Robust aerogels based on conjugated microporous polymer nanotubes with exceptional mechanical strength for efficient solar steam generation

2018 ◽  
Vol 6 (37) ◽  
pp. 18183-18190 ◽  
Author(s):  
Peng Mu ◽  
Wei Bai ◽  
Zheng Zhang ◽  
Jingxian He ◽  
Hanxue Sun ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Mechanical Strength ◽  
Steam Generation ◽  
Low Thermal Conductivity ◽  
Conjugated Microporous Polymer ◽  
Microporous Polymer ◽  
Solar Steam Generation ◽  
Polymer Nanotubes

We report the synthesis of elastomeric conjugated microporous polymer nanotube aerogels with exceptional mechanical strength, excellent porous features and low thermal conductivity, which show great potential for solar steam generation.

Monolithic nanofoam based on conjugated microporous polymer nanotubes with ultrahigh mechanical strength and flexibility for energy storage

2018 ◽  
Vol 6 (25) ◽  
pp. 11676-11681 ◽  
Author(s):  
Peng Mu ◽  
Hanxue Sun ◽  
Zhaoqi Zhu ◽  
Jingxian He ◽  
Weidong Liang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Mechanical Strength ◽  
Conjugated Microporous Polymer ◽  
Microporous Polymer ◽  
Polymer Nanotubes

A new elastomeric CMP monolithic nanofoam with excellent processability, exceptional mechanical strength and flexibility was synthesized for energy storage.

scholarly journals Study of the Turning Nickel Base Alloy Pyromet® 31V (SAE HEV8)

2011 ◽  
Vol 278 ◽  
pp. 312-320 ◽  
Author(s):  
Marcos Valério Ribeiro ◽  
André Luís Habib Bahia
Keyword(s):  
Thermal Conductivity ◽  
Mechanical Strength ◽  
High Temperatures ◽  
Base Alloy ◽  
Production Costs ◽  
Machining Parameters ◽  
Nickel Base Alloy ◽  
Low Thermal Conductivity ◽  
Nickel Base ◽  
Coated Carbide

Considering the constant technological developments in the aeronautical, space, automotive, shipbuilding, nuclear and petrochemical fields, among others, the use of materials with high strength mechanical capabilities at high temperatures has been increasingly used. Among the materials that meet the mechanical strength and corrosion properties at temperatures around 815 °C one can find the nickel base alloy Pyromet® 31V (SAE HEV8). This alloy is commonly applied in the manufacturing of high power diesel engines exhaust valves where it is required high resistance to sulphide, corrosion and good resistance to creep. However, due to its high mechanical strength and low thermal conductivity its machinability is made difficult, creating major challenges in the analysis of the best combinations among machining parameters and cutting tools to be used. Its low thermal conductivity results in a concentration of heat at high temperatures in the interfaces of workpiece-tool and tool-chip, consequently accelerating the tools wearing and increasing production costs. This work aimed to study the machinability, using the carbide coated and uncoated tools, of the hot-rolled Pyromet® 31V alloy with hardness between 41.5 and 42.5 HRC. The nickel base alloy used consists essentially of the following components: 56.5% Ni, 22.5% Cr, 2,2% Ti, 0,04% C, 1,2% Al, 0.85% Nb and the rest of iron. Through the turning of this alloy we able to analyze the working mechanisms of wear on tools and evaluate the roughness provided on the cutting parameters used. The tests were performed on a CNC lathe machine using the coated carbide tool TNMG 160408-23 Class 1005 (ISO S15) and uncoated tools TNMG 160408-23 Class H13A (ISO S15). Cutting fluid was used so abundantly and cutting speeds were fixed in 75 and 90 m/min. to feed rates that ranged from 0.12, 0.15, 0.18 and 0.21 mm/rev. and cutting depth of 0.8mm. The results of the comparison between uncoated tools and coated ones presented a machined length of just 30% to the first in relation to the performance of the second. The coated tools has obtained its best result for both 75 and 90 m/min. with feed rate of 0.15 mm/rev. unlike the uncoated tool which obtained its better results to 0.12 mm/rev.

Incorporation of MnO nanoparticles inside porous carbon nanotubes originated from conjugated microporous polymers for lithium storage

2016 ◽  
Vol 4 (48) ◽  
pp. 19132-19139 ◽  
Author(s):  
Qingtang Zhang ◽  
Qinqin Dai ◽  
Meng Li ◽  
Xiaomei Wang ◽  
An Li
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Performance ◽  
Porous Carbon ◽  
Lithium Storage ◽  
Microporous Polymers ◽  
Conjugated Microporous Polymer ◽  
Microporous Polymer ◽  
Conjugated Microporous Polymers ◽  
Polymer Nanotubes

Porous carbon nanotubes were simply fabricated by the pyrolysis of conjugated microporous polymer nanotubes, followed by doping MnO nanoparticles inside of the nanotubes (MnO–PCNTs). MnO–PCNTs deliver superior electrochemical performance to PCNTs.

Synthesis of conjugated microporous polymer nanotubes with large surface areas as absorbents for iodine and CO2 uptake

2015 ◽  
Vol 3 (1) ◽  
pp. 87-91 ◽  
Author(s):  
Yingfan Chen ◽  
Hanxue Sun ◽  
Ruixia Yang ◽  
Tingting Wang ◽  
Chunjuan Pei ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Co2 Uptake ◽  
High Adsorption ◽  
Surface Areas ◽  
Conjugated Microporous Polymer ◽  
Microporous Polymer ◽  
High Adsorption Capacity ◽  
Polymer Nanotubes

Conjugated microporous polymer nanotubes (CMPNs) were synthesized and employed as a platform for investigation of CO2 and I2 adsorption. A high adsorption capacity of up to 208 wt% for reversible I2 capture was achieved.

Synthesis of conjugated microporous polymer nanotubes for polymer composites

RSC Advances ◽  
2015 ◽  
Vol 5 (32) ◽  
pp. 24893-24898 ◽  
Author(s):  
Zhentao Xiang ◽  
Hanxue Sun ◽  
Zhaoqi Zhu ◽  
Weidong Liang ◽  
Baoping Yang ◽  
...  
Keyword(s):  
Polymer Composites ◽  
Microporous Polymers ◽  
Conjugated Microporous Polymer ◽  
Microporous Polymer ◽  
Enhanced Properties ◽  
Conjugated Microporous Polymers ◽  
Polymer Nanotubes

Tubular conjugated microporous polymers were synthesized and used as fillers for preparation of polymer composites with enhanced properties.

Low-density graphene/carbon composite aerogels prepared at ambient pressure with high mechanical strength and low thermal conductivity

RSC Advances ◽  
2015 ◽  
Vol 5 (7) ◽  
pp. 5197-5204 ◽  
Author(s):  
Kang Guo ◽  
Zijun Hu ◽  
Huaihe Song ◽  
Xian Du ◽  
Liang Zhong ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Mechanical Strength ◽  
Compression Strength ◽  
Ambient Pressure ◽  
Carbon Matrix ◽  
Carbon Composite ◽  
Low Density ◽  
High Mechanical Strength ◽  
Low Thermal Conductivity ◽  
Composite Aerogels

SEM and TEM pictures show that GNSs can be well-dispersed in a carbon matrix. The resultant composite CAs exhibited high compression strength and extremely low thermal conductivity of 0.028 W m−1 K−1.

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