Multi-Functional Nanoscaled Film Deposited on PET Non-Woven by Sputtering

2009 ◽  
Vol 79-82 ◽  
pp. 557-560
Author(s):  
Jian Feng Di ◽  
Wen Qin Du ◽  
Fei Yu ◽  
Hong Jin Qi
Keyword(s):  
Chemical Nature ◽  
Antibacterial Properties ◽  
Metallic Film ◽  
Metallic Films ◽  
Moisture Permeability ◽  
Metal Deposit ◽  
Deposited Metal ◽  
Discharge Parameters ◽  
Short Time ◽  
Target Metal

In order to prepare a time decay-resistant electromagnetic shielding (ES) fabric with good handle, moisture permeability and antibacterial properties, Cu, Ag, Ag/Cu and Ag/Cu/Ag films were deposited on PET non-woven by sputtering in screening experiment. Considering the post continues processing, this study focuses on discharge parameters optimum for a limited short time. Relationship was studied between deposited rate and ES effectiveness (ESE) for the four metallic films on various substrates. The metal deposit greatly relays on the chemical nature of the substrate and target metal category. The deposited metal rate on metal is larger than that on PET. In comparison with single metallic film, the dB value of multi-metallic film obtained for same time even for more time remarkably dropped. Therefore, an Ag-coated PET no-woven was finally fabricated as the multi-functional fabric with anti-decay ESE. The multi-functional PET no-woven with good handle obtained for 3min. by optimizing other parameters exhibits higher ESE, good anti-bacterial and moisture permeability.

Electrochemically mediated gradient metallic film generation

2021 ◽  
Vol 45 (4) ◽  
pp. 1809-1813
Author(s):  
Xiaoqian Ma ◽  
Huan Song ◽  
Junfeng Yan
Keyword(s):  
Metallic Film ◽  
Metallic Films ◽  
Ion Deposition

Metallic films with a controlled gradient can be fabricated on substrates via electrochemically induced metallic ion deposition.

scholarly journals Transparent silver and other metallic films

1908 ◽  
Vol 81 (548) ◽  
pp. 301-310 ◽  
Keyword(s):  
White Light ◽  
Electric Resistivity ◽  
Metallic Film ◽  
Moderate Temperature ◽  
Metallic Films ◽  
Remarkable Change ◽  
Simple Method ◽  
Glass Plates ◽  
Cold Gas

It is well known that when thin leaves of gold or silver are mounted upon glass and heated to a temperature which is well below a red heat, a remarkable change of properties takes place, whereby the continuity of the metallic film is destroyed. The result is that white light is now freely transmitted, reflection is correspondingly diminished, while the electric resistivity is enormously increased. A simple method of illustrating this extraordinary change is to mount a sheet of silver leaf between two clean lantern plates, clip them lightly together by means of wire paper fasteners or other suitable means, and then heat gradually to a temperature of not more than 500°C. This can be done con­veniently by placing the plates on a thin fire-brick in a cold gas muffle, and then raising the temperature to the desired point. The gas should now be turned off, and the glass plates allowed to cool slowly, so as to avoid cracking. They can then be bound with strips like an ordinary lantern plate, and a permanent example of transparent silver is obtained. It will be found that such a plate transmits the light of the electric lantern almost as readily as ordinary glass, and does not produce any change of colour. The great trans­parency of the film may be shown by placing the plate upon printing or writing, and photographing the characters through the plate. Every detail of the characters can be reproduced with remarkable clearness. At first sight it is perhaps difficult to conceive that so distinct an impression could be obtained through what was originally a perfectly opaque sheet of silver, and which has only been once heated to a moderate temperature.

scholarly journals Axel Hugo Theodor Theorell, 6 July 1903 - 15 August 1982

1983 ◽  
Vol 29 ◽  
pp. 584-621 ◽  
Keyword(s):  
Molecular Mass ◽  
Nicotinamide Adenine Dinucleotide ◽  
Chemical Nature ◽  
Small Population ◽  
Nicotinamide Adenine ◽  
Protein Chemistry ◽  
Old Yellow Enzyme ◽  
Otto Warburg ◽  
Oxidation Reduction ◽  
Short Time

It has often been remarked that Sweden has fostered an exceptionally high proportion of scientists of the first rank in relation to its small population. The long list of Swedish Nobel Laureates includes, as well as Hugo Theorell, both The Svedberg and Arne Tiselius, with whom Theorell worked for a short time in Uppsala in 1932 in his early studies of the molecular mass of myoglobin. Theorell himself, however, always acknowledged Otto Warburg as his principal mentor. His work on the chemical nature and constitution of the old yellow enzyme in Warburg’s laboratory in Berlin in 1933-35 opened up the whole field of oxidation-reduction enzymes that use common non-protein cofactors. It was to this field, and particularly to the chemical nature of the interactions between the enzyme proteins and their cofactors— whether flavin, haem or nicotinamide adenine dinucleotide— that Theorell devoted most of his subsequent researches. With his death we have lost one of the founders of enzymology and protein chemistry.

