The preparation of a recyclable catalyst of silver nanoparticles dispersed in a mesoporous silica nanofiber matrix

RSC Advances ◽  
2016 ◽  
Vol 6 (70) ◽  
pp. 65613-65618 ◽  
Author(s):  
Dalong Li ◽  
Mingdong Dong ◽  
Flemming Besenbacher ◽  
Yudong Huang ◽  
Menglin Chen
Keyword(s):  
Silver Nanoparticles ◽  
Mesoporous Silica ◽  
Recyclable Catalyst ◽  
Electrospinning Technique ◽  
Sliver Nanoparticles ◽  
Silica Nanofiber

A recyclable catalyst of sliver nanoparticles well dispersed in mesoporous silica was successfully synthesized via a straight-forward strategy combining an electrospinning technique with post-calcination.

Alternating chiral selectivity of aldol reactions under the confined space of mesoporous silica

2015 ◽  
Vol 51 (96) ◽  
pp. 17116-17119 ◽  
Author(s):  
Chewei Yeh ◽  
Yan-Ru Sun ◽  
Shing-Jong Huang ◽  
Yeun-Min Tsai ◽  
Soofin Cheng
Keyword(s):  
Mesoporous Silica ◽  
Aldol Reaction ◽  
Recyclable Catalyst ◽  
Aldol Reactions ◽  
Water Medium ◽  
Confined Space ◽  
Asymmetric Aldol ◽  
Co Catalysts ◽  
Asymmetric Aldol Reaction ◽  
Chiral Selectivity

The chiral selectivities were altered and high diastereo- and enantio-selectivities of the products were obtained in water medium without adding acid co-catalysts when a primary–tertiary diamine catalyst was immobilized on mesoporous SBA-15 to form a recyclable catalyst for the direct asymmetric aldol reaction of cyclohexanone with p-nitrobenzaldehyde.

Preparation of mesoporous silica-based nanocomposites with synergistically antibacterial performance from nano-metal (oxide) and polydopamine

2021 ◽  
Author(s):  
Guofeng Su ◽  
Ximing Zhong ◽  
Songfa Qiu ◽  
Jiajin Fan ◽  
hongjun zhou ◽  
...  
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Mesoporous Silica ◽  
Synergistic Effect ◽  
Practical Applications ◽  
Antibacterial Performance ◽  
Large Size ◽  
Zinc Oxides ◽  
Nanocomposite System ◽  
Nano Zinc

Abstract In this work, a novel antibacterial nanocomposite system was developed using mesoporous silica (MSN) as an effective nanocarrier, and the resultant nanocomposites demonstrated remarkable antibacterial performance due to the synergistic effect among nano zinc oxides, silver nanoparticles, and polydopamine (PDA). The successful synthesis of MSN/ZnO@PDA/Ag nanocomposites was confirmed. The physicochemical properties and the morphologies of these nanocomposites were investigated. It was found that the particle size increased along with the evolution of these nanocomposites. Besides, nano zinc oxides were formed in the nanoconfinement channel of mesoporous silica with a particle size about 2 nm, and that of silver nanoparticle was less than 50 nm. In addition, the results revealed that the presence of mesoporous silica could effectively prevent the formation of large-size silver nanoparticles and facilitate their well dispersion. Due to the synergistic effect among nano zinc oxides, silver nanoparticles, and polydopamine, these nanocomposites exhibited remarkable antibacterial performance even at a low concentration of 313 ppm, and the antibacterial mechanism was also elucidated. Therefore, this work provides a facile and controllable approach to preparing synergistically antibacterial nanocomposites, and the remarkable antibacterial performance make them suitable for practical applications.

Biophysical properties of electrospun chitosan-grafted poly(lactic acid) nanofibrous scaffolds loaded with chondroitin sulfate and silver nanoparticles

2021 ◽  
pp. 088532822110464
Author(s):  
Alexandre F Júnior ◽  
Charlene A Ribeiro ◽  
Maria E Leyva ◽  
Paulo S Marques ◽  
Carlos R J Soares ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Lactic Acid ◽  
Proton Nuclear Magnetic Resonance ◽  
Poly Lactic Acid ◽  
Fibroblast Cells ◽  
Biophysical Properties ◽  
Electrospinning Technique ◽  
Average Pore ◽  
H Nmr ◽  
Substitution Degree

