Study of Polyacrylate Sizing Agents Modified by Ethanol/PSt and Nano-TiO2/PSt Core-Shell Hybrid Particles

2011 ◽  
Vol 332-334 ◽  
pp. 902-907 ◽  
Author(s):  
Xiao Jin ◽  
Jian Wei Cui
Keyword(s):  
Breaking Strength ◽  
High Surface ◽  
Sol Gel ◽  
Miniemulsion Polymerization ◽  
Adhesive Force ◽  
Nano Particles ◽  
Core Shell ◽  
Hybrid Particles ◽  
Sizing Agents ◽  
Two Hybrid

This paper stated the preparation of nano-TiO2 via Sol-Gel method and modification of nano-TiO2 by coupling agent—MPS. Then Ethanol/PSt and nano-TiO2/PSt core-shell hybrid particles were prepared via miniemulsion polymerization by using the cationic surfactant Cetyl Trimethylammonium Bromide as emulsifier and Cyclohexane as co-stabilizer. These two hybrid nano-particles were added to the sizing agent—SX-5 respectively, to determine the sizing agents’ adhesive force to Terylene (T) and Terylene/Cotton (T/C) yarns respectively via roving method. The breaking strength and hairiness number of T/C yarns were determined by single yarns’ sizing method. The adhesive force of T and T/C yarns, breaking strength and hairiness number of T/C ones, showed that small size effect, high fluidity, and high surface energy caused by large specific surface area of hybrid nano-latices would make a great contribution to sizing properties.

Preparation and Characterization of Magnetic Functional Hybrid Particles

2011 ◽  
Vol 101-102 ◽  
pp. 918-921
Author(s):  
Hui Ying Wen ◽  
Hai Feng Fang ◽  
Shen Ling Xiao
Keyword(s):  
Magnetite Nanoparticles ◽  
Magnetic Particles ◽  
Miniemulsion Polymerization ◽  
Polystyrene Latex ◽  
Composite Particles ◽  
Core Shell ◽  
Hybrid Particles ◽  
Latex Particles ◽  
Shell Particles ◽  
Shell Composite

Hybrid microspheres with a polystyrene core coated with magnetite nanoparticles were prepared by two techniques. Firstly, monodispersed functional polystyrene latex particles were prepared by emulsion polymerization. In a general way chemical groups may be introduced through polymerizable surfactant or functional monomer. Magnetite acidic or alkaline sol was added in, then magnetite nanoparticles were absorbed onto latex particles by electrostatic attraction and core-shell composite particles were formed. Secondly, core-shell composite particles were prepared by miniemulsion polymerization. To modify the tendency of conglomeration of magnetite and increase the amount of magnetic particles onto the composite particles, silane coupling agent MPS was used as surface modification agent for magnetite. A series of different size and coating morphology magnetic hybrid particles were prepared through the adjustment of some experiment parameters. The obtained functional core-shell particles were characterized by FTIR, TEM, etc.

High surface area neodymium phosphate nano particles by modified aqueous sol–gel method

2011 ◽  
Vol 46 (12) ◽  
pp. 2373-2377 ◽  
Author(s):  
Sasidharan Sankar ◽  
Krishna Gopakumar Warrier ◽  
Rajesh Komban
Keyword(s):  
Surface Area ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Nano Particles ◽  
Gel Method ◽  
Sol Gel Method

Study of Organic/Inorganic Hybrid Nanoparticles in Sizing Agents for Mechanism and Effect of Fiber Adhesion

2013 ◽  
Vol 821-822 ◽  
pp. 511-517
Author(s):  
Huan Wang ◽  
Xiao Jin ◽  
Jian Wei Cui
Keyword(s):  
Polyacrylic Acid ◽  
Adhesion Force ◽  
Solid Content ◽  
Nano Particles ◽  
Hybrid Nanoparticles ◽  
Hybrid Particles ◽  
C Fibers ◽  
Slip Resistance ◽  
Silica Dioxide ◽  
Sizing Agents

This paper stated the preparation of nano-modified polyacrylic acid sizing agents by adding self-made hybridized nano-TiO2(titanium dioxide)/PSt(Polystyrene) and nano-SiO2(silica dioxide)/PSt emulsion respectively into self-made polyacrylic acid sizing agents which called SW. Influences of two kinds of nano hybrid particles in nano-modified SW with different dosages on the strength of sizing yarns and mechanisms of increasing adhesion were analyzed. Experimental results showed that: 1. when two kinds of nano particles’ weight was about 1.1% of SW solid content, adhesion force of nano-modified sizing agents with Terylene/Cotton(T/C)fibers will reach the maximum,while when the weight of nano particles were less than 1.1% or more than 1.1%, the adhesion force between sizes and (T/C)fibers increased obviously or declined evidently; 2. scanning electronic microscope(SEM) photograph of roving chips displayed that fibers’ surface were completely covered by smooth size film and many hybrid nanoparticles between macromolecules of sizes, thus engendering huge bonding force between sizes and fibers, and increasing the slip resistance between fibers.

Electron holography of catalysts

1995 ◽  
Vol 53 ◽  
pp. 416-417
Author(s):  
A. K. Datye ◽  
D. S. Kalakkad ◽  
L. F. Allard ◽  
E. Völkl
Keyword(s):  
Heterogeneous Catalysts ◽  
High Surface ◽  
High Surface Area ◽  
Atomic Scale ◽  
Nano Particles ◽  
Phase Image ◽  
Electron Holography ◽  
Specimen Thickness ◽  
Phase Information ◽  
Particle Structure

The active phase in heterogeneous catalysts consists of nanometer-sized metal or oxide particles dispersed within the tortuous pore structure of a high surface area matrix. Such catalysts are extensively used for controlling emissions from automobile exhausts or in industrial processes such as the refining of crude oil to produce gasoline. The morphology of these nano-particles is of great interest to catalytic chemists since it affects the activity and selectivity for a class of reactions known as structure-sensitive reactions. In this paper, we describe some of the challenges in the study of heterogeneous catalysts, and provide examples of how electron holography can help in extracting details of particle structure and morphology on an atomic scale.Conventional high-resolution TEM imaging methods permit the image intensity to be recorded, but the phase information in the complex image wave is lost. However, it is the phase information which is sensitive at the atomic scale to changes in specimen thickness and composition, and thus analysis of the phase image can yield important information on morphological details at the nanometer level.

