R. Usop, Z.H.Z Abidin, N.A. Mazni, A.N. Hadi, N.A. Halim, R.M. Taha, M.A. Careem, S.R. Majid and A.K. Arof
This paper aims to study the colour stability of chlorophyll and the effect of copper (II) nitrate – Cu(NO3)2 – as an additive in natural dye coating films after being exposed to…
Abstract
Purpose
This paper aims to study the colour stability of chlorophyll and the effect of copper (II) nitrate – Cu(NO3)2 – as an additive in natural dye coating films after being exposed to ultraviolet-A (UV-A).
Design/methodology/approach
The natural dye was extracted from the leaves of Cassia alata L. using absolute ethanol as the solvent. The extract was divided into two parts and, one of it was added with 3 wt.% Cu(NO3)2 as an additive. The polymer blend of poly(methyl methacrylate) (PMMA) and acrylic polyol was used as the coating binder. Both parts of the dye with and without additive were mixed with the blended polymer in a specific ratio. The resulted mixtures were applied as coating films on glass substrates. The colour stability of the coating films on exposure to UV-A with the time of exposure was observed with Commission internationale de l’éclairage (CIE) L*a*b* colour coordinates. The hidden power by the means of reflectivity and glossiness of the coatings was also studied. Statistical standard deviation (STD) was used to analyse the data.
Findings
The test showed that the coating films containing Cu(NO3)2 had smaller colour differences, (ΔE*) indicating higher colour stability. The analysis on hidden power also showed that the coating film with Cu(NO3)2 was 1.6 times more stable than the film without additive. All the measurements in this study were observed within 35 days of duration.
Research limitations/implications
This paper implies the potential of using natural dye extracted from Cassia alata L. leaves as a stable dye colourant for coating applications.
Practical implications
The coating film developed in this study is suitable for glass substrate applications.
Originality/value
A new method of preparing solvent-based coating film from PMMA–acrylic polyol with chlorophyll colourant is introduced in this study.
Details
Keywords
L. Sulaiman, Z.H.Z. Hazrin, N.I.M. Zakir, N.A. Halim, R.A.A. Rusdi, A.S.A. Khair and H.A. Tajuddin
The effect of using microcrystalline cellulose (MCC) as an additive in coating paint films for non-stick coatings was studied in this work. This paper aims to discuss the benefits…
Abstract
Purpose
The effect of using microcrystalline cellulose (MCC) as an additive in coating paint films for non-stick coatings was studied in this work. This paper aims to discuss the benefits of MCC blended in the coating paint film that consists of poly(methyl methacrylate) (PMMA) and dammar.
Design/methodology/approach
PMMA and dammar mixed at a specific Wt.% ratio with xylene as its solvent. Two sets of mixtures were prepared, where one mixture contained MCC and another, without. The mixtures were applied to metal substrates as coating paint films. The performance of the non-stick coating paint film was observed through the adhesive test between adhesion layers on the coating paint film and also through the cross-hatch test for the adhesion of the non-stick coating paint film to the metal substrate. The results correlate with the surface roughness and glossiness tests.
Findings
The results showed that for the coating paint films, Sample B consisted of 80:20 Wt.% ratio of PMMA-dammar with an addition of 5 Wt.% MCC had an excellent performance as non-stick coating paint films. The MCC formed microparticles on the surface of the coating paint film sample and this causes the coating paint film samples with MCC to develop a rougher surface compared to the coating paint film without MCC. Sample B coating paint film had the highest average surface roughness (Ra) of 383 µm. The cross-hatch test showed the coating paint film with the addition of MCC had stronger adhesiveness on the substrate’s surface thus prevents the coating from peeling off from the surface.
Practical implications
The developed coating paint film in this study would be suitable for outdoor applications to prevent illegal advertisements and stickers.
Originality/value
MCC added to the coating paint film improves the surface performance as a non-stick coating.
Details
Keywords
S.V. Lee, R. Usop, A.N. Hadi, N.A. Mazni, S.R. Majid, A.K. Arof, N.A. Halim and Z.H.Z. Abidin
The purpose of this paper is to observe the thermal and colour stabilities of coating films consisting of natural dye anthocyanin colourant with acid and nitrate salt as…
Abstract
Purpose
The purpose of this paper is to observe the thermal and colour stabilities of coating films consisting of natural dye anthocyanin colourant with acid and nitrate salt as additives.
