Surfaces Pub Date : 2024-08-09 DOI: 10.3390/surfaces7030037

M. Namie, Jun-ichi Saito, Asuka Ikeda, Ryotaro Oka, Jae-Ho Kim

引用次数: 0

Evaluation of Photocatalytic Hydrogen Evolution in Zr-Doped TiO2 Thin Films 评估掺杂 Zr 的二氧化钛薄膜中的光催化氢气挥发

Surfaces Pub Date : 2024-08-09 DOI: 10.3390/surfaces7030038

L. F. Garay-Rodríguez, M. R. Alfaro Cruz, Julio González-Ibarra, L. Torres-Martínez, Jin Hyeok Kim

{"title":"Evaluation of Photocatalytic Hydrogen Evolution in Zr-Doped TiO2 Thin Films","authors":"L. F. Garay-Rodríguez, M. R. Alfaro Cruz, Julio González-Ibarra, L. Torres-Martínez, Jin Hyeok Kim","doi":"10.3390/surfaces7030038","DOIUrl":"https://doi.org/10.3390/surfaces7030038","url":null,"abstract":"Doping titanium dioxide has become a strategy for enhancing its properties and reducing its recombination issues, with the aim of increasing its efficiency in photocatalytic processes. In this context, this work studied its deposition over glass substrates using a sol–gel dip coating methodology. The effect of doping TiO2 with Zirconium cations in low molar concentrations (0.01, 0.05, 0.1%) in terms of its structural and optical properties was evaluated. The structural characterization confirmed the formation of amorphous thin films with Zr introduced into the TiO2 cell (confirmed by XPS characterization), in addition to increasing and defining the formed particles and their size slightly. These changes resulted in a decrease in the transmittance percentage and their energy band gap. Otherwise, their photocatalytic properties were evaluated in hydrogen production using ethanol as a sacrificial agent and UV irradiation. The hydrogen evolution increased as a function of the Zr doping, the sample with the largest Zr concentration (0.1% mol) being the most efficient, evolving 38.6 mmolcm−2 of this gas. Zr doping favored the formation of defects in TiO2, being responsible for this enhancement in photoactivity.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":"22 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141925161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of the Feasibility of the Prediction of the Surface Morphologiesof AWJ-Milled Pockets by Statistical Methods Based on Multiple Roughness Indicators 基于多种粗糙度指标的统计方法对 AWJ 铣槽表面形态预测的可行性评估

Surfaces Pub Date : 2024-05-10 DOI: 10.3390/surfaces7020021

N. Karkalos, M. Thangaraj, P. Karmiris-Obratański

{"title":"Evaluation of the Feasibility of the Prediction of the Surface Morphologiesof AWJ-Milled Pockets by Statistical Methods Based on Multiple Roughness Indicators","authors":"N. Karkalos, M. Thangaraj, P. Karmiris-Obratański","doi":"10.3390/surfaces7020021","DOIUrl":"https://doi.org/10.3390/surfaces7020021","url":null,"abstract":"Improvement of the surface quality of machined parts is essential in order to avoid excessive and costly post-processing. Although non-conventional processes can efficiently carry out the machining of difficult-to-cut materials with high productivity, they may also, for various reasons, be related to increased surface roughness. In order to optimize the surface quality of generated surfaces in a reliable way, surface profiles obtained during these processes must be adequately modeled. However, given that most studies have focused on Ra or Rz indicators or are based on the assumption of a normal distribution for the profile heights, relevant models cannot accurately represent the surface characteristics that exist in a real machined surface with a high degree of accuracy. Thus, in the present study, a new modeling approach based on the use of a statistical probability distribution for the surface profile height is proposed. After six different distributions were evaluated on the basis of a three-stage procedure involving different roughness indicators pertaining to the abrasive waterjet (AWJ) milling of pockets, it was found that, although it is not possible to model the nominal values of every roughness parameter simultaneously, in several cases, it is possible to approximate the values of critical indicators such as Ra, Rz, Rsk, Rku and Rp/Rv ratio by Weibull distribution with a sufficient degree of accuracy.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":" 75","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140990666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Formation of Organic Monolayers on KF-Etched Si Surfaces KF 刻蚀硅表面有机单层的形成

