Article
Materials Science, Multidisciplinary
Marija Djosic, Ana Jankovic, Milena Stevanovic, Jovica Stojanovic, Maja Vukasinovic-Sekulic, Vesna Kojic, Vesna Miskovic-Stankovic
Summary: Electrophoretic deposition (EPD) technique was used to fabricate composite coatings for orthopedic implants. Hydroxyapatite (HAP), poly(vinyl alcohol) (PVA) and chitosan (CS) coatings, with or without gentamicin (Gent) antibiotic, were deposited in a single-step process. The composite coatings displayed similar composition to natural bone tissue and exhibited antibacterial properties due to the presence of gentamicin. The coatings showed good biocompatibility and promoted the growth of new HAP layer.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Yanni Zhou, Yadong Chai, Mari Miyata, Motohiro Tagaya
Summary: We have developed a biomimetic process to achieve effective calcium phosphate particle precipitation on poly(vinyl alcohol) films. By controlling the exposure of carboxylate ions and esterification reaction in the films, Ca2+-carboxylate ion interactions were formed, leading to successful precipitation of calcium phosphate on the films. This technology has the potential to control the density and size of the precipitated particles and can be applied on polymeric films.
Article
Polymer Science
Seong Baek Yang, Mohammad Rezaul Karim, Jungeon Lee, Jeong Hyun Yeum, Sabina Yeasmin
Summary: Novel poly(vinyl alcohol)/poly(vinyl butyral-vinyl alcohol) films with improved hydrophobicity were prepared by saponification of poly(vinyl acetate)/poly(vinyl butyral) blend films. The saponification process was confirmed by various analysis techniques. The hydrophobicity of the films increased with increasing poly(vinyl butyral) content. The saponified films exhibited improved mechanical properties and unique surface characteristics. These films have potential applications in biomaterials, filters, and medical devices.
Article
Multidisciplinary Sciences
C. Huebner, M. Vadala, K. Voges, D. C. Lupascu
Summary: Freeze-casting is a versatile technique that involves freezing a liquid suspension, sublimating the solidified state to gas state, and sintering the remaining scaffold to consolidate and densify the structure. It is commonly used with water as the pore forming agent and has been developed for near net shape forming of dense ceramics. In this study, we synthesized porous composite materials using the ice templating method, with poly(vinyl alcohol) as the matrix and nano-silica, nanoclay, and microfibrillated cellulose as fillers to enhance mechanical stability.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Multidisciplinary
V. Collins Arun Prakash, I. Venda, V. Thamizharasi, E. Sathya
Summary: In this study, spherical hydroxyapatite powder was successfully synthesized using the microemulsion method, with poly vinyl alcohol playing a key role in the process. The analysis results indicate that the prepared hydroxyapatite powders have high purity, small crystallite size, and uniform morphology, making them an ideal candidate for biomedical applications.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Yingxu Song, Sumei Zhang, Jian Kang, Jinyao Chen, Ya Cao
Summary: Annealing PVA films at different temperatures affects the water absorption, leading to changes in the formation of PVA-iodine complexes. The amount of PVA segments with moderate hydration has a significant impact on the complexation process.
Article
Polymer Science
Hamid Reza Hedayati, Manounchehr Khorasani, Mostafa Ahmadi, Nicholas Ballard
Summary: In this study, well-defined and linear PVAc was synthesized using RAFT polymerization method, overcoming the difficulties in controlling molecular weight distribution during the hydrolysis of PVAc. This offers a potential route to the production of PVAc and PVA products with uniform properties.
Review
Polymer Science
Nadia Guajardo
Summary: Lipases are versatile enzymes that can catalyze various hydrolysis and synthesis reactions with selectivity. Immobilization techniques, such as using polyvinyl alcohol (PVA) as a support material, can recover and stabilize the enzymes for their application in different types of bioreactors. This review analyzes the potential of PVA in immobilizing lipases by combining it with alginate, chitosan, and hydroxypropylmethylcellulose (HPMC), resulting in the formation of magnetic fibers and microspheres. The review includes 42 articles published between 1999 and 2023, selected from the Scopus database. Expanding knowledge in this area is crucial due to the versatility and scalability of PVA as a support material for lipase immobilization in various bioreactor configurations.
