scholarly journals A uniform few-layered carbon coating derived from self-assembled carboxylate monolayers capable of promoting the rate properties and durability of commercial TiO2

RSC Advances ◽  
2019 ◽  
Vol 9 (62) ◽  
pp. 36334-36342 ◽  
Author(s):  
Meng Huang ◽  
Hui-Ling Zhu ◽  
Yong-Xin Qi ◽  
Ning Lun ◽  
Yu-Jun Bai
Keyword(s):  
Carbon Coating ◽  
Cycling Performance ◽  
Carboxyl Groups ◽  
Affinity Adsorption ◽  
High Affinity ◽  
Thin Carbon ◽  
Self Assembled ◽  
Commercial Tio2

The uniform and thin carbon-coating formed on c-TiO2 particles by virtue of the high-affinity adsorption of TiO2 for carboxyl groups results in superior rate and cycling performance.

Phenothiazine-Bridged Cyclic Porphyrin Dimers as High-Affinity Hosts for Fullerenes and Linear Array of C60 in Self-Assembled Porphyrin Nanotube

2014 ◽  
Vol 79 (7) ◽  
pp. 2980-2992 ◽  
Author(s):  
Ken-ichi Sakaguchi ◽  
Takuya Kamimura ◽  
Hidemitsu Uno ◽  
Shigeki Mori ◽  
Shuwa Ozako ◽  
...  
Keyword(s):  
Linear Array ◽  
High Affinity ◽  
Self Assembled ◽  
Porphyrin Dimers

Enhancing Cyclic Performance and Rate Capability of Li4Ti5O12for Lithium-Ion Batteries through Thin Carbon Coating

2018 ◽  
Vol 3 (38) ◽  
pp. 10792-10798 ◽  
Author(s):  
Xingkang Huang ◽  
Ren Ren ◽  
Niraj K. Singh ◽  
Meenakshi Hardi ◽  
Junhong Chen
Keyword(s):  
Lithium Ion Batteries ◽  
Carbon Coating ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cyclic Performance ◽  
Thin Carbon

scholarly journals Waterborne polyurethane as a carbon coating for micrometre-sized silicon-based lithium-ion battery anode material

2018 ◽  
Vol 5 (8) ◽  
pp. 180311 ◽  
Author(s):  
Chunfeng Yan ◽  
Tao Huang ◽  
Xiangzhen Zheng ◽  
Cuiran Gong ◽  
Maoxiang Wu
Keyword(s):  
Carbon Coating ◽  
Lithium Ion ◽  
Waterborne Polyurethane ◽  
Cycling Performance ◽  
Capacity Retention ◽  
Lithium Ions ◽  
Rate Capacity ◽  
Silicon Based ◽  
Carbon Network ◽  
A Current

Waterborne polyurethane (WPU) is first used as a carbon-coating source for micrometre-sized silicon. The remaining nitrogen (N) and oxygen (O) heteroatoms during pyrolysis of the WPU interact with the surface oxide on the silicon (Si) particles via hydrogen bonding (Si–OH⋯N and Si–OH⋯O). The N and O atoms involved in the carbon network can interact with the lithium ions, which is conducive to lithium-ion insertion. A satisfactory performance of the Si@N, O-doped carbon (Si@CNO) anode is gained at 25 and 55°C. The Si@CNO anode shows stable cycling performance (capacity retention of 70.0% over 100 cycles at 25°C and 60.3% over 90 cycles at 55°C with a current density of 500 mA g −1 ) and a superior rate capacity of 864.1 mA h g −1 at 1000 mA g −1 (25°C). The improved electrochemical performance of the Si@CNO electrode is attributed to the enhanced electrical conductivity and structural stability.

scholarly journals Self assembled nanocages from DNA–protoporphyrin hybrid molecules

RSC Advances ◽  
2015 ◽  
Vol 5 (108) ◽  
pp. 89025-89029 ◽  
Author(s):  
Vandana Singh ◽  
Mohan Monisha ◽  
Roy Anindya ◽  
Prolay Das
Keyword(s):  
Functional Groups ◽  
Protoporphyrin Ix ◽  
Building Blocks ◽  
Carboxyl Groups ◽  
Dna Oligomers ◽  
Organic Hybrid ◽  
Molecular Building Blocks ◽  
Modified Dna ◽  
Hybrid Molecules ◽  
Self Assembled

DNA–organic hybrid molecular building blocks are generated by covalent conjugation of the carboxyl groups of protoporphyrin IX with the amine functional groups of modified DNA oligomers.

STRUCTURE ACTIVITY RELATIONSHIPS OF DERMATAN SULFATE : EFFECT OF MOLECULAR SIZE AND CARBOXYL GROUP ESTERIFICATION ON HEPARIN C0FACT0R-II ACTIVATION

1987 ◽  
Author(s):  
J Mardiguian ◽  
M Corgier ◽  
M Jouany
Keyword(s):  
Molecular Weight ◽  
Dermatan Sulfate ◽  
Methyl Esters ◽  
Molecular Size ◽  
Carboxyl Groups ◽  
Gel Chromatography ◽  
Carboxyl Group ◽  
Heparin Cofactor Ii ◽  
High Affinity

