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Performance Behavior of Chitosan Based Water Dispersible Polyurethanes: Physicochemical Properties
Noureen Arshad,Khalid Mahmood Zia,Farukh Jabeen,Muhammad Naveed Anjum,Nadia Akram,Muhammad Kaleem Khosa 한국섬유공학회 2018 Fibers and polymers Vol.19 No.11
The research work was carried out to synthesize a series of novel chitosan based water dispersible polyurethanes (CS-WDPUs). The three step synthesis involves the formation of end capped PU-prepolymer was formed through the reaction between polyethylene glycol (PEG) (Mn=600 g/mole, dimethylolpropionic acid (DMPA) and isophorone diisocyanate (IPDI) followed by the preparation of neutralized NCO terminated PU-prepolymer, which lead to the chain extension by using the chitosan. The dispersion of the obtained product was carried out by adding proper proportion of water. The synthesized CS-WDPUs were applied onto the different qualities of plain weave poly-cotton printed and dyed textile swatches by employing pad-dry-cure procedures. The textile assets of the treated and untreated textile swatches were assessed, as color fastness, pilling resistance, tear and tensile strength. The results showed that the chitosan incorporation into PU backbone has significant effect on the assets of treated textiles. These synthesized CS-WDPUs are eco-friendly bio-based finishes with potential applications for polyester/cotton textiles.
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Abdul Rafay Qazi,Faizan Iqbal,Syed Shahid Noor,Nasir Ahmed,Akram Ali Uddin,Nouman Memon,Naveed Memon 대한정형외과학회 2021 Clinics in Orthopedic Surgery Vol.13 No.1
Background: Due to extensive fibrosis during revision surgery, adequate exposure is essential and it can be achieved with several extensile approach options, such as tibial tubercle osteotomy. Information regarding surgical exposure during revision arthroplasty is limited in developing countries, such as Pakistan, due to the lack of adequate data collection and follow-up. Therefore, the purpose of this study was to evaluate the impact of tibial tubercle osteotomy on final outcome of revision total knee arthroplasty (TKA). Methods: A total of 231 revision TKAs were performed between January 2008 and December 2017. Twenty-nine patients underwent tibial tubercle osteotomy for adequate exposure during revision surgery. Of these, 27 patients with complete follow-up were included in our study. Factors examined include age at the time of revision surgery, gender, comorbidities, arthroplasty site (right or left), body mass index (BMI), and primary indications for the tibial tubercle osteotomy during revision TKA. Functional outcome was measured by using Knee Society score (KSS) at 3 months and the final follow-up. All statistical analysis was done using SPSS version 20.0 with a p-value < 0.05 considered significant. Results: Out of 27 patients, 6 patients (22.2%) were men and 21 patients (77.7%) were women. Right knee revision arthroplasty was performed in 15 patients (55.5%), left knee revision arthroplasty was performed in 12 patients (44.4%), and bilateral revision surgery was performed in only 1 patient (3.7%). The mean BMI was 29.2 kg/m2. We used a constrained condylar knee in 20 patients (74%), a rotating hinge knee in 5 patients (18.5%), and mobile bearing tray plus metaphyseal sleeves in 2 patients (7.4%). The KSS was 52.21 ± 4.05 preoperatively, and 79.42 ± 2.2 and 80.12 ± 1.33 at 3 months and 12 months, respectively. Radiological union was achieved in all patients at 3 months. Of 27 patients, only 1 patient (3.7%) had proximal migration of the osteotomy site at 6 months: the patient was asymptomatic and union was also achieved and, therefore, no surgical intervention was performed. Conclusions: Tibial tubercle osteotomy during revision TKA can be a safe and reliable technique with superior outcomes and minimal complication rates.
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Muhammad Yasir Khalid,Ans Al Rashid,Zulkarnain Abbas,Naveed Akram,Zia Ullah Arif,Fausto Pedro Garcia Marquez 한국고분자학회 2021 폴리머 Vol.45 No.3
The improvement in mechanical properties of biodegradable and sustainable materials like natural fibers turns out to be exceptionally appealing from the financial and biological perspectives. This is achieved by hybridization technique in which different fiber orientations can be adjusted in various arrangements providing variety in its properties. In this study, the authors used different natural fibers in hybridization with glass fibers. The tensile strength of varying glass/sisal and glass/jute contents within the composites were compared. Besides, the effect of hybridization was analyzed. Results revealed that all hybrid composites show low tensile strength as compared to the non-hybrid composites. However, in hybrid composites, the laminate containing a single layer of sisal fiber has shown almost the same tensile strength as non-hybrid composites. Based on results, it is suggested that flax is an appropriate natural fiber to replace E-glass for applications requiring similar strength.
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Acoustic Modes of Multi-Ion Dusty Plasmas
N. Ahmad,Majeed Ur Rehman,M. N. S. Qureshi,Y. Al-Hadeethi,A. A. Abid,Naveed Akram 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.9
In this manuscript, we aim to derive a general dispersion relation applicable to a multi-component dusty plasma including massive negatively charged dust particles, both negative and positive ions, and electrons. Using the fluid treatment of plasma, we derive dispersion relations for dust ion-acoustic waves (DIAWs) and dust acoustic waves (DAWs) in self-gravitating dusty plasmas and collisional dusty plasmas by incorporating multiple species such as electrons, positive/negative ions, etc. Effects that arise in multicomponent dusty plasma due to negative ions are also discussed. The results obtained in this study are applicable in various space environments, such as cometary plasmas, astrophysical situations, planetary rings and interstellar medium.
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