Article
Polymer Science
Sergey Vyazovkin
Summary: The Jeziorny method replaces temperature values with corresponding time values in the isothermal Avrami plot to analyze nonisothermal crystallization data. However, this method is not applicable for nonisothermal data, as the intercept and slope of the plot cannot be interpreted as rate constant and Avrami exponent, respectively.
Article
Materials Science, Characterization & Testing
J. Martin-de Leon, V Bernardo, E. Solorzano, M. A. Rodriguez-Perez
Summary: The study investigates the crystallization kinetics of PLA under different CO2 pressures using a custom-designed pressure vessel. This new approach allows for spatial resolution, enabling detailed analysis of crystallization mechanisms. Unexpected peak in absorbance curve suggests physical phenomena during CO2 uptake and PLA crystallization.
Article
Green & Sustainable Science & Technology
O. V. Komova, V. I. Simagina, V. R. Butenko, G. V. Odegova, O. A. Bulavchenko, O. A. Nikolaeva, A. M. Ozerova, I. L. Lipatnikova, E. S. Tayban, S. A. Mukha, O. V. Netskina
Summary: The particle size and shape of bulk ammonia borane (NH3BH3) have received little attention in the literature. The published results on the influence of hydride dispersity on its dehydrogenation are limited and contradictory. This study presents new findings on the solid-state dehydrogenation of NH3BH3 at low temperatures. Samples with different particle characteristics, obtained by recrystallization using different procedures, were compared based on thermal analysis data and hydrogen evolution experiments. The results showed that the finely dispersed sample with a particle size of < 40μm exhibited the highest reactivity. A filamentous NH3BH3 with an ordered structure was synthesized and found to have relatively high reactivity. These findings highlight the need for further investigations on bulk ammonia borane with different particle types.
Article
Polymer Science
Wang-Kai Xiang, Qing Xie, Shan-Shan Xu, Chen-Xuan Sun, Cheng-Tao Yu, Ying Zheng, Peng-Ju Pan
Summary: Stereocomplex crystallization is an effective method to improve the physical properties of stereoregular polymers. This study investigates the effects of PDLA fraction and crystallization temperature on the crystallization kinetics and polymorphic crystalline structure using asymmetric blends of PLLA and PDLA. The results show that a high PDLA fraction and low temperature favor the crystallization of beta-form homocrystals.
CHINESE JOURNAL OF POLYMER SCIENCE
(2022)
Article
Materials Science, Ceramics
Suman Pawaria, Jyoti Ahlawat, Preeti Sharma, Sajjan Dahiya, Anil Ohlan, R. Punia, A. S. Maan
Summary: The glass transition and crystallization kinetics of lithium-modified zinc borate glasses with different compositions were studied using differential scanning calorimetry. The glass composition of 20ZnO·10Li2O·70B2O3 showed the highest thermal stability and glass-forming tendency among all other compositions. The activation energies for crystallization and glass transition were determined and found to be in close agreement with each other. The formation of a pure monoclinic LiZnBO3 crystalline phase was observed in certain compositions, which has potential for electric double-layer capacitance fabrication.
CERAMICS INTERNATIONAL
(2023)
Article
Polymer Science
Yongxuan Chen, Kefeng Xie, Yucheng He, Wenbing Hu
Summary: The study reports the isothermal crystallization kinetics of poly(glycolic acid) (PGA) and compares it to poly((L)-lactic acid) (PLLA). It was found that PGA generally crystallizes more quickly than PLLA, which is attributed to the smaller hydrogen side group of PGA and the differences in molecular mobility and packing between the two polymers.
Article
Polymer Science
Zhenqi Zhu, Zelin Yu, Yujing Bian, Xun Zhang, Ruonan Zeng, Bin Yang
Summary: Poly(lactic acid) (PLA) is a polymer with homogeneous polymorphism, and its different crystal forms exhibit distinct spectral features. The structure and crystallization behavior of PLA are crucial for understanding its properties. In this study, we used terahertz (THz) spectroscopy to investigate PLA films obtained under different crystallization conditions. We determined the relative contents of different crystal forms in PLA and studied the kinetics of polymer crystallization. The results demonstrate that THz spectroscopy is an effective method for characterizing polymer crystallization and studying its kinetics.
