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Gao Y, Ge K, Zhang Z, Li Z, Hu S, Ji H, Li M, Feng H. Fine Optimization of Colloidal Photonic Crystal Structural Color for Physically Unclonable Multiplex Encryption and Anti-Counterfeiting. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2305876. [PMID: 38576190 PMCID: PMC11132029 DOI: 10.1002/advs.202305876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2023] [Revised: 02/28/2024] [Indexed: 04/06/2024]
Abstract
Robust anti-counterfeiting techniques aim for easy identification while remaining difficult to forge, especially for high-value items such as currency and passports. However, many existing anti-counterfeiting techniques rely on deterministic processes, resulting in loopholes for duplication and counterfeiting. Therefore, achieving high-level encryption and easy authentication through conventional anti-counterfeiting techniques has remained a significant challenge. To address this, this work proposes a solution that combined fluorescence and structural colors, creating a physically unclonable multiplex encryption system (PUMES). In this study, the physicochemical properties of colloidal photonic inks are systematically adjusted to construct a comprehensive printing phase diagram, revealing the printable region. Furthermore, the brightness and color saturation of inkjet-printed colloidal photonic crystal structural colors are optimized by controlling the substrate's hydrophobicity, printed droplet volume, and the addition of noble metals. Finally, fluorescence is incorporated to build PUMES, including macroscopic fluorescence and structural color patterns, as well as microscopic physically unclonable fluorescence patterns. The PUMES with intrinsic randomness and high encoding capacity are authenticated by a deep learning algorithm, which proved to be reliable and efficient under various observation conditions. This approach can provide easy identification and formidable resistance against counterfeiting, making it highly promising for the next-generation anti-counterfeiting of currency and passports.
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Affiliation(s)
- Yifan Gao
- Sauvage Laboratory for Smart MaterialsShenzhen Key Laboratory of Flexible Printed Electronics TechnologyHarbin Institute of Technology (Shenzhen)Shenzhen518000China
| | - Kongyu Ge
- Sauvage Laboratory for Smart MaterialsShenzhen Key Laboratory of Flexible Printed Electronics TechnologyHarbin Institute of Technology (Shenzhen)Shenzhen518000China
| | - Zhen Zhang
- Sauvage Laboratory for Smart MaterialsShenzhen Key Laboratory of Flexible Printed Electronics TechnologyHarbin Institute of Technology (Shenzhen)Shenzhen518000China
| | - Zhan Li
- Sauvage Laboratory for Smart MaterialsShenzhen Key Laboratory of Flexible Printed Electronics TechnologyHarbin Institute of Technology (Shenzhen)Shenzhen518000China
| | - Shaowei Hu
- State Key Laboratory of Advanced Welding and Joining (Shenzhen)Harbin Institute of Technology (Shenzhen)Shenzhen518000China
| | - Hongjun Ji
- State Key Laboratory of Advanced Welding and Joining (Shenzhen)Harbin Institute of Technology (Shenzhen)Shenzhen518000China
| | - Mingyu Li
- State Key Laboratory of Advanced Welding and Joining (Shenzhen)Harbin Institute of Technology (Shenzhen)Shenzhen518000China
| | - Huanhuan Feng
- Sauvage Laboratory for Smart MaterialsShenzhen Key Laboratory of Flexible Printed Electronics TechnologyHarbin Institute of Technology (Shenzhen)Shenzhen518000China
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Dattani UA, Karmakar S, Chaudhuri P. Athermal quasistatic cavitation in amorphous solids: Effect of random pinning. J Chem Phys 2023; 159:204501. [PMID: 38010327 DOI: 10.1063/5.0171905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 10/19/2023] [Indexed: 11/29/2023] Open
Abstract
Amorphous solids are known to fail catastrophically via fracture, and cavitation at nano-metric scales is known to play a significant role in such a failure process. Micro-alloying via inclusions is often used as a means to increase the fracture toughness of amorphous solids. Modeling such inclusions as randomly pinned particles that only move affinely and do not participate in plastic relaxations, we study how the pinning influences the process of cavitation-driven fracture in an amorphous solid. Using extensive numerical simulations and probing in the athermal quasistatic limit, we show that just by pinning a very small fraction of particles, the tensile strength is increased, and also the cavitation is delayed. Furthermore, the cavitation that is expected to be spatially heterogeneous becomes spatially homogeneous by forming a large number of small cavities instead of a dominant cavity. The observed behavior is rationalized in terms of screening of plastic activity via the pinning centers, characterized by a screening length extracted from the plastic-eigenmodes.
