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Pham QN, Barako MT, Won Y. Grain Crystallinity, Anisotropy, and Boundaries Govern Microscale Hydrodynamic Transport in Semicrystalline Porous Media. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:39-51. [PMID: 38047529 DOI: 10.1021/acs.langmuir.3c01276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
Polycrystallinity is often an unintended consequence of real manufacturing processes used to produce designer porous media with deterministic and periodic architectures. Porous media are widely employed as high-surface conduits for fluid transport; unfortunately, even small concentrations of defects in the long-range order become the dominant impediment to hydrodynamic transport. In this study, we isolate the effects of these defects using a microfluidic analogy to energy transport in atomic polycrystals by directly tracking capillary transport through polycrystalline inverse opals. We reveal─using high-fidelity florescent microscopy─the boundary-limited nature of flow motions, along with nonlinear impedance elements introduced by the presence of "grain boundaries" that are separating the well-ordered "crystalline grains". Coupled crystallinity, anisotropy, and linear defect density contribute to direction-dominated flow characteristics in a discretized manner rather than traditional diffusive-like flow patterns. Separating individual crystal grains' transport properties from polycrystals along with new probabilistic data sets enables demonstrating statistical predictive models. These results provide fundamental insight into transport phenomena in (poly)crystalline porous media beyond the deterministic properties of an idealized unit cell and bridge the gap between engineering models and the ubiquitous imperfections found in manufactured porous materials.
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Affiliation(s)
- Quang N Pham
- Materials and Manufacturing Technology, University of California, Irvine, Irvine, California 92697, United States
| | - Michael T Barako
- NG Next Basic Research Laboratory, Northrop Grumman Corporation, Redondo Beach, California 90278, United States
| | - Yoonjin Won
- Materials and Manufacturing Technology, University of California, Irvine, Irvine, California 92697, United States
- Mechanical and Aerospace Engineering, University of California, Irvine, California 92697, United States
- Materials Science and Engineering, University of California, Irvine 92697, United States
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2
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Díaz-Marín CD, Li D, Vázquez-Cosme FJ, Pajovic S, Cha H, Song Y, Kilpatrick C, Vaartstra G, Wilson CT, Boriskina S, Wang EN. Capillary Transfer of Self-Assembled Colloidal Crystals. NANO LETTERS 2023; 23:1888-1896. [PMID: 36802577 DOI: 10.1021/acs.nanolett.2c04896] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Colloidal self-assembly has attracted significant interest in numerous applications including optics, electrochemistry, thermofluidics, and biomolecule templating. To meet the requirements of these applications, numerous fabrication methods have been developed. However, these are limited to narrow ranges of feature sizes, are incompatible with many substrates, and/or have low scalability, significantly limiting the use of colloidal self-assembly. In this work, we study the capillary transfer of colloidal crystals and demonstrate that this approach overcomes these limitations. Enabled by capillary transfer, we fabricate 2D colloidal crystals with nano-to-micro feature sizes spanning 2 orders of magnitude and on typically challenging substrates including those that are hydrophobic, rough, curved, or structured with microchannels. We developed and systemically validated a capillary peeling model, elucidating the underlying transfer physics. Due to its high versatility, good quality, and simplicity, this approach can expand the possibilities of colloidal self-assembly and enhance the performance of applications using colloidal crystals.
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Affiliation(s)
- Carlos D Díaz-Marín
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Diane Li
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Fernando J Vázquez-Cosme
- Departamento de Ingeniería Mecánica, Universidad de Puerto Rico─Mayagüez, Mayagüez, 00681, Puerto Rico
| | - Simo Pajovic
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Hyeongyun Cha
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Youngsup Song
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Cameron Kilpatrick
- Department of Mechanical Engineering, Stanford University, Stanford, California, 94305, United States
| | - Geoffrey Vaartstra
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Chad T Wilson
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Svetlana Boriskina
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Evelyn N Wang
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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3
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Winhard BF, Maragno LG, Gomez-Gomez A, Katz J, Furlan KP. Printing Crack-Free Microporous Structures by Combining Additive Manufacturing with Colloidal Assembly. SMALL METHODS 2023; 7:e2201183. [PMID: 36571286 DOI: 10.1002/smtd.202201183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 11/11/2022] [Indexed: 06/17/2023]
Abstract
To date high printing resolution and scalability, i.e., macroscale component dimensions and fast printing, are incompatible characteristics for additive manufacturing (AM) processes. It is hereby demonstrated that the combination of direct writing as an AM process with colloidal assembly enables the breaching of this processing barrier. By tailoring printing parameters for polystyrene (PS) microparticle-templates, how to avoid coffee ring formation is demonstrated, thus printing uniform single lines and macroscale areas. Moreover, a novel "comb"-strategy is introduced to print macroscale, crack-free colloidal coatings with low viscous colloidal suspensions. The printed templates are transformed into ceramic microporous channels as well as photonic coatings via atomic layer deposition (ALD) and calcination. The obtained structures reveal promising wicking capabilities and broadband reflection in the near-infrared, respectively. This work provides guidelines for printing low viscous colloidal suspensions and highlights the advancements that this printing process offers toward novel applications of colloidal-based printed structures.
