ATR FTIR is possible to use for liquid samples. It is fast and cheap technique. For good results the concentration of sample in liquid should be high enough. XRD can be used for liquid samples but not all devices allow it (I suppose this will be complicated for yours samples). For TEM sample preparation (including liquid) you can read chapter (see link below). Additionaly, AFM can be used for liquid samples too. Do you really need your samples in liquid? What property you want to study. For liquid samples some other techniques can be used (e.g. already mentioned AFM or DLS).
ATR FTIR is possible to use for liquid samples. It is fast and cheap technique. For good results the concentration of sample in liquid should be high enough. XRD can be used for liquid samples but not all devices allow it (I suppose this will be complicated for yours samples). For TEM sample preparation (including liquid) you can read chapter (see link below). Additionaly, AFM can be used for liquid samples too. Do you really need your samples in liquid? What property you want to study. For liquid samples some other techniques can be used (e.g. already mentioned AFM or DLS).
Sir, in recommendation to Lukas Sir, I would suggest to prepare a thin film by spincoating your liquid sample or drop casting on to any conducive substrate for XRD. For TEM, your liquid sample can easily be coated on copper grid. And for FTIR, you can go for ATR assembly, if not then you can drop casting your liquid sample onto KBr pellet and dry it well and record IR.