scholarly journals Development of Marine Antifouling Epoxy Coating Enhanced with Clay Nanotubes

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4195 ◽  
Author(s):  
Ye Fu ◽  
Wencai Wang ◽  
Liqun Zhang ◽  
Vladimir Vinokurov ◽  
Anna Stavitskaya ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Sea Water ◽  
Field Tests ◽  
Halloysite Nanotubes ◽  
Epoxy Coating ◽  
Release Time ◽  
Marine Microorganisms ◽  
Water Test ◽  
Natural Mixture ◽  
Clay Nanotubes

An antifouling epoxy resin doped with natural clay nanotubes that are loaded with biocide or silver allowed extended protection against the proliferation of marine microorganisms. Compared to the 2–3 months of protection with antifoulant dichlorooctylisothiazolone (DCOIT) directly admixed into epoxy resin, the DCOIT release time of the halloysite formulations was extended to 12 months by incorporating biocide-loaded nanoclay in the polymer matrix. The protective properties of the epoxy-halloysite nanocomposites showed much less adhesion and proliferation of marine bacteria Vibrio natriegens on the resin surface after a two-month exposure to seawater than the coating formulations directly doped with non-encapsulated DCOIT. The coating formulation protection efficiency was further confirmed by twelve-month shallow field tests in the South China Sea. Replacing 2 wt.% biocide in the traditional formula with DCOIT-loaded natural environmentally friendly halloysite clay drastically improved the antifouling properties of the epoxy coating, promising scalable applications in protective marine coating. The antifouling property of epoxy resin was enhanced with silver particles synthesized on halloysite nanotubes. A natural mixture of MnO particles and halloysite could also be used as a nonbiocide additive to marine coating. The short-term White Sea water test of epoxy coating with 5% of Ag-halloysite composite of MnO-halloysite natural mixture showed no visible fouling.

scholarly journals Release kinetics study and anti-corrosion behaviour of a pH-responsive ionic liquid-loaded halloysite nanotube-doped epoxy coating

RSC Advances ◽  
2020 ◽  
Vol 10 (22) ◽  
pp. 13174-13184 ◽  
Author(s):  
Yap Jen Yang ◽  
Sarini Mat Yaakob ◽  
Nurul Ekmi Rabat ◽  
Muhammad Rashid Shamsuddin ◽  
Zakaria Man
Keyword(s):  
Corrosion Resistance ◽  
Ionic Liquid ◽  
Epoxy Resin ◽  
Corrosion Behaviour ◽  
Release Kinetics ◽  
Halloysite Nanotubes ◽  
Epoxy Coating ◽  
Kinetics Study ◽  
Ph Responsive ◽  
Halloysite Nanotube

Enhanced corrosion resistance was obtained for steel coated with epoxy resin doped with pH-responsive halloysite nanotubes loaded with ionic liquid.

Magnetic halloysite nanotubes for yeast cell surface engineering

Clay Minerals ◽  
2016 ◽  
Vol 51 (3) ◽  
pp. 429-433 ◽  
Author(s):  
S.A. Konnova ◽  
Y.M. Lvov ◽  
R.F. Fakhrullin
Keyword(s):  
Surface Engineering ◽  
Halloysite Nanotubes ◽  
Yeast Cells ◽  
Biological Cells ◽  
Intrinsic Properties ◽  
Cell Surface Engineering ◽  
Yeast Cell Surface ◽  
Clay Nanotubes ◽  
Field Manipulation ◽  
Tube Shell

AbstractHalloysite clay nanotubes are safe and biocompatible nanomaterials and their application in biomaterials is very promising. The microencapsulation of yeast cells in the shell of clay nanotubes modifying their properties was demonstrated here. Each cell was coated with a 200–300 nm-thick tube shell and this coating was not harmful for these cells’ reproduction. Synthesis of magnetic nanoparticles on the surfaces of the nanotubes allowed for magnetic-field manipulation of the coated cells, including their separation. Providing nano-designed shells for biological cells is a step forward in development of ‘cyborg’ microorganisms combining their intrinsic properties with functions added through nano-engineering.

scholarly journals Starch-Jute fiber hybrid biocomposite modified with Epoxy resin layer: Fabrication and Experimental Characterization

2018 ◽  
Author(s):  
Akarsh Verma ◽  
Kamal Joshi ◽  
Amit Gaur ◽  
V. K. Singh
Keyword(s):  
Tensile Strength ◽  
Water Absorption ◽  
Epoxy Resin ◽  
High Water ◽  
Epoxy Coating ◽  
Jute Fiber ◽  
Compression Moulding ◽  
Resin Layer ◽  
Major Disadvantage ◽  
Water Absorption Property

In this article, bio-composites derived from starch-glycerol biodegradable matrix reinforced with jute fibers have been fabricated using the wet hand lay-up and compression moulding techniques. Samples having different weight percentages of jute fiber in the starch matrix have been analysed. The fibers surface was chemically treated by alkaline sodium hydroxide for improving the interphase bonding between fiber and matrix. Tensile test for the composites were done and the sample with highest tensile strength was selected for further tests that included water absorption, scanning electron microscopy and thermal analysis. It has been concluded that the ultimate tensile strength was found to be maximum for the composition of 15% fiber by weight composite as 7.547 MPa without epoxy coating and 10.43 MPa with epoxy coating. The major disadvantage of bio-composite is its high water absorption property, which in this study has been inhibited by the epoxy resin layer. Herein, the results of various tests done disclose a noteworthy improvement in the overall properties of bio-composite, in comparison to the neat biodegradable starch matrix.

