scholarly journals DESIGN OF TEXTILE UV-SHIELDS BY VAT DYES MODIFICATION

2019 ◽  
Vol 2019 ◽  
pp. 59-62
Author(s):  
Viktoriia VLASENKO ◽  
Svitlana ARABULI ◽  
Valentyna KUCHERENKO ◽  
Arsenii ARABULI ◽  
Petro SMERTENKO ◽  
...  

The problem of human being protecting against UV radiation is becoming more and more significant from year to year and requires urgent solutions. Just UVB causes 50-90% of skin cancer and especially affects children, adolescents and older people. Textile screens are the simplest and most effective means to protect against the negative effects of UV radiation (UVR). Usually, white cotton and linen fabrics are used for summer clothes. However, these materials have a low ultraviolet protective factor (UPF ~ 5). Known developments that relate to the modification of textile materials to protect against UV radiation, suggest the use of dense woven structures; modification with some metals oxides; the use of UV absorbers that are derivats of harmful chemicals (for example, o-hydroxybenzophenones). But these methods do not always provide the sufficiently level of UV protection. In our paper, the effectiveness of vat dyes using to create textile screens for UV protection was investigated. In this study was investigated cotton fabrics dyed with some vat dyes: turquoise, blue, yellow. UVR transmittance studies were performed on optical spectrometer Solar SL40-2 (PSI-Line software). A high pressure discharge lamp DRT-125 was used. As studies have shown, the most effective is a cotton textile screen, dyed with vat blue.

Author(s):  
С. І. Арабулі ◽  
А. Т. Арабулі ◽  
В. С. Труба ◽  
Д. Р. Левицька

Study the possibility of using textile materials for shielding against the negative effects of ultraviolet radiation. Methodology. Theoretical and experimental researchs are based on the basic principles of textile materials science. The UV shielding ability of textiles was assessed by the UV protection factor (UPF). The UV  protection  factor  was  evaluated  on  a  UV-Vis  spectrophotometer  (Cary  50,  Varian,  Australia)  in accordance with AS / NZ 4399: 1996 in the wavelength range 280-400 nm. According to AS / NZ 4399: 1996, textiles are classified according to the value of the UV protection factor (UPF) as those that provide "excellent UV protection", "very good UV protection", "good UV protection", "does not protect against UV radiation." Results. The main sources of UV radiation are analyzed and the features of the conditions of human exposure when working indoors and outside are considered. It has been established that the degree of human exposure depends on the intensity of UV radiation, and can be reduced by using protective equipment. Flexible textile screens can be one of the effective means of protection against UV radiation. The advantages of textile screens are the possibility of their modification and the ability to create shielding products of various shapes. The level of protective properties of textile screens depends on many factors, namely: the chemical nature of the polymer of textile materials, structural characteristics, modification by certain substances, color, moisture, etc. The results of the study of the coefficient of protection against ultraviolet radiation of textile materials, depending on their color are presented. Scientific novelty. It is proved that the optical properties are not only important for the evaluation of appearance of the textile and garment aesthetic perception, they can control the shielding properties of the textile  to  the  action  of  UV  radiation.  It  was  found  that  dark  saturated  colors  of  textile  fabrics,  all  other conditions being equal, provide shielding properties at the level of "very good protection" compared to light unsaturated colors (the UPF level varies from 10 to 35 with increasing color saturation). Practical value. The possibility of using textile materials for UV protection has been confirmed.


2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Nuket Ocal ◽  
Acelya Aker ◽  
Hikmet Nil Ergindemir ◽  
Agamirze Hamitbeyli

Novel Schiff bases with the potential to exhibit biologically active and UV absorption properties were synthesized. Their application on cotton based textile materials was performed and the UV protection factor (UPF) values and the antibacterial features of the treated fabrics were measured.


2012 ◽  
Vol 26 (5) ◽  
pp. 536-549 ◽  
Author(s):  
Bart Duriez ◽  
Theo A. Klimstra ◽  
Koen Luyckx ◽  
Wim Beyers ◽  
Bart Soenens

Because the authoritarian personality was introduced to explain the rise of fascism during World War II, research focused on its ability to predict prejudice, leaving its associations with well–being largely unexplored. Studies that did examine these associations yielded inconsistent results, and some authors even argued that authoritarianism buffers against the negative effects of psychological vulnerability factors (i.e. D–type personality) and negative life events on well–being, especially among people in an authoritarian environment. Using a cross–sectional community sample (N = 1010), Study 1 failed to support the idea that authoritarianism relates to depressive symptoms and buffers against the negative effects of D–type personality on depressive symptoms. Using a longitudinal college student sample (N = 499), Study 2 showed that authoritarianism did not moderate the effects of life events either and even predicted over–time increases in depressive symptoms. Using a longitudinal high school sample (N = 590), Study 3 showed that this effect emerged regardless of degree of fit with the social environment (i.e. with family and friends). Taken together, results suggest that authoritarianism constitutes a risk factor for rather than a protective factor against depressive symptoms. Copyright © 2011 John Wiley & Sons, Ltd.


2021 ◽  
Author(s):  
Hongchen Liu ◽  
Hongying Yang ◽  
Kunkun Zhu ◽  
Fang Peng ◽  
Lei Guo ◽  
...  

Excessive exposure to ultraviolet (UV) light is harmful to human health. However, the traditional preparation of anti-UV films through doping UV absorbers is unstable. Chemical modification of polyvinyl alcohol (PVA)...