Article
Polymer Science
Alessandro Angelini, Anja Car, Ionel Adrian Dinu, Luigi Leva, Wilfredo Yave
Summary: Tailor-made poly(vinyl alcohol)-b-poly(styrene) copolymers (PVA-b-PS) for separation membranes are synthesized using reversible-deactivation radical polymerization techniques. These di-block copolymers have high molecular weight (>70 kDa), high PVA content (>80 wt%), and good film-forming property. They self-assemble in aqueous media to form micelles, which when cast on a porous substrate, result in thin-film membranes with higher water permeance than that of PVA homopolymer. The PS nanodomains within the PVA matrix act as cross-linking points, eliminating the need for chemical cross-linkers and acid catalysts. Thermal annealing further enhances membrane selectivity through improved microphase separation.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Yajun Ren, Xiaofeng Song, Youhua Chen, Wen Xin, Chuanming Zhu, Yuan Huang, Na Tian, Yuling Huang
Summary: Self-healable polymers are promising intelligent materials that can repair physical damage autonomously, extending their lifetime and reducing maintenance costs. In this study, a series of polymers with switching phase and healing accelerator properties were synthesized and blended with poly(vinyl alcohol). The resulting blend demonstrated good self-healing behavior and hydrothermal-response shape memory effect.
Article
Engineering, Chemical
Yifan Xia, Sinu C. Rajappan, Dmytro Serhiichuk, Mikkel Rykaer Kraglund, Jens Oluf Jensen, David Aili
Summary: A series of poly(vinyl alcohol-co-vinyl acetal) gel electrolytes were prepared and assessed for their performance as electrode separators in alkaline water electrolysis. The membrane properties could be tuned by varying the degree of functionalization, and a membrane with moderate vinyl acetal content showed good mechanical robustness and ion conductivity. The membrane effectively prevented hydrogen crossover during alkaline water electrolysis tests. The strategies presented in this work have general relevance to the field for the development of new ion-solvating membrane systems.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Polymer Science
Riza Asmaa Saari, Ryota Maeno, Warinda Marujiwat, Muhammad Shahrulnizam Nasri, Kazuaki Matsumura, Masayuki Yamaguchi
Summary: The addition of lithium bromide significantly enhances the mechanical properties of PVA fibers by reducing crystallinity and hydrogen bonding between PVA chains. Lithium bromide is removed from the fibers during spinning, while maintaining strong hydrogen bonding within the fibers.
Article
Polymer Science
Ja-Rok Kim, Sung-Ho Woo, You-Lim Son, Jae-Ryong Kim, Rajeswari M. Kasi, Seong-Cheol Kim
Summary: A new three-step strategy has been developed to increase both the mechanical strength and swelling ratio of hydrogels. By cross-linking PAAm with PVA, obtaining a dual network through acid treatment and drying, and converting cross-linked PAAm into polyelectrolyte in the dual network, the hydrogel achieves excellent mechanical properties and remarkable swelling, allowing for anisotropic swelling through simple stretching.
Article
Engineering, Biomedical
Lin Shi, Jiongrun Chen, Ye Tian, Li Ren
Summary: This article presents a new method to improve the mineralization of PVA hydrogels and successfully fabricate PVA hydrogels with continuously graded hydroxyapatite coating. The modified hydrogels show excellent mineralization ability and can tightly integrate with subchondral bone, making them promising substitutes for articular cartilage.
JOURNAL OF BIOMATERIALS APPLICATIONS
(2022)
Article
Polymer Science
Lujuan Li, Xiaodong Xu, Lei Liu, Pingan Song, Qianqian Cao, Zhiguang Xu, Zhengping Fang, Hao Wang
Summary: The presence of water significantly reduces the mechanical strength of PVA but increases its plasticity. Additionally, water inclusion lowers the glass transition temperature of PVA, increases free volume, and promotes relaxation and mobility of PVA chains. This is mainly due to the plasticizing and lubricating effects of water on the PVA chains.
