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RATING OF THE VALENCE OF TWENTY NEGATIVES IMAGES FROM IAPS BY A SAMPLE OF MOROCCAN NURSE STUDENTS

100%
Bandadi L., Touhami Ahami A. O., Ahami A. O. T.
Acta Neuropsychologica
|
2020
|
vol. 18(3)
383-391
EN
This study aims to rate twenty negative images from IAPS among a sample nurse students. We compare the mean valences between males and females and between participants from the final semester and participants from the first semester. The comparison of the mean valences values between the current study and the norm mean valence values from IAPS was established. null We tested 100 students from Higher Institute of Nursing Professions and Technics of Health, Rabat, Morocco, were recruited. The panel valence from SAM was cued to evaluate the perceived pleasure and unpleased degree after exposing the different images from IAPS to the participants. The displeasure degree among nurse students from final semester is lower than that of the first semester with a significant difference in sixteen images. Regarding the difference between males and females, the significant difference was observed only in five images. The all images evaluated by participant were perceived as negative (valence <4). Regarding the comparison of the mean valences values between a the current study and the norm mean valence values from IAPS significant differences were observed. Nurse students from the final semester, compared to the first semester students, perceived the negative images assessed as less unpleasant. However, we noted that the all images have kept the negative aspect. These results show that these images can be used as a negative emotional stimulus among this population.
2
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Temperature-induced phase transition; Polymorphism in BP2 SAMs on Au(111)

88%
Azzam W.
Open Chemistry
|
2009
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vol. 7
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issue 4
884-899
EN
Self-assembled monolayers (SAMs) of ω-(4′-methylbiphenyl-4-yl)ethanethiol (CH3(C6H4)2(CH2)2SH, BP2) prepared at different temperatures on Au(111) substrates were investigated using scanning tunneling microscopy (STM). Also, the effect of the incubation time of the gold substrate in the thiol solution was examined. The STM results showed that samples prepared at room temperature were significantly different from those prepared at elevated temperatures in their surface morphology, space group and size of unit cell. The micrographs of samples prepared at higher temperatures revealed a pronounced and progressive increase in the size of the well-known etch-pits at the expense of their density with increasing preparation temperature (but the increase did not continue for SAMs prepared at 348 K). The average domain size was found to increase significantly with increasing preparation temperature. In addition, polymorphism was observed in BP2 SAMs at all investigated temperatures. This study has demonstrated that solution temperature and incubation time are key factors controlling the two-dimensional SAM structure of BP2 molecules. [...]
3
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Chemical stability of plasmon-active silver tips for tip-enhanced Raman spectroscopy

75%
Kalbacova J., Rodriguez R. D., Desale V., Schneider M., Amin I., Jordan R., Zahn D. R. T.
Nanospectroscopy
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2014
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vol. 1
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issue 1
EN
Silver nanostructures are used in tip- and surface-enhanced Raman spectroscopy due to their high electric field enhancement over almost the entire visible spectral range. However, the low chemical stability of silver, compared to other noble metals, promotes silver sulfide and sulfate formation which decreases its plasmonic activity. This is why silver tips are usually prepared on the same day of the experiments or are disregarded in favour of gold that is chemically more stable. Since silver degradation cannot be avoided, we hypothesized that a protection layer may be able to minimize or control degradation. In this contribution, we report the successful preparation of 4-biphenylthiol and 4’-nitro-4-biphenylthiol self-assembled monolayers on silver tips in order to protect them against tarnishing and to investigate the effect on the life-time of the plasmonic activity. The electrochemically etched wire surface was probed via Raman spectroscopy and scanning electron microscopy. The best long term stability and resistance against corrosion was shown by a monolayer of 4-biphenylthiol formed from dimethylformamide which did not display any degradation of the metallic tip during the observed period. Here, we demonstrate an easy and straightforward approach towards increasing the chemical stability of silver TERS-active probes.
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