scholarly journals Days Can Be Converted To Hours, Minutes or Even Seconds When Using Microwave Technology in the Lab

1995 ◽  
Vol 3 (5) ◽  
pp. 14-15
Author(s):  
Richard T. Giberson ◽  
Richard S. Demaree ◽  
Steven B. Lee ◽  
Michi Lee
Keyword(s):  
Aluminum Foil ◽  
Microwave Energy ◽  
Microwave Oven ◽  
Microwave Technology ◽  
Casual Observer

What happens when a cup of water and two ice cubes, contained in a bowl, are placed side by side in an 800 watt microwave oven and microwaved for two minutes at 100% power? The answer may not be obvious, even to the most ardent microwave user. The water will boil and the ice will remain essentially unmelted. This dichotomy of the results may appear puzzling to the casual observer, or may explain why your food does not defrost quite evenly. To the microwave, however, it all makes sense. Water is a dielectric and absorbs microwave energy. The net result is that it heats up. The ice under the above conditions is essentially transparent to the microwave and does not heat. It would take an ice wall greater than 30 meters thick (3.4 cm for 25° C water) to protect you from the microwave energy emitted by the standard household microwave, whereas a >170 nm thick piece of aluminum foil is all that is required to reflect that same energy.

scholarly journals Microwave Mechanisms — The Energy/Heat Dichoto

2004 ◽  
Vol 12 (2) ◽  
pp. 18-23 ◽  
Author(s):  
Jose J. Galvez ◽  
Richard T. Giberson ◽  
Robert D. Cardiff
Keyword(s):  
Biological Sciences ◽  
Microwave Energy ◽  
Microwave Oven ◽  
Chemical Processes ◽  
Antigen Retrieval ◽  
Microwave Technology ◽  
Plastic Embedding ◽  
Speed Up ◽  
Histological Staining

The current use of microwave technology in science creates a dichotomy. Is it the heat or is it the energy? One entire branch of science, chemistry, uses microwave energy to apply heat to a broad range of chemical processes, under pressure, to produce the desired end-products quickly and efficiently (1). The biological sciences, surgical pathology in particular, have tried to adapt the microwave oven to speed up a broad range of processes: fixation, decalcification, antigen retrieval, tissue processing for paraffin and plastic embedding, and histological staining, including special stains, immunolabeling, and in situ hybridization (2). The biologists have assumed that they are also applying heat to speed processing. However, recent improvements in the microwave suggest that the energy is the critical variable (9). We have designed fixation experiments to test the two views.

The Study on Organic Acid Detection Using Lon Chromatography

2012 ◽  
Vol 424-425 ◽  
pp. 923-926
Author(s):  
Xiao Jian Hu ◽  
Wen Chen ◽  
Li Li ◽  
Jin Ping Zhou ◽  
Bao Shou Guo ◽  
...  
Keyword(s):  
Drinking Water ◽  
Convenient Method ◽  
High Sensitivity ◽  
Microwave Oven ◽  
Good Recovery ◽  
Microwave Technology ◽  
Trace Level ◽  
Recovery Treatment ◽  
Technology Foundation

A simple and convenient method for the determination of μ g/l level in the real drinking water bromate overcome traditional methods of defects. Argentina by electrolyzing the smallest electrode interference and then focus on extra chlorine use microwave technology foundation evaporation and concentration, the proposed method is very sensitive to the determination of trace level of the sales of the drinking water. And a microwave oven, drinking water ten times the sample can be concentrated in 10 minutes can get and good recovery. Treatment of the silver electrode, the method of interference, and can effectively eliminate the Cl- This method is successfully applied to the detection in water sample level in the trace. It is the advantage of the operation is simple, fast, high sensitivity, accurate results. This method can be applied widely, suitable for trace analysis of water samples.

Study on Microwave Curing of Radioactive Waste

2013 ◽  
Author(s):  
Yanze Xu ◽  
Yan Ma ◽  
Yanni Wei ◽  
Chenlin Lu
Keyword(s):  
Nuclear Waste ◽  
Thermal Effects ◽  
Microwave Frequency ◽  
Optical Microscope ◽  
Microwave Oven ◽  
Heating Period ◽  
Microwave Technology ◽  
Primary Loop ◽  
Microwave Curing ◽  
Main Component

