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Your search keyword '"Li, Tiehu"' showing total 107 results
Start Over Author "Li, Tiehu" Publisher elsevier bv
107 results on '"Li, Tiehu"'

31. Physiochemical evaluations, mechanical attenuations and thermal stability of graphene nanosheets and functionalized nanodiamonds loaded pitch derived carbon foam composites

Author

Muhammad Khan, Li Tiehu, Amjad Hussain, Ali Raza, Amir Zada, Dang Alei, Ahsan Riaz Khan, Rawaid Ali, Hidayat Hussain, Javid Hussain, Zainul Wahab, and Muhammad Imran

Subjects
Mechanical Engineering, Materials Chemistry, General Chemistry, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials
Published
2022

39. Comparative study of the ball milling and acid treatment of functionalized nanodiamond composites

Author

Imran Khan, Li Tiehu, Muhammad Khan, Amjad L. Lone, Asif Hayat, Tingkai Zhao, Farman Ali, Aqeel A. Khurram, Azeem Ullah, and Sundas Iqbal

Subjects
Nanocomposite, Materials science, Biocompatibility, technology, industry, and agriculture, 02 engineering and technology, Epoxy, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Flexural strength, visual_art, Ultimate tensile strength, visual_art.visual_art_medium, Surface modification, Composite material, 0210 nano-technology, Nanodiamond, Ball mill
Abstract

Diamond nanoparticles (DNPs) have been strongly integrated into diverse technological applications due to its nano-size, good chemical stability, super hardness, thermal conductivity and biocompatibility. Agglomeration and non-uniform distribution of DNPs in different matrices are the two main concern problems which limits its wide spread applications. Herein, our present research work demonstrated a comparative study of ball milling and acid treatments of functionalization DNPs through surface modification with carboxylic acid and amid functional groups. The dispersion measurement showed that ball mill treated DNPs is uniform and homogeneously dispersed in dimethyl-sulfoxide (DMSO) rather than as-received and acid treated DNPs. Furthermore, the use of various weight percentages of acid and ball mill functionalized DNPs in epoxy resin showed that 0.2 wt% is the optimum amount which revealed the highest ultimate tensile strength, flexural strength, Young's modulus and energy to break values of the nanocomposites. The comparative analysis showed that ball mill treatment of functionalization significantly enhanced the mechanical performances of epoxy resin more effectively than acid treatment thus demonstrated the importance of ball milling technique.

Published
2018

40. Effect of multi walled carbon nanotubes and diamond nanoparticles on the structure and properties of carbon foams

Author

Zafar Ali, Abbas Khan, Chuanyin Xiong, Li Tiehu, Azeem Ullah, Muhammad Idrees, Abdul Malik, Muhammad Khan, Shasha Jiao, Tingkai Zhao, and Imran Khan

Subjects
Materials science, Mechanical Engineering, Carbon nanofoam, chemistry.chemical_element, 02 engineering and technology, General Chemistry, Carbon nanotube, 010402 general chemistry, 021001 nanoscience & nanotechnology, Microstructure, 01 natural sciences, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, law.invention, Nickel, Adsorption, Compressive strength, chemistry, law, Materials Chemistry, Electrical and Electronic Engineering, Composite material, 0210 nano-technology, Carbon, Pyrolysis
Abstract

Multi wall carbon nanotubes (MWCNTs) and diamond nanoparticles (DNPs) reinforced carbon foam composites were prepared by the direct pyrolysis of MWCNTs, DNPs and mesophase coal tar pitch mixture. The effect of additive amounts on the microstructure and properties of carbon foams were studied. Significant impacts on the microstructure of carbon foams were observed after the incorporation of additive amounts. Whereas, the additive behavior of MWCNTs and DNPs were further investigated in terms of adsorption, mechanical and thermal properties. The results shows that the nickel (Ni) and cadmium (Cd) metal ions adsorption tendency increases with the increase of MWCNTs and DNPs contents. The maximum adsorption percentage of 84.6 and 86.9% was observed for carbon foam containing 2 wt% MWCNT-DNPs loading for Ni and Cd ions respectively. Furthermore, the compressive strength and thermal conductivity of the carbon foams were enhanced with the increase of additives amounts. Maximum improvement of 19.22 MPa in the compressive strength and 37.46 W/m K at 800 °C of thermal conductivity was revealed by carbon foam composite containing 4 wt% MWCNT-DNPs additive amounts.

