Article
Construction & Building Technology
Fuyuan Gong, Stefan Jacobsen, Pengfei Li, Zhao Wang, Koichi Maekawa, Marcin Koniorczyk
Summary: The phase change and phase equilibrium of pore water can affect many physical and mechanical behaviors of cement-based materials, and the prediction of liquid/gas/ice content during adsorption-desorption and freezing-thawing process is crucial for engineering purposes.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Biophysics
Zahra Seifollahi, Seyed Nezameddin Ashrafizadeh
Summary: In this paper, the impact of ionic size on electroosmotic flow in an ion-selective soft slit nanochannel is analytically studied. The results show the importance of considering ionic size in the calculation and demonstrate the amplifying effect of steric effect on the electroosmotic velocity.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Xingyi Lyu, Max Meirow, Xun Wu, Xinwei Zhou, Yuzi Liu, Wenyu Huang, Tao Li, Byeongdu Lee
Summary: The mesoporous silica shell coating the hydrogenolysis nano-catalyst alters the molecular weight distributions of cleaved polymer chains compared to catalysts without a shell. The shell reduces low-valued gaseous products and increases the median molecular weight of the product, enhancing the value of the products for polymer upcycling. The spatial distribution of polystyrene chains in the nanochannels reveals a non-uniform distribution for longer chains.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Organic
Soumen Barik, Rohan Chandra Das, Kuruva Balanna, Akkattu T. Biju
Summary: Chiral NHC-catalyzed kinetic resolution allows the synthesis of C-N axially chiral N-aryl aminomaleimides via remote chirality control. The reaction shows high stereoselectivity, yielding the desired product, and studies on C-N bond rotation and temperature dependence are provided.
Article
Electrochemistry
Changzheng Li, Zhe Zhang, Zhenquan Li, Nan Qiao, Zheng Liu, Zhi Qun Tian
Summary: In this study, the effects of different boundary conditions on ion concentration distribution, velocity, and energy conversion performance in nanochannels were investigated. The results show that boundary slip can significantly improve the power generation performance. Furthermore, the power generation performance under independent slip and dependent slip deviates due to the restriction of surface charge on boundary slip. The findings provide useful information for the design and optimization of nanochannel power generation.
ELECTROCHIMICA ACTA
(2023)
Article
Optics
Lichao Zhang, Jiamin Chen, Weichao Ma, Guangyuan Chen, Ruoming Li, Wangzhe Li, Junming An, Jiashun Zhang, Yue Wang, Guangyang Gou, Chunxiu Liu, Zhimei Qi, Ning Xue
Summary: This paper introduces four basic bending methods and proposes an n-adjustable (NA) bend that can achieve lower losses compared to other basic bends by adjusting n values. The circular bend and Euler bend are special cases of the proposed NA bend. The proposed bend shows promise as a candidate for low-loss compact photonic integrated circuits.
Article
Chemistry, Multidisciplinary
Junxi Zhang, Huaping Zhao, Ming Gong, Lide Zhang, Zhijun Yan, Kang Xie, Guangtao Fei, Xiaoguang Zhu, Mingguang Kong, Shuyuan Zhang, Lin Zhang, Yong Lei
Summary: The nonuniformity of the nanochannel geometry in anodic aluminium oxide (AAO) membranes can affect their applications and the reflectance properties of nanostructures. Using depth-profiling transmission electron microscopy, the truncated conical geometry of the entire nanochannels was revealed, and an effective etching method was introduced to remove the nonuniformity.
Article
Chemistry, Physical
Xing-Yue He, Yun-Zhu Liu, Jiao-Jiao Chen, Xingwang Lan, Xiao-Na Li, Sheng-Gui He
Summary: A study using a tandem mass spectrometer and a high-temperature ion-trap reactor revealed the increased reactivity of Co20-25 (-) clusters. This finding contributes to the understanding of the property evolution of subnanometer metal clusters (Co-25 (-)) at the atomic level. By analyzing the reactions of smaller Co6-8 (-) clusters, the reasons behind the increased reactivity of Co20-25 (-) were proposed.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Mathematics
Jiaxuan Zheng, Beinan Jia, Yongjun Jian
Summary: The influence of steric effects on the performances of space electroosmotic thrusters (EOTs) was numerically analyzed in soft nanochannels covered with polyelectrolyte materials. The size effect of ionic species, known as steric effect, has significant impacts on electrostatic potential and electroosmotic velocity, affecting the thruster's thrust, specific impulse, total input power, efficiency, and thrust-to-power ratio. Although the thruster's thrust may increase with the steric parameter, the efficiency is only 30-70% in real situations taking ion size into consideration, with the peak values of thrust-to-power ratio diminishing.
