Repelling hot water from superhydrophobic surfaces based on carbon nanotubes

2015 ◽  
Vol 3 (33) ◽  
pp. 16953-16960 ◽  
Author(s):  
Fang Wan ◽  
De-Quan Yang ◽  
Edward Sacher
Keyword(s):  
Carbon Nanotubes ◽  
Contact Angle ◽  
Water Droplet ◽  
Room Temperature ◽  
Hot Water ◽  
Superhydrophobic Surfaces ◽  
Water Contact ◽  
Static Water Contact Angle ◽  
Slide Angle ◽  
Static Water

Superhydrophobic (SH) surfaces generally refer to those having a static water contact angle larger than 150° and a slide angle less than 10°, when both the surface and the water droplet are at room temperature.

scholarly journals Development of Superhydrophobic Polyester (Polyethylene terephthalate) Fabric for Multiple Applications

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Subhas Ghosh ◽  
Roopkatha Pallye
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Polyester Fabric ◽  
Ftir Analysis ◽  
Water Contact ◽  
Abrasion Test ◽  
Static Water Contact Angle ◽  
Static Water ◽  
Polyester Textile ◽  
Textile Fabric

This study intended to develop a healthy and environmentally friendly super-hydrophobic PET polyester textile fabric using a specific Fluoro Silane finish (SHF). A novel SHF was prepared and applied on a polyester fabric using a pad-dry-cure method. The finished fabric was evaluated for the degree of hydrophobicity, durability and stain repellence. The finished fabric exhibited static water contact angle greater than 170o and received 90 AATCC (4 ISO) rating that is recognized as super-hydrophobicity and this property was maintained even after a 50,000-cycle abrasion test. FTIR analysis identified the characteristic peaks related to Si-O-Si and C-F asymmetric stretching bands of the finish on the fabric indicating a robust attachment on the fabric. Finished fabric did not show any change in appearance or tactile characteristics of the fabric. 

Antigen detection with thermosensitive hydrophilicity of poly(N-isopropylacrylamide)-grafted poly(vinyl chloride) fibrous mats

2018 ◽  
Vol 6 (21) ◽  
pp. 3486-3496 ◽  
Author(s):  
Jian-Wei Guo ◽  
Zhen-Yu Lin ◽  
Bohr-Ran Huang ◽  
Chien-Hsing Lu ◽  
Jem-Kun Chen
Keyword(s):  
Contact Angle ◽  
Vinyl Chloride ◽  
Water Contact Angle ◽  
Antigen Detection ◽  
Stimuli Responsive ◽  
Water Contact ◽  
Static Water Contact Angle ◽  
Poly Vinyl Chloride ◽  
Static Water

The static water contact angle of stimuli-responsive fibrous mats is used as a convenient index for rapid antigen detection.

On Antireflective Coatings with Stable Hydrophobicity for Solar Tube

2013 ◽  
Vol 423-426 ◽  
pp. 443-447 ◽  
Author(s):  
Wen Wen Dou ◽  
Yu Chao Niu ◽  
Xiang Ju Liu ◽  
Xiao Li Wang ◽  
Yong Xu
Keyword(s):  
Contact Angle ◽  
Low Temperature ◽  
Water Contact Angle ◽  
Prolonged Exposure ◽  
Sol Gel ◽  
High Porosity ◽  
Antireflective Coatings ◽  
Water Contact ◽  
Static Water Contact Angle ◽  
Static Water

Antireflective coatings with stable hydrophobicity for solar tube were prepared via sol-gel method and hexamethyldisilazane (HMDS) treatment. The coatings have a high porosity, groove-like surface morphology and a big static water contact angle. As a result, the coatings exhibit high transmittance even in high humidity environments. The transmittance peak can reach up to 99.02% which increased by 7% compared with the substrate and the wavelength band increased by more than 5% is from 438nm to 1000nm. After prolonged exposure to strong ultraviolet (UV) irradiation, the static water contact angle of the HMDS treated antireflective coatings decreased very small from 102o to 98o. In addition, the low-temperature tests showed the contact angle did not decline even at-50°C. The results suggest that the coatings prepared in present paper have stable hydrophobic and antireflective performance in the environment of strong UV radiation and low temperature.

