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Amir Ullah,Muneeb-ur-Rahman,Muhammad Javid Iqbal,Chang Won Ahn,Ill Won Kim,Aman Ullah 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.12
The electrical properties of the 0.925(Bi0.5(Na0.40K0.10)TiO3-0.075(Ba0.70Sr0.30)TiO3 (0.925BNKT-0.075BST) ceramic were investigated by using AC impedance spectroscopy over a wide range of frequencies (10−2 105 Hz). The X-ray diffraction patterns confirmed the formation of a single-phase compound. A single semicircular arc in the impedance spectrum indicates that the main contribution of the bulk resistance (Rb) were due to grain effects, with Rb decreasing with increasing temperature. The conductivity of the ceramics increased with increasing temperature, and the activation energy resulting from the DC conductivity was 0.86 eV. The ceramic displayed a typical negative temperature coefficient of resistance (NTCR) behavior, like that of a semiconductor.
Static Magnetic Properties of Maghemite Nanoparticles
Zulfiqar,Muneeb Ur Rahman,M. Usman,Syed Khurshid Hasanain,Zia-ur-Rahman,Amir Ullah,Ill Won Kim 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.11
We report the static magnetic properties of Maghemite (-Fe2O3) nanoparticles with an averagecrystallite size of 14 ± 1.8 nm synthesized via a co-precipitation method. The zero-field-cooled(ZFC) and the field-cooled (FC) magnetization measurements were performed using a physicalproperties measurements system (PPMS) at temperatures from 5 K to 300 K. The ZFC/FC measurementsshowed a typical superparamagnetic behavior with a narrow size distribution.
Recent advancements of nitric oxide-releasing hydrogels for wound dressing applications
Hasan Nurhasni,Jiafu Cao,Mustopa Apon Zaenal,Himawan Achmad,Umami Rifqiyah Nur,Ullah Muneeb,Wathoni Nasrul,유진욱 한국약제학회 2023 Journal of Pharmaceutical Investigation Vol.53 No.6
Background Hydrogels are three-dimensional (3D) polymer networks that can absorb significant volumes of water inside their interstices and continue connecting these interstices while maintaining an inflated network structure; this capability is due to their unusual 3D crosslinked polymer meshwork structure. Hydrogels are promising wound dressings, particularly for chronic wounds, owing to their wound-healing properties, such as flexibility, adhesion, moisture control, biocompatibility, and biodegradability. Nitric oxide (NO) is a small molecule that has been thoroughly investigated for its wound-healing activity. The diverse roles of NO in wound healing require its stable delivery to the wound site. Thus, hydrogels have been evaluated as promising scaffolds for storing and releasing NO in a controlled manner to promote and accelerate wound healing. Area covered This review sought to introduce the types of polymers used to prepare hydrogel-based wound dressings and the types of NO donors used as wound healing promoters. The preparation method of the hydrogels and their physical and chemical properties were presented herein, and recent studies on NO-releasing hydrogels for wound therapy were summarized and discussed. Selected hydrogels with unique characteristics and significant findings for wound healing were also emphasized. Expert opinion Owing to the importance of chronic wounds in healthcare, the development of functional materials that support proper and rapid wound healing is required. NO-releasing hydrogels can be employed for wound dressing applications owing to their controlled NO releasability and antibacterial and wound healing activities.