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Affiliation(s)
- Umang A Dattani
- The Institute of Mathematical Sciences, C.I.T. Campus, Taramani, Chennai 600113, India
- Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India
| | - Smarajit Karmakar
- Tata Institute of Fundamental Research, 36/P, Gopanpally Village, Serilingampally Mandal, Ranga Reddy District, Hyderabad 500046, Telangana, India
| | - Pinaki Chaudhuri
- The Institute of Mathematical Sciences, C.I.T. Campus, Taramani, Chennai 600113, India
- Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India
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3
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Das R, Bhowmik BP, Puthirath AB, Narayanan TN, Karmakar S. Soft pinning: Experimental validation of static correlations in supercooled molecular glass-forming liquids. PNAS NEXUS 2023; 2:pgad277. [PMID: 37680690 PMCID: PMC10482383 DOI: 10.1093/pnasnexus/pgad277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Accepted: 08/14/2023] [Indexed: 09/09/2023]
Abstract
Enormous enhancement in the viscosity of a liquid near its glass transition is a hallmark of glass transition. Within a class of theoretical frameworks, it is connected to growing many-body static correlations near the transition, often called "amorphous ordering." At the same time, some theories do not invoke the existence of such a static length scale in the problem. Thus, proving the existence and possible estimation of the static length scales of amorphous order in different glass-forming liquids is very important to validate or falsify the predictions of these theories and unravel the true physics of glass formation. Experiments on molecular glass-forming liquids become pivotal in this scenario as the viscosity grows several folds (∼ 10 14 ), and simulations or colloidal glass experiments fail to access these required long-time scales. Here we design an experiment to extract the static length scales in molecular liquids using dilute amounts of another large molecule as a pinning site. Results from dielectric relaxation experiments on supercooled Glycerol with different pinning concentrations of Sorbitol and Glucose, as well as the simulations on a few model glass-forming liquids with pinning sites, indicate the versatility of the proposed method, opening possible new avenues to study the physics of glass transition in other molecular liquids.
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Affiliation(s)
- Rajsekhar Das
- Department of Chemistry, University of Texas at Austin, Austin, TX 78712, USA
- TIFR Center for Interdisciplinary Science, Tata Institute of Fundamental Research, Hyderabad 500046, India
| | - Bhanu Prasad Bhowmik
- TIFR Center for Interdisciplinary Science, Tata Institute of Fundamental Research, Hyderabad 500046, India
- Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Anand B Puthirath
- TIFR Center for Interdisciplinary Science, Tata Institute of Fundamental Research, Hyderabad 500046, India
- Department of Materials Science and NanoEngineering, Rice University, 6100 Main Street, Houston, TX 77005, USA
| | - Tharangattu N Narayanan
- TIFR Center for Interdisciplinary Science, Tata Institute of Fundamental Research, Hyderabad 500046, India
| | - Smarajit Karmakar
- TIFR Center for Interdisciplinary Science, Tata Institute of Fundamental Research, Hyderabad 500046, India
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Tian L, Bechinger C. Surface melting of a colloidal glass. Nat Commun 2022; 13:6605. [PMID: 36329020 PMCID: PMC9633806 DOI: 10.1038/s41467-022-34317-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 10/18/2022] [Indexed: 11/06/2022] Open
Abstract
Despite their technological relevance, a full microscopic understanding of glasses is still lacking. This applies even more to their surfaces whose properties largely differ from that of the bulk material. Here, we experimentally investigate the surface of a two-dimensional glass as a function of the effective temperature. To yield a free surface, we use an attractive colloidal suspension of micron-sized particles interacting via tunable critical Casimir forces. Similar to crystals, we observe surface melting of the glass, i.e., the formation of a liquid film at the surface well below the glass temperature. Underneath, however, we find an unexpected region with bulk density but much faster particle dynamics. It results from connected clusters of highly mobile particles which are formed near the surface and deeply percolate into the underlying material. Because its thickness can reach several tens of particle diameters, this layer may elucidate the poorly understood properties of thin glassy films which find use in many technical applications.
