Self-cleaning treatment on historical stone surface via titanium dioxide nanocoatings

2019 ◽  
Vol 48 (5) ◽  
pp. 404-408
Author(s):  
Pooneh Kardar ◽  
Reza Amini

Purpose The purpose of this study is to evaluate the possibility of using titanium dioxide coating in the field of architectural heritage. Design/methodology/approach In this research, a titanium dioxide coating was prepared and then applied to the travertine stone surfaces. The nature of the coating was determined through various observations and analyses. Moreover, the effect of photocatalytic self-cleaning was evaluated using an organic dye (Rhodamine B). Findings The results of XRD, DLS and SEM confirmed the formation of small anatase crystals. The hydrophilic behavior on the surface was observed by coatings based on titanium dioxide. Research limitations/implications The self-cleaning ability of titanium dioxide is due to the synergistic effect of its optical inductive property, which is activated with sunlight. Practical implications The self-cleaning coatings are interested for many industries. The reported data can be used by the formulators working in the research and development departments. Social implications Self-cleaning systems are considered as smart coatings. Therefore, the developing of its knowledge can help to extend its usage to different applications. Originality/value The application of titanium dioxide coating in the field of architectural heritage is a great challenge. Therefore, in this research, a titanium dioxide coating was prepared by sol-gel method and then applied on travertine surfaces and its properties were studied.

2016 ◽  
Vol 45 (2) ◽  
pp. 73-78 ◽  
Author(s):  
Pooneh Kardar

Purpose – The purpose of this work was to prepare a catalyst-free microcapsules as self-healing agent in an automotive clearcoat to improve the scratch resistance of coatings. Design/methodology/approach – In this research, microcapsule with isophorone diisocyanate (IDPI) core and polyurethane shell were prepared and used in self-healing coatings. Microcapsules synthesised were characterised by thermal gravimeter and infrared spectra. The microcapsules were dispersed in an acrylic-melamine clearcoat, and the scratch resistance was evaluated. Findings – The triplex product and the formed polyurethane bonds were confirmed by thermal gravimeter and infrared spectra. In addition, smooth spherical particles with a diameter of 1.5 to 1.7 micronmeters were observed by a scanning electron microscope. The microcapsules dispersed in an acrylic-melamine clearcoat increased the scratch resistance of coatings. Also, the self-healing feature of those coatings was proved. Research limitations/implications – The size of microcapsules can affect its dispersion in the clearcoat and consequently affect the properties of the cured films. Practical implications – The self-healing coatings are interested for many industries such as building and automotive industries. The reported data can be used by the formulators working in the R & D departments. Social implications – Self-healing systems are considered as one of the smart coatings. Therefore, the developing of its knowledge can help to extend its usage to different applications. Originality/value – The application of microcapsules in the coating as healing agents is a great challenge, which has been hardly investigated so far. In the current research, the effect of polyurethane-IDPI microcapsules in an automotive clearcoat as a self-healing coating was investigated.


2018 ◽  
Vol 162 ◽  
pp. 05006 ◽  
Author(s):  
Adawiya Haider ◽  
Riyad Al-Anbari ◽  
Ghadah Kadhim ◽  
Zainab Jameel

In the present work, titanium dioxide (TiO2) nanoparticles (NP’s) were prepared using sol-gel process from Titanium Tetrachloride (TiCl4) as a precursor with calcinations at two temperatures (500 and 900) °C. The effect of calcinations temperatures on the structural, optical, morphological and Root Mean Square (roughness) properties were investigated by means of Scanning Electron Microscopy, X-ray Diffraction (XRD), and Atomic Force Microscopy (AFM). Bacterial inactivation was evaluated using TiO2-coated Petri dishes. A thin layer of photocatalytic TiO2 powder was deposited on glass substrate in order to investigate the self-cleaning effect of TiO2 nanoparticles in indoor and outdoor applications. Ultra-hydrophilicity was assessed by measuring the contact angle and it evaluated photolysis properties through the degradation of potassium permanganate (KMnO4) under direct sunlight. XRD analysis indicated that the structure of TiO2 was anatase at 500 °C and rutile at 900 °C calcination temperatures. As the calcination temperature increases, the crystallinity is improved and the crystallite size becomes larger. Coated films of TiO2 made the has permeability, low water contact angle and good optical activity. These are properties essential for the application of the surface of the self-cleaning. The final results illustrate that titanium dioxide can be used in the build materials to produce coated surfaces in order to minimize air pollutants that are placed in microbiologically sensitive circumference like hospitals and the food factory.


