The influence of microwave radiation on hard rocks as in microwave assisted rock breakage applications

2014 ◽  
pp. 195-198 ◽  
Author(s):  
P Nekoovaght ◽  
F Hassani
Keyword(s):  
Microwave Radiation ◽  
Rock Breakage ◽  
Hard Rocks ◽  
Microwave Assisted

scholarly journals Parametric Study on Microwave-Assisted Pyrolysis Combined KOH Activation of Oil Palm Male Flowers Derived Nanoporous Carbons

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2876
Author(s):  
Napat Kaewtrakulchai ◽  
Kajornsak Faungnawakij ◽  
Apiluck Eiad-Ua
Keyword(s):  
Microwave Radiation ◽  
Oil Palm ◽  
Radiation Power ◽  
Operating Time ◽  
Bet Surface Area ◽  
Koh Activation ◽  
Nanoporous Carbons ◽  
Microwave Assisted ◽  
Activating Agent ◽  
Male Flowers

Oil palm male flowers (PMFs), an abundant agricultural waste from oil palm plantation in Thailand, have been utilized as an alternative precursor to develop nanoporous carbons (NPCs) via microwave-assisted pyrolysis combined potassium hydroxide (KOH) activation. The influences of relevant processing variables, such as activating agent ratio, microwave power, and activation time on the specific pore characteristics, surface morphology, and surface chemistry of PMFs derived nanoporous carbons (PMFCs) have been investigated to explore the optimum preparation condition. The optimum condition under a microwave radiation power of 700 W, activation holding time of 6 min, and activating agent ratio of 2:1 obtained the PMFC with the highest Brunauer–Emmett–Teller (BET) surface area and total pore volume approximately of 991 m2/g and 0.49 cm3/g, composed of a carbon content of 74.56%. Meanwhile, PMFCs have a highly microporous structure of about 71.12%. Moreover, activating agent ratio and microwave radiation power indicated a significant influence on the surface characteristics of PMFCs. This study revealed the potential of oil palm male flowers for the NPCs’ production via microwave-assisted KOH activation with a short operating-time condition.

scholarly journals Thermo-physical properties of selected hard rocks and their relation to microwave-assisted comminution

2016 ◽  
Vol 91 ◽  
pp. 34-41 ◽  
Author(s):  
P. Hartlieb ◽  
M. Toifl ◽  
F. Kuchar ◽  
R. Meisels ◽  
T. Antretter
Keyword(s):  
Physical Properties ◽  
Hard Rocks ◽  
Microwave Assisted ◽  
Thermo Physical Properties

Microwave-assisted one-step preparation of macadamia nut shell-based activated carbon for efficient adsorption of Reactive Blue

2017 ◽  
Vol 41 (24) ◽  
pp. 15373-15383 ◽  
Author(s):  
Chunfeng Du ◽  
Yongtao Xue ◽  
Zhansheng Wu ◽  
Zhilin Wu
Keyword(s):  
Activated Carbon ◽  
Microwave Radiation ◽  
Koh Activation ◽  
Microwave Assisted ◽  
Macadamia Nut ◽  
One Step

In this work, macadamia nut shell-based activated carbon (MNSAC) was prepared using macadamia nut shells (MNS) through KOH activation under microwave radiation.

scholarly journals Microwave assisted formation of monoreactive perfluoroalkylsilane-based self-assembled monolayers

2015 ◽  
Vol 51 (11) ◽  
pp. 2060-2063 ◽  
Author(s):  
Austin W. H. Lee ◽  
Brandy K. Pilapil ◽  
Him Wai Ng ◽  
Byron D. Gates
Keyword(s):  
Microwave Radiation ◽  
Silicon Oxide ◽  
Self Assembled Monolayers ◽  
Oxide Surfaces ◽  
Microwave Assisted ◽  
Assembled Monolayers ◽  
Self Assembled

We demonstrate the use of microwave radiation as a tool to accelerate the formation of perfluoroalkylsilane based self-assembled monolayers (SAMs) on silicon oxide surfaces.

scholarly journals Optimation of NaOH Catalyst Consentration on 1,3-Diphenyl-2-propen-1-on Synthesis Using Microwave-Assisted Organic Synthesis (MAOS) Method

2019 ◽  
Vol 4 (1) ◽  
pp. 25 ◽  
Author(s):  
Iin Narwanti ◽  
Narendra Bagus Kusumajati
Keyword(s):  
Gas Chromatography ◽  
Melting Point ◽  
Microwave Radiation ◽  
Organic Synthesis ◽  
Catalyst Concentration ◽  
Microwave Assisted

<p>with a variation of NaOH catalyst concentration has been done. The purpose of this study was to determine the concentration of NaOH catalyst in the synthesis of 1,3-diphenyl-2-propen-1-on using MAOS method which produced optimal yield. The synthesis of 1,3-diphenyl-2-propen-1-on using benzaldehyde and acetophenone was carried out using the MAOS method with NaOH catalyst. The variation of NaOH catalyst concentration was 10%, 20%, 30%, and 40%. Microwave radiation was carried out at 140 watts for 20 seconds. The purity of the synthesized 1,3-diphenyl-2-propen-1-on was tested by melting point, TLC, and gas chromatography. The structure of the synthesized 1,3-diphenyl-2-propen-1-on was characterized by FTIR, GC-MS and NMR. The results showed that the compound 1,3-diphenyl-2-propen-1-on can be synthesized from benzaldehyde and acetophenone using MAOS method. The obtained yield at varying catalyst concentrations of 10, 20, 30 and 40% were (50.58±1.84%, (69.20±1.58)%, (84.55±1.50)% and (90.60±0.96)%, respectively. The concentration of 40% NaOH catalyst produces the most optimal yield of synthesis products.</p><p> </p>

