以镀Ni-Cu-La-B玻璃纤维与镍粉为复合填料,以丙烯酸树脂作为粘结剂,研制了一种新型电磁波屏蔽复合材料—镀Ni-Cu-La-B玻璃纤维/镍粉/丙烯酸树脂,在300 k Hz^1.5 GHz频率范围内,其电磁屏蔽性能达到47.777~64.284 d B。最后,介绍了这种新...以镀Ni-Cu-La-B玻璃纤维与镍粉为复合填料,以丙烯酸树脂作为粘结剂,研制了一种新型电磁波屏蔽复合材料—镀Ni-Cu-La-B玻璃纤维/镍粉/丙烯酸树脂,在300 k Hz^1.5 GHz频率范围内,其电磁屏蔽性能达到47.777~64.284 d B。最后,介绍了这种新型电磁波屏蔽复合材料的物理性能指标、主要特点及发展前景。展开更多
主要研究以磁性纤维板作为芯材制备多层复合磁性板材,并对板材的电磁波吸收性能进行研究,为木质复合磁性板材的生产及其在电磁波吸收领域的应用提供理论和试验基础。通过化学原位共沉淀法制备得到磁性纤维,并将其压制成纤维板芯材,再通...主要研究以磁性纤维板作为芯材制备多层复合磁性板材,并对板材的电磁波吸收性能进行研究,为木质复合磁性板材的生产及其在电磁波吸收领域的应用提供理论和试验基础。通过化学原位共沉淀法制备得到磁性纤维,并将其压制成纤维板芯材,再通过热压法与普通单板制备多层板;对所得样品分别进行(XRD)、傅里叶变换红外光谱分析(FT-IR)、振动样品磁强计(VSM)分析和网络矢量分析仪分析。结果表明,不同铁盐浸渍时间对磁性纤维的磁性产生较大差异,其中72 h样品的磁性最强,饱和磁化强度(M_s)达到20.52 emu/g,24 h样品磁性最弱,只有8.04 emu/g。同时,电磁波最大吸收强度对应的电磁波频率以及有效电磁波吸收频率范围均随磁性纤维板芯材厚度的增加而减小。另外,研究还发现,通过调节铁盐浸渍时间,木质复合磁性板材对电磁波吸收的最大值和针对的电磁波频率有效吸收范围均发生了变化,并且电磁波吸收性能随着铁盐浸渍时间的增加而增强,从而达到调节电磁波吸收性能的效果。最后,研究了多层木质复合磁性板材中磁性纤维板芯材的层数对其电磁波吸收性能的影响,结果显示,在其他条件不变的情况下,随着磁性纤维板芯材层数的增加,其电磁波吸收强度由-14.14 d B(3层)增加到-60.16 d B(7层)。展开更多
IZO films were deposited onto PET substrate at room temperature with the inclined opposite target type DC magnetron sputtering equipment,in which a sintered oxide IZO target(doped with 10% ZnO,packing density of 99.99...IZO films were deposited onto PET substrate at room temperature with the inclined opposite target type DC magnetron sputtering equipment,in which a sintered oxide IZO target(doped with 10% ZnO,packing density of 99.99%) was used.The effects of total sputtering pressure and film thickness on IZO films properties were studied.All the films produced at room temperature have a amorphous structure,irrespective of the total sputtering pressure and film thickness.A resistivity of the order of 10-4 Ωcm was obtained for IZO films deposited at lower pressure(film thickness of 190 nm).The resistivity of IZO films deposited at room temperature depends on film thickness and shows a minimum at a thickness of 530 nm.展开更多
With wide applications of electromagnetic instruments and equipments in medical treatment, scientific re- search and national defense, and daily life items of computers, mobile telephones, and microwave ovens etc, ele...With wide applications of electromagnetic instruments and equipments in medical treatment, scientific re- search and national defense, and daily life items of computers, mobile telephones, and microwave ovens etc, elec- tromagnetic radiations have brought us great benefit. However, there are potential damages with electromagnetic radiations,e.g. the electromagnetic pulse (EMP), which is not ionizing radiation but can cause vibration of atoms or molecules and alter electron energy levels. It has been reported that EMP could decrease the learning and recol- lection ability of mice and rats through inducing metabolic disorder of neurotransmitter in mice brain and affect the brain wave of anesthetized rats. EMP also has some effect on immune, procreation and endocrine system of mice. The integrity of the blood-brain barrier (BBB) was detected in order to observe the effects of J005A electro- magnetic wave shielding textile (JEWST) on bio-effects of EMP. 48 BALB/c male mice were randomly divided into exposure groups and JEWST protection groups (n=6). EMP was generated from a bounded-wave simulator and transmitted into a GTEM cell in which the mice were exposed. The field intensity was 0, 100, 200 and 400 kV m-1, respectively. The integrity of the BBB was determined by a quantitative measurement of Evans blue (EB) dye. The quantity of penetrated EB in brains of the mice increased obviously after exposure to 100, 200and 400 kV m-1 EMP, compared with the control groups (p<0.0 1). In JEWST prevention groups, the quantity of penetrated EB was significantly decreased after exposure compared with the exposure groups. EMPs of 100, 200 and 400 kV m-1 could increase the permeability of BBB in mice. The J005A electromagnetic wave shieldlng textile may prevent BBB from EMP induced BBB injury in mice.展开更多
