Quaternary Ammonium “Tannate” for Antifouling Coatings

Bellotti, Natalia; Amo, B. del; Romagnoli, Roberto

doi:10.1021/ie301524r

Cited by 19 publications

(21 citation statements)

References 29 publications

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“…Indeed, we observed that the addition of small amounts of ammonia to TA in ethanol leads to precipitation, likely due to the formation of ammonium tannate. 43 We found that with TEOS as precursor under these conditions, nonporous silica particles are formed. On the other hand, when large amounts of ammonia are added to TA in ethanol, a red solution is formed.…”

Section: ■ Results and Discussionmentioning

confidence: 79%

Large Pore Mesoporous Silica Nanoparticles by Templating with a Nonsurfactant Molecule, Tannic Acid

2014

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We describe a one-pot synthesis of novel large-pore mesoporous silica nanoparticles using a nonsurfactant template, tannic acid, and protein immobilization on these particles. The tannic-acid-templated mesoporous silica nanoparticles (TA-MSNPs) possess tunable large pores (6−13 nm), unique pore morphology, and a uniform diameter of ca. 200 nm. TA-MSNPs show high protein adsorption capacity of 77.1 mg/g for lysozyme, 396.5 mg/g for bovine hemoglobin, and 130.0 mg/g for bovine serum albumin and rapid protein uptake. They can also adsorb a large amount of m-MDH (421 ± 13 mg/ g) and protect this enzyme from the environment, as demonstrated by its high activity when encapsulated inside the mesopores of TA-MSNPs. ■. INTRODUCTIONMesoporous silica nanoparticles (MSNPs) attract increasing attention because of their high surface area, hydrophilic and easily functionalized surface, and biocompatibility. These properties are of high interest for a host of applications, 1,2 including drug delivery, 3 imaging, 4−6 catalysis, 7,8 and sensing. 9 To fulfill this promise, especially in the biomedical area, monodisperse MSNPs with sizes in the 50−200 nm range (to facilitate cell uptake 10,11 ) and with large mesopores (to allow for the encapsulation of biomacromolecules) are desired. In addition, accessible internal volume resulting from interconnected pores would be beneficial for these applications. 12,13 Numerous strategies for the preparation of MSNPs have been developed 14 using templating agents, usually surfactants. 15 Ionic surfactants, such as cetyltrimethylammonium bromide (CTAB), self-assemble into micelles, which create the voids in the silica matrix during the preparation of mesoporous silica materials, such as MCM-41. The formation of the mesoporous structure of MCM-41 is mainly due to the electrostatic interactions between the ionic surfactant and silicate species. 15 For nonionic surfactants, such as triblock copolymers, the hydrogen bonding between the surfactants and the silicate is believed to be the main driving force in the formation of mesoporous silica materials, such as SBA-15. 15 Fluorocarbon surfactants were also used to synthesize mesoporous silica with improved stability and novel mesostructures. 16 In all these cases, templating surfactant agents lead to ordered structures with noninterconnected cylindrical pores. 15 Several synthetic protocols for MSNPs with particle diameter and pore size controlled by using various surfactants and swelling agents have been reported. 12−19 For example, MCM-41 nanoparticles can be prepared with diameters in the 30−280 nm range; 20 however, the maximum pore size is limited to ca. 6 nm. SBA-15 nanoparticles 21 contain mesopores of larger sizes, controlled by triblock-copolymer templates, cosolvents, and swelling agents in the range of 6 to 50 nm. However, the size of the smallest SBA-15 particles reported so far is around 500 nm. 5,22 It remains a challenge to produce uniform MSNPs with diameters smaller than 200 nm and pore size larger than 10 nm in a simple synthetic p...

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Section: ■ Results and Discussionmentioning

confidence: 79%

Large Pore Mesoporous Silica Nanoparticles by Templating with a Nonsurfactant Molecule, Tannic Acid

2014

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“…We suggest that these are likely to include invasive organisms in a mechanism similar to transport on the hulls of ships. [22,23] Perhaps other consequences associated with these anthropogenic plastic particles await discovery.…”

Section: Discussionmentioning

confidence: 99%

Characterisation of microplastics and toxic chemicals extracted from microplastic samples from the North Pacific Gyre

2015

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Environmental context. Microplastics are a new source of toxic compounds in marine and freshwater environments. This research documents the discovery of microplastic fibres in the seawater column and the chemical analysis of associated toxic chemicals in microplastic marine debris. Microplastic pollution is pervasive and hazardous.Abstract. Initial studies of floating plastic debris in the oceans dealt with macroscopic particles. This research found microscale plastic present as well. Chemical analysis of sorbed materials revealed toxic materials associated with the microparticles. Seawater and plastic fragment samples were collected in September 2007 in the North Pacific Central Gyre. Polycyclic aromatic hydrocarbons and polychlorinated biphenyls (PCBs) were detected by mass spectrometry in extracts from the plastic fragments. Net concentrations of PCBs ranged from 1 to 223 ng g À1 plastic. The most common synthetic polymers were found to be polypropylene and polyethylene. Microscopic plastic fibres and particles were also discovered in the seawater samples and examined by scanning electron microscopy. Analysis of filtered seawater samples also revealed toxic materials in concentrations lower than found on the plastic particles.

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“…Products obtained from plants stand out like polyphenolic and terpenic compounds. In the case of polyphenolic compounds, this has been applied mostly in antifouling and anticorrosive paint formulations with promising results [111,112]. Essential oils are widely studied because of their antibacterial and antifungal activity to be applied to surface treatments by thin layers; some examples of this are those obtained from anise, garlic, cinnamon, oregano, and clove essential oils [113e116].…”

Section: Inorganic and Organic Compounds With Antimicrobial Potentialities To Coatingsmentioning

confidence: 99%

Waterborne functional paints to control biodeterioration

Bellotti

Deyá

Zarras³

et al. 2020

Handbook of Waterborne Coatings

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Quaternary Ammonium “Tannate” for Antifouling Coatings

Cited by 19 publications

References 29 publications

Large Pore Mesoporous Silica Nanoparticles by Templating with a Nonsurfactant Molecule, Tannic Acid

Large Pore Mesoporous Silica Nanoparticles by Templating with a Nonsurfactant Molecule, Tannic Acid

Characterisation of microplastics and toxic chemicals extracted from microplastic samples from the North Pacific Gyre

Waterborne functional paints to control biodeterioration

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