Surfaces Pub Date : 2024-05-10 DOI: 10.3390/surfaces7020022

Tiexin Li, Zane Datson, Nadim Darwish

{"title":"Formation of Organic Monolayers on KF-Etched Si Surfaces","authors":"Tiexin Li, Zane Datson, Nadim Darwish","doi":"10.3390/surfaces7020022","DOIUrl":"https://doi.org/10.3390/surfaces7020022","url":null,"abstract":"Silicon is the most commonly used material in the microelectronics industry, due to its inherent advantages of high natural abundance, low cost, and high purity, coupled with the chemical and electrical stability at the interface with its oxide. For molecular electronics applications, oxide-free Si surfaces are widely used because of the relative ease of removing the oxide (SiOx) by chemical means, yielding a surface which forms strong covalent bonds with a wide range of chemical functional groups; another advantage is that these surfaces remain oxide-free in the absence of oxidising agents. Standard procedures require the use of either HF, NH4F, or a mixture of both as the etching solution; however, these two chemicals are highly corrosive and toxic, posing a significant risk to the experimentalist. Here, we report that for silicon wafers etched by using potassium fluoride, a less toxic chemical, the resulting surface is free of oxides and can be functionalized by self-assembled monolayers of 1,8-nonadiyne. To demonstrate this, Si/SiOx wafers were etched by using either KF or NH4F, followed by hydrosilylation with 1,8-nonadiyne and a click reaction of the terminal alkyne with azidomethylferrocene. The surface coverages and electron transfer kinetics of the ferrocene-terminated KF-etched surfaces are comparable to those formed by acidic fluoride etching procedures. This is the first study comparing the differences between surfaces functionalized by self-assembled monolayers of 1,8-nonadiyne which were etched by KF and NH4F. KF could be used as a replacement chemical for etching silicon wafers when a less corrosive and toxic chemical is required.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":" 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140991432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Metal–Perovskite Interfacial Engineering to Boost Activity in Heterogeneous Catalysis 通过金属-珀罗维斯基岩界面工程提高异质催化活性

Surfaces Pub Date : 2024-05-06 DOI: 10.3390/surfaces7020020

Christoph Malleier, Simon Penner

{"title":"Metal–Perovskite Interfacial Engineering to Boost Activity in Heterogeneous Catalysis","authors":"Christoph Malleier, Simon Penner","doi":"10.3390/surfaces7020020","DOIUrl":"https://doi.org/10.3390/surfaces7020020","url":null,"abstract":"In this review, we have assessed the possibility of metal–perovskite interfacial engineering to enhance the catalytic activity and selectivity in a range of heterogeneous catalytic reactions. We embarked on a literature screening of different perovskite material classes and reactions to show the versatility of the perovskite structures to induce the formation of such hetero-interfaces and the widespread nature of the phenomenon in catalytic research. There is almost no limitation on the chemical composition of the used perovskites and the nature of the catalyzed reaction, be it under reduction or oxidation conditions. We attempted to classify the perovskite materials, discuss the different strategies leading to the hetero-interfaces, and detail the synergistic action of the components of the respective interfaces. We also provide a critical assessment of the large body of data that is available in terms of a knowledge-based approach to the comparison of differently prepared interfaces with varying interfacial extent to gain a deeper understanding of the bi-functional operation of the interfaces and the urgent necessity to study and characterize such interfaces under realistic operation conditions.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141007415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fluorine Free Surface Modification of Microfibrillated Cellulose-Clay Composite Films: Effect of Hydrophobicity on Gas Barrier Performance 微纤维素-粘土复合薄膜的无氟表面改性：疏水性对气体阻隔性能的影响

Surfaces Pub Date : 2024-05-01 DOI: 10.3390/surfaces7020019

M. A. Poothanari, Y. Leterrier

{"title":"Fluorine Free Surface Modification of Microfibrillated Cellulose-Clay Composite Films: Effect of Hydrophobicity on Gas Barrier Performance","authors":"M. A. Poothanari, Y. Leterrier","doi":"10.3390/surfaces7020019","DOIUrl":"https://doi.org/10.3390/surfaces7020019","url":null,"abstract":"Diffusion barrier composite films based on microfibrillated cellulose (MFC) and clay were developed with attention paid to the influence of thermal annealing and a fluorine-free surface silylation on their microstructure, water contact angle (WCA), mechanical properties, oxygen transmission rate (OTR), and water vapor transmission rate (WVTR). The OTR of MFC at 23 °C increased from 1.2 to 25.3 cm3/m2/day/bar as relative humidity increased from 50% to 80%. Annealing increased the film’s crystallinity, surface roughness, and hydrophobicity, while decreasing its OTR by 20% at 80%RH. The addition of clay led to a 30% decrease of OTR at 80%RH due to partial exfoliation and to a 50% decrease when combined with annealing. Silylation increased the hydrophobicity of surface of the film and its combination with clay and annealing led to a WCA of 146.5°. The combination of clay, annealing, and silylation considerably reduced the OTR at 80%RH to a value of 8 cm3/m2/day/bar, and the WVTR at 23 °C and 50%RH from 49 g/m2/day for MFC to 22 g/m2/day. The reduction of OTR and WVTR was found to correlate with the increase in surface hydrophobicity of the film, which was attributed to the reduced access of water molecules within the MFC network.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":"30 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141029874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microcalorimetry Techniques for Studying Interactions at Solid–Liquid Interface: A Review 研究固液界面相互作用的微量热技术：综述