Article
Physics, Condensed Matter
A. Jbeli, N. Zeiri, N. Yahyaoui, P. Baser, M. Said
Summary: The electronic and optical properties of CdSe/ZnSe semiconductor core/shell quantum dots with hydrogenic donor impurity were investigated theoretically. The perturbation and variational methods were used to calculate the binding energy, photoionization cross-section, polarizability, and diamagnetic susceptibility of the excited impurity under various conditions. A significant stark shift in the binding energy was observed under the influence of an external electric field.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Rahat Batool, Tariq Mahmood, Sajid Mahmood, Abdul Aziz Bhatti
Summary: This study investigates the effects of alkali metal doping (Na, K, Cs) on MAPbI3 through compositional engineering. The results show that doping Na, K, and Cs can improve the phase stability, thermodynamic stability, and optical absorption of MAPbI3.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
N. A. N. M. Nor, M. A. H. Razali, W. H. A. W. K. Annuar, N. N. Alam, F. N. Sazman, N. H. M. Zaki, A. S. Kamisan, A. I. Kamisan, M. H. Samat, A. M. M. Ali, O. H. Hassan, B. U. Haq, M. Z. A. Yahya, M. F. M. Taib
Summary: This study investigates the potential of quaternary chalcogenides semiconductors as thin film solar cell absorbers using density functional theory (DFT) and density functional theory plus Hubbard U (DFT + U) approach. The results show that by applying Hubbard U terms, the electronic band gaps can be accurately predicted, providing valuable insights for finding cost-effective new thin film solar cell materials.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Ashwani Kumar, Anuj Kumar, Mohaseen S. Tamboli, Mohd Ubaidullah, J. Jayarubi, S. K. Tripathi
Summary: In this study, lead-based perovskite solar cells are replaced by bismuth-based perovskite cells to overcome their instability and toxicity. CsBi3I10 perovskite films are fabricated using a modified drop-casting process, and the effects of post-annealing temperature on the morphological, structural, and optical properties are investigated. The photovoltaic performance of the cells without a hole transport layer is also quantitatively evaluated.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Yang Gao, Shu-Ming Chen, Shuo Cao, Shang-Zhou Zhang, Philippe Djemia, Qing-Miao Hu
Summary: This study investigates the phase stability, elastic modulus, and hardness of ternary nitride Ti1-xAlxN. It is found that the hardness increases with the Al content x. The cubic B1 structure is more stable for x < about 0.75, while the hexagonal structure (B4) is more stable for x > about 0.75. The composition dependent hardness and phase decomposition contribute to the convex shaped hardness curve of Ti1-xAlxN.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Fengqi Wang, Qinyan Ye, Xulin He, Kun Luo, Xiaolong Ran, Xingping Zheng, Cheng Liao, Ru Li
Summary: This report uses rigorous calculations based on density functional theory to study the piezoelectric and elastic properties of wurtzite aluminum nitride (w-AlN) with single- and co-alloying by Hf (or Zr) and Sc. The research finds that the (HfSc)0.375Al0.625N and (ZrSc)0.375Al0.625N with stable wurtzite phase have a large piezoelectric coefficient d33 of 49.18 pC/N and 47.00 pC/N, respectively. However, the piezoelectric voltage constant g33 and electromechanical coupling constant k233 of HfAlN, ZrAlN, HfScAlN, and ZrScAlN are smaller than that of ScAlN, which is attributed to the large dielectric constant epsilon 33 of Hf (or Zr) alloying samples. Furthermore, the calculations of internal parameter u and bond angle alpha elucidate the brittle-to-ductile transformation in alloying w-AlN crystal structure. Electronic structure calculations show that the bandgap decreases almost linearly with the increase of alloying concentration, and the Hf (or Zr) alloying compounds become n-type semiconductors due to the existing high-charge states.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
S. R. Athul, K. Arun, S. Swathi, U. D. Remya, Andrea Dzubinska, Marian Reiffers, Nagalakshmi Ramamoorthi
Summary: The magnetic and magnetocaloric characteristics of Ho6FeSb2 have been studied. The compound exhibits two second-order ferromagnetic transitions, enabling hysteresis-free magnetocaloric effect across a wide temperature range. The alloy has high relative cooling power and magnetoresistance, making it suitable for hysteresis-free magnetocaloric applications.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Reena Sharma, Neelam Hooda, Ashima Hooda, Satish Khasa
