Article
Mathematics, Interdisciplinary Applications
Lingling Zhang, Lin Ke, Yanyan Guo, Xin Zhang, Qing Wang
Summary: This paper investigates the propagations of odd and even Laguerre-Gaussian beams in nematic liquid crystal and finds that only the (0, 0) mode of Laguerre-Gaussian beams can form a soliton. The other modes will evolve into unbounded states with scattered remnants of energy, while some high order modes can form chaoticons, which are localized well with little scattering and can propagate over long distances. Unlike solitons, chaoticons are not sensitive to the power and can still form within a certain deviation range. These results have potential applications in controlling the propagation of unstable beams and are valuable for chaotic synchronization and chaotic secure communication.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Chemistry, Multidisciplinary
Antal Jakli
Summary: This paper briefly summarises odd-even effects in liquid crystals based on the position and type of repeating units, discussing their impact on phase transitions, entropy, and secondary properties. The theoretical considerations behind these observed effects are also explored.
Article
Chemistry, Multidisciplinary
Mateusz Pawlak, Maciej Baginski, Pablo Llombart, Dominik Beutel, Guillermo Gonzalez-Rubio, Ewa Gorecka, Carsten Rockstuhl, Jozef Mieczkowski, Damian Pociecha, Wiktor Lewandowski
Summary: This study discovered helical nanofilaments formed by liquid crystalline (LC) dimers depending on the parity of the alkyl linker, and investigated their formation mechanism through molecular dynamics simulations. The study also found that the assembly structure of gold nanoparticles doped into the LC matrix can be tuned by controlling the pitch of the helices. Furthermore, the impact of the assembly structure on the chiral optical properties of composites was investigated.
CHEMICAL COMMUNICATIONS
(2022)
Editorial Material
Physics, Multidisciplinary
Heather M. Hill
Summary: The heavy-fermion crystal combines the properties of systems with inversion symmetry and those that break it.
Article
Chemistry, Physical
Joanna Los, Aleksandra Drozd-Rzoska, Sylwester J. Rzoska, Szymon Starzonek, Krzysztof Czuprnski, Prabir Mukherjee
Summary: The Landau-de Gennes mean-field model predicts a discontinuous transition in the isotropic-nematic phase transition, characterized by uniaxial ordering and a quadrupolar order parameter in three dimensions. This study investigates the pressure-related dielectric properties of rod-like nematogenic pentylcyanobiphenyl (5CB) and its nano-colloids with BaTiO3 nanoparticles. The dielectric constant scan reveals a near-continuous I-N phase transition in the compressed nanocolloid with a small amount of nanoparticles (x = 0.1%). The nematic phase in 5CB and its x = 1% nanocolloid exhibit high dielectric constants and bending-type, long-range pretransitional behavior.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Rebecca Walker, Magdalena Majewska, Damian Pociecha, Anna Makal, John M. D. Storey, Ewa Gorecka, Corrie T. Imrie
Summary: A series of pyrene-based liquid crystal dimers with different linking spacers have been prepared and exhibited various phase behaviors, including a novel twist-bend nematic phase.
Article
Chemistry, Multidisciplinary
Xinyue Yu, Suna Zhuang, Jianfeng Chen, Zhi-Yuan Li, Wenyao Liang
Summary: The transmission properties of odd/even one-way modes and their reversible conversion in a double-channel waveguide were studied. It was found that the M4 mode supports dispersionless slow-light propagation and the other three modes have strong robustness against defects.
