scholarly journals Sustainable Development of Carbon Nanocomposites: Synthesis and Classification for Environmental Remediation

2021 ◽  
Vol 2021 ◽  
pp. 1-21
Author(s):  
Dhinakaran Veeman ◽  
M. Varsha Shree ◽  
P. Sureshkumar ◽  
T. Jagadeesha ◽  
L. Natrayan ◽  
...  
Keyword(s):  
Environmental Remediation ◽  
Carbon Nanomaterials ◽  
Mechanical Performance ◽  
Hydrogen Sensors ◽  
Processing Technologies ◽  
Solar Hydrogen ◽  
Carbon Nanocomposites ◽  
Methods Of Synthesis ◽  
Carbon Nanocomposite ◽  
Made In

Composite materials with carbon nanotube and graphene attachments have been regarded as promising prospects. Carbon nanocomposites have gained considerable interest in different fields including biomedical applications due to its exceptional structural dimensions and outstanding mechanical, electrical, thermal, optical, and chemical characteristics. The significant advances made in carbon nanocomposite over past years along with the discovery of new nanocomposite processing technologies to improvise the functional impact of nanotube and graphene composites by providing proper methods of synthesis and improving the production of diverse composite based on carbon nanomaterials are discussed. Carbon nanocomposites are applied in various fields such as aviation, batteries, chemical industry, fuel cell, optics, power generation, space, solar hydrogen, sensors, and thermoelectric devices. The recent design, fabrication, characteristics, and applications of carbon nanocomposites such as active carbon, carbon black, graphene, nanodiamonds, and carbon nanotubes are explained in detail in this research. It is found that unlike traditional fiber composites, Van der Waals force interfacial compounds have an important effect on the mechanical performance of carbon nanomaterial-based composites.

scholarly journals Mortars with CDW Recycled Aggregates Submitted to High Levels of CO2

2021 ◽  
Vol 6 (11) ◽  
pp. 159
Author(s):  
Ricardo Infante Gomes ◽  
David Bastos ◽  
Catarina Brazão Farinha ◽  
Cinthia Maia Pederneiras ◽  
Rosário Veiga ◽  
...  
Keyword(s):  
Large Scale ◽  
Mechanical Performance ◽  
Construction Materials ◽  
Environmental Benefits ◽  
Recycled Aggregates ◽  
Construction And Demolition Wastes ◽  
Short Period ◽  
Natural Aggregates ◽  
Cement Factories ◽  
Made In

Construction and demolition wastes (CDW) are generated at a large scale and have a diversified potential in the construction sector. The replacement of natural aggregates (NA) with CDW recycled aggregates (RA) in construction materials, such as mortars, has several environmental benefits, such as the reduction in the natural resources used in these products and simultaneous prevention of waste landfill. Complementarily, CDW have the potential to capture CO2 since some of their components may carbonate, which also contributes to a decrease in global warming potential. The main objective of this research is to evaluate the influence of the exposure of CDW RA to CO2 produced in cement factories and its effect on mortars. Several mortars were developed with a volumetric ratio of 1:4 (cement: aggregate), with NA (reference mortar), CDW RA and CDW RA exposed to high levels of CO2 (CRA). The two types of waste aggregate were incorporated, replacing NA at 50% and 100% (in volume). The mortars with NA and non-carbonated RA and CRA from CDW were analysed, accounting for their performance in the fresh and hardened states in terms of workability, mechanical behaviour and water absorption by capillarity. It was concluded that mortars with CDW (both CRA and non-carbonated RA) generally present a good performance for non-structural purposes, although they suffer a moderate decrease in mechanical performance when NA is replaced with RA. Additionally, small improvements were found in the performance of the aggregates and mortars with CRA subjected to a CO2 curing for a short period (5 h), while a long carbonation period (5 d) led to a decrease in performance, contrary to the results obtained in the literature that indicate a significant increase in such characteristics. This difference could be because the literature focused on made-in-laboratory CDW aggregates, while, in this research, the wastes came from real demolition activities, and were thus older and more heterogeneous.

scholarly journals Biotransformation of Pristine and Oxidized Carbon Nanotubes by the White Rot Fungus Phanerochaete chrysosporium

