Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 30
·15855-15861
·
IF 8.867
Chao Liu,Chunfeng Ma,Qingyi Xie,Guangzhao Zhang
Marine biofouling is one of the most challenging problems today. Silicone polymer based coatings with a low surface energy and elastic modulus can effectively inhibit or release biofouling. However, their non-repairable properties and poor antifouling ability under static conditions limit their applications. Here, we report a self-repairing coating consisting of poly(dimethylsiloxane) based polyurea (PDMS-PUa) and a small amount of organic antifoulant (4,5-dichloro-2-n-octyl-4-isothiazolin-3-one) (DCOIT). The coating can completely recover its mechanical properties after damage either in air or artificial seawater at room temperature. Such recovery can be accelerated at a higher temperature. Moreover, the release rate of DCOIT is almost constant and can be regulated by its concentration. Six-month marine field tests demonstrate that the system has a good antifouling/fouling release performance even under static conditions.
研究领域:
海洋生物学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Guangling He,Shuqing Wei,Yuhao Yue,Lei Dong,Liangmin Yu
Hydrogel is recognized as highly promising antifouling coatings. The introduction of other antifouling strategies has emerged as an essential research direction for enhancing hydrogel antifouling applications. However, simultaneous integration of multiple antifouling strategies within the same hydrogel remains challenging, while attenuation of hydrogel hydration layer antifouling effect during functionalization is still problematic. Herein, a multifunctional coating combines the hydrogel hydration layer surface with multiple antifouling mechanisms including low surface energy characteristics, cationic contact-killing structure, and fluorescence performance was developed. Through elevation of 2-(dimethylamino)ethyl methacrylate (DM) content, the hydration layer characteristics, low surface energy characteristics, cationic contact-killing effect, and fluorescence performance were simultaneously enhanced. This approach effectively overcomes antagonistic interactions between co-existing multiple antifouling mechanisms. Crucially, the fluorescence functionality was engineered in this coating without employing exogenous fluorophores through precisely designed intermolecular aggregation. Meanwhile, an enhanced dual-stage defense was imparted to the coatings through synergistic mechanism integration. First stage of antifouling defense: hydration layer, low surface energy, and fluorescence performance collectively impart enhanced fouling-resistance adhesion capability into coating. Second stage of antifouling defense: surface-adhered organisms are killed via contact-killing. Consequently, the hydrogel demonstrates excellent anti-protein adsorption performance (minimum normalized value <1 %), algal adhesion and growth inhibition performance, inhibition of bacterial growth (up to 98.27 %) and adhesion performance (up to 96.36 %). It employs absolutely no metallic antifouling agents and fluorescent agents, thereby providing important insights for eco-friendly marine antifouling coatings.
研究领域:
材料科学
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高分子化学
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表面工程
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海洋生物污损防治
·
环境友好材料
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功能涂层
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Shilong Zhang,Shuyang Tan,Yajun Deng,Bo Wu,Yanling Yang,Jiangfan Chang,Xianhui Zhang,Baiyi Chen,Jianhua Wu
Traditional antifouling coatings often lack the combined capabilities of static antifouling and dynamic fouling-release, which are critical for marine propellers. This study addresses this limitation by developing pH-sensitive polysiloxane coatings that integrate both functionalities. Two coating systems, PS-Levo and PS-PLL, were synthesized by incorporating levofloxacin (Levo) and polylysine (PLL) as antifouling agents, respectively. PS-Levo was synthesized via an epoxy-carboxylic acid ring-opening reaction, while PS-PLL was obtained through an amine-hydrosilylation reaction, using APTES as the curing agent. A key innovation of these coatings is their pH-triggered hydrolysis. Marine microorganisms that form biofilms on the coating surface can alter the microenvironmental pH through their metabolic activities, either lowering or raising it, thereby promoting the release of antifouling agents. The coatings exhibited remarkable antifouling efficacy, achieving bactericidal and anti-algal rates of over 99% and 97%, respectively. Following a 180-day immersion of the coated panels in natural seawater, minimal marine biofouling adhered to the coated surfaces and could be effortlessly removed by simple rinsing, thereby demonstrating excellent static antifouling and dynamic fouling-release performance. Moreover, the PS-Levo and PS-PLL coatings exhibited outstanding adhesion, mechanical properties, and corrosion resistance. This research introduces an innovative strategy for combating biofouling on marine propellers and presents significant potential for practical applications in the marine antifouling industry.
