In Situ Assembly of Antifouling/Bacterial Silver Nanoparticle-Hydrogel Composites with Controlled Particle Release and Matrix Softening

Baek, Kwanghyun,Liang, Jing,Lim, Wan Ting,Zhao, Huimin,Kim, Dong Hyun,Kong, Hyunjoon American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.28

<P>Controlling bacterial contamination has been a major challenge for protecting human health and welfare. In this context, hydrogels loaded with silver nanoparticles have been used to prevent biofilm formation on substrates of interest. However, such gel composites are often plagued by rapid loss of silver nanoparticles and matrix softening, and thus the gel becomes less effective for antifouling. To this end, this study demonstrates that in situ photoreaction of an aqueous mixture of silver nitrates, poly(ethylene glycol) diacrylate, and vinylpyrrolidone results in a silver nanoparticle-laden hydrogel composite with minimal nanoparticle loss and matrix softening due to enhanced binding between nanoparticles and the gel. The resulting gel composite successfully inhibits the bacterial growth in media and the bacterial adhesion to surfaces of interest. We suggest that the results of this study serve to advance quality of materials with antifouling/bacterial activities.</P><P>An advanced, antifouling/bacterial hydrogel composite is structurally stable and sustainably sequesters encapsulated silver nanoparticles. The material can prevent biofilm formation on various plastic and metallic materials even with 10-fold lower silver content than that typically used in past studies.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-28/acsami.5b03313/production/images/medium/am-2015-033138_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b03313'>ACS Electronic Supporting Info</A></P>

BiOI/BiVO4 p–n heterojunction with enhanced photocatalytic activity under visible-light irradiation

Zhenbo Xiang,Yi Wang,Dun Zhang,Peng Ju 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.40 No.-

A novel visible-light-sensitive BiOI/BiVO4 photocatalyst with a p–n heterojunction structure wassynthesized through a facile coprecipitation method. The physical and chemical properties of assynthesizedBiOI/BiVO4 composites were characterized by XRD, XPS, BET, SEM, EDS, HRTEM,photoluminescence spectrum and UV–DRS respectively. The photocatalytic activity of the preparedphotocatalysts was evaluated by photodegrading methylene blue and killing of Pseudomonas aeruginosa(P. aeruginosa) under visible light irradiation. The results showed that the 30%BiOI/BiVO4 (molar ratio ofI:V = 3:7) exhibits the higher photocatalytic activity than the pristine BiOI and BiVO4. Moreover, thesterilization mechanism involved in the photocatalytic disinfection process was studied by captivespecies trapping experiments. The result revealed that hydroxyl radical ( OH) and holes (h+) are the mainreactive species for killing of P. aeruginosa under visible light irradiation. In addition, after five recyclesfor killing of P. aeruginosa under visible light irradiation, 30%BiOI/BiVO4 does not exhibit significant lossof photocatalytic activity. The results confirm that the synthesized 30%BiOI/BiVO4 photocatalyst haslong-time reusability and good photocatalytic stability. The photocatalyst shows potential application inmarine antifouling.

Review on thin-film nanocomposite membranes with various quantum dots for water treatments

Andrew Kim,문승재,김종학,라즈쿠마파텔 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-

This review addresses water treatment using thin-film nanocomposite (TFN) membranes incorporatedwith various quantum dots (QDs), focusing heavily on dye removal and membrane antifouling. QDsare zero-dimensional nanomaterials that have been incorporated into the selective layer or support layerof nanofiltration (NF) membranes to increase membrane permeance while retaining high selectivity. Various preparation methods, including interfacial polymerization (IP), nonsolvent-induced phase separation(NIPS), vacuum filtration, layer-by-layer (LbL), and spin coating, are discussed with their advantagesand disadvantages. Carbon-based QDs, including graphene quantum dots (GQDs), graphene oxidequantum dots (GOQDs), and carbon quantum dots (CQDs), have high hydrophilicity and excellent functionalizability,which enable fine control over porosity, thickness, repulsiveness, wettability, and foulingresistance. The low dimensionality of QDs also endows membranes with excellent anti-biofouling propertiesthrough oxidative stress and abundant edge contacts at the liquid/membrane interface. Somecarbon-based QDs and metal QDs also enable photocatalytic dye degradation for enhanced waterpurification.

