PMID- 21751779
OWN - NLM
STAT- MEDLINE
DCOM- 20120109
LR  - 20131121
IS  - 1520-5827 (Electronic)
IS  - 0743-7463 (Linking)
VI  - 27
IP  - 16
DP  - 2011 Aug 16
TI  - Preparation of airborne Ag/CNT hybrid nanoparticles using an aerosol process and 
      their application to antimicrobial air filtration.
PG  - 10256-64
LID - 10.1021/la201851r [doi]
AB  - Carbon nanotubes (CNTs) have been widely used in a variety of applications 
      because of their unique structure and excellent mechanical and electrical 
      properties. Additionally, silver (Ag) nanoparticles exhibit broad-spectrum 
      biocidal activity toward many different bacteria, fungi, and viruses. In this 
      study, we prepared Ag-coated CNT hybrid nanoparticles (Ag/CNTs) using aerosol 
      nebulization and thermal evaporation/condensation processes and tested their 
      usefulness for antimicrobial air filtration. Droplets were generated from a CNT 
      suspension using a six-jet collison nebulizer, passed through a diffusion dryer 
      to remove moisture, and entered a thermal tube furnace where silver nanoparticles 
      were generated by thermal evaporation/condensation at  approximately 980  degrees C in a nitrogen 
      atmosphere. The CNT and Ag nanoparticle aerosols mixed together and attached to 
      each other, forming Ag/CNTs. For physicochemical characterization, the Ag/CNTs 
      were introduced into a scanning mobility particle sizer (SMPS) for size 
      distribution measurements and were sampled by the nanoparticle sampler for 
      morphological and elemental analyses. For antimicrobial air filtration 
      applications, the airborne Ag/CNT particles generated were deposited continuously 
      onto an air filter medium. Physical characteristics (fiber morphology, pressure 
      drop, and filtration efficiency) and biological characteristics (antimicrobial 
      tests against Staphylococcus epidermidis and Escherichia coli bioaerosols) were 
      evaluated. Real-time SMPS and transmission electron microscopy (TEM) data showed 
      that Ag nanoparticles that were <20 nm in diameter were homogeneously dispersed 
      and adhered strongly to the CNT surfaces. Because of the attachment of Ag 
      nanoparticles onto the CNT surfaces, the total particle surface area 
      concentration measured by a nanoparticle surface area monitor (NSAM) was lower 
      than the summation of each Ag nanoparticle and CNT generated. When Ag/CNTs were 
      deposited on the surface of an air filter medium, the antimicrobial activity 
      against test bacterial bioaerosols was enhanced, compared with the deposition of 
      CNTs or Ag nanoparticles alone, whereas the filter pressure drop and bioaerosol 
      filtration efficiency were similar to those of CNT deposition only. At a 
      residence time of 2 h, the relative microbial viabilities of gram-positive S. 
      epidermidis were  approximately 32, 13, 5, and 0.9% on the control, CNT-, Ag nanoparticle-, and 
      Ag/CNT-deposited filters, respectively, and those of gram-negative E. coli were 
      13, 2.1, 0.4, and 0.1% on the control, CNTs, Ag nanoparticles, and Ag/CNTs, 
      respectively. These Ag/CNT hybrid nanoparticles may be useful for applications in 
      biomedical devices and antibacterial control systems.
FAU - Jung, Jae Hee
AU  - Jung JH
AD  - Global Environment Center, Korea Institute of Science and Technology, 
      Hawolgok-dong, Seongbuk-gu, Seoul 136-791, Republic of Korea.
FAU - Hwang, Gi Byoung
AU  - Hwang GB
FAU - Lee, Jung Eun
AU  - Lee JE
FAU - Bae, Gwi Nam
AU  - Bae GN
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20110721
PL  - United States
TA  - Langmuir
JT  - Langmuir : the ACS journal of surfaces and colloids
JID - 9882736
RN  - 0 (Aerosols)
RN  - 0 (Anti-Infective Agents)
RN  - 0 (Nanotubes, Carbon)
RN  - 3M4G523W1G (Silver)
SB  - IM
MH  - Aerosols/*chemistry
MH  - Anti-Infective Agents/*chemistry/pharmacology
MH  - Escherichia coli/drug effects
MH  - Filtration/*methods
MH  - Metal Nanoparticles/*chemistry/ultrastructure
MH  - Microscopy, Electron, Transmission
MH  - Nanotubes, Carbon/*chemistry/ultrastructure
MH  - Silver/*chemistry
MH  - Staphylococcus epidermidis/drug effects
EDAT- 2011/07/15 06:00
MHDA- 2012/01/10 06:00
CRDT- 2011/07/15 06:00
PHST- 2011/07/15 06:00 [entrez]
PHST- 2011/07/15 06:00 [pubmed]
PHST- 2012/01/10 06:00 [medline]
AID - 10.1021/la201851r [doi]
PST - ppublish
SO  - Langmuir. 2011 Aug 16;27(16):10256-64. doi: 10.1021/la201851r. Epub 2011 Jul 21.