Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Effects of subphase pH, temperature and ionic strength on the aggregation behavior of PnBA-b-PAA at the air/water interface
Δημιουργός/Συγγραφέας:	Wang Y. Wen G. [EL] Πίσπας, Στέργιος[EN] Pispas, Stergios Yang S. You K.
Εκδότης:	Academic Press Inc.
Ημερομηνία:	2018
Γλώσσα:	Αγγλικά
ISSN:	0021-9797
DOI:	10.1016/j.jcis.2017.11.002
Άλλο:	PubMed ID: 29127824
Περίληψη:	Aggregation behavior of an amphiphilic diblock polyelectrolyte poly(n-butylacrylate)-b-poly(acrylic acid) (PnBA-b-PAA) at the air/water interface and morphologies of its LB films were characterized by the Langmuir monolayer technique and atomic force microscopy (AFM), respectively. Effects of subphase pH, temperature and ionic strength on the isotherms and hysteresis curves of the PnBA-b-PAA monolayers and the morphologies of its LB films were systematically studied. With the increase of subphase pH, the isotherms shift negatively and the quasi-plateaus disappear under neutral and alkaline conditions. Hysteresis phenomena of the PnBA-b-PAA monolayers on acidic and neutral subphases are quite obvious and similar, while the compression and expansion isotherms under alkaline condition are almost overlapped. The LB films of PnBA-b-PAA transferred from acidic subphase exhibit isolated circular micelles with large size, while those from alkaline subphase exhibit condensed ones with small size. With the rise in subphase temperature, PnBA blocks on the water surface are more likely to aggregate into large cores due to the higher molecular mobility. Furthermore, the totally ringlike nanostructures prepared from alkaline subphase with medium ionic strength are observed for the first time in LB films of block copolymers.
Τίτλος πηγής δημοσίευσης:	Journal of Colloid and Interface Science
Τόμος/Κεφάλαιο:	512
Σελίδες:	862-870
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry
Λέξεις-Κλειδιά:	Block copolymer Ionic strength LB film PnBA-b-PAA Polyelectrolyte Subphase pH
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2017 Elsevier Inc.
Σημειώσεις:	Natural Science Foundation of Heilongjiang Province: B2015023 This work was supported by the Natural Science Fund of Heilongjiang Province [grant number B2015023 ].
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο