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Rodriguez C, Torres-Costa V, Bittner A, Morin S, Cascajo Castresana M, Chiriaev S, Modin E, Chuvilin A, Manso Silván M. Electron microscopy approach to the wetting dynamics of single organosilanized mesopores. iScience 2023; 26:107981. [PMID: 37860771 PMCID: PMC10583112 DOI: 10.1016/j.isci.2023.107981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 09/08/2023] [Accepted: 09/16/2023] [Indexed: 10/21/2023] Open
Abstract
Columnar mesoporous silicon (PSi) with hydrophobic vs. hydrophilic chemistries was chosen as a model for the local (pore-by-pore) study of water-pore interactions. Tomographic reconstructions provided a 3D view of the ramified pore structure. An in situ study of PSi wetting was conducted for categorized pore diameters by environmental scanning TEM. An appropriate setting of the contrast allows for the normalization of the gray scale in the images as a function of relative humidity (RH). This allows constructing an isotherm for each single pore and a subsequent averaging provides an isotherm for each pore size range. The isotherms systematically point to an initial adsorption through the formation of water adlayers, followed by a capillary filling process at higher RH. The local isotherms correlate with (global) gravimetric determination of wetting. Our results point at the validation of a technique for the study of aging and stability of single-pore nanoscale devices.
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Affiliation(s)
- C. Rodriguez
- Departamento de Física Aplicada, Centro de Microanálisis de Materiales and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Mecwins, Roda de Poniente 15, Tres Cantos, Madrid 28760, Spain
| | - V. Torres-Costa
- Departamento de Física Aplicada, Centro de Microanálisis de Materiales and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - A.M. Bittner
- CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain
- Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain
| | - S. Morin
- CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain
- Department of Chemistry, York University, 4700 Keele Street, Toronto M3J 1P3, Canada
| | - M. Cascajo Castresana
- CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain
- Tecnalia, 20009 Donostia-San Sebastián, Spain
| | - S. Chiriaev
- Mads Clausen Institute, University of Southern Denmark, 6400 Sønderborg, Denmark
| | - E. Modin
- CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain
| | - A. Chuvilin
- CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain
- Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain
| | - M. Manso Silván
- Departamento de Física Aplicada, Centro de Microanálisis de Materiales and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, 28049 Madrid, Spain
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Biswas R. Molecular dynamics simulations of water-ethanol droplet on silicon surface. CHEMICAL PRODUCT AND PROCESS MODELING 2023. [DOI: 10.1515/cppm-2022-0040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
Abstract
Abstract
Molecular dynamics simulations are used to explore the wetting behavior of a water-ethanol droplet on the silicon surface. The effect of ethanol concentration on the wettability of a water-ethanol droplet on the silicon surface was analysed by calculation of contact angle. At 30% ethanol concentrations, the water contact angle was 50.7°, while at 50% ethanol concentrations, it was 36°. The results showed that the contact angle of a droplet on a silicon surface decreases with increasing ethanol concentrations. The formation of hydrogen bonds (HBs) between water-water molecules was 677 for the 30% ethanol system, while at 50% ethanol concentrations, it was 141. The number of hydrogen bonds between water molecules reduces as the ethanol concentrations rise. The HBs between water molecules and the silicon surface is seen to grow as the ethanol concentration rises. The overall potential energies of pure water, 7:3 water-ethanol, and 1:1 water-ethanol systems are −74.4, −96.16, and −158.59 kcal/mol, respectively. The contact angle and number density of water molecules on the surface of the silicon revealed that at different ethanol concentrations, more water molecules are distributed on the silicon surface.