Superior Antifouling Properties of Bioinspired Ambivalent Block Copolyethers

임찬웅,김병수,이동욱 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-

PEG has attracted significant interest because of its excellent antifouling properties and high solubility and biocompatibility. However, the translation of its antifouling properties onto target surfaces has been challenging due to its limited functionality. Herein, we studied the antifouling properties of loop-like triblock copolyethers functionalized with catechol, a mussel-inspired, versatile moiety for coating, exclusively within a framework of polyethers. A series of catechol-functionalized polyethers with diverse molecular weights and catechol contents were synthesized via anionic ring-opening polymerization in a controlled manner. The versatile adsorption and antifouling effects of ambivalent block copolyethers were evaluated using a QCM-D. Furthermore, the crucial effects of the topology in the antifouling properties was analyzed via an SFA and MD simulations. This result demonstrates the catechol-functionalized triblock copolymer shows excellent antifouling properties.

Preparation and antifouling performance of PVDF-DCOIT composite hollow fiber membranes

Sen Qiao,Hongjie Cao,Yue Yang,Ruofei Jin,Jiti Zhou 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.3

Membrane fouling is the main bottleneck that hinders the applications of membrane bioreactors (MBRs). 4,5-Dichloro-2-n-octyl-4-isothiazolin-3-one (DCOIT), as an environmentally-acceptable antifouling biocide, was mixed with Polyvinylidene fluoride (PVDF) to fabricate hollow fiber membrane via non-solvent induced phase separation (NIPS), which was able to effectively improve the antifouling performance of the membranes in this work. Overall research of the prepared membrane revealed that membranes with 3 wt% DCOIT exhibited the optimum antifouling performance. With the addition of DCOIT, hydrophilicity and pure water flux of 3 wt% DCOIT membranes maintained remarkable improvement by 22.9% and 64.6% than that of membranes without DCOIT. Meanwhile, the surface morphologies of 3wt% DCOIT membranes were smoother than the control group in terms of SEM and AFM images, which was beneficial to alleviate membrane fouling. In antifouling experiments, the flux variation rate of membranes with 3 wt% DCOIT filtrated in bull serum albumin, sodium alginate and humic acid solution were 81.42%, 54.25%, 50.5%, while membrane without DCOIT were 64.6%, 24.72% and 29%, respectively. Similar results were obtained by filtrating anaerobic sludge for 24 h. The flux variations of 3 wt% DCOIT membranes were 59.4%, 47.8% and 46.0%, respectively in three stages. However, the flux variations of membranes without DCOIT were 44.8%, 36.7% and 19.8%, respectively, which showed better antifouling ability and higher flux recovery efficiency. The novel membranes would provide some theoretical basis and technical support for the rational combinations in elevating the overall antifouling properties of membranes.

Development and Evaluation of Self-polishing Copolymer (SPC) resins and antifouling paints based on silyl acrylate

박라희,박현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0

Silyl acrylate which are used in the development of environmentally friendly antifouling paints, can give the coatings self-smoothing properties. However, it has a low erosion rate in a static environment. Firstly, we synthesized the Si-SPC resins using other acrylate monomers to determine the effect of monomers on silyl acrylate. Secondly, we synthesized Si-SPC resins and analyzed the characteristics of resins using Taguchi method to improve the hardness and polishing ability. Thirdly, we developed antifouling paints using 4 type resins including the optimum condition of monomers obtained by Taguchi method. As a result of the image analysis, PSM-T7P and T8P showed a fouling area of 31.55 and 33.37%, which is similar to the Zn-based commercial paint. Through this, the antifouling performance of the Si-based antifouling paint was confirmed. ^** This word was supported by the National Research Foundation of Korea grant funded by the Korea government (MSIP) through GCRC-SOP(No.2011-0030013)

Preparation of zwitterionic polymer with water soluble PVA/chitosan for antifouling film

이동욱,이남규,최승용,문명준,손민영 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0

Marine biofouling is the unwanted growth and accumulation of biological organisms on materials submerged in seawater. Antifouling (AF) coating begins to fight biofouling since break into the sea threat posed by fouling marine organisms. In this study, preparation of ecofriendly antifouling film with water soluble contents, which is polyvinyl alcohol, chitosan, cellulose and zwitterionic polymer. FT-IR characterized show the contain the zwitterionic polymer, it also confirmed through X-ray photoelectron spectroscopy. Antifouling performance test accomplished with Escherichia coli and algae. Also, foul-release test was conducted to high-speed water circulation bath.