Article
Chemistry, Physical
E. Cruickshank, K. Anderson, J. M. D. Storey, C. T. Imrie, E. Gorecka, D. Pociecha, A. Makal, M. M. Majewska
Summary: This study reports the synthesis and characterization of a series of bent odd-membered mesogenic dimers. These materials exhibit a tendency to form helical structures and we report three chiral phases in a single homologous series for the first time.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Physical
Daniel Zaton, Alexia Karamoula, Grant J. Strachan, John M. D. Storey, Corrie T. Imrie, Alfonso Martinez-Felipe
Summary: UV light is applied to control the stability of twist-bend nematic phases and conventional nematic phases in new liquid crystalline nonsymmetric dimers. The dynamic and static dielectric responses of the dimers are measured at different temperatures, showing high dielectric values and anisotropy. Isothermal phase transitions are promoted by light-irradiation, and the dynamics and reversibility of these transitions can be controlled by varying the chemical structure of the dimers, temperature, and UV light dosage.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Multidisciplinary
Naila Tufaha, Calum J. Gibb, John M. D. Storey, Corrie T. Imrie
Summary: Cyanobiphenyl-based liquid crystal dimers CBnSSnCB, with a disulfide link in the spacer, exhibit nematic properties. Surprisingly, the dimer with even-membered spacer (CB7SS7CB) shows a twist-bend nematic phase. The odd number of carbon atoms in the alkyl fragments affects the molecular shape and leads to higher nematic-isotropic transition temperatures.
Article
Polymer Science
Irma Flores, Ricardo A. Perez-Camargo, Elena Gabirondo, Maria Rosaria Caputo, Guoming Liu, Dujin Wang, Haritz Sardon, Alejandro J. Muller
Summary: This study investigates the crystallization behavior and thermodynamic properties of a series of aliphatic polyethers with varying chain lengths. The results indicate that the crystalline structure and thermal behavior are influenced by the chain length and cooling rate from the melt.
Article
Chemistry, Multidisciplinary
H. T. Srinivasa, Lutfor Md Rahman
Summary: Calamitic molecules consisting of pentabromophenol tethered to cyanobiphenyl via a flexible alkyl chain were synthesized and characterized for their mesomorphic properties. New chemical structures differing in the length of the spacer (6a-f) were confirmed by spectroscopic analysis and elemental analysis. Compounds with six, eight, nine, and ten methylene units in the spacer exhibited nematic liquid crystalline phases at room temperature, while the other derivatives were soft solids. The mesomorphic behavior and thermal stability of all compounds were studied using optical microscopy, differential scanning calorimetry, and thermal gravimetric analysis.
Article
Chemistry, Physical
Yuki Arakawa, Kenta Komatsu, Takuma Shiba, Hideto Tsuji
Summary: This study synthesized a series of classic LC trimer homologs and reevaluated their elusive monotropic mesophases, revealing the novel heliconical NTB phase in achiral bent molecules. The alternating induction of Sm and NTB phases depending on n parity was only observed in LC trimer homologs, suggesting steric interactions play a crucial role in determining the mesophase behavior.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Crystallography
Alexander V. Emelyanenko, Sergey A. Shvetsov
Summary: The existence of discotic nematic phase is proven in a system of rod-like molecules with negative dielectric anisotropy through the methods of molecular-statistical physics. The discotic nematic state is observed instead of isotropic liquid under the influence of electric field and in the presence of nanoparticles impurity. Temperature-induced phase transitions between calamitic and discotic phases at a fixed value of electric field are described. The spatial distributions of orientational order parameters and the distance over which the liquid crystal configuration can propagate are obtained.
LIQUID CRYSTALS AND THEIR APPLICATION
(2023)
Article
Agronomy
Gandura Omar Abagandura, Navreet Kaur Mahal, Nagender Pal Butail, Jashanjeet Kaur Dhaliwal, Asmita Gautam, Arun Bawa, Peter Kovacs, Sandeep Kumar
Summary: Manure application can increase soil carbon and nitrogen pools compared to mineral fertilizer application, especially at higher rates.
ARCHIVES OF AGRONOMY AND SOIL SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Pratibha Tripathi, Rahul Uttam, Sandeep Kumar, Roman Dabrowski, Ravindra Dhar
Summary: This study examines the thermodynamic, dielectric, and electro-optical properties of a room temperature nematic liquid crystal mixed with surface-stabilized gold nanoparticles. The results show that the addition of nanoparticles decreases the transition temperature of the liquid crystal and enhances its dielectric anisotropy. The study also identifies a relaxation mode in the dielectric behavior, caused by the flip-flop motion of the nematic molecules.
