PMID- 37601923
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20230823
IS  - 2694-2496 (Electronic)
IS  - 2694-2496 (Linking)
VI  - 3
IP  - 4
DP  - 2023 Aug 16
TI  - Controlling the Structure and Morphology of Organic Nanofilaments Using External 
      Stimuli.
PG  - 295-309
LID - 10.1021/acsnanoscienceau.3c00005 [doi]
AB  - In our continuing pursuit to generate, understand, and control the morphology of 
      organic nanofilaments formed by molecules with a bent molecular shape, we here 
      report on two bent-core molecules specifically designed to permit a phase or 
      morphology change upon exposure to an applied electric field or irradiation with 
      UV light. To trigger a response to an applied electric field, conformationally 
      rigid chiral (S,S)-2,3-difluorooctyloxy side chains were introduced, and to cause 
      a response to UV light, an azobenzene core was incorporated into one of the arms 
      of the rigid bent core. The phase behavior as well as structure and morphology of 
      the formed phases and nanofilaments were analyzed using differential scanning 
      calorimetry, cross-polarized optical microscopy, circular dichroism 
      spectropolarimetry, scanning and transmission electron microscopy, UV-vis 
      spectrophotometry, as well as X-ray diffraction experiments. Both bent-core 
      molecules were characterized by the coexistence of two nanoscale morphologies, 
      specifically helical nanofilaments (HNFs) and layered nanocylinders, prior to 
      exposure to an external stimulus and independent of the cooling rate from the 
      isotropic liquid. The application of an electric field triggers the disappearance 
      of crystalline nanofilaments and instead leads to the formation of a tilted 
      smectic liquid crystal phase for the material featuring chiral difluorinated side 
      chains, whereas irradiation with UV light results in the disappearance of the 
      nanocylinders and the sole formation of HNFs for the azobenzene-containing 
      material. Combined results of this experimental study reveal that in addition to 
      controlling the rate of cooling, applied electric fields and UV irradiation can 
      be used to expand the toolkit for structural and morphological control of 
      suitably designed bent-core molecule-based structures at the nanoscale.
CI  - (c) 2023 The Authors. Published by American Chemical Society.
FAU - Sezgin, Baris
AU  - Sezgin B
AUID- ORCID: 0000-0001-5359-4488
AD  - Department of Chemistry, Suleyman Demirel University, 32260 Isparta, Cunur, 
      Turkey.
AD  - Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, 
      Ohio 44242 United States.
FAU - Liu, Jiao
AU  - Liu J
AD  - Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, 
      Ohio 44242 United States.
AD  - Materials Science Graduate Program, Kent State University, Kent, Ohio 44242 
      United States.
FAU - N Goncalves, Diana P
AU  - N Goncalves DP
AD  - Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, 
      Ohio 44242 United States.
AD  - Department of Chemistry and Biochemistry, Kent State University, Kent, Ohio 44242 
      United States.
FAU - Zhu, Chenhui
AU  - Zhu C
AD  - Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, 
      California 94720 United States.
FAU - Tilki, Tahir
AU  - Tilki T
AD  - Department of Chemistry, Suleyman Demirel University, 32260 Isparta, Cunur, 
      Turkey.
FAU - Prevot, Marianne E
AU  - Prevot ME
AD  - Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, 
      Ohio 44242 United States.
FAU - Hegmann, Torsten
AU  - Hegmann T
AUID- ORCID: 0000-0002-6664-6598
AD  - Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, 
      Ohio 44242 United States.
AD  - Materials Science Graduate Program, Kent State University, Kent, Ohio 44242 
      United States.
AD  - Department of Chemistry and Biochemistry, Kent State University, Kent, Ohio 44242 
      United States.
AD  - Brain Health Research Institute, Kent State University, Kent, Ohio 44242 United 
      States.
LA  - eng
PT  - Journal Article
DEP - 20230418
PL  - United States
TA  - ACS Nanosci Au
JT  - ACS nanoscience Au
JID - 9918316881006676
PMC - PMC10436377
COIS- The authors declare no competing financial interest.
EDAT- 2023/08/21 06:42
MHDA- 2023/08/21 06:43
PMCR- 2023/04/18
CRDT- 2023/08/21 05:07
PHST- 2023/01/30 00:00 [received]
PHST- 2023/04/05 00:00 [revised]
PHST- 2023/04/06 00:00 [accepted]
PHST- 2023/08/21 06:43 [medline]
PHST- 2023/08/21 06:42 [pubmed]
PHST- 2023/08/21 05:07 [entrez]
PHST- 2023/04/18 00:00 [pmc-release]
AID - 10.1021/acsnanoscienceau.3c00005 [doi]
PST - epublish
SO  - ACS Nanosci Au. 2023 Apr 18;3(4):295-309. doi: 10.1021/acsnanoscienceau.3c00005. 
      eCollection 2023 Aug 16.