scholarly journals Carbon Nanoparticles and Materials on Their Basis

2020 ◽  
Vol 4 (4) ◽  
pp. 42
Author(s):  
Alina A. Kokorina ◽  
Alexey V. Ermakov ◽  
Anna M. Abramova ◽  
Irina Yu. Goryacheva ◽  
Gleb B. Sukhorukov
Keyword(s):  
Carbon Nanoparticles ◽  
Luminescent Properties ◽  
Structure Characterization ◽  
Synthetic Methods ◽  
Charge Ratio ◽  
Separation And Purification ◽  
Uniform Size ◽  
Porous Microparticles ◽  
Controllable Release

Carbon nanoparticles (CNPs) are novel nanostructures with luminescent properties. The development of CNPs involves the elaboration of various synthetic methods, structure characterization, and different applications. However, the problems associated with the CNP structure definition and properties homogeneity are not solved and barely described in depth. In this feature article, we demonstrate the approaches for the effective separation and purification of CNPs by size and size/charge ratio. We propose a promising way for the synthesis of the uniform-size structures by the application of calcium carbonate porous microparticles as reactors with defined size. Additionally, the application of the CNPs agglomerates for controllable release systems triggered by light and in-situ synthesis of fluorescent conductive carbonaceous films on the base of polyelectrolyte multilayers are under consideration.

Structure characterization of ground calcium carbonate flocs by fractal analysis and their effects on handsheet properties

TAPPI Journal ◽  
2013 ◽  
Vol 12 (3) ◽  
pp. 17-23 ◽  
Author(s):  
WANHEE IM ◽  
HAK LAE LEE ◽  
HYE JUNG YOUN ◽  
DONGIL SEO
Keyword(s):  
Fractal Analysis ◽  
Structural Characteristics ◽  
Fractal Dimensions ◽  
Strength Loss ◽  
Structure Characterization ◽  
Uniform Size ◽  
Cross Sectional ◽  
Floc Size ◽  
Mass Fractal ◽  
Handsheet Properties

Preflocculation of filler particles before their addition to pulp stock provides the most viable and practical solution to increase filler content while minimizing strength loss. The characteristics of filler flocs, such as floc size and structure, have a strong influence on preflocculation efficiency. The influence of flocculant systems on the structural characteristics of filler flocs was examined using a mass fractal analysis method. Mass fractal dimensions of filler flocs under high shear conditions were obtained using light diffraction spectroscopy for three different flocculants. A single polymer (C-PAM), a dual cationic polymer (p-DADMAC/C-PAM) and a C-PAM/micropolymer system were used as flocculants, and their effects on handsheet properties were investigated. The C-PAM/micropolymer system gave the greatest improvement in tensile index. The mass fractal analysis showed that this can be attributed to the formation of highly dense and spherical flocs by this flocculant. A cross-sectional analysis of the handsheets showed that filler flocs with more uniform size were formed when a C-PAM/micropolymer was used. The results suggest that a better understanding of the characteristics of preflocculated fillers and their influence on the properties of paper can be gained based on a fractal analysis.

scholarly journals Variability and improvement of optical and antimicrobial performances for CQDs/mesoporous SiO2/Ag NPs composites via in situ synthesis

2021 ◽  
Vol 10 (1) ◽  
pp. 403-411
Author(s):  
Youliang Cheng ◽  
Mingjie Wang ◽  
Changqing Fang ◽  
Ying Wei ◽  
Jing Chen ◽  
...  
Keyword(s):  
Uv Light ◽  
Carbon Quantum Dots ◽  
Diffusion Method ◽  
Ag Nps ◽  
Uniform Size ◽  
High Antibacterial Activity ◽  
Fluorescent Materials ◽  
Potential Applications ◽  
Mesoporous Sio2

