Parameters and properties for the preparation of Cu nanocolloids containing polyvinyl alcohol using the electrical spark discharge method

Tseng, Kuo-Hsiung; Ke, Han-Chiao; Ku, Hsueh-Chien

doi:10.1177/18479804211035190

Cited by 6 publications

(4 citation statements)

References 30 publications

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“…e PVAcontaining CuNCs PVA/CuNCs were formed by adding polyvinyl alcohol (PVA), which effectively improved the suspension stability (zeta potential of 32.5 mV). When T on : T off is set to 30 : 30 s, the preparation efficiency is the best, and the suspension stability is also the best [1]. Loan et al investigated the cellular effects of platinum nanoparticles (PtNP) and platinum nanocolloids (PtNC) on mouse leukemia Raw 264.7 cells.…”

Section: Related Workmentioning

confidence: 99%

Application of Polymer Nanocolloid Preparation in Stability Analysis of Motion Mechanics

Jia

Sun

2022

Advances in Materials Science and Engineering

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Nanomaterials are widely used in various fields because of their own advantages. When the particle size of the material is reduced to the nanometer level, it will lead to new characteristics of acoustic, optical, electrical, magnetic, and thermal properties. This will greatly enrich the research content of the material and is expected to get new uses. Therefore, the preparation technology of nanomaterials is one of the current research hotspots and has broad application prospects. At present, the most commonly used preparation techniques are hydrothermal method and sol-gel method, but not all crystals grow in a hydrothermal environment, so this paper adopts the sol-gel method for preparation. However, in the preparation of nanocolloids, agglomeration often occurs between colloidal nanoparticles. In order to avoid the agglomeration between particles, this paper adopts an appropriate method to disperse the particles. In order to further explore the stability of nanocolloids, the colloidal film material prepared by the cadmium sulfide (CdS) sol method was used as the research sample. It also proposes a sol preparation method incorporating ultrasonic waves and further discusses the kinetic characteristics. The research results show that the sedimentation velocity of 1 nm cadmium sulfide nanocolloids in water is 1.3 × 10−12 (m/s) prepared by colloid of cadmium sulfide.

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Section: Related Workmentioning

confidence: 99%

Application of Polymer Nanocolloid Preparation in Stability Analysis of Motion Mechanics

Jia

Sun

2022

Advances in Materials Science and Engineering

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“…As shown in Figure a, AMP on the surface of the gold core resulted in a lower negative charge (−4.82 ± 0.23 mV) for the AuNCs, and the surface charge of PVA was found to be −3.41 ± 0.18 mV. With the addition of less than 10 μM PVA, the zeta potential of the AuNCs increased from 4.82 to 22.1 mV, indicating that a stable dispersive system was formed due to electrostatic repulsion; a steric effect between the nanoparticles provided and allowed resistance to the surface attraction between the particles . Therefore, colloids of PVA-coated AuNCs were formed in the assembly process.…”

Section: Resultsmentioning

confidence: 93%

“…With the addition of less than 10 μM PVA, the zeta potential of the AuNCs increased from 4.82 to 22.1 mV, indicating that a stable dispersive system was formed due to electrostatic repulsion; a steric effect between the nanoparticles provided and allowed resistance to the surface attraction between the particles. 39 Therefore, colloids of PVA-coated AuNCs were formed in the assembly process. However, the electrokinetic potential values gradually decreased in the presence of PVA (>10 μM), which indicated that the stable space of nanoparticles in the spherical colloid was destroyed and the concentration of free counterions in the solution decreased; thus, the overall viscosity of the solution increased.…”

Section: The Intrinsic Assembly Mechanism Between Auncs and Pvamentioning

confidence: 99%

Poly(vinyl alcohol)-Coated Au Nanoclusters with High Stability and Quantum Yields of Fluorescence for Application in pH Sensing

Liu

Zang

et al. 2022

ACS Appl. Nano Mater.

