Preparation of high-quality graphene using triggered microwave reduction under an air atmosphere

Zirconium based Metal-Organic Framework UiO-66 is to date considered one of the benchmark compound among stable MOFs and it has attracted a huge attention for its employment in many strategic applications. Large scale production of UiO-66 for industrial purposes requires the use of safe and green solvents, fulfilling the green chemistry principles and able to replace the use of N,N-Dimethyl-Formamide (DMF), which, despite its toxicity, is still considered the most efficient solvent for obtaining UiO-66 of high quality. Herein we report on a survey of about 40 different solvents with different polarity, boiling point and acidity, used for the laboratory scale synthesis of high quality UiO-66 crystals. The solvents were chosen according the European REACH Regulation 1907/2006 among those having low cost, low toxicity and fully biodegradable. Concerning MOF synthesis, the relevant parameters chosen for establishing the quality of the results obtained are the degree are the crystallinity, microporosity and specific surface area, yield and solvent recyclability. Taking into account also the chemical physical properties of all the solvents, a color code was assigned in order to give a final green assessment for the UiO-66 synthesis. Defectivity of the obtained products, the use of acidic modulators and the use of alternative Zr-salts have been also taken into consideration. Preliminary results lead to conclude that GVL (γ-valerolactone) is among the most promising solvents for replacing DMF in UiO-66 MOF synthesis.

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Extensive Screening of Green Solvents for Safe and Sustainable UiO-66 Synthesis

10.26434/chemrxiv.12745097.v1 ◽

2020 ◽

Author(s):

Diletta Morelli Venturi ◽

Filippo Campana ◽

Fabio Marmottini ◽

Ferdinando Costantino ◽

Luigi Vaccaro

Keyword(s):

Large Scale ◽

Low Cost ◽

Metal Organic Framework ◽

Dimethyl Formamide ◽

Scale Production ◽

Green Solvents ◽

High Quality ◽

Color Code ◽

Large Scale Production ◽

Metal Organic

Zirconium based Metal-Organic Framework UiO-66 is to date considered one of the benchmark compound among stable MOFs and it has attracted a huge attention for its employment in many strategic applications. Large scale production of UiO-66 for industrial purposes requires the use of safe and green solvents, fulfilling the green chemistry principles and able to replace the use of N,N-Dimethyl-Formamide (DMF), which, despite its toxicity, is still considered the most efficient solvent for obtaining UiO-66 of high quality. Herein we report on a survey of about 40 different solvents with different polarity, boiling point and acidity, used for the laboratory scale synthesis of high quality UiO-66 crystals. The solvents were chosen according the European REACH Regulation 1907/2006 among those having low cost, low toxicity and fully biodegradable. Concerning MOF synthesis, the relevant parameters chosen for establishing the quality of the results obtained are the degree are the crystallinity, microporosity and specific surface area, yield and solvent recyclability. Taking into account also the chemical physical properties of all the solvents, a color code was assigned in order to give a final green assessment for the UiO-66 synthesis. Defectivity of the obtained products, the use of acidic modulators and the use of alternative Zr-salts have been also taken into consideration. Preliminary results lead to conclude that GVL (γ-valerolactone) is among the most promising solvents for replacing DMF in UiO-66 MOF synthesis.

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Thermoelectric Performance of Mechanically Mixed BixSb2-xTe3—ABS Composites

Materials ◽

10.3390/ma14071706 ◽

2021 ◽

Vol 14 (7) ◽

pp. 1706

Author(s):

Zacharias Viskadourakis ◽

Argiri Drymiskianaki ◽

Vassilis M. Papadakis ◽

Ioanna Ioannou ◽

Theodora Kyratsi ◽

...

Keyword(s):

Polymer Composites ◽

Large Scale ◽

Low Cost ◽

Acrylonitrile Butadiene Styrene ◽

Thermoelectric Performance ◽

Scale Production ◽

Bismuth Antimony Telluride ◽

Mechanical Mixing ◽

Large Scale Production ◽

Bi Doping

In the current study, polymer-based composites, consisting of Acrylonitrile Butadiene Styrene (ABS) and Bismuth Antimony Telluride (BixSb2−xTe3), were produced using mechanical mixing and hot pressing. These composites were investigated regarding their electrical resistivity and Seebeck coefficient, with respect to Bi doping and BixSb2-xTe3 loading into the composite. Experimental results showed that their thermoelectric performance is comparable—or even superior, in some cases—to reported thermoelectric polymer composites that have been produced using other complex techniques. Consequently, mechanically mixed polymer-based thermoelectric materials could be an efficient method for low-cost and large-scale production of polymer composites for potential thermoelectric applications.

