Ferrocene-based hyperbranched polymers: a synthetic strategy for shape control and applications as electroactive materials and precursor-derived magnetic ceramics

2020 ◽  
Vol 8 (31) ◽  
pp. 10774-10780
Author(s):  
Zhuoxun Wei ◽  
Dong Wang ◽  
Yurong Liu ◽  
Xuyun Guo ◽  
Ye Zhu ◽  
...  
Keyword(s):  
Shape Control ◽  
Hyperbranched Polymers ◽  
Topological Structures ◽  
Electroactive Materials ◽  
Magnetic Ceramics ◽  
Synthetic Strategy ◽  
Different Shapes

Ferrocene-based hyperbranched polymers were prepared with different shapes of spheres and hollow polyhedra, and the 3D topological structures were studied as electroactive materials and precursor-derived magnetic ceramics, respectively.

Shape control of silver selenide nanoparticles using green capping molecules

2017 ◽  
Vol 6 (2) ◽  
Author(s):  
Nokwethemba Precious Sibiya ◽  
Makwena Justice Moloto
Keyword(s):  
Shape Control ◽  
Orthorhombic Phase ◽  
Silver Selenide ◽  
Capping Agent ◽  
X Ray Diffraction ◽  
Synthesis Of Nanoparticles ◽  
Size And Shape ◽  
Transmission Electron ◽  
Different Shapes ◽  
Average Size

AbstractEmploying a capping agent during the synthesis of nanoparticles has been reported to play a role in controlling size and shape of the nanoparticles. Due to this reason, this study reports the synthesis of silver selenide nanoparticles using different environmentally friendly capping agents (green tea, glucose, ascorbic acid and chitosan) in order to investigate their effect on the size and shape of the nanoparticles. Transmission electron microscopy (TEM) results showed that the nanoparticles have different shapes (rods, spheres and cubes) with an average size of 8–96 nm depending on the capping agent used. Fourier transformer infrared (FTIR) spectroscopy confirmed that the capping of nanoparticles was successful, while X-ray diffraction (XRD) showed that the nanoparticles have an orthorhombic phase.

Multicomponent Polymerization of Alkynes, Sulfonyl Azide, and Iminophosphorane at Room Temperature for the Synthesis of Hyperbranched Poly(phosphorus amidine)s

Synlett ◽  
2018 ◽  
Vol 29 (19) ◽  
pp. 2523-2528 ◽  
Author(s):  
Rongrong Hu ◽  
Ben Tang ◽  
Liguo Xu ◽  
Kou Yang
Keyword(s):  
Metal Ions ◽  
Room Temperature ◽  
Platinum Group Metal ◽  
Hyperbranched Polymers ◽  
Synthetic Approach ◽  
Fluorescence Response ◽  
Topological Structures ◽  
Group Metal ◽  
Hyperbranched Poly ◽  
Sulfonyl Azide

The construction of functional hyperbranched polymers with unique topological structures and distinct properties remains a great challenge. Multicomponent polymerization, as a fascinating polymer synthetic approach, has proved to be a powerful tool for the synthesis of polymers with diverse structures and multifunctionalities, which is a great advantage for the preparation of hyperbranched polymers. In this work, a multicomponent polymerization of alkynes, sulfonyl azide, and iminophosphorane is utilized for the construction of heteroatom-rich hyperbranched poly(phosphorus amidine)s with different topological structures and fluorescence response toward platinum group metal ions.

scholarly journals A Variant Cubic Exponential B-Spline Scheme with Shape Control

Mathematics ◽  
2021 ◽  
Vol 9 (23) ◽  
pp. 3116
Author(s):  
Baoxing Zhang ◽  
Hongchan Zheng
Keyword(s):  
Shape Control ◽  
B Spline ◽  
Numerical Examples ◽  
Different Shapes ◽  
Two Parameters

This paper presents a variant scheme of the cubic exponential B-spline scheme, which, with two parameters, can generate curves with different shapes. This variant scheme is obtained based on the iteration from the generation of exponentials and a suitably chosen function. For such a scheme, we show its C2-convergence and analyze the effect of the parameters on the shape of the generated curves and also discuss its convexity preservation. In addition, a non-uniform version of this variant scheme is derived in order to locally control the shape of the generated curves. Numerical examples are given to illustrate the performance of the new schemes in this paper.