Processing of nuclear waste has become an important issue nowadays. A microwave waste disposal method for solid waste mainly containing Ni, Fe element and their oxide produced in the primary loop is investigated in this article. The powder waste, which is treated as absorber of microwave and energy source for curing, was doped in the curing agent that using SiO2 as a main component. In the experiment, using a household microwave oven (Microwave-frequency: 2.45GHz, Output power: 700W), thermal effects and non-thermal effects make samples heated to a high temperature quickly and then curing. In order to evaluate the effect parameters including different doping ingredient, heating period, pressure were changed. A pressure is applied to make a better curing effect. After curing, the measurement of the density of the cured body was made. The microstructure of the samples was observed with an optical microscope, and the cured body composition was analyzed by XRD and SEM. The results show that samples are sintered quickly with less than 15 minutes and the cured body has a good performance. It’s therefor that microwave technology can be an effective way to dispose microwave absorbing substances such as Fe, Ni-containing powder waste.

Performance of Some Heat-Sensitive Differential Agars Prepared and Melted by Microwave Energy1

1988 ◽  
Vol 51 (7) ◽  
pp. 577-578 ◽  
Author(s):  
C. LIANG ◽  
D. Y. C. FUNG
Keyword(s):  
Escherichia Coli ◽  
Cell Count ◽  
Viable Cell ◽  
Microwave Energy ◽  
Microwave Oven ◽  
Viable Cell Count ◽  
Streptococcus Faecalis ◽  
Cell Counts ◽  
Significant Difference ◽  
Conventional Boiling

The viable cell count performance of some heat-sensitive differential agars prepared and remelted by microwave energy was evaluated for Salmonella choleraesui, Streptococcus faecalis and Escherichia coli. The conventional boiling method was used for comparison. No significant difference was found between the microwave oven processed agar and the conventional-boiling processed agar in viable cell counts of the target bacteria. Heating and reheating of violet red bile agar, bismuth sulfite agar, and KF Streptococcus agar by both methods did not change agar performance. However, remelting of desoxycholate citrate agar by both methods resulted in a substantial lowering of viable cell counts.

Use of Microwave Energy for Obtaining the Mullite

2010 ◽  
Vol 660-661 ◽  
pp. 893-898
Author(s):  
Maria Isabel Brasileiro ◽  
Lisiane Navarro de Lima Santana ◽  
Gelmires Araújo Neves ◽  
Romualdo Rodrigues Menezes ◽  
Hélio Lucena Lira ◽  
...  
Keyword(s):  
High Temperatures ◽  
Microwave Energy ◽  
Microwave Oven ◽  
Rare Occurrence ◽  
Mullite Phase ◽  
Conventional Methods ◽  
Synthesis Of Materials

The kaolin beneficiation industries produce waste that is rich in Al2O3 and SiO2, oxides that when sintered at high temperatures react to form mullite. Due to the rare occurrence of the mullite mineral in nature, the number of studies in order to obtain it has been growing in recent years due to its properties excellent. This study aims to examine the feasibility of the use of microwave energy as an alternative to synthesize mullite from kaolin residue, since the use of microwave energy in the synthesis of materials has gained importance for the speed and economy when compared to conventional methods. The compositions studied (residual kaolin + alumina) were established according to the stoichiometry of mullite. The samples were sintered in a microwave oven home changed, varying power and time. It was observed that with the increase of these variables the intensity of the peaks of the mullite phase increased.

scholarly journals Microwave usage and cancer: Do microwaves cause cancer?

2021 ◽  
Author(s):  
Muhammad Abdullah Al Azam Abd Rahman ◽  
Zairina A Rahman
Keyword(s):  
Rapid Development ◽  
Microwave Frequency ◽  
Microwave Energy ◽  
Microwave Oven ◽  
The Body ◽  
Surrounding Tissue ◽  
Frequency Range ◽  
Modern Life ◽  
Electrical Appliance ◽  
Fast Lane

Materials containing water, for example foods, fluids or tissues, absorb microwave energy readily, which is then converted into heat. This principle is applied in microwave ovens, an electrical appliance that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range. Amidst the hustle and bustle of modern life, the microwave oven has been a great help, as the rapid development of technology keeps consumers in the fast lane. Cancer is defined as the uncontrolled growth and spread of cells. It can affect almost any part of the body. The growths often invade surrounding tissue and can metastasize to distant sites. In this paper, we will explore the function of microwave ovens, the pathophysiology of cancer, and whether is there any evidence of a relationship between microwave ovens and cancer.

scholarly journals Impact of Microwave Treatment on Chemical Constituents in Fresh Rhizoma Gastrodiae (Tianma) by UPLC-MS Analysis