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Affiliation(s)
- Benedikt F Winhard
- Hamburg University of Technology, Institute of Advanced Ceramics, Integrated Materials Systems Group, Denickestraße 15, 21073, Hamburg, Germany
| | - Laura G Maragno
- Hamburg University of Technology, Institute of Advanced Ceramics, Integrated Materials Systems Group, Denickestraße 15, 21073, Hamburg, Germany
| | - Alberto Gomez-Gomez
- Hamburg University of Technology, Institute of Advanced Ceramics, Integrated Materials Systems Group, Denickestraße 15, 21073, Hamburg, Germany
| | - Julian Katz
- Hamburg University of Technology, Institute of Advanced Ceramics, Integrated Materials Systems Group, Denickestraße 15, 21073, Hamburg, Germany
| | - Kaline P Furlan
- Hamburg University of Technology, Institute of Advanced Ceramics, Integrated Materials Systems Group, Denickestraße 15, 21073, Hamburg, Germany
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4
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Capillary spreading of ethanol-water on hierarchical nanowire surfaces with interconnected V-groove. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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5
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Lee J, Suh Y, Kuciej M, Simadiris P, Barako MT, Won Y. Computer vision-assisted investigation of boiling heat transfer on segmented nanowires with vertical wettability. NANOSCALE 2022; 14:13078-13089. [PMID: 36043910 DOI: 10.1039/d2nr02447k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The boiling efficacy is intrinsically tethered to trade-offs between the desire for bubble nucleation and necessity of vapor removal. The solution to these competing demands requires the separation of bubble activity and liquid delivery, often achieved through surface engineering. In this study, we independently engineer bubble nucleation and departure mechanisms through the design of heterogeneous and segmented nanowires with dual wettability with the aim of pushing the limit of structure-enhanced boiling heat transfer performances. The demonstration of separating liquid and vapor pathways outperforms state-of-the-art hierarchical nanowires, in particular, at low heat flux regimes while maintaining equal performances at high heat fluxes. A deep-learning based computer vision framework realized the autonomous curation and extraction of hidden big data along with digitalized bubbles. The combined efforts of materials design, deep learning techniques, and data-driven approach shed light on the mechanistic relationship between vapor/liquid pathways, bubble statistics, and phase change performance.
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Affiliation(s)
- Jonggyu Lee
- Department of Mechanical and Aerospace Engineering, University of California, Irvine, Irvine, CA, 92697, USA.
| | - Youngjoon Suh
- Department of Mechanical and Aerospace Engineering, University of California, Irvine, Irvine, CA, 92697, USA.
| | - Max Kuciej
- Department of Material Science and Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
- NG Next, Northrop Grumman Corporation, Redondo Beach, CA, 90278, USA
| | - Peter Simadiris
- Department of Mechanical and Aerospace Engineering, University of California, Irvine, Irvine, CA, 92697, USA.
| | - Michael T Barako
- NG Next, Northrop Grumman Corporation, Redondo Beach, CA, 90278, USA
| | - Yoonjin Won
- Department of Mechanical and Aerospace Engineering, University of California, Irvine, Irvine, CA, 92697, USA.
