Microchannels fabrication by alginate fiber molding method

Recently, with the increase in awareness about a clean environment worldwide, fuel efficiency standards are being strengthened in accordance with exhaust gas regulations. In the automotive industry, various studies are ongoing on vehicle body weight reduction to improve fuel efficiency. This study aims to reduce vehicle weight by replacing the existing steel reinforcements in an automobile center pillar with a composite reinforcement. Composite materials are suitable for weight reduction because of their higher specific strength and stiffness compared to existing steel materials; however, one of the disadvantages is their high material cost. Therefore, a hybrid molding method that simultaneously performs compression and injection was proposed to reduce both process time and production cost. To replace existing steel reinforcements with composite materials, various reinforcement shapes were designed using a carbon fiber-reinforced plastic patch and glass fiber-reinforced plastic ribs. Structural analyses confirmed that, using these composite reinforcements, the same or a higher specific stiffness was achieved compared to the that of an existing center pillar using steel reinforcements. The composite reinforcements resulted in a 67.37% weight reduction compared to the steel reinforcements. In addition, a hybrid mold was designed and manufactured to implement the hybrid process.

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3D Thermal Network Supported by CF Felt for Improving the Thermal Performance of CF/C/Epoxy Composites

Polymers ◽

10.3390/polym13060980 ◽

2021 ◽

Vol 13 (6) ◽

pp. 980

Author(s):

Xinfeng Wu ◽

Yuan Gao ◽

Tao Jiang ◽

Lingyu Zheng ◽

Ying Wang ◽

...

Keyword(s):

Thermal Conductivity ◽

Electronic Devices ◽

Epoxy Composites ◽

Operating Efficiency ◽

Impregnation Method ◽

Molding Method ◽

Needle Punching ◽

3D Network ◽

Network Method ◽

Process Method

The heat generated by a high-power device will seriously affect the operating efficiency and service life of electronic devices, which greatly limits the development of the microelectronic industry. Carbon fiber (CF) materials with excellent thermal conductivity have been favored by scientific researchers. In this paper, CF/carbon felt (CF/C felt) was fabricated by CF and phenolic resin using the “airflow network method”, “needle-punching method” and “graphitization process method”. Then, the CF/C/Epoxy composites (CF/C/EP) were prepared by the CF/C felt and epoxy resin using the “liquid phase impregnation method” and “compression molding method”. The results show that the CF/C felt has a 3D network structure, which is very conducive to improving the thermal conductivity of the CF/C/EP composite. The thermal conductivity of the CF/C/EP composite reaches 3.39 W/mK with 31.2 wt% CF/C, which is about 17 times of that of pure epoxy.

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A nanograting-based flexible and stretchable waveguide for tactile sensing

Nanoscale Research Letters ◽

10.1186/s11671-021-03488-0 ◽

2021 ◽

Vol 16 (1) ◽

Author(s):

Wang Peng ◽

Qingxi Liao ◽

Han Song

Keyword(s):

Optical Waveguide ◽

Optical Materials ◽

Mechanical Deformation ◽

Waveguide Structure ◽

Tactile Sensing ◽

Force Detection ◽

Detection Range ◽

Molding Method ◽

Light Loss ◽

External Force Detection

AbstractBased on the related characteristics of optical waveguide and flexible optical materials, a flexible and stretchable optical waveguide structure oriented to tactile perception is proposed. The sensing principle of optical waveguide is based on mechanical deformation caused by output light loss. It overcomes the shortcomings of traditional optical waveguide devices, which are unable to conform to irregular surface. The flexible and stretchable optical waveguide is fabricated with nanoreplica molding method, and it has been applied to the measurement of pressure and strain in the field of tactile sensing. The flexible and stretchable optical waveguide had a strain detection range of 0 to 12.5%, and the external force detection range is from 0 to 23 × 10–3 N.

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Manufacture of Contact Lens of Nanoparticle-Doped Polymer Complemented with ZEMAX

Nanomaterials ◽

10.3390/nano10102028 ◽

2020 ◽

Vol 10 (10) ◽

pp. 2028

Author(s):

Lina M. Shaker ◽

Ahmed A. Al-Amiery ◽

Abdul Amir H. Kadhum ◽

Mohd S. Takriff

Keyword(s):

Contact Lenses ◽

Titanium Dioxide Nanoparticles ◽

Optical Design ◽

Sol Gel ◽

High Refractive Index ◽

Light Transmittance ◽

Great Promise ◽

Modulation Transfer ◽

Tio2 Nps ◽

Molding Method

Many people suffer from myopia or hyperopia due to the refractive errors of the cornea all over the world. The use of high refractive index (RI), Abbe number (νd), and visible light transmittance (T%) polymeric contact lenses (CLs) holds great promise in vision error treatment as an alternative solution to the irreversible laser-assisted in situ keratomileusis (LASIK) surgery. Titanium dioxide nanoparticles (TiO2 NPs) have been suggested as a good candidate to rise the RI and maintain high transparency of a poly(methyl methacrylate) (PMMA)-TiO2 nanocomposite. This work includes a preparation of TiO2 NPs using the sol gel method as well as a synthesis of pure PMMA by free radical polarization and PMMA-TiO2 CLs using a cast molding method of 0.005 and 0.01 w/v concentrations and a study of their effect on the aberrated human eye. ZEMAX optical design software was used for eye modeling based on the Liou and Brennan eye model and then the pure and doped CLs were applied. Ocular performance was evaluated by modulation transfer function (MTF), spot diagram, and image simulation. The used criteria show that the best vision correction was obtained by the CL of higher doping content (p < 0.0001) and that the generated spherical and chromatic aberrations in the eye had been reduced.