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1340 ◽  
Author(s):  
Qiang Ma ◽  
Ailimire Yilihamu ◽  
Zhu Ming ◽  
Shengnan Yang ◽  
Mengyao Shi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Phanerochaete Chrysosporium ◽  
Environmental Remediation ◽  
Carbon Nanomaterials ◽  
Carbon Skeleton ◽  
White Rot ◽  
White Rot Fungus ◽  
Multiwalled Carbon ◽  
Complete Degradation

Carbon nanomaterials are widely studied and applied nowadays, with annual production increasing. After entering the environment, the complete degradation of these carbon nanomaterials by microorganisms is proposed as an effective approach for detoxification and remediation. In this study, we evaluated the degradation of pristine multiwalled carbon nanotubes (p-MWCNTs) and oxidized multiwalled carbon nanotubes (o-MWCNTs) by the white rot fungus Phanerochaete chrysosporium, which is a powerful decomposer in the carbon cycle and environmental remediation. Both p-MWCNTs and o-MWCNTs were partially oxidized by P. chrysosporium as indicated by the addition of oxygen atoms to the carbon skeleton in the forms of C=O and O–H bonds. The fungal oxidation led to the shortening of MWCNTs, where precipitated o-MWCNTs showed more short tubes. During the transformation, the defects on the tubes became detached from the carbon skeleton, resulting in decreases of the ID/IG (intensity of D-band/ intensity of G-band) values in Raman spectra. The transformation mechanism was attributed to the enzymatic degradation by laccase and manganese peroxidase excreted by P. chrysosporium. The results collectively indicated that MWCNTs could be transformed by P. chrysosporium, but complete degradation could not be achieved in a short time period. The implications on the environmental risks of carbon nanomaterials are discussed.

Application of Ceramics Metal Functionally Graded Materials on Green Automobiles

2007 ◽  
Vol 280-283 ◽  
pp. 1925-0 ◽  
Author(s):  
Yong Li ◽  
Song Jian ◽  
Zhi Min
Keyword(s):  
Functionally Graded Materials ◽  
Comparative Research ◽  
Mechanical Performance ◽  
Friction Pair ◽  
Functionally Graded ◽  
Graded Materials ◽  
Sealing Performance ◽  
Traditional Ceramics ◽  
External Characteristics ◽  
Made In

Ceramics metal functionally graded materials (FGM) is applied on the dual friction pair of the green automobiles. The structure and component characteristics of FGM are better, compared with traditional Ceramics. Even with the same components, FGM bears an outstanding mechanical performance and its cracking strength, toughness and fatigue strength are relatively superior. The influence of Ceramics metal functionally graded materials on the performance of automobiles are analyzed via a comparative research and comparison of the external characteristics of automobile is made in terms of mechanism. The results indicate that the power output, fuel consumption and durability are improved considerably on the green automobiles. Improvement is also made on the wearing capability, lubricity and sealing performance as well. Hence comes the reduction of friction loss and leakage loss. The principal abrasion mechanism of FGM is plastic flowing and the secondary are brittle failure and grain abrasion.

scholarly journals 3D Printing of Fibre-Reinforced Thermoplastic Composites Using Fused Filament Fabrication—A Review

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2188
Author(s):  
Andrew N. Dickson ◽  
Hisham M. Abourayana ◽  
Denis P. Dowling
Keyword(s):  
3D Printing ◽  
Polymer Composites ◽  
Mechanical Performance ◽  
Polymer Processing ◽  
Thermoplastic Composites ◽  
Fused Filament Fabrication ◽  
Compression Moulding ◽  
Processing Technologies ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer

Three-dimensional (3D) printing has been successfully applied for the fabrication of polymer components ranging from prototypes to final products. An issue, however, is that the resulting 3D printed parts exhibit inferior mechanical performance to parts fabricated using conventional polymer processing technologies, such as compression moulding. The addition of fibres and other materials into the polymer matrix to form a composite can yield a significant enhancement in the structural strength of printed polymer parts. This review focuses on the enhanced mechanical performance obtained through the printing of fibre-reinforced polymer composites, using the fused filament fabrication (FFF) 3D printing technique. The uses of both short and continuous fibre-reinforced polymer composites are reviewed. Finally, examples of some applications of FFF printed polymer composites using robotic processes are highlighted.

