scholarly journals Biological Applications and Transmission Electron Microscopy Investigations of Mesoporous Silica Nanoparticles

2006 ◽  
Author(s):  
Brian G. Trewyn
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Biological Applications ◽  
Transmission Electron

Synthesis and Characterization of Thiol- and Carboxyl-Functionalized Mesoporous Silica Nanoparticles

2017 ◽  
Vol 1142 ◽  
pp. 220-224 ◽  
Author(s):  
Wan Xia Wang ◽  
Yu Wang ◽  
Hua Meng Gong ◽  
Hong Hao Sun ◽  
Ming Xing Liu
Keyword(s):  
Electron Microscopy ◽  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Spherical Shape ◽  
Synthesis And Characterization ◽  
Functionalized Mesoporous Silica ◽  
Transmission Electron ◽  
Ft Ir

The purpose of this article is to synthesize the thiol-and carboxyl-bifunctionalized mesoporous silica nanoparticles (CMS-SH-COOH). CMS-SH-COOH was successfully synthesized by co-condensation and post-grafting methods. Moreover, the particle size and structural properties of CMS-SH-COOH were characterized by transmission electron microscopy (TEM), dynamic light scattering (DLS) and Fourier transform infrared spectroscopy (FT-IR). The obtained results indicated that the CMS-SH-COOH presented a uniform spherical shape with a wormhole arrangement of the mesopores and a relatively narrow paticle distribition. Therefore, the CMS-SH-COOH might be a great potential carrier for the drug delivery system in the future.

Reducing Microbiological Adhesion on Aluminum by Using Silver Nanocrystals Encapsulated in Mesoporous Silica Nanoparticles

2011 ◽  
Vol 236-238 ◽  
pp. 1775-1778 ◽  
Author(s):  
Li Hua Dong ◽  
Tao Liu ◽  
Li Zhang ◽  
Yan Sheng Yin
Keyword(s):  
Electron Microscopy ◽  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Marine Bacterium ◽  
Mesoporous Silica Nanoparticles ◽  
Plate Count ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Bacterial Growth Curve ◽  
Plate Count Method

In the present study, we report the preparation of silver nanocrystals encapsulated in mesoporous silica nanoparticles (Ag-MSN) with increased stability and enhanced anti-bacterial potency. The morphology of the nanoparticles was characterized by scanning electron microscopy and transmission electron microscopy. X-ray diffraction analyses proved that the silver nanocrystals were truly embedded in the mesoporous silica nanoparticles. The antibacterial effect of silver nanoparticles was proved by plate count method and bacterial growth curve. Moreover, the marine bacterium V. natriegens showed weak attachment to the aluminum coated with Ag -MSN. The mechanism of reducing microbiological adhesion was also discussed.

Mesoporous Silica Nanoparticles with Controllable Pore Size: Preparation and Drug Release

2013 ◽  
Vol 774-776 ◽  
pp. 536-539
Author(s):  
Yang Wang ◽  
Yan Shan ◽  
Ke Zheng Chen ◽  
Lian Gao
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Mesoporous Silica ◽  
Pore Size ◽  
Silica Nanoparticles ◽  
Surface Area ◽  
Mesoporous Silica Nanoparticles ◽  
High Specific Surface Area ◽  
Transmission Electron ◽  
Uniform Particle Size

Mesoporous silica nanoparticles (MSNs), with controllable pore size at wider range (2-13 nm) and particle size about 100 nm, have been successfully prepared using different templates. N2 adsorptiondesorption isotherms, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to characterize the material. The results showed that the MSNs have high specific surface area, controllable pore-size and the pore volume, and uniform particle size. Their drug delivery properties were investigated. It was found that the amount of loading DOX is increased with surface area, and the multi-release experiments showed that they had a sustained-release property; MSNs with larger pore size had the larger amount of DOX.

Reducing Microbially-Influenced Corrosion on Aluminum by Using Organosiloxane Sol Film with Silver Nanocrystals

2012 ◽  
Vol 463-464 ◽  
pp. 1479-1483 ◽  
Author(s):  
Bing Yin ◽  
Tao Liu ◽  
Li Hua Dong ◽  
Li Zhang ◽  
Yan Sheng Yin
Keyword(s):  
Electron Microscopy ◽  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Electrochemical Impedance ◽  
Mesoporous Silica Nanoparticles ◽  
Microbiologically Influenced Corrosion ◽  
X Ray Diffraction ◽  
Microbially Influenced Corrosion ◽  
Transmission Electron ◽  
Corrosion Resistance Property

Silver nanocrystals were encapsulated in mesoporous silica nanoparticles (Ag-MSN) to increase stability and enhance anti-bacterial potency. The morphology of the nanoparticles was characterized by scanning electron microscopy and transmission electron microscopy. X-ray diffraction analyses proved that the silver nanocrystals were truly embedded in the mesoporous silica nanoparticles. Electrochemical impedance spectroscopy was carried out to evaluate the effect of organosiloxane film containing Ag-MSN on reducing microbiologically influenced corrosion. The excellent corrosion resistance property showed that the sol film containing Ag-MSN could significantly decrease the V. natriegens adhesion and protect the aluminum against microbiological corrosion in seawater.