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Affiliation(s)
- Rima Biswas
- Process Simulation Research Group, School of Chemical Engineering , Vellore Institute of Technology , 632014 Vellore , Tamil Nadu , India
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Surface characterization of alkane viral anchoring films prepared by titanate-assisted organosilanization. Colloids Surf B Biointerfaces 2023; 222:113136. [PMID: 36641873 DOI: 10.1016/j.colsurfb.2023.113136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 12/26/2022] [Accepted: 01/06/2023] [Indexed: 01/12/2023]
Abstract
Studies of virus adsorption on surfaces with optimized properties have attracted a lot of interest, mainly due to the influence of the surface in the retention, orientation and stability of the viral capsids. Besides, viruses in whole or in parts can be used as cages or vectors in different areas, such as biomedicine and materials science. A key requirement for virus nanocage application is their physical properties, i.e. their mechanical response and the distribution of surface charge, which determine virus-substrate interactions and stability. In the present work we show two examples of viruses exhibiting strong surface interactions on homogeneous hydrophobic surfaces. The surfaces were prepared by titanate assisted organosilanization, a sol-gel spin coating process, followed by a mild annealing step. We show by surface and interface spectroscopies that the process allows trapping triethoxy-octylsilane (OCTS) molecules, exhibiting a hydrophobic alkane rich surface finishing. Furthermore, the surfaces remain flat and behave as more efficient sorptive surfaces for virus particles than mica or graphite (HOPG). Also, we determine by atomic force microscopy (AFM) the mechanical properties of two types of viruses (human adenovirus and reovirus) and compare the results obtained on the OCTS functionalized surfaces with those obtained on mica and HOPG. Finally, the TIPT+OCTS surfaces were validated as platforms for the morphological and mechanical characterization of virus particles by using adenovirus as initial model and using HOPG and mica as standard control surfaces. Then, the same characteristics were determined on reovirus using TIPT+OCTS and HOPG, as an original contribution to the catalogue of physical properties of viral particles.
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Xiang YC, Martínez-Martínez RM, Torres-Costa V, Agulló-Rueda F, García-Ruiz JP, Manso-Silván M. Direct laser writing of nanorough cell microbarriers on anatase/Si and graphite/Si. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 66:8-15. [PMID: 27207033 DOI: 10.1016/j.msec.2016.04.059] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 03/22/2016] [Accepted: 04/14/2016] [Indexed: 01/09/2023]
Abstract
The formation of hierarchical structures consisting of microstripe barriers decorated with nanorough ablated materials prepared by direct laser writing is described. Linear features of circa 25μm width and 12μm height are achieved on amorphous and crystalline titania and graphitic carbon films deposited on silicon. Ablated protrusions build up barriers decorated by nanoscale Si-film reconstructions, as indicated by EDX maps and micro-Raman spectroscopy. Wettability tests show a dramatic change in water contact angle, which leads to almost full wetting after irradiation, irrespective of the original film composition. Fluorescence microscopy images of human mesenchymal stem cells cultured on 1D and 2D structures demonstrate the short term biocompatibility of the ablated surfaces. It is shown that cells adhere, extend and polarize on feature edges, independently of the type of surface, thus suggesting that the created nanoroughness is at the origin of the antifouling behavior. In particular, irradiated anatase and graphite surfaces demonstrate an increased performance of crystalline films for the creation of cell guiding and trapping devices. The results suggest that such laser processing of films may serve as a time-and-cost-efficient method for the design of few-cells analytical surfaces.
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Affiliation(s)
- Y C Xiang
- Departamento de Física Aplicada and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, Madrid, Spain; Department of Physics, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2BW, UK
| | - R M Martínez-Martínez
- Departamento de Física Aplicada and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, Madrid, Spain
| | - V Torres-Costa
- Departamento de Física Aplicada and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, Madrid, Spain; Centro de Microanálisis de Materiales, Universidad Autónoma de Madrid, Madrid, Spain
| | - F Agulló-Rueda
- Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), 28049 Madrid, Spain
| | - J P García-Ruiz
- Departamento de Biología Molecular, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - M Manso-Silván
- Departamento de Física Aplicada and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, Madrid, Spain.
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Li Y, Duan C. Bubble-Regulated Silicon Nanowire Synthesis on Micro-Structured Surfaces by Metal-Assisted Chemical Etching. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:12291-12299. [PMID: 26411775 DOI: 10.1021/acs.langmuir.5b03056] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this work, we study silicon nanowire synthesis via one-step metal-assisted chemical etching (MACE) on microstructured silicon surfaces with periodic pillar/cavity array. It is found that hydrogen gas produced from the initial anodic reaction can be trapped inside cavities and between pillars, which serves as a mask to prevent local etching, and leads to the formation of patterned vertically aligned nanowire array. A simple model is presented to demonstrate that such bubble entrapment is due to the significant adhesion energy barrier, which is a function of pillar/cavity geometry, contact angle, and nanowire length to be etched. The bubble entrapment can be efficiently removed when extra energy is introduced by sonication to overcome this energy barrier, resulting in nanowire growth in all exposed surfaces. This bubble-regulated MACE process on microstructured surfaces can be used to fabricate nanowire arrays with desired morphologies.