Design/methodology/approach
The natural dye was extracted from Hibiscus sabdariffa L. (Roselle) by using distilled water as solvent. The extracted dye was mixed with 1 weight per cent hydrochloric acid and 5 weight per cent calcium nitrate to conduct the comparison study. The dye samples were than mixed with poly (vinyl alcohol) (PVA). The mixtures were applied on glass panels to form coating films. The coating films were left to dry for 24 hours. The thermal stability of coating films was investigated by using thermogravimetric analysis (TGA). The amorphousness coating films molecular structures were observed by using x-ray diffraction (XRD). CIE L*a*b* colour coordinate space technique was used to investigate the coating films colour stability against ultraviolet (UV).
Findings
The results show that addition of hydrochloric acid (HCl acid) enhanced thermal stability of PVA-anthocyanin coating and shifted the degradation temperature to higher temperature at 300°C. HCl acid also improved UV stability of the coating system significantly with the reduced ΔE from 26.67 to 16.89. Addition of calcium nitrate (Ca(NO3)2) salt promotes good interaction with PVA-anthocyanin system that caused structural changes, improved thermal stability and increased Tg from 61.5 to 83.1°C.
Research limitations/implications
The potential of using natural dye extracted from plant as renewable material.
Practical implications
The coating films developed in this works are suitable for glass substrate application.
Originality/value
Development of water-based coating from PVA binder with anthocyanin colourant is introduced in this study.
Details
Keywords
S.V. Lee, A.N. Hadi, Z.H.Z. Zainal Abidin, N.A. Mazni, N.A. Halim, R. Usop, H.C. Hassan, S.R. Majid and A.K. Arof
The purpose of this paper is to observe the colour and thermal stability of natural red dye consisting of anthocyanin with addition of different aqueous acids and applied as…
Abstract
Purpose
The purpose of this paper is to observe the colour and thermal stability of natural red dye consisting of anthocyanin with addition of different aqueous acids and applied as coating films.
Design/methodology/approach
The natural red dye was extracted from Hibiscus sabdariffa L. (roselle) flowers and mixed with 1 per cent hydrochloric acid, 5 per cent acetic acid, 5 per cent citric acid and 5 per cent oxalic acid. All the dye samples were exposed to heat and UV-B to observe the colour stability by calculating the half-life and rate of reaction. In coating film application, each of the dye samples was mixed with 25 wt% of poly(vinyl alcohol) (PVA) and applied on to a glass substrate. The coating samples’ colour stability was observed by using CIE L*a*b* colour space coordinates. The coating films’ weight loss stability against temperature was observed by using thermogravimetric analysis.
Findings
Addition of hydrochloric acid enhances the thermal and UV stability of the anthocyanin natural dye. This can be observed from the calculation of the half-life of the dye. The half-life values for the thermal and UV stability studies were 1,155 hours and 210 hours, respectively. In coating films, the sample with addition of acetic acid showed the highest colour stability with colour difference (ΔE*) value 8.95.
Research limitations/implications
The coating films developed in this work are not suitable to be applied on metal substrates due to the presence of water, which can contribute to the corrosion formation.
Practical implications
The coating films developed in this work are suitable for washable coating application. In other words, they are non-permanent coatings applied on a glass substrate.
Originality/value
Development of water-based coatings from PVA binder with anthocyanin colourant is introduced in this study.
Details
Keywords
Saleem ur Rahman, Bang Nguyen-Viet, Yen Thi Hoang Nguyen and Sohail Kamran
M-wallets have emerged as one of the most important financial innovations of the 21st century, enabling users to carry digital cash by securely storing payment methods on their…
Abstract
Purpose
M-wallets have emerged as one of the most important financial innovations of the 21st century, enabling users to carry digital cash by securely storing payment methods on their mobile devices. However, the continued use of m-wallets varies among people for several reasons. This study used the technology continuation theory (TCT), gamification and trust factors to examine the variables affecting consumers' intentions to continue using mobile wallets.
Design/methodology/approach
The SmartPLS partial least squares software was used to analyze data from 431 m-wallet users in Vietnam using the structural equation modeling technique.
Findings
The data revealed that the research model can predict users' intentions to continue using mobile wallets. TCT constructs demonstrated strong exploratory power in explaining consumer satisfaction and attitudes towards m-wallets. Furthermore, the study confirmed the direct effect of the perceived effectiveness of gamification on perceived ease of use and attitude, as well as its indirect effect on consumers' continued use intentions of mobile wallets via attitude. In addition, the trust negatively influenced consumers' intentions to continue using m-wallets.