2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Fatemeh Narenji Thani ◽  
Ebrahim Mazari ◽  
Somaye Asadi ◽  
Maryam Mashayekhikhi

PurposeConsidering innovation and its improvement as an essential strategy to enable organizations to continue their lives in the new competitive environment leads to a focus on employees' self-development as a factor that affects human resource agility (HRA) and the tendency toward organizational innovation. Consequently, the purpose of the study was to explain the impact of self-development on the tendency toward organizational innovation with the role of the mediator, HRA in higher education institutions as one of the most important and vital organizations in any society.Design/methodology/approachThe study was an applicable one with the quantitative approach using the descriptive–correlative method. The population consisted of 477 nonacademic employees of Kharazmi University among whom 214 ones were selected as the sample group, using a simple random sampling technique. Data were collected through the self-development, HRA and the tendency toward organizational innovation questionnaires and then analyzed using the structural equation modeling approach.FindingsThe study findings revealed a positive impact of self-development on the HRA (γ = 0/79) and HRA on the tendency toward organizational innovation (β = 0/6). Also, self-development with mediating HRA impacts the tendency toward organizational innovation (β = 0/58). Finally, self-development had no direct impact on the tendency toward organizational innovation.Research limitations/implicationsTaking the circumstances of doing this research into consideration, if there were the opportunity to do the research on the staffs of more than one university simultaneously and categorize the university staff into executives, managers and experts, more favorable results could be achieved. Also, considering group and organizational factors with the attention to the self-development approach and its factors would provide more awareness-training information on the higher education system in Iran. For future researches, both the individual and group factors are suggested to be surveyed and compared, to assess the weight and impact of these factors all together and to provide an adequate clarification of the role of the group and the organization. Finally, in future studies, it is also recommended that a qualitative approach be used to reach deeper clarifications on the aspects of these variables in the context of higher education.Practical implicationsThese findings have major practical implications concerning the higher educational settings. The findings of this study must give significant and practical insights for policymakers of universities and other higher education stakeholders, as well as recommendations to the academic community for further research in this area. First, they should recognize that nonacademic staff members are professional employees who contribute to improving organizational innovation. Higher education must focus on designing and implementing successful mechanisms and a well-planned self-development program that can help and promote the self-development approach among all staff. If the above-mentioned programs are designed based on the employees' needs analysis, they will get trained in a way to enhance mental and behavioral flexibility. The programs with such an approach can result in the proactive, adaptive, resilient behavior and agility of HR.Originality/valueThe model for this study has integrated and prioritized the key innovation drivers that would help universities design, adopt and implement policies and practices that facilitate and encourage improvements and adaptation to a fast-paced environment. Furthermore, the convincing reason for the significance of the current research is that although several types of research have been carried out on each of these three variables in different contexts separately, very few studies, like this, have directly examined the correlation between these three variables among the non-academic staff in higher education institutes. So, given the importance of the issue and rare availability of evidence in this regard, the authors were intrigued to discover whether the self-development through the mediation of HRA could reinforce and strengthen the tendency toward organizational innovation and whether HRA could be an appropriate mediator of the relationship between self-development and the tendency toward organizational innovation among the nonacademic staff of Kharazmi University as one of the most prestigious and celebrated universities in Iran.


2014 ◽  
Vol 31 (8) ◽  
pp. 12-14
Author(s):  
Sue Perry

Purpose – The article aims to convey the experiences of installing an Espresso Book Machine (tm) into Windsor Public Library. It relates how an extremely high-tech, mechanical and new process was received in a very traditional field. Design/methodology/approach – Windsor Public Library acquired an Espresso Book Machine, and built around it a Self-Publishing Centre which included iMacs loaded with software, a scanner, a comfortable area and a dedicated staff member. Findings – The creativity that arose from the Self-Publishing Centre was not limited only to individual, solitary authors who wanted just to produce their own works. A network of like-minded people formed to give encouragement and support developed, increasing the opportunities for elevating literacy in our community. Research limitations/implications – Limitations are obviously that we are one small community enjoying the benefits of this machine. It is impossible to predict if other communities and geographic locations would enjoy the same success. Practical implications – Practical implications are that even with the advancing tide of ebooks and non-print matter, patrons are still very eager to consume and produce printed materials. Social implications – The technological marvels of the high-tech gear that have been installed would be lost without the people forming communities around the technology. Originality/value – The results of installing the Self-Publishing Centre were very different from what we anticipated. The products and community established here are as awe-inspiring as the machine at the heart of the Centre.


