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成果详情 记录 ID:

1000003952236 类别: 期刊论文 标题: 外文标题: Three-dimensional multi-material electromagnetic band-gap structure: design, fabrication and property studies 摘要: 外文摘要: Purpose - The purpose of this paper is to bring up the concept of multi-material electromagnetic band-gap structure (EBGs) and develop a method for its fabrication.

Meanwhile, its microwave properties were studied and compared with the traditional EBGs consisting of two kinds of material. Design/methodology/approach - Stereo lithography (SL) and gel casting were used to fabricate 3D multi-material EBGs. Resin mold was designed and fabricated based on SL process, slurries loaded with 55vol per cent Al2O3 and 55vo1 per cent TiO2, respectively, were prepared, and using gel casting, multilayer EBGs with diamond structure were fabricated. T/R method was used to obtain the characteristic parameter S-21 of the EBGs;

meanwhile, characters of their band structure were studied based on plane wave expansion method. Findings - The fabricated EBGs with a TiO2-resin-air structure showed a band gap from 11.7 GHz to 16.0 GHz along direction;

the EBGs with a TiO2-resin-Al2O3 structure showed a band gap from 11.4 GHz to 11.9 GHz along direction. Both of them agreed well with the simulation result. Also, through the study of multi-material EBGs'

microwave properties, it could be seen that this structure was a good approach to adjust the band gap. Originality/value - With the concept of multi-material EBG structure brought up, multilayer 3D EBGs were designed and fabricated based on SL combined with gel casting. It could be seen that multi-material EBGs was a good approach to adjust the band gap. Also, the fact that the testing result matched the simulation validates the feasibility of the process. 关键词: 外文关键词: Manufacturing systems;

Electromagnetism;

Bandwidths;

Electromagnetic band-gap structure;

Stereolithography;

Gel casting;

Three-dimensional;

Multi-material 作者: *Sun, Kun, Li, Dichen, Wu, Haihua, Wang, Minjie, Tian, Xiaoyong 期刊名称: Rapid Prototyping Journal 状态: 已发表 发表日期:

2012 期号:

3 卷号:

18 起止页码: 222-229 收录情况: SCI 影响因子: 1.0230(2011) 引用次数: 0(2012-11-23 10:56:18) 备注: 最后更新时间: 2012-12-26 08:01:27 成果详情 记录 ID:

1000003952251 类别: 期刊论文 标题: 外文标题: Effective fabrication method of 3D ceramic photonic crystals with diamond structure 摘要: 外文摘要: Purpose - The purpose of this paper is to present a novel and effective fabricating method of 3D ceramic photonic crystals with diamond structure. Design/methodology/approach - The reverse diamond-structure resin molds are fabricated by stereolithography (SL), then ceramic slurry is prepared and injected into the molds under vacuum condition. Subsequently, ceramic photonic crystals are obtained after vacuum freeze-drying and sintering. Findings - The combination of SL, gel-casting and freeze-drying could be used to fabricate the 3D ceramic photonic crystals with diamond structure which have intact structure and minimal shrinkage. The samples have been tested and the experimental results indicate that their band gap is in the range of 10.14-12.20 GHz, consistent with the simulation results. Research limitations/implications - The influence of fabrication process on the photonic band gap needs further study. Originality/value - This paper presents a novel fabricating method of 3D diamond-structure ceramic photonic crystals based on SL, gel-casting and freeze-drying. The method fabricates complex ceramic photonic crystals with high accuracy and helps further research in this field. 关键词: 外文关键词: Crystals;

Ceramics and glass technology;

3D photonic crystals;

Ceramic stereolithography 作者: *Chen, Shibin, Li, Dichen, Tian, Xiaoyong, Wang, Minjie, Dai, Wei 期刊名称: Rapid Prototyping Journal 状态: 已发表 发表日期:

2012 期号:

1 卷号:

18 起止页码: 49-55 收录情况: SCI 影响因子: 1.0230(2011) 引用次数: 0(2012-11-23 10:47:01) 备注: 最后更新时间: 2012-12-26 08:01:32 成果详情 记录 ID:

1000003952261 类别: 期刊论文 标题: 外文标题: Fabrication of diamond-structured multiceramic coupling photonic crystal and its ultra-wide bandgap properties 摘要: 外文摘要: The diamond-structured multiceramic coupling photonic crystal (PC) containing alumina and yttira simultaneously was successfully fabricated by stereolithography and multistep gel-casting process. Compared with the bandgap width of the alumina PC or the yttira PC separately, the bandgap width of the multiceramic coupling PC is 8.5 GHz that became 134.9% of the alumina PC'

s bandgap width and 146.6% of the yttira PC'

s bandgap width along the direction G-X <

100 >

, and the resulting gap-midgap ratio significantly increased too. These results agreed well with the simulation results by finite integration technique. (c)

