scholarly journals Application of the nanoindentation method in assessing of properties of cement composites modified with silica-magnetite nanostructures

2018 ◽  
Vol 163 ◽  
pp. 02002 ◽  
Author(s):  
Elzbieta Horszczaruk ◽  
Roman Jedrzejewski ◽  
Jolanta Baranowska ◽  
Ewa Mijowska
Keyword(s):  
Mechanical Properties ◽  
Magnetite Nanoparticles ◽  
Positive Influence ◽  
Cement Matrix ◽  
Core Shell ◽  
Indentation Modulus ◽  
Cement Composites ◽  
Interfacial Zone ◽  
Berkovich Indenter ◽  
The Core

The results of investigation of the cement composites modified with 5% of silica-magnetite nanostructures of the core-shell type are presented in the paper. The nanoindentation method employing three-sided pyramidal Berkovich indenter was used in the research. The mechanical properties and microstructure of the modified cement composites were evaluated on the basis of the values of hardness and indentation modulus measured inside the cement matrix and in the aggregate-paste interfacial zone. The results were compared with those obtained for the reference composites without nanostructures. The positive influence of the presence of silica-magnetite nanoparticles on the tested properties was found out.

scholarly journals Preparation and Mechanical Properties of Graphene Oxide: Cement Nanocomposites

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Fakhim Babak ◽  
Hassani Abolfazl ◽  
Rashidi Alimorad ◽  
Ghodousi Parviz
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Graphene Oxide ◽  
Cement Mortar ◽  
Cement Matrix ◽  
Cement Composites ◽  
Xrd Diffraction ◽  
Calcium Silicate Hydrates ◽  
The Matrix ◽  
Scanning Electron

We investigate the performance of graphene oxide (GO) in improving mechanical properties of cement composites. A polycarboxylate superplasticizer was used to improve the dispersion of GO flakes in the cement. The mechanical strength of graphene-cement nanocomposites containing 0.1–2 wt% GO and 0.5 wt% superplasticizer was measured and compared with that of cement prepared without GO. We found that the tensile strength of the cement mortar increased with GO content, reaching 1.5%, a 48% increase in tensile strength. Ultra high-resolution field emission scanning electron microscopy (FE-SEM) used to observe the fracture surface of samples containing 1.5 wt% GO indicated that the nano-GO flakes were well dispersed in the matrix, and no aggregates were observed. FE-SEM observation also revealed good bonding between the GO surfaces and the surrounding cement matrix. In addition, XRD diffraction data showed growth of the calcium silicate hydrates (C-S-H) gels in GO cement mortar compared with the normal cement mortar.

Design of PP/EPDM/NBR TPVs with tunable mechanical properties via regulating the core-shell structure

2020 ◽  
Vol 90 ◽  
pp. 106767
Author(s):  
Tao Peng ◽  
Fei Lv ◽  
Zhou Gong ◽  
Liming Cao ◽  
Xuesong Yan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shell Structure ◽  
Core Shell ◽  
The Core ◽  
Core Shell Structure ◽  
Tunable Mechanical Properties

Encapsulation of Magnetic Particles in Metallic Hollow Nanospheres

2001 ◽  
Vol 704 ◽  
Author(s):  
M. Toprak ◽  
D. K. Kim ◽  
M. Mikhailova ◽  
Y. Zhang ◽  
Y. K. Jeong ◽  
...  
Keyword(s):  
Magnetite Nanoparticles ◽  
Electroless Deposition ◽  
Magnetic Particles ◽  
Second Step ◽  
Core Shell ◽  
Hollow Nanospheres ◽  
Coating Solution ◽  
Porous Gold ◽  
The Core ◽  
Core Shell Structure

AbstractNovel metallic capsules containing magnetite with given size in the sub-micron range have been produced. These nanocapsules are prepared in several steps through a colloidal templating approach. The first step is the synthesis of size-selected SiO2 nanospheres. The second step is coating the SiO2nanospheres by electroless deposition with gold, in order to form a porous gold shell around the silica. Electroless deposition is controlled by the concentration of gold in the coating solution. Subsequently, the core (SiO2) was removed to obtain gold capsules. The final step is the inclusion of magnetite nanoparticles inside these nanocapsules and recoating the capsules with gold in order to have continuous encapsulation. The nanocapsule and core-shell structure have been characterized by TEM and DSC

scholarly journals Investigate the mechanical properties of Si/Ge (Ge/Si) core-shell nanowires: A molecular dynamics study

