Goud op de vlucht!
Hoe een chemisch huisje elk nanodeeltje bewaart
Je hebt een gouden ring en besluit deze schoon te maken. Je pakt een doek en wrijft voorzichtig over het oppervlak. Maar hoe langer je wrijft, hoe meer het lijkt alsof de ring zelf steeds kleiner wordt. Het goud verdwijnt langzaam, alsof het oplost in de lucht. Je blijft poetsen, maar voor je het weet is de ring bijna helemaal verdwenen, terwijl je dacht dat je alleen het vuil zou verwijderen. Zo voelt het ook als ik goudnanodeeltjes probeer te zuiveren. Frustrerend? Zeker, want bij zulke kleine hoeveelheden telt elk deeltje. Op sommige dagen voelde ik me dan ook meer goudzoeker dan onderzoeker. Toch is het belangrijk dat we dit ogenschijnlijk ongrijpbare probleem aanpakken, want goudnanodeeltjes zijn onmisbaar in toepassingen zoals de ondertussen befaamde COVID-sneltest.
Wie niet weg is, is gezien!
En dat is niet alleen frustrerend, het is ook zonde. Goud is duur, moeilijk te delven en tegelijk onmisbaar in allerlei technologische toepassingen. Hoewel het officieel geen kritiek materiaal is, stijgt de vraag sterk en laat de ontginning wereldwijd diepe ecologische sporen na. In een wereld waar elk microgram telt, is verspilling vermijden dus essentieel, zelfs op laboschaal.
Dat geldt des te meer wanneer je werkt met goudnanodeeltjes: minuscule deeltjes, duizenden keren kleiner dan een zandkorrel. Op die schaal krijgt goud verrassende eigenschappen. Net zoals bladeren groen lijken omdat ze rood en blauw licht absorberen en groen licht verstrooien, danken goudnanodeeltjes hun opvallende kleur aan de manier waarop ze licht absorberen en verstrooien.
Goud is onmisbaar vandaag de dag.
Afhankelijk van hun grootte, vorm en omgeving verschijnen ze rood, paars of zelfs blauw. Die optische gevoeligheid maakt ze bijzonder nuttig in allerlei applicaties: van zwangerschapstesten en milieusensoren tot licht-gedreven chemie en elektronenmicroscopie. Een bekender voorbeeld zijn de COVID-sneltesten. De goudnanodeeltjes zorgen daar voor de rode kleur die verschijnt als de test positief is. En precies daarin schuilt de kracht van deze nanodeeltjes: wie niet weg is, is gezien! Dankzij hun interactie met licht vallen ze op, en kunnen ze schitteren in talloze toepassingen.
Wie draait, die verliest
Bij het synthetiseren van goudnanodeeltjes worden de nanodeeltjes rechtstreeks gevormd in water. Deze deeltjes zijn zo klein dat ze in de vloeistof blijven zweven. Zo’n stabiel systeem van vaste deeltjes in een vloeistof wordt een suspensie genoemd. Na de synthese blijven echter altijd onzuiverheden achter, zoals overtollige chemicaliën of stabilisatoren. Die wil je eruit halen, zodat je met een zuivere suspensie verder kunt. Maar hoe doe je dat, zonder ook je goud kwijt te raken? Meestal gebeurt dat via centrifugeren (klassieke methode). Buisjes gevuld met de goudsuspensie worden daarbij razendsnel rondgedraaid, een beetje zoals in een draaimolen. De zwaardere gouddeeltjes zakken naar de bodem en vormen een poeder. De onzuiverheden blijven in de vloeistof erboven. Die giet je weg en vervang je door proper water. Zo houd je enkel de zuivere goudnanodeeltjes over. Het lijkt eenvoudig, maar tot wel 80% van de goudnanodeeltjes lijkt te verdwijnen. Ze klonteren samen en verliezen zo hun nuttige eigenschappen, of bezinken niet goed en spoelen met de afvalvloeistof weg. In beide gevallen gaan ze verloren. Elke zuiveringsstap wordt zo een delicate evenwichtsoefening: zuiver je niet grondig genoeg, dan hou je vervuiling over; ga je té grondig te werk, dan ben je je goud kwijt. Voor dit probleem heb ik in mijn thesis een oplossing ontwikkeld.
Een spons met superkrachten
Die oplossing vond ik in een bijzonder materiaal met een nog meer bijzondere naam: zeolitic imidazolate framework-8, kortweg ZIF-8. Klinkt ingewikkeld, maar het idee erachter is verrassend eenvoudig. ZIF-8 is een soort chemisch bouwpakket met veel open ruimte binnenin. Je kan het je voorstellen als een spons op nanoschaal, met een netwerk van kleine holtes en gangen waarin je dingen kan opsluiten. In mijn geval: goudnanodeeltjes.
In plaats van de nanodeeltjes zomaar als suspensie te proberen zuiveren, bouw je er tijdelijk een huisje omheen. Je integreert de goudnanodeeltjes in ZIF-8, zodat ze tijdens het centrifugeren niet samenklonteren of aan de wand van de buisjes blijven kleven. Daarna droog je het gevormde goudnanodeeltje-in-ZIF-8 materiaal tot een poeder. Zo’n poeder is veel makkelijker te hanteren en te vervoeren dan een delicate goudnanodeeltjessuspensie. Wanneer je de goudnanodeeltjes weer nodig hebt, weeg je een gewenste hoeveelheid poeder af, los je het op in water en voeg je een beetje zuur toe. ZIF-8 is namelijk gevoelig voor zuur: het valt uiteen en laat de nanodeeltjes netjes los.
De echte kracht zit volgens mij in de eenvoud en flexibiliteit van deze aanpak.
Die aanpak werkte verrassend goed. Niet alleen bleef tot 80% van het goud behouden na meerdere wasbeurten, ook de goudnanodeeltjes kwamen nadien netjes weer vrij, zonder te klonteren. Zelfs na bewaren van het poeder voor 5 maanden, bleef de stabiliteit bewaard en verkregen we weer een mooie rode suspensie na het vrijzetten van de goudnanodeeltjes met behulp van zuur. Dit is een grote vooruitgang ten opzichte van suspensies die vaak eerder een beperkte houdbaarheid vertonen. De echte kracht zit volgens mij in de eenvoud en flexibiliteit van deze aanpak. Je hebt geen dure apparatuur nodig, geen complexe chemie, en je kan het proces eenvoudig opschalen.
Van goudzoeker tot vinder
Wat begon als een strijd tegen verdwijnend goud, werd een doorbraak. Met een slim chemisch huisje dat de nanodeeltjes tijdelijk opsluit, kunnen we goud bewaren tot we het nodig hebben en zo tot vier keer minder verliezen dan bij klassieke zuiveringsmethoden. Deze eenvoudige ingreep maakt het werken met goudnanodeeltjes niet alleen preciezer en zuiniger, maar ook toegankelijker voor anderen. Geen klonterende of verdwenen nanodeeltjes meer, wel een stabiel en doseerbaar poeder dat je op elk moment kunt activeren. Dit is meer dan een handige truc: het zou de manier waarop we met goudnanodeeltjes omgaan in het laboratorium voorgoed kunnen veranderen.
Waar ooit het gevoel van een goudzoeker overheerste, eindigt dit werk met een slimme en elegante oplossing om goud gecontroleerd te bewaren, zuiveren en recupereren. Zo zijn de goudnanodeeltjes niet langer ongrijpbaar, maar een betrouwbare partner in onderzoek en toepassingen.
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