Effect of Etching and Modification on the Hydrophobic Angle of Epoxy/Poss Nanomaterials

2020 ◽  
Vol 15 (12) ◽  
pp. 1502-1507
Author(s):  
Yanhong Fang ◽  
Ping Wang ◽  
Lifang Sun ◽  
Linhong Wang
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Hydrochloric Acid ◽  
Surface Energy ◽  
Stearic Acid ◽  
Acid Etching ◽  
Energy Materials ◽  
Nano Structure ◽  
Low Surface Energy ◽  
Long Time

In this study, simple and feasible methods are used to increase the hydrophobicity of EP-POSS, that is, etching with concentrated hydrochloric acid and concentrated ammonia water, followed by modification with polytetrafluoroethylene and stearic acid. The principle of the study is to increase the hydrophobic angle of EP-POSS by immersion in concentrated hydrochloric acid and concentrated ammonia for a sufficiently long time, followed by modification with low-surface-energy materials, i.e., polytetrafluoroethylene and stearic acid. The contact angle of EP-POSS increased from 100° to 133° after immersing in 3 mol/L hydrochloric acid for 12 min. Compared to hydrochloric acid, the surface roughness and contact angel were not changed significantly by immersing in concentrated ammonia for 4 hours. The contact angle was not changed obviously after immersing in 0.1 mol/L polytetrafluoroethylene for 24 h, and only changed from 135° to 136° when immersed in 0.1 mol/L stearic acid. It shows that PTFE and stearic acid hasn?t effectively grafted to the surface of EP-POSS, and has no effect to the micro-nano structure of EP-POSS. According to the experimental results, hydrochloric acid etching is the proper way to enhance EP-POSS contact angel. According to further investigates, it can be determined that treating EP-POSS at 40 °C for 12 min with 3 mol/L hydrochloric acid can significantly improve its hydrophobicity, thus, the hydrophobic performance of EP-POSS is considerably improved.

Superamphiphobic surfaces

2014 ◽  
Vol 43 (8) ◽  
pp. 2784-2798 ◽  
Author(s):  
Zonglin Chu ◽  
Stefan Seeger
Keyword(s):  
Surface Roughness ◽  
Surface Modification ◽  
Surface Energy ◽  
Energy Materials ◽  
Low Surface Energy

Progress in superamphiphobic surfaces, including the characterization, different techniques towards the fabrication of surface roughness and surface modification with low-surface-energy materials as well as their applications, is reviewed.

scholarly journals Fabrication and Evaluation of Nano-TiO2 Superhydrophobic Coating on Asphalt Pavement

Materials ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 211
Author(s):  
Hongfeng Li ◽  
Xiangwen Lin ◽  
Hongguang Wang
Keyword(s):  
Contact Angle ◽  
Stearic Acid ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Waterborne Polyurethane ◽  
Superhydrophobic Coating ◽  
Nano Tio2 ◽  
Sem Image ◽  
Low Surface Energy ◽  
Water Damage

In order to address water damage of asphalt pavement, reduce the occurrence of water-related potholes, deformation, and other diseases, and improve the performance and service life of the pavement, a nano-TiO2 superhydrophobic coating (PSC) on asphalt pavement was prepared from waterborne polyurethane and nano-TiO2 modified by stearic acid. FT-IR measured stearic acid successfully modified low surface energy substance on the surface of nano-TiO2. The SEM image shows that the PSC has a rough surface structure. The contact angle and rolling angle of the PSC in the contact angle test are 153.5° and 4.7°, respectively. PSC has a super-hydrophobic ability, which can improve the water stability of the asphalt mixture. Although the texture depth and pendulum value have been reduced by 2.5% and 4.4%, respectively, they all comply with the standard requirements. After the abrasion resistance test, the PSC coating still has a certain hydrophobic ability. These results surface PSC coating can effectively reduce water damage on asphalt pavement, and has considerable application value.

scholarly journals A Novel Synthetic UV-Curable Fluorinated Siloxane Resin for Low Surface Energy Coating

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 979 ◽  
Author(s):  
Chunfang Zhu ◽  
Haitao Yang ◽  
Hongbo Liang ◽  
Zhengyue Wang ◽  
Jun Dong ◽  
...  
Keyword(s):  
Surface Energy ◽  
Photoelectron Spectroscopy ◽  
Contact Angles ◽  
Proton Nuclear Magnetic Resonance ◽  
Energy Materials ◽  
Uv Curable ◽  
X Ray ◽  
Low Surface Energy ◽  
Low Concentrations ◽  
Siloxane Polymers

Low surface energy materials have attracted much attention due to their properties and various applications. In this work, we synthesized and characterized a series of ultraviolet (UV)-curable fluorinated siloxane polymers with various fluorinated acrylates—hexafluorobutyl acrylate, dodecafluoroheptyl acrylate, and trifluorooctyl methacrylate—grafted onto a hydrogen-containing poly(dimethylsiloxane) backbone. The structures of the fluorinated siloxane polymers were measured and confirmed by proton nuclear magnetic resonance and Fourier transform infrared spectroscopy. Then the polymers were used as surface modifiers of UV-curable commercial polyurethane (DR-U356) at different concentrations (1, 2, 3, 4, 5, and 10 wt %). Among three formulations of these fluorinated siloxane polymers modified with DR-U356, hydrophobic states (91°, 92°, and 98°) were obtained at low concentrations (1 wt %). The DR-U356 resin is only in the hydrophilic state at 59.41°. The fluorine and siloxane element contents were investigated by X-ray photoelectron spectroscopy and the results indicated that the fluorinated and siloxane elements were liable to migrate to the surface of resins. The results of the friction recovering assays showed that the recorded contact angles of the series of fluorinated siloxane resins were higher than the original values after the friction-annealing progressing.