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Metal nanoclusters (NCs) have become one of the most promising of the fluorescent nanomaterials. However, it is particularly challenging to prepare NCs with a high quantum yield (QY). Recently, an innovative approach was revealed to improve the QY by using an aggregation-induced emission (AIE) property of specific gold nanoclusters (AuNCs). In this study, an assembly was formed between poly(vinyl alcohol) (PVA) and adenosine 5′monophosphate-capped gold nanoclusters (AuNCs@AMP) to improve the QY of AuNCs from 14.2% to 35.4% with an obvious luminescent, aggregate-induced emission enhancement (AIEE) property. The intrinsic formative mechanism was explored in depth, which indicated that a suspended particulate was formed with AuNCs at a low concentration of PVA, pushing the AuNCs to a less polar environment and greatly enhancing the metal−metal interaction between them, leading to a blueshift. When more PVA was present in the solution, abundant hydrogen bond interactions between the amino groups in AMP and the hydroxide radical groups in PVA restricted the intramolecular rotation and vibration of capping ligands and reduced the non-radiative relaxation of the corresponding excited states. Therefore, immensely dynamic interactions of the assembly populate the radiative decay pathways and accelerate the effective electron transfer, subsequently leading to a higher luminescent intensity. Meanwhile, luminescent enhancement membranes were prepared with extremely stabilized optical properties (monitored for at least 20 months) based on the assembly and applied as a novel fluorescent probe of pH-responsiveness. This study is beneficial for the design principles of highly luminescent AuNC materials with excellent stability and understanding the AIEE mechanism.

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“…Nanometal colloids, such as nanogold, nanosilver, nano-copper, nano-aluminum, and nano-titanium, can be made with any method able to conduct electricity using an EDM [ 26 , 27 , 28 , 29 , 30 ]. Nanosilver colloids have been applied in biomedical research, and silver ions can resist bacteria growth.…”

Section: Methodsmentioning

confidence: 99%

Implementation of Micro-EDM Monitoring System to Fabricate Antimicrobial Nanosilver Colloid

Tseng

Chung

Chiu³

2022

Micromachines

Self Cite

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This study implemented a discharge energy and success-rate monitoring system to replace the traditional oscillograph observation method and conducted a microbial control test for a nanosilver colloid prepared by an Electrical Discharge Machine (EDM). The advantage of this system is that the discharge conditions can be instantly and continuously observed, and the optimized discharge parameter settings can be recorded. The monitoring system can use the arcing rate to control the energy consumption of the electrodes to standardize the nanosilver colloid. The results show that the arcing rate, electrode weight loss, and absorption peak wavelength are very accurate. The nanosilver colloid prepared by EDM is free of any chemical additive, and in comparison to other preparation methods, it is more applicable to biotechnology, even to the human body. The microbial control test for the nanosilver colloid included a Bathroom sample, Penicillium, Aspergillus niger, and Aspergillus flavus. In test solution NO.1 (prepared by micro-EDM), the effects of all four samples were inhibited at 14mm in a metal ring experiment, and in the cotton pad experiment, Penicillium was inhibited at 17 mm. In the metal ring experiment, test solution NO. 2 (prepared by EDM) had an effect at 20 mm on the bathroom samples, but at only 15 mm on flavus. In the cotton pad experiment, the inhibited effect was more effective in Penicillium and Aspergillus Niger; both inhibited effects occurred at 25 mm. Test solutions NO.3 (prepared by micro-EDM) and NO.4 (32 ppm Ag+) had a 14–15 mm effect on all samples in the metal ring experiment. In the cotton pad experiment, NO.3 had an effect on Penicillium at 19 mm while the effect on the others occurred at 14 mm, and NO.4 had an effect at 25 mm in Penicillium and Aspergillus Niger, and only at 14 mm in the bathroom and Aspergillus flavus samples.

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Parameters and properties for the preparation of Cu nanocolloids containing polyvinyl alcohol using the electrical spark discharge method

Cited by 6 publications

References 30 publications

Application of Polymer Nanocolloid Preparation in Stability Analysis of Motion Mechanics

Application of Polymer Nanocolloid Preparation in Stability Analysis of Motion Mechanics

Poly(vinyl alcohol)-Coated Au Nanoclusters with High Stability and Quantum Yields of Fluorescence for Application in pH Sensing

Implementation of Micro-EDM Monitoring System to Fabricate Antimicrobial Nanosilver Colloid

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