scholarly journals Fabrication of Antibacterial Metal Surfaces Using Magnetron-Sputtering Method

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7301
Author(s):  
Agata Markowska-Szczupak ◽  
Oliwia Paszkiewicz ◽  
Beata Michalkiewicz ◽  
Adrianna Kamińska ◽  
Rafał Jan Wróbel
Keyword(s):  
Magnetron Sputtering ◽  
Staphylococcus Epidermidis ◽  
Glass Plate ◽  
Antibacterial Properties ◽  
Coli Strain ◽  
Copper Films ◽  
Metallic Films ◽  
Metallic Surfaces ◽  
E Coli ◽  
Contact Killing

One-hundred-nanometer films consisting of silver, copper, and gold nanocrystallites were prepared, and their antibacterial properties were quantitatively measured. The magnetron-sputtering method was used for the preparation of the metallic films over the glass plate. Single- and double-layer films were manufactured. The films were thoroughly characterized with the XRD, SEM, EDS, and XPS methods. The antibacterial activity of the samples was investigated. Gram-negative Escherichia coli, strain K12 ATCC 25922 (E. coli), and Gram-positive Staphylococcus epidermidis, ATCC 49461 (S. epidermidis), were used in the microbial tests. The crystallite size was about 30 nm in the cases of silver and gold and a few nanometers in the case of copper. Significant oxidation of the copper films was proven. The antibacterial efficacy of the tested samples followed the order: Ag/Cu > Au/Cu > Cu. It was concluded that such metallic surfaces may be applied as contact-killing materials for a more effective fight against bacteria and viruses.

Enhanced gas sensing properties of chemiresistors based on ZnO nanorods electrodecorated with Au and Pd nanoparticles

MRS Advances ◽  
2017 ◽  
Vol 2 (18) ◽  
pp. 1001-1007 ◽  
Author(s):  
E. Dilonardo ◽  
M. Alvisi ◽  
G. Cassano ◽  
M. Penza
Keyword(s):  
Chemical Nature ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Zno Nanorods ◽  
Pd Nanoparticles ◽  
Zno Nanostructures ◽  
Sensing Properties ◽  
Deposited Metal ◽  
Gas Sensing Properties ◽  
Pollutant Gases

ABSTRACTColloidal Au and Pd nanoparticles (NPs) were directly electrochemically synthesized, by sacrificial anode electrolysis (SAE), on hydrothermal ZnO nanostructures, previously desiccated; further, the functionalized ZnO nanostructures were subjected to thermal annealing at 550°C to obtain stable ZnO nanorods (NRs), superficially decorated by naked metal NPs. The both pristine and metal functionalized ZnO NRs were proposed as active layer in chemiresistive sensors for environmental monitoring to detect pollutant gases (e.g. NO2, C4H10).The effect of the presence and of the chemical nature of the deposited metal NPs on the performance of ZnO NRs-based gas sensor (e.g. sensitivity, selectivity and recovery) was evaluated, comparing the sensing results with those of pristine ZnO NRs. In particular, the gas sensing properties of pristine and metal-functionalized ZnO NRs were studied at an operating temperature of 300°C towards a various range of concentration of different gaseous pollutants.

scholarly journals X. On the properties of electro-deposited antimony

1858 ◽  
Vol 148 ◽  
pp. 185-197 ◽  
Keyword(s):  
Hydrochloric Acid ◽  
Tartaric Acid ◽  
Royal Society ◽  
Distilled Water ◽  
Pure Acid ◽  
Philosophical Magazine ◽  
Yellow Colour ◽  
Deposited Metal ◽  
Short Time ◽  
Tartar Emetic

1. While engaged in depositing antimony by the electro-process in October 1854, I observed a remarkable phenomenon of development of heat in the deposited metal when gently struck, and published a brief account of it in the Philosophical Magazine for January 1855; since that period I have investigated the phenomenon, and have now the honour of laying the results before the Royal Society. 2. In depositing this metal by the electro-process several solutions may be successfully used, consisting of compounds of the metal either with hydrochloric or tartaric acid; but those I have generally operated with have consisted,—1st, of ordinary chloride of antimony (as prepared for pharmaceutical purposes) nearly saturated with antimony, by suspending a plate of that metal in it as an anode, and passing an electric current from several pairs of zinc and silver batteries through it until a copious deposit of bright metal occurred, and until its yellow colour had nearly disappeared; and 2nd, of five parts of tartar-emetic and five parts of tartaric acid, dissolved in a mixture of two parts of hydrochloric acid and thirty parts of water; each solution being filtered before using. A most excellent solution in lieu of the first may quickly be formed by saturating ordinary chloride of antimony with tartar-emetic, using about three or four parts of the former to one of the latter; or by dissolving two parts of tartar-emetic in three parts of hydrochloric acid. I have also in place of that liquid occasionally used hydrochloric acid saturated with antimony by the battery process; and sometimes a liquid composed of seven parts of tartar-emetic dissolved in a mixture of eight parts of hydrochloric acid and four parts of water., Substituting pure acid, distilled water, and pure antimony, for those of the ordinary quality, made no material difference in the results. Each solution requires to be electrolysed a short time before it yields a good and uniform deposit.

