scholarly journals AGGREGATION OF P-TERPHENYL ALONG WITH PMMA/SA AT THE LANGMUIR AND LANGMUIR–BLODGETT FILMS

2008 ◽  
Vol 15 (04) ◽  
pp. 459-467 ◽  
Author(s):  
SYED ARSHAD HUSSAIN ◽  
MD. N. ISLAM ◽  
HUGO LEEMAN ◽  
DEBAJYOTI BHATTACHARJEE
Keyword(s):  
Spectroscopic Studies ◽  
Molecular Aggregation ◽  
Water Interface ◽  
Electron Micrograph ◽  
Scanning Electron Micrograph ◽  
Langmuir Blodgett ◽  
Air Water Interface ◽  
The Matrix ◽  
Langmuir Blodgett Films ◽  
Scanning Electron

Molecular aggregation and monolayer characteristics of non-amphiphilic p-terphenyl (TP) mixed with either polymethyl methacrylate (PMMA) or stearic acid (SA) at the air–water interface were investigated. The miscibility of the two components was evaluated by measuring and analyzing surface pressure versus area per molecule (π–A) isotherm. Both attractive and repulsive interactions between the sample (TP) and the matrix (PMMA or SA) were observed depending on the composition and microenvironment. TP and PMMA/SA were not completely miscible in the mixed monolayer. Aggregation and phase separation between sample TP and matrix molecule were revealed by UV–Vis absorption spectroscopic studies and confirmed by scanning electron micrograph of Langmuir–Blodgett films.

SPECTROSCOPIC CHARACTERIZATIONS OF NONAMPHIPHILIC 2,5-BIS (5-TERT-BUTYL-BENZOXAZOLYL)-THIOPHENE MOLECULES AT THE AIR–WATER INTERFACE AND IN LANGMUIR–BLODGETT FILMS

2008 ◽  
Vol 15 (06) ◽  
pp. 889-896 ◽  
Author(s):  
S. BISWAS ◽  
SYED ARSHAD HUSSAIN ◽  
D. BHATTACHARJEE
Keyword(s):  
Phase Transition ◽  
Surface Pressure ◽  
Spectroscopic Studies ◽  
Repulsive Interaction ◽  
Water Interface ◽  
Thiophene Derivative ◽  
Langmuir Blodgett ◽  
Tert Butyl ◽  
Air Water Interface ◽  
Langmuir Blodgett Films

This paper reports the π–A isotherm and spectroscopic characterizations of mixed Langmuir and Langmuir–Blodgett films of a nonamphiphilic thiophene derivative, namely, 2,5-Bis (5-tert-butyl-benzoxazolyl)-thiophene (BBOT) molecules, mixed with polymethyl methacrylate (PMMA) and stearic acid (SA). The π–A isotherms and molefraction vs. area per molecule studies indicate some repulsive interaction between sample (BBOT) and matrix (PMMA or SA) molecules. At higher surface pressure in the SA mixed BBOT Langmuir monolayer, a phase transition occurs, which has been revealed by π–A isotherm studies. UV-vis absorption and fluorescence spectroscopic studies confirm this phase transition and closer association of BBOT molecules. Spectroscopic studies of LB films lifted at higher surface pressure clearly confirm the presence of dimmers and higher-order n-meric sites.

Chlorophyll a–violaxanthin interactions in monolayers at air–water interface and in Langmuir–Blodgett films

2000 ◽  
Vol 19 (2) ◽  
pp. 117-125 ◽  
Author(s):  
Wieslaw I Gruszecki ◽  
Bogumil Zelent ◽  
Heidar-Ali Tajmir-Riahi ◽  
Gongming Wang ◽  
Toufik Taleb ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Water Interface ◽  
Langmuir Blodgett ◽  
Air Water Interface ◽  
Langmuir Blodgett Films
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