- Department of Electrical Engineering and Computer Science, University of California, Irvine, Irvine, CA, 92697, USA
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6
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Chun J, Xu C, Li Q, Chen Y, Zhao Q, Yang W, Wen R, Ma X. Microscopic Observation of Preferential Capillary Pumping in Hollow Nanowire Bundles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:352-362. [PMID: 34812042 DOI: 10.1021/acs.langmuir.1c02647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Numerous studies have focused on designing micro/nanostructured surfaces to improve wicking capability for rapid liquid transport in many industrial applications. Although hierarchical surfaces have been demonstrated to enhance wicking capability, the underlying mechanism of liquid transport remains elusive. Here, we report the preferential capillary pumping on hollow hierarchical surfaces with internal nanostructures, which are different from the conventional solid hierarchical surfaces with external nanostructures. Specifically, capillary pumping preferentially occurs in the nanowire bundles instead of the interconnected V-groove on hollow hierarchical surfaces, observed by confocal laser scanning fluorescence microscopy. Theoretical analysis shows that capillary pumping capability is mainly dependent on the nanowire diameter and results in 15.5 times higher capillary climbing velocity in the nanowire bundles than that in the microscale V-groove. Driven by the Laplace pressure difference between nanowire bundles and V-grooves, the preferential capillary pumping is increased with the reduction of the nanowire diameter. Capillary pumping of the nanowire bundles provides a preferential path for rapid liquid flow, leading to 2 times higher wicking capability of the hollow hierarchical surface comparing with the conventional hierarchical surface. The unique mechanism of preferential capillary pumping revealed in this work paves the way for wicking enhancement and provides an insight into the design of wicking surfaces for high-performance capillary evaporation in a broad range of applications.
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Affiliation(s)
- Jiang Chun
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory of Clean Utilization of Chemical Resources, Institute of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| | - Chen Xu
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory of Clean Utilization of Chemical Resources, Institute of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| | - Qifan Li
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory of Clean Utilization of Chemical Resources, Institute of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| | - Yansong Chen
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory of Clean Utilization of Chemical Resources, Institute of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| | - Qishan Zhao
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory of Clean Utilization of Chemical Resources, Institute of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| | - Wei Yang
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory of Clean Utilization of Chemical Resources, Institute of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| | - Rongfu Wen
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory of Clean Utilization of Chemical Resources, Institute of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| | - Xuehu Ma
- State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory of Clean Utilization of Chemical Resources, Institute of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
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7
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Martínez A, Apip C, Meléndrez MF, Domínguez M, Sánchez-Sanhueza G, Marzialetti T, Catalán A. Dual antifungal activity against Candida albicans of copper metallic nanostructures and hierarchical copper oxide marigold-like nanostructures grown in situ in the culture medium. J Appl Microbiol 2020; 130:1883-1892. [PMID: 32970915 DOI: 10.1111/jam.14859] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 08/21/2020] [Accepted: 09/14/2020] [Indexed: 01/03/2023]
Abstract
AIMS This study aimed to determine in vitro activity of copper nanoparticles and copper nanowires against Candida albicans strains and to assess their effects on morphology and submicron structure. METHODS AND RESULTS The microdilution method determined the minimal inhibitory concentration (MIC) of copper nanoparticles (CuNPs) and copper nanowires (CuNWs) against three strains of C. albicans: ATCC 10231 and two clinical strains (C and E). Effects on the morphology and ultrastructure of C. albicans strains were examined by scanning electron microscopy and transmission electron microscopy. MIC for CuNPs was 129·7 µg ml-1 for strain ATCC 10231, 1037·5 µg ml-1 for strain C and 518·8 µg ml-1 for strain E. MIC for CuNWs was similar for all strains tested (260·3 µg ml-1 ). SEM and TEM studies showed alterations in morphology, cell wall and the complete collapse of the yeast after incubation with CuNPs. In contrast, most of the yeast cells maintained their structure with an intact cell wall, and only decreased the number and size of fimbriae when C. albicans was exposed to CuNWs. CuNPs and CuNWs formed hierarchical copper oxide nanostructures growing in situ in the culture medium. Results suggest a dual mechanism for antifungal activity: (i) free Cu2+ ions act as a biocide, (ii) sharp edges of marigold-like petal nanostructures could injure the cellular wall and membrane and cause the death of the yeast. CONCLUSIONS CuNPs and CuNWs inhibited the growth of the three strains of C. albicans tested. Moreover, CuNPs disrupted cell wall with leakage of the cytoplasmic content. Each concentration of the series used for the determination of the activity of CuNPs and nanowires against C. albicans formed copper oxide marigold-like nanostructures. SIGNIFICANCE AND IMPACT OF THE STUDY This study suggests that CuNPs and CuNWs are good candidates for formulating new therapeutic agents for candidiasis.
