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Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...

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Sticking particles to solid surfaces using Moringa oleifera proteins as a glue.

Shirin Nouhi¹, Marc Pascual¹, Maja S Hellsing¹

¹Centre for Neutron Scattering, Uppsala University, Box 516, 751 20, Uppsala, Sweden.

Colloids and Surfaces. B, Biointerfaces

|January 27, 2018

Summary

Moringa oleifera seed proteins act as natural flocculating agents, promoting particle adhesion to surfaces. This discovery opens avenues for creating novel nanostructures and advanced materials like active filters.

Keywords:

Adhesion Latex particles Moringa oleifera Quartz Surface scattering

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Area of Science:

Biomaterials science
Nanotechnology
Surface chemistry

Background:

Novel, natural flocculating agents derived from Moringa oleifera seeds are explored.
Investigating the potential of these seed proteins for creating nanostructures.

Purpose of the Study:

To determine if Moringa oleifera seed proteins can promote adhesion at planar interfaces.
To explore the application of these proteins in fabricating nanostructures.

Main Methods:

Proteins exposed to silica interfaces, followed by exposure to sulfonated polystyrene latex dispersions.
Atomic force microscopy (AFM) for particle density and sticking probability.
Quartz crystal microbalance (QCM) for adhesion confirmation and coverage assessment.
Neutron reflectivity and scattering for binding analysis.

Main Results:

Proteins bind irreversibly to silica interfaces.
High sticking probability (close to 1) observed for particles.
Repeated exposures increase surface coverage.
Particles bind as a monolayer, confirmed by neutron experiments.

Conclusions:

Moringa oleifera 2S albumin seed protein effectively fixes particles at interfaces.
Potential applications in active filters and improved photonic device interfaces.