A dense graphene monolith with poloxamer prefunctionalization enabling aqueous redispersion to obtain solubilized graphene sheets  

作　　者：Chen Ye Fan Zhang Xue Tan Huifang Sun Wen Dai Ke Yang Minghui Yang Shiyu Du Dan Dai Jinhong Yu Nan Jiang Weitao Su Li Fu He Li Jing Kong Cheng-Te Lin 

机构地区：[1]Key Laboratory of Marine Materials and Related Technologies,Zhejiang Key Laboratory of Marine Materials and Protective Technologies,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [3]Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China [4]Ningbo Institute of Materials Technology and Engineering(NIMTE),Chinese Academy of Sciences,Ningbo 315201,China [5]Division of Functional Materials and Nanodevices,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China [6]College of Materials and Environmental Engineering,Hangzhou Dianzi University,Hangzhou 310018,China [7]Department of Electrical Engineering and Computer Science,Massachusetts Institute of Technology,Cambridge,Massachusetts 02139,United States

出　　处：《Chinese Chemical Letters》2020年第9期2507-2511,共5页中国化学快报（英文版）

基　　金：financial support by the National Natural Science Foundation of China(Nos.51573201,51501209 and 201675165);NSFC-Zhejiang Joint Fund for the Integration of Industrialization and Informatization(No.U1709205);the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA22000000);Scientific Instrument Developing Project of the Chinese Academy of Sciences(No.YZ201640);Science and Technology Major Project of Ningbo(Nos.2016S1002 and 2016B10038);International S&T Cooperation Program of Ningbo(No.2017D10016)for financial support;the Chinese Academy of Sciences for Hundred Talents Program;Chinese Central Government for Thousand Young Talents Program;3315 Program of Ningbo。

摘　　要：The realization of good aqueous dispersibility of commercial graphene products composed of exfoliated graphene sheets is of significance for downstream applications.However,the tap density of commercial graphene powder is quite low(0.03-0.1 kg/m3),meaning that 1 kg graphene powder occupies about 10-30 m3 in volume during transportation.And,the available content of commercial graphene dispersion/slurry in aqueous medium cannot exceed 5 wt%,although the density is high(≈1050 kg/m3).In this work,a graphene monolith was prepared by oven-drying of graphene sheets prefunctionalized with poloxamer surfactants.Our graphene monoliths not only have a high density(1500 kg/m^3) and high graphene content(≈10 wt%),but also a full capability to be completely redispersed(≈100%) in water by bath sonication to obtain solubilized graphene sheets,whose lateral size and thickness are unchanged compared to as-exfoliated ones.Moreover,a simple empirical method was proposed to predict the redispersion capability of graphene monoliths using different poloxamers by contact angle measurements.Our results provide a universal approach to make exfoliated graphene-based products with better downstream availability and lower transportation cost.

关 键 词：Dense monolith Graphene sheets POLOXAMER Aqueous redispersion Surface functionalization 

分 类 号：TQ127.11[化学工程—无机化工]