Synthesis of large gold nanoparticles with deformation twinnings by one-step seeded growth with Cu(ii)-mediated Ostwald ripening for determining nitrile and isonitrile groups

Nanoscale ◽  
2020 ◽  
Vol 12 (32) ◽  
pp. 16934-16943
Author(s):  
Chenshuo Wu ◽  
Hongpeng He ◽  
Yahui Song ◽  
Cuixia Bi ◽  
Lixiang Xing ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Ostwald Ripening ◽  
Seeded Growth ◽  
Growth Method ◽  
One Step

Gold nanoparticles with deformation twinnings prepared by a Cu2+-assisted one-step seeded growth method can distinguish nitrile and isonitrile groups by SERS.

Green Synthesis of 10 nm Gold Nanoparticles via Seeded-Growth Method and its Conjugation Properties on Lateral Flow Immunoassay

2013 ◽  
Vol 686 ◽  
pp. 8-12 ◽  
Author(s):  
Rabizah Makhsin Siti ◽  
Abdul Razak Khairunisak ◽  
Abdul Aziz Azlan ◽  
Rahmah Noordin
Keyword(s):  
Gold Nanoparticles ◽  
Low Cost ◽  
Hydroxylamine Hydrochloride ◽  
Trisodium Citrate ◽  
Reducing Agent ◽  
Lateral Flow ◽  
Lateral Flow Immunoassay ◽  
Seeded Growth ◽  
Vis Spectroscopy ◽  
Growth Method

In this work, 10 nm gold nanoparticles (AuNPs) was successfully synthesized via seeded-growth method. The green chemically synthesis of this AuNPs becomes attractive because the growth process does not involve heat. Moreover, this technique has advantages of quick, simple, and low cost process. Sodium borohydrate (NaBH4) was used as a reducing agent while trisodium citrate was used as a source of OH- ions in the seed stage. Hydroxylamine hydrochloride (NH4.3H2O) was used as a slow reducing agent to enlarge 4 nm seeds to 10 nm AuNPs. A 4 ml AuNPs seed was the optimized volume to produce 10 nm AuNPs with great homogeneity and dispersity. A sharp peak of surface plasmon resonance (SPR) measurement at 517 nm proved that 10 nm AuNPs was successfully synthesized via this method. Optical properties of the seeds and grown AuNPs were analyzed using UV-Vis spectroscopy while size and surface morphology were observed using a transmission electron microscopy (TEM). Particle size distribution was measured using Zetasizer. 10 nm AuNPs was then conjugated with streptavidin and goat anti-human IgA. Depending on type of protein, 10 µg/ml of streptavidin and 11.2 µg/ml of goat anti-human IgA were required to conjugate with 10 nm AuNPs. The produced products had binding capability on lateral flow immunoassay (LFI). A few nanometer red-shifted absorption spectrum of 10 nm AuNPs conjugated protein revealed successful conjugation instead of agglomeration. 1% BSA was determined as the optimum concentration to stabilize 10 nm AuNPs conjugated biomolecules.

Rapid, Non-Toxic Synthesis of Beta Zeolites

2018 ◽  
Author(s):  
Felix Hemmann ◽  
Jonathan Hackebeil ◽  
Andreas Lißner ◽  
Florian Mertens
Keyword(s):  
Hydrofluoric Acid ◽  
Molecular Sieves ◽  
Toxic Chemicals ◽  
Lewis Acidity ◽  
Beta Zeolite ◽  
Seeded Growth ◽  
Related Research ◽  
Beta Zeolites ◽  
Growth Method ◽  
Fast Synthesis

Molecular sieves with beta zeolite topology are promising catalysts for various reactions as they exhibits extraordinary Lewis acidity. However, their industrial application and related research in academica is hindered because their synthesis is time consuming and typically involves toxic chemicals as hydrofluoric acid. Therefore, tetraethylammonium fluorid was tested as a non-toxic fluotide source for the synthesis of beta zeolites. In combination with the previously reported nano-seeded growth method, a fast synthesis of beta zeolites only involving non-toxic chemicals was possible. Synthesized zeolites show comparable selectivity in the Bayer-Villinger oxidation as conventional zeolites synthesized with hydrofluoric acid.<br>

Preparation of hollow Fe3O4 spheres through a facile method and their applications

