New Material Research: Electromagnetic Shielding / Absorbing Materials
Electromagnetic radiation can affect or destroy sensitive military equipment devices, make radio communications systems; weapons combat platforms failure or loss of control. In addition, electronic devices emit electromagnetic waves may induce certain diseases, such as lack of sleep, dizziness, vomiting, some studies point to electromagnetic radiation-induced cancer, cardiovascular disease and other incentives. Therefore, the study of electromagnetic shielding / absorbing materials, concern the academic industry.
Graphene
Traditional metal-based material is present in high density shielding, structural design problems and other issues, applications are restricted. Polymer / absorbent composite has better design resistance, can partially solve the technical bottleneck electrically shielded metal-based materials. Among them, the polymer-based foam structure with micro-electromagnetic shielding / absorbing material is a hot research direction in recent years.
The cell structure gives the advantage of electromagnetic shielding / light absorbing material, the foam generated during bidirectional stretching, secondary dispersion conducive absorbent polymer matrix. Meanwhile, the cell is introduced into the structure of the electromagnetic wave can labyrinth structure; thereby significantly improve the effectiveness of the shielding material, electromagnetic leakage, however. And a polymer resin itself has no electromagnetic shielding / absorbing properties, must be achieved by applying a large number of absorbers, the absorber is generally added ferrite, carbon materials, etc., but these absorbents incompatible with the polymer matrix capacitive, may cause the absorbent polymer matrix can be completely infiltration.
Carbon material graphene has excellent electromagnetic shielding / absorbing properties. Graphene properties, especially a CVD process for the preparation of such close proximity to the "perfect", and no affinity for the polymer, and is difficult to uniformly dispersed in the polymer matrix. Research team, through regulation of graphite oxide content of volatile substances, the successful implementation of the low pressure stripping graphite oxide was prepared graphene oxide contains a lot of oxygen-containing groups, or to enter the practical stage.
Polyimide Micro Foam
Using graphene oxide rich phase separation process by the success / graphene composite oxide-containing group, a blend of researchers to improve upon the graphene oxide in the thermoplastic polyimide resin dispersed polyimide introduced in a uniform cell material structure. The study found that the process of stretching of the polymer micro-foam is formed in situ, the only help of the secondary dispersion of graphene, graphene can also promote the cell structure around the alignment. Micro-foam material, the amount of graphene oxide may be up to 10wt%, the material density of about 0.3g/cm3, the average material than the X-band electromagnetic shielding effectiveness of 6.4dB / (g/cm3).
The researchers noted that the polymer micro-foaming process, will increase the volume of material, absorbent volume will be reduced. This would directly harm the foam polymer micro electromagnetic shielding / performance absorbing materials. To solve these problems, researchers at the graphene surface in situ synthesis of iron oxide nano Third, the use of the electromagnetic matching composite nanomaterial more excellent electromagnetic shielding performance polyimide foam micro electromagnetic shielding materials were successfully prepared, electromagnetic shielding effectiveness ratio increased from 36.4 dB / (g/cm3) to 41.5 dB / (g/cm3).
Electromagnetic properties matching characteristics of composite nanomaterial make polymer micro foam can absorb rather than reflect more of electromagnetic waves, which undoubtedly reduces the electromagnetic environment of secondary pollution. Future, electronic products will become smaller and smaller dimensions, integrated electronic devices will be increasingly high, which will require electronic shielding / absorbing materials in the "quality of light, thin, wide-band absorption strong" direction development.
Polymer micro-foam film and sheet can be a high-performance, or flexible polyurethane resin. Materials can be used for radar wave-transparent materials, mobile electronic payments absorbing material, absorbing patch, stealth materials, structure and function integration in many fields of new materials.
- 2023 Chinese Electromagnetic Shielding Protective Clothing (radiation suit radiation maternity dress) Physical Store Quality Sampling Assessment(05/02/2023)
Recently, for the suit of electromagnetic radiation of Chinese mainland (known locally as radiation suits, or radiation maternity), ESMMC conducted a field shop unannounced visits, sampling activities. ESMMC sampled the product storage, and entrusted with maintaining long-term relationships globally recognized laboratories for product quality assessment. This is results of the evaluation.
- Chinese domestic civil electromagnetic radiation protective clothing brands comprehensive evaluation(06/02/2020)
Evaluation results are translated into scores (PETS), each critical point to 20pets out, the following are survey results, press out successively in the order presented
- 2019 Report on Functional Comparison Test of Radiation-proof Clothes for Pregnant Women(27/02/2019)
he rise of technology allows us to enjoy unexpected life experience. However, electromagnetic radiation brought by various electronic and electrical products has become a new concern. According to the ESMMC survey, more than 90% of women will purchase radiation-proof clothes when preparing themselves for pregnancy in response to the increasingly complex environment exposed to electromagnetic radiation.
- Scientific Radiation Protection, Care for the Future, ESMMC Comparative Test Report on Radiation Protection Maternity Wear and Top Ten Radiation Protection Wear(01/08/2018)
Radiation protection maternity wear of unique materials and reasonable design can adapt to physiological changes of pregnant women and shield them from radiation, thus gaining great attention among pregnant women. Brands of radiation protection clothing such as U+ (Youjia) and JOYNCLEON have become the hot topic of conversations among expectant mothers.
- Questionnaire survey on the consumers' experience of radiation maternity dress in 2016(18/03/2016)
The questionnaire aims to the pregnant women in 71 hospitals from Beijing, Shanghai, Guangzhou and other cities. A total of 6000 questionnaires were distributed including 3652 questionnaires acquired and 3541 effective questionnaire
- ESMMC announce:Asia Pacific Civil electromagnetic shielding clothing sampling assessment( 2014)(08/01/2015)
- Taiwan Electromagnetic Radiation Environmental Protection Association, said: long-term exposure to 3-4 milligauss, 2-fold increase in childhood leukemia(05/04/2014)
- Chinese Said: Electromagnetic Radiation Can Harm To the Face(03/04/2014)
- ISMB Develops the Automotive Intelligent Integrated Solutions(30/03/2014)
- Uncover MAS MH370 "Lost Contact" Truth Only Hope: Black Box(08/03/2014)
©ESMMC 2013 ESMMC including ESMMC Asia，ESMMC Europe，ESMMC America，ESMMC Africa，ESMMC Oceania.