Controlled Release of Corrosion Inhibitor from Intelligent Nanocontainers Based on Acid and Base Dual-responsive†

doi:10.7503/cjcu20130880

Abstract

Abstract:

Hollow mesoporous silica nanoparticles(HMSs) were prepared using polystyrene microspheres(PS) as hard templates. The supramolecular nanovalves in the form of bistable pseudorotaxane molecules were installed on the surface of the HMSs and achieved the acidic and basic dual stimuli-responsive release effects of corrosion inhibitor molecules, benzotriazole(BTA). The morphology and structure of HMSs were characte-rized by transmission electron microscope(TEM), X-ray diffraction assay(XRD), Brunauer-Emmett-Teller(BET) and Barrett-Joyner-Halenda(BJH) analyses. The surface functionalization of HMSs was demonstrated by Fourier transform infrared spectrometer(FTIR) and thermogravimetric analysis(TGA). The release performances of BTA at different pH values were monitored by UV-Vis spectrophotometer. The results showed that the HMSs were monodispersed nanospheres and the specific surface area was 1141.16 m²/g. The intelligent nanocontainers constructed by the supramolecular self-assembly technology realized “zero premature release” at neutral condition and remarkable release at acidic or alkaline conditions.

Key words: Hollow mesoporous silica nanoparticles, Nanovalve, Corrosion inhibitor, Acidic and alkaline stimuli-responsive

CLC Number:

O622
O657

TrendMD:

YANG Nianwang, CHEN Tao, FU Jiajun. Controlled Release of Corrosion Inhibitor from Intelligent Nanocontainers Based on Acid and Base Dual-responsive^†[J]. Chem. J. Chinese Universities, 2014, 35(5): 971.

Figures/Tables 6

Scheme 1 HMSs surface functionalization, loading of BTA and controlled release

Fig.1 TEM images of HMSs in low(A) and high(B) magnification

Fig.2 Small-angle XRD patterns of HMSs(a), CM-HMSs(b), HDA-HMSs(c) and Fc-HMSs(d)

Table 1 BET and BJH parametersof HMSs, Fc-HMSs and CB7-HMSs

Sample	Specific surface area/(m²·g^-1)	BJH average pore diameter/nm	Pore volume/(cm³·g^-1)
HMSs	1141.16	2.78	1.08
Fc-HMSs	832.35	2.32	0.77
CB7-HMSs	160.12	1.95	0.21

Fig.3 Standard curves of UV absorption intensity of BTA(A) and UV absorption spectra of BTA controlled release(B)

Fig.4 Release experiments of BTA from acid and base dual-responsive CB7-HMSs under acidic(A) and alkaline coditions(B)^(A) a. pH=2.0; b. pH=3.0; c. pH=4.0; d. pH=5.0; e. pH=6.5; (B) a. pH=10.0; b. pH=9.0; c. pH=8.0; d. pH=6.5.

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