Article
Chemistry, Multidisciplinary
Qingqing Zhang, Wei Zhu, Jie Zhou, Yuan Deng
Summary: Quantitative thermal performance measurements and thermal management at the micro-/nano scale are important due to the shrinking size of electronic components. Scanning thermal microscopy (SThM) accurately reflects changes in local thermal signals based on a thermally sensitive probe. However, the unclear thermal resistance at the probe-sample interface limits the quantitative characterization of thermal conductivity for different materials. This paper analyzes the heat transfer process considering the thermal contact resistance and develops a mathematical function to describe the relationship between sample thermal conductivity and probe temperature.
Article
Chemistry, Multidisciplinary
Jose Manuel Sojo Gordillo, Gerard Gadea Diez, Merce Pacios Pujado, Marc Salleras, Denise Estrada-Wiese, Marc Dolcet, Luis Fonseca, Alex Morata, Albert Tarancon
Summary: This work demonstrates the use of scanning thermal microscopy for assessing the thermal conductivity of Si and SiGe nanowires, showing its significant utility in characterizing the thermal properties of integrated nanostructures.
Article
Nanoscience & Nanotechnology
You-Yong Wang, Xiang-Qian Wang, Yuan-Qing Li, Pei Huang, Bo Yang, Ning Hu, Shao-Yun Fu
Summary: The study introduces a simple and effective method to convert natural bamboo into bamboo steel, which has high specific tensile strength, superior mechanical properties, excellent thermal insulation capability, and high dimensional stability. This strategy using green and abundant natural bamboo as raw materials is highly attractive for the sustainable development of structural engineering materials.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
David Buckley, Zakhar R. Kudrynskyi, Nilanthy Balakrishnan, Tom Vincent, Debarati Mazumder, Eli Castanon, Zakhar D. Kovalyuk, Oleg Kolosov, Olga Kazakova, Alexander Tzalenchuk, Amalia Patane
Summary: The ability of materials to conduct heat is crucial for various physical phenomena, from thermal management to thermoelectrics. Two-dimensional materials like InSe offer a versatile platform to tailor heat transfer due to their high surface-to-volume ratio and mechanical flexibility. Studies show that 2D InSe exhibits anomalous low thermal conductivity compared to traditional dielectrics, making it a promising candidate for future technologies that require efficient heat dissipation or thermoelectric energy conversion.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Thermodynamics
Juhang Cha, Hwijong Shin, Ohmyoung Kwon
Summary: Through this study, we achieved a two-dimensional extension of NP SThM with almost a 20-fold improvement in measurement sensitivity under mild vacuum conditions. Vacuum point scanning thermal microscopy has been proven to be an essential tool in the analysis of nanoscale energy transport and conversion inside nanodevices and nanomaterials.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Sean H. Mills, Steven E. Zeltmann, Peter Ercius, Aaron A. Kohnert, Blas P. Uberuaga, Andrew M. Minor
Summary: Vacancies, which are missing atoms in crystalline materials, can occur at equilibrium or out of equilibrium and are difficult to measure or visualize experimentally. This study presents a method using high-resolution electron microscopy to map vacancy concentrations and their distribution. The method was demonstrated using a model Au thin film and applied to non-equilibrium defects in pure Al. The technique provides direct measurements of vacancy concentrations at the individual defect level in materials in and out of equilibrium.
Article
Multidisciplinary Sciences
Anuva Aishwarya, Arjun Raghavan, Sean Howard, Zhuozhen Cai, Gohil S. Thakur, Choongjae Won, Sang-Wook Cheong, Claudia Felser, Vidya Madhavan
Summary: Spin chains in solid state materials are important quantum systems with potential applications. This study used low-temperature scanning tunneling microscopy to reveal long-lifetime excitations in a specific material, providing new insights for increasing spin lifetimes and quantum applications.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Multidisciplinary
Amin Reihani, Yuxuan Luan, Shen Yan, Ju Won Lim, Edgar Meyhofer, Pramod Reddy
Summary: The quantitative mapping of temperature fields with nanometric resolution is crucial in various scientific research areas and emerging technologies. Recent advances in scanning thermal microscopy (SThM) have enabled simultaneous quantification of tip-sample thermal resistance and topography, allowing for quantitative thermometry even in situations where the temperature field is modulated. The introduction of a modulated heat input to the scanning thermal probe (STP) allows for the mapping of unmodulated temperature fields with high spatial and temperature resolution, facilitating temperature mapping of microdevices under practical operating conditions.