Article
Thermodynamics
Mohammad Karimzadeh, Mahdi Khatibi, Seyed Nezameddin Ashrafizadeh
Summary: The study investigated the effects of temperature and concentration gradients on ionic selectivity, ionic current rectification, Joule heating, and viscosity dissipation in conical soft nanochannels through numerical simulations. It was found that increasing temperature and concentration ratios can lead to higher levels of Joule heating, potentially affecting the transport behavior of ionic species within soft nanochannels. Overall, it was concluded that lack of control in Joule heating generation could be detrimental to the transport behavior of ions in soft nanochannels.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Biochemical Research Methods
Tao Liu, Xiaohan He, Juncheng Zhao, Liuyong Shi, Teng Zhou, Liping Wen
Summary: In recent years, researchers have made significant progress in understanding and developing nanochannel membranes with optimal ion transport properties and high stability. This article focuses on the stability of ion transport characteristics in cylindrical nanochannel structures, categorized based on the generation of bipolar surface charges through pH gradients or different materials. The findings indicate that pH gradient-generated bipolar nanochannels demonstrate more stable ion selection, while material-generated bipolar nanochannels show stronger stability in ion rectification. This conclusion provides a theoretical foundation for future nanochannel designs.
Article
Environmental Sciences
Athanasios Besis, Domniki Gallou, Anna Avgenikou, Eleni Serafeim, Constantini Samara
Summary: This study collected and analyzed samples of atmospheric particulate matter pollution in Greece, finding that organic pollutant concentrations were significantly lower in the warm period compared to the cold period. The highest concentrations of these compounds were found in particles with a size fraction smaller than 0.49 μm. The results also showed no clear correlation between particle size and bioaccessibility, but the bioaccessibility of PAHs and PAH derivatives was higher in coarse particles.
ENVIRONMENTAL POLLUTION
(2022)
Article
Engineering, Chemical
Chunyang Fan, Li Cao, Chao Yang, Qianxiang Xiao, Xinda You, Xiaoyao Wang, Yan Kong, Hong Wu, Yawei Liu, Zhongyi Jiang
Summary: This study fabricates COF membranes with one-dimensional charged nanochannels using ionic COF nanosheets decorated with sulfonic acid groups, and finds that the membrane exhibits enhanced proton conductivity and suppressed methanol permeability. All-atomistic dynamics simulations suggest that the low and nearly constant methanol permeability of the COF membrane is due to the diffusio-osmotic effect arising from the charged nanochannels.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Ke Zhou, Shuping Jiao, Yan Chen, Huasong Qin, Yilun Liu
Summary: This study is based on atomistic simulations to investigate the factors affecting ionic conductivity in nanochannels, revealing different ionic conductivity properties in the channel interior and near the channel wall, and proposing a new model to describe the ionic dynamics.
Article
Chemistry, Multidisciplinary
Sagi Hacmon, Shir R. R. Liber, Lee Shool, Alexander V. V. Butenko, Ayelet Atkins, Eli Sloutskin
Summary: Adding long-chain alcohols to the bulk of oil-in-water emulsion droplets can adjust the temperature at which they undergo a phase transition, leading to significant changes in their interfacial structures. The self-assembly of mixed alcohol:alkane interfacial structures, consisting of stacked alkane layers co-crystallized with hydrogen-bonded alcohol dimers, was found to maximize the phase transition temperature. This discovery, supported by theoretical modeling and direct cryogenic transmission electron microscopy, highlights the tunability of important properties in emulsions through minute concentrations of specific additives.