Dermatan is a high molecular weight glycosaminoglycan which has been shown to enhance the inhibition of thrombin by heparin-cofactor II. The aim of this study was to establish the influence of the molecular size and the role of the carboxyl group on the in vitro activity of Dermatan Sulfate. Pig skin Dermatan Sulfate was fractionated according to molecular size by gel-chromatography on Ultrogel Ac 44. Each fraction was characterized by its sulfur content and by its mean molecular weight measured on a TSK - 4000 column in reference to standard heparin fractions. Methyl esters of the unfractionated Dermatan Sulfate with varying degree of esterification, where prepared via activation of the carboxyl groups with a carbodiimide and reaction with methanol. The results of this study show that the heparin - cofactor II mediated anti-thrombin activity of Dermatan Sulfate is increasing with the molecular weight and is abolished by esterification of the carboxyl groups. Moreover, it can be speculated that each fraction contains the same amount of high affinity fraction and that, like heparin, the potency of the high affinity component is increasing with the molecular weight.

Determination of Ultra-Thin Carbon Coating Thickness by X-ray Fluorescence Technique

1988 ◽  
Vol 32 ◽  
pp. 331-339
Author(s):  
R. L. White ◽  
T. C. Huang
Keyword(s):  
Film Thickness ◽  
Carbon Coating ◽  
Layer Structure ◽  
Carbon Film ◽  
Calibration Procedure ◽  
High Precision Measurement ◽  
X Ray ◽  
Thin Carbon ◽  
Counting Time

AbstractA tcchniquc for high-precision measurement of carbon thin-film thickness using X-ray fluorescence (XRF) is described. A quadratic calibration procedure is used for carbon thin films on silicon. Measurement of carbon-film thickness in a double-layer structure of carbon and CoCrX alloy is complicated by interference effects from the underlying layer. The dependence of the relative precision in measuring thickness (σT/T) on the counting time has been derived. It shows that a precision of 2% for a 25-nm carbon coating can be obtained using a W/C crystal and counting time of 4 minutes. Intensity and resolution advantages provided by the recently developed Ni/C and V/C multilayer synthetic crystals are also described.

scholarly journals Synthesis of Nanocobalt Powders for an Anode Material of Lithium-Ion Batteries by Chemical Reduction and Carbon Coating

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Seong-Hyeon Hong ◽  
Yeong-Mi Jin ◽  
Kyung Tae Kim ◽  
Cheol-Woo Ahn ◽  
Dong-Su Park ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Anode Material ◽  
Carbon Coating ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Chemical Reduction Method ◽  
The Third ◽  
Carbon Coated

Nanosized Co powders were prepared by a chemical reduction method with and without CTAB (cetyltrimethylammonium bromide,C19H42BrN) and carbon-coating heat treatment at 700°C for 1 h, and the electrochemical properties of the prepared nanosized Co powders were examined to evaluate their suitability as an anode material of Li-ion batteries. Nanosized amorphous Co-based powders could be synthesized by a chemical reduction method in which a reducing agent is added to a Co ion-dissolved aqueous solution. When the prepared nanosized Co-based powders were subjected to carbon-coating heat treatment at 700°C for 1 h, the amorphous phase was crystallized, and a Co single phase could be obtained. The Co-based powder prepared by chemical reduction with CTAB and carbon-coating heat treatment had a smaller first discharge capacity (about 557 mAh/g) than the Co-based powder prepared by chemical reduction without CTAB and carbon-coating heat treatment (about 628 mAh/g). However, the former had a better cycling performance than the latter from the third cycle. The carbon-coated layers are believed to have led to quite good cycling performances of the prepared Co-based powders from the third cycle.

The oxidation behavior and magnetic properties of iron carbonitride ultrafine particles

1996 ◽  
Vol 11 (11) ◽  
pp. 2689-2692
Author(s):  
X. Q. Zhao ◽  
Y. Liang ◽  
Z. Q. Hu ◽  
B. X. Liu
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Ultrafine Particles ◽  
Carbon Coating ◽  
Oxidation Behavior ◽  
Structural Characteristics ◽  
Iron Nitride ◽  
Thin Carbon ◽  
Surface Morphologies

Iron nitride and iron carbonitride (ICN) ultrafine particles (20–80 nm in size) have been synthesized by laser-induced pyrolysis of the Fe(CO)5–NH3–C2H4 system. The oxidation behavior, surface morphologies, and structural characteristics as well as magnetic properties of these particles are reported and discussed. It is found that the presence of very thin carbon coating (1–2 nm) on the ICN particles plays an important role in preventing the oxidation of the particles. Accordingly, the ICN ultrafine particles exhibit higher saturation magnetization (142 emu/g) than the iron nitride ones (124 emu/g).

scholarly journals Electrochemical properties of a silicon nanoparticle/hollow graphite fiber/carbon coating composite as an anode for lithium-ion batteries

RSC Advances ◽  
2017 ◽  
Vol 7 (58) ◽  
pp. 36735-36743 ◽  
Author(s):  
Liyong Wang ◽  
Zhanjun Liu ◽  
Quangui Guo ◽  
Xiaohui Guo ◽  
Jianjun Gu
Keyword(s):  
Lithium Ion Batteries ◽  
Carbon Coating ◽  
Silicon Nanoparticles ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Graphite Fiber ◽  
Lithium Storage ◽  
Silicon Nanoparticle ◽  
Coating Composite ◽  
Graphite Fibers

Hollow graphite fibers and carbon coating were applied to improve lithium storage and cycling performance of silicon nanoparticles.

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