Edge Of Meniscus Research Articles

Morphology and structure controlled fabrication of Cu2ZnSnS4 thin films by convective assembly deposition

Thin films of Cu2ZnSnS4 (CZTS) were prepared from colloidal solution and deposited by convective assembly deposition technique. This technique is capable to control the organization of thin layer on a substrate as a result of the evaporation-driven flow or the viscous-driven flow of colloids towards the edge of meniscus when the solution is dragged across the substrate. Then, capillary-driven forces bring particles into contact with each other and the substrate. In this approach, a variety of morphologies and structures of CZTS thin films could be obtained depending mainly on the controlled deposition conditions. This work aimed to incorporate the simple yet efficient technique with detailed investigation of effects of operating parameters, including velocity of the substrate (500–1250 µm/s), annealing temperature (340–550 °C) and substrate type (glass slide and molybdenum-coated soda lime glass, Mo-coated SLG), on the properties of resulting CZTS thin films. Different morphologies of CZTS films were derived due to the effect of velocity. Furthermore, higher velocity resulted in thicker films, implying that the mechanism of convective flow in the meniscus of colloidal solution and the subsequent film formation was predominantly driven by the viscous drag. Annealing temperature strongly influenced grain growth, composition variation and enhancement of crystallinity. A unique porous structure of CZTS thin film could be obtained by deposition at a controlled velocity using Mo-coated SLG as a substrate. The key advantage of this work is the control of morphology and structure of CZTS films for various desired applications including solar cells and photoelectrochemical devices.

Normal and transplanted lateral knee menisci: evaluation of extrusion using magnetic resonance imaging and ultrasound.

The aim of the study is to develop a clinically useful and reproducible method for evaluating lateral meniscal extrusion in normal and transplanted knees under different axial loading conditions. Magnetic resonance imaging (MRI) and ultrasound (US) were used to assess meniscal extrusion. Both types of imaging were performed at least 6 months postoperatively (mean 23.5 months). Coronal MR images (DESS-3D sequence) of the lateral compartments of 10 normal knees and 17 transplanted lateral knees were analyzed. Extrusion was defined as the distance measured from the femoral condyle or tibial plateau to the outer edge of the meniscus. Subjects were examined in the supine position. Ultrasound print-outs of the lateral compartment of both knees of ten patients (transplanted side and contralateral normal side) were analyzed. Extrusion cross-sectional area (CSA) and distance were measured just anterior to the lateral collateral ligament: the former was defined as the CSA of the meniscus outside the knee, the latter as the greatest distance from a line connecting the femur and tibia to the outer edge of the lateral meniscus. Patients were examined in the supine position, bipodal stance and unipodal stance. The viable meniscal allograft was securely sutured to a bleeding functional meniscal rim. No bone blocks were used to fix the allograft; instead, the anterior and posterior horn were firmly sutured to their enthesis. The MRI results (tibial) show the transplanted lateral meniscus to be significantly (p<0.005) more extruded in comparison to the normal lateral meniscus. The anterior horn (mean 5.8 mm, SD=2.8) of the transplanted lateral meniscus tends to be more extruded than the posterior horn (mean 2.7 mm, SD=1.48). The posterior horn of the normal lateral meniscus does not (mean 0 mm) extrude, while the mean extrusion of the anterior horn is 0.8 mm (SD=0.92). In the US results, the transplanted lateral meniscus is significantly (p<0.005) more extruded than the normal lateral meniscus in all patient positions. Both cross-sectional surface and distance are equally good parameters to determine meniscal extrusion. There is no statistical difference between patient positions. The transplanted lateral meniscus extrudes, in the supine position, bipodal and unipodal stance 6.43 (SD=1.84), 6.01 (SD=1.93) and 6.99 mm (SD=2.7) respectively. The extrusion surface of the lateral transplanted meniscus is 50.50 mm2 (SD=15.32), 47.24 mm2 (SD=14.35) and 58.61 mm2 (SD=29.65) in the supine position, bipodal stance and unipodal stance respectively. The normal lateral meniscus extrudes in the supine position, bipodal and unipodal stance 3.77 (SD=1.76), 3.94 (SD=1.66) and 3.79 mm (SD=1.79) respectively. The extrusion surface of the normal lateral meniscus is 22.42 mm2 (SD=12.54), 23.24 mm2 (SD=12.74) and 24.79 mm2 (SD=10.18) in the supine position, bipodal stance and unipodal stance respectively. The presented data shows that the transplanted lateral meniscus, without bone block fixation but with firm fixation of the horns to the original entheses, extrudes in the lateral direction significantly more than the normal meniscus. The transplanted lateral meniscus, however, does not extrude more in the lateral direction under axial load. The anterior horn of both normal and transplanted menisci is extruded more laterally than the posterior horn. Both methods are adequate to measure laterally-directed extrusion of the normal and transplanted lateral meniscus, but have distinctive advantages and disadvantages: MRI in this series visualizes the complete-from posterior to anterior-meniscal body, but only in the supine, non-weight-bearing position. Using ultrasound one can evaluate the meniscal extrusion in different conditions of axial loading, but only from a single examination point.