The aim of this work was to study the biophysical properties of the chitosan-grafted poly(lactic acid) (CH-g-PLA) nanofibers loaded with silver nanoparticles (AgNPs) and chondroitin-4-sulfate (C4S). The electrospun CH-g-PLA:AgNP:C4S nanofibers were manufactured using the electrospinning technique. The microstructure of the CH-g-PLA:AgNP:C4S nanofibers was investigated by proton nuclear magnetic resonance (1H-NMR), scanning electron microscopy (SEM), UV-Visible spectroscopy (UV-Vis), X-ray diffraction (XRD), and Fourier transform infrared (ATR-FTIR) spectroscopy. ATR-FTIR and 1H-NMR confirm the CH grafting successfully by PLA with a substitution degree of 33.4%. The SEM measurement results indicated apparently smooth nanofibers having a diameter range of 340 ± 18 nm with porosity of 89 ± 3.08% and an average pore area of 0.27 μm2. UV-Vis and XRD suggest that silver nanoparticles with the size distribution of 30 nm were successfully incorporated into the electrospun nanofibers. The water contact angle of 12.8 ± 2.7° reveals the hydrophilic nature of the CH-g-PLA:AgNP:C4S nanofibers has been improved by C4S. The electrospun CH-g-PLA:AgNP:C4S nanofibers are found to release ions Ag+ at a concentration level capable of rendering an antimicrobial efficacy. Gram-positive bacteria ( S.aureus) were more sensitive to CH-g-PLA:AgNP:C4S than Gram-negative bacteria ( E. coli). The electrospun CH-g-PLA:AgNP:C4S nanofibers exhibited no cytotoxicity to the L-929 fibroblast cells, suggesting cytocompatibility. Fluorescence microscopy demonstrated that C4S promotes the adhesion and proliferation of fibroblast cells onto electrospun CH-g-PLA:AgNP:C4S nanofibers.

scholarly journals Silver Nanoparticles Confined in SBA-15 Mesoporous Silica and the Application as a Catalyst for Glucose Oxidation

2012 ◽  
Vol 10 (0) ◽  
pp. 273-276
Author(s):  
Bui Thi Thanh Ha ◽  
Nguyen Thi Minh Thu ◽  
Giang Thi Phuong Ly ◽  
Nguyen Thanh Binh ◽  
Le Thanh Son ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Mesoporous Silica ◽  
Glucose Oxidation

Size dependence of silver nanoparticles in carboxylic acid functionalized mesoporous silica SBA-15 for catalytic reduction of 4-nitrophenol

RSC Advances ◽  
2016 ◽  
Vol 6 (42) ◽  
pp. 35167-35176 ◽  
Author(s):  
Diganta Saikia ◽  
Ya-Yang Huang ◽  
Cheng-En Wu ◽  
Hsien-Ming Kao
Keyword(s):  
Silver Nanoparticles ◽  
Carboxylic Acid ◽  
Mesoporous Silica ◽  
Size Dependence ◽  
Catalytic Reduction ◽  
Highly Active ◽  
Functionalized Mesoporous Silica

Silver nanoparticles with a size around 3 nm are formed within the mesopores of –COOH functionalized mesoporous silica SBA-15, and they are highly active in the catalytic reduction of 4-nitrophenol.

DNA-templated in situ growth of silver nanoparticles on mesoporous silica nanospheres for smart intracellular GSH-controlled release

2015 ◽  
Vol 51 (30) ◽  
pp. 6544-6547 ◽  
Author(s):  
Changhui Liu ◽  
Zhihe Qing ◽  
Jing Zheng ◽  
Li Deng ◽  
Cheng Ma ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Controlled Release ◽  
Mesoporous Silica ◽  
In Situ Growth ◽  
Silica Nanospheres ◽  
Mesoporous Silica Nanospheres

AgNPs are prepared in situ by the DNA-templated process as tunable gatekeepers for mesoporous silica nanocontainers for smart intracellular GSH-controlled release.

Ordered mesoporous silica cubic particles decorated with silver nanoparticles: a highly active and recyclable heterogeneous catalyst for the reduction of 4-nitrophenol

2019 ◽  
Vol 48 (8) ◽  
pp. 2692-2700 ◽  
Author(s):  
Hui-Tao Fan ◽  
Xue-Guo Liu ◽  
Xiao-Jing Xing ◽  
Bo Li ◽  
Kun Wang ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Potential Application ◽  
High Surface ◽  
High Surface Area ◽  
Ordered Mesoporous Silica ◽  
Highly Active ◽  
Ordered Mesoporous ◽  
Recyclable Heterogeneous Catalyst

An Ag–OMS-C nanocomposite with a high surface area was proposed, and its potential application for catalytic activity was highlighted.

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