Synthesis and Enhanced Colloidal Stability of Cationic Gold Nanoparticles using Polyethyleneimine and Carbon Dioxide

2013 ◽  
Vol 1 (7) ◽  
pp. 826-832 ◽  
Author(s):  
Fiaz S. Mohammed ◽  
Scott R. Cole ◽  
Christopher L. Kitchens
Keyword(s):  
Carbon Dioxide ◽  
Gold Nanoparticles ◽  
Colloidal Stability ◽  
Cationic Gold

Seed-mediated synthesis and PEG coating of gold nanoparticles for controlling morphology and sizes

MRS Advances ◽  
2020 ◽  
Vol 5 (63) ◽  
pp. 3353-3360
Author(s):  
Susana Helena Arellano Ramírez ◽  
Perla García Casillas ◽  
Christian Chapa González
Keyword(s):  
Gold Nanoparticles ◽  
Polyethylene Glycol ◽  
Room Temperature ◽  
Colloidal Stability ◽  
Infrared Spectrometry ◽  
Ammonium Bromide ◽  
Chloroauric Acid ◽  
Vis Spectroscopy ◽  
Seed Mediated ◽  
Peg Coating

AbstractA significant area of research is biomedical applications of nanoparticles which involves efforts to control the physicochemical properties through simple and scalable processes. Gold nanoparticles have received considerable attention due to their unique properties that they exhibit based on their morphology. Gold nanospheres (AuNSs) and nanorods (AuNRs) were prepared with a seed-mediated method followed of polyethylene glycol (PEG)-coating. The seeds were prepared with 0.1 M cetyltrimethyl-ammonium bromide (CTAB), 0.005 M chloroauric acid (HAuCl4), and 0.01 M sodium borohydride (NaBH4) solution. Gold nanoparticles with spherical morphology was achieved by growth by aggregation at room temperature, while to achieve the rod morphology 0.1 M silver nitrate (AgNO3) and 0.1 M ascorbic acid solution were added. The gold nanoparticles obtained by the seed-mediated synthesis have spherical or rod shapes, depending on the experimental conditions, and a uniform particle size. Surface functionalization was developed using polyethylene glycol. Morphology, and size distribution of AuNPs were evaluated by Field Emission Scanning Electron Microscopy. The average size of AuNSs, and AuNRs was 7.85nm and 7.96 x 31.47nm respectively. Fourier transform infrared spectrometry was performed to corroborate the presence of PEG in the AuNPs surface. Additionally, suspensions of AuNSs and AuNRs were evaluated by UV-Vis spectroscopy. Gold nanoparticles were stored for several days at room temperature and it was observed that the colloidal stability increased once gold nanoparticles were coated with PEG due to the shield formed in the surface of the NPs and the increase in size which were 9.65±1.90 nm of diameter for AuNSs and for AuNRs were 29.03±5.88 and 8.39±1.02 nm for length and transverse axis, respectively.

Preparation of Cationic Gold Nanoparticles for Gene Delivery

2008 ◽  
Vol 2 (2) ◽  
pp. 152-156 ◽  
Author(s):  
Guoping Chen ◽  
Michiaki Takezawa ◽  
Naoki Kawazoe ◽  
Tetsuya Tateishi
Keyword(s):  
Gold Nanoparticles ◽  
Gene Delivery ◽  
Cationic Gold

A highly efficient ligand exchange reaction on gold nanoparticles: preserving their size, shape and colloidal stability

RSC Advances ◽  
2014 ◽  
Vol 4 (64) ◽  
pp. 34217-34220 ◽  
Author(s):  
Melissa R. Dewi ◽  
Geoffry Laufersky ◽  
Thomas Nann
Keyword(s):  
Gold Nanoparticles ◽  
Solvent Extraction ◽  
Exchange Reaction ◽  
Ligand Exchange ◽  
Colloidal Stability ◽  
Ligand Exchange Reaction ◽  
Highly Efficient

Almost complete ligand exchange and excellent colloidal stability of gold nanoparticles can be achieved by a new solvent extraction based method.

Highly Dispersive Gold Nanoparticles on Carbon Black for Oxygen and Carbon Dioxide Reduction

2018 ◽  
Vol 30 (12) ◽  
pp. 2861-2868 ◽  
Author(s):  
Yeomin Kim ◽  
Ara Jo ◽  
Yejin Ha ◽  
Yongjin Lee ◽  
Dongil Lee ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Gold Nanoparticles ◽  
Carbon Black ◽  
Carbon Dioxide Reduction

Triggered drug release from hybrid thermoresponsive nanoparticles using near infrared light

Nanomedicine ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 219-234 ◽  
Author(s):  
Isabel Ortiz de Solorzano ◽  
Martin Prieto ◽  
Gracia Mendoza ◽  
Victor Sebastian ◽  
Manuel Arruebo
Keyword(s):  
Drug Delivery ◽  
Gold Nanoparticles ◽  
Colloidal Stability ◽  
Near Infrared ◽  
Chemical Characterization ◽  
Infrared Light ◽  
Galvanic Replacement ◽  
Heating Efficiency ◽  
Hollow Gold Nanoparticles

Aim: Developing hybrid poly(N-isopropylacrylamide)-based nanogels decorated with plasmonic hollow gold nanoparticles for on-demand drug delivery and their physico-chemical characterization, bupivacaine loading and release ability upon light irradiation, and in vitro cell viability. Materials & methods: Hollow gold nanoparticles were prepared by galvanic replacement reaction; poly(N-isopropylacrylamide)-based nanogels were synthesized via precipitation polymerization and their electrostatic coupling was accomplished using poly(allylamine hydrochloride) as cationic polyelectrolyte linker. Results & conclusion: Colloidal stability of the resulted hybrid nanovectors was demonstrated under physiological conditions together with their fast response and excellent heating efficiency after light stimulation, indicating their potential use as triggered drug-delivery vectors. Moreover, their influence on cell metabolism and cell cycle under subcytotoxic doses were studied showing excellent cytocompatibility.

Direct Metallization of Gold Nanoparticles on a Polystyrene Bead Surface using Cationic Gold Ligands

2007 ◽  
Vol 28 (5) ◽  
pp. 634-640 ◽  
Author(s):  
Jun-Ho Lee ◽  
Dong Ouk Kim ◽  
Gyu-Seok Song ◽  
Youngkwan Lee ◽  
Seung-Boo Jung ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Polystyrene Bead ◽  
Bead Surface ◽  
Cationic Gold

Supramolecular protection-mediated one-pot synthesis of cationic gold nanoparticles

2020 ◽  
Vol 81 ◽  
pp. 303-308 ◽  
Author(s):  
Batakrishna Jana ◽  
Seongchan Kim ◽  
Huyeon Choi ◽  
Seongeon Jin ◽  
Kibeom Kim ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
One Pot ◽  
One Pot Synthesis ◽  
Cationic Gold
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