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18 record(s) found

Interaction Between Langmuir Films Of Calix[4]Arenes With Aqueous Lead Ions

Azahari Noor Azyyati, Supian Faridah Lisa, Malik Syed Abdul,

Abstract

Calixarenes is widely used as a sensor material due to nanoporous film structure. We used a type of calix[4]arenes to observe the suitability of calixarenes paired with Pb2+ ions. Langmuir Blodgett technique was used to observe the surface pressure-area (Π-A) isotherm, surface potential-area (ΔV-A) isotherm and effective dipole moment (μ⊥) characteristic of the calixarenes due to the binding interaction. The radius of Calixarenes‘ cavity was determined from its isotherm and we found that the cavity‘s radius is inversely proportional to spreading volume. When the PbCl2 salt is introduced into the subphase, the Pb2+ions begin to interact with Mat 3 until stabilization is achieved indicating the greatest number of ions that can bind with Mat 3 has been reached. Hence, ion sensing of Pb2+ ions using Mat 3 can be achieved over the range of 0 - 6.50×10−2-2 mM..

Conference Item Published 2012 3247 hits Available

Copolysiloxane solvent detector using langmuir-blodgett surface potential method

Supian Faridah Lisa, Yahaya Rozita, Lim D.C.K.,

Article Published 2017 1831 hits Limited

Conductivity comparison of Calix[8]arene-MWCNTs through spin coating technique

Supian Faridah Lisa, Kheng Darvina Lim Choo, Razal Amira Shakila,

Article Published 2017 1874 hits Limited

Surface potential and temperature effect studies of homo- and copolysiloxanes through Langmuir Blodgett technique

Faridah Lisa Supian

Abstract

Hydrophilic backbone chains with substituted hydrophobic organic groups give rise to amphiphilic polysiloxane. This property is of great interest as it can form a Langmuir monolayer, an orderly arranged layer that can be utilised in any potential nanoscale application. Hence, a study was conducted on the surface pressure, surface potential and effective dipole moment of various homopolysiloxane and copolysiloxane Langmuir films to clarify some of their monolayer properties. A NIMA Langmuir 611D trough accompanied with a NIMA surface potential (S-POT) probe was employed in this work. The space filling model, generally known as the Corey, Pauling and Koltun (CPK) precision molecular model, was used to construct the siloxanes unit of each set of polysiloxanes to estimate the siloxane unit size. From the surface pressure isotherm, it was observed that copolysiloxanes are more condensed than homopolysiloxanes. By comparing the results extrapolated from the graph with CPK modelling, the stru.....

Article Published 2019 2016 hits Available

Development and evaluation of solar energy project module for pre-university programme level and its impact on students.

Faridah Lisa Supian

Abstract

The main objectives of this research is to design and develop the Solar Energy project module entitled SESTEM. In this 34 pages module, technologies were embedded which there are QRCodes and links of videos that were mainly made for this module by the research assistant. This research is design based on ADDIE model (analyse, design, development, implementation and evaluation. Firstly, we analyse the requirements and criteria for developing the hands-on activity related to solar project. Next, designing the hands-on STEM-based and in the same time develop the module consist of several projects. Furthermore, we developed a set of questionaire survey using the Technology Acceptance Model (TAM) method in order to evaluate the students’ perception of the complete Solar Energy STEM module...

Research Report Published 2018 1492 hits Available

Correlation of langmuir isotherm, optical, surface potential and morphological characterizations of two functionalized dihydroxycalix [4] arene for lead cation entrapment

Faridah Lisa Supian

Abstract

The versatilities of calixarenes have been known primarily in the host-guest world. In this work, two calix[4]arenes, namely C-DHC4 and N-DHC4, possess the same lower rim but are distinct in the upper rim. The Langmuir Isotherm and optical properties have been carried out using Langmuir?Blodgett trough and UV-Visible spectroscopy, respectively. The topographical image of the calix[4]arenes has been observed using FESEM, and lead cation entrapments of these calix[4]arenes have been inspected using the surface potential sensor. The isotherm graph revealed the size of each calixarene; C-DHC4 ~ 1.90 nm2 and N-DHC4 ~ 2.10 nm2 . The UV-Visible result demonstrated that each calix[4]arene has two firm absorption peaks where C-DHC4 has two broad peaks, which lie in 261 and 330 nm, while N-DHC4 has two shoulders at 275 and 282 nm. FESEM images have shown the formation of calix[4]arene nanocluster. Further monitoring on the surface potential and effective dipole moment indicate that C-DHC4 perfor.....