研究领域:
海洋科学
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材料科学
·
表面工程
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环境化学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
METABOLIC ENGINEERING
·
2023
·
IF 8.4
Peichao Zhang,Jing Gao,Haiyang Zhang,Yongzhen Wang,Zhen Liu,Sang Yup Lee,Xiangzhao Mao
Zosteric acid (ZA) is a Zostera species-derived, sulfated phenolic acid compound with antifouling activity and has gained much attention due to its nontoxic and biodegradable characteristics. However, the yield of Zostera species available for ZA extraction is limited by natural factors, such as season, latitude, light, and temperature. Here we report the development of metabolically engineered Escherichia coli strains capable of producing ZA from glucose and glycerol. First, intracellular availability of the sulfur donor 3′-phosphoadenosine-5′-phosphosulfate (PAPS) was enhanced by knocking out the cysH gene responsible for PAPS consumption and overexpressing the genes required for PAPS biosynthesis . Co-overexpression of the genes encoding tyrosine ammonia-lyase, sulfotransferase 1A1, ATP sulfurylase, and adenosine 5′-phosphosulfate kinase constructed ZA producing strain with enhanced PAPS supply. Second, the feedback-resistant forms of aroG and tyrA genes (encoding 3-deoxy- d -arabinoheptulosonate 7-phosphate synthase and chorismate mutase , respectively) were overexpressed to relieve the feedback regulation of L- tyrosine biosynthesis. Third, the pykA gene involved in phosphoenolpyruvate-consuming reaction, the regulator gene tyrR , the competing pathway gene pheA , and the ptsHIcrr genes essential for the PEP:carbohydrate phosphotransferase system were deleted. Moreover, all genes involved in the shikimate pathway and the talA , tktA , and tktB genes in the pentose phosphate pathway were examined for ZA production. The PTS-independent glucose uptake system, the expression vector system, and the carbon source were also optimized. As a result, the best-performing strain successfully produced 1.52 g L −1 ZA and 1.30 g L −1 p -hydroxycinnamic acid from glucose and glycerol in a 700 mL fed-batch bioreactor .
研究领域:
生物技术
·
微生物学
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代谢工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Abid Ali,Yue Xiao,Lina Song,Jiankun Hu,Qingqing Rao,Muhammad Shoaib,Bilal Ul Amin,Xiaoli Zhan,Qinghua Zhang
The colonization of tiny marine organisms on ship's hull which are connected directly from seawater , is a costly issue. Biofouling contributes to enhanced hydrodynamic drag, which leads to higher consumption of fuel and greenhouse gas emissions . Therefore, the environment-friendly solution is very necessary for anti-biofouling activity. For this purpose, we have synthesized biodegradable polyurethane (CL-PU) composed of ε-CL and 4,4′-methylenebis(cyclohexyl isocyanate) (H 12 MDI) and 1,4 butanediol (1,4 BD). The synthesized CL-PU was further modified with 4, 5-dicholoro-2-octyl-isothiazolone (DCOIT) and clay by mixing of the solution to make composites. Our study showed that CL-PU/DCOIT/clay composite degraded in the artificial seawater (ASW), enzymatic solution and seawater (through laboratory test) due to the contents of clay. Because the existence of clay reduced the size of the spherulite of polycaprolactone (PCL) in the composite, therefore remarkably improved the crystallinity as determined via the polarizing optical microscope (POM) and differential scanning calorimetry (DSC). The composite acted as carrier of antifoulant (DCOIT) and controlled their release rate. The anti-bacterial and anti-diatom experiments exhibited that the composite with DCOIT contents were effective in preventing the accretion of Escherichia coli ( E.coli) (region inhibition 14 mm) and marine diatom Navicula incerta (82.5% reduction). The degradable CL-PU/DCOIT/clay composite will have tremendous durability and excellent anti-fouling activity for marine biofouling owning to sustainability and tunability without being toxic to aquatic biota.
研究领域:
材料科学
·
海洋生物学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）