Optimization of Microwave-Assisted Extraction of Phenolic Compounds from Medicinal and Aromatic Plants: Sideritis raeseri, Sideritis scardica and Origanum vulgare

2020 ◽  
Vol 16 (2) ◽  
pp. 106-111
Author(s):  
Ioannis Sarakatsianos ◽  
Konstantinos Adamopoulos ◽  
Victoria Samanidou ◽  
Athanasia Goula ◽  
Elissavet Ninou
Keyword(s):  
Microwave Radiation ◽  
Plant Material ◽  
Extraction Yield ◽  
Microwave Assisted Extraction ◽  
Aromatic Plants ◽  
Origanum Vulgare ◽  
Medicinal And Aromatic Plants ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Phenolic Constituents

Background: Medicinal plants consist a rich source of natural pharmacologically active compounds. The aim of the current work, was the study and optimization of the extraction conditions of phenolic constituents from important medicinal and aromatic plants, id. Sideritis raeseri, Sideritis scardica and Origanum vulgare, implementing microwave assisted extraction technique. Methods: Optimization was based on various parameters affecting extraction procedure, such as the duration of microwave radiation, the ratio of plant material mass to the solvent, the type and the concentration of the solvent. Results: The results revealed that 10 min of microwave radiation provided the maximum extraction yield of the phenolic constituents. The ratio of the plant material mass and the solvent had minor effect to the extraction efficiency. Conclusion: The examined solvents provided an extraction yield of phenolic constituents following the order: EtOH<MeOH<H2O<MeOH:H2O (80:20, v/v)<EtOH:H2O (60:40, v/v), in the case of Sideritis raeseri and Sideritis scardica and the order: H2O<MeOH:H2O (80:20, v/v)<EtOH:H2O (60:40, v/v) < MeOH<EtOH in the case of Origanum vulgare.

Microwave Assisted Preparation of YAG and Yb:YAG Transparent Ceramic Nanopowders for Laser Crystal

2016 ◽  
Vol 697 ◽  
pp. 76-79 ◽  
Author(s):  
Wei Si ◽  
Cang Xiong ◽  
Yi Wen Jiang ◽  
Zhi Feng Xing ◽  
Wei Pan
Keyword(s):  
Microwave Radiation ◽  
Laser Crystal ◽  
Radiation Power ◽  
Average Particle Size ◽  
Thermo Gravimetric Analysis ◽  
Transparent Ceramic ◽  
Precipitation Method ◽  
Average Particle ◽  
Gravimetric Analysis ◽  
Microwave Assisted

YAG and Yb:YAG transparent ceramic nanopowders for laser crystal were synthesized by microwave-assisted alkoxide hydrolysis precipitation method. The YAG and Yb:YAG nanopowders were characterized by differential thermal analysis and thermo gravimetric analysis (DTA-TG), infrared spectrum (IR), X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and photoluminescence (PL) spectrum. The results show that the crystallizing temperature of the precursor of YAG and Yb:YAG is about 930 °C. The pure phase YAG and Yb:YAG nanopowders can be obtained at microwave radiation power of 385 W, microwave radiation time of 30 min and sintering temperature of 1100 °C. The average particle size of YAG is about 120 nm. Yb:YAG is uniform sphere and the average sizes is about 100 nm. The intensity of luminescence of Yb:YAG nanopowders decreased with the increasing of microware time. The maximum luminous intensity of the Yb:YAG nanopowders can be obtained when the microwave radiation is 30 min.

In situ picosecond transient diffuse reflectance spectroscopy of opaque TiO2 systems under microwave irradiation and influence of oxygen vacancies on the UV-driven/microwave-assisted TiO2 photocatalysis

2015 ◽  
Vol 3 (23) ◽  
pp. 5958-5969 ◽  
Author(s):  
Satoshi Horikoshi ◽  
Hideya Tsutsumi ◽  
Hiroyuki Matsuzaki ◽  
Akihiro Furube ◽  
Alexei V. Emeline ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Microwave Irradiation ◽  
Microwave Radiation ◽  
Oxygen Vacancies ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
Tio2 Photocatalysis ◽  
Microwave Assisted

Effect of microwave radiation on pristine TiO2 and oxygen-vacancy rich titania, Vo-TiO2.

scholarly journals Microwave-assisted preparation of almond shell-based activated carbon for methylene blue adsorption

2016 ◽  
Vol 5 (4) ◽  
Author(s):  
Chunfeng Du ◽  
Hongbing Yang ◽  
Zhansheng Wu ◽  
Xinyu Ge ◽  
Giancarlo Cravotto ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Microwave Radiation ◽  
Almond Shell ◽  
Methylene Blue Adsorption ◽  
Microwave Assisted

AbstractThis study reports the synthesis of a novel adsorbent, hereinafter named almond shell-based activated carbon (ASAC), from waste almond shells (AS) via exposure to microwave radiation and the use of ZnCl

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