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Affiliation(s)
- Yinxiao Li
- Department of Mechanical Engineering, Boston University , Boston, Massachusetts 02215, United States
| | - Chuanhua Duan
- Department of Mechanical Engineering, Boston University , Boston, Massachusetts 02215, United States
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Gallach Pérez D, Punzón Quijorna E, Sanz R, Torres-Costa V, García Ruiz JP, Manso Silván M. Nanotopography enhanced mobility determines mesenchymal stem cell distribution on micropatterned semiconductors bearing nanorough areas. Colloids Surf B Biointerfaces 2014; 126:146-53. [PMID: 25546837 DOI: 10.1016/j.colsurfb.2014.11.047] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Revised: 11/27/2014] [Accepted: 11/30/2014] [Indexed: 11/17/2022]
Abstract
Surface micropatterns are relevant instruments for the in vitro analysis of cell cultures in non-conventional planar conditions. In this work, two semiconductors (Si and TiO2) have been micropatterned by combined ion-beam/chemical-etching processes leading to selective areas bearing nanorough features. A preferential affinity of human mesenchymal stem cells (hMSCs) for planar areas versus nanotopographic ones is observed. Fluorescence microscopy after β-catenin staining suggests that hMSCs adhesion is inhibited on nanostructured porous silicon areas. This has a direct impact in the development of actin fibers and suggests different cell migration mechanisms on the materials of a micropattern. hMSCs organization on nanotopographic micropatterns has been modeled by using a simplified random walk approach. The model attributes preferential cell mobilities on the nanotopographic areas with respect to the planar and considers purely stochastic movement with no inertial term. Simulations of the cell distribution have been run on 1D and 2D micropatterns and compared with the real hMSC cultures. The simulations allow defining two regimes for cell organization as a function of cell density. hMSCs ordering on planar areas is diffusion-induced in most micropatterns but constriction forced disorder appears for high cell densities. The relative mobility on the planar versus nanotopographic areas can be used as a quality indicator of the nanotopography contrasts in the diffusion induced ordering regime. It is shown that the relative mobility is favorable for the TiO2 versus the Si based system, and allows envisaging its use for the calibrated design of nanotopography based micropatterned materials.
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Affiliation(s)
- Darío Gallach Pérez
- Departamento de Física Aplicada, Universidad Autónoma de Madrid, 28049 Madrid, Spain; Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Esther Punzón Quijorna
- Departamento de Física Aplicada, Universidad Autónoma de Madrid, 28049 Madrid, Spain; Centro de Microanálisis de Materiales, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Ruy Sanz
- CNR-IMM, Università di Catania, Via Santa Sofia 64, 95123 Catania, Italy
| | - Vicente Torres-Costa
- Departamento de Física Aplicada, Universidad Autónoma de Madrid, 28049 Madrid, Spain; Centro de Microanálisis de Materiales, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Josefa P García Ruiz
- Departamento de Biología Molecular, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Miguel Manso Silván
- Departamento de Física Aplicada, Universidad Autónoma de Madrid, 28049 Madrid, Spain; Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
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Naveas N, Hernandez-Montelongo J, Pulido R, Torres-Costa V, Villanueva-Guerrero R, García Ruiz JP, Manso-Silván M. Fabrication and characterization of a chemically oxidized-nanostructured porous silicon based biosensor implementing orienting protein A. Colloids Surf B Biointerfaces 2014; 115:310-6. [DOI: 10.1016/j.colsurfb.2013.11.026] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Revised: 11/13/2013] [Accepted: 11/14/2013] [Indexed: 11/26/2022]
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The anisotropic characteristics of natural fibrous sepiolite as revealed by contact angle, surface free energy, AFM and molecular dynamics simulation. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.04.018] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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