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排序方式: 共有104条查询结果,搜索用时 15 毫秒
91.
Sergiy Rogalskyy Jean‐François Bardeau Oksana Tarasyuk Kateryna Fatyeyeva 《Polymer International》2012,61(5):686-691
Water‐resistant polymeric biocide poly(hexamethylene guanidine) dodecylbenzenesulfonate (PHMG‐DBS) was synthesized by anion metathesis between poly(hexamethylene guanidine) hydrochloride and sodium dodecylbenzenesulfonate and subsequently characterized using elemental analysis, Raman spectroscopy and thermogravimetric analysis. It is found that PHMG‐DBS is thermally stable to at least 350 °C, which makes it suitable for melt blending with polyamide (PA) resins. An antifungal PA‐12 composition was prepared by compression moulding of PA‐12 and PHMG‐DBS powder mixture at 240 °C. The characteristics of the prepared films were investigated: surface roughness and hydrophobicity using atomic force microscopy and contact angle measurements, respectively. No significant change in the material characteristics is observed compared to pure PA‐12 films. PA‐12 films containing 2 wt% of the PHMG‐DBS biocide are found to be highly resistant against Trychophyton mentagrophytes fungus. Copyright © 2012 Society of Chemical Industry 相似文献
92.
Universal method for protein bioconjugation with nanocellulose scaffolds for increased cell adhesion
Volodymyr Kuzmenko Sanna Sämfors Daniel Hägg Paul Gatenholm 《Materials science & engineering. C, Materials for biological applications》2013,33(8):4599-4607
Bacterial nanocellulose (BNC) is an emerging biomaterial since it is biocompatible, integrates well with host tissue and can be biosynthesized in desired architecture. However, being a hydrogel, it exhibits low affinity for cell attachment, which is crucial for the cellular fate process. To increase cell attachment, the surface of BNC scaffolds was modified with two proteins, fibronectin and collagen type I, using an effective bioconjugation method applying 1-cyano-4-dimethylaminopyridinium (CDAP) tetrafluoroborate as the intermediate catalytic agent. The effect of CDAP treatment on cell adhesion to the BNC surface is shown for human umbilical vein endothelial cells and the mouse mesenchymal stem cell line C3H10T1/2. In both cases, the surface modification increased the number of cells attached to the surfaces. In addition, the morphology of the cells indicated more healthy and viable cells. CDAP activation of bacterial nanocellulose is shown to be a convenient method to conjugate extracellular proteins to the scaffold surfaces. CDAP treatment can be performed in a short period of time in an aqueous environment under heterogeneous and mild conditions preserving the nanofibrillar network of cellulose. 相似文献
93.
Strzalka J Xu T Tronin A Wu SP Miloradovic I Kuzmenko I Gog T Therien MJ Blasie JK 《Nano letters》2006,6(11):2395-2405
Extended conjugated chromophores containing (porphinato)zinc components that exhibit large optical polarizabilities and hyperpolarizabiliites are incorporated into amphiphilic 4-helix bundle peptides via specific axial histidyl ligation of the metal. The bundle's designed amphiphilicity enables vectorial orientation of the chromophore/peptide complex in macroscopic monolayer ensembles. The 4-helix bundle structure is maintained upon incorporation of two different chromophores at stoichiometries of 1-2 per bundle. The axial ligation site appears to effectively control the position of the chromophore along the length of the bundle. 相似文献
94.
Crassee I Orlita M Potemski M Walter AL Ostler M Seyller T Gaponenko I Chen J Kuzmenko AB 《Nano letters》2012,12(5):2470-2474
We show that in graphene epitaxially grown on SiC the Drude absorption is transformed into a strong terahertz plasmonic peak due to natural nanoscale inhomogeneities, such as substrate terraces and wrinkles. The excitation of the plasmon modifies dramatically the magneto-optical response and in particular the Faraday rotation. This makes graphene a unique playground for plasmon-controlled magneto-optical phenomena thanks to a cyclotron mass 2 orders of magnitude smaller than in conventional plasmonic materials such as noble metals. 相似文献
95.
Carbonate-rich bentonite was modified by iron and copper chlorides in order to synthesize effective and cheap adsorbents for neutralization of H2S in low-concentrated exhaust gases. Bentonite and modified bentonite were analysed using atomic absorption spectroscopy (AAS), X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and BET surface area analysis. In addition, bentonite and modified bentonite were tested as hydrogen sulfide adsorbents. Iron-containing material showed a significant improvement in the capacity for H2S removal. The longest time of effective protective action (before H2S appears on the outlet of the column) was obtained for the bentonite modified with copper hydroxide. The results indicated that on the surface of modified samples hydrogen sulfide reacts with metal hydroxide forming sulfides. Sulfided iron-containing sample could be regenerated by exposing it to the air. 相似文献
96.
97.