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Affiliation(s)
- Li Tian
- Fachbereich Physik, Universität Konstanz, 78464, Konstanz, Germany
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Ganapathi D, Sood AK, Ganapathy R. Structural origin of excitations in a colloidal glass-former. J Chem Phys 2022; 156:214502. [DOI: 10.1063/5.0088500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Despite decades of intense research, whether the transformation of supercooled liquids into glass is a kinetic phenomenon or a thermodynamic phase transition remains unknown. Here, we analyzed optical microscopy experiments on 2D binary colloidal glass-forming liquids and investigated the structural links of a prominent kinetic theory of glass transition. We examined a possible structural origin for localized excitations, which are building blocks of the dynamical facilitation theory—a purely kinetic approach for the glass transition. To accomplish this, we utilize machine learning methods to identify a structural order parameter termed “softness” that has been found to be correlated with reorganization events in supercooled liquids. Both excitations and softness qualitatively capture the dynamical slowdown on approaching the glass transition and motivated us to explore spatial and temporal correlations between them. Our results show that excitations predominantly occur in regions with high softness and the appearance of these high softness regions precedes excitations, thus suggesting a causal connection between them. Thus, unifying dynamical and thermodynamical theories into a single structure-based framework may provide a route to understand the glass transition.
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Affiliation(s)
- Divya Ganapathi
- Department of Physics, Indian Institute of Science, Bangalore 560012, India
| | - A. K. Sood
- Department of Physics, Indian Institute of Science, Bangalore 560012, India
- International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India
| | - Rajesh Ganapathy
- International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India
- School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India
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Guiselin B, Tarjus G, Berthier L. Static self-induced heterogeneity in glass-forming liquids: Overlap as a microscope. J Chem Phys 2022; 156:194503. [PMID: 35597648 DOI: 10.1063/5.0086517] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We propose and numerically implement a local probe of the static self-induced heterogeneity characterizing glass-forming liquids. This method relies on the equilibrium statistics of the overlap between pairs of configurations measured in mesoscopic cavities with unconstrained boundaries. By systematically changing the location of the probed cavity, we directly detect spatial variations of the overlap fluctuations. We provide a detailed analysis of the statistics of a local estimate of the configurational entropy, and we infer an estimate of the surface tension between amorphous states, ingredients that are both at the basis of the random first-order transition theory of glass formation. Our results represent the first direct attempt to visualize and quantify the self-induced heterogeneity underpinning the thermodynamics of glass formation. They pave the way for the development of coarse-grained effective theories and for a direct assessment of the role of thermodynamics in the activated dynamics of deeply supercooled liquids.
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Affiliation(s)
- Benjamin Guiselin
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, 34095 Montpellier, France
| | - Gilles Tarjus
- LPTMC, CNRS-UMR 7600, Sorbonne Université, 4 Pl. Jussieu, F-75005 Paris, France
| | - Ludovic Berthier
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, 34095 Montpellier, France
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Cho HW, Mugnai ML, Kirkpatrick TR, Thirumalai D. Fragile-to-strong crossover, growing length scales, and dynamic heterogeneity in Wigner glasses. Phys Rev E 2020; 101:032605. [PMID: 32290023 DOI: 10.1103/physreve.101.032605] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 02/26/2020] [Indexed: 06/11/2023]
Abstract
Colloidal particles, which are ubiquitous, have become ideal testing grounds for the structural glass transition theories. In these systems glassy behavior arises as the density of the particles is increased. Thus, soft colloidal particles with varying degree of softness capture diverse glass-forming properties, observed normally in molecular glasses. Brownian dynamics simulations for a binary mixture of micron-sized charged colloidal suspensions show that tuning the softness of the interaction potential, achievable by changing the monovalent salt concentration results in a continuous transition from fragile to strong behavior. Remarkably, this is found in a system where the well characterized interaction potential between the colloidal particles is isotropic. We also show that the predictions of the random first-order transition (RFOT) theory quantitatively describes the universal features such as the growing correlation length, ξ∼(ϕ_{K}/ϕ-1)^{-ν} with ν=2/3 where ϕ_{K}, the analog of the Kauzmann temperature, depends on the salt concentration. As anticipated by the RFOT predictions, we establish a causal relationship between the growing correlation length and a steep increase in the relaxation time and dynamic heterogeneity as the system is compressed. The broad range of fragility observed in Wigner glasses is used to draw analogies with molecular and polymer glasses. The large variations in the fragility are normally found only when the temperature dependence of the viscosity is examined for a large class of diverse glass-forming materials. In sharp contrast, this is vividly illustrated in a single system that can be experimentally probed. Our work also shows that the RFOT predictions are accurate in describing the dynamics over the entire density range, regardless of the fragility of the glasses.
