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Optical trapping and manipulation of a single calix[4] arene microcluster in water

Abstract

This research aimed to optically trap and manipulate a single calix[4]arene microcluster in water. The optically trapped microclusters were evaluated in terms of their optical stiffness and rotatability with respect to the variation of microclusters' effective radius and laser power density. The calixarene microclusters contained solution was prepared by sonicating a vial containing a mixture of 1.7 mg of calix[4]arene powder in 1 ml of deionised water for three minutes. Calix[4]arene microclusters in the effective radius range between 0.5 and 3.5 μm were optically trapped using a 976 nm laser at laser power densities between 0.67 and 2.30 MW/cm2 with laser sport size 1.1 μm. A quadrant photodiode (QPD) collected the scattered light from a single trapped microcluster. The QPD signal was analysed using a custom-made program named OSCal to determine the corner frequency of the optical trap. A quarter waveplate was introduced to the laser path to change the laser polarisatio.....

Thesis Published 2022 1238 hits Available

Social networking sites (SNSs) as a platform to support teaching and learning in scondary schools

Norhayati Mahadi

Abstract

As the world is becoming increasingly borderless with the advent of technology, the academic spaces are increasingly becoming less confined to the four walls of a classroom. Many higher educational institutions abroad have started harnessing the connective power of SNSs to further engage with students outside the classroom. In line with this current trend in education, ideally there should be online platforms which support the teaching and learning of subjects in Malaysian secondary schools. This research is a systematic study of design, development and evaluation processes to establish an empirical basis for the creation of THE EXCHANGE, a prototype of a virtual platform using a SNS, to support the teaching and learning of English in a secondary school. The development of THE EXCHANGE is based on an ISD model, ADDIE. The research also aims to obtain the users' evaluation on the prototype developed in terms of its usability. THE EXCHANGE is evaluated by 46 .....

Thesis Published 2011 60 hits Available

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