Tuning the aggregation of graphene oxide dispersions to synthesize elastic, low density graphene aerogels

2017 ◽  
Vol 5 (44) ◽  
pp. 23123-23130 ◽  
Author(s):  
Kaiwen Hu ◽  
Thomas Szkopek ◽  
Marta Cerruti
Keyword(s):  
Graphene Oxide ◽  
Low Density ◽  
Graphene Aerogel ◽  
Graphene Aerogels

Controlled aggregation of graphene oxide leads to the formation of ultralight elastic graphene aerogel.

scholarly journals Hydroplastic foaming of graphene aerogels and artificially intelligent tactile sensors

2020 ◽  
Vol 6 (46) ◽  
pp. eabd4045
Author(s):  
Kai Pang ◽  
Xian Song ◽  
Zhen Xu ◽  
Xiaoting Liu ◽  
Yingjun Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Mechanical Stability ◽  
Bubble Formation ◽  
Tactile Sensors ◽  
Graphene Aerogel ◽  
Precision Control ◽  
Direct Foaming ◽  
Graphene Aerogels ◽  
Cellular Wall ◽  
The Ideal

Direct foaming from solids is the most efficient method to fabricate porous materials. However, the ideal foaming fails to prepare aerogel of nanoparticles because the plasticity of their solids is denied by the overwhelming interface interactions. Here, we invent a hydroplastic foaming method to directly convert graphene oxide solids into aerogel bulks and microarrays, replacing the prevalent freezing method. The water intercalation plasticizes graphene oxide solids and enables direct foaming instead of catastrophic fragmentation. The bubble formation follows a general crystallization rule and allows nanometer-precision control of cellular wall thickness down to 8 nm. Bubble clustering generates hyperboloid structures with seamless basal connection and renders graphene aerogels with ultrarobust mechanical stability against extreme deformations. We exploit graphene aerogel to fabricate tactile microarray sensors with ultrasensitivity and ultrastability, achieving a high accuracy (80%) in artificially intelligent touch identification that outperforms human fingers (30%).

Improved mechanical and barrier properties of low-density polyethylene nanocomposite films by incorporating hydrophobic graphene oxide nanosheets

RSC Advances ◽  
2015 ◽  
Vol 5 (98) ◽  
pp. 80739-80748 ◽  
Author(s):  
Hua-Dong Huang ◽  
Sheng-Yang Zhou ◽  
Peng-Gang Ren ◽  
Xu Ji ◽  
Zhong-Ming Li
Keyword(s):  
Graphene Oxide ◽  
Barrier Properties ◽  
Nanocomposite Films ◽  
Low Density Polyethylene ◽  
Packaging Materials ◽  
Low Density ◽  
Graphene Oxide Nanosheets

The successful conversion from hydrophilic GONSs to hydrophobic ODA–GONSs imparts LDPE nanocomposite films with enhanced mechanical and barrier performances for potential packaging materials.

Three-dimensional MoSx(1 < x < 2) nanosheets decorated graphene aerogel for lithium–oxygen batteries

2016 ◽  
Vol 4 (28) ◽  
pp. 10986-10991 ◽  
Author(s):  
Liangyu Li ◽  
Chunguang Chen ◽  
Junming Su ◽  
Peng Kuang ◽  
Congcong Zhang ◽  
...  
Keyword(s):  
Freeze Drying ◽  
Three Dimensional ◽  
Drying Method ◽  
Graphene Aerogel ◽  
Graphene Aerogels ◽  
3D Architecture ◽  
Lithium Oxygen Batteries ◽  
Potential Oxygen ◽  
Oxygen Cathode

MoSx/graphene aerogels with a 3D architecture were synthesized using a hydrothermal and freeze-drying method and were further applied in Li–O2batteries as a potential oxygen cathode.

CNT-enhanced amino-functionalized graphene aerogel adsorbent for highly efficient removal of formaldehyde

2017 ◽  
Vol 41 (7) ◽  
pp. 2527-2533 ◽  
Author(s):  
Lirui Wu ◽  
Ziyi Qin ◽  
Lanxin Zhang ◽  
Tao Meng ◽  
Fei Yu ◽  
...  
Keyword(s):  
Functionalized Graphene ◽  
Efficient Removal ◽  
Graphene Aerogel ◽  
Graphene Aerogels ◽  
Highly Efficient ◽  
Gaseous Formaldehyde

Graphene aerogels modified using two different methods were investigated for their capacities to adsorb gaseous formaldehyde.

