Controllable Preparation of Uniform Micron‐Sized Barium‐Sulfate Spheres

Liu, Yuejiao; Guo, Xiaoyan; Yang, Suohe; He, Guangping; Jin, Haibo

doi:10.1002/crat.201700212

Cited by 12 publications

(15 citation statements)

References 20 publications

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“…In this strategy, spherical BaSO 4 NP is used as the sacrificial template for the inner cavity, and the APF serves as the mesoporous template and structural direct agent in the shell. The monodispersed BaSO 4 NP is prepared through a controlled deposition process based on the literature report [ 33 ]. The key to this synthesis is that EDTA was added to chelate with Ba 2+ and control the release of Ba 2+ in solution.…”

Section: Resultsmentioning

confidence: 99%

“…In order to monitor component changes of the samples in the synthetic process, the FTIR spectra of BaSO 4 NP, BaSO 4 @APF-SiO 2 , BaSO 4 @mSiO 2 , and HMSN, were detected. The characteristic peaks of BaSO 4 occurred at 1171, 1063, 982, 632, and 605 cm −1 ( Figure 2 b) [ 33 , 34 ]. Two additional peaks at 1577 and 1407 cm −1 could be assigned to the asymmetric and symmetric stretching vibrations of C–O in ionized and coordinated EDTA, suggesting that some EDTA coexists with the BaSO 4 NP [ 37 , 38 ].…”

Section: Resultsmentioning

confidence: 99%

“…The synthesis is achieved through the sol-gel co-deposition of silica and APF onto the surface of barium sulfate nanoparticles (BaSO 4 NP), which act as hard templates for the hollow cavity ( Figure 1 a). The advantages of using BaSO 4 NP as the sacrificial core template are that it is easy to prepare, size-adjustable, stable in water, and easy to remove with weakly alkaline solutions of ethylenediaminetetraacetic acid (EDTA) [ 33 ]. Also, the surface of BaSO 4 NPs is full of OH − , which provides an affinity interface for the sol-gel coating of silica [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

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Dendritic Mesoporous Silica Hollow Spheres for Nano-Bioreactor Application

Zhang

Fang

et al. 2022

Nanomaterials

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Mesoporous silica materials have attracted great research interest for various applications ranging from (bio)catalysis and sensing to drug delivery. It remains challenging to prepare hollow mesoporous silica nanoparticles (HMSN) with large center-radial mesopores that could provide a more efficient transport channel through the cell for guest molecules. Here, we propose a novel strategy for the preparation of HMSN with large dendritic mesopores to achieve higher enzyme loading capacity and more efficient bioreactors. The materials were prepared by combining barium sulfate nanoparticles (BaSO4 NP) as a hard template and the in situ-formed 3-aminophenol/formaldehyde resin as a porogen for directing the dendritic mesopores’ formation. HMSNs with different particle sizes, shell thicknesses, and pore structures have been prepared by choosing BaSO4 NP of various sizes and adjusting the amount of tetraethyl orthosilicate added in synthesis. The obtained HMSN-1.1 possesses a high pore volume (1.07 cm3 g−1), a large average pore size (10.9 nm), and dendritic mesopores that penetrated through the shell. The advantages of HMSNs are also demonstrated for enzyme (catalase) immobilization and subsequent use of catalase-loaded HMSNs as bioreactors for catalyzing the H2O2 degradation reaction. The hollow and dendritic mesoporous shell features of HMSNs provide abundant tunnels for molecular transport and more accessible surfaces for molecular adsorption, showing great promise in developing efficient nanoreactors and drug delivery vehicles.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dendritic Mesoporous Silica Hollow Spheres for Nano-Bioreactor Application

Zhang

Fang

et al. 2022

Nanomaterials

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“…BaSO 4 microspheres (1.3~1.8 µm) were prepared in our own laboratory [ 14 ]. CA weighted 30,000 g∙mol −1 of average molecular was procured from Sino Pharm Group (Beijing, China).…”

