Article
Multidisciplinary Sciences
Dan Cheng, Jun Zhang, Jianye Fu, Hao Song, Chengzhong Yu
Summary: This study presents a hierarchical spatial assembly strategy for fabricating silica-polymer composites and obtaining silica and carbon nanoparticles with unprecedented structures. Through a deeper understanding of the hierarchical spatial assembly mechanism, precise regulation of the structures of nanoparticles is achieved.
Article
Materials Science, Multidisciplinary
Xiao Li, Biao Guo, Jie Jian, Jinqing Ao, Qifeng Tang, Jiupeng Song, Yu Zhang
Summary: Selective surface densification (SSD) can significantly improve the mechanical properties of powder metallurgical (P/M) parts at low additional costs. This study proposes a new surface vibration extrusion process that enhances surface densification by facilitating dislocation motion and metal flow. The vibration-assisted extrusion results in a more thorough and uniform surface densification with lower extrusion load compared to direct extrusion. The high surface-densified layer achieved has a depth of up to 530 μm, slightly surpassing some commercial SSD parts, with approximately twice the surface hardness and superior friction and wear properties. Overall, surface vibration extrusion shows promise as a process for surface densification of P/M parts.
MATERIALS & DESIGN
(2022)
Article
Engineering, Chemical
Tsaone Gosiamemang, Jerry Y. Y. Heng
Summary: Sodium hydroxide (NaOH) plays an important role in the nucleation of silica nano-particles (SNPs), but little is known about the physicochemical properties and surface modification of the resulting SNPs. By treating SNPs with hydrochloric acid, the sodium ions can be removed and the thermal stability of SNPs can be significantly improved. The surface chemistry of SNPs can be easily modified with octyltrimethoxysilane and octadecyltrimethoxysilane, resulting in super-hydrophobicity and reduced moisture sorption.
Article
Chemistry, Physical
Menglu Li, Nianmin Hong, Jian Jiang, Wenxin Fu
Summary: This study investigated the preparation mechanism of monodispersed hollow silica nanoparticles (HSNs) using a template strategy. It was found that only positively charged polystyrene (PS) templates could induce the deposition of hydrolyzed silicon source and promote the growth of SiO2 shells through the condensation of silanol groups. This research provides detailed insights into the formation process and mechanism of HSNs.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Analytical
Xia Zhang, Jia Gao, Xinyue Wang, Sa Wang, Bo Jiang, Wei Wang, Hui Wang
Summary: In this study, a conventional bright-field imaging technique combined with a series of refractive index standard solutions was used to determine the local refractive index of single particles. The refractive index was found to be independent of particle size, surface roughness, and chemical composition. Additionally, the refractive index of homemade core-shell nanoparticles was accurately tuned by adjusting the ratio of core-to-shell geometry. This simple and effective strategy has extensive applications and potentials in the exploration, design, and optimization of composite photonic crystals, as well as in the fields of reflective displays, optical identification, and encryption.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Mohammadreza Kosari, Uzma Anjum, Shibo Xi, Alvin M. H. Lim, Abdul Majeed Seayad, Emmanuel A. J. Raj, Sergey M. Kozlov, Armando Borgna, Hua Chun Zeng
Summary: This study explores the impact of a novel maze-like nanoreactor framework (MVmSiO(2)) on CO2 hydrogenation, demonstrating enhanced CO2 activity, improved methanol yield, and prolonged stability. Beyond morphology optimization, the architectural design of the support also plays a significant role in improving reaction performance.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Biochemistry & Molecular Biology
Magdalena Laskowska, Agnieszka Karczmarska, Mateusz Schabikowski, Michal Adamek, Alexey Maximenko, Katarzyna Pawlik, Oliwia Kowalska, Zbigniew Olejniczak, Lukasz Laskowski
Summary: The effects of synthesis conditions on the size and structure of synthetic opals were investigated using the Stober process. The internal hierarchical structure of the resulting silica particles was confirmed, and the study showed no dependence on the concentration of reagents and the size of the particles. This research is significant for the synthesis and application of synthetic opals.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Pablo A. Mercada, Luis A. Perez, Eduardo A. Coronado
