Shape transformation of self-assembled Au nanoparticles by the systematic control of deposition amount on sapphire (0001)

RSC Advances ◽  
2015 ◽  
Vol 5 (81) ◽  
pp. 66212-66220 ◽  
Author(s):  
Puran Pandey ◽  
Mao Sui ◽  
Ming-Yu Li ◽  
Quanzhen Zhang ◽  
Eun-Soo Kim ◽  
...  
Keyword(s):  
Au Nanoparticles ◽  
Chemical Properties ◽  
Shape Transformation ◽  
Au Nps ◽  
Size Dependent ◽  
Deposition Amount ◽  
Significant Research ◽  
Physical And Chemical ◽  
Systematic Control ◽  
And Chemical Properties

The shape and size dependent optical, physical and chemical properties of isotropic and anisotropic gold nanoparticles (Au NPs) have attracted significant research interest for their application in various optoelectronic devices.

Carbon Nanotube Composites

2019 ◽  
Vol 23 ◽  
pp. 75-81
Author(s):  
Ponnusamy Senthil Kumar ◽  
G. Janet Joshiba
Keyword(s):  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Carbon Nanotube ◽  
Chemical Properties ◽  
Market Demand ◽  
Size Dependent ◽  
Nanotube Composites ◽  
Carbon Nanotube Composites ◽  
Physical And Chemical ◽  
And Chemical Properties

The discovery of carbon nanotubes is one of the remarkable achievement in the field of material science and it is a great advancement of Nanotechnology. A carbon nanotube is an expedient material used in several domains and paves way for the welfare of humans in many ways. Carbon nanotubes are nanosized tubes made from graphitic carbons and it is well known for its exclusive physical and chemical properties. The market demand for the nanotubes has increased progressively due to its size dependent, structure and mechanical properties. The carbon nanotubes possess high tensile strength and it is also found to be the durable fibre ever known. It is also found to possess exceptional electrical properties. The carbon nanotube composites have an excellent young’s modulus and higher tensile strength same as graphite carbon. This review plots the properties of carbon nanotubes and portrays the planning and properties of carbon nanotube composites. The wide application of carbon nanotube composites is also explained.

Nanoassembled Model Catalysts: Changing Efficiency and Selectivity Atom-by-Atom

2000 ◽  
Vol 648 ◽  
Author(s):  
U. Heiz ◽  
S. Abbet ◽  
H. Häkkinen ◽  
U. Landman
Keyword(s):  
High Selectivity ◽  
Bulk Material ◽  
Gold Cluster ◽  
Chemical Properties ◽  
Model Catalysts ◽  
Size Dependent ◽  
Phase Cluster ◽  
Physical And Chemical ◽  
Supported Pd ◽  
And Chemical Properties

AbstractCluster-assembled materials open fascinating new routes for tuning physical and chemical properties by changing cluster size and often these materials behave completely differently than their bulk analogues. By depositing gas phase cluster cations on various surfaces, cluster model catalysts are fabricated, which exhibit remarkable catalytic activity. While inert as bulk material, gold cluster catalysts oxidize carbon monoxide with Au8 to be the smallest active size. In contrast to the high selectivity of Pd(111) surfaces for the cyclotrimerization of acetylene, small supported Pdn clusters reveal a strongly size-dependent selectivity for the polymerization of acetylene and catalyze the cyclotrimerization as well as the hydrogenation of the formed intermediate C4H4.

scholarly journals Physical-Chemical Effects of Nanoparticles on Electropolymerized Polyaniline

2021 ◽  
Vol 12 (5) ◽  
pp. 5996-6009
Keyword(s):  
Tio2 Nanoparticles ◽  
Polymer Films ◽  
Au Nanoparticles ◽  
Chemical Properties ◽  
Chemical Effects ◽  
Physical Chemical ◽  
Polyaniline Films ◽  
Physical And Chemical ◽  
Chemical Influence ◽  
And Chemical Properties