VA Tkachuk VN Bochkov MP Philippova DV Stambolsky ES Kuzmenko MV Sidorova AS Molokoedov VG Spirov TJ Resink 《Canadian Metallurgical Quarterly》1998,421(3):208-212
Tetramicra brevifilum, a microsporidian parasite of Scophthalmus maximus, was found in Lophius budegassa for the first time. This parasite was detected in 5 of 199 hosts captured in the coastal waters of Barcelona (Northwest Mediterranean), which enlarges the geographic distribution of this microsporidian. Affected fish did not show any external sign of disease, and cysts of T. brevifilum were found associated with the body musculature but were easily differentiated from those of Spraguea lophii, another microsporidian present in this host. A case of simultaneous infection by both T. brevifilum and S. lophii was found. 相似文献
98.
Kateryna Artyushkova Stephen Levendosky Plamen Atanassov Julia Fulghum 《Topics in Catalysis》2007,46(3-4):263-275
The chemical structure of non-platinum electrocatalysts obtained from cobalt porphyrins (CoTMPP or CoTPP) by pyrolysis is
investigated by X-ray Photoelectron Spectroscopy (XPS). The catalysts represent highly dispersed, self-supported nano-composites
that demonstrate electrocatalytic performance for oxygen reduction and practically no activity in methanol electro-oxidation.
High-resolution Co2p, C1s, N1s and O1s XPS spectra acquired from precursors and electrocatalysts pyrolyzed at various experimental
conditions were curve-fit using (a) individual peaks of constrained width and shape as well as (b) experimentally obtained
photopeaks from the precursor with additional peaks required for a complete curve fit. Principal Component Analysis (PCA)
applied to quantitative results from the curve-fits of both types of spectra facilitates visualization and identification
of the chemical species that are formed or destroyed, and simplifies evaluation of critical correlations. As a result of these
studies it is established that the catalyst is a nano-composite of highly dispersed pyropolymer with some remaining N
x
-centers inserted into a graphite-like matrix. Approximately 50% of the metal is distributed as Co2+, associated with N4-centers. The remaining cobalt is present in crystallites of metallic Co. A thin layer of CoO coats these metallic cobalt
phases. The developed methodology, described herein, combines model curve-fits and principal component analysis (PCA), resulting
in a quantitative and unambiguous understanding of the chemical composition and structure of complex electrocatalysts. 相似文献
99.
Rusen Zhou Renwu Zhou Xianhui Zhang Kateryna Bazaka Kostya 《Frontiers of Chemical Science and Engineering》2019,13(2):340-349
Continuous processes which allow for large amount of wastewater to be treated to meet drainage standards while reducing treatment time and energy consumption are urgently needed. In this study, a dielectric barrier discharge plasma water bed system was designed and then coupled with granular activated carbon (GAC) adsorption to rapidly remove acid fuchsine (AF) with high efficiency. Effects of feeding gases, treatment time and initial concentration of AF on removal efficiency were investigated. Results showed that compared to the N2 and air plasmas treatments, O2 plasma processing was most effective for AF degradation due to the strong oxidation ability of generated activated species, especially the OH radicals. The addition of GAC significantly enhanced the removal efficiency of AF in aqueous solution and shorten the required time by 50%. The effect was attributed to the ability of porous carbon to trap and concentrate the dye, increasing the time dye molecules were exposed to the plasma discharge zone, and to enhance the production of OH radicals on/in GAC to boost the degradation of dyes by plasma as well as in situ regenerate the exhausted GAC. The study offers a new opportunity for continuous effective remediation of wastewater contaminated with organic dyes using plasma technologies. 相似文献
100.
Arechederra RL Artyushkova K Atanassov P Minteer SD 《ACS applied materials & interfaces》2010,2(11):3295-3302
Precious metal alloys have been the predominant electrocatalyst used for oxygen reduction in fuel cells since the 1960s. Although performance of these catalysts is high, they do have drawbacks. The two main problems with precious metal alloys are catalyst passivation and cost. This is why new novel catalysts are being developed and employed for oxygen reduction. This paper details the low temperature solvothermal synthesis and characterization of carbon nanotubes that have been doped with both iron and cobalt centered phthalocyanine. The synthesis is a novel low-temperature, supercritical solvent synthesis that reduces halocarbons to form a metal chloride byproduct and carbon nanotubes. Perchlorinated phthalocyanine was added to the nanotube synthesis to incorporate the phthalocyanine structure into the graphene sheets of the nanotubes to produce doped nanotubes that have the catalytic oxygen reduction capabilities of the metallo-phthalocyanine and the advantageous material qualities of carbon nanotubes. The cobalt phthalocyanine doped carbon nanotubes showed a half wave oxygen reduction potential of -0.050 ± 0.005 V vs Hg\HgO, in comparison to platinum's half wave oxygen reduction potential of -0.197 ± 0.002 V vs Hg\HgO. 相似文献