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 Amine-Functionalized Mesoporous Silica Nanoparticles: A New Nanoantibiotic for Bone Infection Treatment

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Daniel Pedraza ◽  
Jaime Díez ◽  
Isabel Izquierdo-Barba ◽  
Montserrat Colilla ◽  
María Vallet-Regí
Keyword(s):  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Chemical Properties ◽  
Bone Infection ◽  
Bacterial Biofilm ◽  
Functionalized Mesoporous Silica ◽  
Transmission Electron ◽  
Infection Treatment ◽  
Physical And Chemical

AbstractThis manuscript reports an effective new alternative for the management of bone infection by the development of an antibiotic nanocarrier able to penetrate bacterial biofilm, thus enhancing antimicrobial effectiveness. This nanosystem, also denoted as “nanoantibiotic”, consists in mesoporous silica nanoparticles (MSNs) loaded with an antimicrobial agent (levofloxacin, LEVO) and externally functionalized with N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (DAMO) as targeting agent. This amine functionalization provides MSNs of positive charges, which improves the affinity towards the negatively charged bacteria wall and biofilm. Physical and chemical properties of the nanoantibiotic were studied using different characterization techniques, including Xray diffraction (XRD), transmission electron microscopy (TEM), N

scholarly journals Evaluating biological activity of folic acid-modified and 10-hydroxycamptothecin-loaded mesoporous silica nanoparticles

2021 ◽  
Author(s):  
Mei-Xia Zhao ◽  
Di-Feng Chen ◽  
Xue-Jie Zhao ◽  
Lin-Song Li ◽  
Yong-Fang Liu
Keyword(s):  
Folic Acid ◽  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Folate Receptor ◽  
Mesoporous Silica Nanoparticles ◽  
Drug Carriers ◽  
Transmission Electron ◽  
Before And After ◽  
Drug Efficiency

Targeted nanocarrier can selectively deliver anti-tumor drugs to cancer sites improving drug efficiency. Accordingly, a targeted nanocarrier (MSN-FA) was synthesized based on folic acid (FA) modified mesoporous silica nanoparticles (MSNs). These loaded with 10-hydroxycamptothecin (HCPT) to obtain the nano-drug MSN-FA@HCPT. These nanocarriers were characterized by transmission electron microscopy (TEM), zeta potential, ultraviolet-visible spectroscopy (UV-Vis), fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analysis (TGA). Notably, the nanocarriers were nearly spherical before and after loading HCPT and exhibited good dispersibility. Also, folate receptor (FR) over-expressing HeLa cells and FR deficient HepG2 cells were used to evaluate in vitro cellular uptake and cytotoxicity of MSN-FA@HCPT and MSN@HCPT. Interestingly, FA-modified nanocarriers enhanced the cytotoxicity of HCPT by improving drug targeting to tumor cells. Also, apoptotic and mitochondrial membrane potential (MMP) reducing effects of MSN-FA@HCPT were more prominent than the MSNs without FA modification. MSN-FA@HCPT can be excellent drug carriers with profound biomedical applications.

scholarly journals Investigating Methylene Blue Removal from Aqueous Solution by Cysteine-Functionalized Mesoporous Silica

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Abeer M. Beagan
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Methylene Blue ◽  
Mesoporous Silica ◽  
Mesoporous Silica Nanoparticles ◽  
Influential Factors ◽  
Functionalized Mesoporous Silica ◽  
Transmission Electron ◽  
Pseudo Second Order ◽  
The Stöber Method

In this study, mesoporous silica nanoparticles (MSNs) were synthesised using the Stober method and functionalised with cysteine (MSN-Cys) for removal of Methylene Blue (MB) from aqueous solution using the batch method. The adsorbent nanoparticles were characterised by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), FTIR, BET, and TGA. Several influential factors on the adsorption of MB onto the surface of MSN-Cys particles were investigated, including pH, initial concentration, and contact time. The adsorption capacity of MB from aqueous solution increased from circa 70 mg/g MSN-Cys in acidic media to circa 140 mg/g MSN-Cys in basic media. Adsorption isotherms and kinetic models of adsorption were used to clarify the adsorption process. The measured adsorption isotherm was fitted with a Freundlich model for all solutions, and the kinetic model was determined to be pseudo-second-order.

scholarly journals Polyelectrolyte-Stabilised Magnetic-Plasmonic Nanocomposites

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1044
Author(s):  
Shelley Stafford ◽  
Coralie Garnier ◽  
Yurii Gun’ko
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Nanocomposite Materials ◽  
Biological Applications ◽  
Polystyrene Sulfonate ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Allylamine Hydrochloride ◽  
Plasmonic Nanocomposite ◽  
Positively Charged

In this work, new magnetic-plasmonic nanocomposites have been developed through the use of two complementary polyelectrolytes–polystyrene sulfonate (PSS) and poly(allylamine hydrochloride) (PAH). PSS, a negatively charged polyelectrolyte, was utilized as a stabiliser for magnetite nanoparticles, and PAH, a positively charged polyelectrolyte, was used to stabilize gold nanoparticles. The combination of these two entities resulted in a magnetic-plasmonic nanocomposite that is highly reproducible and scalable. This approach was found to work for a variety of PSS concentrations. The produced magnetic-plasmonic nanomaterials have been characterized by vibrational sample magnetometry (VSM), transmission electron microscopy (TEM) and UV-Vis spectroscopy. These nanocomposite materials have the potential to be used in a variety of biological applications including bioseparation and biosensing.

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