Identification of α-Al2O3 surface sites and their role in the adsorption of stearic acid

Webber, J. M. B.; Zorzi, J. E.; Perottoni, C. A.; Silva, S. Moura e; Cruz, Robinson C.D.

doi:10.1007/s10853-016-9819-5

Cited by 23 publications

(11 citation statements)

References 52 publications

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“…These are formed by esterification between -CO 2 H in stearic acid and -OH in modified cellulose, indicating that stearic acid undergoes a chemical reaction with cellulose. The main bands between 815 and 1469 cm −1 were attributed to the δOH, νC-O, deformation bands of (-CH 2 -) n , and the out-of-plane vibration bands of O-H of stearic acid dimer [59,60]. The bands at 3024-3650 cm −1 correspond to the stretching vibrations of the OH of cellulose, which is the main element of flax created via β1-4 linked D-glucose.…”

Section: Characterization Of Composites Reinforced With Flax Fabrics mentioning

confidence: 99%

Effect of Carbon Nanostructures and Fatty Acid Treatment on the Mechanical and Thermal Performances of Flax/Polypropylene Composites

et al. 2020

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Four different strategies for mitigating the highly hydrophilic nature of flax fibers were investigated with a view to increase their compatibility with apolar polypropylene. The effects of two carbon nanostructures (graphene nanoplatelets (GNPs) and carbon nanotubes (CNTs)), of a chemical modification with a fatty acid (stearic acid), and of maleated polypropylene on interfacial adhesion, mechanical properties (tensile and flexural), and thermal stability (TGA) were compared. The best performance was achieved by a synergistic combination of GNPs and maleated polypropylene, which resulted in an increase in tensile strength and modulus of 42.46% and 54.96%, respectively, compared to baseline composites. Stearation proved to be an effective strategy for increasing the compatibility with apolar matrices when performed in an ethanol solution with a 0.4 M concentration. The results demonstrate that an adequate selection of surface modification strategies leads to considerable enhancements in targeted properties.

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Section: Characterization Of Composites Reinforced With Flax Fabrics mentioning

confidence: 99%

Effect of Carbon Nanostructures and Fatty Acid Treatment on the Mechanical and Thermal Performances of Flax/Polypropylene Composites

et al. 2020

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“…The absorption band at 1250 cm −1 corresponds to Si–O stretching vibration [ 35 , 36 ]. The broad absorption band at 950 cm −1 is attributed to the Al–O stretching vibration [ 37 ]. The broad band at 3400 cm −1 corresponds to various aluminum-based hydroxyls [ 37 , 38 , 39 , 40 , 41 ].…”

Section: Resultsmentioning

confidence: 99%

“…The broad absorption band at 950 cm −1 is attributed to the Al–O stretching vibration [ 37 ]. The broad band at 3400 cm −1 corresponds to various aluminum-based hydroxyls [ 37 , 38 , 39 , 40 , 41 ]. The sample which was not activated had no electrochemical processes on its surface, which corresponds to the relatively higher signal around 3400 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Full-Self-Powered Humidity Sensor Based on Electrochemical Aluminum–Water Reaction

Bošković

Šljukić

Radović

et al. 2021

Sensors

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A detailed examination of the principle of operation behind the functioning of the full-self-powered humidity sensor is presented. The sensor has been realized as a structure consisting of an interdigitated capacitor with aluminum thin-film digits. In this work, the details of its fabrication and activation are described in detail. The performed XRD, FTIR, SEM, AFM, and EIS analyses, as well as noise measurements, revealed that the dominant process of electricity generation is the electrochemical reaction between the sensor’s aluminum electrodes and the water from humid air in the presence of oxygen, which was the main goal of this work. The response of the sensor to human breath is also presented as a demonstration of its possible practical application.

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“…The appearance of these peaks is due to the destabilization of the double bond in C=O group of stearic acid after interaction with surface metal ions of fly ash. Thus, it is evident from FTIR results that stearic acid is bound to the surface of fly ash particles …”

Section: Resultsmentioning

confidence: 99%

Wetting Transition from Lotus Leaf to Rose Petal using Modified Fly Ash

2019

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We present a facile and scalable approach to develop lotus leaf as well rose petal like superhydrophobic surfaces using fly ash (an industrial waste obtained from the burning of coal). To achieve this, as‐obtained fly ash powder with wide particle size distribution (FA) was processed through sedimentation technique to obtain fly ash powder with narrower particle size distribution (FAS) and modified with two different concentrations of stearic acid (SA) and treated at two different temperatures – one each below and above melting point of SA. All samples showed superhydrophobicity, where, the water contact angle (WCA) increased with an increase in the amount of stearic acid and modification temperature. Interestingly, the water droplets roll‐off from the modified FA surfaces at a small tilting angle of 5° similar to the lotus leaf, whereas, the modified FAS surfaces exhibited high adhesion for water droplets even when inverted, as in case of the rose petal. It was seen that drying at temperature lower than melting temperature of stearic acid introduced additional roughness, yet the WCA decreased. This is investigated to understand the effect of topology and substrate nature on WCA in different wetting states.

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Identification of α-Al2O3 surface sites and their role in the adsorption of stearic acid

Cited by 23 publications

References 52 publications

Effect of Carbon Nanostructures and Fatty Acid Treatment on the Mechanical and Thermal Performances of Flax/Polypropylene Composites

Effect of Carbon Nanostructures and Fatty Acid Treatment on the Mechanical and Thermal Performances of Flax/Polypropylene Composites

Full-Self-Powered Humidity Sensor Based on Electrochemical Aluminum–Water Reaction

Wetting Transition from Lotus Leaf to Rose Petal using Modified Fly Ash

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