Papers by Keyword: High Throughput

Abstract: The reduction of the growth pressure was demonstrated to have the same effect as the addition of chloride-containing gas on preventing the Si nucleation and the epitaxy with high growth rate (>50 μm/h) was achieved by using the decreasing pressure condition in a horizontal CVD reactor without chloride-containing gas. The quality of a 30-μm-thick epilayer grown with 40 μm/h was also investigated. Downfall and triangle defect density in the layer was as low as 0.16 /cm², indicating that a high quality epitaxial wafer can be easily obtained under the condition with high throughput in the sinple CVD system.

Abstract: Jet repulsion is the most difficult issue in the multineedle electrospinning process. This study aims at reducing the jet pulsion by designing the spinneret. Three different multijet electrospinning configutations are used to study the jet repulsion in multijet electrospinning process. The experimental results shows that adding a PTFE cylinder to the traditional multineedle electrospinning setup can reduce the jet repulsion, but the diameter and irregularity of the resultant fiber other increased. A needleless electrospinning setup using a multihole plate to replace the needles can reduce jet repulsion effectively, reduce fiber diameter and irregularity as well. And the electric fields of the three electrospinning configurations are simulated by finite element method to explain the experiment results.

Abstract: To meet a high production requirement and high quality of nanofiber, a new disgned multihole spinneret with equilateral hexagon hole array of is used in this paper. We study the effects of two structural parameters of the multihole system on fiber diameter and fiber mats. 3D electric fields were simulated to understand the effects of electric field distribution on electrospinning performance. This study shows that fine and uniform fibers, as well as concentrated and uniform fiber mat can be obtained by this multihole electrospinning system at a high production rate.

Abstract: A high throughput combinatorial robot RAMSI (Rapid Automated Materials Synthesis Instrument) has been developed for nanoceramics synthesis. It can rapidly produce nanoparticle libraries that can be used for new materials discovery. The RAMSI robot has 3 motor-driven axes moving in X-Y-Z space and linking the synthesis, cleanup and printing sections. A High Throughput Continuous Hydrothermal (HiTCH) flow synthesis reactor is contained within RAMSI, and reaches significant production capability of 48 tubes of 50mL samples in 8 hours. Supported by the high throughput hardware design, the control system adopts parallel operations and multi-task assignments. Key strategies include intelligent supernatant detection, dot printing protocols and robot arm route schedule etc. The commissioning of RAMSI showed its high efficiency by producing samples of yttrium hydroxide doped with europium. In a 6-hour experiment, 8 unique 100mL samples were synthesized then cleaned and printed into 96 dots (100 minutes only for synthesis time). The ceramic dots were heat-treated at different temperatures up to 1200°C and affixed into a well-plate library. The brightest phosphors could be readily identified by illumination under UV light.

Abstract: The highly-collimated, intense X-rays produced by a synchrotron radiation source can be harnessed to build high-resolution powder diffraction instruments with a wide variety of applications. The general advantages of using synchrotron radiation for powder diffraction are discussed and illustrated with reference to the structural characterisation of crystalline materials, atomic PDF analysis, in-situ and high-throughput studies where the structure is evolving between successive scans, and the measurement of residual strain in engineering components.