Flexible Pt3Ni–S-Deposited Teflon Membrane with High Surface Mechanical Properties for Efficient Solar-Driven Strong Acidic/Alkaline Water Evaporation

2020 ◽  
Vol 12 (24) ◽  
pp. 27140-27149 ◽  
Author(s):  
Tianyue Ma ◽  
Chunyu Yang ◽  
Wei Guo ◽  
Huiming Lin ◽  
Feng Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Surface ◽  
Water Evaporation ◽  
Alkaline Water ◽  
Teflon Membrane

scholarly journals Mechanical Properties of Hybrid Graphene Nanoplatelet-Nanosilica Filled Unidirectional Basalt Fibre Composites

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1468
Author(s):  
Ummu Raihanah Hashim ◽  
Aidah Jumahat ◽  
Mohammad Jawaid
Keyword(s):  
Mechanical Properties ◽  
Polymer Composites ◽  
Glass Fibre ◽  
Graphene Nanosheets ◽  
High Surface ◽  
High Surface Area ◽  
High Strength ◽  
Basalt Fibre ◽  
Graphene Nanoplatelet ◽  
Dispersion State

Basalt fibre (BF) is one of the most promising reinforcing natural materials for polymer composites that could replace the usage of glass fibre due to its comparable properties. The aim of adding nanofiller in polymer composites is to enhance the mechanical properties of the composites. In theory, the incorporation of high strength and stiffness nanofiller, namely graphene nanoplatelet (GNP), could create superior composite properties. However, the main challenges of incorporating this nanofiller are its poor dispersion state and aggregation in epoxy due to its high surface area and strong Van der Waals forces in between graphene sheets. In this study, we used one of the effective methods of functionalization to improve graphene’s dispersion and also introducing nanosilica filler to enhance platelets shear mechanism. The high dispersive silica nanospheres were introduced in the tactoids morphology of stacked graphene nanosheets in order to produce high shear forces during milling and exfoliate the GNP. The hybrid nanofiller modified epoxy polymers were impregnated into BF to evaluate the mechanical properties of the basalt fibre reinforced polymeric (BFRP) system under tensile, compression, flexural, and drop-weight impact tests. In response to the synergistic effect of zero-dimensional nanosilica and two-dimensional graphene nanoplatelets enhanced the mechanical properties of BFRP, especially in Basalt fibre + 0.2 wt% GNP/15 wt% NS (BF-H0.2) with the highest increment in modulus and strength to compare with unmodified BF. These findings also revealed that the incorporation of hybrid nanofiller contributed to the improvement in the mechanical properties of the composite. BF has huge potential as an alternative to the synthetic glass fibre for the fabrication of mechanical components and structures.

A facile method to fabricate monolithic alumina–silica aerogels with high surface areas and good mechanical properties

2020 ◽  
Vol 40 (6) ◽  
pp. 2480-2488 ◽  
Author(s):  
Fei Peng ◽  
Yonggang Jiang ◽  
Junzong Feng ◽  
Liangjun Li ◽  
Huafei Cai ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Surface ◽  
Silica Aerogels ◽  
Surface Areas ◽  
Monolithic Alumina

Development and Characterization of Fly Ash Nanoparticles Reinforced Epoxy Resin Composite for Acoustic Applications

2020 ◽  
Author(s):  
Kingsley Ukoba ◽  
Samuel Popoola ◽  
Olatunde Israel ◽  
Patrick Imoisili ◽  
Tien-Chien Jen
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Epoxy Resin ◽  
Health Knowledge ◽  
Resin Composite ◽  
High Surface ◽  
Fluorescence Analysis ◽  
Noise Pollution ◽  
Sieve Analysis ◽  
Epoxy Resin Composite

