaction time is 30 min. With ammonia as complexing agents, Zn(OH)2 can dissolve in ammonia and form to complex ions ((Zn(NH3)4)2+), which make Zn2+ release slowly to control the nucleus growth rate of ZnS, thus obtain small size of nanoparticles. The fluorescence spectra shows that the emission peaks of ZnS QDs around ~395 nm and ~470 nm on the emission spectra, which are consistent with literatures, so nano-ZnS QDs was synthesized successfully in this paper.

scholarly journals Modified MAX Phase Synthesis for Environmentally Stable and Highly Conductive Ti3C2 MXene

2020 ◽  
Author(s):  
Tyler Mathis ◽  
Kathleen Maleski ◽  
Adam Goad ◽  
Asia Sarycheva ◽  
Mark Anayee ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Shelf Life ◽  
Max Phase ◽  
Two Dimensional ◽  
Ambient Conditions ◽  
Phase Synthesis ◽  
Commercial Use ◽  
Aqueous Suspensions ◽  
Resistance To Oxidation ◽  
Phase Precursor

One of the primary factors limiting further research and the commercial use of the two-dimensional (2D) MXene titanium carbide (Ti3C2), as well as MXenes in general, is the rate at which freshly made samples oxidize and degrade when stored as aqueous suspensions. Here, we show that including excess aluminum during synthesis of the Ti3AlC2 MAX phase precursor leads to the creation of Ti3AlC2 grains with improved stoichiometry and crystallinity. Ti3C2 nanosheets produced from the improved Ti3AlC2 are of higher quality, as evidenced by their increased resistance to oxidation and an increase in their electrical conductivity to 20,000 S/cm. Our results indicate that defects created during the synthesis of Ti3C2 (and by inference, other MXenes) lead to the previously observed instability. We show that by eliminating those defects results in Ti3C2 that is highly stable in aqueous solutions and in air. Aqueous suspensions of single- to few-layer Ti3C2 flakes produced from the modified Ti3AlC2 have a shelf life of over ten months, compared to one to two weeks for Ti3C2 produced from conventional Ti3AlC2, even when stored in ambient conditions. Freestanding films made from Ti3C2 suspensions stored for ten months show minimal decreases in electrical conductivity and negligible oxidation. Oxidation of the improved Ti3C2 in air initiates at temperatures that are 100-150°C higher than conventional Ti3C2. The observed improvements in both the shelf life and properties of Ti3C2 will facilitate the widespread use of this material. <br>

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 Precise Vapor-Phase Synthesis of Two-Dimensional Atomic Single Crystals

iScience ◽  
2019 ◽  
Vol 20 ◽  
pp. 527-545 ◽  
Author(s):  
Shasha Zhao ◽  
Luyang Wang ◽  
Lei Fu
Keyword(s):  
Single Crystals ◽  
Vapor Phase ◽  
Two Dimensional ◽  
Phase Synthesis ◽  
Vapor Phase Synthesis
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