Primary studyCore evidenceTransport Physics

NH2-UiO-66 Metal-Organic Framework Nanoparticles for Hydroxide Ion Conductive Photoswitches

Wang S., Fan S., Fang Z. et al. · ACS Applied Nano Materials · 2021 · 8352-8359

2materials
12samples
9synthesis routes
25measurements
58results
6claims and caveats

Evidence map

Open a family to keep every result attached to its sample, method and conditions.

Author interpretations and caveats

Paraphrased for this database from the authors’ stated interpretations — never quoted verbatim — and kept separate from reported measurements.

Phase AssignmentSupport assessment: High

The modulated NH2-UiO-66 nanoparticle series forms UiO-66-type NH2-UiO-66, with crystallinity improving as acetic-acid/ZrCl4 ratio increases.

Caveat: Additional XRD patterns in the SI were checked visually.

p002 · Result and Discussion · Figure 1 · Linked to 4 structured results

Phase AssignmentSupport assessment: Medium

NH2-UiO-66-OH samples retain framework XRD features after KOH immersion and photoswitch conductivity testing, supporting chemical/structural stability during the experiment.

Caveat: The comparison is qualitative from SI XRD traces; no refinement or quantified crystallinity retention is reported.

p004 · Additional figures · Figure S3 · Linked to 1 structured result

Structure Property LinkSupport assessment: High

NH2-UiO-66-10-OH gives the best balance of hydroxide conductivity and reversible photoswitching, with an on/off ratio of 99.6 at 55 deg C and 95% RH.

Caveat: Some comparison conductivities for other modulator ratios are estimated from figures because raw data are not tabulated.

p005 · Results · Figures 4 and 5 · Linked to 3 structured results

Structure Property LinkSupport assessment: Medium

High relative humidity is required to form a continuous water-mediated hydrogen-bond network; reducing RH from 95% to 85% sharply decreases hydroxide conductivity and photoswitch ratio.

Caveat: Humidity-series conductivities are figure-only estimates from SI plots, not tabulated values.

p005 · Results · Figure 4c · Linked to 1 structured result

Transport MechanismSupport assessment: Medium

Hydroxide-ion transport in NH2-UiO-66-10-OH is proposed to follow a Grotthuss-like mechanism through hydrogen-bonded water networks in the nanopores.

Caveat: Mechanism is inferred from activation energy, CO2 uptake, humidity dependence, and literature analogy rather than direct hydroxide-motion observation.

p003-p004 · Results · Figure 2c-d · Linked to 2 structured results

Transport MechanismSupport assessment: High

Visible-light absorption by amino-functionalised NH2-UiO-66 produces local photothermal heating, removes pore water, disrupts the hydrogen-bonded hydroxide-transport pathway, and lowers conductivity; turning the light off restores water and conductivity.

Caveat: Local internal temperature is not directly measured; authors state it is higher than measured surface/powder temperature.

p005 · Results · Scheme 1 · Linked to 5 structured results

Material identities

Names and aliases are kept exactly within the paper’s own identity model.

MaterialCompositionStructure contextSource
NH2-UiO-66Zr-based UiO-66 framework with 2-amino-terephthalate linkers; exact formula not reportedZr4+ oxo clusters · 2-amino-terephthalic acid / 2-aminoterephthalate (H2ATA-derived)3D · PristineUiO-66-derived cubic close packed nanoporous framework with reported 1 nm nanopores and 0.6 nm triangular windows.p001-p002 · Introduction; Result and Discussion
UiO-66Zr-based UiO-66 framework with terephthalate linkers; exact formula not reportedZr4+ oxo clusters · terephthalic acid / terephthalate (H2BDC-derived)3D · PristineUiO-66 framework used as non-amino control for light absorption comparison.p003-p006 · Results and Methods · Figure 2a

Sample register

Sample form, processing state and composition status define the context for measurements.

Show 12 sample records
SampleForm and roleProcessing and geometrySource
NH2-UiO-66-0-OHresearch_0516__mat__nh2_uio66Pellet · Target Sample · Guest LoadedPressed at 20 MPa for 10 s, Ag electrodes evaporated, immersed in 1 mM KOH for 24 h, equilibrated at controlled temperature/humidity for 2 h.silver electrodes evaporated onto pressed pellet · 100 um thickness; 3 mm width; 300 um transport distancep006 · Methods - Hydroxide Ion Conductivity Measurement · Figure 3a
NH2-UiO-66-0research_0516__mat__nh2_uio66Powder · Target Sample · Pristine FrameworkSolvothermal powder made with 0 equiv acetic acid modulator.p002 · Result and Discussion · Figure 4a
NH2-UiO-66-100-OHresearch_0516__mat__nh2_uio66Pellet · Target Sample · Guest LoadedPressed at 20 MPa for 10 s, Ag electrodes evaporated, immersed in 1 mM KOH for 24 h, equilibrated at controlled temperature/humidity for 2 h.silver electrodes evaporated onto pressed pellet · 100 um thickness; 3 mm width; 300 um transport distancep004 · Results · Figure 3d
NH2-UiO-66-100research_0516__mat__nh2_uio66Powder · Target Sample · Pristine FrameworkSolvothermal powder made with 100 equiv acetic acid modulator.p004 · Result and Discussion · Figure 3d
activated NH2-UiO-66-10research_0516__mat__nh2_uio66Powder · Target Sample · Pristine FrameworkActivated powder used for SI TG curve after activation; exact activation protocol not reported in supplied documents.p005 · Additional figures · Figure S5
fully hydrated NH2-UiO-66-10research_0516__mat__nh2_uio66Powder · Target Sample · Guest LoadedFully hydrated powder used for TGA water-loss analysis.p005 · Results · Figure 5c
NH2-UiO-66-10-OHresearch_0516__mat__nh2_uio66Pellet · Target Sample · Guest LoadedPressed at 20 MPa for 10 s, Ag electrodes evaporated, immersed in 1 mM KOH for 24 h, equilibrated at controlled temperature/humidity for 2 h.silver electrodes evaporated onto pressed pellet · 100 um thickness; 3 mm width; 300 um transport distancep005-p006 · Results; Methods · Figures 4b-c, 5a-b
NH2-UiO-66-10research_0516__mat__nh2_uio66Powder · Target Sample · Pristine FrameworkSolvothermal powder made with 10 equiv acetic acid modulator.p002-p003 · Result and Discussion · Figures 1a, 2a-c
activated NH2-UiO-66-50research_0516__mat__nh2_uio66Powder · Target Sample · Pristine FrameworkActivated powder used for SI TG curve after activation; exact activation protocol not reported in supplied documents.p005 · Additional figures · Figure S5
NH2-UiO-66-50-OHresearch_0516__mat__nh2_uio66Pellet · Target Sample · Guest LoadedPressed at 20 MPa for 10 s, Ag electrodes evaporated, immersed in 1 mM KOH for 24 h, equilibrated at controlled temperature/humidity for 2 h.silver electrodes evaporated onto pressed pellet · 100 um thickness; 3 mm width; 300 um transport distancep004-p005 · Results · Figures 3c, 4b-c
NH2-UiO-66-50research_0516__mat__nh2_uio66Powder · Target Sample · Pristine FrameworkSolvothermal powder made with 50 equiv acetic acid modulator.p002 · Result and Discussion · Figure 1b-d
UiO-66 powderresearch_0516__mat__uio66_controlPowder · Pristine Control · Pristine FrameworkSynthesised by the same method as NH2-UiO-66 with H2BDC substituted for H2ATA.p006 · Methods - Synthesis of NH2-UiO-66 and UiO-66 Powders