Article
Chemistry, Multidisciplinary
Manuel Brinker, Patrick Huber
Summary: Electrosorption-induced mechanical stress generation of up to 600 kPa in large-scale nanoporous silicon cantilevers wetted by aqueous electrolytes is reversible and adjustable at will by potential variations of approximate to 1 V. This electro-actuation is traced to the concerted action of 100 billions of parallel nanopores per square centimeter cross-section and determination of the capacitive charge-stress coupling parameter upon ion adsorption and desorption.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Johannes Gaeding, Gabriele Tocci, Mark Busch, Patrick Huber, Robert H. Meissner
Summary: Polarizability is a crucial factor in accurately describing different ionic systems. This study emphasizes the importance of including polarizable surfaces in molecular dynamics simulations of confined ionic liquids. The introduction of surface polarizability affects the dipole orientation, density distribution, and molecular diffusivity at the interface, highlighting the significance of considering not only the polarizability of the ionic liquid but also that of the surface.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Diego Diaz, Ole Nickel, Nicolas Moraga, Rodrigo E. Catalan, Maria Jose Retamal, Hugo Zelada, Marcelo Cisternas, Robert Meissner, Patrick Huber, Tomas P. Corrales, Ulrich G. Volkmann
Summary: The study demonstrates that water molecules can effectively hydrophilize initially hydrophobic surfaces consisting of weakly bound hydrocarbon carpets, even if the carpets were initially prepared with hydrophobic alkane molecules. By changing the dip-coating velocity, surface coverage can be controlled, achieving films with different morphologies.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Benjamin Malfait, Alain Moreac, Aicha Jani, Ronan Lefort, Patrick Huber, Michael Froeba, Denis Morineau
Summary: The temperature dependence of water structure in hydrophilic and hydrophobic mesostructured porous materials was studied using Raman vibrational spectroscopy. The structure of water in capillary filled pores is similar to bulk water, while the structure in partially filled pores differs significantly.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Joeri Smits, Rajendra Prasad Giri, Chen Shen, Diogo Mendonca, Bridget Murphy, Patrick Huber, Kurosch Rezwan, Michael Maas
Summary: Experimental study on the wetting properties of nanoparticles at different interfaces found that the receding contact angle on smooth surfaces provides a good estimate of nanoparticle wetting properties, while macroscopic contact angles alone cannot predict adsorption barriers that prevent nanoparticles from segregating to the interface.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Mohamed A. Kolmangadi, Glen J. Smales, Li ZhuoQing, Arda Yildirim, Eugen Wuckert, Sandy Eutionnat, Felix Demel, Patrick Huber, Sabine Laschat, Andreas Schoenhals
Summary: This study investigates the molecular mobility and electrical conductivity of a series of linear shaped columnar ionic liquid crystals with varying alkyl chain lengths. The results show that both the dynamics and electric conductivity of the system are influenced by the chain length. The study provides insights into the relationship between molecular structure and electrical properties.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Fernando Vazquez Luna, Anjani K. Maurya, Juliana Martins de Souza e Silva, Guido Dittrich, Theresa Paul, Dirk Enke, Patrick Huber, Ralf Wehrspohn, Martin Steinhart
Summary: In this study, we comparatively analyzed the imbibition of polystyrene into two different pore models using X-ray computed tomography and EDX spectroscopy. The results showed that the movement of the imbibition front was influenced by the tortuosity of the porous matrix, with slower movement in larger pore models and faster movement in smaller pore models with more nodes. This research has important implications for applications such as printing and adhesive bonding, as well as for the optimization of production and properties of engineering materials.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Applied
Natalia Gostkowska-Lekner, Danny Kojda, Jan-Ekkehard Hoffmann, Manfred May, Patrick Huber, Klaus Habicht, Tommy Hofmann
Summary: Organic-inorganic hybrids are functional materials that combine the favorable properties of organic molecules and inorganic matrices to achieve improved overall performance for various applications. This study incorporated the conjugated polymer P3HT into a porous silicon matrix and demonstrated that subsequent diffusion-based doping significantly enhanced the electrical conductivity of the hybrid material.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Physics, Multidisciplinary
Pai Zhao, Chithra H. Sharma, Renrong Liang, Christian Glasenapp, Lev Mourokh, Vadim M. Kovalev, Patrick Huber, Marta Prada, Lars Tiemann, Robert H. Blick
Summary: This study demonstrates the tunability of strong gauge fields in nonlocal experiments using a large planar graphene sheet that conforms to the deformation of a piezoelectric layer by a surface acoustic wave. The acoustic wave induces a longitudinal and a giant synthetic Hall voltage in the absence of external magnetic fields, and the superposition of a synthetic Hall potential and a conventional Hall voltage can annihilate the sample's transverse potential at large external magnetic fields. Surface acoustic waves provide a promising and facile avenue for the exploitation of gauge fields in large planar graphene systems.