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Affiliation(s)
- A Martínez
- Oral Prosthetic Rehabilitation Program, Department of Restorative School of Dentistry, University of Concepción, Concepción, Chile
| | - C Apip
- Oral Prosthetic Rehabilitation Program, Department of Restorative School of Dentistry, University of Concepción, Concepción, Chile
| | - M F Meléndrez
- Hybrid Material and Polymer Lab, Department of Materials Engineering, Faculty of Engineering, University of Concepción, Concepción, Chile
| | - M Domínguez
- Department of Microbiology, Faculty of Biological Science, University of Concepción, Concepción, Chile
| | - G Sánchez-Sanhueza
- Department of Restorative Dentistry, School of Dentistry, University of Concepción, Concepción, Chile
| | - T Marzialetti
- Department of Chemical Engineering, Faculty of Engineering, University of Concepción, Concepción, Chile
| | - A Catalán
- Removable Prosthetics, Department of Restorative Dentistry, School of Dentistry, University of Concepción, Concepción, Chile
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8
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Chen K, Xu RN, Jiang PX. Evaporation Enhancement of Microscale Droplet Impact on Micro/Nanostructured Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:12230-12236. [PMID: 33035425 DOI: 10.1021/acs.langmuir.0c01975] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The vicinity of the droplet three-phase contact line can be divided into four regions depending on the dominant forces and the liquid film thickness: the absorbed film region, the transition region, the intrinsic meniscus region, and the microconvection region, wherein the transition region has the largest evaporation rate for smaller thermal resistance and weaker intermolecular force between the liquid-vapor interface and the solid surface. On the basis of this perception, micro/nanostructured surfaces (ZnO nanowire surface (ZnO-NW) and copper inverse opal surface (CIO)) were fabricated to enhance the droplet evaporation rate. The precursor film, which can be regarded as the greatly enlarged transition region, was observed on the structured surfaces and promoted the droplet evaporation rate dramatically. The mechanisms of the formation and evolution of the precursor film were studied. Moreover, the second fast spreading of the droplet resulting from vigorous boiling on the structured surfaces enhanced the heat transfer between the droplet and the surface and also promoted the Leidenfrost temperature of the impact droplet.
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Affiliation(s)
- Kai Chen
- Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Key Laboratory for CO2 Utilization and Reduction Technology of Beijing, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
| | - Rui-Na Xu
- Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Key Laboratory for CO2 Utilization and Reduction Technology of Beijing, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
| | - Pei-Xue Jiang
- Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Key Laboratory for CO2 Utilization and Reduction Technology of Beijing, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
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9
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Pham QN, Zhang S, Hao S, Montazeri K, Lin CH, Lee J, Mohraz A, Won Y. Boiling Heat Transfer with a Well-Ordered Microporous Architecture. ACS APPLIED MATERIALS & INTERFACES 2020; 12:19174-19183. [PMID: 32239917 DOI: 10.1021/acsami.0c01113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Boiling heat transfer through a porous medium offers an attractive combination of enormous liquid-vapor interfacial area and high bubble nucleation site density. In this work, we characterize the boiling performances of porous media by employing the well-ordered and highly interconnected architecture of inverse opals (IOs). The boiling characterization identifies hydrodynamic mechanisms through which structural characteristics affect the boiling performance of metallic microporous architecture by validating empirical measurements. The boiling performances can be optimized through the rational design of both the structural thicknesses and pore diameters of IOs, which demonstrate up to 336% enhancement in boiling heat-transfer coefficient (HTC) over smooth surfaces. The optimal HTC and critical heat flux occur at approximately 3-4 μm in porous structure thickness, which is manifested through the balance of liquid-vapor occupation within the spatial confinement of the IO structure. The optimization of boiling performances with varying pore diameters (0.3-1.0 μm) can be attributed to the hydraulic competitions between permeability and viscous resistance to liquid-vapor transport. This study unveils thermophysical understandings to enhance multiphase heat transfer in microporous media for ultrahigh heat flux thermal management.