文摘以镀Ni-Cu-La-B玻璃纤维与镍粉为复合填料,以丙烯酸树脂作为粘结剂,研制了一种新型电磁波屏蔽复合材料—镀Ni-Cu-La-B玻璃纤维/镍粉/丙烯酸树脂,在300 k Hz^1.5 GHz频率范围内,其电磁屏蔽性能达到47.777~64.284 d B。最后,介绍了这种新型电磁波屏蔽复合材料的物理性能指标、主要特点及发展前景。
文摘主要研究以磁性纤维板作为芯材制备多层复合磁性板材,并对板材的电磁波吸收性能进行研究,为木质复合磁性板材的生产及其在电磁波吸收领域的应用提供理论和试验基础。通过化学原位共沉淀法制备得到磁性纤维,并将其压制成纤维板芯材,再通过热压法与普通单板制备多层板;对所得样品分别进行(XRD)、傅里叶变换红外光谱分析(FT-IR)、振动样品磁强计(VSM)分析和网络矢量分析仪分析。结果表明,不同铁盐浸渍时间对磁性纤维的磁性产生较大差异,其中72 h样品的磁性最强,饱和磁化强度(M_s)达到20.52 emu/g,24 h样品磁性最弱,只有8.04 emu/g。同时,电磁波最大吸收强度对应的电磁波频率以及有效电磁波吸收频率范围均随磁性纤维板芯材厚度的增加而减小。另外,研究还发现,通过调节铁盐浸渍时间,木质复合磁性板材对电磁波吸收的最大值和针对的电磁波频率有效吸收范围均发生了变化,并且电磁波吸收性能随着铁盐浸渍时间的增加而增强,从而达到调节电磁波吸收性能的效果。最后,研究了多层木质复合磁性板材中磁性纤维板芯材的层数对其电磁波吸收性能的影响,结果显示,在其他条件不变的情况下,随着磁性纤维板芯材层数的增加,其电磁波吸收强度由-14.14 d B(3层)增加到-60.16 d B(7层)。
基金supported by the Ministry of Education,Science Technology (MEST) and Korea Industrial Technology Foundation (KOTEF) through the Human Resource Training Project for Regional Innovation
文摘IZO films were deposited onto PET substrate at room temperature with the inclined opposite target type DC magnetron sputtering equipment,in which a sintered oxide IZO target(doped with 10% ZnO,packing density of 99.99%) was used.The effects of total sputtering pressure and film thickness on IZO films properties were studied.All the films produced at room temperature have a amorphous structure,irrespective of the total sputtering pressure and film thickness.A resistivity of the order of 10-4 Ωcm was obtained for IZO films deposited at lower pressure(film thickness of 190 nm).The resistivity of IZO films deposited at room temperature depends on film thickness and shows a minimum at a thickness of 530 nm.
文摘With wide applications of electromagnetic instruments and equipments in medical treatment, scientific re- search and national defense, and daily life items of computers, mobile telephones, and microwave ovens etc, elec- tromagnetic radiations have brought us great benefit. However, there are potential damages with electromagnetic radiations,e.g. the electromagnetic pulse (EMP), which is not ionizing radiation but can cause vibration of atoms or molecules and alter electron energy levels. It has been reported that EMP could decrease the learning and recol- lection ability of mice and rats through inducing metabolic disorder of neurotransmitter in mice brain and affect the brain wave of anesthetized rats. EMP also has some effect on immune, procreation and endocrine system of mice. The integrity of the blood-brain barrier (BBB) was detected in order to observe the effects of J005A electro- magnetic wave shielding textile (JEWST) on bio-effects of EMP. 48 BALB/c male mice were randomly divided into exposure groups and JEWST protection groups (n=6). EMP was generated from a bounded-wave simulator and transmitted into a GTEM cell in which the mice were exposed. The field intensity was 0, 100, 200 and 400 kV m-1, respectively. The integrity of the BBB was determined by a quantitative measurement of Evans blue (EB) dye. The quantity of penetrated EB in brains of the mice increased obviously after exposure to 100, 200and 400 kV m-1 EMP, compared with the control groups (p<0.0 1). In JEWST prevention groups, the quantity of penetrated EB was significantly decreased after exposure compared with the exposure groups. EMPs of 100, 200 and 400 kV m-1 could increase the permeability of BBB in mice. The J005A electromagnetic wave shieldlng textile may prevent BBB from EMP induced BBB injury in mice.