Article
Thermodynamics
Pratim Kumar Patra, Aanchal Jaisingh, Vishal Goel, Gurpreet Singh Kapur, Leena Nebhani
Summary: This paper investigates the isothermal and non-isothermal crystallization behavior of polypropylene and its blends, showing that PEI can promote the crystallization of PP when blended with reactive co-agent PP-g-MA. The Avrami equation confirms three-dimensional crystal growth in all samples, while Jeziorny-Avrami and Mo theories suggest enhanced crystallization rate in the compatibilized blend of PP/1PP-g-MA/1PEI.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Chemistry, Multidisciplinary
Evangelia Tarani, Klementina Pusnik Cresnar, Lidija Fras Zemljic, Konstantinos Chrissafis, George Z. Papageorgiou, Dimitra Lambropoulou, Alexandra Zamboulis, Dimitrios N. Bikiaris, Zoi Terzopoulou
Summary: Featured Application PLA nanocomposites are explored as antimicrobial bio-nanocomposites for food packaging or biomedical applications. Metal oxide nanofillers affect the thermal stability of PLA and act as heterogeneous nucleating agents, accelerating the crystallization process and reducing activation energy.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Yao Xie, Somia Yassin Hussain Abdalkarim, Ze Ji, Zhiming Chen, Mingxin Wang, Hou-Yong Yu
Summary: This study investigates the effect of different-sized nanocelluloses (NCs) on the crystallization kinetics and crystallographic morphology of a poly(l-lactic acid)/poly(d-lactic acid) (l/d) matrix. The researchers found evidence of the relationship between hydrogen bonding interactions and stereocomplex crystallization (SC) formation of nanocomposite-based NCs. They evaluated the synergistic effect of various aspect ratios of NCs as nucleating agents and observed improved properties in terms of crystallization ability, heat resistance, and barrier properties of the nanocomposites. The study offers a suitable strategy for selecting appropriate types of NCs as nucleating agents for designing high-performance materials for the food packaging industry.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Thermodynamics
Kourtidou Dimitra, Chrissafis Konstantinos
Summary: The study applied various modifications of the JMAEK equation to analyze the nonisothermal crystallization data of PEF/2.5 CNTs nanocomposite, showing that the multivariate nonlinear regression method can better explain the kinetic parameters of cold crystallization.
THERMOCHIMICA ACTA
(2021)
Article
Biochemistry & Molecular Biology
Wei-Wei Chang, Jinye Niu, Hui Peng, Weifeng Rong
Summary: In this study, selective formation of stereocomplex (sc) crystallization and suppression of homocrystallization (hc) in high-molecular-weight (HMW) PLLA/PDLA blends were achieved by adding C70 as a nucleator. Fourier-transformed infrared spectroscopy analysis revealed improved intermolecular interactions and inhibited molecular chain diffusion and mobility, leading to accelerated sc crystallization. The addition of C70 also resulted in a higher thermal stability compared to the neat PLLA/PDLA blend.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Polymer Science
Hao Zhang, Dawei Luo, Weijun Zhen
Summary: The study synthesized fulvic acid-g-poly(isoprene) grafting polymer as a modifier for poly(lactic acid), showing improved mechanical properties and thermal stability in the composite materials.
Article
Materials Science, Ceramics
Abhiram Senapati, Suvendu Kumar Barik, Pradyumna Kumar Parida, Hrudananda Jena
Summary: Sodium niobium phosphate (SNP) glasses with different compositions were prepared and their non-isothermal kinetics of glass transition and crystallization were studied. The activation energy of glass transition was deduced from the dependence of glass transition temperature on the heating rate. The average activation energies of crystallization were calculated by different kinetic methods. The nucleation and growth of various crystalline phases formed on heat treatment were investigated through Avrami exponents and SEM analysis.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Ceramics
S. S. Danewalia, K. Singh, S. K. Arya
Summary: The study investigates the structural and thermal properties as well as non-isothermal crystallization kinetics of glasses B2O3-Li2O-ZnO-V2O5, with ZnO systematically replaced by V2O5. The results show that V2O5 increases bulk crystallization and acts as a modifier in the glasses. These findings can aid in designing glasses, specifying their operating temperature ranges, and potential applications in photonics and electronics.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Physical
Debasish Barman, Parameswar Krishnan Iyer