2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2569-2572, 2012;

View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27134 关键词: 外文关键词: diamond-structured;

multiceramic;

coupling;

photonic crystal;

bandgap 作者: *Liang, Qingxuan, Li, Dichen, Yang, Gai 期刊名称: Microwave and Optical Technology Letters 状态: 已发表 发表日期: 2012/11 期号:

11 卷号:

54 起止页码: 2569-2572 收录情况: SCI 影响因子: 0.6180(2011) 引用次数: 0(2012-11-23 10:45:59) 备注: 最后更新时间: 2012-12-26 08:01:37 成果详情 记录 ID:

1000003952287 类别: 期刊论文 标题: 外文标题: Biocompatibility and biodegradation studies of PCL/beta-TCP bone tissue scaffold fabricated by structural porogen method 摘要: 外文摘要: Three-dimensional printer (3DP) (Z-Corp) is a solid freeform fabrication system capable of generating sub-millimeter physical features required for tissue engineering scaffolds. By using plaster composite materials, 3DP can fabricate a universal porogen which can be injected with a wide range of high melting temperature biomaterials. Here we report results toward the manufacture of either pure polycaprolactone (PCL) or homogeneous composites of 90/10 or 80/20 (w/w) PCL/beta-tricalcium phosphate (beta-TCP) by injection molding into plaster composite porogens fabricated by 3DP. The resolution of printed plaster porogens and produced scaffolds was studied by scanning electron microscopy. Cytotoxicity test on scaffold extracts and biocompatibility test on the scaffolds as a matrix supporting murine osteoblast (7F2) and endothelial hybridoma (EAhy 926) cells growth for up to

4 days showed that the porogens removal process had only negligible effects on cell proliferation. The biodegradation tests of pure PCL and PCL/beta-TCP composites were performed in DMEM with

10 % (v/v) FBS for up to

6 weeks. The PCL/beta-TCP composites show faster degradation rate than that of pure PCL due to the addition of beta-TCP, and the strength of 80/20 PCL/beta-TCP composite is still suitable for human cancellous bone healing support after

6 weeks degradation. Combining precisely controlled porogen fabrication structure, good biocompatibility, and suitable mechanical properties after biodegradation, PCL/beta-TCP scaffolds fabricated by 3DP porogen method provide essential capability for bone tissue engineering. 关键词: 外文关键词: 作者: Lu, Lin, Zhang, Qingwei, Wootton, David, Chiou, Richard, Li, Dichen, Lu, Bingheng, Lelkes, Peter, *Zhou, Jack 期刊名称: Journal of Materials Science: Materials In Medicine 状态: 已发表 发表日期: 2012/9 期号:

9 卷号:

23 起止页码: 2217-2226 收录情况: SCI 影响因子: 2.3160(2011) 引用次数: 0(2012-11-23 10:46:14) 备注: 最后更新时间: 2012-12-26 08:01:53 成果详情 记录 ID:

1000003952305 类别: 期刊论文 标题: 外文标题: Ultra-wide bandgap of gradient dielectric constant photonic crystal 摘要: 外文摘要: A diamond-structured photonic crystal (PC) of gradient dielectric constant realized by combining alumina PC with two different solid loadings of alumina powder in the slurry was fabricated using the stereolithography (SL) and gel-casting process. The ultra-wide bandgap was experimentally confirmed by reflection and transmission measurements and simulated by the Finite Integration Technique (FIT). It was found that, the bandgap width of the PC with gradient dielectric constant increased remarkably in comparison with that of the normal alumina PC and reached

8 GHz, which was 117.6% of that of the alumina PC(60 vol.%). The maximum attenuation attained from the fabricated sample is -63.4 dB. The results indicate that the diamond-structured PC with gradient dielectric constant could effectively expand the bandgap width of the PC. The simulation result agreed well with the measurement result by FIT. (C)

2012 Elsevier B.V. All rights reserved. 关键词: 外文关键词: Electronic materials;

Ceramics;

Diamond-structured;

Photonic crystal;

Gradient dielectric constant 作者: *Liang, Qingxuan, Li, Dichen, Yang, Gai,........