| Initial letter | Keywords | Count |
|---|
| 0-9 | 3D bioprinting (2), 3D printing (2), 13C labeling (1), 3D printability (1), 3D Convolutional Neural Network (3D CNN) (1), 3D protein immobilization (1), etc. | 11 |  |
|---|
| A | adsorption (10), Active matter (4), Air separation (3), Amine (3), ammonia cracking (3), Alkaline water electrolysis (3), etc. | 163 | |
|---|
| B | Biomass (6), Biopharmaceuticals (2), Bubble rise motion (2), Biodegradable polymer (2), Bioethanol (2), Balance of plant (1), etc. | 92 | |
|---|
| C-CH | Catalyst (11), Carbon dioxide (8), CFD (8), carbon nanotube (4), Cellulose (3), Carbon capture (3), etc. | 157 | |
|---|
| CI-CZ | CO2 Capture (11), Crystallization (11), CO2 electrolysis (6), CO2 absorption (3), CO2 (3), coating (3), etc. | 187 | |
|---|
| D | deep eutectic solvent (12), direct air capture (8), Drying (6), Drop-in fuel (5), Degradation (4), Distillation (3), etc. | 150 | |
|---|
| E | emulsion (8), Extraction (6), Electrodialysis (4), electrocatalyst (4), Electrolysis (4), Enzyme (3), etc. | 133 | |
|---|
| F | Fuel Cell (4), Fine Bubble (4), Fluidized bed (4), Flame spray pyrolysis (4), Fischer-Tropsch Synthesis (3), freezing (3), etc. | 121 | |
|---|
| G | Gold (4), Gasification (4), Gas separation (3), Gold nanoparticles (3), gold nanoparticle (3), Gas sensor (3), etc. | 81 | |
|---|
| H | Hydrogen production (16), Hydrogen (7), Hydrogel (7), Hydrolysis (3), Hydrogenation (3), HSP (3), etc. | 140 | |
|---|
| I | Interfacial polymerization (10), ionic liquid (6), Interface (4), Image Analysis (2), In-situ observation (2), Independent Protection Layer (2), etc. | 96 | |
|---|
| J | Janus particle (2), jam (1), Japanese Traditional Company (1) | 4 | |
|---|
| K | kinetics (2), Kinetic analysis of hydrodefluorination (1), K promotion (1), kinetic model (1), Komagataella phaffii (1), Kinetic Analysis (1), etc. | 7 | |
|---|
| L | Lithium-Ion Battery (4), Liposome (4), Liquid-Liquid Phase Separation (3), LLM (3), lipid assembly (3), Liquid Crystal (3), etc. | 97 | |
|---|
| M-MH | Machine learning (31), Metal-Organic Frameworks (15), Methanation (8), metal-organic framework (6), membrane (6), Membrane Separation (4), etc. | 166 | |
|---|
| MI-MZ | mixing (9), MOF (5), molecular dynamics (4), Microwave (4), Microcapsule (3), microwave heating (3), etc. | 114 | |
|---|
| N | Numerical simulation (5), nanoparticles (3), nanoparticle (3), nanofiber (3), Ni catalyst (3), Nickel (3), etc. | 81 | |
|---|
| Non alphanumeric | * (3) | 3 | |
|---|
| O | Organic solvent nanofiltration (5), Organic solvent reverse osmosis (5), Oxidation (2), Oxygen-enriched air (2), Organic solvent (2), Oxygen evolution reaction (2), etc. | 65 | |
|---|
| P-PH | Peptide (8), PFAS (7), Photocatalyst (6), pervaporation (4), PEM Water Electrolysis (3), Phase Change Material (3), etc. | 115 | |
|---|
| PI-PZ | process simulation (6), Plant oil deoxygenation (5), polymer electrolyte fuel cell (5), Polyamide membrane (5), Pyrolysis (4), Protein (4), etc. | 182 | |
|---|
| Q | quartz crystal microbalance (2), QCM (2), quality (1), Quantitative Evaluation (1), Quality management (1), Quincke Roller (1), etc. | 9 | |
|---|
| R | recycling (4), rheology (3), Redox (2), rare earth (2), Renewable energy (2), Reverse osmosis (2), etc. | 73 | |
|---|
| S-SO | simulation (7), Self-assembly (6), Silica (4), Separation (4), solid oxide fuel cell (3), Solvent extraction (3), etc. | 136 | |
|---|
| SP-SZ | surfactant (7), Startup (6), Surface modification (4), Structured catalyst (4), Supercritical carbon dioxide (4), supercritical water (4), etc. | 134 | |
|---|
| T | Thermal conductivity (3), transfer learning (3), transdermal delivery (3), Taylor-Couette Flow (3), thermal plasma (2), Temperature-responsive polymer (2), etc. | 73 | |
|---|
| U | Upcycling (5), Ultrafine Bubble (4), Ultrasound (2), UiO-66 (2), UV-Curable Resins (1), Ultraviolet Irradiation (1), etc. | 29 | |
|---|
| V | Viscosity (6), Viscoelastic fluid (4), Viscoelasticity (2), Value Chain (2), Vapor-liquid equilibria (2), Value delivery (1), etc. | 37 | |
|---|
| W | Woody biomass (8), Water electrolysis (4), Waste plastics (3), Water electrolyzer (2), Water treatment (2), Wafer drying (1), etc. | 42 | |
|---|
| X | X-ray CT (1), XPS analysis (1), X-type zeolite membrane (1) | 3 | |
|---|
| Y | YSZ (1), Yeast promoter engineering (1) | 2 | |
|---|
| Z | zeolite (10), Zwitterionic Polymer (2), zeolite membrane (1), ZSM-5 (1), ZnO nanorods (1), Zwitterion (1), etc. | 30 | |
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