A facile two-step modifying process for preparation of poly(SStNa)-grafted Fe3O4/SiO2 particles

Lei, Zhongli; Li, Yanli; Wei, Xiangyu

doi:10.1016/j.jssc.2007.12.004

Cited by 82 publications

(45 citation statements)

References 49 publications

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“…Therefore, solvents are always degassed with either nitrogen or argon to purge dissolved oxygen, and reactions quenched by exposure to air. [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] Thus, it may be that a small leak in vial 1 lead to the premature termination of the grafting reaction and thinner pNaSS films on Si and Ti replicate 1.…”

Section: Vasementioning

confidence: 99%

Surface initiated atom transfer radical polymerization grafting of sodium styrene sulfonate from titanium and silicon substrates

Foster

Keefe

Jiang

et al. 2013

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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This study investigates the grafting of poly-sodium styrene sulfonate (pNaSS) from trichlorosilane/10-undecen-1-yl 2-bromo-2-methylpropionate functionalized Si and Ti substrates by atom transfer radical polymerization (ATRP). The composition, molecular structure, thickness, and topography of the grafted pNaSS films were characterized with x-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS), variable angle spectroscopic ellipsometry (VASE), and atomic force microscopy (AFM), respectively. XPS and ToF-SIMS results were consistent with the successful grafting of a thick and uniform pNaSS film on both substrates. VASE and AFM scratch tests showed the films were between 25 and 49 nm thick on Si, and between 13 and 35 nm thick on Ti. AFM determined root-mean-square roughness values were $2 nm on both Si and Ti substrates. Therefore, ATRP grafting is capable of producing relatively smooth, thick, and chemically homogeneous pNaSS films on Si and Ti substrates. These films will be used in subsequent studies to test the hypothesis that pNaSS-grafted Ti implants preferentially adsorb certain plasma proteins in an orientation and conformation that modulates the foreign body response and promotes formation of new bone.

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Section: Vasementioning

confidence: 99%

Surface initiated atom transfer radical polymerization grafting of sodium styrene sulfonate from titanium and silicon substrates

Foster

Keefe

Jiang

et al. 2013

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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“…Catalysts has a very sensitive treatment in technology and modern sciences as they increase reaction yield via reducing the temperature in synthesis of the chemical product 21,22 . There are two basic types of catalysis, (1); "heterogeneous [22][23] , where the reaction accomplishes on the surfaces and the catalysts are in the solid phase.…”

Section: Introductionmentioning

confidence: 99%

“…There are two basic types of catalysis, (1); "heterogeneous [22][23] , where the reaction accomplishes on the surfaces and the catalysts are in the solid phase. (2) "homogeneous 23 , where the catalyst is in one phase as reactant 21 .…”

Section: Introductionmentioning

confidence: 99%

A Nano Catalyst of CoFe2o4@ B18N18 as a Novel Material

Moosavi¹,

Monajjemi²,

Zare³

2017

Orient. J. Chem

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In this work the properties of CoFe2o4@ B 18 N 18 have been illustrated as a novel catalyst to compare with well-known catalyst "Fe3O4@Silica".It has been shown that CoFe2o4 magnetite particle can be use as important catalyst inside the B 18 N 18 ring. In our previous papers amazing result about the B n N n properties have been calculated, exhibited (Struct. Chem., 23, 551-580, (2012); J. Phys. Chem A, 117, 1670-1684, (2013); J. Phys. Chem. C, 114, 15315,(2010) and discussed. In present work it has been shown there is a non-covalent attraction between CoFe2o4 and B 18 N 18 coated molecules. In the system of CoFe2o4@B 18 N 18 catalyst, the magnetic nanoparticles ( MNPs) as a core part causes important change in the electronic structure of B 18 N 18 as a shell which some compounds are specific-sensitive functional groups for this system such as OH, CHO, NH 2 and were subjected to the some organic reaction. The Physical-chemistry properties such as energy densities, potential energy densities, electron densities, ELF, LOL, eta index, ellipticity of electron density and ECP for CoFe2o4@ B 18 N 18 shell have been calculated and simulated in related reactions for those groups-functionalized. Our Calculation indicates that the B 18 N 18 is much better surfaces for CoFe2o4 rather than silica surfaces.

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“…Interest in NaSS extends to a number of applications, such as an antiflocculating agent, emulsifier, catalyst, and for use in ion-exchange resins and membranes. [18][19][20][21] It has also shown promise as a strategy to increase the osseointegration of titanium [22][23][24][25] and poly(ethylene terephthalate) 26-28 biomedical implants. To investigate possible reasons for the increased osseointegration of these materials, in future studies, the authors intend to test the hypothesis that the NaSS-grafted surfaces preferentially adsorb certain plasma proteins in an orientation and conformation that modulates the foreign body response and promotes formation of new bone.…”

Section: Introductionmentioning

confidence: 99%

Experimental design and analysis of activators regenerated by electron transfer-atom transfer radical polymerization experimental conditions for grafting sodium styrene sulfonate from titanium substrates

Foster

Johansson

Tom

et al. 2015

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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A 2 4 factorial design was used to optimize the activators regenerated by electron transfer-atom transfer radical polymerization (ARGET-ATRP) grafting of sodium styrene sulfonate (NaSS) films from trichlorosilane/10-undecen-1-yl 2-bromo-2-methylpropionate (ester ClSi) functionalized titanium substrates. The process variables explored were: (1) ATRP initiator surface functionalization reaction time; (2) grafting reaction time; (3) CuBr 2 concentration; and (4) reducing agent (vitamin C) concentration. All samples were characterized using x-ray photoelectron spectroscopy (XPS). Two statistical methods were used to analyze the results: (1) analysis of variance with a ¼ 0:05, using average ffiffiffiffi ffi Ti p XPS atomic percent as the response; and (2) principal component analysis using a peak list compiled from all the XPS composition results. Through this analysis combined with follow-up studies, the following conclusions are reached: (1) ATRP-initiator surface functionalization reaction times have no discernable effect on NaSS film quality; (2) minimum ( 24 h for this system) grafting reaction times should be used on titanium substrates since NaSS film quality decreased and variability increased with increasing reaction times; (3) minimum ( 0.5 mg cm À2 for this system) CuBr 2 concentrations should be used to graft thicker NaSS films; and (4) no deleterious effects were detected with increasing vitamin C concentration. V C

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A facile two-step modifying process for preparation of poly(SStNa)-grafted Fe3O4/SiO2 particles

Cited by 82 publications

References 49 publications

Surface initiated atom transfer radical polymerization grafting of sodium styrene sulfonate from titanium and silicon substrates

Surface initiated atom transfer radical polymerization grafting of sodium styrene sulfonate from titanium and silicon substrates

A Nano Catalyst of CoFe2o4@ B18N18 as a Novel Material

Experimental design and analysis of activators regenerated by electron transfer-atom transfer radical polymerization experimental conditions for grafting sodium styrene sulfonate from titanium substrates

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