Synthesis and Shape Control of Copper Tin Sulphide Nanocrystals and Formation of Gold–Copper Tin Sulphide Hybrid Nanostructures

2014 ◽  
Vol 69 (8-9) ◽  
pp. 446-450 ◽  
Author(s):  
Marta Kruszynska ◽  
Jürgen Parisi ◽  
Joanna Kolny-Olesiak
Keyword(s):  
Shape Control ◽  
Growth Process ◽  
Hybrid Nanostructures ◽  
Copper Sulphide ◽  
Reaction Conditions ◽  
Hot Injection ◽  
Different Shapes ◽  
Injection Procedure

Hexagonal prismatic Cu3SnS4 nanoparticles and nanorods were synthesized by a hot-injection procedure. Changing the reaction conditions leads to the formation of different shapes. When oleylamine is used as a solvent, hexagonal prismatic particles are obtained, while a reaction in octadecene results in the formation of nanorods. The growth process of copper tin sulphide starts with the formation of djurleite copper sulphide seeds. Their reaction with Sn4+ ions leads to the formation of Cu3SnS4. These Cu3SnS4 nanocrystals form Au-Cu3SnS4 hybrid nanostructures by reaction with gold seeds

Diselenide-yne Polymerization for Multifunctional Selenium-containing Hyperbranched Polymers

2021 ◽  
Author(s):  
Xiaofang Lin ◽  
Sisi Chen ◽  
Weihong Lu ◽  
Ming Liu ◽  
Zhengbiao Zhang ◽  
...  
Keyword(s):  
Hyperbranched Polymers ◽  
Polymer Materials ◽  
Polymer Science ◽  
Topological Structures ◽  
New Strategies

Exploration of new strategies for the preparation of novel polymer materials with diverse topological structures and functions is a subject of enduring interest in the area of polymer science. In...

Surface Structures of Shape-Controlled Platinum Nanoparticles

1997 ◽  
Vol 3 (S2) ◽  
pp. 429-430
Author(s):  
Z.L. Wang ◽  
T.S. Ahmadi ◽  
J.M. Petroski ◽  
M.A. El-Sayed
Keyword(s):  
Electron Microscopy ◽  
Shape Control ◽  
Room Temperature ◽  
Colloidal Particles ◽  
Surface Structures ◽  
Transmission Electron ◽  
Different Shapes ◽  
Shape Controlled ◽  
Shape Controlling ◽  
Ar Gas

The selectivity and activities of platinum (Pt) particles strongly depend on their sizes and shapes. A technique has been recently reported for controlling the shapes and sizes of Pt particles [1]. Pt particles were prepared by bubbling Ar gas through the solution of K2PtCl4, and the Pt ions were reduced by flowing H2 gas through the solution. The shape control was performed by changing the ratio of the concentration of the capping polymer material to that of the platinum cations used in the reductive synthesis of colloidal particles in solution at room temperature [2]. High percentage of cubic, tetrahedral and octahedral particles have been prepared at room temperature, making it possible for studying the chemical activities of particles with different shapes and facets. This paper aims to study the surface structures of Pt particles prepared by the shape-controlling synthesis technique using high-resolution transmission electron microscopy (HRTEM).

