Article
Engineering, Mechanical
Ryo Sakakibara, Ichiro Yoshida, Sho Nagai, Yuki Kondo, Kenichi Yamashita
Summary: The study introduces a newly developed algorithm to evaluate the running-in wear process of plateau surfaces, addressing the calculation problems and human judgment required in previous methods. This proposed method offers easy, precise, and direct evaluation of plateau surfaces and is expected to aid in determining optimal machining methods and conditions.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Multidisciplinary
Jiacheng Dai, Wenhan Zeng, Wenlong Lu, Jian Wang, Mingguang Shan, Xiangqian Jiang
Summary: This paper proposes an improved level-set-based algorithm for groove feature extraction and conducts experiments to validate its performance. The results show that the method is robust and improves both segmentation accuracy and computational speed.
Article
Engineering, Mechanical
Giacomo Maculotti, Edoardo Goti, Gianfranco Genta, Luigi Mazza, Maurizio Galetto
Summary: Precise wear evaluation is essential for developing prediction models and optimizing manufacturing processes. Conventional wear testing methods are not accurate enough, while surface topography-based methods can improve characterization reliability.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Forestry
Marina Matos, Ana M. Carta, Paula C. Pinto, Dmitry V. Evtuguin
Summary: Common trends in tissue paper manufacturing include replacing softwood pulp with hardwood pulp, such as bleached eucalyptus kraft pulp (BEKP), to improve softness. However, the use of a single type of hardwood fiber results in lower wet and dry strengths. To address this, additives like low molecular weight polyethylene glycol (PEG) and wet strength resins (such as PAE and GPAM resins) are combined to improve properties. Incorporating PEG and wet strength resins, especially PAE resin, results in significant improvements in wet and dry tensile strength without affecting water absorption and softness.
Article
Engineering, Multidisciplinary
Haijun Wang, Diqiu He, Yunxin Wu, Sheng Xu
Summary: The study conducted friction stir welding experiments on 2219 aluminum alloys with tools under different wear conditions, and found that tool wear affects the texture feature of the weld surface. An improved local binary pattern algorithm was proposed for feature extraction from weld surface images, which can capture subtle local feature changes. Euclidean distance similarity was used to evaluate the weld surface image, showing a good correlation with the wear state of the tool.
Article
Chemistry, Physical
Przemyslaw Podulka, Wojciech Macek, Ricardo Branco, Reza Masoudi Nejad
Summary: Characterization of surface topography is valuable for the validation of the tribological performance of machined parts. The precise definition of S-L surface is important for the accuracy of the manufacturing process. Commercial software methods can be helpful in defining the S-L surface precisely.
Article
Optics
Qiuying Li, Hua Yang, Yan Wang, Yichang Shou, Shuoqing Liu, Hailu Luo
Summary: This study proposes an optical method for surface topography detection of low-contrast phase objects, which achieves spatial differential operation by constructing reflected light paths. The method is demonstrated to be universal and accurate, and applicable to both opaque and transparent pure phase objects.
Article
Materials Science, Paper & Wood
Jasna Malesic, Marjan Marinsek, Irena Kralj Cigic
Summary: The widely used deacidification process based on MgO particles, Bookkeeper, was evaluated on two sets of nonvaluable historical paper samples. The results showed that the effectiveness of Bookkeeper deacidification treatment in extending the lifetime of paper samples was highly limited for most of the samples. There was no correlation between the alkaline reserve content or the pH of the deacidified paper samples and the degradation rate constants, but the degradation rate correlated with the pH of the paper samples before deacidification treatment. SEM EDS analysis revealed that Mg-rich particles remained on the paper surface after treatment.