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Rapid Effective Reduction by Microwave-Irradiated Thermal Reaction for Large-Scale Production of High-Quality Reduced Graphene Oxide

SSRN Electronic Journal ◽

10.2139/ssrn.3935546 ◽

2021 ◽

Author(s):

Ok-Kyung Park ◽

Nam Hoon Kim ◽

Joong Hee Lee

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Large Scale ◽

Thermal Reaction ◽

Scale Production ◽

High Quality ◽

Large Scale Production ◽

Reduced Graphene ◽

Effective Reduction

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Thermal Laser Separation – A Novel Dicing Technology Fulfilling the Demands of Volume Manufacturing of 4H-SiC Devices

Materials Science Forum ◽

10.4028/www.scientific.net/msf.821-823.528 ◽

2015 ◽

Vol 821-823 ◽

pp. 528-532 ◽

Cited By ~ 5

Author(s):

Dirk Lewke ◽

Karl Otto Dohnke ◽

Hans Ulrich Zühlke ◽

Mercedes Cerezuela Barret ◽

Martin Schellenberger ◽

...

Keyword(s):

Experimental Data ◽

Process Control ◽

Tool Wear ◽

Large Scale ◽

State Of The Art ◽

Scale Production ◽

High Quality ◽

Large Scale Production ◽

Laser Separation

One challenge for volume manufacturing of 4H-SiC devices is the state-of-the-art wafer dicing technology – the mechanical blade dicing which suffers from high tool wear and low feed rates. In this paper we discuss Thermal Laser Separation (TLS) as a novel dicing technology for large scale production of SiC devices. We compare the latest TLS experimental data resulting from fully processed 4H-SiC wafers with results obtained by mechanical dicing technology. Especially typical product relevant features like process control monitoring (PCM) structures and backside metallization, quality of diced SiC-devices as well as productivity are considered. It could be shown that with feed rates up to two orders of magnitude higher than state-of-the-art, no tool wear and high quality of diced chips, TLS has a very promising potential to fulfill the demands of volume manufacturing of 4H-SiC devices.

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Large-scale production of high-quality reduced graphene oxide

Chemical Engineering Journal ◽

10.1016/j.cej.2013.08.050 ◽

2013 ◽

Vol 233 ◽

pp. 297-304 ◽

Cited By ~ 34

Author(s):

Shichoon Lee ◽

Sung Hun Eom ◽

Jin Suk Chung ◽

Seung Hyun Hur

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Large Scale ◽

Scale Production ◽

High Quality ◽

Large Scale Production ◽

Reduced Graphene

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Low-cost Large Scale Vermicompost Unit

Journal of Physics Conference Series ◽

10.1088/1742-6596/2115/1/012026 ◽

2021 ◽

Vol 2115 (1) ◽

pp. 012026

Author(s):

Sonam Solanki ◽

Gunendra Mahore

Keyword(s):

Large Scale ◽

Low Cost ◽

Small Scale ◽

Scale Production ◽

Key Innovation ◽

Main Challenge ◽

Long Run ◽

Large Scale Production ◽

Term Maintenance

Abstract In the current process of producing vermicompost on a large-scale, the main challenge is to keep the worms alive. This is achieved by maintaining temperature and moisture in their living medium. It is a difficult task to maintain these parameters throughout the process. Currently, this is achieved by building infrastructure but this method requires a large initial investment and long-run maintenance. Also, these methods are limited to small-scale production. For large-scale production, a unit is developed which utilises natural airflow with water and automation. The main aim of this unit is to provide favourable conditions to worms in large-scale production with very low investment and minimum maintenance in long term. The key innovation of this research is that the technology used in the unit should be practical and easy to adopt by small farmers. For long-term maintenance of the technology lesser number of parts are used.

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Porous micro-spherical LiFePO4/CNT nanocomposite for high-performance Li-ion battery cathode material

RSC Advances ◽

10.1039/c5ra05988g ◽

2015 ◽

Vol 5 (47) ◽

pp. 37830-37836 ◽

Cited By ~ 12

Author(s):

Wei Wei ◽

Linlin Guo ◽

Xiaoyang Qiu ◽

Peng Qu ◽

Maotian Xu ◽

...

Keyword(s):

Electrochemical Performance ◽

Cathode Material ◽

High Performance ◽

Large Scale ◽

Low Cost ◽

Scale Production ◽

Li Ion Battery ◽

Excellent Performance ◽

Large Scale Production ◽

Li Ion

Although many routes have been developed that can efficiently improve the electrochemical performance of LiFePO4 cathodes, few of them meet the urgent industrial requirements of large-scale production, low cost and excellent performance.

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Nanocrystalline Materials for Hybrid Photovoltaic Devices

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1116.45 ◽

2015 ◽

Vol 1116 ◽

pp. 45-50

Author(s):

Tarek I.A. Mashreki ◽

Mohammad Afzaal

Keyword(s):

Solar Cells ◽

Large Scale ◽

Low Cost ◽

Scale Production ◽

Photovoltaic Devices ◽

Large Scale Production ◽

Semiconductor Nanomaterials ◽

Inorganic Semiconductor ◽

Thin Film Composites ◽

Film Composites

Nanocomposites containing inorganic semiconductor nanomaterials are of tremendous interest for low-cost 3rd generation solar cells. A variety of possible materials and structures could be potentially used to reduce processing costs which is highly attractive for large scale production of solar cells. Controlling the morphology and surface chemistry of nanomaterials remains a key challenge that has major knock-on effects in devices. Herein, an attempt is made to highlight some of the challenges and the possible solutions for depositing high quality thin film composites for solar cell devices.

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