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Optimization of clay properties for selecting brick molding method

Glass and Ceramics ◽

10.1007/s10717-005-0007-3 ◽

2004 ◽

Vol 61 (11-12) ◽

pp. 379-381 ◽

Cited By ~ 1

Author(s):

V. P. Rat’kova ◽

N. D. Yatsenko ◽

G. N. Ivanyuta ◽

P. B. Nechaev

Keyword(s):

Molding Method

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Precision Grinding of Structured Tungsten Carbide Mold

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.497.15 ◽

2012 ◽

Vol 497 ◽

pp. 15-19 ◽

Cited By ~ 2

Author(s):

Hirofumi Suzuki ◽

Tatsuya Furuki ◽

Mutsumi Okada ◽

Yutaka Yamagata ◽

Shinya MORITA

Keyword(s):

Tungsten Carbide ◽

Power Efficiency ◽

Fresnel Lens ◽

Rare Metal ◽

Diamond Wheel ◽

Precision Grinding ◽

Form Accuracy ◽

Molding Method ◽

Grinding Method ◽

Glass Lens

Demands of glass Fresnel lens is increasing in solar panel in order to increase power efficiency. Glass lens is usually molded by glass molding method with tungsten carbide molds. In this study, large Fresnel lens molds made of tungsten carbide are tested to be ground by simultaneous 2-axis (Y, Z) controlled grinding method. The resinoid bonded diamond wheel was trued with a rare metal truer to improve the sharpness of the wheel edge. In the grinding test of the tungsten carbide mold, a form accuracy of less than 0.8 μm P-V and surface roughness of 18 nm Rz were obtained, and it is clarified that the proposed grinding method is useful for the Fresnel grinding.

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A Perspective on Imiquimod Microneedles for Treating Warts

Pharmaceutics ◽

10.3390/pharmaceutics13050607 ◽

2021 ◽

Vol 13 (5) ◽

pp. 607

Author(s):

Tsu-Man Chiu ◽

Ping-Chun Hsu ◽

Mohd Yaqub Khan ◽

Cheng-An J. Lin ◽

Chun-Hung Lee ◽

...

Keyword(s):

Skin Permeability ◽

Tissue Destruction ◽

Imiquimod Cream ◽

Cellular Division ◽

Synthetic Compound ◽

Raw 264.7 Macrophages ◽

Molding Method ◽

Dissolving Microneedles ◽

The Status ◽

Common Skin

Warts are a common skin problem and are caused by infection with a virus. Warts are currently mainly treated by therapies involving ablating tissue or interrupting cellular division. However, all these existing treatments are either invasive or cause skin pain and tissue destruction. Imiquimod is a synthetic compound that belongs to the imidazoquinolinone family. It has been successfully used as a topical drug to treat external anogenital warts. However, topical imiquimod cream for warts is restricted by low skin permeability, and several side effects such as itching, pain, and erosions occur most frequently following topical treatment. Microneedle technology, a minimally invasive drug delivery system, has the potential to overcome the barrier of the stratum corneum. This technique would also offer a painless treatment choice and provide personalized therapies. In the study, we loaded imiquimod within dissolving microneedles using the molding method. Gelatin was used as a structural material for microneedle formation without adding a crosslinker. To our knowledge, this is the first study of using dissolving microneedles and exploring their utilization with imiquimod for the treatment of warts. First, we added fluorescent dye and trypan blue into the microneedles to evaluate the status of drugs in the microneedles and the degradation property of microneedles made of gelatin, respectively. Here we also prove the strength of the imiquimod microneedles and study their capability to penetrate the skin. The results show no apparent differences in mechanical failure after an additional imiquimod-loaded. Besides, we provide evidence that imiquimod microneedles induce secreted embryonic alkaline phosphatase (SEAP) in the RAW 264.7 macrophages. Gelatin does not affect the imiquimod in microneedles; a similar immune response was affected by the imiquimod alone or imiquimod complexed with gelatin. Our research demonstrates a proof of concept of using imiquimod microneedles for future warts treatment.

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Development of ultraprecise injection molding method for thermoplasticlenses

10.1117/12.132109 ◽

1992 ◽

Cited By ~ 1

Author(s):

Akiro Fukushima ◽

Motoaki Kawazu ◽

Hidenori Ito ◽

Hisaaki Koseko ◽

Toshiharu Hatakeyama ◽

...

Keyword(s):

Injection Molding ◽

Molding Method

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Experimental Study on Impact of Production Process Parameters on Rubber Asphalt Performance

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.204-208.3629 ◽

2012 ◽

Vol 204-208 ◽

pp. 3629-3633 ◽

Cited By ~ 1

Author(s):

Wei Hou

Keyword(s):

Production Process ◽

High Speed ◽

Mixing Time ◽

Rubber Powder ◽

The Road ◽

Molding Method ◽

Production Temperature ◽

Mixing Method ◽

Asphalt Performance ◽

Powder Content

In order to better master the production process and the road performance of rubber asphalt, the paper studied the influence law of mixing method, mixing temperature, mixing time and rubber powder content on the performance of rubber asphalt. The results show that all the indexes except the viscosity of rubber asphalt has little change with different mixing methods, and the rubber asphalt has the best performance under the high-speed stirring molding method but the worst performance under the high-speed shearing molding method. Meanwhile, the performance of rubber asphalt change visibly with different mixing temperatures, on which the excessively high or low production temperature has negative significance, so the optimal production temperature would be recommended as 180~200°C. Furthermore, the mixing time and the rubber powder content are the two critical factors which may greatly affect the performance of rubber asphalt, followed by the mixing temperature and the mixing method.

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