The anisotropic characteristics of natural fibrous sepiolite as revealed by contact angle, surface free energy, AFM and molecular dynamics simulation

Benli, B.; Du, Hao; Çelik, M. S.

doi:10.1016/j.colsurfa.2012.04.018

Cited by 39 publications

(24 citation statements)

References 74 publications

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“…To specifically quantify the wettability, contact angle and surface free energy (SFE) are the most commonly used indicators [9]. Contact angle is a quick and convenient indicator to evaluate the wettability between test liquid and solid surface [10]. When the contact angle is 0 • , the liquid completely infiltrates the solid surface; when the contact angle is 180 • , the liquid is spherical on the solid surface and the liquid completely un-infiltrated the solid surface; when the contact angle is between 0 • and 90 • , it is considered to be hydrophilic; when the contact angle is between 90 • and 180 • , it is considered to be hydrophobic [11].…”

Section: Introductionmentioning

confidence: 99%

Influence of Multiple Factors on the Wettability and Surface Free Energy of Leaf Surface

Xiao

Jianjian

et al. 2019

Applied Sciences

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The wettability of plant leaves directly reflects leaf hydrophilicity, which is the key factor that influences the adhesion of liquid pesticide as well as affects plant protection products (PPP) efficacy. Generally, the wettability of leaf surface is quantified by the contact angle and surface free energy (SFE), which are mainly dependent on leaf surface properties, liquid properties and other spraying parameters. Therefore, the aim of this paper was to investigate the SFE of rice and rape leaves with the variation of leaf status, leaf surface, and probe liquid as well as the influence of droplet falling height, solid surface, and PPP concentration on the wettability. The results showed that: (1) the dispersive components of SFE of rice and rape account for a large proportion which are closely related to their hydrophobicity—the abaxial of rape new leaf and the adaxial of rape old leaf are easier to wet comparing with rice and rape leaves in other statuses; (2) the increase of droplet falling height had a significant effect on improving the wettability between wax surface and adjuvant solution, while it had little improving effect on the wettability between wax surface and water; (3) the wettability of different solid surface varied greatly, and the order of wettability from good to bad is water-sensitive paper (WSP), wax, rape leaf, and rice leaf; (4) the effect of PPP concentration on the leaf surface wettability is significant, the contact angle decreased with the increase of PPP concentration, and the wettability of microemulsion is better than that of suspending agent and wettable powder. In conclusion, the SFE and wettability of crop leaf surface determine the suitable type of PPP, studying the influence of multiple factors on leaf surface wettability can provide a reliable reference for providing scientific guidance as well as improving the effective utilization of PPP.

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Section: Introductionmentioning

confidence: 99%

Influence of Multiple Factors on the Wettability and Surface Free Energy of Leaf Surface

Xiao

Jianjian

et al. 2019

Applied Sciences

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“…From Figure 1, it can be seen that the sepiolite nanofibers after modification with the coupling agent ( -(2,3-epoxypropoxy)propyltrimethoxysilane) addition amount of 5% have the lowest surface free energy. When powders are dispersed into media, the lower the surface free energy, the better their dispersion [30][31][32]. According to the above analysis, 5% is selected as the coupling agent ( -(2,3-epoxypropoxy)propyltrimethoxysilane) addition amount for the sepiolite nanofibers in order to obtain the best modification effect of sepiolite nanofibers and the optimal properties of composite materials.…”

Section: Resultsmentioning

confidence: 99%

Effect of Modified Sepiolite Nanofibers on Properties of cis‐Polybutadiene Rubber Composite Nanomaterials

Wang

Feng²,

Tang

et al. 2013

Journal of Nanomaterials

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In order to use sepiolite nanofibers ascis-polybutadiene rubber fillers, the hydrophilic character of sepiolite nanofibers should be modified by grafting organic group and controlling surface free energy for improving compatibility of sepiolite nanofibers in rubber matrix. The relationship between the performance of thecis-polybutadiene rubber filled with sepiolite and the coupling modification was investigated, and the influence of coupling agentγ-(2,3-epoxypropoxy)propyltrimethoxysilane dosage on mechanical properties ofcis-polybutadiene rubber materials was also studied. The results showed that the mechanical properties could be improved obviously after reinforcement by modified sepiolite nanofibers. The optimum dosage of coupling agentγ-(2,3-epoxypropoxy)propyltrimethoxysilane was 7%, and the tensile strength and tearing strength increased by 108.3% and 74.1%, respectively. On this basis, the reinforcement mechanism of the composite rubber materials was also discussed.

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“…A similar mode (3420 cm -1 ) was reported by Giustetto et al (2011b) in a sepiolite + indigo (2 wt %) composite heated at 150 °C in vacuum, and attributed to structural OH2 perturbed by H-bonds with the incorporated dye. In the present study, the band tentatively result from unspecific interactions existing between structural OH2 at the tunnel edges and superficial grooves (Benli et al, 2012) and the almost continuous hydrocarbons film covering most fibrils.…”

Section: Fourier Transform Ir Spectroscopy (Insert Figure 7)mentioning

confidence: 92%

Asbestiform sepiolite coated by aliphatic hydrocarbons from Perletoa, Aosta Valley Region (Western Alps, Italy): characterization, genesis and possible hazards

Giustetto

Seenivasan²,

Belluso

2014

Mineral. mag.

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An atypical asbestiform sepiolite occurrence with exceptionally long fibres wrapped by a sheath of aliphatic hydrocarbons was found in the Gressoney Valley (Italian Western Alps) while monitoring asbestos presence in outcrops of serpentinite rocks. Microscopic and Fourier transform infrared analyses proved that these fibres, apparently up to several cm long, are formed by bundles of thinner fibrils (average length: 150 μm) potentially dispersible in the environment. When observed using transmission electron microscopy these fibrils show a rhomboidal to parallelogram cross section (<1 μm), of which surfaces are covered mostly by an aliphatic hydrocarbon film – an association not reported in the literature. The sepiolite fibrils and their organic coating probably originated in sequential steps from precipitation of Si/Mg rich hydrothermal fluids, resulting from serpentinization of olivine and clinopyroxene and a Fischer-Tropsch-type reaction. The presence of hydrocarbons has serious implications for the sepiolite habit, as the organic wrap interacts with the fibril’s surface reducing the amount of adsorbed water and favouring the fragmentation of thicker units into thinner ones, due to an ‘opening’ process implying separation along z and cleavage on (110). This defibrillation mechanism, coupled with the extraordinary length, further increases the aspect ratio of these fibrils (length/width ≫3) thus amplifying their potential danger for human health when dispersed in air and inhaled.

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The anisotropic characteristics of natural fibrous sepiolite as revealed by contact angle, surface free energy, AFM and molecular dynamics simulation

Cited by 39 publications

References 74 publications

Influence of Multiple Factors on the Wettability and Surface Free Energy of Leaf Surface

Influence of Multiple Factors on the Wettability and Surface Free Energy of Leaf Surface

Effect of Modified Sepiolite Nanofibers on Properties of cis‐Polybutadiene Rubber Composite Nanomaterials

Asbestiform sepiolite coated by aliphatic hydrocarbons from Perletoa, Aosta Valley Region (Western Alps, Italy): characterization, genesis and possible hazards

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