Summary: A polycrystalline double perovskite La2CoMnO6 sample was prepared and its structural, dielectric and magnetic properties were investigated. The sample exhibited complex structures and magnetic behavior, and showed good conductivity and dielectric performance. Its multi-domain magnetic structure suggests its suitability for memory device applications.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Shubha Dubey, Jisha A. Abraham, Kumud Dubey, Vineet Sahu, Anchit Modi, G. Pagare, N. K. Gaur
Summary: This study investigates the optoelectronic, thermodynamic, thermoelectric, and mechanical stability properties of RhTiP Half Heusler semiconductors. The results show that RhTiP is a non-magnetic material with confirmed mechanical stability. It is found to be an indirect-bandgap semiconductor with a good Seebeck coefficient. This study suggests that RhTiP has promising applications in the thermoelectric and optoelectronic fields.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Xun Xie, Jiong-Ju Hao, Hong-Wei Yang
Summary: This work presents a multilayer film structure that uses optical resonance to prepare highly efficient and saturated red, green, and blue transmittance colors. Numerical simulations and analysis show that the structure can produce R, G, and B colors with a purity comparable to standard RGB colors, while maintaining efficient transmission efficiency and obtaining a rich variety of structural colors. Additionally, a metallic interlayer is introduced to selectively suppress resonances in the short-wavelength region, improving the purity of the red color. The study also investigates the effect of the incidence angle on color purity and transmission efficiency.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Yueqiang Zhao
Summary: Solubility property is of great interest in chemical, physical, pharmaceutical, material, and environmental sciences. Understanding the intrinsic reason behind solubility behavior is a fascinating task. The theoretical relation between binary mutual solubility and liquid-liquid interfacial tension has been derived, where the partitioning of solute molecules between two coexisting liquid phases is determined by the transfer free energy per unit segment for a chain-like solute molecule expressed in terms of solute-solvent interfacial tension. This general theory of solubility is in good agreement with experimental results for binary mutual solubility and molar transfer free energy of solute molecules.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Osama K. M. Bashiar, R. E. Kroon, H. C. Swart, R. A. Harris
Summary: ZnO thin films with near-infrared emission were successfully fabricated using pulsed laser deposition under vacuum conditions, without the need for additional gases or implantation methods. The NIR emission was hypothesized to be caused by defects in the ZnO film due to high energy particle impacts on the sample surface.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
O. Stognei, A. Berezutskii, I. Anisimov, A. Deryabin
Summary: The influence of ZrOn matrix stoichiometry on the electrical and magnetoresistive properties of Fe-Zr-O nanocomposites has been studied. It was found that the magnetoresistive effect is not observed in composites with oxygen lack, while composites with oxygen excess show magnetoresistive effect and increased resistivity. Magnetoresistivity in composites with oxygen lack only appears after heat treatment. These results can be explained by the difference in the density of localized states in the oxide matrix of the composites and the ratio between two types of conductivity.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Mehmet Bayirli, Aykut Ilgaz, Orhan Zeybek
Summary: The present study aims to understand the relationship between impedance characteristics and fractal behaviors. By producing neat and carbon nanotube doped composite specimens, the researchers investigated the electrical properties and surface heteromorphology using Nyquist plots and fractal analysis.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
M. I. Khan, Saddam Hussain, Muhamad Saleem, Fatimah Mohammed Alzahrani, Muhammad Siddique, M. S. Hassan, Allah Ditta Khalid, Munawar Iqbal
Summary: The sol-gel method was used to deposit Ti-doped MAPbBr3 films on FTO-glass substrates with different doping ratios (0%, 4%, and 6%). XRD analysis confirmed the cubic structure of all films, and the 4% Ti-doped film exhibited a large grain size, low band gap energy, and high refractive index. Solar cells fabricated using the 4% Ti-doped MAPbBr3 film showed improved performance in terms of current density, open circuit voltage, fill factor, and efficiency.
PHYSICA B-CONDENSED MATTER
(2024)