Circular birefringence of banded spherulites
WebCircular Birefringence of Banded Spherulites Xiaoyan Cui,†Alexander G. Shtukenberg,*, †John Freudenthal,†Shane Nichols,†Bart Kahr*† †Department of Chemistry, New York … WebThe circular birefringence is shown to be a consequence of misoriented, overlapping anisotropic lamellae, a kind of optical activity associated with the mesoscale …
Circular birefringence of banded spherulites
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WebFeb 15, 2024 · Banded spherulites are unique phenomena that can be found in the crystallization of substances, such as polymers, small compounds, or the combination of the two. Periodic changes of height profile and birefringence along the radial directions make banded spherulites more attractive than other spherulitic morphologies. WebJul 12, 2024 · Two types of birefringent banded spherulites observed under polarized optical microscope: (a) Single banded spherulites of PLLA; (b) double banded …
WebMar 6, 2013 · Mueller matrix imaging reveals radial oscillations in not only linear birefringence, but also circular birefringence, whose origin is explained through slight (∼1.3°) but systematic splaying... Webcircular crack was observed in the non-banded spherulite, while multiple circular cracks were concentrically formed in the banded spherulite. For both spherulites, brightness of …
WebJul 1, 2015 · A recent article [29] has just attempted to address the inherent constraint of analyses based on only the top-surface morphology of ring-banded polymers spherulites, which may not suffice in... WebApr 28, 2004 · The lamellae exhibit complicated growth behaviors: twisting, bending, backward growth, and branching. The lamellae continuously twist to show alternating edge-on and flat-on views along the radii of the spherulites. Giant screw dislocations bring forth to the birth of new lamellae.
WebOct 29, 2015 · Neat poly (1,6-hexamethylene adipate) (PHA) is one polyester that never forms ring banded spherulite when crystallized at any crystallization temperatures ( Tc s). However, PHA spherulites readily transform from negative-type at low Tc s (32–38 °C) to positive-type at high Tc s (46–48 °C).
WebOct 1, 2015 · There are many other types of “bands” in crystallized spherulites – including “radial stripes” with alternate birefringence colors as bands – periodic bands – because … how does bone grow in lengthWebMar 13, 2014 · Circular birefringence (CB) has recently been used to interrogate banded spherulites. Cui et al. [45] observe that CB oscillates along the radius, 90 • out of phase … photo booth hire christchurchWebThere are two types of spherulites grown from the melt at high temperature (up to 60 °C). The most common is a spherulite from the nonpolar phase (α form), which is larger and has high birefringence and tightly spaced concentric bonding. The second type is smaller and has less birefringence, and comes from the γ phase. how does bone cancer progressWebNov 7, 2024 · Substrates partially covered with F10H16 contain incomplete ring-banded spherulites and smaller objects in which lamellae and circular nanodomains co-exist. … photo booth hire central coastWebSep 7, 2011 · The circular birefringence of polycrystalline polymers is invariably obscured by strong linear birefringence. To parse the two mechanisms of light retardation, polycrystalline spherulites of polylactide enantiomers were … how does bone broth workWebMar 6, 2013 · Mueller matrix imaging reveals radial oscillations in not only linear birefringence, but also circular birefringence, whose origin is explained through slight (∼1.3°) but systematic splaying of individual lamellae in the film. how does bone grow and remodelWebFrom the birefringence point of view, spherulites can be positive or negative. This distinction depends not on the orientation of the molecules (parallel or perpendicular to … photo booth hire bournemouth