A Novel Routine for the Fabrication of Y-Type Oxotitanium Phthalocyanine Nanocrystals in High-Gravity Rotating Packed Beds

Abstract

In this work, external circulation rotating packed bed (EX-RPB) was combined with internal circulation rotating packed bed (IN-RPB) for the preparation of Y-type oxotitanium phthalocyanine nanocrystals (Y-TiOPc NCs) for the first time. The operating conditions in EX-RPB and in IN-RPB were investigated in detail. X-ray diffraction (XRD), transmission electron microscopy (TEM), ultraviolet–visible (UV-vis) absorption spectroscopy analysis, and elemental analysis were performed, and xerographic properties were analyzed, to characterize the products. The experimental results indicated Y-TiOPc NCs with the average size of 6 nm were successfully prepared. The Q-band absorption peak of Y-TiOPc NCs centered at 782 nm, implying their potential application in the xerographic photoreceptors of laser printers. The photoreceptor fabricated with Y-TiOPc NCs exhibited an initial surface potential of 703.56 V, a photosensitivity of 0.166 μJ/cm2, a residual potential of 26.48 V, and a dark decay rate of 10.64 V/s. This work made a significant improvement to control the crystal form of nanoparticles at a large scale.

Controlling Nucleation and Fabricating Nanoparticulate Formulation of Sorafenib Using a High-Gravity Rotating Packed Bed

“…The basic principle of preparation of SFN NF by high-gravity technology is to perform the precipitation process under a high-gravity environment via the action of centrifugal force in RPB, which is reflected by the value of β. β is determined by eq : where n is the rotating speed of RPB (rpm), g the acceleration of gravity (m/s 2 ), r 1 the inner radius of packing (m), and r 2 is the outer radius of packing (m). Briefly, the solvent phase (SP) was prepared by adding SFN (750 mg) into MeOH (50 mL), followed by filtering.…”

Green synthesis of CuO- and Cu2O-NPs in assistance with high-gravity: The flowering of nanobiotechnology

“…The synthesized nanoparticles were filtered and centrifuged at 12 000 rpm for about 20 min. Furthermore, by the equation of Wu et al [37,38], the mean high gravity factor…”

High-Gravity-Assisted Intensified Preparation of Er-Doped and Yb/Er-Codoped CaF2 Upconversion Nanophosphors for Noncontact Temperature Measurement

“…High-gravity technology is a highly efficient process intensification method by means of a rotating packed bed (RPB). The characteristic t M for the RPB reactor is estimated to be on the order of 0.01–0.1 ms, much lower than t N . , Under the powerful rotation and porous packing inside the RPB reactor, liquid-containing reactants are split into droplets, threads, and thin films (Figure a). − As a result, a greatly intensified micromixing and mass transfer − process can be achieved, which is very helpful to the formation of homogeneous reaction surroundings and a high supersaturation degree in the precipitation process. Therefore, it is very suitable for the synthesis of UC nanophosphors with homogeneous doping of rare earth ions and narrow PSDs.…”