Article Published 2021 1769 hits Available

The effects of taste sensitivity and repeated taste exposure on children’s intake and liking of turnip (Brassica rapa subsp. rapa): a bitter Brassica vegetable

Lisa Methven

Abstract

Low consumption of vegetables in children is a concern around the world, hence approaches aimed at increasing intake are highly relevant. Previous studies have shown that repeated taste exposure is an effective strategy to increase vegetable acceptance. However, few studies have examined the effect of repeated taste exposure on children varying in bitter taste sensitivity. This study investigated the influence of taste genotypes and phenotypes on the effects of repeated taste exposure to a Brassica vegetable. 172 preschool children aged 3?5 years were recruited into this study. Turnip was selected as the target vegetable and parents completed a questionnaire to ensure unfamiliarity. During the intervention, children were exposed to steamed-pureed turnip for 10 days (once/day). Intake and liking were measured before, during and after the intervention, and a follow-up was done 3 months post-intervention. Taste genotypes (TAS2R38 and gustin (CA6) genotypes) and taste phenotypes (PROP tast.....

Article Published 2021 1301 hits Available

Instrument of understanding level test of newtons law concept: case study flying fox ride in Bukik Chinangkiek Edupark, West Sumatera, Indonesia

Lisa, Tessa Destia Putri

Abstract

Misconception is a misinterpretation of a concept that incompatible with scientists conception. Misconception can be caused by experiences when interacting with natural environment. One of physics concept that is often encountered in everyday life and still a misconception for students is Newton's law concept. Natural learning can help students understand scientific concepts. Using surrounding environment in learning is to make it a learning resource or known as educational park. Physics e-book of Bukik Chinangkiek Edupark, describes the application of Newton's law concept on flying fox rides very well. But, this book only contains an evaluation of student’s knowledge, not accompanied by an evaluation to find out the understanding level of student’s concept. The evaluation of student’s concept understanding is necessary to detect and distinguish the understanding level of student’s concepts, between understand the concept, understand the concept but not sure, misconceptions, an.....

Article Published 2021 1095 hits Available

The evaluation of a technology-embedded solar energy stem (Sestem) module: A pilot implementation of modern teaching tool for diploma science students

Faridah Lisa Supian

Abstract

Utilising an excellent teaching tool is vital for students education nowadays. In contrast to the traditional teaching way, Technology-Embedded Solar Energy STEM (SESTEM) module was created as a modern teaching tool for physics subject. In order to develop and evaluate the students perception towards the complete SESTEM module, developmental research and technology acceptance model (TAM) were applied in this research study. 52 randomly selected diploma students from Sultan Idris Education University (UPSI) were involved as respondents in this work. After the development of the SESTEM module using the analysis, design, development, implementation and evaluation (ADDIE) model, the perceptions of students as respondents towards this module were evaluated based on the TAM via questionnaire. Based on the responses from the respondents, the majority of the respondents demonstrated positive attitudes and behaviour intention, as well as agreed that the SESTEM module was useful as a teaching to.....

Article Published 2023 688 hits Available

Cigarette filter butts-derived activated carbon with free binder electrode design for solid-state supercapacitor application

Faridah Lisa Supian

Abstract

The aim of this research is to formulate activated carbon monolith from hazardous waste of cigarette filter butts (CFB) for electrode material monolith design in solid-state supercapacitor application. Potassium hydroxide (KOH) was selected for activation. The ratio of CFB to KOH varied in terms of weight between 1:2 and 1:4, thereby obtaining activated cigarette filter carbon (ACFC). The carbon that has been obtained is designed to be solidly in the form of an additive-free monolith. Monolith-activated carbon is physically characterized to examine thermal decomposition profiles (pre-carbonized), structure, composition, morphology, surface area adsorption, and electrochemical measurements. The optimum precursor was marked with high wettability with self-O-doped of 5.44%.in carbon content of 94.56%. Activated carbon electrodes prepared from ACFCs showed an optimum specific capacitance of ~87.17 F g-1, which is a more ecologically responsible method of producing supercapacitors. 2023 The.....

Article Published 2023 610 hits Available

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