Article
Engineering, Manufacturing
Guoqiang Fu, Yue Zheng, Sipei Zhu, Caijiang Lu, Xi Wang, Tao Wang
Summary: This paper explores the influence of tool posture on surface texture topography in five-axis milling and proposes evaluation indexes considering this influence. The ranges of tool posture angles corresponding to different characteristic surface texture topographies are obtained through classification. This research provides guidance for singularity avoidance in path planning and machining error compensation in five-axis milling.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Chemistry, Multidisciplinary
Ching-Bin Lin, Han-Sen Chang, Yulin Zhang, Fuqian Yang, Sanboh Lee
Summary: The study uses superhydrophobic nanoparticles in back-surface coating of cellulose-based papers to control water droplet spreading, finding that the size of nanoparticles affects the spreading of water droplets. This method can adjust the wettability of papers, providing a new approach.
Article
Materials Science, Multidisciplinary
Yuting Zhou, Yasi Wang, Pei Zeng, Zhiqiang Ji, Qingyu Wang, Fu Fan, Huimin Shi, Yiqin Chen
Summary: This study proposes a novel approach for fast and accurate evaluation of polished diamond surfaces by combining image processing and mathematical statistics. The surface topography quality (STQ) mathematical model is introduced, and a concept called surface topography quality rate (STQR) is generated to quantitatively evaluate the surface quality of diamond. The results demonstrate the reliability and advantages of this mathematical model in dealing with large-area surfaces compared to the conventional use of atomic force microscope.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Chemistry, Physical
Chengyuan Yao, Wanfu Shen, Xiaodong Hu, Chunguang Hu
Summary: By designing a processing scheme and using angle-resolved ellipsometry, the surface and subsurface quality of YAG crystals can be evaluated simultaneously, revealing the diminishing feature of subsurface damage and the atomic-level topography evolution of the polished planes.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Santiago Arango-Santander, Lina Serna, Juliana Sanchez-Garzon, John Franco
Summary: The study evaluated the adhesion of Streptococcus mutans to biomimetically-modified stainless steel surfaces using different surface topographies. The results indicated that some surface models showed a reduction in bacterial adhesion, while others showed an increase, highlighting the importance of careful selection of surface models for bacterial adhesion.
Article
Geochemistry & Geophysics
Haojing Chi, Kai Yan, Kai Yang, Shuyuan Du, Hanliang Li, Jianbo Qi, Wei Zhou
Summary: This letter discusses the importance of timely and accurate assessment of changes in mountain vegetation biomass and other parameters for mountain ecosystem conservation. The study evaluates different topographic correction models (TCMs) on hyperspectral images to provide insights for selecting the optimal TCMs.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Materials Science, Ceramics
Xin Chen, Yingdong Liang, Zhengyu Sun, Yu Zhao, Zhelun Ma, Liaoyuan Chen, Tianbiao Yu, Ji Zhao
Summary: The study investigated the grinding performance of TiC-Steel cermet using a customized vitrified bond cBN wheel. Results showed that the main removal modes of TiC-Steel cermet are plastic removal of steel phase and brittle fracture of ceramic phase. Surface roughness parameters increase with grinding depths and decrease with spindle rotation speed, with feed rate having less impact on surface quality. Optimal processing parameters were determined to achieve the best surface quality and lowest grinding force.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Paper & Wood
Mohit Sharma, Roberto Aguado, Dina Murtinho, Artur J. M. Valente, Paulo J. T. Ferreira
Summary: This study investigates the potential of highly substituted cationic starch for paper coating and its combination with tri-block polymers, Pluronics, in improving printing quality. The results show that the inclusion of cationic starch (ether/ester) and P123 in the formulation can enhance the printing quality.
Article
Materials Science, Multidisciplinary
Luis Alves, Ana Ramos, Maria G. Rasteiro, Carla Vitorino, Eduardo Ferraz, Paulo J. T. Ferreira, Maria L. Puertas, Jose A. F. Gamelas
Summary: Cellulose nanofibrils (CNFs) are promising nanomaterials for food packaging and printed electronics, offering environmentally friendly and cost-effective alternatives to petroleum-based polymers. By combining CNFs with other materials, such as clay minerals, composite materials with superior mechanical properties can be produced using either solvent casting or filtration + hot pressing methods, with the latter showing shorter production times and comparable gas barrier properties to net CNF films.