Article
Energy & Fuels
Xianfeng Yue, Rong Zhang, Xiaobei Jin, Xiaofeng Zhang, Gege Bao, Daochun Qin
Summary: This study uses bamboo-derived materials as the framework for phase change materials, which can reduce energy consumption and increase building energy efficiency. The hierarchical structure of the bamboo-based PCM provides ample space for loading paraffin and prevents leakage, while also having a higher thermal conductivity. The study demonstrates the promising potential of bamboo-based PCMs in building temperature regulation applications.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Construction & Building Technology
Amjad Khabaz
Summary: This study investigates the improvement of thermal performance in conventional external walls of concrete buildings in hot regions. Three environmentally friendly scenarios were introduced to enhance the efficiency of the walls against heat transfer. The results showed that the combination of an air layer and a green layer on the exterior side of the wall yielded the best thermal performance.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Agricultural Engineering
Zihao Wang, Jiewei Tong, Bingbin Kuai, Jingshu Gao, Yaoli Zhang, Maurizio Manzo, Liping Cai
Summary: By adding fluorescent powder, the fluorescent transparent bamboo (FTB) with exceptional fluorescent performance was innovatively developed. FTB has good optical durability and thermal dimensional stability.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Materials Science, Multidisciplinary
Takafumi Ogawa, Tsuneaki Matsudaira, Daisaku Yokoe, Emi Kawai, Naoki Kawashima, Craig A. J. Fisher, Yoichiro Habu, Takeharu Kato, Satoshi Kitaoka
Summary: The study shows that YbTa3O9 with spontaneously formed nanostructures has a thermal conductivity lower than commercial-level TBC materials due to periodic strain between boundaries. Additionally, YbTa3O9 exhibits thermal expansion characteristics similar to 7YSZ, suggesting its potential as a TBC material.
Article
Chemistry, Multidisciplinary
Cam-Phu Thi Nguyen, Peggy Schoenherr, Jan Seidel
Summary: The functionality of domain walls and other topological defects in ferroelectrics is being extensively studied for applications in electronic devices. This study presents an in-depth investigation of the nanomechanical properties at 90° domain walls and adjacent domains in single-crystalline lead titanate (PbTiO3) using various AFM-based methods. Significant variations in elastic moduli are observed at 90° domain walls, extending up to approximately 100 nm into the domain areas. AFM nanoindentation is also used to measure local domain wall hardness and deformation energies. These findings have implications for the design of ferroelectric domain wall functionality that incorporates the intrinsic elastic compliance of a domain wall.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Gal Shachar Michaely, Dimitry Alhazov, Michael Genkin, Matat Buzaglo, Oren Regev
Summary: Oil is utilized as an 'entrance door' to load carbon-based fillers of various sizes and dimensionalities, enhancing the properties of rubber composite materials. The CNT-loaded system demonstrates the best mechanical properties enhancement, while a system loaded with both graphite and GNP shows the highest enhancement in thermal conductivity. The overall relative efficiency index indicates that the CNT-loaded system is the most efficient in enhancing properties at low filler concentrations.
Article
Chemistry, Multidisciplinary
Haoran Yu, Michael J. Zachman, Kimberly S. Reeves, Jae Hyung Park, Nancy N. Kariuki, Leiming Hu, Rangachary Mukundan, Kenneth C. Neyerlin, Deborah J. Myers, David A. Cullen
Summary: Nanoparticles are important materials with unique properties due to their high surface area-to-volume ratio. Scanning transmission electron microscopy (STEM) allows direct visualization of composition and morphology of nanoparticles with atomic precision. However, traditional manual STEM measurements have limitations in sample size, while automated STEM techniques enable high-resolution characterization of nanoparticle properties at sub-micron length scales.