Summary: This study presents a series of donor-alkyl bridge-acceptor luminogens as anti-Kasha emissive molecular rotors with mechanistic insights. The origin of aggregation-induced emission and coexistence of dual fluorescence and phosphorescence are realized by suppressing Kasha's rule. Furthermore, the large energy gaps between specific states and the abundance of smaller gaps facilitate reverse intersystem crossing, resulting in thermally activated delayed fluorescence and room-temperature phosphorescence.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Analytical
Xi Chen, Sameer Hussain, Xiaoyi Chen, Yi Hao, Pei Zhang, Ruixia Gao
Summary: Development of smart strategies for monitoring environmental contaminants and disease biomarkers has become a research hotspot concerning environmental protection and human health issues. Herein, we present facile fabrication of conjugated polymer based fluorescent hybrid micelles (PF-Plu-Mic) as an unprecedented super -quenching probe for selective detection of pollutants 4-nitroaniline (4-NA) and 2,6-dichloro-4-nitroaniline (DCNA) in natural water samples at ppb levels. Finally, an assay for hepatobiliary biomarker gamma-glutamyltransferase (GGT) is developed using L-glutamic acid gamma-(4-nitroanilide) as enzyme substrate and PF-Plu-Mic as a superior sensing material.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Multidisciplinary
Ansar Abbas, Chen Zhang, Sameer Hussain, Yang Li, Ruixia Gao, Jing Li, Xueyi Liu, Minghui Zhang, Silong Xu
Summary: Controlling the stability of oil-in-water emulsions is a key focus for scientists studying colloidal systems. Carbon dots have gained significant interest as smart materials due to their exceptional physicochemical properties and versatile applications. This study presents advanced and switchable O/W emulsions stabilized by the combined effect of the cationic surfactant CTAB and similarly charged CDs. The formulated emulsion shows universal stabilizing effects for a range of oil phases and can be switched between stable and unstable modes by adding anionic surfactant SDBS, with potential applications in water purification, pharmaceuticals, protein recognition, and catalysis.
Review
Chemistry, Inorganic & Nuclear
Muhammad Imran Anwar, Muhammad Asad, Limin Ma, Wenhua Zhang, Ansar Abbas, Mohammad Yasir Khan, Mohd Zeeshan, Asma Khatoon, Ruixia Gao, Sumaira Manzoor, Muhammad Naeem Ashiq, Sameer Hussain, M. Shahid, Guang Yang
Summary: Metal-organic frameworks (MOFs), especially nitrogenous MOFs, have attracted significant attention as promising electrode materials for supercapacitors due to their unique properties. However, there is a lack of critical reviews focusing on the application of nitrogenous MOFs and their derivatives and composites in supercapacitors.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Physics, Applied
Paromita Bhattacharjee, Himakshi Mishra, Parameswar K. K. Iyer, Harshal B. B. Nemade
Summary: This study demonstrates and analyzes the acoustically improving charge transport characteristics of a regioregular poly(3-hexylthiophene) (rrP3HT) based organic field effect transistor (OFET) fabricated on a YZ lithium niobate piezoelectric substrate. The acoustoelectric (AE) effect leads to a reduction in the effective energy gap between charge hopping states, resulting in a decrease in charge trapping, an increase in path conductivity, and the number of paths for charge transport. The presence of a surface acoustic wave (SAW) significantly increases the drain current and mobility, and reduces the gate voltage. The bias stress analysis confirms that the propagation of SAW enhances the long-term stability of the OFETs by compensating for the charge trapping effect.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Ramesh Babu Yathirajula, Ritesh Kant Gupta, Mohammad Adil Afroz, Anwesha Choudhury, Parameswar Krishnan Iyer
Summary: Charge balance can be achieved through energy level alignment and reduced barrier in transport layers. In this study, four hole transporting layers (HTLs) were used to regulate hole injection in the emissive layer. The NPD-based perovskite LED device demonstrated the best performance due to the well-matched HOMO and efficient charge transport. The device exhibited pure green emission and superior stability.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Environmental Sciences
Xiaoyi Chen, Sameer Hussain, Yuhai Tang, Xi Chen, Sijie Zhang, Yue Wang, Pei Zhang, Ruixia Gao, Sicen Wang, Yi Hao
Summary: The continuous emergence of PFOA and PFOS, persistent organic pollutants, in water bodies worldwide poses a serious threat to the global ecosystem. To effectively monitor and treat these toxicants, a ratiometric fluorescent probe called PF-DBT-Im was developed. This polymer demonstrates low detection limits and undergoes aggregation upon binding with PFOA/PFOS, allowing for easy visualization. Additionally, a smartphone-integrated device and a magnetic adsorbent, Fe3O4@NH2&F13, were utilized for rapid and efficient detection and removal of PFOA/PFOS from environmental water.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Materials Science, Multidisciplinary
