Review
Chemistry, Physical
S. A. Hassanzadeh-Tabrizi
Summary: Crystallite size has a significant impact on the properties of nanomaterials. Various methods, including X-Ray diffraction, Raman spectroscopy, and dark-field transmission electron microscopy, have been used to calculate crystallite size. The Scherrer method is widely used due to its simplicity and speed, but it does not provide information on crystallite size distribution. Raman spectroscopy provides relatively accurate results, but may have computational difficulties for other nanosystems. Dark-field TEM/HRTEM is an effective method that provides both crystallite size and distribution, but its results may not be representative of the entire sample. Combining these techniques can provide complementary results for in-depth analysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Condensed Matter
K. R. Desai, S. T. Alone, S. R. Wadgane, Sagar E. Shirsath, Khalid M. Batoo, A. Imran, E. H. Raslan, M. Hadi, M. F. Ijaz, R. H. Kadam
Summary: The properties of Mg-Mn co-substituted CdFe2O4 nanocrystalline particles were investigated, including strain mechanism, elastic properties, and cation distribution. The results were compared using Williamson-Hall analysis, Scherrer equation, and Rietveld refinement, with cation distribution estimated using the Bertuat method and elastic properties studied via infrared spectra. The obtained results were discussed in terms of strain mechanism, elastic constants, and the substitution of Mg-Mn ions in CdFe2O4.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Chemistry, Physical
E. Ozugurlu
Summary: The sol-gel method was used to prepare Zn1-xCdxO nanoparticles with various Cd concentrations, and the structural and optical properties were analyzed experimentally and theoretically. The study showed that the addition of Cd alters the crystal structure of ZnO and significantly affects the band-gap and optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
S. Mustapha, J. O. Tijani, M. M. Ndamitso, A. S. Abdulkareem, D. T. Shuaib, A. T. Amigun, H. L. Abubakar
Summary: This study synthesized TiO2 nanoparticles using a sol-gel method, examining the effects of stirring time and solution pH on morphology, phase types, and crystallite sizes. The results indicated that stirring time and solution pH significantly influenced the crystallite sizes, but not the phase types.
INTERNATIONAL NANO LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Anupama Bhankhar, Monika Saini, Swati Sehrawat, Rajni Shukla
Summary: Li(x)Ni(1-x)O (x = 0.01, 0.02, and 0.03) samples were synthesized via the sol-gel process. FTIR confirmed the formation of Li(x)Ni(1-x)O series. XRD analysis was used to determine crystallite properties. The impact of strain induced in Li(x)Ni(1-x)O was further analyzed using WH-UDM, SSP, and H-W models, and the morphology was analyzed by HRTEM.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Takumi Nishikubo, Takashi Imai, Yuki Sakai, Masaichiro Mizumaki, Shogo Kawaguchi, Norihiro Oshime, Ayumu Shimada, Kento Sugawara, Kenji Ohwada, Akihiko Machida, Tetsu Watanuki, Kosuke Kurushima, Shigeo Mori, Takashi Mizokawa, Masaki Azuma
Summary: Chemical substitution can tune the working temperature of phase-transition-type negative thermal expansion (NTE) materials and reduce volume shrinkage during the transition. By investigating electron doping and reduction of lone-pair activity in PbVO3, it is found that the combination of Bi and Sr substitutions enables a temperature-induced polar to non-polar transition with 11% volume shrinkage, the largest among reported NTE materials. The domain structure of coexisting cubic and tetragonal phases and its spatial distribution were successfully observed using advanced microscopy techniques.
