scholarly journals β-Cyclodextrin-Modified Mesoporous Silica Nanoparticles with Photo-Responsive Gatekeepers for Controlled Release of Hexaconazole

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1489
Author(s):  
Hua Pan ◽  
Wenjing Li ◽  
Litao Wu ◽  
Weilan Huang ◽  
Fang Zhang
Keyword(s):  
Controlled Release ◽  
Mesoporous Silica ◽  
Photoelectron Spectroscopy ◽  
Mesoporous Silica Nanoparticles ◽  
Average Diameter ◽  
Mesoporous Structure ◽  
Release Kinetic ◽  
Mesoporous Composite ◽  
X Ray ◽  
Spherical Structure

In the present research, photo-responsive controlled-release hexaconazole (Hex) nanoparticles (Nps) were successfully prepared with azobenzene (Azo)-modified bimodal mesoporous silica (BMMs), in which β-cyclodextrin (β-CD) was capped onto the BMMs-Azo surface via host–guest interactions (Hex@BMMs/Azo/β-CD). Scanning electron microscopy (SEM) confirmed that the nanoparticles had a spherical structure, and their average diameter determined by dynamic light scattering (DLS) was found to be 387.2 ± 3.8 nm. X-ray powder-diffraction analysis and N2-adsorption measurements indicated that Hex was loaded into the pores of the mesoporous structure, but the structure of the mesoporous composite was not destroyed. The loading capacity of Hex@BMMs/Azo/β-CD nanoparticles for Hex was approximately 27.3%. Elemental components of the nanoparticles were characterized by X-ray photoelectron spectroscopy (XPS) and electron dispersive spectroscopy (EDS). Ultraviolet–visible-light (UV–Vis) absorption spectroscopy tests showed that the azophenyl group in BMMs-Azo undergoes effective and reversible cis-trans isomerization under UV–Vis irradiation. Hex@BMMs/Azo/β-CD Nps exhibited excellent light-sensitive controlled-release performance. The release of Hex was much higher under UV irradiation than that in the dark, which could be demonstrated by the bioactivity test. The nanoparticles also displayed excellent pH-responsive properties, and the sustained-release curves were described by the Ritger–Peppas release kinetic model. BMMs nanocarriers had good biological safety and provided a basis for the development of sustainable agriculture in the future.

scholarly journals Quantum-Sized Zinc Oxide Nanoparticles Synthesised within Mesoporous Silica (SBA-11) by Humid Thermal Decomposition of Zinc Acetate

Crystals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 549
Author(s):  
Tariq Aqeel ◽  
Heather F. Greer
Keyword(s):  
Zinc Oxide ◽  
Mesoporous Silica ◽  
Photoelectron Spectroscopy ◽  
Zinc Acetate ◽  
Zinc Oxide Nanoparticles ◽  
Mesoporous Structure ◽  
Oxide Nanoparticles ◽  
Basic Solution ◽  
X Ray ◽  
Vis Spectroscopy

A modified facile method is presented to synthesise quantum-sized zinc oxide nanoparticles within the pores of a mesoporous silica host (SBA-11). This method eliminates the 3 h alcohol reflux and the basic solution reaction steps of zinc acetate. The mesoporous structure and the ZnO nanoparticles were analysed by X-ray diffractometry, transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, nitrogen sorption analysis and UV–VIS spectroscopy. These tests confirm the synthesis of ~1 nm sized ZnO within the pores of SBA-11 and that the porous structure remained intact after ZnO synthesis.

P(VPBA-DMAEA) as a pH-sensitive nanovalve for mesoporous silica nanoparticles based controlled release

2015 ◽  
Vol 26 (10) ◽  
pp. 1203-1208 ◽  
Author(s):  
Yu-Jie Chang ◽  
Xi-Zhen Liu ◽  
Qing Zhao ◽  
Xiao-Hai Yang ◽  
Ke-Min Wang ◽  
...  
Keyword(s):  
Controlled Release ◽  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Ph Sensitive

scholarly journals 3D Modeling of Silver Doped ZrO2 Coupled Graphene-Based Mesoporous Silica Quaternary Nanocomposite for a Nonenzymatic Glucose Sensing Effects

Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 193
Author(s):  
Kamrun Nahar Fatema ◽  
Chang-Sung Lim ◽  
Yin Liu ◽  
Kwang-Youn Cho ◽  
Chong-Hun Jung ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Mesoporous Silica ◽  
Photoelectron Spectroscopy ◽  
Glucose Sensor ◽  
Diffuse Reflectance Spectroscopy ◽  
Active Material ◽  
Glucose Sensing ◽  
X Ray ◽  
Transmission Electron

