PMID- 31507173
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20191003
LR  - 20191007
IS  - 1944-8252 (Electronic)
IS  - 1944-8244 (Linking)
VI  - 11
IP  - 39
DP  - 2019 Oct 2
TI  - Virtual Loudspeaker Effect of Graphene-Based Hybrid Material To Improve 
      Low-Frequency Acoustic Performance.
PG  - 35941-35948
LID - 10.1021/acsami.9b07965 [doi]
AB  - Closed-box loudspeaker systems (CBLSSs) are compact and simple air-suspension 
      loudspeaker systems, and their low-frequency responses are determined by two 
      fundamental parameters: resonance frequency and total damping. Recently, 
      electronic devices have come to require more compact designs, so the volumes of 
      loudspeaker should be reduced. However, a small loudspeaker cannot retain 
      sufficient acoustic space, resulting in poor low-frequency acoustic performance. 
      Herein, we investigated acoustic characterization of the CBLSS with different 
      filling materials such as thermally expanded graphene oxide (TEGO), activated 
      carbon, graphene platelets, and melamine foam (MF). Upon the powder-based test, 
      the resonance frequency of the loudspeaker decreased and resulted in a volume 
      increasing effect inside of the loudspeaker. The TEGO shows almost double volume 
      increase rate, compared to other particle-based filling materials. Employing 
      hybrid filling material that consists of TEGO in an MF cage (TEGO@MF), the volume 
      increase rate of the novel loudspeaker was over 24% at 300 cc. Because of the 
      high adsorptive characteristics and thermal properties of TEGO, the acoustic 
      performance in the low-frequency domain was clearly enhanced, despite the reduced 
      mass loading. Furthermore, these properties were observed to be highly effective 
      for enhancing the low-frequency acoustic performance of the larger loudspeaker, 
      achieving a volume increase rate of 49.5% in a 700 cc enclosure.
FAU - Kim, Ji Hoon
AU  - Kim JH
AD  - Department of Mechanical Engineering , Incheon National University , Academy-ro, 
      Yeonsu-gu, Incheon 22012 , Republic of Korea.
FAU - Lim, Sun Taek
AU  - Lim ST
AD  - Department of Mechanical Engineering , Incheon National University , Academy-ro, 
      Yeonsu-gu, Incheon 22012 , Republic of Korea.
FAU - Shim, Gyu Hyeon
AU  - Shim GH
AD  - Department of Mechanical Engineering , Incheon National University , Academy-ro, 
      Yeonsu-gu, Incheon 22012 , Republic of Korea.
FAU - Lee, Gil Won
AU  - Lee GW
AD  - Department of Mechanical Engineering , Incheon National University , Academy-ro, 
      Yeonsu-gu, Incheon 22012 , Republic of Korea.
FAU - Kim, Sungjoo
AU  - Kim S
AD  - SAMSUNG Electronics Company Limited , Samsung-ro, Yeongtong-gu, Suwon-si 16677 , 
      Gyenggi-do , Republic of Korea.
FAU - Kim, Namkeun
AU  - Kim N
AD  - Department of Mechanical Engineering , Incheon National University , Academy-ro, 
      Yeonsu-gu, Incheon 22012 , Republic of Korea.
FAU - Wongwises, Somchai
AU  - Wongwises S
AD  - Department of Mechanical Engineering , King Mongkut's University of Technology 
      Thonburi , Bangkok 10140 , Thailand.
FAU - Ahn, Ho Seon
AU  - Ahn HS
AUID- ORCID: 0000-0002-1036-3038
AD  - Division of Thermal and Fluids Science, Institute for Computational Science; 
      Faculty of Electrical and Electronics Engineering , Ton Duc Thang University , Ho 
      Chi Minh City 700000 , Vietnam.
AD  - Department of Mechanical Engineering , Incheon National University , Academy-ro, 
      Yeonsu-gu, Incheon 22012 , Republic of Korea.
LA  - eng
PT  - Journal Article
DEP - 20190923
PL  - United States
TA  - ACS Appl Mater Interfaces
JT  - ACS applied materials & interfaces
JID - 101504991
SB  - IM
OTO - NOTNLM
OT  - acoustic absorber
OT  - adsorptive material
OT  - graphene
OT  - loudspeaker
OT  - low frequency
EDAT- 2019/09/12 06:00
MHDA- 2019/09/12 06:01
CRDT- 2019/09/12 06:00
PHST- 2019/09/12 06:00 [pubmed]
PHST- 2019/09/12 06:01 [medline]
PHST- 2019/09/12 06:00 [entrez]
AID - 10.1021/acsami.9b07965 [doi]
PST - ppublish
SO  - ACS Appl Mater Interfaces. 2019 Oct 2;11(39):35941-35948. doi: 
      10.1021/acsami.9b07965. Epub 2019 Sep 23.