The Stabilization of Supported Au Nanoparticles in a Highly Sintering Environment using High Surface Free Energy Pt and Ru Cores

2021 ◽  
Author(s):  
Kerry O-Connell ◽  
John R Monnier ◽  
John Regalbuto
Keyword(s):  
Gold Nanoparticles ◽  
Free Energy ◽  
Surface Free Energy ◽  
Au Nanoparticles ◽  
High Surface ◽  
Chemical Environment ◽  
Core Shell

In an effort to stabilize gold nanoparticles which sinter rapidly in a highly corrosive chemical environment, the hydrochlorination of acetylene, bimetallic Ru@Au and Pt@Au core-shell catalysts were prepared by anchoring...

scholarly journals Bifunctional acid–base mesoporous silica@aqueous miscible organic-layered double hydroxides

RSC Advances ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 3749-3754 ◽  
Author(s):  
Hongri Suo ◽  
Haohong Duan ◽  
Chunping Chen ◽  
Jean-Charles Buffet ◽  
Dermot O'Hare
Keyword(s):  
Mesoporous Silica ◽  
Pore Size ◽  
Layered Double Hydroxides ◽  
High Surface ◽  
High Surface Area ◽  
Core Shell ◽  
Acid Base ◽  
Double Hydroxides ◽  
Hierarchical Morphology ◽  
Size And Structure

Core@shell materials which exhibit hierarchical morphology with ultra high surface area and controllable pore size and structure have been synthesised.

High-Surface-Area Alumina-Silica Nanocatalysts Prepared by a Hybrid Sol-Gel Route Using a Boehmite Precursor

2010 ◽  
Vol 93 (12) ◽  
pp. 4047-4052 ◽  
Author(s):  
Padmaja Parameswaran Nampi ◽  
Padmanabhan Moothetty ◽  
Wilfried Wunderlich ◽  
Frank John Berry ◽  
Michael Mortimer ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area

Synthesis and structural characteristics of high surface area TiO2 aerogels by ultrasonic-assisted sol–gel method

2018 ◽  
Vol 29 (7) ◽  
pp. 075702 ◽  
Author(s):  
Feng Qingge ◽  
Cai Huidong ◽  
Lin Haiying ◽  
Qin Siying ◽  
Liu Zheng ◽  
...  
Keyword(s):  
Surface Area ◽  
Structural Characteristics ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ultrasonic Assisted

Synergistic Effect of Eu3+ and Sm3+ Co-Doping on Photocatalytic Activity of TiO2 Nanoparticles

2011 ◽  
Vol 197-198 ◽  
pp. 891-894 ◽  
Author(s):  
Cheng Zhi Jiang ◽  
Xu Dong Lu
Keyword(s):  
Photocatalytic Activity ◽  
Synergistic Effect ◽  
Sol Gel ◽  
Blue Shift ◽  
Nano Particles ◽  
Absorption Profile ◽  
Co Doping ◽  
The Matrix ◽  
Co Doped ◽  
The Eu

Pure TiO2, Eu3+and Sm3+co-doping TiO2composite nanoparticles have been prepared by sol-gel method and characterized by the techniques such as XRD, SEM and DRS. The photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate their photocatalytic activity. The matrix distortion of TiO2nano-particles increases after co-doping of Eu3+and Sm3+and a blue-shift of the absorption profile are clearly observed. The results show that co-doping of Eu3+and Sm3+inhibits the phase transformation of TiO2from anatase to rutile, decreases the diameter of TiO2nano-particles and significantly enhance the photocatalytic activity of TiO2. The Eu3+and Sm3+co-doped into TiO2nano-particles exert a synergistic effect on their photocatalytic activity.

Study on the Use of Rhodamine Doped Nanocomposite for Latent Fingerprint Detection

2011 ◽  
Vol 295-297 ◽  
pp. 813-816 ◽  
Author(s):  
Li Liu
Keyword(s):  
High Surface ◽  
Sol Gel ◽  
Volume Ratio ◽  
Molecular Complexes ◽  
Optical Devices ◽  
Chemical Compositions ◽  
Loading Capacity ◽  
Optical And Mechanical Properties ◽  
Fluorescent Compounds ◽  
Fingerprint Detection

Silicon dioxide-based nanocomposites offer large loading capacity for various doping chemicals or molecular complexes, high surface to volume ratio and customizable surface chemistry for the creation and development of novel sensors and devices [1-2]. When compared with other sol-gel materials, xerogels represent a class of nanocomposites that are relatively easy to fabricate but with unique thermal, acoustic, optical and mechanical properties for rapid sensor or device prototyping development [3-4]. Xerogels in solids are formed by controlled evaporation of the liquid in the hydro-gel. Their porosity and morphology depend largely on the temperature, gel chemical compositions and pH in the fabrication process. When impregnated with fluorescent compounds in their nanosize cavities, the doped xerogels exhibit strong and stable fluorescence properties that are useful for the developing of ion-exchange sensors and optical devices. However, the use of these fluorescently doped xerogels in forensic applications was still largely unexplored.

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