Fabrication of Miniaturized Variable-focus Lens Using Liquid Filling Technique

This paper describes a simple method for fabricating a variable-focus lens by using PDMS (polydimethylsiloxane) and filling with liquid for the variable-focus lens. The lens diameter of 2-mm was designed in this experiment and expected to reach the focal length in the range of 3 ~ 12 mm. The theoretical value between the liquid volume and the lens contact angle at different focal lengths were simulated and measured. The pumped-in volumes ranged from 200 to 1400 $\mu$l, the contact angles ranged from 14.25 degrees to 49.02 degrees. Changing the deformation of PDMS film using different micro-fluidic volume produces the variable focal length from 4 10 mm in this experiment. The proposed method successfully fabricated a variable-focus lens. Bonding PDMS only once using no expensive instrument such as oxygen plasma was accomplished. The final objective is to insert the variable focus lens into portable optical imagery products.Comment: Submitted on behalf of EDA Publishing Association (http://irevues.inist.fr/EDA-Publishing

Development and realization of a single-mode optical fiber ferrule mold insert with twelve channels

A manufacturing process for an optical fiber ferrule mold insert with twelve channels has been established. This research project presents mask design, mask fabrication, deep X-ray lithography exposure, resist developing, nickel electroforming, as well as surface finishing to attain the final result. Deep X-ray mask fabrication methods are explored, including mechanically machined masks, micro-EDM masks, and E-beam written masks. The exposures to pattern resists and electroforming to fabricate nickel molds up to 500 $\mu$m thickness are reported in this study. Nickel structures for the optical fiber ferrule insert with twelve channels made by electroforming are the final products. A practical method to finish the microstructure surface is presented. Channels with precision $-$0.0/+0.5 micron and pitch alignment with 0.25 micron are accomplished to satisfy the requirements of the research sponsor for inserting standard optical fibers (125 $\mu$m in diameter)

Miniaturized fluorescence excitation platform with optical fiber for bio-detection chips

This paper presents a new research study on the platform fabrication of fluorescence bio-detection chip with an optical fiber transmission. Anisotropic wet etching on (100) silicon wafers to fabrication V-groove for optical fiber alignment and micro-mirror were included. Combing with anodic bonding technique to adhere glass, silicon structure and optical fiber for a fluorescence excitation platform was completed. In this study, the etching solution 40% KOH was used to study the parameters effect. The results show that working temperature is the main parameter to significantly effect the etch rate. The anisotropic etching resulted 54.7° reflective mirrors and its reflectivity for optical beam were also examined. The surface roughness of the micro-mirror is Ra 4.1 nm measured using AFM, it provides excellent optical reflection. The incident light and beam profiles were also examined for further study. This study can show this micro-platform adaptable for fluorescence bio-detection

Improvement of thickness uniformity in nickel electroforming for the LIGA process

[[abstract]]An effective method to improve thickness uniformity in nickel electroforming for the LIGA process to produce metallic microstructures is described. The deposited metal distribution is naturally a concave shape over the whole area of the plating base proved by experiments. The edge thickness of the plating area is usually twice or higher than the center of the plating area. A secondary cathode (guard ring) was applied to improve the electroform uniformity. The experimental result of a Joule–Thomson micro-cooler proved its feasibility. The thickness ratio of edge to center of a 500 μm sample decreased from 2.5 to 1.4. The thickness uniformity improvement is achieved without a loss in plating rate in the center of the features.[[notice]]補正完畢[[incitationindex]]SCI[[incitationindex]]E

CARBON FIBER ELECTRIC CONDUCTING SHEET AND ITS MANUFACTURING METHOD

本發明係有關一種碳纖維導電片體及其製法,其配合一.梳棉步驟、二.水刺處理步驟、三.含浸步驟、四.熱壓步驟、五.燙平步驟、六.壓光步驟、七.第一道碳化處理步驟,以及八.第二道碳化處理步驟,而製作出一碳纖維導電片體,其概呈可撓之薄片狀,並由複數條纖維組成,經水刺處理使複數條水平排列之纖維與相鄰之纖維產生局部垂直糾結之可撓性之碳纖維導電片體。如此兼具水刺加壓後之纖維疏密分佈較均勻、水刺加壓不易破壞纖維材料、可製出厚度介於15���m至250���m之碳纖維導電片體、以及產品之穿透導電性佳等優點及功效

Carbon Black and Multi-Walled Carbon Nanotube Supported Cobalt for Anion Exchange Membrane Fuel Cell

Carbon black (CB) and multi-wall carbon nanotube (MWCNTs) supported cobalt, namely, CoPc/CB and CoPc/MWCNTs, respectively, with different metal loads was synthesized and used as the cathode catalyst for anion exchange membrane fuel cells. The prepared catalysts were characterized using X-ray diffraction and scanning electron microscopy. The surface morphology analysis revealed heterogeneous cobalt distribution on the carbon support. Cyclic Voltammetry was also studied to investigate the best combination ratio. The results indicated that the electrochemically largest active surface area was observed when 30 and 40 wt% cobalt was combined with 70 wt% CB and 60 wt% MWCNTs, respectively. The anion exchange membrane fuel cell performance showed that both cathode catalysts exhibited the highest peak power density at 40 wt%t. Co load. The peak power density of 55 mW/cm2 at 0.4 volts was obtained using CoPc/CB. Meanwhile, the promising catalyst CoPc/MWCNTs only produced 35mW/cm2, which did not meet the expectation. According to some references, the alkaline fuel cell performance might be bothered by the acid residues, sulfates and nitrates produced by the MWCNT purification process