Crystals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 375
Author(s):  
Andrew I. M. Greer ◽  
David Moodie ◽  
Graham Kerr ◽  
Nikolaj Gadegaard

Self-cleaning windows are well known for their ability to function with airborne pollutants, but there is a growing industry for semi-permanent subaquatic optical devices, where the performance of such windows should be considered. Here sol-gel technology is explored as a means of producing self-cleaning, subaquatic, sapphire windows. We demonstrate removal of marine bacteria and, in the worst-case contamination scenario, dead North Sea crude oil (API 35). This greasy contaminant was smeared across the windows to effectively reduce optical transmission strength to just 54%. The titania-based sol-gel-coated windows can restore transmission to within 10% of the clean value in less than one day, unlike standard sapphire windows, which lose 68% transmission following contamination and aquatic submergence over the same duration. A range of theories to enhance the self-cleaning performance of the sol-gel coating were explored, but none of the tested variables were able to provide any enhancement for subaquatic performance.


2014 ◽  
Vol 18 (2) ◽  
pp. 112-132 ◽  
Author(s):  
Hannele Kauppinen-Räisänen ◽  
Johanna Gummerus ◽  
Catharina von Koskull ◽  
Åke Finne ◽  
Anu Helkkula ◽  
...  

Purpose – Consumers gift themselves with luxury fashion brands, yet the motives for self-gifting are not well understood. Whereas traditionally, self-gifting is defined as self-orientated in nature, luxury brands are seen as social statements, and self-gifting of luxury fashion brands that combine these two controversial areas is an interesting research topic. The purpose of this paper is to address this issue by exploring the self-gifting behaviour of consumers, in particular focusing on the personal motives of gifting oneself with luxury fashion brands. Design/methodology/approach – The study takes a multi-qualitative approach involving a small (n=19) but rich sample. Data collection and analysis were triangulated to reduce researcher biases. Findings – The study provides key dimensions for understanding consumers’ perceptions of luxury fashion brands and self-gifting motives (self and socially orientated). The findings reveal that reflections from others are part of the self-gifting phenomenon. It appeared that although self-orientated benefits and personally orientated motives trigger the self-gifting act, the act of actually purchasing explicitly luxury brands for oneself as a gift may be triggered by other-orientated benefits and socially orientated motives. The findings also imply that luxury holds a self-orientated aspect; luxury brands are not only purchased for socially orientated reasons but also for reasons related to oneself. In addition, the findings discuss the act of shopping, where the act can be perceived as a luxury experience and overrun the importance of the brand. Practical implications – The findings provide insights to consumers’ gifting behaviour that may be valuable for retailers and fashion marketers as they plan for marketing activities related to their customers’ self-gifting. Originality/value – Self-gifting represents a view of gifting that remains under-researched. This study uncovers the motives for gifting oneself with luxury fashion brands, a further sub-area in need for more investigation.


2015 ◽  
Vol 23 (2) ◽  
pp. 106-114 ◽  
Author(s):  
Naomi E. Boyd ◽  
Davide P. Cervone ◽  
Presha E. Neidermeyer ◽  
Adolph Neidermeyer

Purpose – The purpose of this paper is to evaluate the continued adherence to “standing” rules of thumb for the percentage of pre-retirement income which should be available to retirees. Design/methodology/approach – An analysis of census data to determine both the cause and magnitude of the debt load which retirees are carrying into their post-working years. Findings – The “standing” rules of thumb appear to provide less than adequate levels of income for retirees to service their continuing debt load which they have chosen to carry into their retirement years. Research limitations/implications – Census data are subject to the accuracy of “captured information” provided by the surveyed individuals. In this case, the information captured is consistent with generally reported data on the sufficiency of retirement income. Practical implications – Financial planners need to “get the word out early” that individuals need to consider earlier/greater funding of their anticipated retirement income. Social implications – Rising retirees may be “precluded” from retiring as anticipated because of the insufficiency of the replacement income they will have during their retirement years. Originality/value – Detailed census data have not been reviewed in detail with a focus on “individual debt load” as we have performed in this research study.