Abstract To change the optical properties and improve the antibacterial performances of carbon quantum dots (CQDs) and Ag NPs, mesoporous SiO2 spheres were combined with them to form the composites. In this paper, CQDs with a uniform size of about 3.74 nm were synthesized using glucose as carbon source. Then, CQDs/mesoporous SiO2/Ag NPs composites were obtained in situ under UV light irradiating by using mesoporous SiO2 and Ag NO3 as the carrier and silver resource, respectively. The diameter of CQDs/mesoporous SiO2/Ag NPs particles was in the range of 200–250 nm. With the increase in irradiating time, the red-shift in the UV-Vis spectrum for as-prepared CQDs/mesoporous SiO2/Ag NPs composites was found, and the adsorption peak was widened. In addition, the composites showed a high antibacterial activity against Staphylococcus aureus and Escherichia coli via disc diffusion method. These results indicated that inhibition circles for Ag NPs/mesoporous SiO2/CQDs and mesoporous SiO2/Ag NPs were similar in diameter. Furthermore, the two composites had a better bactericidal performance compared with other particles. Therefore, as-prepared CQDs/mesoporous SiO2/Ag NPs composites in this paper have great potential applications for fluorescent materials and antibacterial materials.

Influence of in-situ reaction on luminescent properties of samarium-complex/hydrogenated acrylonitrile-butadiene composites

Polymer ◽  
2009 ◽  
Vol 50 (14) ◽  
pp. 3269-3274 ◽  
Author(s):  
Shipeng Wen ◽  
Xiaoping Zhang ◽  
Shui Hu ◽  
Liqun Zhang ◽  
Li Liu
Keyword(s):  
Luminescent Properties ◽  
In Situ Reaction ◽  
Samarium Complex

scholarly journals Toward a mechanistic understanding of electrocatalytic nanocarbon

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Erik J. Askins ◽  
Marija R. Zoric ◽  
Matthew Li ◽  
Zhengtang Luo ◽  
Khalil Amine ◽  
...  
Keyword(s):  
Spectroscopic Studies ◽  
Synthetic Methods ◽  
Computational Studies ◽  
Molecular Models ◽  
Chemical Production ◽  
True Nature ◽  
Catalytic Mechanisms ◽  
Mechanistic Understanding ◽  
Further Development

AbstractElectrocatalytic nanocarbon (EN) is a class of material receiving intense interest as a potential replacement for expensive, metal-based electrocatalysts for energy conversion and chemical production applications. The further development of EN will require an intricate knowledge of its catalytic behaviors, however, the true nature of their electrocatalytic activity remains elusive. This review highlights work that contributed valuable knowledge in the elucidation of EN catalytic mechanisms. Experimental evidence from spectroscopic studies and well-defined molecular models, along with the survey of computational studies, is summarized to document our current mechanistic understanding of EN-catalyzed oxygen, carbon dioxide and nitrogen electrochemistry. We hope this review will inspire future development of synthetic methods and in situ spectroscopic tools to make and study well-defined EN structures.

Hydrothermal Synthesis and Structure Characterization of Two Hybrid Metal Phosphonates Materials

2015 ◽  
Vol 1088 ◽  
pp. 309-313
Author(s):  
Chang Feng Sun ◽  
Yan Yan Pang ◽  
Ying Zhao ◽  
Yu Yang
Keyword(s):  
Hydrothermal Synthesis ◽  
Structure Characterization ◽  
Hydrothermal Conditions ◽  
Metal Phosphonates ◽  
Two Hybrid

Under hydrothermal conditions, two copper phosphonates, [Cu2(H2O)2(H2L)(bpy)2(H3L)2]·2H2O (1) and [Cu2(H2O)2(H2L)2(phen)2]·6H2O (2) (H4L = p-xylylenediphosphonic acid, bpy = 2,2'-bipyridine and phen = 1,10-phenanthroline), have been synthesized using diethyl p-xylylenediphosphonate (dixdp), in which p-xylylenediphosphonic acid (H4L) was generated via in situ hydrolysis. Complexe 1 forms a zero-dimensional (0D) bimetallic rings, while complex 2 features a 0D structure containing two kinds of partially deprotonated H3L-and H2L2-ligand.

Luminescent properties of Eu(OA)3(TTA)/NBR composites prepared by in-situ reaction

2013 ◽  
Vol 31 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Shui HU ◽  
Shipeng WEN ◽  
Weidong WU ◽  
Li LIU
Keyword(s):  
Luminescent Properties ◽  
In Situ Reaction
Sign in / Sign up

Export Citation Format

Share Document