2020 ◽  
Vol 3 (4) ◽  
pp. first
Author(s):  
Vuong Van Thanh ◽  
Tran The Quang ◽  
Nguyen Tuan Hung ◽  
Vu Le Huy ◽  
Do Van Truong
Keyword(s):  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Elastic Modulus ◽  
Lattice Mismatch ◽  
Chemical Properties ◽  
Core Shell ◽  
The Core ◽  
Axial Tensile ◽  
Physical And Chemical ◽  
And Chemical Properties

Nanowires (NWs) have been used increasingly in practice due to their outstanding mechanical, physical, and chemical properties. In this paper, we use the molecular dynamics (MD) method to investigate the mechanical properties of NWs (Si/Ge, Ge/Si) with a core-shell structure under the axial tensile strain along the <100>/{100} direction. Our results show that the strength and elastic modulus of Ge/Si and Si/Ge NWs depend on the composition and size of the core/shell crosssection. The strength and strain of Ge/Si NW decrease with increasing the size of the core crosssection because of the lattice mismatch between two layers of core/shell materials. The elastic modulus of Ge/Si NWs increases with the increasing the size of the core cross-section, while the elastic modulus of the Si/Ge NW decreases. In addition, the theoretical strength and elastic modulus of Ge/Si NWs reduce with the growth of the temperature. Furthermore, we also investigate the effect of strain rate on the mechanical properties of the Ge/Si NWs. The obtained results of the study provide the intrinsic properties of the core-shell NWs and also help in the design and fabrication of electronic and optical devices based on the Ge/Si NWs.

Core–shell nanospheres to achieve ultralow friction polymer nanocomposites with superior mechanical properties

Nanoscale ◽  
2019 ◽  
Vol 11 (17) ◽  
pp. 8237-8246 ◽  
Author(s):  
Lin Zhang ◽  
Yilong Ren ◽  
Shiguang Peng ◽  
Dan Guo ◽  
Shizhu Wen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polymer Nanocomposites ◽  
Core Shell ◽  
Mechanical Mixing ◽  
Ultralow Friction ◽  
The Core ◽  
Superior Mechanical Properties ◽  
Lubrication Properties ◽  
Friction Polymer

The mechanical and lubrication properties of the core–shell nanocomposite show great advantages over those of conventional composites prepared by mechanical mixing.

Mechanical properties of Ge/Si core-shell nanowires under a uniaxial tension

2006 ◽  
Vol 958 ◽  
Author(s):  
Y. Yano ◽  
T. Nakajima ◽  
K. Shintani
Keyword(s):  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Dynamics Simulation ◽  
Single Atom ◽  
Core Shell ◽  
The Core ◽  
Young’S Moduli ◽  
Vegard’S Law ◽  
Shell Nanowires

ABSTRACTThe mechanical properties of Si/Ge core-shell nanowires under a unixial tension are studied using molecular-dynamics simulation. The effects of anisotropy and the fraction of the core atoms on the Young's moduli of the core-shell nanowires are examined. The values of their Young's moduli deviate from those calculated using Vegard's law. Single atom chains are formed at the final stages of elongation of the nanowires.

Research of Properties and Preparation on Zero-VOC Acrylic Elastic Emulsion

2010 ◽  
Vol 150-151 ◽  
pp. 745-748 ◽  
Author(s):  
Qian Xu ◽  
Shao Guo Wen ◽  
Hong Bo Liu ◽  
Ji Hu Wang ◽  
Yan Shen
Keyword(s):  
Mechanical Properties ◽  
Potential Application ◽  
Core Shell ◽  
Functional Monomer ◽  
Mass Ratio ◽  
Acrylic Emulsion ◽  
Elongation At Break ◽  
The Core ◽  
Coating Industry ◽  
High Elongation

The core-shell acrylic emulsion was synthesized，with P(MMA/BA) as core，and with P(2-EHA/MBA/HPA) as shell. The influence of the mass ratio of core/shell on mechanical properties was investigated in detail. The high elongation at break proved that the emulsion may have a potential application in coating industry, afforded by HPA as functional monomer. However, when the amount of HPA exceeds 1.5 wt. % to the total monomers, the emulsion will become unstable and precipitation occurs.

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