scholarly journals Size-Controlled Preparation of Gold Nanoparticles Deposited on Surface-Fibrillated Cellulose Obtained by Citric Acid Modification

ACS Omega ◽  
2020 ◽  
Vol 5 (51) ◽  
pp. 33206-33213
Author(s):  
Threeraphat Chutimasakul ◽  
Yuta Uetake ◽  
Jonggol Tantirungrotechai ◽  
Taka-aki Asoh ◽  
Hiroshi Uyama ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Citric Acid ◽  
Acid Modification ◽  
Controlled Preparation ◽  
Size Controlled

scholarly journals Size-Controlled Preparation of Gold Nanoparticles Deposited on Surface-Fibrillated Cellulose obtained by Citric Acid-Modification

2020 ◽  
Author(s):  
Chutimasakul Threeraphat ◽  
Yuta Uetake ◽  
Jonggol Tantirungrotechai ◽  
Taka-Aki Asoh ◽  
Hiroshi Uyama ◽  
...  
Keyword(s):  
Particle Size ◽  
Citric Acid ◽  
Aerobic Oxidation ◽  
Functional Materials ◽  
Deposition Efficiency ◽  
Acid Modification ◽  
Au Nps ◽  
Size Growth ◽  
Controlled Preparation ◽  
Hydroxy Groups

<p>Cellulose-based functional materials have gained immense interest due to its low density, hydrophilicity, chirality, and degradability. So far, a facile and scalable preparation of fibrillated cellulose by treating the hydroxy groups of cellulose with citric acid (F-CAC) have been developed, and applied as a reinforcing filler for polypropylene composite. Herein, a size-selective preparation of Au nanoparticles (NPs) stabilized by F-CAC is described. By modifying the conditions of trans-deposition method, established in our group previously, a transfer of Au NPs from poly(<i>N</i>-vinyl-2-pyrrolidone) (PVP) to F-CAC proceeded up to 96% transfer efficiency with retaining its cluster sizes in EtOH. Meanwhile, the deposition efficiency drastically decreased in the case of non-modified cellulose, showing the significance of citric acid-modification. A shift of binding energy at Au 4f core level X-ray photoelectron microscopy (XPS) from 82.0 eV to 83.3 eV indicated that the NPs were stabilized on a F-CAC surface rather than by PVP matrix. The reproducible particle size growth was observed when 2-propanol was used as a solvent instead of EtOH, expanding the range of the available particle size with simple manipulation. The thus-obtained Au:F-CAC nanocatalysts exhibited a catalytic activity toward an aerobic oxidation of 1-indonol in toluene to yield 1-indanone quantitatively, and were recyclable at least 6 times, illustrating high tolerance against organic solvents.</p>

Size-controlled preparation of gold nanoparticles with novel pH responsive gemini amphiphiles

2015 ◽  
Vol 3 (24) ◽  
pp. 6334-6340 ◽  
Author(s):  
Li Cheng ◽  
Xuefeng Li ◽  
Jinfeng Dong
Keyword(s):  
Gold Nanoparticles ◽  
Au Nanoparticles ◽  
Phase Transfer ◽  
Ph Sensitive ◽  
Ph Responsive ◽  
Gemini Amphiphiles ◽  
Controlled Preparation ◽  
Size Controlled

Novel pH sensitive Di-CnPh gemini amphiphiles can act as both the phase-transfer reagent and stabilizer to make extremely small Au nanoparticles.

scholarly journals Size-controlled preparation of fluorescent gold nanoparticles using pamoic acid

Gold Bulletin ◽  
2015 ◽  
Vol 48 (1-2) ◽  
pp. 85-92 ◽  
Author(s):  
Md. Abdul Aziz ◽  
Jong-Pil Kim ◽  
M. Nasiruzzaman Shaikh ◽  
Munetaka Oyama ◽  
Fatai Olawale Bakare ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Pamoic Acid ◽  
Controlled Preparation ◽  
Size Controlled

scholarly journals Size-Controlled Preparation of Gold Nanoparticles Deposited on Surface-Fibrillated Cellulose obtained by Citric Acid-Modification

2020 ◽  
Author(s):  
Chutimasakul Threeraphat ◽  
Yuta Uetake ◽  
Jonggol Tantirungrotechai ◽  
Taka-Aki Asoh ◽  
Hiroshi Uyama ◽  
...  
Keyword(s):  
Particle Size ◽  
Citric Acid ◽  
Aerobic Oxidation ◽  
Functional Materials ◽  
Deposition Efficiency ◽  
Acid Modification ◽  
Au Nps ◽  
Size Growth ◽  
Controlled Preparation ◽  
Hydroxy Groups

