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Anionic layered materials overview and applications

Synthesis, properties, and applications of anionic layered materials in sustainable technology

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Anionic layered materials
Assembly, synthesis, reactivity, and applications
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Anionic layered materials
Assembly, synthesis, reactivity, and applications
Anionic layered materials overview and applications1 / 12
Executive summary
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    ALMs are 2D crystalline solids with anion-exchange and intercalation capabilities
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    Layered double hydroxides (LDHs) and hydroxy double salts (HDSs) are key examples
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    Synthesis methods include conventional and novel approaches like template-assisted and mechano-chemical
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    Applications span water remediation, biomedicine, ceramics, and display technologies
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    Advanced techniques like PXRD and FTIR validate structural and functional properties
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Understanding anionic layered materials
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Classification of layered materials
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    Class I: Atomic monolayers (e.g., graphite, boron nitride)
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    Class II: Few-atom-thick layers (e.g., layered dichalcogenides, FeOCl)
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    Class III: Many-atom-thick layers (e.g., silicate clays, metal phosphates)
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    Cationic: Negatively charged layers (e.g., clays, metal phosphates)
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    Neutral: No layer charge (e.g., graphite, magnesium hydroxide)
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    Anionic: Positively charged layers (e.g., LDHs, LHSs)
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Key structural features of ALMs
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    Anion-exchange capacity enables tuning of interlayer composition
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    Intercalation of complex guest species for functionalization
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    Basal spacing (d) and gallery height define interlayer distance
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    Anisotropic bonding leads to swelling, colloidal stability, and monolayer formation
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Synthesis and characterization
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Synthesis methodologies
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    Conventional: Co-precipitation, hydrothermal, sol-gel
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    Novel: Template-assisted, mechano-chemical, microwave-assisted
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    Goal: Enhance physical, chemical, optical, and catalytic properties
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    Topotactic transformations preserve layered structure during reactions
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Characterization techniques
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Schematic of PXRD, FTIR, and electron microscopy setups analyzing layered structures
Schematic of PXRD, FTIR, and electron microscopy setups analyzing layered structures
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    Powder X-ray diffraction (PXRD) confirms layered frameworks
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    Fourier-transform infrared spectroscopy (FTIR) identifies functional groups
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    Electron microscopy visualizes morphology and intercalation
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Applications of ALMs
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Diverse application paradigms
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    Water remediation: Anion exchange for pollutant removal
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    Ceramics: Thermal stability and mechanical strength
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    Catalysis: High surface area for chemical reactions
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    Biomedicine: Drug delivery and antimicrobial agents
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    Biosensing: Detection platforms for biomolecules
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    Display technologies: Optical properties for screens
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“
ALMs hold immense promise for sustainable technology and advanced functional materials
Pathak et al., Advances in Colloid and Interface Science, 2026
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Key takeaways and references
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ALMs offer tunable chemistry and broad applicability • Synthesis and characterization are critical for performance • Applications range from environmental to high-tech industries • References: Pathak et al. (2026), Advances in Colloid and Interface Science

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