Preparation of Platinum Nanoparticles on Carbon Nanostructures Using Metal-Organic Chemical Fluid Deposition Employing Supercritical Carbon Dioxide

2010 ◽  
Vol 10 (6) ◽  
pp. 4023-4029 ◽  
Author(s):  
Mineo Hiramatsu ◽  
Takuma Machino ◽  
Kota Mase ◽  
Masaru Hori ◽  
Hiroyuki Kano
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Platinum Nanoparticles ◽  
Carbon Nanostructures ◽  
Organic Chemical ◽  
Metal Organic ◽  
Supercritical Carbon

Organic chemical devulcanization of rubber vulcanizates in supercritical carbon dioxide and associated less eco-unfriendly approaches: A review

2021 ◽  
pp. 0734242X2110085
Author(s):  
Jabulani I Gumede ◽  
Buyiswa G Hlangothi ◽  
Chris D Woolard ◽  
Shanganyane P Hlangothi
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Negative Impact ◽  
Raw Materials ◽  
Chemical Components ◽  
Organic Chemical ◽  
Attractive Alternative ◽  
Special Focus ◽  
Waste Tyres ◽  
Supercritical Carbon

There is a growing need to recover raw materials from waste due to increasing environmental concerns and the widely adopted transition to circular economy. For waste tyres, it is necessary to continuously develop methods and processes that can devulcanize rubber vulcanizates into rubber products with qualities and properties that can closely match those of the virgin rubber. Currently, the most common, due to its efficiency and perceived eco-friendliness in recovering raw rubber from waste rubbers, such as tyres, is devulcanization in supercritical carbon dioxide (scCO2) using commercial and typical devulcanizing agents. The scCO2 has been generally accepted as an attractive alternative to the traditional liquid-based devulcanization media because of the resultant devulcanized rubber has relatively better quality than other processes. For instance, when scCO2 is employed to recover rubber from waste tyres (e.g. truck tyres) and the recovered rubber is blended with virgin natural rubber (NR) in various compositions, the curing and mechanical properties of the blends closely match those of virgin NR. The atmospheric toxicity and cost of the commonly used devulcanization materials like chemical agents, oils and solvents have enabled a shift towards utilization of greener (mainly organic) and readily available devulcanization chemical components. This literature review paper discusses the approaches, which have less negative impact on the environment, in chemical devulcanization of rubber vulcanizates. A special focus has been on thermo-chemical devulcanization of waste tyres in scCO2 using common organic devulcanizing agents.

Supercritical Carbon Dioxide Enables Rapid, Clean, and Scalable Conversion of a Metal Oxide into Zeolitic Metal–Organic Frameworks

2018 ◽  
Vol 18 (5) ◽  
pp. 3222-3228 ◽  
Author(s):  
Joseph M. Marrett ◽  
Cristina Mottillo ◽  
Simon Girard ◽  
Christopher W. Nickels ◽  
Jean-Louis Do ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Metal Oxide ◽  
Metal Organic Frameworks ◽  
Metal Organic ◽  
Supercritical Carbon

COAXIAL NANOTUBES FROM POLY(ETHYL 2-CYANOACRYLATE)/POLY(p-XYLYLENE) CONFORMAL COATINGS VIA VAPOR DEPOSITION

NANO ◽  
2010 ◽  
Vol 05 (03) ◽  
pp. 149-160 ◽  
Author(s):  
ZHIXIANG LU
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Wall Thickness ◽  
Vapor Deposition ◽  
Platinum Nanoparticles ◽  
Alumina Membrane ◽  
Alumina Membranes ◽  
Conformal Coatings ◽  
Supercritical Carbon

Ultra-thin (10–100 nm) conformal coatings of poly(ethyl 2-cyanoacrylate) and poly(p-xylylene) have been synthesized via vapor deposition in the confined nanochannels of anodized alumina membranes. Poly(ethyl 2-cyanoacrylate) nanotubes and coaxial poly(ethyl 2-cyanoacrylate)/poly(p-xylylene) nanotubes with precisely-controlled wall thickness were obtained after the removal of the inorganic anodized alumina membrane. Platinum nanoparticles have also been deposited in the coaxial nanotubes via supercritical carbon dioxide.

scholarly journals Low Temperature Deposition of Metal Oxide Thin Films in Supercritical Carbon Dioxide Using Metal-organic Precursors

2007 ◽  
Vol 1007 ◽  
Author(s):  
Theodosia Gougousi ◽  
Zhiying Chen
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Low Temperatures ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Metal Organic ◽  
Organic Precursors ◽  
Supercritical Carbon

ABSTRACTA novel chemical route in thin film formation that includes the use of inorganic and organic peroxides and metal organic complexes soluble in supercritical carbon dioxide has been investigated for the deposition of alumina, titania and zirconia thin films at low temperatures (<150°C). The metal organic precursors used include: Al(acac)3, OTi(tmhd)2, and Zr(acac)4. Tert-butyl peroxide, and a 30% aqueous solution of hydrogen peroxide were used as oxidants. Depositions were carried out in a 25 ml hot wall reactor at pressures ranging from 2100 to 3900 psi at 80-140°C. The deposited thin films were investigated by using X-ray photoelectron spectroscopy (XPS) and transmission Fourier transform infrared spectroscopy (FTIR). XPS and FTIR results indicate the formation of metal oxides thin films with some bonded carbon. The deposition temperatures achieved in this process are substantially lower than those used in conventional vacuum deposition techniques making feasible the deposition on temperature sensitive substrates and organic materials required for the development of hybrid organic/inorganic devices. Processing at low temperatures in supercritical carbon dioxide may provide the basis for the development of an alternative, environmentally friendly, thin film deposition technique for the processing of nanostructures.

Supercritical carbon dioxide-assisted drug loading and release from biocompatible porous metal–organic frameworks

2014 ◽  
Vol 2 (43) ◽  
pp. 7551-7558 ◽  
Author(s):  
Kiyoshi Matsuyama ◽  
Nobukatsu Hayashi ◽  
Misaki Yokomizo ◽  
Takafumi Kato ◽  
Kiyomi Ohara ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Controlled Release ◽  
Supercritical Carbon Dioxide ◽  
Drug Loading ◽  
Metal Organic Frameworks ◽  
Porous Metal ◽  
Porous Iron ◽  
Metal Organic ◽  
Supercritical Carbon

The scCO2-assisted loading of ibuprofen on nontoxic and biocompatible porous iron(iii) polycarboxylate metal–organic frameworks (MOFs) demonstrated high guest loading and controlled release of these materials.

Synthesis of platinum nanoparticles on substrates of various chemical natures using supercritical carbon dioxide

2017 ◽  
Vol 473 (1) ◽  
pp. 41-44 ◽  
Author(s):  
I. V. El’manovich ◽  
V. V. Zefirov ◽  
M. O. Gallyamov ◽  
Academician A. R. Khokhlov
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Platinum Nanoparticles ◽  
Supercritical Carbon
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