Practical implications
The findings of this study can help researchers, practitioners and policymakers improve m-wallet design, development and adoption, as well as advance financial technology and define the future of digital payments in terms of consumer attraction, engagement and financial inclusion.
Originality/value
Based on TCT theory, this study enriches m-wallet research by examining two important factors, gamification and trust, and thus provides insights into how to improve consumers’ intentions to continue using m-wallets in developing countries. This study offers timely insights into theory and practice regarding these factors. It therefore paves the way for researchers and practitioners to learn how easy, enjoyable and secure the end-user experience should be to keep users engaged with m-wallets.
Details
Keywords
Z.H.Z. Abidin, K.M. Nasir, S.K.M. Jamari, N. Saidon, S.V. Lee, N.A. Halim and R. Yahya
The purpose of this work is to investigate the correlation characteristics in mechanical, thermal and optical properties of PMMA‐acrylic polyol polymer blends mixed with lawsone…
Abstract
Purpose
The purpose of this work is to investigate the correlation characteristics in mechanical, thermal and optical properties of PMMA‐acrylic polyol polymer blends mixed with lawsone natural dye for coating paint application.
Design/methodology/approach
Natural brownish dye colorant was extracted from Lawsonia Inermis leaves used as a dye colorant in this paint coating system by using ethanol as the solvent. Poly(methyl methacrylate) (PMMA), blended with acrylic polyol was used as the binder system. The ratio of PMMA to acrylic polyol was varied with PMMA dominance. The dye colorant was fixed at 10 wt percent.
Findings
The potential time measurement tests showed that the dye colorant paint system with 10 wt percent of acrylic polyol has the highest coating resistance against electrolyte penetration. The dye colorant paint system with 30 wt percent acrylic polyol performed better in mechanical tests such as cross‐hatch and impact resistance. The dye colorant paint system molecular crosslinks were analysed by using the fourier transform infrared spectroscopy (FTIR) and X‐ray diffraction spectroscopy.
Research limitations/implications
The ratio of lawsone dye colorant in the polymer blends is found limited to 10 percent. Increasing in the percentage of lawsone dye colorant will cause inhomogeneity in coating paint sample.
Originality/value
A new formulation of natural dye colorant paint system with 10 percent wt dye volume concentration of lawsone as pigment was obtained.
Details
Keywords
Ajay Kumar, Piali Haldar and Sharad Chaturvedi
The extensive use of digital payment methods has made financial ecosystems more open and effective. As technology develops, the future of commerce is significantly shaped by…
Abstract
Purpose
The extensive use of digital payment methods has made financial ecosystems more open and effective. As technology develops, the future of commerce is significantly shaped by digital payments and e-wallets. This study aimed to examine the influencing factors on the intention to continue use (ICU) of e-wallets.
Design/methodology/approach
A sample of 246 respondents was employed in the data analysis using Smart-PLS 4. Data were collected from e-wallet users using convenience sampling from India. Online survey was conducted for data collection.
Findings
This study found that consumers’ intention to continue use of e-wallets is positively influenced by perceived usefulness, perceived ease of use and rewards. Also, perceived usefulness (PU) shows a significant partial mediating role between perceived ease of use (PEOU), rewards (RW) and ICU. However, it shows a fully mediating role between perceived enjoyment (PEJ) and intention to continue use (ICU).
Originality/value
E-wallet providers should emphasize to provide easy to use e-wallet applications but with rewards. This study added knowledge to the existing literature focusing on the influence of perceived ease of use and rewards on intention to continue use of e-wallets through perceived usefulness, which was not previously tested empirically.
Details
Keywords
Manuela Pilato, Marco Platania and Hugues Séraphin
This chapter contributes to the overall tourist satisfaction to local economies using sustainable practices. The aim therefore is to analyse to what extent the characteristics of a…
Abstract
This chapter contributes to the overall tourist satisfaction to local economies using sustainable practices. The aim therefore is to analyse to what extent the characteristics of a product and service can bridge the gap between locals and visitors. This chapter is based on secondary data. We find evidence for six themes which are considered to be the most theoretical issue affecting the studies on street food in tourism considered in the analysis.
Results show that street food tourism, as a new paradigm, can be a viable option while thinking the process of sustainable tourism development in emerging destinations. Our findings have clear implications for the fast growing literature on overtourism and related perverse impacts (conceptual contribution) giving also additional options to Destination Marketing Organisations' (DMOs) managers in terms of strategy to combat tourismphobia analysed in the study. Proposals for future research will also be outlined.
