NanoGreen Knowledge Check

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Sufi Tarmizi

Malasia

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NanoGreen Knowledge Check


NanoGreen Knowledge CheckVersión en línea Choose the correct answer por Sufi Tarmizi 1 What is the role of polyphenols and flavonoids in green synthesis of AgNPs? a They act as oxidizing agents b They function as organic solvents c They act as reducing AND stabilizing agents d They only act as coloring agents 2 The golden-yellow colour of AgNP suspension is due to which optical phenomenon? a Chlorophyll absorption b Surface Plasmon Resonance c Protein fluorescence d Tyndall effect 3 Which pH range is optimal for green synthesis of Pandan-AgNPs? a pH 8–10 b Neutral pH 7 c pH 4–6 d pH 11–12 4 What happens if reaction temperature exceeds 100°C? a Capping agents are destroyed, leading to aggregation b Nanoparticles dissolve completely c Reaction stops due to lack of oxygen d Silver ions evaporate 5 What is the consequence of too high AgNO₃ concentration relative to extract volume? a Rapid precipitation without nucleation b Incomplete reduction due to insufficient reducing agents c Formation of gold nanoparticles instead d Excessive nanoparticle stabilization 6 In FTIR of Pandan-AgNPs, the peak at ~3400 cm⁻¹ is attributed to which functional group? a C=O stretch from aldehydes b N–H bend from amines c C–H stretch from alkanes d O–H stretch from polyphenols 7 A zeta potential of -32 mV indicates the nanoparticle suspension is: a Highly unstable, prone to precipitation b Neutral, with no surface charge c Stable due to strong electrostatic repulsion d Stable only at acidic pH 8 Which correctly describes an antimicrobial mechanism of AgNPs? a Disruption of bacterial cell membrane integrity b Increasing nutrient uptake efficiency c Enhancing bacterial photosynthesis d Promoting DNA replication in bacteria 9 Which is an advantage of green synthesis over conventional chemical synthesis? a Requires expensive catalysts b Produces toxic by-products c Uses renewable plant material without toxic reducing agents d Demands high energy input 10 Which sequence correctly describes the green synthesis workflow? a Reduction → Extraction → Characterisation → Nucleation b Characterisation → Reduction → Extraction → Nucleation c Extraction → Reduction → Nucleation → Characterisation d Nucleation → Extraction → Reduction → Characterisation

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NanoGreen Knowledge CheckVersión en línea

por Sufi Tarmizi

What is the role of polyphenols and flavonoids in green synthesis of AgNPs?

The golden-yellow colour of AgNP suspension is due to which optical phenomenon?

Which pH range is optimal for green synthesis of Pandan-AgNPs?

What happens if reaction temperature exceeds 100°C?

What is the consequence of too high AgNO₃ concentration relative to extract volume?

In FTIR of Pandan-AgNPs, the peak at ~3400 cm⁻¹ is attributed to which functional group?

A zeta potential of -32 mV indicates the nanoparticle suspension is:

Which correctly describes an antimicrobial mechanism of AgNPs?

Which is an advantage of green synthesis over conventional chemical synthesis?

Which sequence correctly describes the green synthesis workflow?