Syntheses and characterization of nanometer-sized semiconductor clusters

Wang, Y.; Herron, Norman

doi:10.1163/156856791x00093

Cited by 36 publications

(14 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Nanoparticles are increasingly investigated for their potential to increase the bioactivity and reduce the unwanted therapeutic side effects. , Recently, bio- and nanotechnologies have been combined to establish a new generation of cancer treatments, , bringing about a critical therapeutic group of nanoparticle-based drugs . As a result, researchers are examining a broad variety of nanoparticles for their potential advantages and disadvantages as therapeutics. , …”

Section: Introductionmentioning

confidence: 99%

“…5 As a result, researchers are examining a broad variety of nanoparticles for their potential advantages and disadvantages as therapeutics. 1,6 Recently, the incorporation of selenium (Se) into nanoparticles has attracted much attention because of its ability to promote tumor cell apoptosis. Se can sensitize tumor cells to antitumor drugs.…”

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Delivery of Sesamol Using Polyethylene-Glycol-Functionalized Selenium Nanoparticles in Human Liver Cells in Culture

Liu

et al. 2019

J. Agric. Food Chem.

View full text Add to dashboard Cite

Anticancer nanoparticles were fabricated by linking the nanoparticles of two known anticancer agents, sesamol and selenium, using polyethylene glycol (PEG). The successful fabrication of the sesamol−PEG−selenium nanoparticles (PEG−SeNPs), which had a sesamol loading efficiency of 10.0 ± 0.5 wt %, was demonstrated using different spectroscopic techniques. The impact of the nanoparticles on model cancer cells (HepG2) was established using the cell activity test, morphological observation, and fluorescent staining, which all showed that nanoparticles effectively inhibited the HepG2 cells. 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assays showed that the concentration of the sample that inhibits 50% of the cells of PEG−SeNPs and sesamol−PEG−SeNPs on HepG2 cells was 413.8 and 68.7 μg/mL, respectively, which indicated the synergistic inhibition between sesamol and selenium nanoparticles. Furthermore, flow cytometry showed that sesamol−PEG−SeNPs exhibited higher apoptosis than either sesamol or PEG−SeNPs alone. Finally, western blot confirmed that the apoptostic ability of sesamol−PEG−SeNPs was associated with downregulation of Bcl-2 and procaspase-3, upregulation of Bax and PARP, and discharge of cytochrome c into the cytosol. Our findings suggest the novel sesamol nanoparticles may be efficient anticancer agents.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Delivery of Sesamol Using Polyethylene-Glycol-Functionalized Selenium Nanoparticles in Human Liver Cells in Culture

Liu

et al. 2019

J. Agric. Food Chem.

View full text Add to dashboard Cite

show abstract

“…rials. [11][12][13][14][15][16][17][18][19][20] In these cases, the pore size limits particle growth.…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition of [M3(CO)12] (M=Ru, Os) physisorbed onto porous Vycor glass: a route to a glass/RuO2 nanocomposite

Zarbin¹,

Vargas²,

Alves³

1999

J. Mater. Chem.

View full text Add to dashboard Cite

This paper reports the preparation and characterization of oxide/glass nanocomposites, obtained by the impregnation and thermal decomposition of the trinuclear metal carbonyl clusters [M 3 (CO) 12 ] (M=Ru, Os) inside the pores of porous Vycor glass (PVG). The intermediate species formed during the thermal treatment of the [M 3 (CO) 12 ] adsorbed PVG materials were studied by UV-VIS-NIR and diffuse reflectance infrared (DR-IR) spectroscopy. At 65°C (M=Ru) and 110°C (M=Os), formation of surface bound [ HM 3 (CO) 10 (m-OSiM)] species occurs, as a result of oxidative addition of a PVG surface silanol group to a cluster MM bond. At T >130°C (M= Ru) and T >200°C (M=Os) cluster breakdown is observed, with formation of [M(CO) n (OSiM) 2 ] (n=2 and/or 3) species. When [Ru 3 (CO) 12 ] incorporated PVG is heated in air at T >250°C, decomposition of the cluster and formation of RuO 2 nanoparticles are observed. At 1200°C, collapse of the glass pores leads to the formation of a transparent silica glass/RuO 2 nanocomposite of particle average size 45 Å. tially pure silica with interconnecting pores of narrow size

show abstract

“…Current lithographic technology cannot achieve the resolution necessary to synthesize size-quantized II−VI materials, such as CdS and CdSe, since their exciton diameters are less than 100 Å. , Synthesis methods that employ polymers, glasses, zeolites, inverse micelles, capping molecules, or coordinating solvents to arrest or control particle growth remain the only means to produce size-quantized II−VI semiconductor nanoparticles. Unfortunately these approaches have limitations as well; polymers and glasses yield size-polydisperse materials, , and zeolites limit nanocrystal diameters to pore dimensions, which typically are in the vicinity of 15 Å. , Usage of stabilizing agents, which cap particles and thereby control crystal growth, has led to the most promising of current technologies for the production of large quantities of monodisperse nanocrystals that may be suitable for some important optoelectronic device applications.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Size-Monodisperse CdS Nanocrystals Using Phosphatidylcholine Vesicles as True Reaction Compartments

1996

View full text Add to dashboard Cite

Phosphatidylcholine vesicles provide reaction compartments for synthesis of size-quantized CdS nanocrystals of dimension predicted to within 2.5 Å on the basis of initial encapsulated CdCl2 concentration and vesicle diameter. Vesicle formation by detergent dialysis of phosphatidylcholine/hexylglucoside mixed micelles yields highly monodisperse lipid capsules within which monodisperse CdS nanoparticles are precipitated with sulfide. Size-quantized CdS nanocrystals, with diameters ranging from 20 to 60 Å, have been produced with typical standard deviations about the mean diameter of ±8%, as measured by transmission electron microscopy. Spectrophotometric and photoluminescence spectra are consistent with highly crystalline, monodisperse particles with few core or surface defects. Measured exciton energies show excellent agreement with data in the literature. The empirical pseudopotential model presented by Krishna and Friesner for a cubic CdS lattice, correcting for experimentally measured lattice contractions, best fits the exciton energy versus particle diameter data.

show abstract

Syntheses and characterization of nanometer-sized semiconductor clusters

Cited by 36 publications

References 43 publications

Delivery of Sesamol Using Polyethylene-Glycol-Functionalized Selenium Nanoparticles in Human Liver Cells in Culture

Delivery of Sesamol Using Polyethylene-Glycol-Functionalized Selenium Nanoparticles in Human Liver Cells in Culture

Thermal decomposition of [M3(CO)12] (M=Ru, Os) physisorbed onto porous Vycor glass: a route to a glass/RuO2 nanocomposite

Synthesis of Size-Monodisperse CdS Nanocrystals Using Phosphatidylcholine Vesicles as True Reaction Compartments

Contact Info

Product

Resources

About