PMID- 33291627
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20201226
IS  - 2079-4991 (Print)
IS  - 2079-4991 (Electronic)
IS  - 2079-4991 (Linking)
VI  - 10
IP  - 12
DP  - 2020 Dec 4
TI  - Tunable Magnetic Hyperthermia Properties of Pristine and Mildly Reduced Graphene 
      Oxide/Magnetite Nanocomposite Dispersions.
LID - 10.3390/nano10122426 [doi]
LID - 2426
AB  - We present a study on the magnetic hyperthermia properties of graphene 
      oxide/magnetite (GO/MNP) nanocomposites to investigate their heat production 
      behavior upon the modification of the oxidation degree of the carbonaceous host. 
      Avoiding the harsh chemical conditions of the regular in situ 
      co-precipitation-based routes, the oppositely charged MNPs and GO nanosheets were 
      combined by the heterocoagulation process at pH ~ 5.5, which is a mild way to 
      synthesize composite nanostructures at room temperature. Nanocomposites prepared 
      at 1/5 and 1/10 GO/MNP mass ratios were reduced by NaBH(4) and L-ascorbic acid 
      (LAA) under acidic (pH ~ 3.5) and alkaline conditions (pH ~ 9.3). We demonstrate 
      that the pH has a crucial effect on the LAA-assisted conversion of graphene oxide 
      to reduced GO (rGO): alkaline reduction at higher GO loadings leads to doubled 
      heat production of the composite. Spectrophotometry proved that neither the 
      moderately acidic nor alkaline conditions promote the iron dissolution of the 
      magnetic core. Although the treatment with NaBH(4) also increased the 
      hyperthermic efficiency of aqueous GO/MNP nanocomposite suspensions, it caused a 
      drastic decline in their colloidal stability. However, considering the enhanced 
      heat production and the slightly improved stability of the rGO/MNP samples, the 
      reduction with LAA under alkaline condition is a more feasible way to improve the 
      hyperthermic efficiency of magnetically modified graphene oxides.
FAU - Illes, Erzsebet
AU  - Illes E
AUID- ORCID: 0000-0002-2901-9616
AD  - Department of Physical Chemistry and Materials Science, University of Szeged, 
      Rerrich Bela ter 1, H-6720 Szeged, Hungary.
FAU - Tombacz, Etelka
AU  - Tombacz E
AUID- ORCID: 0000-0002-2068-0459
AD  - Department of Physical Chemistry and Materials Science, University of Szeged, 
      Rerrich Bela ter 1, H-6720 Szeged, Hungary.
FAU - Hegedus, Zsofia
AU  - Hegedus Z
AD  - Department of Physical Chemistry and Materials Science, University of Szeged, 
      Rerrich Bela ter 1, H-6720 Szeged, Hungary.
FAU - Szabo, Tamas
AU  - Szabo T
AUID- ORCID: 0000-0001-8182-640X
AD  - Department of Physical Chemistry and Materials Science, University of Szeged, 
      Rerrich Bela ter 1, H-6720 Szeged, Hungary.
LA  - eng
GR  - FK-124851/Nemzeti Kutatasi Fejlesztesi es Innovacios Hivatal/
GR  - FK-131739/Nemzeti Kutatasi Fejlesztesi es Innovacios Hivatal/
PT  - Journal Article
DEP - 20201204
PL  - Switzerland
TA  - Nanomaterials (Basel)
JT  - Nanomaterials (Basel, Switzerland)
JID - 101610216
PMC - PMC7761925
OTO - NOTNLM
OT  - ascorbic acid
OT  - chemical reduction
OT  - graphene oxide
OT  - graphite oxide
OT  - heat production
OT  - heteroaggregation
OT  - magnetic hyperthermia
OT  - magnetite nanoparticles
OT  - nanocomposite dispersion
COIS- The authors declare no conflict of interest. The funders had no role in the 
      design of the study; in the collection, analyses, or interpretation of data; in 
      the writing of the manuscript, or in the decision to publish the results.
EDAT- 2020/12/10 06:00
MHDA- 2020/12/10 06:01
PMCR- 2020/12/04
CRDT- 2020/12/09 01:02
PHST- 2020/11/12 00:00 [received]
PHST- 2020/11/29 00:00 [revised]
PHST- 2020/12/02 00:00 [accepted]
PHST- 2020/12/09 01:02 [entrez]
PHST- 2020/12/10 06:00 [pubmed]
PHST- 2020/12/10 06:01 [medline]
PHST- 2020/12/04 00:00 [pmc-release]
AID - nano10122426 [pii]
AID - nanomaterials-10-02426 [pii]
AID - 10.3390/nano10122426 [doi]
PST - epublish
SO  - Nanomaterials (Basel). 2020 Dec 4;10(12):2426. doi: 10.3390/nano10122426.