Effect of Polyvinylpyrrolidone on the Preparation of Silver Nanowires

Polyvinylpyrrolidone (PVP) has been used to control size and shape of metal nanoparticles in aqueous solution, where PVP plays the dual role of protective and reducing agent. The influence of PVP with different molecular weight on the aspect ratio of nanorods and nanowires during a classical polyol process was studied. Nanowires with higher aspect ratio were obtained by using PVP with higher molecular weight. It is suggested that the reduction rate is decreased with an increase of the molecular weight of PVP, leading to the growth of nanowires with higher aspect ratio.

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Investigation into the role of poly(vinylpyrrolidone) in the growth of high aspect ratio silver nanowires

Inorganic Chemistry Communications ◽

10.1016/j.inoche.2021.108558 ◽

2021 ◽

Vol 128 ◽

pp. 108558

Author(s):

Yuyue Guo ◽

Yangfei Hu ◽

Xiaojiong Luo ◽

Shudong Lin ◽

Jiwen Hu ◽

...

Keyword(s):

Aspect Ratio ◽

High Aspect Ratio ◽

Silver Nanowires

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Complexation of arsenate to humic acid with different molecular weight fractions in aqueous solution

Journal of Environmental Science and Health Part A ◽

10.1080/10934529.2021.2006544 ◽

2021 ◽

pp. 1-7

Author(s):

Shifeng Li ◽

Feng Lu ◽

Hongtao Lv ◽

Yang Zhou ◽

Mario A. Gomez ◽

...

Keyword(s):

Aqueous Solution ◽

Molecular Weight ◽

Humic Acid ◽

Molecular Weight Fractions ◽

Different Molecular Weight

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Research and Application of Polycarboxylic Acid Water Reducer with Different Molecular Weight

E3S Web of Conferences ◽

10.1051/e3sconf/202017901021 ◽

2020 ◽

Vol 179 ◽

pp. 01021

Author(s):

Bobo Liu ◽

Kangjian Yu ◽

Yinggang Yang ◽

Donghui Miao ◽

Chong He

Keyword(s):

Molecular Weight ◽

Polyethylene Glycol ◽

Reducing Agent ◽

Acid Water ◽

Low Molecular Weight ◽

High Grade ◽

Polycarboxylic Acid ◽

Different Molecular Weight

In this paper, a polycarboxylic water reducing agent was synthesized by using Methylallyl polyethylene glycol (HPEG) with molecular weight of 1200, 2400, 2800 and 3400 under the same conditions, C80 concrete tests were performed on these four molecular weight superplasticizers, verify the effect of different molecular weight polycarboxylic acid water reducer in C80 pumping concrete, finally, a kind of low molecular weight polycarboxylic acid water reducer with viscosity reducing effect in high-grade concrete is obtained, which can promote pumping of high-grade concrete.

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Imidazole catalyzed silica synthesis: Progress toward understanding the role of histidine in (bio)silicification

Journal of Materials Research ◽

10.1557/jmr.2009.0223 ◽

2009 ◽

Vol 24 (5) ◽

pp. 1700-1708 ◽

Cited By ~ 20

Author(s):

Mei-Keat Liang ◽

Siddharth V. Patwardhan ◽

Elena N. Danilovtseva ◽

Vadim V. Annenkov ◽

Carole C. Perry

Keyword(s):

Molecular Weight ◽

Silicic Acid ◽

Catalytic Mechanism ◽

Synthetic Polymers ◽

Precipitation Process ◽

Silica Precipitation ◽

Silica Synthesis ◽

Different Molecular Weight

Histidine is an amino acid present in proteins involved in biosilica formation and often found in peptides identified during phage display studies but its role(s) and the extent of its involvement in the silica precipitation process is not fully understood. In this contribution we describe results from an in vitro silicification study conducted using poly-histidine (P-His) and a series of different molecular weight synthetic polymers containing the imidazole functionality (polyvinylimidazole, PVI) for comparison. We show that the presence of imidazole from PVI or P-His is able to catalyze silicic acid condensation; the effect being greater for P-His. The catalytic mechanism is proposed to involve the dual features of the imidazole group—its ability to form hydrogen bonds with silicic acid and electrostatic attraction toward oligomeric silicic acid species.

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Comprehensive Synthesis Study of Well-Dispersed and Solution-Processed Metal Nanowires for Transparent Heaters

Journal of Nanomaterials ◽

10.1155/2018/7304807 ◽

2018 ◽

Vol 2018 ◽

pp. 1-13 ◽

Cited By ~ 6

Author(s):

Marco Bobinger ◽

Vasileios Dergianlis ◽

Markus Becherer ◽

Paolo Lugli

Keyword(s):

Aspect Ratio ◽

Silver Nitrate ◽

Potassium Chloride ◽

Power Density ◽

Process Parameters ◽

Silver Nanowires ◽

Process Time ◽

Metal Nanowires ◽

Solution Processed

We review and extend the numerous polyol-based synthesis protocols and postdeposition treatments that have been reported for silver nanowires (AgNWs). After tailoring substantial process parameters such as the process time, temperature as well as the stirring speed, the polyvinylpyrrolidone (PVP) to silver nitrate (AgNO3) ratio, and the type of PVP, a high mean aspect ratio of 800 could be achieved. Interestingly, the addition of a small portion of potassium chloride (KCl) not only leads to a reduction in diameter but also extremely enhances the nanowire dispersion and its stability. This effect is attributed to the role of KCl, which, along with PVP, acts as a cocapping agent. Furthermore, sprayed AgNW and copper nanowire (CuNW) films were tested as transparent heaters. The AgNWs could be operated at a power density of at least 0.72 W/cm2, which corresponds to a temperature of 213°C, whereas the CuNWs failed at a power density and temperature of 0.4 W/cm2 and 150°C, respectively. Interestingly, the degradation of AgNWs shows a step-wise behavior and is mainly dominated by fragmentation, while the CuNWs are gradually oxidized.

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