CHEMISTRY OF MATERIALS
(2023)
Article
Physics, Condensed Matter
K. J. Putman, M. R. Rowles, N. A. Marks, I Suarez-Martinez
Summary: This computational study investigated the diffraction behavior of stacked layers of graphene and hexagonal boron nitride, revealing that single-layer graphene behaves as a 2D material while three or more layers stack diffraction as bulk material. By correlating crystallite size with diffraction peak parameters, strong affine relationships were observed for different structures. The study also presented a series of expressions for calculating crystallite size without size-dependence or shape assumptions, along with a detailed workflow for applying these expressions to experimental data.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Thermodynamics
Ali Imran, Muhammad Asif Zahoor Raja, Muhammad Shoaib, Muhammad Zeb, Kottakkaran Sooppy Nisar
Summary: A novel theoretical model is proposed for the electro osmotic flow of a Williamson fluid model in a micro ciliated channel, taking into account heat transfer phenomena. The Poisson-Boltzmann equation is solved analytically to obtain expressions for the axial velocity, pressure gradient, temperature, and stream functions using a perturbation technique, while the transverse velocity and pressure rise profile are investigated numerically using MATHEMATICA software. The effects of various parameters on velocity distribution, temperature, pressure gradient, and pressure rise per wavelength are presented graphically. Additionally, cilia are found to play an important role in ductus efferentes, sperm transportation, and various drug delivery mechanisms.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Md Sahadat Hossain, Monika Mahmud, Mashrafi Bin Mobarak, Sazia Sultana, Md Aftab Ali Shaikh, Samina Ahmed
Summary: Crystallite size is a crucial property of solid crystalline materials, and accurate estimation of crystallite size is highly beneficial for practical applications. This research introduces two new models for precise calculations of crystallite size and explores their applicability using synthetic and natural materials. The study finds that both models provide acceptable values for the crystallite size of different materials, and the size increases with temperature. The limitations of the straight line model in Scherrer method and Monshi-Scherrer equation are also discussed.
Article
Chemistry, Multidisciplinary
Mpho W. W. Maswanganye, Guy L. L. Kabongo, Mokhotjwa S. S. Dhlamini
Summary: Doping ZnS nanoparticles with Ti introduces strain into the crystal lattice, leading to lattice expansion and reduced crystallite sizes. Ti doping increases the energy band gap, reduces charge carrier recombination, and improves charge transfer mobility. The presence of Ti in ZnS nanoparticles decreases the charge transfer resistance.
Article
Physics, Condensed Matter
N. Manopradha, S. Gowri, S. Rama, K. Selvaraju, K. Kirubavathi
Summary: In this study, single crystals of P2CT were synthesized using standard method at room temperature, and various parameters such as crystal structure, solubility, stability, optical properties, hardness, and elasticity were investigated. X-ray diffraction, absorption spectra, and Vickers microhardness test were conducted to analyze the structural, optical, and mechanical characteristics of the grown crystal.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Chemistry, Multidisciplinary
Md Sahadat Hossain, Md Mahfujul Hasan, Monika Mahmud, Mashrafi Bin Mobarak, Samina Ahmed
Summary: This study successfully synthesized hydroxyapatite (Hap) without the need for high-temperature calcination by using UV-illumination instead. The evaluation of crystallographic parameters for the UV-synthesized Hap showed similar crystallite size and crystallinity to those obtained through high-temperature calcination. Additionally, the reliability of different models in assessing crystallite size was verified.
Article
Optics
N. Khlifi, N. Ihzaz, S. Mrabet, A. Alyamani, L. El Mir
Summary: This study reports the effects of Co doping on the structural and optical properties of ZnO oxide nanoparticles prepared by a solvothermal method. The results show that Co replaces Zn in the ZnO matrix, and the ZnO lattice parameters decrease with increasing Co content. The crystallite size and lattice strain were evaluated using various methods, and the changes in band gap were confirmed by optical studies.