We described the novel nanocomposite of silver doped ZrO2 combined graphene-based mesoporous silica (ZrO2-Ag-G-SiO2,) in bases of low-cost and self-assembly strategy. Synthesized ZrO2-Ag-G-SiO2 were characterized through X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDX), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, Nitrogen adsorption-desorption isotherms, X-ray photoelectron spectroscopy (XPS), and Diffuse Reflectance Spectroscopy (DRS). The ZrO2-Ag-G-SiO2 as an enzyme-free glucose sensor active material toward coordinate electro-oxidation of glucose was considered through cyclic voltammetry in significant electrolytes, such as phosphate buffer (PBS) at pH 7.4 and commercial urine. Utilizing ZrO2-Ag-G-SiO2, glucose detecting may well be finished with effective electrocatalytic performance toward organically important concentrations with the current reaction of 9.0 × 10−3 mAcm−2 and 0.05 mmol/L at the lowest potential of +0.2 V, thus fulfilling the elemental prerequisites for glucose detecting within the urine. Likewise, the ZrO2-Ag-G-SiO2 electrode can be worked for glucose detecting within the interferometer substances (e.g., ascorbic corrosive, lactose, fructose, and starch) in urine at proper pH conditions. Our results highlight the potential usages for qualitative and quantitative electrochemical investigation of glucose through the ZrO2-Ag-G-SiO2 sensor for glucose detecting within the urine concentration.

scholarly journals Mesoporous Silica Nanoparticles Based Antigens and Nucleic Acids Delivery: A Review

1970 ◽  
Vol 8 (2) ◽  
pp. 50-57
Author(s):  
Jemal Dilebo
Keyword(s):  
Mesoporous Silica ◽  
Nucleic Acids ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Mesoporous Structure ◽  
Nucleic Acid Delivery ◽  
Hollow Core ◽  
Small Molecule Drugs ◽  
Cell Accumulation ◽  
Nucleic Acids Delivery

Mesoporous silica nanoparticles (MSN) have been explored for the delivery of small molecule drugs, antigens, and nucleic acids because of their large surface area, pore volume, amenability of their surface for functionalization, stable mesoporous structure, and biocompatibility.  Biomoecules loading capacitites,  release and target cell accumulation efficiencies have been improved for both antigen and nucleic acid delivery by the synthesis of large-pore MSN, dendritic MSN, hollow-core MSN, and multifunctional MSN. This article overview the major advances in the use of MSN for delivery of antigens and therapeutic nucleic acids such as DNA, siRNA, and miRNA aimed for treatment of various diseases.       

Preparation of PCL/PVP/Ag Nanofiber Membranes by Electrospinning Method

2012 ◽  
Vol 268-270 ◽  
pp. 580-583 ◽  
Author(s):  
Yong Tang Jia ◽  
Cui Wu ◽  
Feng Chun Dong ◽  
Gang Huang ◽  
Xian Hua Zeng
Keyword(s):  
Silver Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Composite Nanofibers ◽  
Average Diameter ◽  
Vinyl Pyrrolidone ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrospinning Method ◽  
Nanofiber Membranes ◽  
Poly Vinyl Pyrrolidone

The composite nanofiber membranes of poly (ε-caprolactone)/poly(vinyl pyrrolidone) (PCL/PVP) containing silver nanoparticles were prepared by electrospinning method. The morphology of composite nanofibers was characterized by scanning electron microscopy (SEM). The silver nanoparticles on the electrospun fibers were characterized by X-Ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The contact angle and water uptake of PCL/PVP/Ag nanofiber membranes were measured. The SEM photos indicated that the average diameter of the fibers was significantly decreased with the addition of silver nanoparticles. The X-Ray images showed that Ag nanoparticles were distributed on the surface of nanofiber membranes. When the PVP mole ratio was higher than 15%, the nanofiber membranes showed good hydrophilic property. The PCL/PVP/Ag nanofiber membranes could be applied to prepare wound dressing.

scholarly journals Ultrasound-mediated cavitation-enhanced extravasation of mesoporous silica nanoparticles for controlled-release drug delivery

2018 ◽  
Vol 340 ◽  
pp. 2-8 ◽  
Author(s):  
Juan L. Paris ◽  
Christophoros Mannaris ◽  
M. Victoria Cabañas ◽  
Robert Carlisle ◽  
Miguel Manzano ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Controlled Release ◽  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Release Drug

scholarly journals Anions as Triggers in Controlled Release Protocols from Mesoporous Silica Nanoparticles Functionalized with Macrocyclic Copper(II) Complexes

2016 ◽  
Vol 22 (39) ◽  
pp. 13935-13945 ◽  
Author(s):  
Sameh El Sayed ◽  
Michele Milani ◽  
Chiara Milanese ◽  
Maurizio Licchelli ◽  
Ramón Martínez-Máñez ◽  
...  
Keyword(s):  
Controlled Release ◽  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles
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