In this work, 3-D and two-phase nanofluid flow and heat transfer is modeled over a stretching infinite solar plate. The governing equations are presented based on previous studies. The infinite boundary condition and shortcoming of traditional analytical collocation method have been overcome in our study by changing the problem into a finite boundary problem with a new analytical method called opti- mal collocation method. The accuracy of results is examined by fourth order Run- ge-Kutta numerical method. Effect of some parameters, Prandtl number, Schmidt number, Brownian motion parameter, thermophoresis parameter, λ=b/a (ratio of the stretching rate along y- to x-directions), and power-law index on the veloci- ties, temperature and nanoparticles concentration functions are discussed. As an important outcome of our 3-D model analysis, it is found that increase in thermo- phoretic forces can enhance the thickness of both thermal and nanoparticle volume fraction boundary-layers.

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