2014 ◽  
Vol 2014 ◽  
pp. 1-10
Author(s):  
Qimeng Fan ◽  
Chaoyin Chen ◽  
Dingqi Xie ◽  
Shenglan Zhao
Keyword(s):  
Chemical Composition ◽  
Chinese Medicine ◽  
Traditional Chinese Medicine ◽  
Chemical Constituents ◽  
Microwave Treatment ◽  
Microwave Oven ◽  
Chemical Component ◽  
Vanillyl Alcohol ◽  
Microwave Technology ◽  
Active Compounds

Fresh Rhizoma Gastrodiae (Tianma) was processed in a microwave oven at 2450 MHz in order to study the effect on the main chemical component changes taking place during microwave treatment. It was found that microwave affected the chemical composition of Tianma. Seven compounds, including gastrodin, gastrodigenin (p-hydroxybenzylalcohol), p-hydroxybenzaldehyde, vanillyl alcohol, vanillin, adenine, and 5-hydroxymethylfurfural, were identified in this study. As major active compounds, the contents of gastrodin and gastrodigenin in MWT Tianma were both twice as much as those in raw Tianma. Besides, the MS data show that there are still some unidentified compositions in Tianma, and there are also many converted compounds in MWT Tianma, which is worthy of further work. The results have indicated that microwave treated fresh Tianma might be helpful in designing the processing of traditional Chinese medicine and the application of microwave technology in traditional Chinese medicine needs to be researched further in the future.

Frozen Storage and Microwave Thawing of Parenteral Nutrition Solutions in Plastic Containers

1981 ◽  
Vol 15 (6) ◽  
pp. 440-443 ◽  
Author(s):  
R.K. Ausman ◽  
K. Kerkhof ◽  
C.J. Holmes ◽  
R. Cantwell ◽  
R.B. Kundsin ◽  
...  
Keyword(s):  
Amino Acid ◽  
Parenteral Nutrition ◽  
Low Temperatures ◽  
Frozen Storage ◽  
Cost Savings ◽  
Microwave Energy ◽  
Microwave Oven ◽  
Plastic Containers

Amino acid-dextrose solutions for parenteral nutrition in flexible plastic containers can be stored for prolonged periods at — 20°C and then thawed immediately before anticipated use in a microwave oven. The purpose of this study was to demonstrate that neither exposure to low temperatures nor microwave energy affects the integrity of the solution components. We have demonstrated that this concept can be applied to the development of an efficient, pharmacy-based parenteral nutrition admixture program, unfettered by constraints of production limitations and the requirements for infusion of admixtures within 24 hours of preparation. Some cost savings may accrue.

scholarly journals Current Trends in the Development of Microwave Reactors for the Synthesis of Nanomaterials in Laboratories and Industries: A Review

Crystals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 379 ◽  
Author(s):  
Sylwia Dąbrowska ◽  
Tadeusz Chudoba ◽  
Jacek Wojnarowicz ◽  
Witold Łojkowski
Keyword(s):  
Construction Material ◽  
Microwave Sintering ◽  
Microwave Energy ◽  
Inorganic Materials ◽  
Synthetic Methods ◽  
Microwave Devices ◽  
Maximum Pressure ◽  
Microwave Technology ◽  
Microwave Reactors ◽  
Synthesis Of Nanomaterials

Microwave energy has been in use for many applications for more than 50 years, from communication, food processing, and wood drying to chemical reactions and medical therapy. The areas, where microwave technology is applied, include drying, calcination, decomposition, powder synthesis, sintering, and chemical process control. Before the year 2000, microwaves were used to produce ceramics, semiconductors, polymers, and inorganic materials; in next years, some new attempts were made as well. Nowadays, it has been found that microwave sintering can also be applied to sintered powder and ceramics and is more effective than conventional sintering. Particularly interesting is its use for the synthesis of nanomaterials. This review identifies the main sources of microwave generation, the delivery mechanisms of microwave energy, and the typical designs and configurations of microwave devices, as well as the measurement and construction material problems related to microwave technology. We focus our attention on the configurations, materials, optimized geometries, and solvents used for microwave devices, providing examples of products, especially nanoparticles and other nanomaterials. The identified microwave devices are divided into four groups, depending on the scale, the maximum pressure developed, the highest temperature for sintering, or other special multi-functions. The challenges of using microwave energy for the synthesis of nanopowders have been identified as well. The desirable characteristics of microwave reactors in the synthesis of nanostructures, as well as their superiority over conventional synthetic methods, have been presented. We have also provided a review of the commercial and self-designed microwave reactors, digestors, and sintering furnaces for technology for synthesis of nanomaterials and other industries.

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