JOURNAL OF LUMINESCENCE
(2022)
Article
Materials Science, Multidisciplinary
Hyesung Kim, Yue Wang, Nikita Denisov, Zhenni Wu, Stepan Kment, Patrik Schmuki
Summary: This work examines the photoelectrochemical response of TiO2 layers prepared by reactive DC sputter deposition on conductive glass. By optimizing the sputter parameters and using a thin Ti interlayer, high-efficiency TiO2 (anatase) photoanodes can be fabricated.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Ceramics
H. Nadimi, H. Sarpoolaky, M. Soltanieh
Summary: Nanocrystalline TiC with an average size of 20 nm was synthesized using LiCl?KCl, with elemental Ti and carbon black as starting materials. Increasing heating time improved sample purity and increased TiC crystallite size to 20 nm. The formation kinetics of synthesized TiC could be modeled using a shrinking core model.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
L. A. Martinez-Chavez, K. Esquivel, D. A. Solis-Casados, R. Velazquez-Castillo, E. Haro-Poniatowski, L. Escobar-Alarcon
Summary: A crossed beam pulsed laser deposition method was used to prepare nanocomposites Bi/TiO2 thin films on two different substrates. Bi nanostructures were successfully embedded in the TiO2 matrix by depositing Bi and TiO2 layers alternately. Various characterization techniques revealed controlled physical and chemical properties of the samples.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Luis Fernando Morelos-Medina, Rufino Nava-Mendoza, Carlos Martin Cortes-Romero, Rodrigo Rafael Velazquez-Castillo, J. Santos-Cruz, Maria de los Angeles Cuan-Hernandez
Summary: Solid solutions ZnxCd1-xS were synthesized using coprecipitation and sonochemistry methods, and the influence of the synthesis method on the morphology and electronic properties of the systems was investigated. X-ray diffraction confirmed the formation of a solid solution with hierarchical morphology, and the crystallite size was found to decrease with the incorporation of Zn in the crystal lattice. Other characterization techniques were also used to study the band edge emission and water splitting performance. The results suggest that the incorporation of Zn enhances the charge separation and defect generation in the catalyst structure, leading to improved hydrogen production.
JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
A. Rosales, V Gutierrez, Janet Ocampo-Hernandez, Martha L. Jimenez-Gonzalez, Iliana E. Medina-Ramirez, L. Ortiz-Frade, K. Esquivel
Summary: This study investigated the effects of different hydrophobic agents and pH modification on the SiO2-TiO2 composite. The results showed that the surface morphology and roughness of the coating were influenced by the hydrophobic agents. Changes in vibrational properties and self-cleaning properties were observed due to the addition of TiO2 nanoparticles. The photocatalytic activity was improved in specific coatings with the hydrophobic agent and nanoparticles. The pH also had an impact on the performance of the coatings.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Ricardo Pascual Alanis-Gomez, Eric Mauricio Rivera-Munoz, Gabriel Luna-Barcenas, Jose Rafael Alanis-Gomez, Rodrigo Velazquez-Castillo
Summary: In this study, hexagonal HAp nanofibers with preferential crystalline orientation were produced and mixed with chitosan to create composite materials. The morphology of the nanofibers exposed active chemical groups and ions on the surface, which interacted with chitosan to enhance the mechanical resistance of the composites. Additionally, mixing the nanofibers and chitosan using a sonotrode improved their dispersion within the matrix and prevented migration. The mechanical resistance of the composite materials was higher than that of similar materials made with commercial HAp powders.
Article
Chemistry, Multidisciplinary
Jacqueline Torres-Liminana, Ana A. Feregrino-Perez, Marina Vega-Gonzalez, Luis Escobar-Alarcon, Jose Antonio Cervantes-Chavez, Karen Esquivel
Summary: This study successfully synthesized silver-titanium dioxide (Ag-TiO2) materials using Eucalyptus globulus extract as a reductive agent. The materials exhibited excellent antimicrobial and photocatalytic properties, making them a green option for water disinfection.
