英语翻译DTBE and DTBU were prepared by acrylation of bis(2-hydro

英语翻译
DTBE and DTBU were prepared by acrylation of bis(2-hydroethyl)
disulfide and bis(2-hydroethyl) disulfide,obtained by employing the
method described by Hawker and co-workers.[16] Briefly,2-bromo-2-
methylpropionyl bromide (14.8 mmol) was added dropwise to a
mixture of the disulfide (6.17 mmol) and triethylamine (31.5 mmol) in
dichloromethane (150 mL) at 08C under an argon atmosphere.The
solution was stirred at 08C for 1h and then for another 2 h at room
temperature.After the precipitates were filtered off,the organic
phase was extracted with 2n Na2CO3 solution saturated with NH4Cl
to remove the excess bromides.Subsequent removal of dichloromethane
yielded DTBE and DTBU.
DTBE (4.6 mg) or DTBU (7.2 mg) was dissolved in THF (10 mL)
and the solution then added dropwise to an aqueous solution of Au or
Ag-NPs (40 mL).After incubating the mixtures for 6–12 h,followed
by removal of excess initiators by centrifugation,the initiator-capped
nanoparticles were obtained and suspended in water for further use.
A solution of 4-nm g-Fe2O3 nanoparticles in toluene (5 mL) was
incubated with a solution of BMPA (1.67 mg) in toluene (5 mL) for
two days.The subsequent removal of excess BMPAyielded g-Fe2O3@
BMPA nanoparticles and they were suspended in toluene for further
use.
UV/Vis absorption spectra were recorded by using a Cary 50 UVvisible
spectrophotometer.TEM images were obtained by using a
Zeiss EM 912 Omega microscope at an acceleration voltage of
120 kV.Contact angle measurements were implemented with a
contact angle measuring system G10 apparatus (KrHss,Germany) at
ambient temperature.