2017 ◽  
Vol 4 (2) ◽  
Author(s):  
Aaiz Ahmed ◽  
Stephen S

This study aimed to describe how, why and to what extent psychology students self-diagnose and what impact this has on their lives, using an in-depth qualitative exploration. A sample of 8 students were taken and interviews were administered on them. Inductive thematic analysis was conducted on the results, revealing four global themes. These were: Causes of Self-Diagnosis, Methods of Self-Diagnosis, Effects of Self-Diagnosis and Academic Maturity. It was concluded that students self-diagnose based on earlier experiences as well as psychological information they learn in an academic setting and introspection methods. Factors such as schematic thinking played a role in self-diagnosis and it had positive and negative effects, which can be classified as cognitive, affective and behavioural effects. Academic Maturity was seen to be a protective factor against the negative effects of self-diagnosis.


Biomedicines ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 77 ◽  
Author(s):  
Prasedya ◽  
Syafitri ◽  
Geraldine ◽  
Hamdin ◽  
Frediansyah ◽  
...  

Sunscreens today contain several synthetic UV (Ultraviolet) filter molecules to protect the skin epidermis from UV radiation damage. However, these molecules may create several negative effects on human skin. Due to this condition, there is an increase in the development of natural products to replace uses of these synthetic chemicals. Brown macroalgae Sargassum has been recently studied for its photoprotective activities. The purpose of this study is to investigate photoprotective activity of one of most abundant Sargassum species in Lombok coast; Sargassum cristaefolium. Spectrophotometry analysis with UV-VIS revealed the UV spectra absorbing capability of Sargassum cristaefolium (SC) in the UVA spectrum range (314–400 nm). Furthermore, spectrometry analyses with LC-MS revealed the existence of UV absorbing compound MAA-palythene. In correlation, SC ethanol extracts also demonstrate that it could protect DNA from UVA irradiation as analyzed in vitro in HeLa cell model. The effects of SC on UVA exposed-dorsal mice skin have also shown interesting results, as mice pretreated with SC before UVA exposure showed protective activity on the epidermal integrity similar as positive control. Whereas, UV exposed mice without SC or commercial products resulted in increased epidermal thickness, which is the common parameter of skin photoaging. In addition, pretreated mice with SC also show protective effects in the formation of collagen connective tissues. Overall, current results show promising photoprotective activity of SC against UV radiation. More advanced investigations of SC as a potential photoprotective agent would be reasonable for development of macroalgae-based natural skin protection products.


2018 ◽  
Vol 16 (1) ◽  
pp. 702-708
Author(s):  
Anum Sahar ◽  
Shaukat Ali ◽  
Tanveer Hussain ◽  
Nazish Jahan ◽  
Muhammad Anjum Zia

AbstractUV absorbers developed for finishing of textile materials play a significant role in protection against UV radiations but their discharge in wastewater during processing and laundry action also retain serious concern to living species due to their recalcitrant nature. The current study examined the mineralization and degradation of two vinylsulfone and nitrogen (N-) containing UV absorber compounds (1a, 2a) via two effective Fenton and UV/H2O2 oxidation. The results showed that both the Fenton and UV/H2O2 processes mineralized the synthesized UV absorbers effectively; however the mineralization process with Fenton oxidation was more effective than the UV/H2O2. The mineralization of synthesized UV absorbers was affected by process parameters (dosage of Fe2+ and H2O2 pH and reaction time). Under attained optimum conditions of Fenton oxidation, dose of Fe2+ (15 mg/L), H2O2 (500 mg/L), pH (3.0) and contact time (120 minutes), 75.43 and 77.54% of Chemical Oxygen Demand removal was achieved for 1a and 2a, respectively. Whereas, the optimum conditions of UV/H2O2 process were H2O2 (700 mg/L), pH(3.0) and irradiation time (200 minutes) that brought 54.33 and 57.65% COD removal in case of 1a and 2a, respectively. The results indicated that the Fenton oxidation can be successfully employed for the mineralization of triazine based UV absorbers.


2018 ◽  
Vol 9 (1) ◽  
pp. 60-79
Author(s):  
Andrea L. Ruiz ◽  
Gabriel A. Acevedo ◽  
Raquel R. Marquez ◽  
Marcos Marquez

Despite the strong empirical evidence linking childhood abuse to negative mental health outcomes later in life, a number of questions remain regarding race variations in this association. Moreover, less is known about the salience of protective factors that can offset or ameliorate the negative effects of abuse on adult mental health, and whether these factors work differently by race. Using three waves of panel data from a nationally representative survey of American adults, the present study examined the long-term effects of childhood abuse on adult mental health over a span of 20 years. In addition, we assessed social support as a protective factor, and examined its differential effects on mental health outcomes for Whites and non-Whites. Results indicate that despite frequent childhood abuse, social support is associated with less depression for Whites—its positive effects being most pronounced for those with the most severe abuse experiences. However, social support is associated with worst depression for non-Whites—its negative effects being most pronounced for those with severe abuse experiences. These findings demonstrate that the factors commonly considered as protective and beneficial for adult victims of abuse work differently across racial groups and in fact, may be detrimental for non-Whites.


Molecules ◽  
2016 ◽  
Vol 21 (6) ◽  
pp. 718 ◽  
Author(s):  
Hikmet Ergindemir ◽  
Acelya Aker ◽  
Agamirze Hamitbeyli ◽  
Nuket Ocal

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