Synthesis of pyridinium polysiloxane for antibacterial coating in supercritical carbon dioxide

Chen, Yong; Han, Qiuxia; Wang, Yali; Zhang, Qiang; Qiao, Xuxu

doi:10.1002/app.41723

Cited by 28 publications

(18 citation statements)

References 42 publications

(62 reference statements)

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“…Mineral phases of precipitates at various Mg/Ca ratios and the weight percent were analyzed using MDI Jade (Version 6.5, MDI Materials Data, Inc., Livermore, CA, USA) and Material Studio software (Version 8.0, Accelrys, San Diego, CA, USA). The morphologies and elemental composition of precipitates were analyzed using SEM (S4800, Hitachi, Tokyo, Japan) [39][40][41][42][43][44][45] and EDS (EDAX XM2-60S, Hitachi, Tokyo, Japan). The precipitates were also analyzed with Fourier transform infrared spectroscopy (FTIR, Nicolet 380, Thermol Electron Corporation, Waltham, MA, USA) [46][47][48] in the 4000-500 cm −1 wavenumber range.…”

Section: Characteristics Of Minerals Induced By C Freundii Zw123mentioning

confidence: 99%

Bio-Precipitation of Carbonate and Phosphate Minerals Induced by the Bacterium Citrobacter freundii ZW123 in an Anaerobic Environment

Sun

Zhao

et al. 2020

Minerals

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In this study, a facultative anaerobic strain isolated from marine sediments and identified as Citrobacter freundii, was used to induce the precipitation of carbonate and phosphate minerals in the laboratory under anaerobic conditions. This is the first time that the ability of C. freundii ZW123 to precipitate carbonate and phosphate minerals has been demonstrated. During the experiments, carbonic anhydrase, alkaline phosphatase and ammonium released by the bacteria not only promoted an increase in pH, but also drove the supersaturation and precipitation of carbonate and phosphate minerals. The predominant bio-mediated minerals precipitated at various Mg/Ca molar ratios were calcite, vaterite, Mg-rich calcite, monohydrocalcite and struvite. A preferred orientation towards struvite was observed. Scanning transmission electron microscopy (STEM) and elemental mapping showed the distribution of magnesium and calcium elements within Mg-rich calcite. Many organic functional groups, including C=O, C–O–C and C–O, were detected within the biominerals, and these functional groups were also identified in the associated extracellular polymeric substances (EPS). Fifteen kinds of amino acid were detected in the biotic minerals, almost identical to those of the EPS, indicating a close relationship between EPS and biominerals. Most amino acids are negatively charged and able to adsorb cations, providing an oversaturated microenvironment to facilitate mineral nucleation. The X-ray photoelectron spectroscopy (XPS) spectrum of struvite shows the presence of organic functional groups on the mineral surface, suggesting a role of the microorganism in struvite precipitation. The ZW123 bacteria provided carbon and nitrogen for the formation of the biotic minerals through their metabolism, which further emphasizes the close relationship between biominerals and the microorganisms. Thermal studies showed the enhanced thermal stability of biotic minerals, perhaps due to the participation of the bacteria ZW123. The presence of amino acids such as Asp and Glu may explain the high magnesium content of some calcites. Molecular dynamics simulations demonstrated that the morphological change and preferred orientation were likely caused by selective adsorption of EPS onto the various struvite crystal surfaces. Thus, this study shows the significant role played by C. freundii ZW123 in the bioprecipitation of carbonate and phosphate minerals and provides some insights into the processes involved.

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Section: Characteristics Of Minerals Induced By C Freundii Zw123mentioning

confidence: 99%

Bio-Precipitation of Carbonate and Phosphate Minerals Induced by the Bacterium Citrobacter freundii ZW123 in an Anaerobic Environment

Sun

Zhao

et al. 2020

Minerals

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“…It is known that the thickness and mass content of the CuS layer are important to the electrically conductive and antibacterial properties . The thickness of CuS coating was estimated to be about 108 nm by the following formula:

h = \frac{d (|, m_{1} - m_{0}) ρ_{P A N}}{4 m_{0} ρ_{C u S}}

where h is the thickness of the CuS layer, d is the average diameter of PAN fiber (12.7 μm), m 0 and m 1 are the mass (g) of PAN fibers before and after CuS coated, respectively, ρ PAN and ρ CuS are densities of PAN fibers (1.18 g/cm 3 ) and CuS (4.60 g/cm 3 ), respectively.…”

Section: Resultsmentioning

confidence: 99%

Preparation of durable antibacterial and electrically conductive polyacrylonitrile fibers by copper sulfide coating