화상 분석을 통한 선박 방오도료의 성능 평가

박현(Hyun Park),전호환(Ho Hwan Chun),이인원(Inwon Lee) 한국가시화정보학회 2013 한국가시화정보학회지 Vol.11 No.2

An accurate and reliable performance evaluation technique is indispensable for the development of marine antifouling coatings. The existing standard practice is however, based on the visual observation of biofouling settlement area, which is prone to the subjective judgment of the inspector. In spite of the above mentioned importance, a systematic and objective fouling evaluation technique has not yet been introduced. In this study, a novel quantitative antifouling performance evaluation method for marine antifouling paints is devised based on the image analysis of panel immersion test results. The present image analysis method is to quantify settlement area for each fouling category by distinctive color. The fouling categories are set as unfouled, biofilm, green algae, brown algae, calcareous animal and spongy animal with specific HSL (Hue, Saturation, Lightness) color ranges. In order to assess the effectiveness of the proposed method, static immersion tests for three antifouling coatings were undertaken for two years.

Antifouling and Removal Efficiency of Foul‐Release Polydimethylsiloxane‐based Coatings: Lab‐Scale and Seawater Immersion Fouling Test and Hydrodynamic Shearing Test

Lee Donguk,Choi Seungyong,Moon Myungjun,Shon Minyoung 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.4

Antifouling is necessary to prevent the fouling of marine organisms on ship surfaces in seawater. Foul release (FR) coatings are considered an alternative to commercial antifouling coatings as eco-friendly coating materials that can prevent toxic biocide emissions. However, the evaluation of FR coatings for antifouling is extremely complicated owing to their foul-releasing mechanism with diverse surface properties. Therefore, a reliable laboratory simulation of the actual seawater immersion condition is required. Silicon-based FR coatings with several additives were prepared to evaluate the reliability of a laboratory fouling test. To simulate the marine foulant removal efficiency of an FR coating surface based on the ship speed, a circulating seawater channel was applied. Laboratory test showed a similar tendency as the seawater immersion. From the results, laboratory-scale microalgae fouling tests and circulating seawater channel tests are considered suitable for evaluating the antifouling performance of FR coatings.

Antifouling Activity towards Mussel by Small-Molecule Compounds from a Strain of Vibrio alginolyticus Bacterium Associated with Sea Anemone Haliplanella sp.

( Xiang Wang ),( Yanqiu Huang ),( Yanqing Sheng ),( Pei Su ),( Yan Qiu ),( Caihuan Ke ),( Danqing Feng ) 한국미생물 · 생명공학회 2017 Journal of microbiology and biotechnology Vol.27 No.3

Mussels are major fouling organisms causing serious technical and economic problems. In this study, antifouling activity towards mussel was found in three compounds isolated from a marine bacterium associated with the sea anemone Haliplanella sp. This bacterial strain, called PE2, was identified as Vibrio alginolyticus using morphology, biochemical tests, and phylogenetic analysis based on sequences of 16S rRNA and four housekeeping genes (rpoD, gyrB, rctB, and toxR). Three small-molecule compounds (indole, 3-formylindole, and cyclo (Pro-Leu)) were purified from the ethyl acetate extract of V. alginolyticus PE2 using column chromatography techniques. They all significantly inhibited byssal thread production of the green mussel Perna viridis, with EC₅₀ values of 24.45 μg/ml for indole, 50.07 μg/ml for 3-formylindole, and 49.24 μg/ml for cyclo (Pro-Leu). Previous research on the antifouling activity of metabolites from marine bacteria towards mussels is scarce. Indole, 3-formylindole and cyclo (Pro-Leu) also exhibited antifouling activity against settlement of the barnacle Balanus albicostatus (EC₅₀ values of 8.84, 0.43, and 11.35 μg/ml, respectively) and the marine bacterium Pseudomonas sp. (EC₅₀ values of 42.68, 69.68, and 39.05 μg/ml, respectively). These results suggested that the three compounds are potentially useful for environmentally friendly mussel control and/or the development of new antifouling additives that are effective against several biofoulers.