Summary: The study focused on determining the porosity degree of the m-SiO2 shell of GNRs@m-SiO2 at different concentrations of the porogenic surfactant CTAB by analyzing the extinction spectra features and using electrodynamics modeling. Changes in CTAB concentration affect both the porosity and thickness of the m-SiO2 shell.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Ceramics
Keitaro Yamaguchi, Shinobu Hashimoto
Summary: Conventional ceramic sintering cannot harden carbonates easily due to their thermal decomposition, but the cold sintering process (CSP) allows for lower temperature hardening. This study used vaterite phase calcium carbonate as the starting material and found that as the cold sintering temperature increased, the bulk density and compressive strength of the hardened calcium carbonate also increased, with the maximum compressive strength achieved at 80 degrees Celsius.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Ying Long, Bo Liu, Shiming Lin, Hua-Tay Lin
Summary: Submicron tungsten diboride (WB2) powder was successfully synthesized with different carbon sources and heat treatment temperatures, resulting in high-density sintered samples. The formation mechanism of the WB2 powders synthesized by boro/carbothermal reduction was verified through thermodynamic calculations.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Review
Materials Science, Multidisciplinary
Mohd Rhafiq Mazlan, Nashrah Hani Jamadon, Armin Rajabi, Abu Bakar Sulong, Intan Fadhlina Mohamed, Farazila Yusof, Nur Ayuni Jamal
Summary: The process of sintering involves applying pressure and heat to fuse particles together into a solid mass without melting them. Interparticles necking, or fusion between particles, is important for producing high-density and high-porosity products. Increasing necking size between particles leads to smaller pore sizes and stronger, harder materials. Proper process parameters are required to achieve larger necking growth. This article reviews the effect of powder and processing parameters and discusses different processes such as conventional sintering, microwave sintering, and selective laser melting.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
J. Matthew D. Lane, Jason P. Koski, Keith A. Jones, Tracy J. Vogler
Summary: The effect of initial temperature on the shock compression of porous silica was studied using molecular dynamics simulation. It was found that temperature had a significant influence on the response within a narrow pressure range, increasing the final shock density. However, this effect was negligible at lower and higher pressures. For vitreous silica, the effect of initial temperature was greatest in the compaction regime, where material strength played a significant role. Microstructure also influenced the behavior, with aerogel structures being more strongly impacted.
Article
Chemistry, Applied
Shiying Li, Huanhuan Yang, Sen Wang, Mei Dong, Jianguo Wang, Weibin Fan
Summary: Hierarchical macro/microporous ZSM-5 zeolite synthesized from silica spheres showed improved catalytic performance in methanol to olefins reaction due to enhanced diffusion, reduced coke deposition, and increased production of propene and butene through alkene cycle contribution.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Review
Engineering, Electrical & Electronic
Yuchen Li, Xuetong Zhao, Shenglin Kang, Yongjian Xiao, Chengjun Ren, Jing Guo, Xilin Wang
Summary: This review summarizes the processing features, densification mechanisms, and applications of cold sintering process (CSP) in advanced functional ceramic materials. CSP offers a new option for fabricating ceramics at low temperatures and enables the design of grain boundaries and development of new types of functional ceramics and ceramic-polymer composites.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Physics, Fluids & Plasmas
Phalguni Shah, Eleanor Ward, Srishti Arora, Michelle M. Driscoll
Summary: We present experimental results on the rupture of colloidal films with varying volume fractions. The films are formed using a constant fluid volume, ruptured manually or spontaneously, and the dynamics are recorded using high-speed imaging. Our findings reveal that even for high colloidal volume fractions, the rupture of colloidal films follows a behavior similar to Newtonian fluids. However, higher-viscosity films exhibit thicker regions away from the boundary at the time of rupture, which may be attributed to viscous stresses slowing down film thinning.