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Affiliation(s)
- Quang N Pham
- Department of Materials and Manufacturing Technology, University of California Irvine, Irvine, California 92697, United States
| | - Shiwei Zhang
- Department of Mechanical and Aerospace Engineering, University of California Irvine, Irvine, California 92697, United States
| | - Shuai Hao
- Department of Mechanical and Aerospace Engineering, University of California Irvine, Irvine, California 92697, United States
| | - Kimia Montazeri
- Department of Mechanical and Aerospace Engineering, University of California Irvine, Irvine, California 92697, United States
| | - Cheng-Hui Lin
- Department of Mechanical and Aerospace Engineering, University of California Irvine, Irvine, California 92697, United States
| | - Jonggyu Lee
- Department of Mechanical and Aerospace Engineering, University of California Irvine, Irvine, California 92697, United States
| | - Ali Mohraz
- Department of Chemical and Biomolecular Engineering, University of California Irvine, Irvine, California 92697, United States
| | - Yoonjin Won
- Department of Mechanical and Aerospace Engineering, University of California Irvine, Irvine, California 92697, United States
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10
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Zou L, Ge M, Zhao C, Meng Q, Wang H, Liu X, Lin CH, Xiao X, Lee WK, Shen Q, Chen F, Chen-Wiegart YCK. Designing Multiscale Porous Metal by Simple Dealloying with 3D Morphological Evolution Mechanism Revealed via X-ray Nano-tomography. ACS APPLIED MATERIALS & INTERFACES 2020; 12:2793-2804. [PMID: 31846299 DOI: 10.1021/acsami.9b16392] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Designing materials with multiscale, hierarchical structure is critical to drive the advancement of new technology. Specifically, porous metals with multiscale porosity from nanometer to micrometer sizes would lead to enhanced physical and chemical properties-the micron-sized pores can increase the effective diffusivity of ion transport within the porous media, and the nano-sized pores provide high specific surface area, enabling functionalities that are unique to nanoporous metals. A new ternary precursor alloy selection concept utilizing the different mixing enthalpies is demonstrated in this work for the design of multiscale, bimodal porous copper from a simple, one-step dealloying of Cu-Fe-Al ternary alloy. The nanoporosity in the bimodal porous structure is formed from dealloying of the Cu-rich phase, whereas the microporosity is controlled by dissolving the Fe-rich phase, determined by both the initial Fe particle size and sintering profile. In addition to advancing the materials design method, the multiscale pore formation during dealloying was directly visualized and quantified via an interrupted in situ synchrotron X-ray nano-tomography. The 3D morphological analysis on tortuosity showed that the presence of the microporosity can compensate the increase of the diffusion path length due to nanoporosity, which facilitates diffusion within the porous structure. Overall the focus of the work is to introduce a new strategy to design multiscale porous metals with enhanced transport properties, and sheds light on the fundamental mechanisms on the 3D morphological evolution of the system using advanced synchrotron X-ray nano-tomography for future materials development and applications.
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Affiliation(s)
- Lijie Zou
- State Key Lab of Advanced Technology for Materials Synthesis and Processing , Wuhan University of Technology , Wuhan 430070 , China
- Department of Materials Science and Chemical Engineering , Stony Brook University , Stony Brook , New York 11794 , United States
| | - Mingyuan Ge
- National Synchrotron Light Source - II , Brookhaven National Laboratory , Upton , New York 11973 , United States
| | - Chonghang Zhao
- Department of Materials Science and Chemical Engineering , Stony Brook University , Stony Brook , New York 11794 , United States
| | - Qingkun Meng
- Department of Materials Science and Chemical Engineering , Stony Brook University , Stony Brook , New York 11794 , United States
- School of Materials Science and Engineering , China University of Mining and Technology , Xuzhou 221116 , China
| | - Hao Wang
- State Key Lab of Advanced Technology for Materials Synthesis and Processing , Wuhan University of Technology , Wuhan 430070 , China
| | - Xiaoyang Liu
- Department of Materials Science and Chemical Engineering , Stony Brook University , Stony Brook , New York 11794 , United States
| | - Cheng-Hung Lin
- Department of Materials Science and Chemical Engineering , Stony Brook University , Stony Brook , New York 11794 , United States
| | - Xianghui Xiao
- National Synchrotron Light Source - II , Brookhaven National Laboratory , Upton , New York 11973 , United States
| | - Wah-Keat Lee
- National Synchrotron Light Source - II , Brookhaven National Laboratory , Upton , New York 11973 , United States
