| Initial letter | Keywords | Count |
|---|
| 0-9 | 3D printing (2), 3D bioprinting (2), 3D printability (1), 3DIC (1), 13C labeling (1), 3D Convolutional Neural Network (3D CNN) (1), etc. | 11 |  |
|---|
| A | adsorption (10), Active matter (4), absorption (3), Ammonia Cracking (3), AI (3), alkaline water electrolysis (3), etc. | 163 | |
|---|
| B | Biomass (6), Bubble rise motion (2), Bioethanol (2), Biopharmaceuticals (2), Biodegradable polymer (2), Bioprinting (1), etc. | 92 | |
|---|
| C-CH | Catalyst (11), Carbon dioxide (8), CFD (8), carbon nanotube (4), Carbon capture (3), CCU (3), etc. | 157 | |
|---|
| CI-CZ | CO2 capture (11), Crystallization (11), CO2 electrolysis (6), CO2 (3), coating (3), CO2 absorption (3), etc. | 187 | |
|---|
| D | Deep eutectic solvent (12), direct air capture (8), drying (6), Drop-in fuel (5), degradation (4), Drug delivery system (3), etc. | 150 | |
|---|
| E | emulsion (8), extraction (6), Electrolysis (4), electrocatalyst (4), electrodialysis (4), encapsulation (3), etc. | 133 | |
|---|
| F | Fluidized bed (4), Fine Bubble (4), Flame Spray Pyrolysis (4), fuel cell (4), Freezing (3), Fischer-Tropsch synthesis (3), etc. | 121 | |
|---|
| G | Gold (4), Gasification (4), gel (3), gas separation (3), Gas sensor (3), Gold Nanoparticles (3), etc. | 81 | |
|---|
| H | Hydrogen production (16), Hydrogen (7), hydrogel (7), HSP (3), Hydrogen evolution reaction (3), Hydrolysis (3), etc. | 140 | |
|---|
| I | Interfacial polymerization (10), Ionic liquid (6), Interface (4), Image Analysis (2), ionic liquid membrane (2), Independent Protection Layer (2), etc. | 96 | |
|---|
| J | Janus particle (2), jam (1), Japanese Traditional Company (1) | 4 | |
|---|
| K | Kinetics (2), K promotion (1), kinetic model (1), Komagataella phaffii (1), Kinetic Analysis (1), Kinetic analysis of hydrodefluorination (1), etc. | 7 | |
|---|
| L | liposome (4), Lithium-Ion Battery (4), Liquid Crystal (3), LLM (3), liquid-liquid phase separation (3), lipid assembly (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), Microwave heating (3), Microcapsule (3), etc. | 114 | |
|---|
| N | numerical simulation (5), Nanoparticle (3), Nickel (3), Ni catalyst (3), Nanoparticles (3), nanofiber (3), etc. | 81 | |
|---|
| Non alphanumeric | * (3) | 3 | |
|---|
| O | organic solvent reverse osmosis (5), Organic solvent nanofiltration (5), Organic solvent (2), Organosilica membrane (2), Optical measurement (2), Optimization (2), etc. | 65 | |
|---|
| P-PH | Peptide (8), PFAS (7), Photocatalyst (6), pervaporation (4), Phase Equilibria (3), Phase change material (3), etc. | 115 | |
|---|
| PI-PZ | process simulation (6), polymer electrolyte fuel cell (5), Polyamide membrane (5), Plant oil deoxygenation (5), pyrolysis (4), process design (4), etc. | 182 | |
|---|
| Q | QCM (2), quartz crystal microbalance (2), Quality management (1), Quantitative Evaluation (1), Quantum Sieving (1), Quincke Roller (1), etc. | 9 | |
|---|
| R | recycling (4), rheology (3), Rare earth (2), Renewable energy (2), Redox (2), Reverse osmosis (2), etc. | 73 | |
|---|
| S-SO | simulation (7), self-assembly (6), Separation (4), silica (4), Solid Catalyst (3), Solvent extraction (3), etc. | 136 | |
|---|
| SP-SZ | surfactant (7), Startup (6), supercritical carbon dioxide (4), Structured catalyst (4), Surface modification (4), supercritical water (4), etc. | 134 | |
|---|
| T | thermal conductivity (3), Transfer learning (3), transdermal delivery (3), Taylor-Couette Flow (3), Thermodynamic Properties (2), Thermal Energy Storage (2), etc. | 73 | |
|---|
| U | Upcycling (5), Ultrafine Bubble (4), Ultrasound (2), UiO-66 (2), Ultrasonic process (1), upcycling technology (1), etc. | 29 | |
|---|
| V | Viscosity (6), Viscoelastic fluid (4), Value Chain (2), Vapor-liquid equilibria (2), Viscoelasticity (2), VOF method (1), etc. | 37 | |
|---|
| W | Woody biomass (8), Water electrolysis (4), Waste plastics (3), Water Treatment (2), Water electrolyzer (2), Water Treatment System (1), etc. | 42 | |
|---|
| X | X-ray CT (1), X-type zeolite membrane (1), XPS analysis (1) | 3 | |
|---|
| Y | YSZ (1), Yeast promoter engineering (1) | 2 | |
|---|
| Z | zeolite (10), zwitterionic polymer (2), zeolite membrane (1), Zeta potential (1), ZnO nanorods (1), Zr-MFI (1), etc. | 30 | |
|---|