PHYSICAL REVIEW FLUIDS
(2023)
Article
Chemistry, Multidisciplinary
Kumar Varoon Agrawal, Berna Topuz, Tung Cao Thanh Pham, Thanh Huu Nguyen, Nicole Sauer, Neel Rangnekar, Han Zhang, Katabathini Narasimharao, Sulaiman Nasir Basahel, Lorraine F. Francis, Christopher W. Macosko, Shaeel Al-Thabaiti, Michael Tsapatsis, Kyung Byung Yoon
ADVANCED MATERIALS
(2015)
Article
Chemistry, Multidisciplinary
Neel Rangnekar, Meera Shete, Kumar Varoon Agrawal, Berna Topuz, Prashant Kumar, Qiang Guo, Issam Ismail, Abdulrahman Alyoubi, Sulaiman Basahel, Katabathini Narasimharao, Christopher W. Macosko, K. Andre Mkhoyan, Shaeel Al-Thabaiti, Benjamin Stottrup, Michael Tsapatsis
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2015)
Article
Chemistry, Multidisciplinary
Meera Shete, Manjesh Kumar, Donghun Kim, Neel Rangnekar, Dandan Xu, Berna Topuz, Kumar Varoon Agrawal, Evguenia Karapetrova, Benjamin Stottrup, Shaeel Al-Thabaiti, Sulaiman Basahel, Katabathini Narasimharao, Jeffrey D. Rimer, Michael Tsapatsis
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2017)
Article
Chemistry, Multidisciplinary
Han Zhang, Qiang Xiao, Xianghai Guo, Najun Li, Prashant Kumar, Neel Rangnekar, Mi Young Jeon, Shaeel Al-Thabaiti, Katabathini Narasimharao, Sulaiman Nasir Basahel, Berna Topuz, Frank J. Onorato, Christopher W. Macosko, K. Andre Mkhoyan, Michael Tsapatsis
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2016)
Article
Engineering, Multidisciplinary
Berna Topuz, Levent Yilmaz, Halil Kalipcilar
JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY
(2019)
Article
Chemistry, Applied
Fatma Sahin, Benia Topuz, Halil Kalipcilar
MICROPOROUS AND MESOPOROUS MATERIALS
(2018)
Article
Engineering, Chemical
Fatma Sahin, Berna Topuz, Halil Kalipcilar
JOURNAL OF MEMBRANE SCIENCE
(2020)
Article
Materials Science, Biomaterials
Aye Karakecili, Berna Topuz, Serdar Korpayev, Mert Erdek
MATERIALS SCIENCE AND ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
(2019)
Article
Materials Science, Biomaterials
Ozge Toprak, Berna Topuz, Yanad Abou Monsef, Cagdas Oto, Kaan Orhan, Ayse Karakecili
Summary: In this study, a MOF-embedded electrospun fiber scaffold for the controlled release of BMP-6 was developed for the first time, showing superior osteogenic effects with sustained release lasting up to 30 days. The results demonstrate the potential of utilizing MOF carriers in electrospun scaffolds for effective bone regeneration in tissue engineering applications.
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
(2021)
Article
Engineering, Chemical
Tugce Kurt, Berna Topuz
Summary: A novel Ti-incorporated methyl-linked silica mixed network membrane was successfully developed. Improvements in membrane thickness and type of support led to enhanced selectivity and permeance of the membrane.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
E. Simal Mirza, Berna Topuz
Summary: Tailored novel membrane networks with excellent hydrothermal stability are desired for gas sieving applications. Ti-incorporated BTESM organosilica membranes show high H-2 permeance and ideal selectivities for various gas pairs.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Berna Topuz, Hakan Kayi, Toygun Sahin, Feriha Sevval Ersoy, Ayse Gunyakti, Ayse Karakecili
Summary: Biomolecule carrier systems based on metal-organic frameworks (MOFs), such as UiO-66, have high potential as efficient carriers due to their structural tunability and high storage capacity. In this study, UiO-66 nanocrystals were synthesized at room temperature and used as a carrier for fosfomycin, without altering the crystal structure. Antibacterial activity studies showed that fosfomycin loaded UiO-66 nanocrystals exhibited concentration-dependent bactericidal and bacteriostatic activities against S. aureus and E. coli. Density functional theory investigations revealed the strong interaction between fosfomycin and UiO-66, indicating the potential of UiO-66 as a promising carrier for fosfomycin.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Materials Science, Biomaterials
Ayse Karakecili, Berna Topuz, Feriha Sevval Ersoy, Toygun Sahin, Ayse Gunyakti, Tugrul Tolga Demirtas
Summary: This study evaluated the double function of UiO-66 MOF structure as a carrier for fosfomycin antibiotic and as an osteogenic differentiation promoter in 3D chitosan scaffolds. The results showed that CHI/UiO-66/FOS scaffolds had a good fiber structure and mechanical strength, and exhibited bactericidal activity against Staphylococcus aureus. Additionally, the scaffolds were biocompatible to pre-osteoblast cells and facilitated gene expression and extracellular matrix mineralization.
BIOMATERIALS ADVANCES
(2022)
Article
Engineering, Chemical
Berna Topuz, Aylin Onder, Travis C. Bowen, Halil Kalipcilar
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2017)