Marine Biosurfactants, III. Toxicity Testing with Marine Microorganisms and Comparison with Synthetic Surfactants

1991 ◽  
Vol 46 (3-4) ◽  
pp. 210-216 ◽  
Author(s):  
Knut Poremba ◽  
Wilfried Gunkel ◽  
Siegmund Lang ◽  
Fritz Wagner
Keyword(s):  
Marine Bacterium ◽  
Sea Water ◽  
Toxicity Testing ◽  
Test System ◽  
Marine Microorganisms ◽  
Oil Dispersants ◽  
Test Organisms ◽  
Pure Cultures ◽  
Microtox Test ◽  
Synthetic Surfactants

Eight synthetic and nine biogenetic surfactants were tested on their toxicity. Because of their possible application as oil dispersants against oil slicks on sea. the test organisms used were marine microorganisms (mixed and pure cultures of bacteria, microalgae, and protozoa). Bacterial growth was hardly effected or stimulated, whilst that of algae and flagellates was reduced. All substances tested were biodegradaded in sea water. The bioluminescence of Photobacter phosphoreum (Microtox test) was the most sensitive test system used. A ranking shows that most biogenetic surfactants were less toxic than synthetic surfactants. No toxicity could be detected with the glucose-lipid GL. produced by the marine bacterium Alcaligenes sp. MM 1.

Anticorrosion epoxy coating enriched with hybrid nanozinc dust and halloysite nanotubes

2013 ◽  
Vol 130 (2) ◽  
pp. 955-960 ◽  
Author(s):  
Nima Moazeni ◽  
Zurina Mohamad ◽  
Nor Liyana Izzati Faisal ◽  
Mahsa A. Tehrani ◽  
Nazila Dehbari
Keyword(s):  
Halloysite Nanotubes ◽  
Epoxy Coating

Antibacterial properties and in vivo studies of tannic acid-stabilized silver–halloysite nanomaterials

Clay Minerals ◽  
2020 ◽  
Vol 55 (2) ◽  
pp. 112-119
Author(s):  
Anna Stavitskaya ◽  
Christina Shakhbazova ◽  
Yulia Cherednichenko ◽  
Läysän Nigamatzyanova ◽  
Gölnur Fakhrullina ◽  
...  
Keyword(s):  
Tannic Acid ◽  
Antibacterial Properties ◽  
Halloysite Nanotubes ◽  
In Vivo Studies ◽  
Negative Effects ◽  
Antibacterial Performance ◽  
Synthesis Strategy ◽  
Clay Nanotubes

AbstractTannic acid-stabilized silver nanoparticles were synthesized in situ on halloysite clay nanotubes. The synthesis strategy included simple steps of tannic acid adsorption on clay nanotubes and further particle formation from silver salt solution. Pristine halloysite nanotubes as well as amino-modified clays were used for silver stabilization in water or ethanol. The materials were tested for antibacterial performance using three different methods. All of the materials produced showed antimicrobial activity. The pristine halloysite-based material with ~5 nm particles produced using ethanol as the solvent and tannic acid as the reducing agent showed the greatest antibacterial activity against Serratia marcescens. The materials were tested in vivo on Caenorhabditis elegans nematodes to ensure their safety, and they showed no negative effects on nematode growth and life expectancy.

scholarly journals Preparation of a Novel Epoxy/SiO2 Hybrid Coating

2005 ◽  
Vol 14 (1) ◽  
pp. 096369350501400 ◽  
Author(s):  
C. H. Zhang ◽  
Y. P. Bai ◽  
L. X. Liu ◽  
Z. Q. Zhang ◽  
Q. Y. Li
Keyword(s):  
Thermal Properties ◽  
Epoxy Resin ◽  
Sol Gel ◽  
Covalent Bond ◽  
Decomposition Temperature ◽  
Hybrid Coating ◽  
Epoxy Coating ◽  
Covalent Bonds ◽  
Surface Image ◽  
Gel Technique