Organic dye-sensitized TiO2 as a versatile photocatalyst for solar hydrogen and environmental remediation

2012 ◽  
Vol 121-122 ◽  
pp. 206-213 ◽  
Author(s):  
Sung Kyu Choi ◽  
Hyun Sik Yang ◽  
Jae Hong Kim ◽  
Hyunwoong Park
Keyword(s):  
Environmental Remediation ◽  
Organic Dye ◽  
Solar Hydrogen ◽  
Dye Sensitized

Synthesis of urchin-like rutile titania carbon nanocomposites by iron-facilitated phase transformation of MXene for environmental remediation

2016 ◽  
Vol 4 (2) ◽  
pp. 489-499 ◽  
Author(s):  
Guodong Zou ◽  
Jianxin Guo ◽  
Qiuming Peng ◽  
Aiguo Zhou ◽  
Qingrui Zhang ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Environmental Remediation ◽  
Adsorption Mechanism ◽  
Adsorption Ability ◽  
Carbon Nanocomposites ◽  
2D Material ◽  
Rutile Titania

A novel 2D material is prepared byin situphase transformation of layered MXene with the induction of Fe(iii) ion. The urchin-like rutile TiO2–C nanocomposite with a high amount of (110) facets exhibits a high Cr(vi) adsorption ability of ~225 mg g−1, which is the highest value based on a simple adsorption mechanism reported so far

A facile synthesis of a uniform constitution of three-dimensionally ordered macroporous TiO2–carbon nanocomposites with hierarchical pores for lithium ion batteries

2015 ◽  
Vol 3 (13) ◽  
pp. 6862-6872 ◽  
Author(s):  
Lihong Song ◽  
Ling Li ◽  
Xin Gao ◽  
Jiaxin Zhao ◽  
Ting Lu ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Facile Synthesis ◽  
Carbon Nanocomposites ◽  
Storage Performance ◽  
Hierarchical Pores ◽  
Ion Storage ◽  
Ordered Macroporous ◽  
Carbon Nanocomposite

A novel 3DOM TiO2–carbon nanocomposite is fabricated via a simple multicomponent infiltration of three-dimensionally ordered templates, and exhibits superior lithium ion storage performance.

scholarly journals Analyzing the Impact of Corporate Governance Factors on Enterprise Value and Capitalization

2021 ◽  
Vol 26 (3) ◽  
pp. 291-309
Author(s):  
Ol'ga D. KOSORUKOVA
Keyword(s):  
Corporate Governance ◽  
Value Management ◽  
Financial Indicators ◽  
Business Valuation ◽  
Enterprise Value ◽  
Value Based Management ◽  
Methods Of Synthesis ◽  
The Impact ◽  
Made In

Subject. The article focuses on business valuation methods and factors with reference to corporate governance principles. Objectives. I analyze how corporate governance factors influence the value and capitalization of public joint-stock companies, and make my suggestions concerning financial and administrative decisions in line with value-based management. Methods. The study is based on methods of synthesis, deduction, induction, statistical analysis, comparison and generalization. Results. Having analyzed the impact of such factors, as revenue, dividends paid, return on sale and equity, for an 11-year life span (2009–2019), on capitalization and value of the population made up of 20 Russian public joint-stock companies from four sectors, as classified by the number of owners and State interest, I figured out that capitalization enterprise value in Russia most of all depend on indicators of companies if it has 11 owners and more (71%), companies without the State interest (67%). As for basic factors, these are revenue and dividend policy that have the strongest effect on enterprise value, while capitalization depends on all the analyzable factors. Conclusions and Relevance. Currently, business valuation and business valuation management are critical for making correct strategic administrative decision. Doing so, the appraiser shall not only measure enterprise value with available financial results, but also consider its various non-financial indicators, which inter alia include corporate governance. Based on corporate governance principles set forth in the Letter of the Bank of Russia, I pointed out that definitely influence the enterprise value. Based on the above analysis, I determined what best results the Russian public joint-stock companies can attain in their corporate governance by sector, the number and quality of owners. Following the findings, I suggest how financial and administrative decisions on enterprise value management should be made, in line with the value-based management principles.

Sign in / Sign up

Export Citation Format

Share Document