The incorporation of nanoparticles on polymer films is possible to obtain materials with desired properties. In the present work, we address the physical-chemical influence of nanoparticles in polymer films by producing and characterizing polyaniline hybrids with SiO2 and Au nanoparticles and comparing them with films with TiO2 nanoparticles. The hybrid films were characterized by SEM, EDS, UV-Vis, AFM, Raman, and cyclic voltammetry. Unlike TiO2 nanoparticles, SiO2 and Au nanoparticles do not promote any noticeable change in polyaniline oxidation state in less acid environments (pH 5.9 and 6.15). However, in those environments, the presence of nanoparticles significantly increases the film's conductivity. At a pH of 1.5 and 3.9, all three kinds of nanoparticles are screened by ions from the solution diminishing their physical-chemical effects on polyaniline. Thus, our results suggest that, in general, nanoparticles don't have any physical-chemical effects on polyaniline films when deposited in acid enough environments but can change their physical and chemical properties when deposited in less acid environments.

A Study on the Splitting of Large Gold Nanoparticles by Addition of Aqueous Ascorbic Acid

2021 ◽  
Vol 13 (8) ◽  
pp. 1474-1478
Author(s):  
HeeJin Noh ◽  
Gwang-Bum Im ◽  
Taekyung Yu ◽  
Suk Ho Bhang
Keyword(s):  
Gold Nanoparticles ◽  
Ascorbic Acid ◽  
Au Nanoparticles ◽  
Bimetallic Nanoparticles ◽  
Critical Role ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Shape Of Nanoparticles ◽  
Physical And Chemical ◽  
And Chemical Properties

Control of the size and shape of nanoparticles significantly impacts the ability to control their physical and chemical properties. In this paper, we introduce a technique to split large nanoparticles into smaller ones. After the addition of ascorbic acid (AA), 50 nm-sized gold (Au) nanoparticles in the form of polycrystals were split into nanoparticles with sizes of 10 nm. We believe that AA plays a critical role in breaking down the Au particles. Additionally, this technique can be used to synthesize small AuPt bimetallic nanoparticles with a small amount of Pt on their surface showing that this reaction could help in the formation of a variety of small Au-based bimetallic nanoparticles.

Bone Tissue Engineering Incorporating Poly(Propylene Fumarate) Composites: A Mini Review

Nano LIFE ◽  
2016 ◽  
Vol 06 (03n04) ◽  
pp. 1642011 ◽  
Author(s):  
Emily G. Westbrook
Keyword(s):  
Tissue Engineering ◽  
Bone Tissue Engineering ◽  
Bone Tissue ◽  
Chemical Properties ◽  
Living Cells ◽  
Physical And Chemical Properties ◽  
Significant Research ◽  
Poly Propylene ◽  
Physical And Chemical ◽  
And Chemical Properties

Tissue engineering is intended to manipulate living cells to help develop substitutes for native tissues or remodel tissue. Bioartificial tissues are commonly explored in various tissue engineering ventures to overcome the disadvantages of working with native tissue. Poly(propylene fumarate) is a potential biomaterial for bioartificial bone grafts. The polymer’s many desirable physical and chemical properties have drawn significant research interest. This miniature review is intended to cover a small portion of the investigations of poly(propylene fumarate) as a bone tissue engineering biomaterial.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

Tailoring microstructures of materials through biomimetics

1993 ◽  
Vol 51 ◽  
pp. 500-501
Author(s):  
Mehmet Sarikaya ◽  
Ilhan A. Aksay
Keyword(s):  
Chemical Properties ◽  
Design And Synthesis ◽  
Structure Sensitive ◽  
Macro Scale ◽  
Methods Of Synthesis ◽  
Successive Level ◽  
Engineering Materials ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Synthesis Of Materials

Biomimetics involves investigation of structure, function, and methods of synthesis of biological composite materials. The goal is to apply this information to the design and synthesis of materials for engineering applications.Properties of engineering materials are structure sensitive through the whole spectrum of dimensions from nanometer to macro scale. The goal in designing and processing of technological materials, therefore, is to control microstructural evolution at each of these dimensions so as to achieve predictable physical and chemical properties. Control at each successive level of dimension, however, is a major challenge as is the retention of integrity between successive levels. Engineering materials are rarely fabricated to achieve more than a few of the desired properties and the synthesis techniques usually involve high temperature or low pressure conditions that are energy inefficient and environmentally damaging.In contrast to human-made materials, organisms synthesize composites whose intricate structures are more controlled at each scale and hierarchical order.

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