Article
Biochemistry & Molecular Biology
Jorge F. S. Pedrosa, Maria G. Rasteiro, Carlos P. Neto, Paulo J. T. Ferreira
Summary: This study evaluated the effects of cationization method and degree of substitution on the properties of cationic cellulose materials. Two-step cationization resulted in significant cellulose degradation and solubilization, while direct cationization produced longer fibers and a more cohesive gel-like material.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Chemistry, Multidisciplinary
Fatima Pinto, Ana Filipa Lourenco, Jorge F. S. Pedrosa, Lidia Goncalves, Celia Ventura, Nadia Vital, Ana Bettencourt, Susete N. Fernandes, Rafaela R. da Rosa, Maria Helena Godinho, Henriqueta Louro, Paulo J. T. Ferreira, Maria Joao Silva
Summary: Cellulose micro/nanomaterials (CMNM) are promising bio-nanomaterials with natural and renewable source, attractive properties, and potential for industrial and economical applications. This study evaluated the cell internalization and in vitro cytotoxicity and genotoxicity of CMNM compared to multi-walled carbon nanotubes (MWCNT). The results showed that CMNM did not induce cytotoxic effects, while MWCNT did. In terms of genotoxicity, some components of CMNM also exhibited significant genotoxicity.
Article
Polymer Science
Jorge F. S. Pedrosa, Luis Alves, Carlos P. Neto, Maria G. Rasteiro, Paulo J. T. Ferreira
Summary: Cationic cellulose derivatives synthesized through cationization treatment of pulp showed potential as bio-based retention agents in papermaking formulations, as evidenced by their flocculation performance and capability to improve filler retention.
Article
Chemistry, Multidisciplinary
Mohit Sharma, Roberto Aguado, Dina Murtinho, Artur J. M. Valente, Paulo J. T. Ferreira
Summary: This study explores the use of micro-/nanofibrillated celluloses (M/NFCs) on the paper surface to enhance printing quality. Different pre-treatment methods were used to produce M/NFCs, and various components were added to the coating formulations. The presence of M/NFCs and increased cationic charge density improved the printing quality, while the addition of other components showed varying effects on paper whiteness and color properties.
Article
Chemistry, Multidisciplinary
Andre Mazega, Quim Tarres, Roberto Aguado, Maria Angels Pelach, Pere Mutje, Paulo J. T. Ferreira, Marc Delgado-Aguilar
Summary: This study proposes a greener solution for enhancing paper's resistance to moisture, grease, and air by using nanocellulose, minerals, PVA, and other materials. The multi-purpose coatings are effective for food packaging applications, although not suitable for direct food contact.
Article
Materials Science, Multidisciplinary
A. S. Santos, E. S. Zamani, A. P. M. Sousa, P. C. O. R. Pinto, P. J. T. Ferreira, T. Maloney
Summary: This study aims to investigate the structure and performance of an air-laid sheet made of defibrated Eucalyptus pulp and polylactic acid (PLA) fibers. Different methodologies were used to prepare Eucalyptus pulp dry fibers, resulting in fibers with distinct morphological properties. Sheets with a grammage of 100 g m(-2) were prepared using a specially designed air-laid former, and their structural, mechanical, and water sorption properties were characterized. The results showed that sheets made from Eucalyptus fibers with fewer fines and fiber deformations had better absorbency, while those with more fines had higher strength. Sheets with 30% PLA fiber content exhibited the best combination of strength, absorption capacity, and stretch at break. The presence of PLA had a strong interaction with the fines in the sheet, affecting its consolidation and performance.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Chemistry, Applied
Ana F. Lourenco, Daniela Martins, Fernando Dourado, Pedro Sarmento, Paulo J. T. Ferreira, Jose A. F. Gamelas
Summary: This study found that mechanically treated bacterial nanocellulose (BNC) can improve the mechanical, optical, and structural properties of paper without affecting filler retention. However, the improvement in paper strength was only slight. Additionally, coating the paper surface with BNC can significantly enhance printing quality.