Published
2017

49. Reinforcement effect of acid modified nanodiamond in epoxy matrix for enhanced mechanical and electromagnetic properties

Author

Azeem Ullah, Muhammad Khan, Aqeel A. Khurram, Zafar Ali, Naveed Zafar Ali, Tingkai Zhao, Li Tiehu, and Chuanyin Xiong

Subjects
Toughness, Nanocomposite, Materials science, Mechanical Engineering, Relative permittivity, 02 engineering and technology, General Chemistry, Epoxy, 010402 general chemistry, 021001 nanoscience & nanotechnology, Detonation nanodiamond, 01 natural sciences, Surface energy, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, visual_art, Ultimate tensile strength, Materials Chemistry, visual_art.visual_art_medium, Surface modification, Electrical and Electronic Engineering, Composite material, 0210 nano-technology
Abstract

We applied acid treatment for the surface modification of detonation nanodiamond (DND) powder by minimizing their surface energy to overcome agglomeration and improve dispersion of DNDs. Different concentrations of acid modified DND in 828 epoxy matrix were fabricated to check their mechanical and electromagnetic properties. Mechanical properties were checked in terms of ultimate tensile strength (UTS), toughness, energy to break, percent strain break and Young's modulus while electromagnetic shielding properties were studied in frequency range of 11–17 GHz. To analyze electrical and magnetic properties of the nanocomposites, relative permittivity and permeability tests were performed. Excellent interactions among acid modified DND and epoxy resin was observed due to carboxyl and hydroxyl functional groups that results in the formation of efficient load transfer interface, which in turn enhance the mechanical and electromagnetic properties of epoxy nanocomposites. During investigation it was observed that mechanical properties and relative permittivity showed enhancements when, 0.2 wt% acid modified DND were used as a nano-filler, while on further increment of modified DND these properties start decreasing. Unlike this, the relative permeability, reflection and transmission loss values were increased with the increase of acid modified DND content.

Published
2017

50. Surface optimization of detonation nanodiamonds for the enhanced mechanical properties of polymer/nanodiamond composites

Author

Azeem Ullah, Faisal Attique, Muhammad Khan, Abdul Hamid, Ishaq Ahmad, Yaqoob Khan, Amjad Hussain, Li Tiehu, Naveed Ahmad, Amjad Ali, Amir Zada, Asif Hayat, Iram Mahmood, and Tingkai Zhao

Subjects
chemistry.chemical_classification, Materials science, Ozone, Mechanical Engineering, Oxide, 02 engineering and technology, General Chemistry, Polymer, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, chemistry.chemical_compound, chemistry, Flexural strength, Ultimate tensile strength, Materials Chemistry, Electrical and Electronic Engineering, Composite material, 0210 nano-technology, Nanodiamond, Dispersion (chemistry), Ball mill
Abstract

The surface of agglomerated nanodiamond (ND) particles was modified with carboxylic acid and ammine moieties using UV/ozone and ball milling methods respectively. The microstructural analysis revealed that the initial agglomerated NDs clusters were predominantly reduced in size with the UV/ozone and ball milling treatments. The UV/ozone and ball mill functionalized NDs were kept for dispersion under observations into ethanol, water and dimethyl sulfonic oxide (DMSO) solvents. The dispersion images satisfactorily showed that all the surface modified NDs samples reveals good dispersion tendency comparatively to pristine NDs whereas, the ball mill treated NDs showed outstanding dispersion behavior rather than all samples. Furthermore, the mechanical properties were investigated using various amounts of surface modified NDs in epoxy matrix. The mechanical properties were checked in terms of ultimate tensile strength (UTS), Percent break strain and Flexural strength. The results of all the mentioned mechanical properties revealed that 0.3 wt% was the optimum amount for getting highest properties. Similarly ball mill treated NDs represented the remarkable enhancements in all mechanical performances comparatively to pristine and UV/ozone treated ND samples.

Published
2020

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