Contact angle measurement of natural materials

Zhao, Tianyi; Jiang, Lei

doi:10.1016/j.colsurfb.2017.10.056

Cited by 167 publications

(86 citation statements)

References 63 publications

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“…The contact angle for the commercial Ag NPs was observed to be 89° while that for the Ag@CD‐MOF was 32° (Figure S3, Supporting Information). The contact angle between 0° and 90° is considered as wettable and hydrophilic, while the surface with a contact angle greater than 90° is considered as hydrophobic . Wetting occurs when intermolecular interaction takes place depending upon the surface tension of liquid and surface free energy of solid .…”

Section: Resultsmentioning

confidence: 99%

“…The contact angle between 0° and 90° is considered as wettable and hydrophilic, while the surface with a contact angle greater than 90° is considered as hydrophobic. [32,33] Wetting occurs when intermolecular interaction takes place depending upon the surface tension of liquid and surface free energy of solid. [34] Here, the wettability of synthesized Ag@CD-MOF was observed higher than the commercial nanopowder.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

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Ultrafine Silver Nanoparticles Embedded in Cyclodextrin Metal‐Organic Frameworks with GRGDS Functionalization to Promote Antibacterial and Wound Healing Application

Shakya

Ren

et al. 2019

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112

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The challenge of bacterial infection increases the risk of mortality and morbidity in acute and chronic wound healing. Silver nanoparticles (Ag NPs) are a promising new version of conventional antibacterial nanosystem to fight against the bacterial resistance in concern of the drug discovery void. However, there are several challenges in controlling the size and colloidal stability of Ag NPs, which readily aggregate or coalesce in both solid and aqueous state. In this study, a template‐guided synthesis of ultrafine Ag NPs of around 2 nm using water‐soluble and biocompatible γ‐cyclodextrin metal‐organic frameworks (CD‐MOFs) is reported. The CD‐MOF based synthetic strategy integrates AgNO3 reduction and Ag NPs immobilization in one pot achieving dual functions of reduced particle size and enhanced stability. Meanwhile, the synthesized Ag NPs are easily dispersible in aqueous media and exhibit effective bacterial inhibition. The surface modification of cross‐linked CD‐MOF particles with GRGDS peptide boosts the hemostatic effect that further enhances wound healing in synergy with the antibacterial effect. Hence, the strategy of ultrafine Ag NPs synthesis and immobilization in CD‐MOFs together with GRGDS modification holds promising potential for the rational design of effective wound healing devices.

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Section: Resultsmentioning

confidence: 99%

Section: Synthesis and Characterizationmentioning

confidence: 99%

Ultrafine Silver Nanoparticles Embedded in Cyclodextrin Metal‐Organic Frameworks with GRGDS Functionalization to Promote Antibacterial and Wound Healing Application

Shakya

Ren

et al. 2019

Small

132

112

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“…), and gas-liquid dissolution and displacement. The physical structure and surface properties of low-rank coals affect the specific interactions between different liquids and coal, and consequently affect the ad-/desorption behavior of methane, for example, the contact angle (CA) between coal and water can be used to judge wettability, [16][17][18] which is mainly controlled by the material composition, oxygen-containing functional groups and surfactants. [19][20][21] Generally, coalbed in situ is difficult to change their composition and other properties.…”

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confidence: 99%

Wettability modification and its influence on methane adsorption/desorption: A case study in the Ordos Basin, China

Zhang

et al. 2019

Energy Science & Engineering

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Wettability modification of coal rock may cause serious change in the methane adsorption/desorption behaviors. Thus, the contact angle measurement and isothermal adsorption/desorption experiment of raw coal and samples treated with surfactants (STS) were conducted to investigate the wetting properties and methane adsorption/desorption characteristics. The results indicated that the long‐flame coal (LFC) has the good hydrophilicity itself, and there was no evident sign of saturated adsorption for different samples at relatively low‐pressure (<8 MPa) stage. The sample treated with the wettability reversal agent (G502) had the larger methane adsorption capacity than the wetted samples (LAS, JFC, and 6501), with the latter facilitating the methane desorption. Additionally, the adsorption capacity of the air‐dried samples was stronger than that of the water‐containing samples, including the moisture‐equilibrated, LAS, JFC, and 6501, reflecting that the better the hydrophilicity, the weaker the methane adsorption. Besides, the desorption hysteresis rate of the same sample was mainly controlled by pressure, i.e. the desorption hysteresis indicated a logarithmic decrease with the increasing pressure, but the STS clearly showed the desorption hysteresis to varying degree due to the wettability differences. The pressure drop in the low‐pressure stage was difficult to drive the adsorbed methane to immediately desorb from the matrix surface, whereas even caused further adsorption or re‐adsorption, meaning that the coal required a greater depressurization to enter the effective desorption stage. Finally, the positive implications of wettability modification including enhancing CBM recovery, as well as coal and methane outburst prevention and coal dust control in the mining industry were discussed.

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“…28 Next we consider an experimental dynamic CA measurement by adding/removing liquid. 34 For measuring the advancing CA, this method involves placing droplets onto solid surfaces and then gradually increasing droplet volume. At rst, the CA increases while the three-phase contact line is constant.…”

Section: Resultsmentioning

confidence: 99%

Numerical analysis of anisotropic wetting of chemically striped surfaces

Sui

Wang

et al. 2018

RSC Adv.

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In this paper, the measurement process of advancing and receding contact angles (CA) in experiments is simulated using Surface Evolver (SE). The normalized energy of the droplet is calculated by fixing the three-phase contact line that lies at the boundary between stripes and by changing the droplet volume.The most stable wetting state is determined for each stripe configuration. The slip-jump behavior of the three-phase contact line is observed. Furthermore, a small wet stripe width and large dry stripe width is found to be favorable for achieving large stable equilibrium CA. Moreover, the minimum advancing CA and maximum receding CA can be obtained by assigning a value of zero to the normalized energy barrier. The variation of minimum advancing CA and maximum receding CA with wet and dry stripe widths follows the same trend as the stable equilibrium CA. Combined with the existing model in the literature, the approach introduced in this paper can be used to narrow down the predicted range of dynamic CAs and also to provide guidance for designing anisotropic surfaces. Fig. 1 Simulation with surface evolver. (a) The initial droplet shape on top of 13 stripes. (b) The evolved droplet in the equilibrium wetting state. (c) Magnification of the region close to the contact line to illustrate a typical facet used for the contact angle measurement. (d) Schematic diagram of the contact angle measurement along the direction perpendicular to the stripes. 31736 | RSC Adv., 2018, 8, 31735-31744 This journal is

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Contact angle measurement of natural materials

Cited by 167 publications

References 63 publications

Ultrafine Silver Nanoparticles Embedded in Cyclodextrin Metal‐Organic Frameworks with GRGDS Functionalization to Promote Antibacterial and Wound Healing Application

Ultrafine Silver Nanoparticles Embedded in Cyclodextrin Metal‐Organic Frameworks with GRGDS Functionalization to Promote Antibacterial and Wound Healing Application

Wettability modification and its influence on methane adsorption/desorption: A case study in the Ordos Basin, China

Numerical analysis of anisotropic wetting of chemically striped surfaces

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