Addition of Cellulose Nanofibers to Control Surface Roughness for Hydrophobic Ceramic Coatings

2021 ◽  
Vol 21 (8) ◽  
pp. 4492-4497
Author(s):  
Eun Ae Shin ◽  
Gye Hyeon Kim ◽  
Jeyoung Jung ◽  
Sang Bong Lee ◽  
Chang Kee Lee
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Surface Energy ◽  
Water Contact Angle ◽  
Ceramic Coating ◽  
Cellulose Nanofibers ◽  
Ceramic Coatings ◽  
Coating Material ◽  
Textured Surface ◽  
Water Contact

Hydrophobic ceramic coatings are used for a variety of applications. Generally, hydrophobic coating surfaces are obtained by reducing the surface energy of the coating material or by forming a highly textured surface. Reducing the surface energy of the coating material requires additional costs and processing and changes the surface properties of the ceramic coating. In this study, we introduce a simple method to improve the hydrophobicity of ceramic coatings by implementing a textured surface without chemical modification of the surface. The ceramic coating solution was first prepared by adding cellulose nanofibers (CNFs) and then applied to a polypropylene (PP) substrate. The surface roughness increased as the amount of added CNFs increased, increasing the water contact angle of the surface. When the amount of CNFs added was corresponding to 10% of the solid content, the surface roughness average of the area was 43.8 μm. This is an increase of approximately 140% from 3.1 μm (the value of the surface roughness of the surface without added CNFs). In addition, the water contact angle of the coating with added CNF increased to 145.0°, which was 46% higher than that without the CNFs. The hydrophobicity of ceramic coatings with added CNFs was better because of changes in the surface topography. After coating and drying, the CNFs randomly accumulated inside the ceramic coating layer, forming a textured surface. Thus, hydrophobicity was improved by implementing a rugged ceramic surface without revealing the surface of the CNFs inside the ceramic layer.

scholarly journals Superhydrophobic engineering materials provide a rapid and simple route for highly efficient self-driven crude oil spill cleanup

RSC Advances ◽  
2018 ◽  
Vol 8 (67) ◽  
pp. 38363-38369 ◽  
Author(s):  
Hongbo Xu ◽  
Shulong Bao ◽  
Liuting Gong ◽  
Renping Ma ◽  
Lei Pan ◽  
...  
Keyword(s):  
Surface Energy ◽  
Crude Oil ◽  
Rough Surface ◽  
Oil Spill ◽  
Material Surface ◽  
Energy Materials ◽  
Simple Route ◽  
Low Surface Energy ◽  
Oil Spill Cleanup ◽  
Crude Oil Spill

Traditional superhydrophobic material use depends on two processes: creating a rough structure on a material surface and modifying the rough surface with low surface energy materials.

scholarly journals A note on the effect of surface topography on adhesion of hard elastic rough bodies with low surface energy

2019 ◽  
Vol 28 (1) ◽  
pp. 8-12 ◽  
Author(s):  
Guido Violano ◽  
Giuseppe Demelio ◽  
Luciano Afferrante
Keyword(s):  
Surface Roughness ◽  
Surface Energy ◽  
Adhesive Contact ◽  
Low Surface Energy ◽  
Surface Gradient ◽  
Self Consistent ◽  
Remarkable Result ◽  
Roughness Amplitude ◽  
Adhesive Interactions ◽  
Effect Of Surface

AbstractAdhesion between bodies is strongly influenced by surface roughness. In this note, we try to clarify how the statistical properties of the contacting surfaces affect the adhesion under the assumption of long-range adhesive interactions.Specifically, we show that the adhesive interactions are influenced only by the roughness amplitude hrms, while the rms surface gradient h0rmsonly affects the non-adhesive contact force. This is a remarkable result if one takes into account the intrinsic difficulty in defining $h_{\mathrm{rms}}^{^{\prime }}.$Results are also corroborated by a comparison with self-consistent numerical calculations.