| | - Qiang Shen
- State Key Lab of Advanced Technology for Materials Synthesis and Processing , Wuhan University of Technology , Wuhan 430070 , China
| | - Fei Chen
- State Key Lab of Advanced Technology for Materials Synthesis and Processing , Wuhan University of Technology , Wuhan 430070 , China
| | - Yu-Chen Karen Chen-Wiegart
- Department of Materials Science and Chemical Engineering , Stony Brook University , Stony Brook , New York 11794 , United States
- National Synchrotron Light Source - II , Brookhaven National Laboratory , Upton , New York 11973 , United States
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11
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Michalak M, Roguska A, Nogala W, Opallo M. Patterning Cu nanostructures tailored for CO 2 reduction to electrooxidizable fuels and oxygen reduction in alkaline media. NANOSCALE ADVANCES 2019; 1:2645-2653. [PMID: 36132742 PMCID: PMC9416923 DOI: 10.1039/c9na00166b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Accepted: 05/16/2019] [Indexed: 05/16/2023]
Abstract
Due to the limited availability of noble metal catalysts, such as platinum, palladium, or gold, their substitution by more abundant elements is highly advisable. Considerably challenging is the controlled and reproducible synthesis of stable non-noble metallic nanostructures with accessible active sites. Here, we report a method of preparation of bare (ligand-free) Cu nanostructures from polycrystalline metal in a controlled manner. This procedure relies on heterogeneous localized electrorefining of polycrystalline Cu on indium tin oxide (ITO) and glassy carbon as model supports using scanning electrochemical microscopy (SECM). The morphology of nanostructures and thus their catalytic properties are tunable by adjusting the electrorefining parameters, i.e., the electrodeposition voltage, the translation rate of the metal source and the composition of the supporting electrolyte. The activity of the obtained materials towards the carbon dioxide reduction reaction (CO2RR), oxygen reduction reaction (ORR) in alkaline media and hydrogen evolution reaction (HER), is studied by feedback mode SECM. Spiky Cu nanostructures obtained at a high concentration of chloride ions exhibit enhanced electrocatalytic activity. Nanostructures deposited under high cathodic overpotentials possess a high surface-to-volume ratio with a large number of catalytic sites active towards the reversible CO2RR and ORR. The CO2RR yields easily electrooxidizable compounds - formic acid and carbon monoxide. The HER seems to occur efficiently at the crystallographic facets of Cu nanostructures electrodeposited under mild polarization.
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Affiliation(s)
- Magdalena Michalak
- Institute of Physical Chemistry, Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
| | - Agata Roguska
- Institute of Physical Chemistry, Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
| | - Wojciech Nogala
- Institute of Physical Chemistry, Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
| | - Marcin Opallo
- Institute of Physical Chemistry, Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
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12
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Lee J, Suh Y, Dubey PP, Barako MT, Won Y. Capillary Wicking in Hierarchically Textured Copper Nanowire Arrays. ACS APPLIED MATERIALS & INTERFACES 2019; 11:1546-1554. [PMID: 30557501 DOI: 10.1021/acsami.8b14955] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Capillary wicking through homogeneous porous media remains challenging to simultaneously optimize due to the unique transport phenomena that occur at different length scales. This challenge may be overcome by introducing hierarchical porous media, which combine tailored morphologies across multiple length scales to design for the individual transport mechanisms. Here, we fabricate hierarchical nanowire arrays consisting of vertically aligned copper nanowires (∼100 to 1000 nm length scale) decorated with dense copper oxide nanostructures (∼10 to 100 nm length scale) to create unique property sets that include a large specific surface area, high rates of fluid delivery, and the structural flexibility of vertical arrays. These hierarchical nanowire arrays possess enhanced capillary wicking ( K/ Reff = 0.004-0.023 μm) by utilizing hemispreading and are advantageous as evaporation surfaces. With the advent and acceleration of flexible electronics technologies, we measure the capillary properties of our freestanding hierarchical nanowire arrays installed on curved surfaces and observe comparable fluid delivery to flat arrays, showing the difference of 10-20%. The degree of effective inter-nanowire pore and porosity is shown to govern the capillary performance parameters, thereby this study provides the design strategy for capillary wicking materials with unique and tailored combinations of thermofluidic properties.