Sameer Hussain, Xi Chen, Yingying Gao, Huijia Song, Xuemeng Tian, Yulian He, Ansar Abbas, Mohammad Adil Afroz, Yi Hao, Ruixia Gao
Summary: An efficient strategy is presented to suppress and transform the quenching process of pi-extended conjugated polymers (CPs) and enhance their photoluminescence quantum yield (PLQY) through the preparation of CP/Pluronic F-127 hybrid micelles. The hybrid micellar systems show improved PLQY and enhanced sensing responses towards pollutants, demonstrating their potential applications in biomedicine and solid-state optoelectronics.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Mayur Jagdishbhai Patel, Himangshu Baishya, Sushant Sharma, Nehal Zehra, Maimur Hossain, Ramkrishna Das Adhikari, Parameswar Krishnan Iyer
Summary: In order to enhance the performance of hybrid organic inorganic perovskite solar cells (HOIP-SCs), it is important to minimize intrinsic defect states and improve film quality. Incorporating an imidazolium containing cationic conjugated poly electrolyte (CPE), PFBT-MI, effectively passivated the ionic defects in the perovskite structure, resulting in improved film morphology and charge transport. The 1% doped perovskite device achieved the highest power conversion efficiency (PCE) of 19.23% compared to the pristine device, and the bromide ion counterion reduced hysteresis and improved long-term stability.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Paromita Bhattacharjee, Himakshi Mishra, Parameswar Krishnan Iyer, Harshal Bhalchandra Nemade
Summary: For the first time, an organic semiconductor, regioregular poly(3-hexylthiophene) (rrP3HT), based excitonic transistor on a piezoelectric YZ lithium niobate substrate is reported. The surface acoustic wave (SAW) field ionizes the excitons, storing the charge pair in the SAW modulated potential field in the semiconductor and carrying them forward. Long-range transport up to 4.7 mm at room temperature has been demonstrated. Exciton flux can be electrically controlled using SAW propagating through a dual metal-insulator-semiconductor (MIS) structure. The device's working mechanism has been verified through numerical analysis using MATLAB and its potential use as an all optical device has been electrically confirmed with additional electrode terminals at the output end.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Editorial Material
Chemistry, Multidisciplinary
Rabindranath Garai, Ritesh Kant Gupta, Parameswar Krishnan Iyer
ACCOUNTS OF MATERIALS RESEARCH
(2023)
Article
Chemistry, Physical
Ansar Abbas, Chen Zhang, Sameer Hussain, Yuhai Tang, Yang Li, Ruixia Gao, Silong Xu
Summary: In this study, a facile method for the fabrication of a wax-free oil-in-water release agent was presented. By optimizing the physical parameters and chemical properties, the newly formulated release agent showed excellent results on iron mould surfaces during on-site trials, indicating its promising potential in the construction industry.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Materials Science, Multidisciplinary
Ramesh Babu Yathirajula, Ritesh Kant Gupta, Mohammad Adil Afroz, Anwesha Choudhury, Himangshu Baishya, Parameswar Krishnan Iyer
Summary: The study presents a simple method for fabricating green perovskite light-emitting diodes (PeLEDs) with improved charge balance. The dual hole-transport layers (HTLs) used in the devices result in higher radiative recombination in the emissive layer (EML), leading to enhanced brightness and current efficiency. The achievement is attributed to the well-matched energy levels and reduced charge injection barrier.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Yue Wang, Wenchang Zhao, Ruixia Gao, Jake A. Heinlein, Lisa D. Pfefferle, Sameer Hussain, Junjie Zhang, Xingyan Wang, Jingang An
Summary: This work presents a highly promising adsorbent, magnetic montmorillonite (MMT) nanomaterials, which possess large surface area and excellent magnetism. A facile and green synthesis method is developed for preparing magnetic MMT nanocomposites (Fe3O4-Cu2+/MMT) without using hazardous solvents. The nanocomposites exhibit excellent magnetism, high adsorption capacity, and selectivity towards bovine hemoglobin, making them practical for analysis of real biological samples.
Article
Chemistry, Analytical
Arvin Sain Tanwar, Mst Nasima Khatun, Moirangthem Anita Chanu, Tapashi Sarmah, Yeon-Ho Im, Parameswar Krishnan Iyer
Summary: In this study, a highly fluorescent water-soluble conjugated polyelectrolyte PPMI was synthesized and applied as a fluorescence sensor for monitoring traces of carcinogenic Cr(vi) ions in water. PPMI exhibited a rapid, selective, and sensitive turn-off fluorescence signal in response to Cr(vi) through static quenching mechanism.