CARBOHYDRATE POLYMERS
(2023)
Article
Materials Science, Paper & Wood
Luis Alves, Ana Ramos, Eduardo Ferraz, Paulo J. T. Ferreira, Maria G. Rasteiro, Jose A. F. Gamelas
Summary: This study investigates the use of cellulose nanofibers (CNFs) in the production of composite films. Pure CNF films exhibit good mechanical and barrier properties, while the addition of minerals leads to a loss of these properties. Composite films made with TEMPO-oxidized or cationized CNFs show good mechanical, thermal, and barrier properties. Decreasing the pH of the suspensions reduces film preparation time without significantly impacting the properties of the composite films.
Article
Biochemistry & Molecular Biology
Jose Luis Sanchez-Salvador, Maria Graca Rasteiro, Ana Balea, Mohit Sharma, Jorge F. S. Pedrosa, Carlos Negro, M. Concepcion Monte, Angeles Blanco, Paulo J. T. Ferreira
Summary: This study investigates the effect of CMNF dispersion on paper reinforcement, showing its correlation with the rheology of the CMNF/starch mixing process. The results reveal that the optimal dispersion degree varies for different nanocellulose types and that the lowest viscosity of the coating formulation achieves the best mechanical properties.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Review
Polymer Science
Solange Magalhaes, Catarina Fernandes, Jorge F. S. Pedrosa, Luis Alves, Bruno Medronho, Paulo J. T. Ferreira, Maria da Graca Rasteiro
Summary: Cellulose, the most abundant renewable polymer on Earth, can be obtained from various sources. Traditional fractionation methods involve harsh chemicals, but new sustainable processes have been developed. Cellulose and its derivatives have wide applications, particularly in textiles and packaging, as eco-friendly alternatives to synthetic materials. This review discusses cellulose's properties, green extraction methods, chemical modification, and applications of cellulose derivatives.
Article
Biotechnology & Applied Microbiology
Celia Ventura, Fatima Pinto, Ana Filipa Lourenco, Jorge F. S. Pedrosa, Susete N. Fernandes, Rafaela R. da Rosa, Maria Helena Godinho, Paulo J. T. Ferreira, Henriqueta Louro, Maria Joao Silva
Summary: Cellulose micro/nanomaterials (CMNMs) are innovative materials with broad industrial and biomedical applications. This study evaluated the genotoxicity of two types of cellulose micro/nanofibrils (CMF and CNF) and cellulose nanocrystals (CNC), and found that CNC and CNF did not exhibit genotoxicity under the tested conditions, while CMF displayed a low genotoxic potential.
BIOENGINEERING-BASEL
(2023)
Meeting Abstract
Environmental Sciences
Fatima Pinto, Celia Ventura, Joao Cadete, Ana Filipa Lourenco, Jorge F. S. Pedrosa, Nadia Vital, Joana F. S. Pereira, Paulo Matos, Lidia Goncalves, Catarina C. Silva, Susete N. Fernandes, Rafaela R. da Rosa, Maria Helena Godinho, Ana Bettencourt, Luis Vieira, Peter Jordan, Paulo J. T. Ferreira, Henriqueta Louro, Maria Joao Silva
ENVIRONMENTAL AND MOLECULAR MUTAGENESIS
(2022)
Article
Toxicology
Celia Ventura, Catarina Marques, Joao Cadete, Madalena Vilar, Jorge F. S. Pedrosa, Fatima Pinto, Susete Nogueira Fernandes, Rafaela Raupp da Rosa, Maria Helena Godinho, Paulo J. T. Ferreira, Henriqueta Louro, Maria Joao Silva
Summary: This study aimed to assess the potential toxic and genotoxic effects of different nanocelluloses in mammalian cell lines. The results demonstrated that all nanocelluloses exhibited cytotoxicity and genotoxicity, which might be attributed to their physicochemical differences, cell uptake, and DNA damage response of the cell model.
JOURNAL OF XENOBIOTICS
(2022)
