where x is the instantaneous distance, ϵ = k B T = 1/β and λ is the parameter controlling the hydrophobicity. Further details are provided in Sec. S1.1 of the ESI, where we also plot the potential in Figure and relate the values of λ to the second virial coefficient, B 2 . 114 We always use the truncated and shifted form 115 of the potential in Eq. 5 with the cutoff of 2.5σ mon = 1.065 nm. Unless stated otherwise, we use λ = 0, yielding a purely repulsive WCA potential which represents good (athermal) solvent conditions.