In this paper, epoxy/SiO2 hybrid coating was successfully prepared through sol-gel technique, the structure and thermal properties of epoxy/SiO2hybrid coating were investigated. First, γ-isocyanatopropyltriethoxysilane “(KBE-9007)” was used to modify the epoxy resin so that the ethoxysilane could be grafted on the epoxy resin. Nano-SiO2 precursor was synthesized by tetraethoxysilane(TEOS) through sol-gel technique. Then the modified epoxy resin and the nano-SiO2 precursor were mixed for 4 hours to let the macromolecules of epoxy resin graft on the surface of nano-SiO2, and modified nano-SiO2 precursor was obtained. At last, epoxy/SiO2 hybrid coating was produced by using the modified nano-SiO2 precursor. The graft reaction was confirmed by the analyses of FT-IR. The analyses of XPS indicated that there are lots of SiO2 particles and Si-C covalent bonds on the surface of epoxy/SiO2 hybrid coating, they also suggested that most TEOS had changed into SiO2 particles and Si-C covalent bond had been formed between epoxy resin and SiO2. The analyses of SEM fracture surface image of epoxy/SiO2 hybrid coating showed that SiO2 particles dispersed in epoxy matrix homogeneously and the size of the particles was between 50nm and 100 nm. Thermoanalysis Instrument was employed to detect the thermal properties of epoxy coating and epoxy/SiO2 hybrid coating, the results indicated that the thermal decomposition temperature of epoxy/SiO2 hybrid coating is 21.7 °C higher than that of epoxy coating, the thermal properties of the epoxy/SiO2 hybrid coating were improved because of the introduction of nano-SiO2.

scholarly journals Fabrication of EPYR/GNP/MWCNT carbon-based composite materials for promoted epoxy coating performance

RSC Advances ◽  
2018 ◽  
Vol 8 (42) ◽  
pp. 23555-23566 ◽  
Author(s):  
Mahmoud A. Hussein ◽  
Bahaa M. Abu-Zied ◽  
Abdullah M. Asiri
Keyword(s):  
Composite Materials ◽  
Epoxy Resin ◽  
Epoxy Coating ◽  
Coating Performance ◽  
Casting Technique ◽  
Carbon Based

Composite materials containing epoxy resin and reinforced by mixed carbon-based nano-fillers (GNP/MWCNT) have been fabricated using the dissolution casting technique with the help of ultrasonic assistance for promoted epoxy coating performance.

ASSESSMENT OF THREE SURFACE COLLECTING AGENTS DURING TEMPERATE AND ARCTIC CONDITIONS

1985 ◽  
Vol 1985 (1) ◽  
pp. 199-201 ◽  
Author(s):  
Pamela Pope ◽  
Al Allen ◽  
William G. Nelson
Keyword(s):  
Oil Recovery ◽  
Sea Water ◽  
Field Tests ◽  
Ambient Air ◽  
Cold Weather ◽  
Test Tank ◽  
Air Temperatures ◽  
Collecting Agents ◽  
Before And After ◽  
Prudhoe Bay

ABSTRACT Laboratory and field tests were conducted to evaluate the effectiveness of using surface collecting agents in cold weather oil recovery and in situ burning operations. In a small laboratory test tank, the surface areas and equilibrium thicknesses of three Alaskan North Slope crude oils were observed before and after the application of three different surface collecting agents to each oil. Numerous small bench-top tests also were conducted to further support the observations made in the test tank. Ambient air temperatures were varied from 23° C to −17° C, while the temperatures of fresh water and laboratory-prepared sea water were varied from 15° C to 0° C. The three surface collecting agents used (Corexit OC-5, Nalco 3WP-086, Shell Oil Herder) were equally effective in concentrating the areas of thin films by as much as 95 percent within a minute or less. The efficiencies of the surface collecting agents were observed to decrease only slightly with air temperatures below 0° C. Equilibrium thicknesses and areas before and after collectant application were determined using standard photometric techniques. In addition, two field tests were conducted to evaluate the effectiveness of collecting agents on large experimental oil slicks in an onshore pit at Prudhoe Bay. In each test, approximately 1 m3 of fresh Prudhoe Bay crude oil was released and allowed to come to an equilibrium thickness. In each test, the oil was concentrated with Corexit OC-5 and Shell Oil Herder and then ignited. Winds of 4-to-6 knots (2-to-3 m/s) herded the slicks into one corner of the pit and produced an average slick thickness of 9.5 mm. The use of collectants resulted in a 5 percent reduction of the wind-herded slick areas, thus increasing the thicknesses to approximately 10 mm.

scholarly journals Recent Advances on Surface Modification of Halloysite Nanotubes for Multifunctional Applications

2017 ◽  
Author(s):  
Yongtao Yang ◽  
Yun Chen ◽  
Fan Leng ◽  
Li Huang ◽  
Zijian Wang ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Surface Modification ◽  
Surface Charge ◽  
Structural Characteristics ◽  
Halloysite Nanotubes ◽  
Future Prospects ◽  
Recent Advances ◽  
Application Potential ◽  
Surface Modified ◽  
Clay Nanotubes

Halloysite nanotubes (HNTs) are natural occurring mineral clay nanotubes that have excellent application potential in different fields. However, HNTs are heterogeneous in size, surface charge and formation of surfacial hydrogen bond, which lead to weak affinity and aggregation at a certain extent. It is very important to modify the HNTs’ surface to expand its applications. In this review, the structural characteristics, performance and the related applications of surface-modified HNTs are reviewed. We focus on the surface-modified variation of HNTs, the effects of surface modification on the materials and related applications in various regions. In addition, future prospects and the meaning of surface modification were also discussed in HNTs studies. This review provides a reference for the application of HNTs modifications in the field of new nanomaterials.

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