Wang

Liu

2017

J of Applied Polymer Sci

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In this study, antibacterial and electrically conductive polyacrylonitrile (PAN) fibers were prepared by one‐step reaction between Cu2+ and S2– ions without extra reducing agents. The copper sulfide layer was firmly adhered to PAN fibers with the help of nitrile groups from PAN fibers and chelating agent of ethylenediaminetetraacetic acid disodium salt. The copper sulfide layer was characterized by scanning electron microscopy, transmission electron microscopy, energy‐dispersive spectrometry, X‐ray diffraction, Raman and X‐ray photoelectron spectroscopy. The results illustrated that a compact and uniform copper sulfide layer was coated on PAN fibers with 108 nm thickness, and it was proved to be a pure hexagonal phase of covellite structure. The average resistance of the resultant fibers was about 360 Ω/cm and the mass content of copper sulfide was about 13.3%. The antibacterial tests demonstrated that the resultant fibers exhibited excellent antibacterial properties with antibacterial efficiency of 99.99% against Staphylococcus aureus and 96.80% against Escherichia coli. Furthermore, the antibacterial activities and electrical conductivity still remain good after 30 cycles of standard washing, indicating their good durability when in use. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45496.

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“…The growth and proliferation of bacteria on materials cause many problems including the degradation of the materials, generation of stain and odor, and detriment of the health of human beings . Functionalization of materials with biocidal compounds for antibacterial ability is constantly required and hence becomes a research area of great interest …”

Section: Introductionmentioning

confidence: 99%

Preparation of silicone containing 2,2,6,6‐tetramethyl‐4‐piperidinol‐basedN‐chloramine for antibacterial polyethylene via interpenetration in supercritical carbon dioxide

Chen

Wang

Zhang

et al. 2019

J of Applied Polymer Sci

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Functionalization of polyethylene (PE) with powerful biocides through a friendly and efficient procedure is necessary to obtain extended applications. A novel CO 2 -philic 2,2,6,6-tetramethyl-4-piperidinol (TMP)-based N-chloramine silicone was synthesized via Pt-catalyzed silane alcoholysis between the Si H of poly(methylhydrosiloxane) and O H of TMP and followed by chlorination of amine N H originating from TMP to N Cl. The TMP-based N-chloramine silicone was interpenetrated into PE using supercritical carbon dioxide (scCO 2 ) as working solvent. It was shown that the thickness of the TMP-based N-chloramine silicone layer on PE can be easily controlled by the interpenetration pressure, reaching a maximum value of 70 nm at 28 mp. The synthetic procedures and the interpenetration results were characterized by Fourier transform infrared, scanning electron microscopy, and X-ray photoelectron spectroscopy. In contrast with pristine PE that did not show biocidal ability, the TMP-based N-chloramine silicone modified PE imparted powerful antibacterial abilities, exerting total kills of both Staphylococcus aureus and Escherichia coli of~10 7 cfu mL −1 in 30 min. The biocidal functionality was durable toward washings, storage, and ultraviolet exposure and the recoverability of lost chlorines was good. The interpenetration in scCO 2 tactic provides an environmentally friendly and universal approach to functionalize inert substrates due to no needs of harmful solvent and chemical linkages with biocides.The mainly used biocidal compounds include N-halamines (Nchloramines and N-bromamines), 6-17 quaternary ammonia salts, 18-25 and heavy-metal ions. 26,27 N-halamines are famous and widely used biocidal groups since they are broad spectrum, rechargeable, very stable, and highly efficient. 28,29 Their antibacterial capacity originates from the positively charged halamines (+1) that function as oxidizing agents to oxidize or destruct enzymatic and/or metabolic activities of microorganisms. N-halamines are formed by halogenation of imide/amide/amine N H to N Cl or N Br. The corresponding structures are called imide/amide/amine N-halamines with a stability order of imide < amide < amine structures. 30 As an amine N-halamine precursor, 2,2,6,6-tetramethyl-4-piperidinol (TMP) is stable due to its hindered structure, 31 resistant to photodegradation due to its regular function as ultraviolet (UV) stabilizer, 32 and lack Additional Supporting Information may be found in the online version of this article.

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Synthesis of pyridinium polysiloxane for antibacterial coating in supercritical carbon dioxide

Cited by 28 publications

References 42 publications

Bio-Precipitation of Carbonate and Phosphate Minerals Induced by the Bacterium Citrobacter freundii ZW123 in an Anaerobic Environment

Bio-Precipitation of Carbonate and Phosphate Minerals Induced by the Bacterium Citrobacter freundii ZW123 in an Anaerobic Environment

Preparation of durable antibacterial and electrically conductive polyacrylonitrile fibers by copper sulfide coating

Preparation of silicone containing 2,2,6,6‐tetramethyl‐4‐piperidinol‐basedN‐chloramine for antibacterial polyethylene via interpenetration in supercritical carbon dioxide

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