<p>Cellulose-based functional materials have gained immense interest due to its low density, hydrophilicity, chirality, and degradability. So far, a facile and scalable preparation of fibrillated cellulose by treating the hydroxy groups of cellulose with citric acid (F-CAC) have been developed, and applied as a reinforcing filler for polypropylene composite. Herein, a size-selective preparation of Au nanoparticles (NPs) stabilized by F-CAC is described. By modifying the conditions of trans-deposition method, established in our group previously, a transfer of Au NPs from poly(<i>N</i>-vinyl-2-pyrrolidone) (PVP) to F-CAC proceeded up to 96% transfer efficiency with retaining its cluster sizes in EtOH. Meanwhile, the deposition efficiency drastically decreased in the case of non-modified cellulose, showing the significance of citric acid-modification. A shift of binding energy at Au 4f core level X-ray photoelectron microscopy (XPS) from 82.0 eV to 83.3 eV indicated that the NPs were stabilized on a F-CAC surface rather than by PVP matrix. The reproducible particle size growth was observed when 2-propanol was used as a solvent instead of EtOH, expanding the range of the available particle size with simple manipulation. The thus-obtained Au:F-CAC nanocatalysts exhibited a catalytic activity toward an aerobic oxidation of 1-indonol in toluene to yield 1-indanone quantitatively, and were recyclable at least 6 times, illustrating high tolerance against organic solvents.</p>

Size Controlled Synthesis of 2-6 nm Gold Nanoparticles via Controlling Concentration of the Reducing Agent and Temperature

2012 ◽  
Vol 557-559 ◽  
pp. 572-576 ◽  
Author(s):  
Wei Luo ◽  
Fei Wang ◽  
Xue Ao Zhang ◽  
Zheng Zheng Shao ◽  
Jing Yue Fang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Reducing Agent ◽  
Controlled Synthesis ◽  
Key Factors ◽  
Facile Synthesis ◽  
Au Nps ◽  
Size Dependent ◽  
Octyl Amine ◽  
Controlled Preparation ◽  
Size Controlled

We reported a facile synthesis route for size controlled preparation of gold nanoparticles (Au NPs) by controlling concentration of the reducing agent and temperature. Nearly monodisperse Au NPs with mean diameters of 2-6 nm are acquired via the reduction of HAuCl4by NaBH4in the presence of tri-n-octyl amine and dodecanethiol in solvent of toluene. Results indicate that concentration of the reducing agent and temperature are key factors to tune the particle size and uniformity in the synthesis of Au NPs. The as-synthesized Au NPs show size dependent surface plasmonic properties between 510 and 525 nm, while Au NPs with size smaller than 3 nm do not clearly show the property.

scholarly journals Reuse of Newspaper As An Adsorbent For Cu (II) Removal By Citric Acid Modification

2018 ◽  
Vol 156 ◽  
pp. 02012 ◽  
Author(s):  
Mardiah ◽  
Rif’an Fathoni ◽  
Pratiwi Pudyaningtyas ◽  
Hamdania Gamu ◽  
Rinaldy
Keyword(s):  
Citric Acid ◽  
Adsorption Process ◽  
Kinetic Studies ◽  
Order Reaction ◽  
Acid Modification ◽  
Pseudo First Order Reaction ◽  
First Order ◽  
Pseudo Second Order ◽  
Heavy Metal Adsorbent ◽  
The Impact

High Consumption of paper, bring the impact of the waste paper itself. And the utilization of the paper is limited to recycled products and crafts, whereas paper such as newspaper still contains cellulose that can be potential to be used as a heavy metal adsorbent. In this study, newspaper was dissolved in sodium bicarbonate to reduce various impurities and then was reacted with citric acid (CA). The modified adsorbent was characterized by FTIR and was tested for adsorb Cu(II) in artificial solution. After adsorption process, the solution was filtered and analysed using Atomic Absorption Spectrophotometer (AAS). The adsorption experimental data was fitted to Langmuir, Freundlich, Tempkin, and Dubinin-Radushkevich for equilibrium model and was fitted to pseudo first order reaction and pseudo second order reaction for kinetic studies. The result showed that CA-modification newspaper able to remove heavy metals Cu(II) in solution.

Facile, size-controlled deposition of highly dispersed gold nanoparticles on nitrogen carbon nanotubes for hydrogen sensing

2011 ◽  
Vol 160 (1) ◽  
pp. 1034-1042 ◽  
Author(s):  
Abu Z. Sadek ◽  
Vipul Bansal ◽  
Dougal G. McCulloch ◽  
Paul G. Spizzirri ◽  
Kay Latham ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Hydrogen Sensing ◽  
Highly Dispersed ◽  
Controlled Deposition ◽  
Size Controlled ◽  
Dispersed Gold
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