Details
Keywords
S.V. Lee, N.A. Halim, A.K. Arof and Z.H.Z. Abidin
The purpose of this paper is to develop a new water‐based coating system composed of poly(vinyl alcohol) and anthocyanin colourant extracted from Hibiscus sabdariffa L. and to…
Abstract
Purpose
The purpose of this paper is to develop a new water‐based coating system composed of poly(vinyl alcohol) and anthocyanin colourant extracted from Hibiscus sabdariffa L. and to characterise the system.
Design/methodology/approach
Anthocyanin from Hibiscus sabdariffa L. (roselle) calyxes was extracted by using distilled water and filtered to remove insoluble particle. Salts introduced into the extract were 5wt percent calcium nitrate, 5wt percent magnesium nitrate, and 5wt percent zinc nitrate. The solution was mixed with poly(vinyl alcohol) in ratio of 3:1. The mixtures were coated on glass substrate and allowed to cure for approximately one day. Colour of the extract systems was determined by CIELab colourimetry. FTIR spectroscopy was conducted on the samples to identify their functional groups and changes upon addition of salt. Thermal stability was assessed by thermogravimetric analysis (TGA). Differential scanning calorimetry (DSC) was employed to measure the glass transition temperature Tg of the samples. XRD was employed to determine the amorphous properties of the coating samples.
Findings
From FTIR spectroscopy, shifting in the OH stretching and CH2 bending bands was attributed to hydrogen bonds formation between PVA and nitrate salt. Shifting in the main decomposition step in samples with addition of nitrate salts in TGA was due to interaction of PVA and nitrate. Increase in glass transition temperature of samples with salts was attributed to the formation of hydrogen bonding. From XRD study, increase in the amorphous properties was due to the incorporation of nitrate salts into PVA coating.
Research limitations/implications
Limitation of implementating poly(vinyl alcohol) as coating is caused by its weak water resistance and hydrophilic properties. This study could bring about research towards incorporation of different natural colourant with different binder materials to form coatings which are environmental‐friendly and low cost.
Practical implications
Mixture of PVA and anthocyanin colourant from roselle for use as coating has been developed. The coating can find usage in various applications such as coloured coating for furniture and wooden materials for decorative purposes, biodegradable design materials for interior purposes. It can be practically applied on a variety of substrates such as glass and wood.
Originality/value
Development of water‐based coating from PVA binder with anthocyanin colourant is introduced in this study.
Details
Keywords
K.M. Nasir, N.A. Halim, H.A. Tajuddin, A.K. Arof and Z.H.Z. Abidin
The aim of this paper is to describe the preparation and characterisation of poly(methyl methacrylate) (PMMA) (Mw: 996,000) and dammar mixtures to obtain a new series of natural…
Abstract
Purpose
The aim of this paper is to describe the preparation and characterisation of poly(methyl methacrylate) (PMMA) (Mw: 996,000) and dammar mixtures to obtain a new series of natural coating materials for application on mild steel substrates. Dammar is a natural resin extracted from Dipterocarpus Grandiflorus sp., or kruing trees, which grow mainly in the tropical Asia Pacific forest.
Design/methodology/approach
Natural dammar resin was mixed with PMMA at different weight percentages in xylene as a solvent and dammar as dominant component. The mixtures were applied on mild steel Q‐panels to form dry coating films. The coating films were investigated under Attenuated Total Reflection‐Fourier Transforms Infrared (ATR‐FTIR) technique to observe the presence of functional groups from PMMA and dammar. Resistivity of coating films against corrosive agents from electrolytes was measured by using potential time measurement (PTM) technique. ASTM D3359 (cross‐hatch) technique was used to measure the coating film adhesion strength on the substrate. The entire tests were conducted at 28°C.
Findings
Natural dammar resins is potentially applicable for coating on cold rolled mild steel Q‐panel when mixed with PMMA. Blended dammar resin with PMMA in 5:5 ratio (coded as DP50) was found to give the highest energy of rapid impact indenter. Cross‐hatch test under ASTM D3359 revealed that 50 percent w/w of dammar in PMMA had increased the adhesion strength of the coating film where there was no coating area peeling off from the substrate after the test. DP50 also had the longest time to resist penetration of electrolytes through the coating film when immersed in salt water.
Research limitations/implications
Decreasing the amount of dammar lower than 50 percent weight ratio with PMMA will cause high viscosity and inhomogeneous mixtures.
Originality/value
Natural dammar resin mixed with PMMA (behaviour naturally in free standing film) for coating paint application was formulated.