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Affiliation(s)
- Hyun Woo Cho
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, USA
| | - Mauro L Mugnai
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, USA
| | - T R Kirkpatrick
- Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA
| | - D Thirumalai
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, USA
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Bhowmik BP, Chaudhuri P, Karmakar S. Effect of Pinning on the Yielding Transition of Amorphous Solids. PHYSICAL REVIEW LETTERS 2019; 123:185501. [PMID: 31763889 DOI: 10.1103/physrevlett.123.185501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2018] [Indexed: 06/10/2023]
Abstract
Using numerical simulations, we have studied the yielding response, in the athermal quasistatic limit, of a model amorphous material having inclusions in the form of randomly pinned particles. We show that, with increasing pinning concentration, the plastic activity becomes more spatially localized, resulting in smaller stress drops, and a corresponding increase in the magnitude of strain where yielding occurs. We demonstrate that, unlike the spatially heterogeneous and avalanche led yielding in the case of the unpinned glass, for the case of large pinning concentration, yielding takes place via a spatially homogeneous proliferation of localized events.
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Affiliation(s)
- Bhanu Prasad Bhowmik
- Tata Institute of Fundamental Research, 36/P, Gopanpally Village, Serilingampally Mandal, Ranga Reddy District, Hyderabad, 500107, Telangana, India
| | - Pinaki Chaudhuri
- Institute of Mathematical Sciences, IV Cross Road, CIT Campus, Taramani, Chennai, 600113, Tamil Nadu, India
| | - Smarajit Karmakar
- Tata Institute of Fundamental Research, 36/P, Gopanpally Village, Serilingampally Mandal, Ranga Reddy District, Hyderabad, 500107, Telangana, India
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9
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Ozawa M, Scalliet C, Ninarello A, Berthier L. Does the Adam-Gibbs relation hold in simulated supercooled liquids? J Chem Phys 2019; 151:084504. [DOI: 10.1063/1.5113477] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Affiliation(s)
- Misaki Ozawa
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, Montpellier, France
| | - Camille Scalliet
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, Montpellier, France
| | | | - Ludovic Berthier
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, Montpellier, France
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10
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Balbuena C, Gianetti MM, Soulé ER. Static and dynamic correlation lengths in supercooled polymers. J Chem Phys 2019; 150:234508. [PMID: 31228894 DOI: 10.1063/1.5091682] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A key point to understand the glass transition is the relationship between structural and dynamic behavior experienced by a glass former when it approaches Tg. In this work, the relaxation in a simple bead-spring polymer system in the supercooled regime near its glass transition temperature was investigated with molecular dynamic simulations. We develop a new manner to look at the dynamic length scales in a supercooled polymeric system, focusing on correlated motion of particles in an isoconfigurational ensemble (that is, associated with the structure), as measured by Pearson's correlation coefficient. We found that while the usual dynamic four-point correlation length deviates from the structural (mosaic or point-to-set) length scale at low temperatures, Pearson's length behaves similarly to the static length in the whole temperature range. The results lead to a consensus of similar scaling of structural and dynamical length scales, reinforcing the idea of the theories of Adam-Gibbs and random first order transition.
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Affiliation(s)
- Cristian Balbuena
- Institute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), J. B. Justo 4302, 7600 Mar del Plata, Argentina
| | - Melisa M Gianetti
- Institute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), J. B. Justo 4302, 7600 Mar del Plata, Argentina
| | - Ezequiel R Soulé
- Institute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), J. B. Justo 4302, 7600 Mar del Plata, Argentina
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Balbuena C, Gianetti MM, Soulé ER. Looking at the dynamical heterogeneity in a supercooled polymer system through isoconfigurational ensemble. J Chem Phys 2018; 149:094506. [DOI: 10.1063/1.5039644] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Cristian Balbuena
- Institute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), J. B. Justo 4302, 7600 Mar del Plata, Argentina
| | - Melisa M. Gianetti
- Institute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), J. B. Justo 4302, 7600 Mar del Plata, Argentina
| | - Ezequiel R. Soulé
- Institute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), J. B. Justo 4302, 7600 Mar del Plata, Argentina
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