Preparation of Hydrophobic Nylon Fabric

2016 ◽  
Vol 11 (1) ◽  
pp. 155892501601100
Author(s):  
Jinmei Du ◽  
Lulu Zhang ◽  
Jing Dong ◽  
Ying Li ◽  
Changhai Xu ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Surface Energy ◽  
Water Contact Angle ◽  
Sem Images ◽  
Water Contact ◽  
Carboxyl Content ◽  
Factors Affecting ◽  
Nylon Fabric ◽  
Butanetetracarboxylic Acid

Surface roughness and surface energy are two important factors affecting the hydrophobicity of nylon fabric. In this study, nylon fabric was treated for hydrophobicity with tetrabutyltitanate (TBT) and octadecylamine (OA) which were respectively responsible for increasing surface roughness and reducing surface energy. In order to enhance the hydrophobicity, In order to further enhance hydrophobicity by increasing available reactive sites, 1,2,3,4–butanetetracarboxylic acid (BTCA) was applied as a pretreatment to the nylon fabric It was found that the carboxyl content of nylon was increased by the BTCA pretreatment. SEM images showed that the TBT treatment produced small particles on nylon fabric which made surface rough. The water contact angle of nylon fabric treated with BTCA, TBT and OA was measured to be 134°, which was much greater than the water contact angle of nylon fabric treated only with OA. This indicated that the surface roughness resulting from the TBT treatment played an important role in improving hydrophobicity of the treated nylon fabric. The resistance to water penetration and the repellency of water spray of nylon fabric treated with BTCA, TBT and OA were respectively measured to be 27.64 mbar and 85 out of 100.

Fabrication and Characterization of Superhydrophobic Film on Titanium Substrate

2013 ◽  
Vol 834-836 ◽  
pp. 29-32
Author(s):  
Dong Ping Long ◽  
Jian Rong Xue ◽  
Zhi Xin Yan
Keyword(s):  
Contact Angle ◽  
Titanium Substrate ◽  
Electrochemical Anodization ◽  
Porous Structures ◽  
Test Results ◽  
Nano Structure ◽  
Low Surface Energy ◽  
Nano Structures ◽  
Fluorinated Silane

TiO2 nano film with different nano structure were prepared on the surfaces of titanium TA1 and titanium alloy TC4 via electrochemical anodization. The surface morphology was observed with SEM, and it is found that TiO2 films prepared on TA1 surface have porous structures, while the TiO2 films synthesized on TC4 surface look like nano rod. The contact angle(CA) test results show that the TiO2 nano film prepared on TA1 is hydrophilicity and the CA is about 19°,the film on the TC4 is super hydrophilicity and its CA is smaller than 2°. After combined with fluorinated silane the self-assembled film synthesized on the surfaces and they are superhy- drophobic and the Contact angle is 150° and 158° respectively. It is concluded that both nano- structures and fluoroalkysilanes with low surface energy have play an important role in the wettability with the contact angle is more than 150°. The surface only have nano roughness without the low energy does not show superhydrophobicity.

Fabrication and Characterization of a Superhydrophobic Low-Density Polyethylene Film

2012 ◽  
Vol 557-559 ◽  
pp. 1834-1837
Author(s):  
Jun Liang Wu ◽  
Hui Ping Zhang ◽  
Xu Nan Wang
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Energy Materials ◽  
Water Contact ◽  
Simple Method ◽  
Ldpe Film ◽  
Low Surface Energy ◽  
Special Surface ◽  
Superhydrophobic Property

A superhydrophobic LDPE film was obtained by a simple method in atmosphere without addition of low-surface-energy materials. The water contact angle of the superhydrophobic LDPE film are 155±1.9º. SEM shows that compared with common smooth LDPE film, a porous structure was obviously observed on the superhydrophobic LDPE film. Such a special surface microstructure may result in the superhydrophobic property. The effect of drying temperature and concentration on water contact angle were studied.

Preparation of Nanostructured Superhydrophobic Copper and Aluminum Surfaces

2011 ◽  
Vol 409 ◽  
pp. 497-501 ◽  
Author(s):  
Ying Huang ◽  
Dilip K. Sarkar ◽  
X. Grant Chen
Keyword(s):  
Surface Energy ◽  
Stearic Acid ◽  
Water Drop ◽  
Deposition Potential ◽  
Copper Electrode ◽  
Copper Films ◽  
X Ray Diffraction ◽  
Low Surface Energy ◽  
Aluminum Substrates ◽  
Aluminum Surfaces

Preparation of nanostructured superhydrophobic surfaces requires both an optimum roughness and low surface energy. Application of a direct voltage between two copper plates immersed in a dilute ethanolic stearic acid solution transforms the surface of the anodic copper electrode to superhydrophobic due to the formation of micro-nanofibrous low surface energy flower-like copper stearate as confirmed by scanning electron microscope (SEM). Nanostructured superhydrophobic aluminum surfaces have also been prepared by electrodeposition of copper films on aluminum surfaces followed by electrochemical modification by ethanolic stearic acid. The X-ray diffraction (XRD) analyses confirmed the formation of copper films on aluminum substrates. The electrodeposited copper films are composed of microdots of copper whose density increases with the decrease of deposition potential as observed by SEM. The deposited copper microdots on aluminum substrates were electrochemically modified to low surface energy copper stearate nanofibres to obtain superhydrophobicity. The copper films deposited at potentials above-0.6 V did not exhibit superhydrophobic properties. However, the copper films deposited at potential-0.6 V and below exhibited superhydrophobic properties with water drop rolling-off those surfaces.

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