SHAPE CONTROL OF Bi2S3 NANOPARTICLES

2002 ◽  
Vol 01 (02) ◽  
pp. 187-193
Author(s):  
DENGYU PAN ◽  
SHUYUAN ZHANG ◽  
GONGPU LI ◽  
YIQING CHEN ◽  
J. G. HOU
Keyword(s):  
Powder Diffraction ◽  
Reaction Temperature ◽  
Shape Control ◽  
Growth Mechanisms ◽  
Hollow Nanospheres ◽  
X Ray ◽  
Transmission Electron Microcopy ◽  
Transmission Electron ◽  
Different Shapes

Bi 2 S 3 nanocrystals with different shapes were synthesized via a simple solventothermal route. Nanorods and nanotubes can be obtained by changing reaction temperature. In the presence of surfactant, hollow nanospheres can be produced. The nanocrystals were characterized by X-ray powder diffraction and transmission electron microcopy. The growth mechanisms were discussed.

scholarly journals A Generalized Cubic Exponential B-Spline Scheme with Shape Control

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Baoxing Zhang ◽  
Hongchan Zheng ◽  
Lulu Pan
Keyword(s):  
Shape Control ◽  
Exponential Polynomials ◽  
B Spline ◽  
Control Value ◽  
Suitable Function ◽  
Initial Control ◽  
Different Shapes ◽  
Two Parameters

In this paper, a generalized cubic exponential B-spline scheme is presented, which can generate different kinds of curves, including the conics. Such a scheme is obtained by generalizing the cubic exponential B-spline scheme based on an iteration from the generation of exponential polynomials and a suitable function with two parameters μ and ν. By changing the values of μ and ν, the sensitivity of the shape of the subdivision curve to the initial control value v0 can be changed and different kinds of curves can then be obtained by adjusting the value of v0. For this new scheme, we show that, with any admissible choice of μ and ν, it owns the same smoothness order and support as the cubic exponential B-spline scheme. Besides, based on a different iteration and another suitable function, we construct a similar nonstationary scheme to generate more curves with different shapes and show the role of iterations and suitably chosen functions in the construction and analysis of such schemes. Several examples are given to illustrate the performance of our new schemes.

scholarly journals Shape control of mesoporous silica nanomaterials templated with dual cationic surfactants and their antibacterial activities

2016 ◽  
Vol 4 (1) ◽  
pp. 87-91 ◽  
Author(s):  
Nanjing Hao ◽  
Xuan Chen ◽  
Kalana W. Jayawardana ◽  
Bin Wu ◽  
Madanodaya Sundhoro ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Mesoporous Silica ◽  
Cationic Surfactants ◽  
Shape Control ◽  
Antibacterial Activities ◽  
Silica Nanomaterials ◽  
Different Shapes

Mesoporous silica nanomaterials of different shapes (film, platelet, sphere, rod) were synthesized by varying the mole ratio of dual surfactants. Their shape-dependent antibacterial activity was observed.

Structural phenomena in the growth of carbon nanotubes

1993 ◽  
Vol 51 ◽  
pp. 750-751
Author(s):  
Jun Jiao
Keyword(s):  
Carbon Nanotubes ◽  
Growth Mechanism ◽  
Carbonaceous Material ◽  
Cluster Growth ◽  
Structural Elements ◽  
Rich Variety ◽  
Different Shapes ◽  
Point To Point

HREM studies of the carbonaceous material deposited on the cathode of a Huffman-Krätschmer arc reactor have shown a rich variety of multiple-walled nano-clusters of different shapes and forms. The preparation of the samples, as well as the variety of cluster shapes, including triangular, rhombohedral and pentagonal projections, are described elsewhere.The close registry imposed on the nanotubes, focuses attention on the cluster growth mechanism. The strict parallelism in the graphitic separation of the tube walls is maintained through changes of form and size, often leading to 180° turns, and accommodating neighboring clusters and defects. Iijima et. al. have proposed a growth scheme in terms of pentagonal and heptagonal defects and their combinations in a hexagonal graphitic matrix, the first bending the surface inward, and the second outward. We report here HREM observations that support Iijima’s suggestions, and add some new features that refine the interpretation of the growth mechanism. The structural elements of our observations are briefly summarized in the following four micrographs, taken in a Hitachi H-8100 TEM operating at an accelerating voltage of 200 kV and with a point-to-point resolution of 0.20 nm.

Sign in / Sign up

Export Citation Format

Share Document