Article
Materials Science, Multidisciplinary
E. Haro-Poniatowski, L. Escobar-Alarcon, J. L. Hernandez-Pozos, L. G. Mendoza-Luna, Cesar A. Guarin
Summary: This work presents a method for synthesizing selenium nanoparticles in various solvents through femtosecond pulsed laser ablation in liquids (FPLAL). The synthesized nanoparticles were characterized using TEM, UV-Vis, and Raman spectroscopy, revealing the impact of solvents on the size and morphology of the nanoparticles.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Karen M. Soto, Jose M. Lopez-Romero, Sandra Mendoza, C. Peza-Ledesma, E. M. Rivera-Munoz, Rodrigo Rafael Velazquez-Castillo, Jorge Pineda-Pinon, Nestor Mendez-Lozano, Alejandro Manzano-Ramirez
Summary: Mexico has a wide variety of medicinal plants, and the green synthesis of gold nanoparticles using these plants has gained attention due to its ease, cost-effectiveness, eco-friendly nature, and rapid synthesis. This article explores the antioxidant activity and ability to synthesize gold nanoparticles of aqueous and ethanolic extracts from marigold and Rosell flowers. The synthesized nanoparticles were characterized using various techniques, and the green nanoparticles showed smaller diameters and better stability compared to chemically synthesized ones.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Review
Engineering, Chemical
Jesus Roberto Vargas-Ortiz, Carmen Gonzalez, Karen Esquivel
Summary: This review discusses the role, physicochemical properties, potential applications, and toxicological effects of magnetic nanoparticles (MNPs) in complex biological systems. MNPs have been widely used in various industries, leading to increased interactions with biological organisms. However, the full impact of these particles on complex biological systems and the toxicology aspects of their biomedical applications remain unclear, with mixed and inconclusive results. A consolidative framework that considers the physicochemical properties and potential risks of MNPs is necessary for their future manageable applications.
Article
Plant Sciences
Noelia Ferrusquia-Jimenez, Beatriz Gonzalez-Arias, Alicia Rosales, Karen Esquivel, Eleazar M. Escamilla-Silva, Adrian E. Ortega-Torres, Ramon G. Guevara-Gonzalez
Summary: The co-application of SiO2-NPs and B.c-A improves chili pepper growth by enhancing seed germination, plant height, leaf number, fruit number and yield. Additionally, it increases CAT and PAL activities in chili pepper plants, indicating the induction of plant immunity by the bacteria-NP treatment.
Article
Plant Sciences
Luis Paramo, Ana Angelica Feregrino-Perez, Marina Vega-Gonzalez, Luis Escobar-Alarcon, Karen Esquivel
Summary: The present study investigated the stress induction of Medicago sativa L. crops irrigated with TiO2 and TiO2 doped with Ag, Fe, and Cu ions. The nanomaterial treatments caused a significant reduction in stem length, leaf size, and chlorophyll index, and an increase in total phenol content and DPPH inhibition percentage. However, the observed effects did not show a clear relationship between the type of nanomaterial, synthesis method, or concentration. The addition of microwaves in the synthesis method resulted in a higher content of phenols and inhibition percentage compared to traditional sol-gel synthesis.
Article
Chemistry, Multidisciplinary
Aldo Cordoba, Eric Mauricio Rivera-Munoz, Rodrigo Velazquez-Castillo, Karen Esquivel
Summary: The investigation focused on the synthesis of nanocomposite polymers reinforced with TiO2 and SiO2 nanoparticles at different concentrations. The interaction between the nanoparticles and the polymer matrix resulted in improved mechanical properties with low weight concentrations. The crystalline and morphological properties of the nanoparticles were characterized, and the molecular structure of the coatings was analyzed. The crosslinking efficiency, hydrophobicity, and adhesion of the nanocomposites were evaluated, and mechanical tests showed significant increases in hardness, elastic modulus, and tensile strength with increasing nanoparticle concentration while maintaining ductility.
Article
Plant Sciences
Axel E. Garcia-Ovando, Jose Emilio Ramirez Pina, Edgardo Ulises Esquivel Naranjo, Jose Antonio Cervantes Chavez, Karen Esquivel
Summary: Nanoscience and Nanotechnology have been widely applied in agriculture in the past decade. The synthesis of nanomaterials using bio sources has been explored to reduce environmental impact. The application of nanomaterials on crops allows the study of plant responses and their importance to human beings.
Article
Energy & Fuels
Edith Meneses-Ruiz, Jose Escobar, Rodolfo Juventino Mora, Jose Ascencion Montoya, Maria Concepcion Barrera, Dora Solis-Casados, Luis Escobar-Alarcon, Paz Del Angel, Georgina Laredo
Summary: Using highly crystalline MOF MIL-101(Cr) as an adsorbent for pretreatment of oil-derived middle distillates before hydrotreating, the process allows for a significant reduction in operating temperature and pressure, leading to improved efficiency in ULSD production.
OIL AND GAS SCIENCE AND TECHNOLOGY-REVUE D IFP ENERGIES NOUVELLES
(2021)