scholarly journals Surface treated cotton fabric with stain repellent property for the use in aircraft upholstery

2021 ◽  
Vol 16 ◽  
pp. 155892502110051
Author(s):  
Kuruppu Achchige Dulani Daminda Kuruppu
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Cotton Fabric ◽  
Textile Industry ◽  
Water Contact ◽  
Wrinkle Resistance ◽  
Static Water Contact Angle ◽  
Before And After ◽  
Static Water ◽  
Afm Micrographs

Nanotechnology modifications play a major role in textile industry due to extraordinary properties exhibit in fabrics due to nanomaterials. It offers different functionalities namely self-cleaning, wrinkle resistance, flame retardancy, protection from UV radiations or antibacterial property. Further, it is important to maintain cleanliness in aircraft upholstery always but the airliners have to bear a considerable amount of money to clean up the aircraft upholstery. Interestingly, nanotechnology can provide stain repellence property for fabrics in aircraft upholstery. This study covers a method of developing a stain repellent fabric which was stable even after 25 standard laundering conditions. In this study nanotechnology was used to modify a cotton fabric with stain repellant property. After nanotechnology modification, the surface wettability of the treated fabrics was characterized by static water contact angle measurements before and after 25 washes carried out under standard laundering conditions. Similar testings were carried out for the untreated fabric samples. The static water contact angle for the treated fabric was 161° with the recovery of 97.5% after 25 washing cycles. SEM and AFM micrographs were used to analyze the coatings. Further, the stability of hydrophobicity in the modified cotton fabric after 25 washes was also tested for tea, coffee, and water solutions which are vulnerable stain types in aircraft upholstery. It clearly proved that the modified cotton fabric even after 25 washes showed hydrophobicity for tea, coffee, and water. Therefore, it could be concluded that the developed modified cotton fabric can consider to be used as an aircraft upholstery.

scholarly journals Preparation and Characterization of a Novel Poly(vinylidene fluoride-co-hexafluoropropylene)/Poly(ethersulfone) Blend Membrane Fabricated Using an Innovative Method of Mixing Electrospinning and Phase Inversion

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 790
Author(s):  
Norhan Nady ◽  
Noha Salem ◽  
Sherif. H. Kandil
Keyword(s):  
Contact Angle ◽  
Water Vapor ◽  
Phase Inversion ◽  
Vinylidene Fluoride ◽  
Water Vapor Permeability ◽  
Vapor Permeability ◽  
Water Contact ◽  
Static Water Contact Angle ◽  
Poly Vinylidene Fluoride ◽  
Static Water

In this work, a novel polymeric membrane was innovated in terms of composition and preparation techniques. A blend of poly(vinylidene fluoride-co-hexafluoropropylene) (PcH) and poly(ethersulfone) (PES) (18 wt.% total polymer concentration) was prepared using a N-methylpyrrolidone (NMP) and N, N-Dimethylformamide (DMF) solvents mixture, while Lithium chloride (0.05–0.5 wt.%) was used as an additive. The electrospinning and phase inversion techniques were used together to obtain a novel membrane structure. The prepared membranes were characterized using scanning electron microscope imaging, energy dispersive X-Ray, differential scanning calorimeter, thermogravimetric analysis, and Fourier transfer infrared spectroscopy-attenuated total reflectance analyses. Moreover, the static water contact angle, membrane thickness, porosity, surface roughness as well as water vapor permeability were determined. ImageJ software was used to estimate the average fiber diameter. Additionally, the effect of the change of PcH concentration and coagulation bath temperature on the properties of the fabricated membrane was studied. The novel developed membrane has shown a good efficiency in terms of properties and features, as a membrane suitable for membrane distillation (MD); a high porosity (84.4% ± 0.6), hydrophobic surface (136.39° ± 3.1 static water contact angle), and a water vapor permeability of around 4.37 × 10−5 g·m/m2·day·Pa were obtained. The prepared membrane can be compared to the MD membranes commercially available in terms of properties and economic value.