Abstract Noise is an unwanted sound; requires reduction and control through the use of absorptive materials. This is imperative due to the adverse effect noise poses to human health, knowledge dissemination, and tranquility which is increasing daily due to industrialization and heightened allied activities. The use of natural and synthetic reinforced composites in noise pollution control is an emerging area of research. This study aims to develop and characterize fly ash nanoparticles reinforced epoxy resin composite for acoustic applications. Samples were prepared with fly ash nanoparticles reinforcement at 5%, 10%, 15%, 20%, and 25% and investigation of noise reduction coefficient (NRC), porosity and mechanical properties (hardness, impact, flexural strength) of samples were done. Cenospheres were obtained when fly ash particles were characterized separately with the aid of sieve analysis and x-ray fluorescence analysis. The cenospheres are hollow spherical and lightweight, inertfiller material. Correlation between porosity of the samples and their sound absorption properties was observed and showed that as porosity increased, the NRC values increased and as the porosity decreased the NRC values decreased. It was also observed that heat of polymerization, fly ash nanoparticles structure and air bubbles during sample preparation (mixing) influenced the porosity values which in turn influenced the NRC values of the composite. There was also a steady decrease in mechanical properties, as reinforcements were added (5%, 10%, 15%, 20%, and 25%), this was attributed to the high surface areas and shape of reinforcement added.

scholarly journals Modelling and Experimentation on Mechanical Properties of Graphene-Oxide Cement

2019 ◽  
Vol 274 ◽  
pp. 05004
Author(s):  
Zhiyuan Lin ◽  
Ding Fan ◽  
Shangtong Yang
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Elastic Properties ◽  
High Surface ◽  
High Surface Area ◽  
Accurate Estimation ◽  
Dispersion Property ◽  
Length Scales ◽  
Analysis And Design ◽  
Strength And Durability

Cementitious nano-composites have recently attracted considerable research interest in order to improve their properties such as strength and durability. Graphene oxide (GO) is being considered as an ideal candidate for enhancing the mechanical properties of the cement due to its good dispersion property and high surface area. Much of work has been done on experimentally investigating the mechanical properties of GO-cementitious composites; but there are currently no models for accurate estimation of their mechanical properties, making proper analysis and design of GO-cement based materials a major challenge. This paper attempts to develop a novel multi-scale analytical model for predicting the elastic modulus of GO-cement taking into account the GO/cement ratio, porosity and mechanical properties of different phases. This model employs Eshelby tensor and Mori-Tanaka solution in the process of upscaling the elastic properties of GO-cement through different length scales. In-situ micro bending tests were conducted to elucidate the behavior of the GO-cement composites and verify the proposed model. The obtained results showed that the addition of GO can change the morphology and enhance the mechanical properties of the cement. The developed model can be used as a tool to determine the elastic properties of GO-cement through different length scales.

Temperature-Dependence of Water Bridge Formation in Atomic Force Microscopy

2003 ◽  
Author(s):  
Brent A. Nelson ◽  
Mark A. Poggi ◽  
Lawrence A. Bottomley ◽  
William P. King
Keyword(s):  
Temperature Dependence ◽  
Capillary Condensation ◽  
Heated Surface ◽  
High Surface ◽  
Water Evaporation ◽  
Water Bridge ◽  
Force Microscopy ◽  
Atomic Force ◽  
Localized Heating ◽  
Low Humidity

When an Atomic Force Microscope (AFM) is operated in air, capillary condensation induces meniscus formation between the AFM tip and substrate. At present, no models account for the temperature-dependence of meniscus formation. This paper describes experiments measuring capillary forces between an AFM tip and mica at various temperatures and times. At low humidity, the capillary force decreases with increasing surface temperature in a manner unaccounted for by merely the dependence of water surface energy on temperature. We propose that this is due to water evaporation off the heated surface. The adhesion is also shown to decrease significantly with time until stabilizing after approximately an hour of experiments. Localized heating of the surface by the AFM laser is proposed as the cause of adhesion decrease. The decrease in force occurring at high surface temperatures implies a reduction in meniscus size that may potentially improve the resolution of AFM-based nanolithography techniques.

Co2.67S4-Based Photothermal Membrane with High Mechanical Properties for Efficient Solar Water Evaporation and Photothermal Antibacterial Applications

2019 ◽  
Vol 11 (23) ◽  
pp. 20820-20827 ◽  
Author(s):  
Le Zhao ◽  
Qingzhu Yang ◽  
Wei Guo ◽  
Haixia Liu ◽  
Tianyue Ma ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Evaporation ◽  
Solar Water

Tough biomimetic films for harnessing natural evaporation for various self-powered devices

2020 ◽  
Vol 8 (37) ◽  
pp. 19269-19277
Author(s):  
Tian Yang ◽  
Honglin Yuan ◽  
Sitong Wang ◽  
Xuhan Gao ◽  
Huhu Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Natural Water ◽  
Design Feature ◽  
Power Input ◽  
Water Evaporation ◽  
Soft Robots ◽  
Ionic Crosslinking ◽  
External Power ◽  
Self Powered

The biomimetic films with ionic crosslinking design feature excellent mechanical properties in both dry and wet states, which could be used as actuators, soft robots, and generators powered by natural water evaporation without external power input.