Surfaces Pub Date : 2024-04-23 DOI: 10.3390/surfaces7020018

Heshu Hu, Jiazhong Wu, Minghui Zhang

{"title":"Microcalorimetry Techniques for Studying Interactions at Solid–Liquid Interface: A Review","authors":"Heshu Hu, Jiazhong Wu, Minghui Zhang","doi":"10.3390/surfaces7020018","DOIUrl":"https://doi.org/10.3390/surfaces7020018","url":null,"abstract":"Solid–liquid interfacial phenomena play an essential role in our everyday lives and are often regarded as the outcome of interactions at the solid–liquid interface. However, the intricately intrinsic mechanism underlying interfacial interactions renders in situ simulations and direct measurements challenging. As an effective analytic method for studying solid–liquid interfacial interactions, microcalorimetry can provide the most basic thermodynamic information (including changes in enthalpy, entropy, and Gibbs free energy during solid–liquid binding/separation processes), which is extremely crucial for understanding interaction directionality and limitation. This review is dedicated to highlighting the pivotal role of microcalorimetry in studying solid–liquid immersion and adsorption processes. Specifically, we provide an overview of the commonly employed microcalorimetric methods, including differential scanning calorimetry (DSC), isothermal titration calorimetry (ITC), and immersion microcalorimetry (IM), and delve into the influence factors of enthalpy change, and finally discuss the specific applications of microcalorimetry in studying various solid–liquid binding processes. There remains a vast expanse of thermodynamic information regarding solid–liquid interactions that await exploration via calorimetry.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":"139 29","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140668750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface and Aggregation Properties of Rhamnolipids in Water–Bioethanol Mixtures: A Step toward Green Formulation Design 水-生物乙醇混合物中鼠李糖脂的表面和聚集特性：向绿色配方设计迈进

Surfaces Pub Date : 2024-04-07 DOI: 10.3390/surfaces7020017

R. Esposito, F. Taddeo, V. Russo, I. Russo Krauss, G. D’Errico

{"title":"Surface and Aggregation Properties of Rhamnolipids in Water–Bioethanol Mixtures: A Step toward Green Formulation Design","authors":"R. Esposito, F. Taddeo, V. Russo, I. Russo Krauss, G. D’Errico","doi":"10.3390/surfaces7020017","DOIUrl":"https://doi.org/10.3390/surfaces7020017","url":null,"abstract":"Water–ethanol mixtures are largely exploited for many different applications, from industrial processes to pharmaceutical formulations. Surfactants are often added to tune their interfacial properties. Sustainability concerns require redesigning such blends to minimize their environmental impact. A successful approach is to replace synthetic oil-based components with affordable unpurified bio-derived alternatives. In this respect, we have characterized aqueous mixtures of bioethanol, obtained by the fermentation of algae, and rhamnolipids, biosurfactants of microbial origin. The physico-chemical characterization of water–bioethanol binary mixtures in terms of refractive index, density, viscosity, and surface tension indicates that bioethanol behaves like pure ethanol with negligible effects of impurities. Analysis of tensiometric titrations shows that, at bioethanol contents higher than 20–30% bioethanol mass percent, rhamnolipid aggregation is impaired, whereas surface adsorption at the water–air interface remains poorly affected. Overall, bio-derived components can be proposed as a promising alternative to oil-derived chemicals in eco-sustainable formulations.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":"63 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140733003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Route towards Durable Underwater Stable Superhydrophobic Surfaces: PET-Reinforced Candle Soot Layers 实现耐用的水下稳定超疏水表面的途径：PET 增强型蜡烛烟灰层

Surfaces Pub Date : 2024-04-02 DOI: 10.3390/surfaces7020015

Xinghua Wu, Zhaokang Han, Yuchao Wang, Yutong Pan, Xiaohua Jie

引用次数: 0

Study on the Sound Absorption Properties of Recycled Polyester Nonwovens through Alkaline Treatment and Dimple Processing 通过碱性处理和凹点加工研究回收聚酯无纺布的吸音特性

Surfaces Pub Date : 2024-04-02 DOI: 10.3390/surfaces7020016

G. Yu, J. Park, Eun Hye Kang, Sun Young Lee, Youl Huh, Seung Goo Lee

引用次数: 0

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