Preparation of β-Cyclodextrin Modified Poly(d,l-Lactic Acid) and its Blood Compatibility

2011 ◽  
Vol 181-182 ◽  
pp. 429-433
Author(s):  
Jiu Jin Zhu ◽  
Xue Jun Quan ◽  
Yuan Liang Wang ◽  
Shu Shu Zou
Keyword(s):  
Contact Angle ◽  
Lactic Acid ◽  
Blood Compatibility ◽  
Blood Platelets ◽  
Acylating Agent ◽  
Acylation Reaction ◽  
Water Contact ◽  
Static Water Contact Angle ◽  
Static Water ◽  
Better Than

Aiming to develop a biomaterial with excellent biocompability, a novel β-cyclodextrin modified polylactic acid (PLA-β-CD) was synthesized by N-acylation reaction of MPLA (maleic anhydride modified poly(d,l-lactic acid)) using hydrophilic mono(6-(2-aminoethyl)-amino-6-deoxy)- β-cyclodextrin(β-CD-6-E) as acylating agent. Surface wettability and blood biocompatibility of PLA-β-CD were investigated. The tests indicated that the static water contact angle of PLA-β-CD was decreased from 76.7º to 72.1º comparing with PLA. The morphology of blood platelets adhered on the surface of PLA-β-CD was observed by scanning, and only a few platelets, round and not aggregated. The results revealed that the blood compatibility of PLA-β-CD was better than PLA.

Application Studies on Silane Hydrophobic Agents for Concrete Protection

2014 ◽  
Vol 1053 ◽  
pp. 297-302
Author(s):  
Ning Cai ◽  
Yao Xia Li ◽  
Da Xiang Cui
Keyword(s):  
Contact Angle ◽  
Protective Effect ◽  
Water Absorption ◽  
Hydrophobic Property ◽  
Water Contact ◽  
Static Water Contact Angle ◽  
Static Water ◽  
Hydrophobic Agent ◽  
Depth Water ◽  
Better Than

In this paper, the function of silane hydrophobic agents to protect concretes under different varieties and different concentrations were studied. Penetration depth, water absorption ratio and contact angle were measured and compared, the influences of silane hydrophobic agents on the concretes protection under different condition were investigated. Results showed that silane hydrophobic agents exhibit better properties on concretes protection. 24h water absorption ratios of all silane hydrophobic agents surpassed the trade standard JC/T 902-2002 Silicone hydrophobic agent for construction surfaces, and all of the samples showed excellent static water contact angle and hydrophobic property. The protective effect of silane hydrophobic agent B is better than silane hydrophobic agent A.

scholarly journals Preparation and Characterization of Chitosan/Poly(Vinyl Alcohol) Blended Films: Mechanical, Thermal and Surface Investigations

2011 ◽  
Vol 8 (1) ◽  
pp. 91-96 ◽  
Author(s):  
Esam A. El-Hefian ◽  
Mohamed Mahmoud Nasef ◽  
Abdul Hamid Yahaya
Keyword(s):  
Contact Angle ◽  
Poly Vinyl Alcohol ◽  
Scanning Calorimetry ◽  
Water Contact ◽  
Elongation At Break ◽  
Angle Measurements ◽  
Static Water Contact Angle ◽  
Contact Angle Measurements ◽  
Static Water

In this study, blends of chitosan (CS) and polyvinyl alcohol (PVA) (CS/PVA) having various proportions were prepared and characterized by universal mechanical tester, the differential scanning calorimetry (DSC) and contact angle measurements. Studying the mechanical properties of the films showed that blending improved the tensile strength, which increased with increasing PVA content up to 40% while the elongation% at break of the blends was decreased compared to that of the pure components. The obtained results of DSC suggested that some interaction between chitosan and PVA mostly took place. Static water contact angle measurements showed an improvement in the wettability of the obtained films.

Sign in / Sign up

Export Citation Format

Share Document