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Affiliation(s)
- Jonggyu Lee
- Department of Mechanical and Aerospace Engineering , University of California, Irvine , Irvine , California 92697 , United States
| | - Youngjoon Suh
- Department of Mechanical and Aerospace Engineering , University of California, Irvine , Irvine , California 92697 , United States
| | - Pranav P Dubey
- Department of Mechanical and Aerospace Engineering , University of California, Irvine , Irvine , California 92697 , United States
| | - Michael T Barako
- Department of Mechanical and Aerospace Engineering , University of California, Irvine , Irvine , California 92697 , United States
- NG Next, Northrop Grumman Corporation , Redondo Beach , California 90278 , United States
| | - Yoonjin Won
- Department of Mechanical and Aerospace Engineering , University of California, Irvine , Irvine , California 92697 , United States
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Zhang H, Huang X, Wang C, Peng Z, Xu Y, He X, Zhang C, Lu J. Nanocellulose-assisted construction of hydrophilic 3D hierarchical stereocomplex meshworks in enantiomeric polylactides: towards thermotolerant biocomposites with enhanced environmental degradation. CrystEngComm 2019. [DOI: 10.1039/c9ce01412h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A hydrophilic and hierarchical 3D stereocomplexed crystalline meshwork was in situ constructed in fully bio-derived enantiomeric polylactide/cellulose nanocrystal nanocomposites.
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Affiliation(s)
- Huanhuan Zhang
- Key Laboratory of Advanced Technologies of Materials
- Ministry of Education
- School of Materials Science and Engineering
- Southwest Jiaotong University
- Chengdu 610031
| | - Xi Huang
- Key Laboratory of Advanced Technologies of Materials
- Ministry of Education
- School of Materials Science and Engineering
- Southwest Jiaotong University
- Chengdu 610031
| | - Chuanfeng Wang
- Key Laboratory of Advanced Technologies of Materials
- Ministry of Education
- School of Materials Science and Engineering
- Southwest Jiaotong University
- Chengdu 610031
| | - Zhou Peng
- Key Laboratory of Advanced Technologies of Materials
- Ministry of Education
- School of Materials Science and Engineering
- Southwest Jiaotong University
- Chengdu 610031
| | - Yali Xu
- Key Laboratory of Advanced Technologies of Materials
- Ministry of Education
- School of Materials Science and Engineering
- Southwest Jiaotong University
- Chengdu 610031
| | - Xuebing He
- Key Laboratory of Advanced Technologies of Materials
- Ministry of Education
- School of Materials Science and Engineering
- Southwest Jiaotong University
- Chengdu 610031
| | - Chaoliang Zhang
- State Key Laboratory of Oral Diseases
- West China Hospital of Stomatology
- Sichuan University
- Chengdu 610041
- China
| | - Jun Lu
- Key Laboratory of Advanced Technologies of Materials
- Ministry of Education
- School of Materials Science and Engineering
- Southwest Jiaotong University
- Chengdu 610031
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Pham QN, Zhang S, Montazeri K, Won Y. Droplets on Slippery Lubricant-Infused Porous Surfaces: A Macroscale to Nanoscale Perspective. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:14439-14447. [PMID: 30372082 DOI: 10.1021/acs.langmuir.8b02765] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A recent design approach in creating super-repellent surfaces through slippery surface lubrication offers tremendous liquid-shedding capabilities. Previous investigations have provided significant insights into droplet-lubricant interfacial behaviors that govern antiwetting properties but have often studied using macroscale droplets. Despite drastically different governing characteristics of ultrasmall droplets on slippery lubricated surfaces, little is known about the effects at the micro- and nanoscale. In this investigation, we impregnate a three-dimensionally, well-ordered porous metal architecture with a lubricant to confirm durable slippery surfaces. We then reduce the droplet size to a nanoliter range and experimentally compare the droplet behaviors at different length scales. By experimentally varying the lubricant thickness levels, we also reveal that the effect of lubricant wetting around ultrasmall droplets is intensely magnified, which significantly affects the transient droplet dynamics. Molecular dynamics computations further examine the ultrasmall droplets with varying lubricant levels or pore cut levels at the nanoscale. The combined experimental and computational work provides insights into droplet interfacial phenomena on slippery surfaces from a macroscale to nanoscale perspective.
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