Article
Telecommunications
Sandeep Kumar, Puspraj Singh Chauhan, Manpreet Kaur, Tarun Lata
Summary: This paper studies the effective capacity performance of a delay-sensitive communication system over a cascaded Rayleigh fading channel with arbitrary correlation. Closed-form mathematical expressions for the effective capacity are derived, and the effect of different fading parameters on the system's effective throughput is demonstrated.
WIRELESS PERSONAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Asmita Shah, Harish Singh, Pongthep Prajongtat, Manish Chandra Joshi, Supa Hannongbua, Nattaporn Chattham, Young-Ki Kim, Sandeep Kumar, Dharmendra Pratap Singh
Summary: Researchers have converted chestnut waste into reduced graphene oxide and nitrogen-doped reduced graphene oxide with pyridinic-N dominance. The synthesized catalyst exhibits excellent oxygen reduction reaction activity, surpassing that of the commercial Pt/C catalyst, and shows higher methanol tolerance.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
S. Vanishree Bhat, K. Swamynathan, V. A. Raghunathan, Sandeep Kumar
Summary: This report illustrates the importance of the oligo-ethyleneoxy side chain on the liquid crystallinity of steroidal mesogens. The ethyleneoxy benzoates of sterols exhibit cholesteric and polymorphic smectic mesophases, as well as frustrated phases such as TGB and blue phase. The mesogenic tendency of these molecules is analyzed based on the length of the ethyleneoxy side chain and the steroidal moiety, and their amphotropic behavior has been investigated using POM, DSC, SAXS, and SEM techniques.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Environmental Sciences
Namita Das, Himadri Rajput, Ashraf Aly Hassan, Sandeep Kumar
Summary: This study tested five widely employed coagulants for the treatment of complex oilfield-generated produced water. The results showed that ferric chloride was the most efficient coagulant, removing 74.25% of total solids, with a treatment cost of USD 4 per m(-3) of produced water.
Article
Nanoscience & Nanotechnology
Yogendra Nailwal, Matthew A. Addicoat, Manisha Gaurav, Santanu Kumar Pal
Summary: Covalent organic frameworks (COFs) are emerging smart materials that can be designed and synthesized for diverse applications by tuning their structural diversity and topology. This study presents a fast crystallization strategy in the hydrazone-based COF (Bth-Tp-COF) using a Schiff-base reaction between benzene-1,3,5-tricarbohydrazide and triformylphloroglucinol linkers. The synthesized Bth-Tp-COF exhibited high stability and when doped with palladium (Pd), it served as a highly efficient heterogeneous catalyst for the Suzuki-Miyaura cross-coupling reaction with rapid reaction time and excellent yields.
ACS APPLIED NANO MATERIALS
(2023)
Editorial Material
Pharmacology & Pharmacy
Ramesh Joga, Hitesh Kumar Behera, Chetan Dushant Sabanis, Simran Simran, Sandeep Kumar, Neeraj Kumar
Summary: Photoresponsive liposomes have the potential to become a non-invasive alternative to ELISA for detecting low levels of biomarkers. The US20210396744 patent application introduces novel liposomes that can detect target substances using light. However, ensuring stability and optimizing various parameters such as plasma stability and efficient loading of photosensitive components in the membrane will be crucial for the clinical success of this technology.
