Antimicrobial textile materials were produced by sol–gel coatings with embedded biocidal compounds. For preparation a sol–gel
procedure was used, starting from pure silica sols and 3-glycidyloxypropyltriethoxysilane (GLYEO) containing silica sols.
These sols were modified with silver compounds, hexadecyltrimethyl-ammonium-p-toluolsulfonat (HTAT) and copper compounds, respectively. The investigations were performed on viscose fabrics as function
of the concentration of biocidal compounds and of thermal treatment of textile after dip-coating between 80 up to 180 °C.
The use of modified silica coatings leads to a decreased growth of fungi (Aspergillus niger) and bacteria (Bacillus subtilis and Pseudomonas putida) with increasing amount of the biocide embedded in the coating. The addition of GLYEO supports the biocidal effect of the
coatings and enhances the stability of the coating solutions. For preparation of antimicrobial silica coatings the biocides
silver, copper or HTAT can be used alone but the combination of these compounds leads to enhanced results against both fungi
and bacteria. Therefore silica sols containing a combination of different types of biocides may be used for antimicrobial
modification of textiles in some practical applications. For industrial applications the here presented coating solutions
are especially advantageous, because of 90% water content in the solvent. 相似文献
Novel polysiloxanes with pendant biocidal N,N′-dialkylimidazolium salt (ImS) groups were synthesized and compared with polysiloxanes bearing conventional biocidal quaternary ammonium salt (QAS) groups. The bacteriostatic power of these polymers was tested and compared under the same conditions in aqueous solution against two common strains of Gram positive bacteria and three strains of Gram negative bacteria. These new ImS containing polymers exhibited high antibacterial potency against all bacteria studied, similar to those substituted with QAS groups. The advantage of the imidazolium substituted polysiloxane stems from its higher thermal stability, as compared with the quaternary alkylammonium functionalized polymer, as demonstrated by thermogravimetric studies. 相似文献
The outstanding advantages of N-halamine materials over other antimicrobial materials are their durable and rechargeable antimicrobial properties, as well as their efficacies in inactivating a broad spectrum of pathogens. Theoretically, the oxidative chlorine of antimicrobial cotton coated with N-halamine hydantoin diol can be restored upon loss of its biocidal efficacy after exposure to ultraviolet light. In this work nano-titania particles were added into the coating solutions containing N-halamine diol and 1,2,3,4-butanetetracarboxylic acid (BTCA), and the coatings were applied to produce antimicrobial cellulose with improved UV stability. The treated cotton fabrics were characterized by FT-IR, SEM, XRD, and XPS. The effects of the coatings on tensile strength and wrinkle recovery angle were investigated. Biocidal efficacies of fabrics coated with hydantoin diol and diol/TiO2 against Staphylococcus aureus (ATCC 6538) and Escherichia coli O157:H7 (ATCC 43895) were determined using a modified AATCC 100-1999 method and showed excellent antimicrobial properties against these two bacterial species within a brief contact times. It was found that the addition of Nano-TiO2 in the antimicrobial coatings, especially rutile titanium dioxide, could improve the UV light stability of the chlorinated fabrics coated with hydantoin diol significantly. The UV light stability of N-halamine coatings were enhanced with increasing amounts of rutile TiO2. 相似文献
Twenty-two novel N-nitro-N′-substituted phenyl-N-(2,6-dibromo-4-fluorophenyl)urea derivatives were designed and synthesized via a simple and convenient BTC ‘one-pot’ procedure
using DMAP as the catalyst. The structures of all newly synthesized compounds were confirmed by IR, 1H NMR, and elemental analysis, and a part has been identified by 13C NMR. The preliminary bioassay indicates that the target compounds possesses moderate herbicidal activity against Sorghum sudanense. However, some of the title compounds presented high plant growth regulating activity against rape. 相似文献
The properties of titanium carbonitride (TiCN) can be controlled by maintaining the C―N ratio within the coating to a certain level. An experimental study was carried out to vary the composition and properties of TiCN using cathodic arc physical vapour deposition (CAPVD). The substrate used was tungsten carbide (WC-6Co), which was prepared in-house through a powder metallurgy process. In order to form the TiCxN1 − x coatings, titanium (Ti) was used as the cathode, while methane (CH4) and nitrogen (N2) gases were used as sources for C and N, respectively. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) were used to investigate the composition, chemical state, and bonding structure of the deposited coatings. The results show that the composition, intensity of elements, lattice parameter, and d-value of TiCxN1 − x coatings were successfully varied by controlling the CH4 fraction (CH4/N2 ratio). With the increase in CH4 fraction, the intensity of C and N within the TiCxN1 − x coatings increased and decreased, respectively. Consequently, the C―Ti and C―N bonds were increased and N―Ti bonds were decreased. 相似文献