Review
Materials Science, Textiles
Ella Comish, Rosie Lester, Darshil U. Shah
Summary: This literature review summarizes natural silk production processes and compares them to various approaches to processing artificial silks. The structure, properties, and sustainability of artificial silks are critically evaluated in comparison to natural silks, aiming to encourage future-oriented design of artificial silk production processes.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Materials Science, Paper & Wood
Claudia Gusenbauer, Karolina Peter, Etienne Cabane, Johannes Konnerth
Summary: Chemical force microscopy allows visualization of chemical nano-properties of materials and analysis of their surface behavior, making it valuable for studying natural substrates like wood. By studying adhesion forces and pK(a) values, this method provides insights into the complex chemical surface properties of materials.
Article
Engineering, Chemical
Elena Averina, Johannes Konnerth, Hendrikus W. G. van Herwijnen
Summary: This study used corn gluten protein, potato protein, and pea protein isolate as natural raw materials for preparing bio-based environmentally friendly adhesives. Glyoxal and polyethyleneimine were used as crosslinking agents. The results showed that crosslinking by glyoxal and polyethyleneimine effectively improved the bonding performance of the protein-based adhesives after water storage.
JOURNAL OF ADHESION
(2023)
Article
Engineering, Chemical
Cedou Kumpenza, Maximilian Pramreiter, Tobias Josef Nenning, Peter Bliem, Rainer Reiterer, Johannes Konnerth, Ulrich Mueller
Summary: This study investigated the tensile modulus of four common polymer-based wood adhesives at different temperatures and found a significant influence of temperature on the tensile modulus. The results showed that the highest tensile moduli were observed at -30 degrees C and decreased significantly with increasing temperature.
JOURNAL OF ADHESION
(2023)
Correction
Polymer Science
Delphin Pantaloni, Alessia Melelli, Johnny Beaugrand, Darshil U. Shah, Christophe Baley, Alain Bourmaud
POLYMER DEGRADATION AND STABILITY
(2022)
Review
Polymer Science
Supitta Suethao, Thridsawan Prasopdee, Kwanchai Buaksuntear, Darshil U. Shah, Wirasak Smitthipong
Summary: Shape memory elastomers (SMEs) are a new type of material that can undergo reversible shape changes in response to external stimuli such as temperature and pressure. They have significant potential for innovation in the end-of-life management of polymeric materials and offer broad applications in biotechnology.
Article
Energy & Fuels
Wilfried Sailer-Kronlachner, Catherine Rosenfeld, Stefan Boehmdorfer, Markus Bacher, Johannes Konnerth, Thomas Rosenau, Antje Potthast, Andreas Geyer, Hendrikus W. G. van Herwijnen
Summary: A batch reaction system with a volume of 1L was developed for the scaled-up production of 5-HMF-based adhesive precursor solutions from industrially available fructose syrup. The stabilizing effect of sodium dithionite addition was demonstrated. The optimized reaction system allows the production of reaction solutions with appropriate 5-HMF concentrations for adhesive synthesis without the need for concentration steps.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Engineering, Chemical
Babureddy Ramachandrareddy, Hendrikus W. G. van Herwijnen, Greeley Beck, Ronny Bredesen, Johannes Konnerth
Summary: According to Eurocode/ European standard, the design of timber structures and wood-based panels for different expected uses is divided into various service classes, taking into account the moisture ranges that may be encountered. It has been observed that the moisture content in the adherend significantly affects the bond lines of wood-adhesive joints. In this study, nanoindentation was used to investigate the influence of moisture on the mechanical properties of commonly used wood adhesive systems. The results showed that different adhesive systems exhibited varying degrees of stability under different relative humidity levels.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2022)
Article
Polymer Science
Elena Averina, Johannes Konnerth, Hendrikus W. G. van Herwijnen
Summary: The use of proteins obtained from starch production as wood adhesives was investigated. The addition of glyoxal as a crosslinking agent improved the wet strength of protein-based adhesives. The pH level had a significant effect on the wet strength.
