PMID- 37849204
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20231020
IS  - 2470-0053 (Electronic)
IS  - 2470-0045 (Linking)
VI  - 108
IP  - 3-1
DP  - 2023 Sep
TI  - Effect of CdSe/ZnS quantum dot dispersion on phase transitional behavior of 8OCB 
      liquid crystal.
PG  - 034701
LID - 10.1103/PhysRevE.108.034701 [doi]
AB  - We report the effect on the phase transitional behavior of 8OCB liquid crystal 
      (LC) doped with functionalized CdSe/ZnS quantum dots (QDs) in different 
      concentrations. The temperature-dependent data of high-resolution optical 
      birefringence and dielectric anisotropy are utilized to characterize the critical 
      anomaly for both the isotropic-to-nematic (I-N) and nematic-to-smectic-A (N-SmA) 
      phase transitions. The obtained results reveal that the order parameter exponent 
      (beta) for the pure LC is found to be beta=0.249 and does not vary upon the inclusion 
      of QDs in the pure matrix. It describes the weakly first-order characteristic of 
      the I-N phase transition for all the studied samples, which falls within the 
      limit of the tricritical hypothesis. Conversely, depending on the range of the N 
      phase, we observed a nonuniversal nature of the specific heat capacity critical 
      exponent (alpha;') linked with the N-SmA phase transition for all the studied 
      samples. A relative comparison was made amongst the alpha;' values extracted from 
      both the anisotropy data, and further, a theoretical relationship is established 
      with these exponent values. The coupling strength among the N and SmA order 
      parameters is determined using the optical birefringence data and discussed from 
      the perspective of mutual interaction between the LC-QDs ligands. The results 
      signify that a strong ligand-ligand interaction between neighboring QDs 
      effectively reduces the N range and slightly influences the N-SmA phase 
      transition.
FAU - Rani, Aysha
AU  - Rani A
AD  - Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 
      110016, India.
FAU - Chakraborty, Susanta
AU  - Chakraborty S
AD  - Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 
      110016, India.
FAU - Sinha, Aloka
AU  - Sinha A
AD  - Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 
      110016, India.
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Phys Rev E
JT  - Physical review. E
JID - 101676019
SB  - IM
EDAT- 2023/10/18 06:42
MHDA- 2023/10/18 06:43
CRDT- 2023/10/18 01:07
PHST- 2023/03/23 00:00 [received]
PHST- 2023/07/10 00:00 [accepted]
PHST- 2023/10/18 06:43 [medline]
PHST- 2023/10/18 06:42 [pubmed]
PHST- 2023/10/18 01:07 [entrez]
AID - 10.1103/PhysRevE.108.034701 [doi]
PST - ppublish
SO  - Phys Rev E. 2023 Sep;108(3-1):034701. doi: 10.1103/PhysRevE.108.034701.