Hydrodepolymerization of Rubber

1942 ◽  
Vol 15 (1) ◽  
pp. 33-42
Author(s):  
N. D. Zelinsky ◽  
J. B. Rapoport
Keyword(s):  
Thermal Decomposition ◽  
High Pressure ◽  
Hydrogen Pressure ◽  
Chemical Nature ◽  
Coal Tar ◽  
Molybdenum Sulfide ◽  
Synthetic Rubber ◽  
Cyclic Compounds ◽  
Short Time ◽  
Mobile Liquid

Abstract In a previous paper, one of the authors showed that the thermal decomposition of both natural and synthetic rubber proceeds easily and rapidly in the presence of aluminum chloride. The product so obtained is a mixture of hydrocarbons particularly rich in cyclic forms. One might, therefore, be led to believe that the polymerization of isoprene or butadiene, both in nature and under synthetic conditions, may be preceded by their dimeric or polymeric cyclization, with subsequent association of these unsaturated cyclic compounds, resulting in the formation of rubber. As a contribution to the knowledge of the chemical nature of highly polymeric substances such as rubber, we present here the results of our investigations on the depolymerization of rubber when subjected to hydrogen under high pressure in the presence of a catalyst. It was found that rubber, in the same way as oil or coal tar, is completely liquefied under such conditions. Experiments showed that, within the relatively short time of 1.5 to 2 hours, at a temperature of 400° C and a hydrogen pressure of 150 atmospheres, and in the presence of molybdenum sulfide or of nickel deposited on aluminum oxide, rubber is completely converted into a mobile liquid consisting of saturated and unsaturated hydrocarbons. The chemical nature of the resultant hydrocarbons casts light on the structure of rubber. It should be noted here that, in the absence of a catalyst, rubber cannot be converted into a mobile liquid when subjected to hydrogen under pressure.

scholarly journals DEVELOPMENT OF MULTIFUNCTIONAL YARN FROM THE FUNCTIONALIZATION OF ORGANIC RAW COTTON FIBERS WITH ZINC NANOPARTICLES

2021 ◽  
Vol 2021 ◽  
pp. 35-44
Author(s):  
S. Ferreira ◽  
P. Silva ◽  
J. Bessa ◽  
F. Cunha ◽  
C. Castro ◽  
...  
Keyword(s):  
Chemical Nature ◽  
Antibacterial Properties ◽  
Aqueous Dispersion ◽  
Cotton Fibers ◽  
Zinc Nanoparticles ◽  
Textile Materials ◽  
Moisture Management ◽  
Contagious Diseases ◽  
The One ◽  
Single Jersey

The emergence of increasingly contagious diseases in these days, such as COVID-19, increased the need to develop more effective personal protection equipment’s (PPEs). Therefore, the goal is to create textile materials capable to act against bacteria, virus or fungi, with a long-lasting performance but, at the same time, that could be comfortable and safe for their users. In this sense, based on the advantages of nanotechnology, the aim of this work was to functionalize organic raw cotton fibers with zinc nanoparticles (NPs) and previously tretated with NaOH, for the further production of multifunctional yarns with antimicrobial activity. Thereby, the fibers functionalization was tested using 1% w/w and 2% w/w of zinc NPs aqueous dispersion, being subsequently evaluated their distribution, chemical nature and zinc concentration by SEM/EDS and Atomic Absorption Spectroscopy, respectively. Subsequently, using the functionalized fibers, a yarn was spinned and their structural, mechanical and moisture management properties determined. Also, to assess the influence of the produced yarn on the properties of a fibrous structure, a single jersey knit sample was further produced and evaluated regarding their mechanical, moisture management and antibacterial properties. Based on the methodology used it was possible to develop a yarn with a tenacity 24% higher and a knit sample 28% more breathable and with a water evaporating ratio 37% higher than the one without any treatment or functionalization, but mainly with a strong antibacterial activity against both gram-negative (Klebsiella Pneumoniae) and gram-positive (Staphylococcus Aureus) bacteria, presenting therefore potential to be used in the production of effective PPEs.

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