2019 ◽  
Vol 16 (4) ◽  
pp. 0903
Author(s):  
Suma H. Al-Shaikh Hussin

Transparent nano- coating was prepared by Sol-Gel method from titanium dioxide TiO2 which has the ability to self-cleaning coating used for hospitals, laboratories, and places requiring permanent sterilization. Three primary colors are selected (red, blue, and yellow) as preliminary study to the effect of these colors on the nano-coating. Three traditional oil paints color were used as base, then coated by a layer of TiO2-Sol and deposited on the paints. The optical properties of TiO2-Sol were measured; the maximum absorption wavelength at (λmax=387 nm), the refractive index (n=1.4423) and the energy band gap (Eg=3.2 eV). The structure properties found by X-ray diffraction of TiO2-Sol illustrated that TiO2-Sol is polycrystalline nanoparticle have anatase phase also the morphological properties measured by Scanning Electron Microscopy (SEM) obetained the average grain size of TiO2-Sol was (50.427 nm). Self-cleaning properties measured by tensiometer dives. The best color gave the highest response to self-cleaning is the yellow color where the contact angle before exposure to UV ( = 101.47º ,at t = 0 min) and after exposure over time ( = 1.75º ,at t = 50 min), thus the water sheet of the surface and remove all contaminants.


2019 ◽  
Vol 26 (1) ◽  
pp. 260-276 ◽  
Author(s):  
Anuar Nawawi ◽  
Ahmad Saiful Azlin Puteh Salin

PurposeMany corporate scandals that occurred recently have indicated the importance of a whistle-blowing mechanism in preventing fraud and malpractices from damaging the organizations. By selecting one organization that has experienced a corporate scandal, this study aims to examine factors that influence employee’s intention to blow the whistle to prevent malpractices in the company. In addition, this study also examines the perceptions of employees regarding the business culture in their organization and how this culture impacts their intention to whistle-blow.Design/methodology/approachThis study engages in a mixed method of data collection, namely, survey questionnaire and interviews to gather the data.FindingsIt is found that retaliation is the most important factor that influences the employee’s intention to whistle-blow, followed by the burden to prove the malpractices, cost implications as a result of the wrongdoing and the action taken by the authority as a result of the fraud reporting. In terms of business culture, a large number of employees are reluctant to become a whistle-blower, although a secured and safe whistle-blowing mechanism is in place, indicating that Asian customs of collectivism and assertiveness play a major part in shaping the whistle-blowing mechanism in Malaysian organizations.Research limitations/implicationsThe results provide further confirmation of the determinants that influence employees to report wrongdoings in the organizations. This study however may subject to self-reported data biasness because of sensitivity of the research that related to fraud and immoral behaviours that occur in the company. Owing to this sensitivity, the study only focuses on employees’ internal whistle-blowing intentions rather than their actual intentions.Practical implicationsThis study helps the management to understand the working culture in the company so that they can identify the weak area of governance which needs improvement such as whistle-blower protection.Originality/valueThis study is original, as it focuses on the employees in a big organization such as government link companies that have experienced corporate scandals albeit having whistle-blowing mechanism in place. In addition, the finding of this study contributes to the theory and body of the literature on the whistle-blowing determinants, currently scarce in the context of a developing country like Malaysia.


2019 ◽  
Vol 11 (2) ◽  
pp. 196-207 ◽  
Author(s):  
Sergey Yagolkovskiy

Purpose This paper aims to investigate relationships among correlates of individual innovative activity: creativity, innovativeness, novelty seeking and intelligence. Design/methodology/approach Data were collected from 202 students of the Higher School of Economics (123 females and 79 males). Findings The findings revealed significant relations between intelligence and fluency of participants’ creative performances, as well as novelty seeking and innovativeness. Research limitations/implications Limitations include the correlation design, the sample of students and the self-reported measures for novelty seeking and innovativeness. Practical implications The paper proposes a number of implications for researchers and practitioners who deal with innovation. The results of the study can be applied to various procedures and stages of innovation management. Originality/value The study contributes to knowledge on psychological correlates of innovation on an individual level, such as creativity, innovativeness, novelty seeking and intelligence, as well as produces an empirically validated model of the relationships among them.


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