PHYSICAL REVIEW LETTERS
(2022)
Article
Spectroscopy
Yaroslav Shchur, Guillermo Beltramo, Anatolii S. Andrushchak, Svetlana Vitusevich, Patrick Huber, Volodymyr Adamiv, Ihor Teslyuk, Nazarii Boichuk, Andriy Kityk
Summary: The lattice dynamics of preferentially aligned nanocrystals formed by drying aqueous Ba(NO3)(2) solutions in mesoporous silica glass are investigated. The Raman scattering experiment indicates that the peak positions and intensities of the Raman spectra of the nanoconfined and macroscopic crystals are identical. Interestingly, comparatively large single-crystalline regions of Ba(NO3)(2) embedded in the porous host are observed.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Physics, Applied
Benjamin Maillet, Guido Dittrich, Patrick Huber, Philippe Coussot
Summary: Drying plays a crucial role in the fabrication and application of functional nanoporous materials. This study uses magnetic resonance imaging to observe the drying process of a model nanoporous material and proposes a predictive model to describe the drying characteristics based on parameters such as pore size, permeability, and desorption curve.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Multidisciplinary
Stella Gries, Manuel Brinker, Berit Zeller-Plumhoff, Dagmar Rings, Tobias Krekeler, Elena Longo, Imke Greving, Patrick Huber
Summary: Many biological materials have both small nanoscale pores and large macroscopic capillaries, allowing for optimized mass transport and lightweight structures. This study presents a novel approach to create hierarchical porosity in artificial materials using metal-assisted chemical etching (MACE) and photolithography, resulting in single-crystalline silicon with bimodal pore size distribution. The process involves a metal-catalyzed reduction-oxidation reaction and silver nanoparticles acting as catalysts. The resulting hierarchically porous silicon membranes have potential applications in energy storage, sensorics, and opto-fluidic applications.
Article
Nanoscience & Nanotechnology
Mohamed Aejaz Kolmangadi, Zhuoqing Li, Glen J. Smales, Brian R. Pauw, Eugen Wuckert, Aileen Raab, Sabine Laschat, Patrick Huber, Andreas Schoenhals
Summary: This study investigates the molecular mobility and phase transition behavior of a guanidinium-based columnar ionic liquid crystal confined in nanopores. The results show that the pore size and surface wettability significantly affect the molecular dynamics and phase transition behavior of the system.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Alexander Meinhardt, Pirmin Lakner, Patrick Huber, Thomas F. Keller
Summary: This study investigates the changes in thickness and Young modulus of perchlorate doped polypyrrole thin film under potential-induced variations using electrochemical atomic force microscopy. The results show that the thickness and Young modulus of the film increase linearly during oxidation and decrease during reduction. Additionally, the study reveals the complex relationship between the surface topography and elastic properties of the polypyrrole film.
NANOSCALE ADVANCES
(2023)
Article
Chemistry, Physical
Arda Yildirim, Christina Krause, Patrick Huber, Andreas Schoenhals
Summary: This study investigates the phase behavior and molecular dynamics of HATn with different alkyl chain lengths using various techniques. The results reveal the significant impact of alkyl chain length on the system properties and provide detailed discussion on the observed relaxation processes.
JOURNAL OF MOLECULAR LIQUIDS
(2022)