2017 ◽  
Vol 10 (06) ◽  
pp. 1750075 ◽  
Author(s):  
Xingping Wu ◽  
Aiping Zhu ◽  
Zhaodong Nan
Keyword(s):  
Saturation Magnetization ◽  
Ostwald Ripening ◽  
Solvothermal Method ◽  
Hollow Spheres ◽  
Hollow Structure ◽  
Solid Sphere ◽  
Small Particles ◽  
Potential Applications ◽  
One Step ◽  
Solid Spheres

Fe3O4 hollow microspheres with good dispersibility and high saturation magnetization were synthesized through a facile one-step solvothermal method. The formation mechanism of the hollow structure was studied by taking time-dependent experiments. Porous [Formula: see text]-FeOOH and [Formula: see text]-Fe2O3 nanosheets were firstly fabricated. Fe3O4 solid spheres aggregated by small particles were obtained from the transition of [Formula: see text]-FeOOH and [Formula: see text]-Fe2O3. Finally, the solid sphere is transferred to hollow sphere through Ostwald ripening. The maximum saturation magnetization of the hollow spheres is [Formula: see text][Formula: see text]emu/g, which is higher than some results reported in references. The Fe3O4 hollow spheres show potential applications in microwave absorption and photocatalysis.

Pt-porous ZnO nanoribbon hybrid materials with enhanced catalytic performances

CrystEngComm ◽  
2015 ◽  
Vol 17 (8) ◽  
pp. 1765-1768 ◽  
Author(s):  
Zhiqiang Cheng ◽  
Mingyue Yu ◽  
Guixia Yang ◽  
Lijuan Kang
Keyword(s):  
Photocatalytic Degradation ◽  
Co Oxidation ◽  
Hybrid Materials ◽  
Catalytic Properties ◽  
Seeded Growth ◽  
Hybrid Nanomaterial ◽  
Growth Method ◽  
Catalytic Applications ◽  
Catalytic Performances

With the help of bio-molecule l-lysine, a seeded growth method has been developed and Pt–ZnO porous nanoribbons have been successfully obtained. For the catalytic applications of CO oxidation and the photocatalytic degradation of MO, the hybrid nanomaterial exhibits remarkably enhanced catalytic properties.

X-ray computed tomography contrast agents prepared by seeded growth of gold nanoparticles in PEGylated dendrimer

2010 ◽  
Vol 21 (24) ◽  
pp. 245104 ◽  
Author(s):  
Chie Kojima ◽  
Yasuhito Umeda ◽  
Mikako Ogawa ◽  
Atsushi Harada ◽  
Yasuhiro Magata ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Gold Nanoparticles ◽  
Contrast Agents ◽  
Seeded Growth ◽  
X Ray ◽  
X Ray Computed

scholarly journals Computed Tomography Imaging Agent Based on Gold Nanoparticles for Internal Iliac Artery Embolization after Endovascular Abdominal Aortic Repair and CCN3 Protection Mechanism

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Siying Pei ◽  
Yao Sun ◽  
Dongxu Fan ◽  
Shuhua Deng ◽  
Haoran Mei ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Near Infrared ◽  
Infrared Region ◽  
Fluorescent Properties ◽  
Protection Mechanism ◽  
Abdominal Aortic ◽  
Infrared Rays ◽  
Growth Method ◽  
Internal Iliac ◽  
Endovascular Abdominal Aortic Repair

Abdominal aortic aneurysm is more stressful and has more complications in many diseases. During treatment and repair, arteriosclerosis, abdominal congestion deposition, and abdominal swelling cannot be eliminated. In this paper, we used the seed growth method to obtain gold nanoparticles (AuNPs) with good morphology and dispersion. The AuNPs of larger aspect ratio synthesized in this experiment moved their longitudinal plasmon resonance absorption peak to the near-infrared region, which provided suitable materials for subsequent experiments and laid the foundation for the photothermal therapy of tumors. Experiments show that near-infrared rays can penetrate into deep tissues to overcome the shortcomings that visible light cannot penetrate abdominal aorta well. AuNPs absorb near-infrared rays, thereby generating heat energy to achieve the purpose of treating tumors. In addition, AuNPs also have fluorescent properties, combined with other forms of imaging methods, to achieve the purpose of multimodal imaging, and improve the diagnostic accuracy of studying the protection mechanism of the nephroblastoma overexpressed (NOV or CCN3) gene.

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