Optically active porous hybrid particles constructed by alkynylated cellulose nanocrystals, helical substituted polyacetylene, and inorganic silica for enantio‐differentiating towards naproxen

Analysis methods developed specifically to determine the presence of ink and other optically active components in paper machine white waters or other process effluents are not available. It is generally more interest¬ing to quantify the effect of circulation water contaminants on end products. This study compares optical techniques to quantify the dirt in process water by two methods for test media preparation and measurement: direct process water filtration on a membrane foil and low-grammage sheet formation. The results show that ink content values obtained from various analyses cannot be directly compared because of fundamental issues involving test media preparation and the varied methodologies used to formulate the results, which may be based on different sets of assumptions. The use of brightness, luminosity, and reflectance and the role of scattering measurements as a part of ink content analysis are discussed, along with fine materials retention and measurement media selection. The study concludes with practical tips for case-dependent measurement methodology selection.

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Starch Based Bioplastics Reinforced with Cellulose Nanocrystals from Agricultural Residues

International Conference on Advances in Engineering and Technology (ICAET'2014) March 29-30, 2014 Singapore ◽

10.15242/iie.e0314037 ◽

2014 ◽

Keyword(s):

Cellulose Nanocrystals ◽

Agricultural Residues

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Microscopic Structure of Er-Related Optically Active Centers in Si

MRS Proceedings ◽

10.1557/proc-770-i7.1 ◽

2003 ◽

Vol 770 ◽

Author(s):

H. Przybylinska ◽

N. Q. Vinh ◽

B.A. Andreev ◽

Z. F. Krasil'nik ◽

T. Gregorkiewicz

Keyword(s):

Ground State ◽

Photoluminescence Spectrum ◽

Zeeman Effect ◽

Optically Active ◽

Single Type ◽

Active Centers ◽

Mbe Growth ◽

Spectral Components ◽

Er Doped ◽

Successful Observation

AbstractA successful observation and analysis of the Zeeman effect on the near 1.54 μm photoluminescence spectrum in Er-doped crystalline MBE-grown silicon are reported. A clearly resolved splitting of 5 major spectral components was observed in magnetic fields up to 5.5 T. Based on the analysis of the data the symmetry of the dominant optically active center was conclusively established as orthorhombic I (C2v), with g‼≈18.4 and g⊥≈0 in the ground state. The fact that g⊥≈0 explains why EPR detection of Er-related optically active centers in silicon may be difficult. Preferential generation of a single type of an optically active Er-related center in MBE growth confirmed in this study is essential for photonic applications of Si:Er.

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Nanostructured Clay-Lipid Hybrid Particles for Controlling the Gastrointestinal Solubilization of Poorly Bioavailable Antipsychotic Drugs

10.26226/morressier.57d6b2b9d462b8028d88dc25 ◽

2016 ◽

Author(s):

Tahnee Dening

Keyword(s):

Antipsychotic Drugs ◽

Hybrid Particles

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Tuning the Magnetic Alignment of Cellulose Nanocrystals from Perpendicular to Parallel Using Lepidocrocite Nanoparticles

10.26434/chemrxiv.8061839.v2 ◽

2019 ◽

Author(s):

Valentina Guccini ◽

Sugam Kumar ◽

Yulia Trushkina ◽

Gergely Nagy ◽

Christina Schütz ◽

...

Keyword(s):

Magnetic Field ◽

Magnetic Fields ◽

Cellulose Nanocrystals ◽

Small Angle Neutron Scattering ◽

Lower Amount ◽

Magnetic Alignment ◽

Polarized Optical Microscopy ◽

Parallel Orientation ◽

Weak Magnetic Fields

The magnetic alignment of cellulose nanocrystals (CNC) and lepidocrocite nanorods (LpN), pristine and in hybrid suspensions has been investigated using contrast-matched small-angle neutron scattering (SANS) under in situ magnetic fields (0 – 6.8 T) and polarized optical microscopy. The pristine CNC (diamagnetic) and pristine LpN (paramagnetic) align perpendicular and parallel to the direction of field, respectively. The alignment of both the nanoparticles in their hybrid suspensions depends on the relative amount of the two components (CNC and LpN) and strength of the applied magnetic field. In the presence of 10 wt% LpN and fields < 1.0 T, the CNC align parallel to the field. In the hybrid containing lower amount of LpN (1 wt%), the ordering of CNC is partially frustrated in all range of magnetic field. At the same time, the LpN shows both perpendicular and parallel orientation, in the presence of CNC. This study highlights that the natural perpendicular ordering of CNC can be switched to parallel by weak magnetic fields and the incorporation of paramagnetic nanoparticle as LpN, as well it gives a method to influence the orientation of LpN.<br>

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