Two N-halamine copolymer precursors, poly(2,2,6,6-tetramethyl-4-piperidyl methacrylate-co-acrylic acid potassium salt) and poly(2,2,6,6-tetramethyl-4-piperidyl methacrylate-co-trimethyl-2-methacryloxyethylammonium chloride) have been synthesized and successfully coated onto cotton fabric via a layer-by-layer (LbL) assembly technique. A multilayer thin film was deposited onto the fiber surfaces by alternative exposure to polyelectrolyte solutions. The coating was rendered biocidal by a dilute household bleach treatment. The biocidal efficacies of tested swatches composed of treated fibers were evaluated against Staphylococcus aureus and Escherichia coli. It was determined that chlorinated samples inactivated both S. aureus and E. coli O157:H7 within 15 min of contact time, whereas the unchlorinated control samples did not exhibit significant biocidal activities. Stabilities of the coatings toward washing and ultraviolet light exposure have also been studied. It was found that the stability toward washing was superior, whereas the UVA light stability was moderate compared to previously studied N-halamine moieties. The layer-by-layer assembly technique can be used to attach N-halamine precursor polymers onto cellulose surfaces without using covalently bonding tethering groups which limit the structure designs. In addition, ionic precursors are very soluble in water, thus promising for biocidal coatings without the use of organic solvents. 相似文献
Biocides are widely used for preventing the spread of microbial infections and fouling of materials. Since their use can build up microbial resistance and cause unpredictable long‐term environmental problems, new biocidal agents are required. In this study, we demonstrate a concept in which an antimicrobial polymer is deactivated by the cleavage of a single group. Following the satellite group approach, a biocidal quaternary ammonium group was linked through a poly(2‐methyloxazoline) to an ester satellite group. The polymer with an octyl‐3‐propionoate satellite group shows very good antimicrobial activity against Gram‐positive bacterial strains. The biocidal polymer was also found to have low hemotoxicity, resulting in a high HC50/MIC value of 120 for S. aureus. Cleaving the ester satellite group resulted in a 30‐fold decrease in antimicrobial activity, proving the concept valid. The satellite group could also be cleaved by lipase showing that the antimicrobial activity of the new biocidal polymers is indeed bioswitchable. 相似文献
Antimicrobial polymeric films that are both mechanically robust and function renewable would have broad technological implications for areas ranging from medical safety and bioengineering to foods industry; however, creating such materials has proven extremely challenging. Here, a novel strategy is reported to create high‐strength N‐halamine incorporated poly(vinyl alcohol‐co‐ethylene) films (HAF films) with renewable antimicrobial activity by combining melt radical graft polymerization and reactive extrusion technique. The approach allows here the intrinsically rechargeable N‐halamine moieties to be covalently incorporated into polymeric films with high biocidal activity and durability. The resulting HAF films exhibit integrated properties of robust mechanical strength, high transparency, rechargeable chlorination capability (>300 ppm), and long‐term durability, which can effectively offer 3–5 logs CFU reduction against typical pathogenic bacterium Escherichia coli within a short contact time of 1 h, even at high organism conditions. The successful synthesis of HAF films also provides a versatile platform for exploring the applications of antimicrobial N‐halamine moieties in a self‐supporting, structurally adaptive, and function renewable form.
Polystyrene(PS) microspheres were functionalized with poly(styrene-b-tert-butyl acrylate)(P(S-b-tBA)) by adsorption from supercritical mixture of CO2 and hexane.Supercritical deposition formed a shell-core structure that contained a shell of poly(tert-butyl acrylate)(PtBA) blocks and a core of the PS blocks entangling with the PS microspheres. The thickness of the PtBA layer and thereby the areal density of tert-butyl ester groups increased with the deposition pressure until plateau values attained at 20 MPa and higher.The tert-butyl ester groups were hydrolyzed to carboxyl groups for conjugation with tert-butylamine molecules via amide bonds that were further chlorinated into biocidal N-halamine moieties. The functionalization layer and its bonded N-halamine moieties were stable in flowing water and the chlorine could be regenerated upon eventual loss.This functionalization concept is applicable to polymers of any external and internal surfaces to achieve diverse surface properties by varying block copolymer and conjugated moieties. 相似文献
Summary: In this study we report both the development of dithiocarbamate resins from the commercial hypercrosslinked resin MN-250 and the evaluation of the biocidal capacity of this material against E. coli ATCC25922 suspensions. The preparation of dithiocarbamate resins followed a synthetic pathway based on nitration of resins, reduction of nitro groups and reaction with CS2 in an alkaline medium. The biocidal capacity was evaluated by means of elution of E. coli suspensions (103–107 cells/mL) through columns containing the resin and plating on LB nutrient medium solidified with Bacto agar. We can conclude that hypercrosslinked resins with dithiocarbamate groups have potential biocidal action. 相似文献
Inhibiting effect on acid corrosion of steel 45 and biocidal activity with respect to sulfate-reducing bacteria are studied for a series of N-aryl-N-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-3-ylmethyl)amines. 相似文献
The reaction of triethoxy(3-aminopropyl)silane with carbon disulfide andortho-chloroethyl formate in absolute ethanol gave triethoxy(3-isothiocyanatopropyl)silane for the first time. The presence of SCN and (C2H5O)3Si groups in this compound enabled us to use it for the preparation of adsorbents and polymer coatings with biocidal activity.Irkutsk Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, 664033 Irkutsk. Translated fromIzvestiya Akademii Nauk, Seriya Khimicheskaya, No. 11, pp. 2681–2682, November, 1992. 相似文献