A New Approach to Hybrid Nanocomposite Materials with Periodic Structures

2002 ◽  
Vol 124 (49) ◽  
pp. 14512-14513 ◽  
Author(s):  
Jiguang Zhang ◽  
Neil Coombs ◽  
Eugenia Kumacheva
Keyword(s):  
Periodic Structures ◽  
Nanocomposite Materials ◽  
Hybrid Nanocomposite ◽  
New Approach

Coordination sequences and layer-by-layer growth of periodic structures

2019 ◽  
Vol 234 (5) ◽  
pp. 291-299
Author(s):  
Anton Shutov ◽  
Andrey Maleev
Keyword(s):  
Generating Functions ◽  
Diophantine Equations ◽  
Periodic Structures ◽  
Layer Growth ◽  
Layer By Layer ◽  
Explicit Formulas ◽  
New Approach ◽  
Coordination Numbers ◽  
Linear Diophantine Equations ◽  
Recurrent Relations

Abstract A new approach to the problem of coordination sequences of periodic structures is proposed. It is based on the concept of layer-by-layer growth and on the study of geodesics in periodic graphs. We represent coordination numbers as sums of so called sector coordination numbers arising from the growth polygon of the graph. In each sector we obtain a canonical form of the geodesic chains and reduce the calculation of the sector coordination numbers to solution of the linear Diophantine equations. The approach is illustrated by the example of the 2-homogeneous kra graph. We obtain three alternative descriptions of the coordination sequences: explicit formulas, generating functions and recurrent relations.

scholarly journals Effects of Ultrasound on Zinc Oxide/Vermiculite/Chlorhexidine Nanocomposite Preparation and Their Antibacterial Activity

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1309 ◽  
Author(s):  
Karla Čech Barabaszová ◽  
Sylva Holešová ◽  
Kateřina Šulcová ◽  
Marianna Hundáková ◽  
Barbora Thomasová
Keyword(s):  
Antimicrobial Activity ◽  
Particle Size ◽  
Zinc Oxide ◽  
Antibacterial Activity ◽  
Ultrasonic Treatment ◽  
Nanocomposite Materials ◽  
Hybrid Nanocomposite ◽  
X Ray Diffraction ◽  
X Ray

Microbial infection and biofilm formation are both problems associated with medical implants and devices. In recent years, hybrid organic-inorganic nanocomposites based on clay minerals have attracted significant attention due to their application potential in the field of antimicrobial materials. Organic drug/metal oxide hybrids exhibit improved antimicrobial activity, and intercalating the above materials into the interlayer of clay endows a long-term and controlled-release behavior. Since antimicrobial activity is strongly related to the structure of the material, ultrasonic treatment appears to be a suitable method for the synthesis of these materials as it can well control particle size distribution and morphology. This study aims to prepare novel, structurally stable, and highly antimicrobial nanocomposites based on zinc oxide/vermiculite/chlorhexidine. The influence of ultrasonic treatment at different time intervals and under different intercalation conditions (ultrasonic action in a breaker or in a Roset’s vessel) on the structure, morphology, and particle size of prepared hybrid nanocomposite materials was evaluated by the following methods: scanning electron microscopy, X-ray diffraction, energy dispersive X-ray fluorescence spectroscopy, carbon phase analysis, Fourier transforms infrared spectroscopy, specific surface area measurement, particle size analysis, and Zeta potential analysis. Particle size analyses confirmed that the ultrasonic method contributes to the reduction of particle size, and to their homogenization/arrangement. Further, X-ray diffraction analysis confirmed that ultrasound intercalation in a beaker helps to more efficiently intercalate chlorhexidine dihydrochloride (CH) into the vermiculite interlayer space, while a Roset’s vessel contributed to the attachment of the CH molecules to the vermiculite surface. The antibacterial activity of hybrid nanocomposite materials was investigated on Gram negative (Escherichia coli, Pseudomonas aeruginosa) and Gram positive (Staphylococcus aureus, Enterococcus faecalis) bacterial strains by finding the minimum inhibitory concentration. All hybrid nanocomposite materials prepared by ultrasound methods showed high antimicrobial activity after 30 min, with a long-lasting effect and without being affected by the concentration of the antibacterial components zinc oxide (ZnO) and CH. The benefits of the samples prepared by ultrasonic methods are the rapid onset of an antimicrobial effect and its long-term duration.

Tunable dielectric constant of polyimide–barium titanate nanocomposite materials as the gate dielectrics for organic thin film transistor applications

RSC Advances ◽  
2014 ◽  
Vol 4 (107) ◽  
pp. 62132-62139 ◽  
Author(s):  
Yang-Yen Yu ◽  
Cheng-Liang Liu ◽  
Yung-Chih Chen ◽  
Yu-Cheng Chiu ◽  
Wen-Chang Chen
Keyword(s):  
Thin Film ◽  
Dielectric Constant ◽  
Thin Film Transistors ◽  
Gate Dielectrics ◽  
Thin Film Transistor ◽  
Nanocomposite Materials ◽  
Organic Thin Film Transistors ◽  
Hybrid Nanocomposite ◽  
Organic Thin Film ◽  
Organic Thin Film Transistor

Polyimide (PI)–BaTiO3 (BT) NPs hybrid nanocomposite dielectrics with tunable BT loadings (X) were fabricated for investigating their properties on the pentacene organic thin film transistors (OTFTs).

New approach to analysing conductor-dielectric periodic structures

1987 ◽  
Vol 23 (23) ◽  
pp. 1231 ◽  
Author(s):  
Tian-Lin Dong
Keyword(s):  
Periodic Structures ◽  
New Approach

DNA-templated in situ growth of AgNPs on SWNTs: a new approach for highly sensitive SERS assay of microRNA

2015 ◽  
Vol 51 (30) ◽  
pp. 6552-6555 ◽  
Author(s):  
Jing Zheng ◽  
Junhui Bai ◽  
Qifeng Zhou ◽  
Jishan Li ◽  
Yinhui Li ◽  
...  
Keyword(s):  
In Situ Growth ◽  
Hybrid Nanocomposite ◽  
New Approach ◽  
Microrna Detection ◽  
Highly Sensitive

The SWNT@AgNPs hybrid nanocomposite was employed to achieve microRNA detection.

Advanced anticorrosive coatings prepared from electroactive epoxy–SiO2 hybrid nanocomposite materials

2011 ◽  
Vol 56 (17) ◽  
pp. 6142-6149 ◽  
Author(s):  
Tsao-Cheng Huang ◽  
Yu-An Su ◽  
Tzu-Chun Yeh ◽  
Hsiu-Ying Huang ◽  
Chi-Phi Wu ◽  
...  
Keyword(s):  
Nanocomposite Materials ◽  
Hybrid Nanocomposite ◽  
Anticorrosive Coatings
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