Section: Methodsmentioning

confidence: 99%

“…For example, TiO 2 improves the hydrophilicity of the sheet, and a TiO 2/ cellulose acetate (CA) sheet and a BaSO 4 /CA sheet can improve the reflectance. The light reflectance value of a TiO 2 bifunctional sheet is less than 92% and 92~98% in the wavelength range of 400~450 nm and 450~800 nm, respectively [ 13 ], while a bifunctional sheet prepared with BaSO 4 can reach 97% and over 98% in the range of 400~450 nm and 450~800 nm, respectively [ 14 ], which is higher than a TiO 2 bifunctional sheet. The bifunctional sheets prepared by BaSO 4 microspheres with narrow particle size distribution are used in dry chemical diagnosis [ 15 ], which is not only conducive to form a wider response range, but also can form uniform micron-level secondary voids between particles to filter and uniformly disperse serum.…”

Section: Introductionmentioning

confidence: 99%

Preparation, Characterisation, and Application of Bifunctional BaSO4 Sheets

et al. 2020

Self Cite

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Barium sulfate (BaSO4) is a material with high reflectance for preparing bifunctional sheets used in dry reagent chemical tests. In this study, bifunctional BaSO4 sheets with scattering power and high reflectance were prepared with BaSO4 microspheres sized 1.3~1.8 μm and cellulose acetate (CA). Factors such as the BaSO4 morphology, CA dosage, mixing time, surfactant, solid content and wet sheet thickness were investigated. Scanning electron microscopy (SEM), a dynamic contact angle test, light reflection detector and light reflection densitometer were employed to characterize the structure and properties of bifunctional BaSO4 sheets. The optimal conditions for preparing bifunctional BaSO4 sheets under natural drying conditions were as follows: mass ratio of CA to BaSO4 microspheres was 0.03:1; mixing acetone solution was used to form liquid stock puree; 35 μL Tween-80 was used to improve the hydrophilicity of bifunctional sheets; solid content was 54.9%; mixing 2 h then 450 µm thick sheets were cast on a glass plate using a film applicator. The light reflectance value of bifunctional BaSO4 sheets in the range of 400~800 nm was higher than 97%. Serum diffused in bifunctional BaSO4 sheets reacted in reagent sheets and formed uniform colorful spots. Considering the repeatability of spot proportion and light reflectance value, the sheet offered a uniform serum scattering power and good repeatability. Therefore, the bifunctional BaSO4 sheets are regarded as a promising material for dry chemical diagnostic reagents.

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A highly sensitive electrochemical sensor based on surface molecularly imprinted polymers and graphene carbon nanotubes for highly selective detection of chlorpyrifos

Huang,

Zhao,

Wang

et al. 2024

Polymers for Advanced Techs

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Pesticide residues represent a serious challenge for environmental protection, food safety, and public health. Addressing this challenge, this study strategically developed an electrochemical sensor with molecularly imprinted polymers (MIPs) as the recognition element to accurately detect chlorpyrifos in environmental samples. In this study, we used vinyl‐modified SiO2 as the matrix, methacrylic acid as the functional monomer, ethylene glycol dimethacrylate as the cross‐linker, and azobisisobutyronitrile as the initiator to synthesize the surface‐imprinted polymers. The development of the electrochemical sensor involved a detailed modification of the electrode, first by integrating carboxylated multi‐walled carbon nanotubes and graphene oxide to improve its properties, and then by applying a suspension of MIPs to the glassy carbon electrode. This process resulted in a sensor capable of detecting chlorpyrifos in environmental samples with high sensitivity. The electrochemical sensor, designed for chlorpyrifos detection, exhibited a robust linear response in peak current to varying concentrations of chlorpyrifos, ranging from 1 × 10−11 to 1 × 10−5 mol L−1. It achieved a detection limit as low as 1.85 × 10−11 mol L−1 (S/N = 3). Testing confirmed the sensor's exceptional repeatability, stability, and high selectivity towards chlorpyrifos, underscoring its efficacy. The demonstrated capabilities of this sensor suggest its substantial potential for widespread use in pesticide regulation and environmental conservation efforts.

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Controllable Preparation of Uniform Micron‐Sized Barium‐Sulfate Spheres

Cited by 12 publications

References 20 publications

Dendritic Mesoporous Silica Hollow Spheres for Nano-Bioreactor Application

Dendritic Mesoporous Silica Hollow Spheres for Nano-Bioreactor Application

Preparation, Characterisation, and Application of Bifunctional BaSO4 Sheets

A highly sensitive electrochemical sensor based on surface molecularly imprinted polymers and graphene carbon nanotubes for highly selective detection of chlorpyrifos

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