Porous Al2O3 Ceramics with High Surface Area and Superior Mechanical Properties Fabricated by the Decomposition of Al(OH)3

2001 ◽  
Vol 206-213 ◽  
pp. 1965-1968 ◽  
Author(s):  
Zhen-Yan Deng ◽  
Takayuki Fukasawa ◽  
Guo Jun Zhang ◽  
Motohide Ando ◽  
Tatsuki Ohji
Keyword(s):  
Mechanical Properties ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Superior Mechanical Properties

Triggered and self-healing systems using nanostructured materials

2013 ◽  
Vol 2 (6) ◽  
pp. 699-723 ◽  
Author(s):  
Julia Kötteritzsch ◽  
Ulrich S. Schubert ◽  
Martin D. Hager
Keyword(s):  
Mechanical Properties ◽  
Nanostructured Materials ◽  
High Surface ◽  
Volume Ratio ◽  
Self Healing ◽  
Partial Restoration

AbstractSelf-healing materials feature the outstanding ability of healing damage inflicted on them. This process leads to the (partial) restoration of the original properties of these materials, in particular of the mechanical properties. Several healing mechanisms involve processes on the nanoscopic level. These lead to the healing of the damage (e.g., crack or scratch) and, as a consequence, the macroscopic mechanical properties are reestablished. Moreover, self-healing of nanomaterials can also be achieved, which is of particular interest, because nanomaterials are particularly prone to damage due to their high surface volume ratio. This review summarizes the involvement of nanoscopic processes in the healing of macroscopic materials, and the healing of nanomaterials is discussed.

Innovative Composite HA Scaffold Rapid Prototyping for Bone Reconstruction: An In Vitro Pilot Study

2013 ◽  
Vol 583 ◽  
pp. 56-63 ◽  
Author(s):  
Isidoro Giorgio Lesci ◽  
Leonardo Ciocca ◽  
Barbara Dozza ◽  
Enrico Lucarelli ◽  
Sergio Squarzoni ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tissue Engineering ◽  
Pilot Study ◽  
Rapid Prototyping ◽  
Bone Tissue Engineering ◽  
Bone Tissue ◽  
High Surface ◽  
Surface Reactivity ◽  
Macro Scale

The ability to control the architecture and strength of a bone tissue engineering scaffold is critical to achieve a harmony between the scaffold and the host tissue. The scaffold attempts to mimic the function of the natural extracellular matrix, providing a temporary template for the growth of target tissues. The study of nanocrystalline calcium phosphate physical-chemical characteristics and, thereafter, the possibility to imitate bone mineral for the development of new advanced biomaterials is constantly growing. Scaffolds should have suitable architecture and strength to serve their intended function. Rapid prototyping (RP) technique is applied to tissue engineering to satisfy this need and to create a scaffold directly from the scanned and digitized image of the defect site. Design and construction of complex structures with different shapes and sizes, at micro and macro scale, with fully interconnected pore structure and appropriate mechanical properties are possible by using RP techniques. In this study we present a new biocompatible hybrid scaffold obtained through two different experimental methods and formed by synthetic biomimetic Hydroxyapatite (HA) nanocrystals with high surface reactivity which synergistically interacts with Poly(e-caprolactone) (PCL) and polylactic acid (PLLA). The aim of this pilot study is to test the adhesion and the proliferation of human mesenchymal stem cells (MSC) on both the scaffolds. MSC growth and distribution was evaluated 24 h and 7 days after in-vitro seeding. The results allowed the conclusion that these scaffolds are biocompatible and allow the colonization and proliferation of MSC, therefore, due to their mechanical properties, they are adequate for bone tissue engineering.

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