The need of mobile microscope is escalating as well as the demand of high quality optical components in low price. We report here a novel needle moving technique to fabricate milli-size lens together with thermal assist moldless method. Our proposed protocol is able to create a high tensile strength structure of the lens and its base which is beneficial for exploiting in convertinga smart phone to be a digital microscope. We observe that no bubble trapped in a lens when this technique is performed which can overcome a challenge problem found in a typical dropping technique. We demonstrate the symmetry, smoothness and micron-scale resolution of the fabricated structure. This proposed technique is promising to serve as high quality control mass production without any expensive equipment required.

Metal halide-based perovskite materials have received great attention in scintillating applications because they can emit strong visible light when interacting with X-ray particles. Here, we report a scintillator based on rubidium copper chlorine incorporated in the polydimethylsiloxane matrix. The scintillator shows a bright violet emission under ultraviolet and ionizing radiation. The temperature-dependent photoluminescence and radioluminescence shows maximum thermal enhancement at 80°C and 60°C, respectively. Moreover, the first X-ray image from this material reveals the detailed information of the object captured by a commercially available digital camera, indicating a potent scintillator for creating X-ray imaging screens.

Bismuth nanostructures are of interest due to unique properties such as strong diamagnetism, high magnetoresistance under magnetic field, as well as biocompatibility compared with lead. Previous study have reported a relationship of obtained nanostructures and synthesized conditions including pH, temperature and time during nucleation. Most of them confront difficulties on size controlling, particularly in large volume synthesis. Therefore, the goal of this work is to simplify the synthesis method by studying an effect of additive chemicals which are introduced to a growth solution before nanocrystal formation. Ascorbic acid, dioctyl sulfosuccinate sodium salt (AOT) and ethanol were chosen to slow down the reaction or disturb the micellar template. The study has shown that size of nanoparticles can be easily tuned by adding different amount of aforementioned chemicals. According to different role in nanocrystal forming mechanism, more ascorbic acid tends to increase diameter of obtained particles. Oppositely, more AOT has shrunk synthesized particles due to packed micelles. Loose micelles are found in ethanol experiment leading to bigger particles in size. In addition, crystalline structure exhibited the diffraction plane at (012), (104), and (110) with X-Ray diffraction (XRD) analysis. Field emission scanning electron microscopy (FE-SEM) was used to determine morphology of nanoparticles, and also size distribution was confirmed by nanoparticle tracking analysis (NTA). We also found the quench of nanocrystal formation in the presence of high concentration of ethyl alcohol.

We report an alloy electrode design for an adaptive liquid lens with a low DC voltage. Due to dielectrophoretic, the focal length of liquid lens can be adapted by applying the electric potential to the electrodes. Herein, the Cr/Cu alloy electrodes in a concentric interdigitate structure with an image aperture of 3 mm were designed and fabricated by a photolithography technique. By using the alloy electrode, the glycerin as the droplet and the commercial silicone oil as the ambient liquid can be applied to form the adaptive liquid lens with a cost-effective. The focal length of designed electrode with the gap of 125 μm and width of 125 μm can be tunable from 14.5 mm to 11.8 mm under the applied voltage range from 0 – 12 volts.