Article
Chemistry, Physical
Catherine Rosenfeld, Pia Solt-Rindler, Wilfried Sailer-Kronlachner, Thomas Kuncinger, Johannes Konnerth, Andreas Geyer, Hendrikus W. G. van Herwijnen
Summary: This study evaluates the performance of laboratory-made, single-layered particleboards using fructose-hydroxymethylfurfural-bishexamethylenetriamine (SusB) adhesive as a sustainable alternative. The effects of production parameters on bonding efficiency were investigated, with moisture content having the highest impact on the internal bond strength of SusB-bonded particleboards. By reducing the moisture content, the internal bond strength surpasses the European standard requirements. However, further research is needed to improve the dimensional stabilization of SusB-bonded particleboards.
Article
Multidisciplinary Sciences
Ramit Debnath, Ronita Bardhan, Darshil U. Shah, Kamiar Mohaddes, Michael H. Ramage, R. Michael Alvarez, Benjamin K. Sovacool
Summary: This study analyzes the public sentiments and emotions on social media regarding emissions reduction in the building sector. The findings suggest that discussions on topics such as green building, low-carbon construction, and energy efficiency have a significant influence on shaping public perceptions of climate action. Positive sentiments dominate the online climate action discourse, but negative sentiments show a rise following major policy events. Additionally, social and environmental justice topics emerge in the online conversation.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Chemical
Christoph Winkler, Johannes Konnerth, Matthias Finger, Ulrich Schwarz, Benjamin Arminger
Summary: Wood adhesive bond lines are often assumed to be chemically and mechanically homogeneous, but this study finds that there are variations in their mechanical and chemical properties. Different filtration mechanisms of the wood adherend or porous barriers formed by filler particles contribute to differences in filler distribution. These findings suggest that assuming the wood bond line as a homogeneous material in micromechanical modeling of adhesive bonds may not be valid.
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Chemical
Elena Averina, Johannes Konnerth, Hendrikus W. G. van Herwijnen, Kaichang Li
Summary: Poly (styrene-4-vinylbenzyl chloride) (PSVBC) was synthesized and used in protein adhesives for bonding maple veneers. The effects of various factors on shear strength and water resistance were studied. PSVBC improved the wet shear strength of potato and corn protein adhesives, but not pea protein adhesive.
JOURNAL OF ADHESION
(2023)
Article
Materials Science, Multidisciplinary
Latifeh Nasseri, Catherine Rosenfeld, Pia Solt, Matthias Mihalic, Andreas Kandelbauer, Johannes Konnerth, Hendrikus W. G. van Herwijnen
Summary: This study compares the gel point and crossover point of formaldehyde-based wood adhesives using the isothermal multiwave oscillatory shear test. Rheokinetic analysis shows no significant difference in activation energies between the gel point determined by the multiwave test and the crossover point obtained by the time sweep test.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Materials Science, Composites
Shaima Bellil, Delphin Pantaloni, Darshil U. Shah, Antoine Le Duigou, Christophe Baley, Johnny Beaugrand, Alain Bourmaud, Sofiane Guessasma
Summary: In this study, a predictive approach using microdroplet test and finite element modeling was utilized to investigate the quality of interface for polymer drops bonded single flax fiber. The results showed that the interfacial stiffness and fiber-matrix separation displacement played a crucial role in triggering the debonding behavior. The best performing system was found to be flax fiber/PLA, with a maximum fiber-matrix separation of 156 μm and an interfacial stiffness of 47 GPa/mm, while the worst performing system was flax fiber/PP, with a limited fiber-matrix separation of 55 μm. The proposed numerical model was able to capture the interfacial shear behavior of polymeric drops bonded to a single flax fiber.
COMPOSITES PART C: OPEN ACCESS
(2023)