Synthesis of nickel zinc iron nanoparticles by coprecipitation technique

Nanoparticles nickel ferrite of size 6 - 8 nm, synthesized by the coprecipitation method with x varying from 0 to 1.0. The powder samples were characterized by XRD, VSM and FTIR. The average crystallite sizes of the particles were determined from X-ray diffraction. X-ray analysis showed that the samples were cubic spinel. The lattice constant (a o) increased with the increase in zinc substitution. The specific saturation magnetization (M S) of the particles was measured at room temperature. The magnetic parameter of M S, was found to decrease with the increase in zinc substitution. Fourier transform infrared spectroscopy (FTIR) spectra of the Ni1-xZn xFe2O4 with x = 0, 0.5, 1 in the range 400 - 4000 cm-1 were reported. The spinel structure and the crystalline water adsorption of Ni1-xZn xFe2O4 nanoparticles were studied by using FTIR

Secondary Erosive Arthritis in a Young Lady – A Rare Manifestation of Primary Antiphospholipid Antibody Syndrome

Introduction: Arthritis in primary antiphospholipid antibody syndrome (PAPS) is a rare manifestation that is much more common in secondary antiphospholipid antibody syndrome (APS), particularly those associated with systemic lupus erythematosis (SLE), and has been reported to be non-erosive responding to conservative management. In this background, we describe a case of secondary erosive arthritis of knee (SEAK) in a female patient with PAPS. Case Report: Thirty-seven-year-old working women presented with chronic right knee pain for the past 2 years which was increasing in severity and interfering with her activities of daily living for the past 3 months. The patient was a known case of PAPS with a history of one early and one late abortion. On radiological examination, Grade IV secondary osteoarthritis knee was made out. The patient underwent total knee replacement. At 2 years follow-up, the patient had a good functional outcome. To the best of our knowledge, this is the first report of secondary osteoarthritis in PAPS requiring arthroplasty. Perioperative management is crucial in PAPS to prevent thromboembolic complications. Multimodality approach with strict patient compliance is a key to achieve good functional recovery. Conclusion: SEAK can be a rare presentation of PAPS. Secondary causes like SLE or rheumatoid arthritis must be ruled out before a diagnosis of PAPS is made. Perioperative management in APS is critical and challenging. Multidisciplinary team approach involving internal medicine, anesthesiology, orthopedics, and rehabilitative departments is essential. Key words: Antiphospholipid syndrome, arthritis, knee replacement arthroplasty.</jats:p

Surgical strategies in management of ankylosed bilateral hips and knees in crouched posture

A 26-year-old wheelchair-bound man was brought to our institute with progressive painful deformity of both lower limbs involving bilateral hip and knee for the past 5 years. The patient was wheelchair-bound for the past 18 months. He was only able to crawl to meet his locomotor demands. On examination, the patient was in a crouched posture with mild kyphosis at the thoracolumbar region and ankylosis of bilateral hip and knee in an unfavourable position. Radiological and serological evaluation diagnosed him to be a case of neglected ankylosing spondylosis. We planned for arthroplasty of the bilateral hip and knee for correcting his posture and to regain his locomotor ability. The severity of the deformity mandated extensive releases and the handling of neurovascular structures. Hence, a holistic treatment plan with various surgical strategies was devised to manage his deformities. The patient made a good recovery and regained his locomotor ability without any major complications at a 2-year follow-up.</jats:p

Thermogravimetric and magneticproperties of Ni1-X Zn xFe2O4 nanoparticles synthesized by coprecipitation

Ni1-xZn xFe2O4 (x = 0 to 1) nanoparticles of size less than 9 nm were prepared by a chemical coprecipitation method which could be used for ferrofluid preparation. XRD, VSM and DTA-TG (STA) were used to study the effect of variation in Zn substitution and its influence on particle size, magnetic properties such as M S, H C and Curie temperature, as well as on the water content. ICP was used to estimate Ni, Zn and Fe concentrations. The average crystallite size (DaveXR) of the particles was found to decrease from 8.95 to 6.92 nm with increasing zinc substitution. The lattice constant (a o) increased with increasing zinc substitution. The specific saturation magnetization (M S) of the particles was measured at room temperature. Magnetic parameters such as M S, Hc, and Mr were found to decrease with increasing zinc substitution. Estimation of the water content, which varies the Zn concentration, plays a vital role for the correct determination of cation contents. The Curie temperature was found to decrease with increasing zinc substitution