PMID- 15450447
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20060928
LR  - 20091111
IS  - 0021-9797 (Print)
IS  - 0021-9797 (Linking)
VI  - 278
IP  - 2
DP  - 2004 Oct 15
TI  - Study of influence on the surface energy heterogeneity of multiwalled carbon 
      nanotubes after the adsorption of poly(acrylic acid).
PG  - 299-303
AB  - The heterogeneity of the surface energy of multiwalled carbon nanotubes (MWNTs) 
      before and after the adsorption of poly(acrylic acid) (PAA) at 77 K was 
      investigated by a nitrogen probe adsorption technique in a wide range of 
      pressures. The adsorption energy distributions (AEDs) were calculated from the 
      low-pressure data of isotherms (i.e., the data of submonolayer adsorption) using 
      the regularization method. Based on the AED, two types of dominant energetic 
      surfaces are identified and assigned to the graphite-like carbon and disordered 
      carbon or defects in the pure MWNTs, respectively. While the adsorption amount of 
      PAA is raised, a significant decrease in the contribution of higher-energy 
      surface in AEDs is observed for those PAA-adsorbed MWNTs. It is thus demonstrated 
      that PAA prefers interacting with higher-energy surfaces to lower-energy surfaces 
      in MWNTs. Nitrogen probe adsorption measurements including low-pressure data are 
      shown to be a feasible and effective tool to characterize the heterogeneity of 
      structure and surface properties of porous materials.
FAU - Hou, Qingfeng
AU  - Hou Q
AD  - Research Center of Surface and Interface Chemical Engineering Technology, Nanjing 
      University, Nanjing 210093, People's Republic of China.
FAU - Lu, Xiancai
AU  - Lu X
FAU - Liu, Xiandong
AU  - Liu X
FAU - Hu, Baixing
AU  - Hu B
FAU - Shen, Jian
AU  - Shen J
LA  - eng
PT  - Journal Article
PL  - United States
TA  - J Colloid Interface Sci
JT  - Journal of colloid and interface science
JID - 0043125
EDAT- 2004/09/29 05:00
MHDA- 2004/09/29 05:01
CRDT- 2004/09/29 05:00
PHST- 2004/03/15 00:00 [received]
PHST- 2004/05/20 00:00 [accepted]
PHST- 2004/09/29 05:00 [pubmed]
PHST- 2004/09/29 05:01 [medline]
PHST- 2004/09/29 05:00 [entrez]
AID - S0021-9797(04)00534-X [pii]
AID - 10.1016/j.jcis.2004.05.047 [doi]
PST - ppublish
SO  - J Colloid Interface Sci. 2004 Oct 15;278(2):299-303. doi: 
      10.1016/j.jcis.2004.05.047.