Direct Conversion of Graphene Aerogel into Low-Density Diamond Aerogel Composed of Ultrasmall Nanocrystals

2018 ◽  
Vol 122 (24) ◽  
pp. 13193-13198 ◽  
Author(s):  
Luyao Zhu ◽  
Mingguang Yao ◽  
Jiajun Dong ◽  
Kuo Hu ◽  
Ran Liu ◽  
...  
Keyword(s):  
Direct Conversion ◽  
Low Density ◽  
Graphene Aerogel

Recyclable catalyst for catalytic hydrogenation of phenylacetylene by coupling Pd nanoparticles with highly compressible graphene aerogels

RSC Advances ◽  
2014 ◽  
Vol 4 (104) ◽  
pp. 59977-59980 ◽  
Author(s):  
Xu Zhang ◽  
Zhiyu Wang ◽  
Shuang Li ◽  
Chunlei Wang ◽  
Jieshan Qiu
Keyword(s):  
Graphene Oxide ◽  
Catalytic Hydrogenation ◽  
Chemical Reduction ◽  
Pd Nanoparticles ◽  
Catalytic Performance ◽  
Hydrogenation Reaction ◽  
Recyclable Catalyst ◽  
Graphene Aerogels ◽  
Excellent Catalytic Performance

Highly compressible graphene aerogels were made by chemical reduction of graphene oxide with HI, which act as recyclable catalyst to exhibit excellent catalytic performance towards selective semi-hydrogenation reaction after loading Pd nanoparticles.

Compressible graphene aerogel supported CoO nanostructures as a binder-free electrode for high-performance lithium-ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (12) ◽  
pp. 8929-8932 ◽  
Author(s):  
Yanfeng Dong ◽  
Shaohong Liu ◽  
Zhiyu Wang ◽  
Yang Liu ◽  
Zongbin Zhao ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
High Performance ◽  
Lithium Ion ◽  
Graphene Aerogel ◽  
Graphene Aerogels ◽  
Binder Free

Binder-free electrodes have been synthesized by coupling compressible graphene aerogels with CoO nanostructures, which exhibit superior electrochemical performance to conventional electrodes made of powders and binders in lithium-ion batteries.

Comparative study of graphene aerogels synthesized using sol−gel method by reducing graphene oxide suspension

2017 ◽  
Vol 51 (4) ◽  
pp. 269-276 ◽  
Author(s):  
A. S. Lobach ◽  
V. A. Kazakov ◽  
N. G. Spitsyna ◽  
S. A. Baskakov ◽  
N. N. Dremova ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Comparative Study ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Graphene Aerogels

scholarly journals The Effect of Solvothermal Conditions on the Properties of Three-Dimensional N-Doped Graphene Aerogels

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 350 ◽  
Author(s):  
Alina Pruna ◽  
Alfonso Cárcel ◽  
Adolfo Benedito ◽  
Enrique Giménez
Keyword(s):  
Ring Opening ◽  
Operating Temperature ◽  
Three Dimensional ◽  
Low Density ◽  
Epoxy Ring ◽  
Graphene Aerogels ◽  
N Doping ◽  
Epoxy Ring Opening ◽  
Doped Graphene ◽  
Solvothermal Conditions

Low-density three-dimensional (3D) N-doped graphene aerogels by a one-step solvothermal method in the presence of ethylenediamine (EDA) are reported. The gelation, formation, and properties of the aerogels were studied with solvothermal conditions, namely, operating temperature, time, graphene oxide (GO) concentration, and the GO/EDA w/w ratio. Two ranges of solvothermal conditions are employed: one involving an operating temperature below 100 °C and a conventional chemical reduction of GO with EDA at atmospheric pressure and a second one employing a higher temperature range up to 165 and a high pressure reduction with EDA. The results show that both solvothermal approaches allow for the fabrication of homogeneous N-doped 3D graphene aerogels with density values close to 10 mg cm−3. The measurements indicated that low values of GO concentration, temperature, and EDA are optimum for obtaining low-density 3D aerogels. N doping is improved with an EDA amount in lower temperature conditions. The N doping mechanism below 100 °C is dominated by the epoxy ring opening while at temperatures up to 165 °C both epoxy ring opening and amidation take place. The CO2 adsorption properties are strongly controlled by the nitrogen configuration, namely, pyridinic nitrogen in terms of its density.

Sign in / Sign up

Export Citation Format

Share Document