PHARMACEUTICAL PATENT ANALYST
(2023)
Article
Chemistry, Multidisciplinary
Vanishree S. Bhat, Marichandran Vadivel, Dharmendra Pratap Singh, V. A. Raghunathan, Arun Roy, Sandeep Kumar
Summary: In this study, a series of novel nitrogen and oxygen-incorporated chromenonaphthophenanthridine-based elliptical dimers were synthesized through tandem Pictet-Spengler cyclization followed by ipso-aromatic substitution in one-pot. Their mesophase characteristics were characterized by optical microscopy, differential scanning calorimetry, and X-ray diffraction studies. The photophysical properties were investigated using UV-vis and emission spectroscopy, and the charge transport properties were analyzed by time-of-flight measurements, with observed ambipolar mobilities of the order of 10(-3) cm(2) V-1 s(-1). These materials show promising potential for applications in organic electronics due to their high solubility, excellent thermal stability, self-organizing properties, and ambipolar charge transport characteristics.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Dimpal Janu, Sandeep Kumar, Kuldeep Singh
Summary: GCN-CSS is a novel Graph Convolution Network-based cooperative spectrum sensing methodology that adapts to the dynamic changes in the Cognitive Radio Network. The proposed model is proven to be superior in different dynamic scenarios of the wireless environment through sufficient simulations.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Khalid K. Almuzaini, Shalini Stalin, Sindhu P. Menon, Sandeep Kumar, Stephen Ojo, Prashant Kumar Shukla, Piyush Kumar Pareek, Piyush Kumar Shukla
Summary: In wireless sensor networks, the challenge lies in designing and managing the networks considering limited power, stringent bandwidth, dynamic topology, and high network density. The proposed IGRPSO protocol addresses these challenges by optimizing routing with minimal latency and a higher packet delivery ratio.
INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS
(2023)
Review
Pharmacology & Pharmacy
Saurabh Shah, Ramesh Joga, Tejaswini Kolipaka, Chetan Sabnis Dushyantrao, Pooja Khairnar, Vivek Phatale, Giriraj Pandey, Saurabh Srivastava, Sandeep Kumar
Summary: This article introduces the liquid crystalline phase, which has attracted global attention due to its intriguing properties. It enumerates the different classes of liquid crystals and focuses on lyotropic liquid crystals (LLCs), which exhibit their liquid crystalline nature based on the surrounding solvent media. The article discusses the advantages of LLCs in drug delivery and tissue regeneration, fabrication techniques, and applications in novel therapeutic avenues.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2023)
Article
Chemistry, Multidisciplinary
T. Aravinda, Srilatha Rao, A. S. Sowmyashree, Ashwathanarayana Gowda, L. Parashuram, Kayim Pineda Urbina, Gururaj Kudur Jayaprakash, Sandeep Kumar
Summary: In this study, a metal-free phthalocyanine-based discotic liquid crystal (PcDLC) was tested for its corrosion inhibitory capacity on mild steel (MS) samples in 1.0 M HCl medium using potentiodynamic and electrochemical impedance parameters. The PcDLC exhibited excellent corrosion inhibition with a maximum efficiency of 89.61%. The strong adsorption of PcDLC onto the MS surface was responsible for this superior ability. Scanning electron microscopy and FTIR confirmed the formation of a protective layer of inhibitors on the MS surface. Density function theory revealed a strong interaction between the inhibitor and surface iron atoms.
Article
Information Science & Library Science
Sandeep Kumar, Tirthankar Ghosal, Asif Ekbal
Summary: Peer reviews are crucial in scientific communication, providing evaluation of research papers by multiple experts. This study proposes an unsupervised deep neural network approach for generating meta-reviews. Using a generic template, the method fills in the template with generated meta-review text to ensure consistency. This approach is beneficial for decision-making and helps in writing more informative meta-reviews.
INTERNATIONAL JOURNAL ON DIGITAL LIBRARIES
(2023)
Article
Geriatrics & Gerontology
Sagar Vyavahare, Sandeep Kumar, Kathryn Smith, Bharati Mendhe, Roger Zhong, Marion A. Cooley, Babak Baban, Carlos M. Isales, Mark Hamrick, William Hill, Sadanand Fulzele
Summary: Emerging evidence suggests that microRNA-141-3p plays a role in age-related pathologies. In this study, we inhibited miR-141-3p expression in aged mice and observed improved immune, bone, and muscle health. Treatment with Anti-miR-141-3p resulted in decreased pro-inflammatory cytokines, a shift from pro-inflammatory to anti-inflammatory immune cell populations, and improved bone microstructure and muscle fiber size. Molecular analysis revealed the role of miR-141-3p in regulating senescence and inflammation, as well as its potential crosstalk with FOXO-1 transcription factor. These findings suggest that inhibiting miR-141-3p may be a potential strategy for promoting healthy aging.
