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Improving oxidation stability of 2D MXenes: synthesis, storage media, and conditions
IQBAL AAMIR,Hong Junpyo,고태윤,구종민 나노기술연구협의회 2021 Nano Convergence Vol.8 No.9
Understanding and preventing oxidative degradation of MXene suspensions is essential for fostering fundamental academic studies and facilitating widespread industrial applications. Owing to their outstanding electrical, electrochemical, optoelectronic, and mechanical properties, MXenes, an emerging class of two-dimensional (2D) nanomaterials, show promising state-of-the-art performances in various applications including electromagnetic interference (EMI) shielding, terahertz shielding, electrochemical energy storage, triboelectric nanogenerators, thermal heaters, light-emitting diodes (LEDs), optoelectronics, and sensors. However, MXene synthesis using harsh chemical etching causes many defects or vacancies on the surface of the synthesized MXene flakes. Defective sites are vulnerable to oxidative degradation reactions with water and/or oxygen, which deteriorate the intrinsic properties of MXenes. In this review, we demonstrate the nature of oxidative degradation of MXenes and highlight the recent advancements in controlling the oxidation kinetics of MXenes with several promising strategic approaches, including careful control of the quality of the parent MAX phase, chemical etching conditions, defect passivation, dispersion medium, storage conditions, and polymer composites.
Shahzad, Faisal,Iqbal, Aamir,Zaidi, Shabi Abbas,Hwang, Suk-Won,Koo, Chong Min Elsevier 2019 Journal of industrial and engineering chemistry Vol.79 No.-
<P><B>Abstract</B></P> <P>Herein, we demonstrate the selective sensing of Dopamine (DA), an important neurotransmitter, by using Nafion-stabilized two-dimensional transition metal carbides (Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> MXenes). Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> was deposited on a glassy carbon electrode followed by Nafion coating to achieve a robust sensitivity (∼3nM), good selectivity, wide detection window (0.015–10μM), high stability, reproducibility, and outstanding recoveries for DA detection in real samples. MXene-based biosensor exhibited much better electrochemical performance when compared with reduced graphene oxide-based biosensor under similar experimental conditions due to the MXenes good electrical conductivity and negatively charged surface which assisted in the selective and sensitive detection of DA.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Faisal Shahzad,Aamir Iqbal,샤비,황석원,구종민 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
Herein, we demonstrate the selective sensing of Dopamine (DA), an important neurotransmitter, by usingNafion-stabilized two-dimensional transition metal carbides (Ti3C2TxMXenes). Ti3C2Tx was deposited ona glassy carbon electrode followed by Nafion coating to achieve a robust sensitivity ( 3 nM), goodselectivity, wide detection window (0.015–10 mM), high stability, reproducibility, and outstandingrecoveries for DA detection in real samples. MXene-based biosensor exhibited much betterelectrochemical performance when compared with reduced graphene oxide-based biosensor undersimilar experimental conditions due to the MXenes good electrical conductivity and negatively chargedsurface which assisted in the selective and sensitive detection of DA.
Characterization and Comparative Evaluation of Milk Protein Variants from Pakistani Dairy Breeds
Iqra Yasmin,Rabia Iqbal,Atif Liaqat,Wahab Ali Khan,Muhamad Nadeem,Aamir Iqbal,Muhammad Farhan Jahangir Chughtai,Syed Junaid Ur Rehman,Saima Tehseen,Tariq Mehmood,Samreen Ahsan,Saira Tanweer,Saima Naz 한국축산식품학회 2020 한국축산식품학회지 Vol.40 No.5
The aim of study was to scrutinize the physicochemical and protein profile of milk obtained from local Pakistani breeds of milch animals such as Nilli-Ravi buffalo, Sahiwal cow, Kajli sheep, Beetal goat and Brela camel. Physicochemical analysis unveiled maximum number of total solids and protein found in sheep and minimum in camel. Buffalo milk contains the highest level of fat (7.45%) while camel milk contains minimum (1.94%). Ash was found maximum in buffalo (0.81%) and sheep (0.80%) while minimum in cow’s milk (0.71%). Casein and whey proteins were separated by subjecting milk to isoelectric pH and then analyzed through sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE). The results showed heterogeneity among these species. Different fractions including αS1, αS2, κ-casein, β-casein and β-lactoglobulen (β-Lg) were identified and quantitatively compared in all milk samples. Additionally, this electrophoretic method after examining the number and strength of different protein bands (αS1, αS2, β- CN, α-LAC, BSA, and β-Lg, etc.), was helpful to understand the properties of milk for different processing purposes and could be successfully applied in dairy industry. Results revealed that camel milk was best suitable for producing allergen free milk protein products. Furthermore, based on the variability of milk proteins, it is suggested to clarify the phylogenetic relationships between different cattle breeds and to gather the necessary data to preserve the genetic fund and biodiversity of the local breeds. Thus, the study of milk protein from different breed and species has a wide range of scope in producing diverse protein based dairy products like cheese.